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    An explosion in a building in Haikou caused 1 death and 10 injuries. The initial judgment was that the central air conditioner was leaking

    An explosion in a building in Haikou caused 1 death and 10 injuries. The initial judgment was that the central air conditioner was leaking According to the news released by Haikou, after an on-site investigation by experts, it was preliminarily judged that the explosion accident of the Haibao City's Guomao Road Senbao Building was caused by the explosion of the central air conditioning refrigerant and refrigeration oil. At 21 o'clock on June 3, 2020, an explosion occurred in the Senbao Building, 13 Guomao Road, Longhua District, Haikou City. After the accident, Liu Cigui, Secretary of the Hainan Provincial Party Committee, Governor Shen Xiaoming, He Zhongyou, the Standing Committee of the Provincial Party Committee and Secretary of the Haikou Municipal Committee, and Ding Hui, the Mayor of the Haikou Municipal Committee, made important instructions respectively, requesting all efforts to save the injured, quickly identifying the cause, and properly doing a good aftermath. Disposal, comprehensive safety investigation. Bao Jian, deputy secretary of the Haikou Municipal Party Committee, Wang Zhongyun, member of the Standing Committee of the Municipal Party Committee and Minister of Propaganda, Yi Peng, member of the Standing Committee of the Municipal Party Committee and Director of the Public Security Bureau, Deputy Mayor Feng Honghao, heads of the functional departments of the Longhua District Party Committee and District Government, Public Security, Fire Protection and Municipal Emergency Management Bureau Rescue and organize on-site disposal, and visit the wounded in the hospital. A total of 1 person was killed and 10 persons were injured in the accident. Among them, 2 minor wounded persons have returned home after medical treatment. At present, the vital signs of the eight hospitalized wounded are stable, and there is no danger to life. In recent years, accidents caused by air-conditioning leaks are not uncommon. Air-conditioning leaks are mainly refrigerant leaks. What should we do if the air-conditioning system refrigerant leaks? Let's find out with the coldest bacteria! >>>> first step Shut down and unplug the air conditioner (to prevent danger during inspection), and connect a pressure gauge to the large valve. Observe the static pressure. ① 0-0.5MPa, no fluorine failure, at this time, gas refrigerant should be added to the system to make the static pressure reach 0.6MPa, so as to check for leaks. ② If the pressure is above 0.6MPa, the lack of fluorine will cause a leak detection. >>>> Second step R22 and compressor lubricating oil can be miscible, so when the R22 system leaks, the lubricating oil will be taken out, that is to say, the parts of the refrigeration system that have oil marks should be inspected. third step Key inspection parts of fluorine leakage failure: ① Newly installed machine (or transfer machine): 4 joints of connecting pipe between indoor unit and outdoor unit, nuts of large and small valves, and welded parts of lengthened pipes. ②The normally used air conditioner suddenly does not refrigerate: compressor suction pipe and exhaust pipe, system pipeline welding point, capillary tube, four-way valve connecting pipe and root. ③ Gradual lack of fluoride failure: 4 joints connecting the indoor unit and outdoor unit to the pipeline. Air conditioners that have replaced system components or repaired pipelines should also check solder joints. ④Position of oil marks in the system. >>>> the fourth step Leak detection method: Wet the towel (or sponge) with water, so as not to drip down, pour dishwashing liquid, gently rub it to enrich the foam, apply it to the area to be checked, and observe whether bubbling outwards or bubbling It means that there is a leakage of fluorine at the inspection site. If there is no bubbling, the inspection site is normal. >>>> the fifth step Leakage point processing method ① System solder joint leakage: repair solder joint leakage. ②The root of the four-way valve is leaking: replace the four-way valve. ③The wall of the bell mouth becomes thin or falls off: re-flare. ④The joint nut is not tightened: tighten the joint nut. ⑤ The thread of the large and small valve or indoor unit quick connector is damaged: replace the small and large valve or quick connector. ⑥ The joint nut is cracked or the thread is damaged: replace the connecting nut. >>>> The sixth step Micro-leakage troubleshooting method: If the leak point of the refrigeration system is too small or relatively hidden, if the leak point is not detected by the above method, you can use the following steps to check it. ① Distinguish between the fault parts: when the system is at a balanced pressure, connect a pressure gauge and record the system pressure value at this time, then take it off, close the valve core of the large and small valves, and separate the pressure of the indoor unit and outdoor unit system. After waiting for a period of time (determined by the size of the leak point), then connect the pressure gauge, slowly open the large valve spool, and check whether the gauge needle is rising or falling: if it is rising, it means that the pressure of the outdoor unit is higher than the indoor unit, and the fault In the indoor unit, focus on checking the evaporator and