CN202532795U - Spanning type outer auxiliary heating anti-defrosting device - Google Patents
Spanning type outer auxiliary heating anti-defrosting device Download PDFInfo
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Abstract
本实用新型公开了一种跨越式外辅热防融霜装置，包括连接于节流阀或毛细管(9)与低温换热侧(3)之间的第一制冷剂管(6)以及连接于压缩机(1)和与低温换热侧(3)之间的第二制冷剂管(13)，在所述的第一制冷剂管(6)和第二制冷剂管(13)的外表面均包覆有加热装置。本实用新型是一种系统防融霜且为制冷剂过热，降低压缩比，提高系统性能，无需停机、操作简单且不用改变工质流量、融霜时间短、预热快、效率高、耗能少的跨越式外辅热防融霜装置。
The utility model discloses a leap-type external auxiliary heat anti-defrosting device, which comprises a first refrigerant pipe (6) connected between a throttle valve or capillary (9) and a low-temperature heat exchange side (3) and a first refrigerant pipe (6) connected to a The second refrigerant pipe (13) between the compressor (1) and the low-temperature heat exchange side (3), on the outer surface of the first refrigerant pipe (6) and the second refrigerant pipe (13) All are covered with a heating device. The utility model is a kind of anti-defrosting system and overheating of the refrigerant, reduces the compression ratio, improves the system performance, does not need to be shut down, is simple to operate and does not need to change the flow rate of the working fluid, has short defrosting time, fast preheating, high efficiency and low energy consumption. Few leap-type external auxiliary heat anti-defrosting devices.
Description
技术领域 technical field
本实用新型涉及一种防融霜装置，特别涉及一种通过前置于蒸发器前和压缩机前的外辅热技术进行防融霜以及为制冷剂过热，从而降低压缩比，提高系统性能的装置。The utility model relates to an anti-defrosting device, in particular to an anti-defrosting and overheating refrigerant through the external auxiliary heating technology placed in front of the evaporator and compressor, thereby reducing the compression ratio and improving the system performance. device.
背景技术 Background technique
长江中下游地区属于热工气候分区中的夏热冬冷地区，冬季平均温度低，相对湿度大。而且在受北方强冷空气的影响下，冬季会出现一定时间的霜冻或冰冻天气。高湿度的环境条件是这一地区的特点，也是造成热泵结霜严重和工作性能差的主要原因。空气源热泵在这种环境下工作时蒸发器极易结霜，系统工作性能衰减严重，随时间推移，生长成的霜层导致换热过程恶化，使得机组的蒸发温度降低。此时，由于大量液态制冷剂没有及时蒸发，回液过多增加了压缩机液击的可能性。并且因为频繁的传统的除霜方式使机组处于不稳定的工作状态，供热效果和供热时间都不能保证。The middle and lower reaches of the Yangtze River belong to the hot summer and cold winter region in the thermal climate division, with low average temperature and high relative humidity in winter. And under the influence of the strong cold air in the north, there will be frost or freezing weather for a certain period of time in winter. The ambient conditions of high humidity are characteristic of this region and are the main cause of severe frosting and poor performance of heat pumps. When the air source heat pump works in this environment, the evaporator is very easy to frost, and the system performance is seriously attenuated. As time goes by, the frost layer formed will deteriorate the heat exchange process and reduce the evaporation temperature of the unit. At this time, because a large amount of liquid refrigerant does not evaporate in time, excessive liquid return increases the possibility of compressor liquid shock. And because the frequent traditional defrosting method makes the unit in an unstable working state, the heating effect and heating time cannot be guaranteed.
