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Air-conditioning system oil plug detection method and detection device, air conditioner

An air-conditioning system and detection method technology, which is applied to the detection of oil plugging in air-conditioning systems, the detection device for oil plugging in air-conditioning systems, and the field of air conditioners. and other issues to achieve the effect of improving the comfort of use, ensuring the service life and improving the user experience

Active Publication Date: 2018-11-20
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

[0004] However, for the flammable refrigerant—R290 refrigerant, its viscosity will increase sharply at low temperatures, especially in cooling and heating inverters. The ultra-low temperature refrigerant and lubricating oil need to enter the condenser (outdoor heat exchanger) through a throttling device (such as an electronic expansion valve). At the same time, the amount of flammable refrigerant is less due to safety considerations, so the pressure of the air conditioning system is higher than that of R410a The pressure of the air-conditioning system of refrigerant and R32 refrigerant is much lower, which will cause oil with a relatively high viscosity to block the throttling device, resulting in the inability of flammable refrigerants to participate in the cycle, which will cause the compressor to run idly, the capacity and operating power will decrease, and the system will fail. The oil lacks fluorine, and the motor of the compressor overheats after long-term operation, which greatly reduces the service life of the compressor and the system, and affects the user experience. great influence

Method used

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  • Air-conditioning system oil plug detection method and detection device, air conditioner
  • Air-conditioning system oil plug detection method and detection device, air conditioner
  • Air-conditioning system oil plug detection method and detection device, air conditioner

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Experimental program
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Effect test

Embodiment 1

[0054] Embodiment 1: Solve the problem of oil plugging by using a throttling device with a pipe diameter greater than or equal to a preset pipe diameter (such as 1.5mm), that is, increase the flow rate of the throttling device, wherein the throttling device includes a capillary tube, a throttle valve .

Embodiment 2

[0055] Embodiment 2: By increasing the opening of the electronic expansion valve, that is, when the oil blockage of the air conditioning system is detected, the electronic expansion valve is adjusted from the current opening to the preset opening (generally 450 steps to 480 steps), That is to increase the flow rate of the throttling device, and after running for a certain period of time (generally 5 minutes to 10 minutes) at the preset opening degree and when the problem of oil plugging is detected, the electronic expansion valve is adjusted from the preset opening degree back to The current opening returns to the normal operation before the oil blockage, otherwise it will prompt the system to fail and shut down, so as to avoid the collapse of the air conditioning system due to the oil blockage.

Embodiment 3

[0056] Embodiment 3: The problem of oil plugging is solved by connecting the bypass assembly in parallel with the throttling device of the air conditioning system, wherein the bypass assembly includes: a bypass pipe arranged in parallel with the throttling device and a cut-off pipe arranged on the bypass pipe valve, when the air-conditioning system is detected to be blocked, open the stop valve and close the throttling device, so that the refrigerant can circulate in the air-conditioning system through the bypass component, and after a certain period of operation (usually 5 minutes to 10 minutes) Re-enable the throttling device and close the shut-off valve, and re-open the throttling device for a certain period of time (generally 3 minutes to 10 minutes), and when the system oil blockage is detected again, it will prompt the system to fail and shut down.

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Abstract

The invention provides a method and a device for detecting oil choking of an air conditioning system and an air conditioner. A refrigerant used by the air conditioning system is a flammable refrigerant. The method comprises the steps of judging whether the air conditioning system is in a preset working state or not; detecting a system pressure value at the position of a second end of a throttling device after the flammable refrigerant flows from a first end of the throttling device of the air conditioning system to the second end of the throttling end at first preset time intervals when the air conditioning system is judged to be in the preset working state; judging whether the system pressure value is smaller than or equal to a preset pressure value; determining whether the air conditioning system is in oil choking or not according to a judging result. According to the technical scheme, whether the air conditioning system using the flammable refrigerant is in oil choking or not can be timely and effectively determined, a phenomenon that the air conditioning system is in ability attenuation because of oil choking can be further avoided, and the service life of a compressor and the air conditioning system can be ensured.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for detecting oil plugging in an air conditioning system, a device for detecting oil plugging in an air conditioning system, and an air conditioner. Background technique [0002] At present, in the field of air-conditioning and refrigeration technology, R410a refrigerant is mostly used to replace R22 refrigerant, and its advantages are obviously reflected in inverter air conditioners. However, due to the high GWP (Global Warming Potential) of R410a refrigerant, Under the background that the global warming effect is getting worse and countries around the world are paying more and more attention to addressing global climate change, it will be gradually eliminated. Therefore, at present, we are more focused on researching low-GWP refrigerants represented by R32 refrigerant and R290 refrigerant, especially for R290 refrigerant, which has almost no pollution. At the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/64F24F11/38F24F140/12
CPCF24F11/30F24F11/62F24F11/64F24F11/83F24F2110/00F24F2140/12
Inventor 刘旭
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD