Frozen oil does not amount to mark 'harm' case and harm!

in the process of maintenance, compressor wear caused by frozen oil not up to standard and cause burning accident ( Bearing or other moving parts wear and internal cause, holding shaft or wear after the scrap iron removing filters or iron fell into the compressor coil, cause the compressor burned, etc. ) It is not uncommon. Today let's look at a case, this case is not up to standard for frozen oil, brings to the refrigeration equipment failure.

a, case:

one day, received a low maintenance of the unit. Failure downtime for uncertain times. Fastest 10 minutes downtime, the longest 9 hours downtime ( Users to reflect the situation) 。 This is a double press machine.

check after arrived at the scene, the current normal downtime. And the fault shutdown it is not after the launch. Fault is still there, measuring pressure switch is normal, sure not judge fault has nothing to do with high and low voltage pressure downtime! So the power is reset after boot, lifted, for fault units can normal open it. Observation unit nameplate that 11 years and shouted to the customer asking if this machine maintenance, whether to change the oil, the customer answer never do maintain oil change, determine the downtime is the difference in oil pressure at this time.

according to the difference with timing shutdown basic hydraulic itself, so the judgment for the oil filter dirty, oil dirty! Turn off the compressor high and low pressure valve and oil return valve, direct drainage of refrigerant in the compressor, remove the oil discharge mouth bolt discharge of oil, oil in the dark, dark, pocket filter is blocked a look. Clean strainer installed time, open the unit high and low pressure valve and oil return valve boot is slightly a little bit for refrigerants. Commissioning about two hours to normal. After a good night to the scene to see the unit has cooled to minus 73 degrees, and see no problem will come back.

said suddenly received a phone call the next day the downtime, see the static balance pressure level of the refrigeration system is normal, the secondary cooling system is only 2 kg pressure. On high pressure up to 5 kg won't rise, low pressure slowly down, a minute or so low negative pressure and downtime.

try charging refrigerant of commissioning, found that high pressure is still not up. Turn off soon go negative pressure refrigerant cylinders, blockage unit system accordingly, release the refrigerant blockage, remove the filter discovered blow with the mouth. In the thought that blocked at the same time, why still can normal refrigeration so long? This idea in a flash, quantitative add refrigerant replacement to boot, low downtime and go soon. The filters are not at this time of the main point of failure, that is only a throttle valve.

find capillary crack a foaming agent release the refrigerant weld capillary is extracted and suppress found three root diameter four capillary flow, maintenance into the bottleneck at this time. From thinking before and after a few minutes in the compressor low voltage side on evaporator, 3 capillary into the evaporator is the copper pipe diameter is 16. Found that 16 brass doesn't make a little gas, maintenance into the dead end, best solution is not allowed.

evaporator blocked identified, so how thick copper pipe plug, plugs? Can be lotus shunt pipe plug head? 吗? Lotus head shunt is the copper pipe diameter 6, 4 capillary wall, 6 shunt tube wall? How all think impassability! !

continue to pressure to 12 kg or no air out, the box temperature is 60 degrees below zero in the ethanol, then maintenance completely can't find the train of thought. Test for more than an hour may not be long, then all of a sudden from 16 copper tube ( Capillary inlet) Spew out huge quantities of oil, mixed with ice at the same time, the oil plug is for sure.

PS: give us a warning from the above case, frozen oil type and quality will be used with refrigerant and cooling temperature is closely related. Or use doesn't match the lubricating oil will be produced in low temperature 'wax' phenomenon and plug line at the same time, on the other hand also parse the so-called 'oil' phenomenon, the causes of the formation of real and misunderstanding. Below, we'll look at inferior frozen oil, what are the common hazards.

two common hazards, frozen oil, not $index

1, frozen oil viscosity: frozen oil should be in under the working conditions of high temperature and low temperature extremes, if frozen oil viscosity is not enough, will cause the compressor bearings and cylinder wear, noise, cooling effect is reduced, at the same time and shorten the service life of the compressor, even in extreme cases may cause we usually say 'machine', the compressor is so slowly to be dead.

2, frozen oil pour: like have said, the compressor working temperature range is larger, so in order to guarantee the effect of lubricating oil will be able to get normal play, general requirements it remained good activity in low temperature condition. So the pour point generally should be below the freezing temperature, at the same time also better viscosity-temperature characteristics, which ensures that frozen oil in low temperature environment can smooth return from evaporator compressor. If frozen oil pour point is too high, will cause the oil return too slow, it is very easy occurrence 'burn-in'.

3, frozen oil flash point: frozen oil flash point too low may cause danger. Because of the frozen oil, volatile compared commonly big, low flash point increase in the number of oil can make the refrigeration cycle, increase the loss increase capital aside, is more serious is that in the process of compression heat will increase the possibility of burning dangerous, so the refrigeration oil flash point than refrigeration high exhaust temperature above 30 degrees.

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To build customers value by delivering high-quality products, services and solutions in innovative and cost effective ways. Hangzhou E cool refrigeration Co.,Ltd will realize this mission by setting the highest standards in service, reliability, safety and cost containment in our industry.

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