传统的除霜方法是将室内机的风机停机，并将四通换向阀进行切换，空调系统按照制冷方式运行。这时室外换热器转换为制冷工况下的冷凝器来用。这种除霜方式存在以下缺点：由于室内机的风机停机，室内换热器从室内环境吸热量很少，除霜相对不足，使得除霜时间过长；由于室内风扇停转，室内机在除霜时室内换热器需从室内环境中吸取热量，使得室温将下降，使室内环境更加恶劣。由于除霜时间过长，室外换热器上部的融霜会掉到下部翅片上，下面霜层积累很多，难以除掉，造成冰层堆积，影响换热器效率。另外一种热气旁通阀除霜是由热气旁通阀将高温高压排气由压缩机排气口引向蒸发器，通过高温高压冷媒液化放热来除霜。由于高压侧的冷媒的热量还是来自于蒸发器吸收的热量，当气温较低，除霜持续时间长，将没有足够热量吸收，使主机进入保护性停机状态。常见的电热融霜装置是使用电热元件作融霜热源的，通常，按照电热元件布置部位不同，可以再分为三种类型：(1)把电加热器直接放置在换热器的表面端部；(2)把电加热器与换热器做成一体；(3)把电热管放在蒸发器内的制冷剂管中。对于前两种，由于电热元件暴露在潮湿空气中，为了保证潮湿空气即冰层不被击穿造成机组漏电的现象。通常流过电热元件的电流并不大。当化霜所需要的能量一定时，电流越小，对于已给的电热融霜装置，其所需要的化霜时间越长。第三种将电热元件内置于蒸发器内的制冷剂管中，由于不再受制于安全电流，融霜速率得到提升。但是，与前两种电热除霜方式相比，电热管套在换热肋片管中，不仅仅要求电热管具有更好的稳定性，同时也增加了设备制造成本和制造及检修的难度。此外，国内空调设备生产厂家目前使用的单位时间继电器构成的简单融霜控制器，其融霜时间为设定值，不能根据结霜量的多少进行调节，如果时间继电器出线故障，电热管长时间工作，会烧坏空调设备。The traditional defrosting method is to stop the fan of the indoor unit, switch the four-way reversing valve, and the air conditioning system operates in a cooling mode. At this time, the outdoor heat exchanger is converted into a condenser under cooling conditions. This defrosting method has the following disadvantages: because the fan of the indoor unit stops, the indoor heat exchanger absorbs little heat from the indoor environment, and the defrosting is relatively insufficient, which makes the defrosting time too long; When defrosting, the indoor heat exchanger needs to absorb heat from the indoor environment, so that the room temperature will drop, making the indoor environment worse. Because the defrosting time is too long, the defrosting on the upper part of the outdoor heat exchanger will fall to the lower fins, and the frost layer below will accumulate a lot, which is difficult to remove, resulting in ice accumulation and affecting the efficiency of the heat exchanger. Another kind of hot gas bypass valve defrosting is that the hot gas bypass valve guides the high-temperature and high-pressure exhaust gas from the compressor exhaust port to the evaporator, and defrosts through the high-temperature and high-pressure refrigerant liquefaction and heat release. Since the heat of the refrigerant on the high-pressure side still comes from the heat absorbed by the evaporator, when the temperature is low and the defrosting lasts for a long time, there will not be enough heat absorbed, and the host will enter a protective shutdown state. Common electric heating defrosting devices use electric heating elements as the heat source for defrosting. Usually, according to the location of the electric heating elements, they can be further divided into three types: (1) The electric heater is placed directly on the surface end of the heat exchanger ; (2) The electric heater is integrated with the heat exchanger; (3) The electric heating tube is placed in the refrigerant tube in the evaporator. For the first two types, since the heating element is exposed to humid air, in order to ensure that the humid air, that is, the ice layer, is not broken down, the unit will leak electricity. Usually the current flowing through the heating element is not large. When the energy needed for defrosting is constant, the smaller the current is, the longer the defrosting time is for the given electric heating defrosting device. The third type has the electric heating element built into the refrigerant tube in the evaporator, and since it is no longer subject to the safety current, the defrosting rate is improved. However, compared with the first two electric heating defrosting methods, the electric heating tube is set in the heat exchange fin tube, which not only requires the electric heating tube to have better stability, but also increases the equipment manufacturing cost and the difficulty of manufacturing and maintenance. In addition, domestic air-conditioning equipment manufacturers currently use simple defrosting controllers composed of unit time relays. The defrosting time is a set value and cannot be adjusted according to the amount of frosting. work, it will burn out the air conditioner.
回液过多容易增加液击的可能性。利用热气旁通阀融霜的系统容易发生回液。无论采用四通阀进行制冷运行，还是采用热气旁通阀融霜时的热泵运行，热气融霜后会在蒸发器内形成大量液体，这些液体在随后的制冷运行开始时既有可能回到压缩机。此外，蒸发器结霜严重或风扇故障时传热变差，未蒸发的液体会引起回液。室内温度频繁波动也会引起膨胀阀反应失灵而引起回液。回液引起的液击事故大多发生在空气冷却型(简称风冷或空冷)半封闭压缩机和单机双级压缩机中，因为这些压缩机的气缸与回气管是直接相通的，一旦回液，就很容易引发液击事故。即使没有引起液击，回液进入汽缸将稀释或冲刷掉活塞及汽缸壁上的润滑油，加剧活塞磨损。回液过多而增加液击的可能性一般通过过热方法解决。传统的过热方法有回热循环和调节制冷剂灌注量或通过调节毛细管的长短来调节制冷剂流量。采用回热循环后，自蒸发器出来的气体流过回热器时压力有所降低，因而增大了压缩机的压比，引起压缩功的增大。另一种是调节制冷剂的灌注量或通过调节毛细管的长短来调节制冷剂流量，这种方法虽然会使过热度不致太大，压缩终温不致过高而损坏压缩机，但会因制冷剂的流量变化而影响蒸发和冷凝的效果。Excessive liquid return easily increases the possibility of liquid hammer. Systems that utilize the hot gas bypass valve to defrost are prone to floodback. Regardless of using a four-way valve for cooling operation, or using a hot gas bypass valve for heat pump operation during defrost, hot gas defrosts will form a large amount of liquid in the evaporator, which may return to compression when the subsequent cooling operation starts machine. In addition, when the evaporator is severely frosted or the heat transfer becomes poor when the fan fails, the unevaporated liquid will cause liquid return. Frequent fluctuations in the indoor temperature will also cause the response failure of the expansion valve and cause liquid return. Most of the liquid hammer accidents caused by liquid return occur in air-cooled (referred to as air-cooled or air-cooled) semi-hermetic compressors and single-unit two-stage compressors, because the cylinders of these compressors are directly connected to the return pipe. Once liquid returns, It is easy to cause a liquid hammer accident. Even if no slugging is caused, liquid back into the cylinder will dilute or wash away the lubricating oil on the piston and cylinder wall, increasing piston wear. The possibility of increasing liquid hammer due to excessive liquid return is generally solved by overheating. The traditional superheating methods include heat recovery cycle and adjusting the amount of refrigerant injection or adjusting the refrigerant flow rate by adjusting the length of the capillary. After the regenerative cycle is adopted, the pressure of the gas from the evaporator flows through the regenerator is reduced, thus increasing the pressure ratio of the compressor and causing an increase in the compression work. The other is to adjust the filling amount of the refrigerant or adjust the refrigerant flow rate by adjusting the length of the capillary tube. Although this method will prevent the superheat from being too high and the final compression temperature from being too high to damage the compressor, it will cause damage to the compressor due to the refrigerant The change of the flow rate affects the effect of evaporation and condensation.
实用新型内容 Utility model content
本实用新型所要解决的技术问题是提供一种系统除霜无需停机并对工质进行过热无需改变工质流量的跨越式外辅热防融霜装置。The technical problem to be solved by the utility model is to provide a leap-type external auxiliary heat anti-defrosting device that does not need to stop the system for defrosting and overheats the working medium without changing the flow of the working medium.
为了解决上述技术问题，本实用新型提供的跨越式外辅热防融霜装置，包括连接于节流阀或毛细管与低温换热侧之间的第一制冷剂管以及连接于压缩机和与低温换热侧之间的第二制冷剂管，在所述的第一制冷剂管和第二制冷剂管的外表面均包覆有加热装置。In order to solve the above technical problems, the utility model provides a leap-type external auxiliary heat anti-defrosting device, which includes a first refrigerant tube connected between the throttle valve or capillary tube and the low-temperature heat exchange side and connected to the compressor and the low-temperature The second refrigerant pipe between the heat exchange sides is coated with a heating device on the outer surfaces of the first refrigerant pipe and the second refrigerant pipe.
所述的加热装置为包覆在所述的第一制冷剂管或第二制冷剂管的外表面上的电热元件和包覆在所述的电热元件的外表面的隔热膜。The heating device is an electric heating element coated on the outer surface of the first refrigerant pipe or the second refrigerant pipe and a thermal insulation film coated on the outer surface of the electric heating element.
所述的加热装置为热水、热油或热气换热器。The heating device is a hot water, hot oil or hot gas heat exchanger.
