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Air conditioner defrosting method and air conditioner thereof

An air conditioner and air technology, applied in the field of air conditioner defrosting, to achieve the effect of improving indoor comfort, speeding up the defrosting process, and improving dryness

Active Publication Date: 2017-03-22
SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] From the existing methods summarized above, it can be seen that no matter whether it is to delay frosting alone or to delay frosting and shorten the defrosting time, it is through making major changes to the existing air conditioner, especially for the effect that can be achieved The method of electric heating outside the reservoir to shorten the defrost time also requires an additional electric heating device in the system

Method used

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  • Air conditioner defrosting method and air conditioner thereof
  • Air conditioner defrosting method and air conditioner thereof
  • Air conditioner defrosting method and air conditioner thereof

Examples

Experimental program
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Effect test

no. 1 example

[0062] A common air conditioner mainly includes an indoor unit, an outdoor unit, a compressor, and a throttling device, and the indoor unit includes an electric heater and a fan. The pipeline of the indoor unit is connected to the outdoor unit through the compressor, and the pipeline of the outdoor unit is connected to the indoor unit through the throttling device to form a loop. In the normal heating mode, the refrigerant in the outdoor unit passes through the outdoor heat exchange, enters the indoor unit after being pressurized by the compressor, and returns to the outdoor unit after being decompressed by the throttling device after heat exchange in the indoor unit.

[0063] The air conditioner of the present invention also includes a control module for performing the following air conditioner defrosting method. The air conditioner defrosting method of the present invention can quickly defrost in the defrosting mode, and can prevent or delay frosting in the heating mode (or ...

no. 2 example

[0076] Existing air conditioners have different control strategies for switching from heating mode to defrosting mode, such as judging according to whether the surface temperature of the outdoor coil is lower than the set temperature and the temperature is kept longer than the set time; some control is based on It is judged whether the exhaust temperature or exhaust pressure is lower than the set target. The existing air conditioner is adjusted to the defrosting mode by switching the four-way reversing valve to defrost and close the indoor unit fan 33 .

[0077] In the present invention, when the air conditioner enters the defrosting mode, the electric heater 32 and the fan 33 of the indoor unit 3 keep running, and the compressor speed is reduced to 50% to 80% of the compressor speed in the preset heating mode, but not This is the limit. The fan 33 accelerates the air flow between the heat exchanger and the electric heater 32 . The refrigerant in the heat exchanger in the in...

no. 3 example

[0083] On the basis of the second embodiment, this embodiment keeps the electric heater 32 and fan 33 of the indoor unit 3 working, reduces the compressor speed to 50% to 80% of the compressor speed in the preset heating mode, but does not This is the limit. And by maintaining the wind direction of the existing indoor unit fan 33 and closing the air outlet to optimize the comfort of using the air conditioner. for image 3 and Figure 4 According to the arrangement in the above, the arrangement and wind direction of each component are not changed, and the electric heater 32 of the indoor unit is kept working, but the air outlet is closed. At this time, the air conditioner does not blow air into the room, and the return air from the room passes through the action of the fan 33, absorbs the heat dissipation of the electric heater 32 inside the indoor unit 3 and releases heat to the fins of the indoor unit, and because of the air flow, it assists the PTC The temperature of the ...

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Abstract

The invention provides an air conditioner defrosting method and an air conditioner thereof. The air conditioner defrosting method comprises the following steps: in a heating mode, when an outdoor unit is located in the working condition of easy frosting, an electric heater in an indoor unit is started, the rotating speed of a compressor is lowered, and the evaporation temperature and the temperature of a coil pipe in the outdoor unit are increased; and in a defrosting mode, the electric heater and a fan of the indoor unit are kept rotating to accelerate flowing of air between a heat exchanger and the electric heater. The air conditioner comprises a control module for actuating the air conditioner defrosting method. The air conditioner defrosting method can open the electric heater and the indoor fan in the defrosting mode, so that a refrigerant of the heat exchanger of the indoor unit absorbs heat of electric heating, the dryness of the refrigerant in an outlet of the heat exchanger of the indoor unit can be increased, the inspiration liquid carrying quantity of the compressor is reduced, the stable operation of the compressor is improved, the defrosting process can be accelerated, and the indoor comfort of using the air conditioner in winter can be improved.

Description

technical field [0001] The invention relates to an air conditioner defrosting method, in particular to an air conditioner defrosting method which delays frosting and shortens defrosting time and the air conditioner. Background technique [0002] When using the air conditioner in winter, when the outdoor air temperature is between -2°C and 5°C, especially between 1°C and 2°C, if the outdoor air humidity is relatively high at this time, such as when the relative humidity is above 75%, when the outdoor air conditioner is When the temperature of the outer wall of the heater is lower than 0°C, frost will start to form outdoors. Frosting will form thermal resistance on the fins, reduce the heat transfer effect, and make it difficult for the refrigerant in the tube to absorb heat and evaporate; and as the thickness and range of frosting increase, the gap between the fins will be blocked, making it difficult for outdoor air to enter the heat exchanger for cooling. Heat exchange, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00
CPCY02B30/70
Inventor 陶宏张蕾嵇晓韫陈志敏
Owner SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
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