External auxiliary heating frosting-proof capillary throttling integrated device

Abstract

Provided is an external auxiliary heating frosting-proof capillary throttling integrated device. The external auxiliary heating frosting-proof integrated device is composed of a capillary throttling device and an external auxiliary heating component, so that product structure is optimized. Modification area based on an original device is small and installation and changing are easy. Only the rear half portions, namely, the portions close to the outdoor evaporation side, of thermal coated throttling capillary tubes need to be heated, so that a refrigerant energy is improved, evaporation temperature is increased and the energy efficiency ratio of products is improved. The external auxiliary heating frosting-proof capillary throttling integrated device is suitable for all the other heat pump forms such as air source heat pumps, soil source heat pumps, water source heat pumps and heat source towers, so that the heat pumps can run more efficiently in adverse low-temperature high-humidity winter and the problem that the heat pumps are easy to frost when running in the environment is solved.

Description

technical field [0001] The invention relates to an integrated device for external auxiliary heating and anti-defrosting capillary flow. Background technique [0002] 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. [0003] There are three types of traditional de...

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Problems solved by technology

[0004] 1. Due to the shutdown of the fan of the indoor unit, the indoor heat exchanger absorbs little heat from the indoor environment, and the defrosting is relatively insufficient, making the defrosting time too long;

[0005] 2. Since the indoor fan stops, the indoor heat exchanger needs to absorb heat from the indoor environment when the indoor unit is defrosting, so that the room temperature will drop, making the indoor environment worse

Due to the long defrosting time, 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

[0006] 3. Frequent defrosting makes the unit in an unstable working state, and the heating effect and heating time cannot be guaranteed

The disadvantage of this defrosting method is: since the refrigerant on the high-pressure side comes from the refrigerant absorbed and vaporized by the evaporator, when the temperature is low and the defrosting lasts for a long time, there will not be enough heat to vaporize the refrigerant, so that the host does not have enough refrigerant protective shutdown

However, compared with the first two electric 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

The fourth is to place the electric heating element inside or outside the refrigerant tube in front of the heat exchanger. Although it is easy to install and operate, in many machines with slightly larger power, the length of the refrigerant tube between the capillary tube and the evaporator is very short, which is fundamental. Cannot implement this method

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

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