采用上述技术方案的跨越式外辅热防融霜装置，利用电-热转换原理，将一定电压、一定电流的电热管包在连接于毛细管或膨胀阀和低温换热侧之间的制冷剂管外以及连接于低温换热侧与压缩机的制冷剂管外面，相当于电热毯式的形式包在制冷剂管外面，或采用热水、热油或热气换热器与连接于毛细管或膨胀阀和低温换热侧之间的制冷剂管换热，然后再加上隔热膜降低能量损耗。系统除霜、过热工质无需停机、改变工质流量，无需设置旁通装置，不仅适用于所有的空气源热泵，还包括所有具有辅热加热工质特点的热泵空调装置。The leap-type external auxiliary heat anti-defrosting device adopts the above-mentioned technical scheme, and uses the principle of electric-thermal conversion to wrap an electric heating tube with a certain voltage and a certain current in the refrigerant tube connected between the capillary tube or the expansion valve and the low-temperature heat exchange side and the outside of the refrigerant tube connected to the low-temperature heat exchange side and the compressor, which is equivalent to an electric blanket wrapping the refrigerant tube, or using a hot water, hot oil or hot gas heat exchanger and connected to a capillary or expansion valve Exchange heat with the refrigerant tube between the low-temperature heat exchange side, and then add heat insulation film to reduce energy loss. There is no need to stop the system for defrosting and overheating the working medium, change the flow of the working medium, and do not need to set up a bypass device. It is not only applicable to all air source heat pumps, but also includes all heat pump air conditioners with the characteristics of auxiliary heating and heating working medium.
本实用新型对空气源热泵提供一种跨越式外辅热防融霜技术，该技术可在不影响常规空调系统夏天制冷、冬天制热的功能下，还可以在冬天制热运行工况、不间断室内供热的前提下，在进入蒸发器前快速地提高工质的能量，使工质具有较高的能量情况下进入蒸发器，防止结霜量的产生，且在进入压缩机前快速地提高工质的能量，在不改变制冷剂流量的情况下使工质具有较高的能量进入压缩机，防止压缩机液击的可能性。并对低温换热侧和压缩机前置外辅热的结构及整个系统的匹配进行设计。本实用新型克服了由于电热元件暴露在潮湿空气中，为了保证潮湿空气即冰层不被击穿造成机组漏电的问题。也克服电热管套在换热肋片管中，不仅要求电热管具有更好的稳定性，同时也增加了设备制造成本和制造及检修的难度的问题。The utility model provides a leap-forward external auxiliary heat anti-defrosting technology for air source heat pumps. This technology can also be used in winter heating operating conditions without affecting the functions of conventional air conditioning systems in summer cooling and winter heating. Under the premise of intermittent indoor heating, the energy of the working fluid is rapidly increased before entering the evaporator, so that the working fluid enters the evaporator with high energy to prevent the generation of frosting, and the energy of the working fluid is rapidly increased before entering the compressor. Increase the energy of the working fluid, make the working fluid enter the compressor with high energy without changing the flow rate of the refrigerant, and prevent the possibility of compressor liquid shock. And design the structure of the low-temperature heat exchange side and the external auxiliary heat before the compressor and the matching of the whole system. The utility model overcomes the problem of unit leakage caused by electric heating elements being exposed in humid air in order to ensure that the humid air, that is, the ice layer, is not broken down. It also overcomes the problem that the electric heating tube is sheathed in the heat exchange fin tube, which not only requires the electric heating tube to have better stability, but also increases the manufacturing cost of the equipment and the difficulty of manufacturing and maintenance.
综上所述，本实用新型是一种系统防融霜、过热工质降低压缩比，提高系统性能，无需停机、不用改变工质流量且操作简单、融霜时间短、过热快、效率高、耗能少的跨越式外辅热防融霜装置。In summary, the utility model is a system that prevents defrosting, reduces the compression ratio of overheated working fluid, improves system performance, does not need to be shut down, does not need to change the flow rate of the working fluid, and is simple to operate, short defrosting time, fast overheating, high efficiency, A leap-type external auxiliary heating anti-defrosting device with less energy consumption.
附图说明 Description of drawings
图1是本实用新型采用电热元件加热结构示意图。Fig. 1 is a schematic diagram of the heating structure of the utility model using an electric heating element.
图2是本实用新型采用热水、热油或热气加热器结构示意图。Fig. 2 is a structural schematic diagram of the utility model adopting hot water, hot oil or hot gas heater.
具体实施方式 Detailed ways
下面结合附图和具体实施方式对本实用新型作进一步说明。具体实施方式也可参照图1和图2自由组合。Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described. The specific embodiment can also be freely combined with reference to FIG. 1 and FIG. 2 .
本实用新型第一种实施方式在现场按照图1即可完成，结构简单实用。是基于参数霜生长规律的蒸发器电热管辅热除霜空气换热器和基于工质特性过热防止压缩机液击的装置示意图。The first embodiment of the utility model can be completed on site according to Fig. 1, and the structure is simple and practical. It is a schematic diagram of the evaporator electric heating tube auxiliary heat defrosting air heat exchanger based on the parameter frost growth law and the device for preventing compressor liquid hammer from overheating based on the characteristics of the working fluid.
参见图1，压缩机1出口一端经过四通阀2与高温换热侧11相连，一端从压缩机1出口出来后经过四通阀2，四通阀2通过控制阀16、第二制冷剂管13再经过气液分离器17回到压缩机的入口，在第二制冷剂管13的外表面的包覆有第二电热元件12，在第二电热元件12的外表面包覆第二隔热膜14，第二制冷剂管13关联有旁路阀15；高温换热侧11一端与四通换向阀2连通，另一端与干燥过滤器10，与节流阀或毛细管9串联连通；低温换热侧3通过第一制冷剂管6与节流阀或毛细管9串联，另一端与四通阀2入口连接，在第一制冷剂管6的外表面的包覆有第一电热元件8，在第一电热元件8的外表面包覆第一隔热膜5；高温换热侧11可以是水冷也可以是风冷的。Referring to Fig. 1, one end of the
参见图1，当进行正常的制热工况运行时，第一电热元件8、第二电热元件12不工作。当需要除霜时，第一电热元件8通电，当需要过热工质是，第二电热元件12通电。冷凝液经过节流后进入外表面包覆有第一电热元件8的第一制冷剂管6后，制冷剂温度提高，这样可以保证室内机一直处于制热运行工况，不会影响到室内的舒适度。蒸发后的气液混合物通过第二电热元件12过热后，制冷剂温度适当提高，可以保证压缩机高效率的工作。Referring to FIG. 1 , when running under normal heating conditions, the first
参见图1，第一电热元件8、第二电热元件12长度L、隔热膜第一5、第二隔热膜14长度L’、根据融霜补热量、制冷剂特性而确定其长度及大小。Referring to Fig. 1, the length L of the first
图2基本原理同图1，只是在加热装置上有点区别，图2中电热丝换成了第一热水、热油、热气或热管换热器19、第二热水、热油、热气或热管换热器18，此处不为电辅，为其他辅热方式，其包括热水、热油、热气或热管等换热使工质进入蒸发器前具有更高的能量来达到防霜和提高压缩机效率的目的。The basic principle of Fig. 2 is the same as that of Fig. 1, but there is a difference in the heating device. In Fig. 2, the heating wire has been replaced by the first hot water, hot oil, hot gas or heat
在制冷工况下，图1中则使第一电热元件8、第二电热元件12不通电工作，则按原制冷工况运行，即跨越式防融霜装置不启动。图2中则是第一热水、热油、热气或热管换热器19、第二热水、热油、热气或热管换热器18不提供热能，也即跨越式防融霜装置不启动，按原制冷工况运行。改变四通换向阀方向，则图示箭头方向反向，由压缩机1排出的高压蒸汽，经四通阀2进入高温换热侧11，制冷剂蒸汽被冷凝成液体，经节流阀或毛细管9进入低温换热侧3，并在低温换热侧3中吸热，将室内空气冷却，蒸发后的制冷剂蒸汽，经四通阀2后被压缩机1吸入，这样周而复始，实现制冷循环。Under the cooling condition, in Fig. 1, the first
跨越式防融霜装置是相对于制热工况下蒸发器而言，该实用新型成功克服了国内外同类产品所存在的制热流程改造复杂，元器件更换频繁，不利于生产和加工等缺点。本实用新型所涉及的融霜装置目前无工业生产，现有的电辅装置采用加热用户侧所需要的空气或水，而非加热制冷工质，因而效率低；蒸发器内采用电辅技术安装过程复杂，可靠及安全性非常差，无法在工业过程中采用。而热气旁通融霜虽然采用加热制冷剂，但影响了冬天热量的输出，且效果不稳定，用户舒适性差。压缩机前回热增大压缩比，调节制冷剂流量影响蒸发冷凝效果。本实用新型专利采用先进简便的制热流程，元器件改动较少，易于产品的生产和加工，控制可靠性更高；与跨越式内辅热防融霜相比，用户除具有较好的热舒适性或产出热量并是系统更高效的进行，同时外辅热更易实现，控制可靠性更高。可成功预防室外蒸发侧结霜的情况。本实用新型实现了空调、热泵装置制冷制热效果良好，并保证空调、热泵各元器件稳定运行。Compared with the evaporator under the heating condition, the leap-type anti-defrosting device successfully overcomes the shortcomings of the similar products at home and abroad, such as complex heating process transformation, frequent component replacement, and unfavorable production and processing. . The defrosting device involved in the utility model has no industrial production at present, and the existing electric auxiliary device uses the air or water required by the user side instead of heating and cooling working fluid, so the efficiency is low; the evaporator is installed with electric auxiliary technology