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Control method for outdoor unit of air conditioner and air conditioner

A technology of air conditioner room and control method, which is applied in the direction of control input involving air characteristics, space heating and ventilation control input, heating and ventilation control system, etc., and can solve the problem of attenuation of cooling capacity of air conditioners, inability to control refrigerant bypass, etc. problems, to achieve the effect of ensuring normal operation, ensuring high-temperature refrigeration capacity, and reducing refrigerant bypass

Active Publication Date: 2015-09-09
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this unloading control method cannot control the bypass volume of the refrigerant, it can only be opened or closed
Once the unloading valve is activated (completely closed), it will cause a large attenuation of the cooling capacity of the air conditioner

Method used

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  • Control method for outdoor unit of air conditioner and air conditioner
  • Control method for outdoor unit of air conditioner and air conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 2 As shown, this embodiment provides a control method for an outdoor unit of an air conditioner, including the following steps:

[0040] S1. The air conditioner starts to run after receiving the start signal, and runs for the first preset time;

[0041] Preferably, the first preset time is set to 3-5 minutes. Within the first preset time frame, combined with figure 1 As shown, when the air conditioner is in cooling operation, the compressor 1 transports the high-temperature and high-pressure refrigerant gas through the compressor exhaust pipe 2 to the condenser 4 for heat dissipation through the four-way valve 3, and the refrigerant high-pressure liquid condensed by the condenser 4 passes through the throttling part The throttling of 5 lowers the temperature and pressure, and then enters the evaporator 7 to evaporate and absorb the heat of the indoor air. After that, the low-temperature and low-pressure refrigerant gas enters the compressor 1 through t...

Embodiment 2

[0060] The technical content of the second embodiment that is the same as the first embodiment will not be described repeatedly, and the content disclosed in the first embodiment also belongs to the content disclosed in the second embodiment. The preset opening is controlled, that is to say, the second embodiment adds a level of preset opening (that is, including the first preset opening, the second preset opening and the third preset opening) on ​​the basis of the first embodiment. set opening).

[0061] Specifically: in step S9, the controller controls the electronic expansion valve to open at a third preset opening and run for a first preset time, and the third preset opening is smaller than the second preset opening; wherein, the third preset The opening degree is preferably 30%-50% in this embodiment.

[0062] Afterwards, continue to execute step S10, the controller detects the state of the high pressure switch in real time, if the high pressure switch is in the disconne...

Embodiment 3

[0067] The same technical content of the third embodiment and the second embodiment will not be described repeatedly. The content disclosed in the second embodiment also belongs to the disclosed content of the third embodiment. The difference between the third embodiment and the second embodiment is that the third embodiment uses The preset openings are controlled, that is to say, on the basis of the second embodiment, one more level of preset openings (the first preset opening, the second preset opening, the third preset opening and the fourth preset opening).

[0068] Specifically, such as figure 2 As shown, in step S11, the controller controls the electronic expansion valve to open at the fourth preset opening and run for the first preset time, and the fourth preset opening is smaller than the third preset opening;

[0069] Preferably, the fourth preset opening degree is 0%-20%, so as to minimize the refrigerant bypass flow from the high pressure side to the low pressure ...

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Abstract

The invention relates to the technical field of air conditioners, in particular to a control method for an outdoor unit of an air conditioner and the air conditioner. The control method for the outdoor unit of the air conditioner comprises is capable of controlling opening degree of an electronic expansion valve in accordance with the state of a high-voltage switch in a real-time mode. After the air conditioner is started up to operate and reaches the set high-voltage protection pressure, the method comprises following steps: firstly, controlling the electronic expansion valve to be opened at a large opening degree by a controller in order to rapidly decrease high voltage and to avoid protection shutdown of the air conditioner or overload protection of a compressor; secondly, controlling the electronic expansion valve to gradually decrease the opening degree by the controller in order to reduce bypassing amount of refrigerants and to gradually increase the refrigerating capacity of the air conditioner. Therefore, bypassing amount of refrigerants flowing from a high-voltage side to a low-voltage side is decreased to the maximum extent on the premise that high voltage does not exceed the high-voltage protection value set by a system. As a result, the air conditioner is guaranteed to work normally in a high-temperature environment and the high-temperature refrigeration capability is ensured to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a method for controlling an outdoor unit of an air conditioner and an air conditioner. Background technique [0002] At present, when the existing air conditioner operates in a high temperature environment, the high pressure of the refrigeration system is relatively high. When the high pressure reaches the pressure protection value set by the air conditioner, the high pressure protection switch will be activated or the compressor will be overloaded, and the air conditioner will shut down. In order to solve this problem, some air conditioners, especially those suitable for T3 high temperature areas, are equipped with unloading valves. When the high pressure reaches the set pressure value of the unloading valve, the unloading valve will automatically open, so that some The refrigerant on the high-pressure side bypasses and flows into the low-pressure side, thereby reducing...

Claims

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Application Information

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IPC IPC(8): F24F11/00
CPCF24F11/30F24F11/83F24F11/84F24F2110/00F24F2140/12
Inventor 黄进猛陈灿文
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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