connecting pipes; if it is falling, it means that the pressure of the indoor unit is higher than that of the outdoor unit. If the fault is in the outdoor unit, focus on checking the condenser and the pipes in the outdoor unit. ② Increase the leak detection pressure: Since the static pressure of fluorine is up to about 1 MPa, for the fault parts with small leakage points, the system pressure should be increased to check. If the conditions are available, nitrogen can be used. The nitrogen bottle can be directly charged into the air conditioning refrigeration system through the pressure gauge through the connecting pipe. The static pressure can reach 2MPa. Dangerous reminder: Oxygen with high pressure encounters the compressor's refrigeration oil and will spontaneously ignite causing the compressor to explode. Therefore, it is strictly forbidden to flush oxygen into the refrigeration system for leak detection. Remember! ③Put the refrigeration system into the water: If the leak point is still undetectable after distinguishing the fault location and increasing the leak detection pressure, you can put the suspected system part (such as evaporator or condenser) into the clean water and emerge through observation Bubbles to find missing points. I believe many people have heard of adding refrigeration oil to the central air conditioner, so where is the refrigeration oil added? When is it necessary to add the refrigeration oil? How should the refrigeration oil be added? 1 Under what circumstances need to replace the special refrigeration oil for central air conditioning Whether the central air conditioner needs to replace the freezing oil is determined according to the indicators, which mainly include the following indicators: 1) PH value index: when the ph value of the lubricating oil is below 6, you need to consider replacing the freezing oil, because the acidification of the lubricating oil will directly corrode the equipment and affect the life of the compressor motor. It is recommended that you regularly check the freezing oil If the pH value cannot be checked, the drying filter of the system should be replaced regularly to keep the system dryness under normal conditions. 2) Pollution index: If it is detected that the pollutant per 100ml of frozen oil exceeds 5mg, it is recommended to replace it. 3) Water content: If the water content in the freezing oil exceeds 100 ppm, the freezing oil needs to be replaced. 2 What is the replacement cycle? Under normal circumstances, the normal refrigeration oil for normal central air conditioning can continue to operate for about 10,000 hours, but this is below the relatively ideal value. When the environment is not good or the surrounding conditions are bad, the staff should still use the detection index regularly The tool performs quality inspection on the special refrigeration oil for central air conditioning. Once the PH index drops, the pollution index rises, and the water content is large, it needs to be replaced in time to avoid that the deteriorated central air conditioning special refrigeration oil does not protect the compressor. On the contrary It will hinder its normal operation. In addition, in the process of replacing the special refrigeration oil for the central air conditioner, it is recommended to power off the operation, remember to shut down before, to avoid the current during the replacement or the machine is not cooled, and the scald during the oil replacement process. 3 Steps for adding refrigeration oil to central air conditioner There are generally three ways to add lubricating oil to the air-conditioning compressor. It is sucked from the through hole beside the suction cut-off valve, added from the oil filling hole, and added from the lower part of the crankcase. The specific steps are as follows: 1. Close the suction cut-off valve, start the compressor for a few minutes, discharge the refrigerant in the crankcase into the condenser, and make the crankcase vacuum. Shut down and immediately close the exhaust shut-off valve, slowly unscrew the screw plug of the bypass hole of the exhaust shut-off valve to release the residual gas in the high-pressure chamber. Unscrew the screw plug of the bypass hole of the suction stop valve, and install the taper connector and the copper tube. 2. Prepare the lubricant. 3. Press the mouth of the oil suction pipe with your finger and start the compressor to extract the air in the crankcase. If liquid hammering is found, let the compressor continue to run for 2 to 3 minutes to make the inside of the crankcase vacuum, and stop when the finger holding the nozzle feels a strong suction force. 4. Immerse the orifice pinched by the finger in the oil, and let go after the immersion, and the oil will be sucked into the crankshaft tube from the oil tube. 5. Observe whether the oil level indicator reaches the oil level line. 6. Remove the copper pipe and connector, screw on the screw plug and tighten, start the compressor to let the air sucked in the crankcase out, and when the exhaust sound is not heard, tighten the plug of the exhaust shut-off valve. 7. Open the suction and exhaust shut-off valves to complete the refueling work. The above air-conditioning refrigerant leakage disposal and refrigerating oil addition method hope to be useful to everyone. In the future, you can operate carefully and check carefully to avoid future troubles.

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