The process is complicated, the reliability and safety are very poor, and it cannot be adopted in industrial processes. Although hot gas bypass defrosting uses heating refrigerant, it affects the output of heat in winter, and the effect is unstable, and the user comfort is poor. The heat recovery before the compressor increases the compression ratio, and the adjustment of the refrigerant flow rate affects the evaporation and condensation effect. The utility model patent adopts an advanced and simple heating process, less component changes, easy product production and processing, and higher control reliability; Comfort or heat generation is not the result of a more efficient system. At the same time, external auxiliary heating is easier to achieve and the control reliability is higher. It can successfully prevent frosting on the outdoor evaporating side. The utility model realizes that the cooling and heating effect of the air conditioner and the heat pump device is good, and ensures the stable operation of the components of the air conditioner and the heat pump.
本实用新型依据霜生长规律及制冷剂特性不局限于上述最佳实施方式，专利保护段在节流阀或毛细管之后到低温换热侧之间并包括毛细管(节流阀)或其一部分以及低温换热侧到压缩机之间并包括其间的气液分离器。如果制冷剂不是氟利昂，是氨类的，则在低温换热侧3之前会有低压储液器，加热装置设在节流阀或毛细管到低温换热侧之间，包括低压储液器，因为该加热装置可设置在低压储液器上。图1与图2中所述的辅热换热方式灵活，可任意组合。热泵形式包括所有具有可用于辅热加热工质特点的热泵形式。任何人在本实用新型的启示下在该段都可以得出其它各种形式的产品，但不论在其形状或结构上作任何变化，凡是与本实用新型相同或相近似的技术方案，均在其保护范围之内。The utility model is not limited to the above-mentioned best implementation mode based on the law of frost growth and the characteristics of the refrigerant. The patent protection section is between the throttle valve or the capillary and the low-temperature heat exchange side and includes the capillary (throttle) or a part thereof and the low-temperature From the heat exchange side to the compressor and including the gas-liquid separator in between. If the refrigerant is not Freon but ammonia, there will be a low-pressure liquid receiver before the low-temperature
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123192A (en) * | 2013-03-20 | 2013-05-29 | 龚光彩 | External auxiliary heating frosting-proof capillary throttling integrated device |
| CN106247710A (en) * | 2016-08-19 | 2016-12-21 | 安徽省宁国市天成电气有限公司 | A kind of pipeline anti-icing equipment |
| CN106369877A (en) * | 2016-11-30 | 2017-02-01 | 广东美的制冷设备有限公司 | Heat pump system and defrosting control method thereof |
| CN108931075A (en) * | 2018-06-20 | 2018-12-04 | 广东美的暖通设备有限公司 | Heat pump system and its control method |
-
2012
- 2012-03-09 CN CN2012200883379U patent/CN202532795U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123192A (en) * | 2013-03-20 | 2013-05-29 | 龚光彩 | External auxiliary heating frosting-proof capillary throttling integrated device |
| CN106247710A (en) * | 2016-08-19 | 2016-12-21 | 安徽省宁国市天成电气有限公司 | A kind of pipeline anti-icing equipment |
| CN106369877A (en) * | 2016-11-30 | 2017-02-01 | 广东美的制冷设备有限公司 | Heat pump system and defrosting control method thereof |
| CN108931075A (en) * | 2018-06-20 | 2018-12-04 | 广东美的暖通设备有限公司 | Heat pump system and its control method |
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