The spiral chiller consists of accessories such as compressors, skeptics, evaporationers, and expansion valves, and should the refrigeration equipment fail, attention should not be focused solely on a single site, but rather on a comprehensive inspection and comprehensive analysis of the system as a whole. This requires practical accumulation and theoretical guidance. The operator, through a review of long-term practice, has found a lot of experience in checking failures, which can be summed up into a set of basic methods: "one, two, three, four."。
“one hearing”: the sound of equipment such as compressors, expansion valves and so forth in operation
`direct touch': cold thermal changes in the associated parts and pipe connections in the touch system, cold thermal and vibration conditions in the touch compressor
3 "three-looking": see the size of the operating high and low pressure value, the size of the oil pressure, the size of the water pressure. The size of the adjusted values for pressure relays, temperature relays, pressure relays. (b) see oil levels, liquid levels, evaporation units, return tubes and fluid pipes for frosts and condensation
“four analysis”: using the theory of refrigeration work, the phenomenon is analysed, judged, the cause of cessation is identified and excluded in a targeted manner。
When the spiral chiller is activated, it should first be known whether the refrigeration system is functioning properly. The following is a brief introduction to the functional content and logo, for information purposes only:
The condenser cooling water should be sufficient, the water pressure should be greater than 0. 12 mpa and the water temperature should not be too high。
For spiral-type chillers, the pump pressure table reading shall be 0. 15 ~0. 3 mpa higher than the exhaust pressure。
In any case, fluorine chillers do not exceed 70 °c, ammonia chillers do not exceed 65 °c, with a minimum of 30 °c dry. Under normal operation, lubricants should not be foamed (except for fluorinated chillers)。
The cooler's exhaust temperature. A further increase in the temperature of the exhausts is in proportion to the flash point of the refrigerated oil (160°c), which is detrimental to the equipment. Therefore, from the point of view of use, the exhaust temperature should not be too high, and the cause should be found when it is too high。
Cooled pressure high and low. The form of condensers and the use of refrigerants are determined mainly by the water source. The liquid surface of the receptacle shall not be less than one third of the liquid surface indicator, and the oil surface of the warp case shall not be less than the horizontal central line of the indicator window (in the case of two surface indicator windows, the oil shall be between the two glass central lines)。
Fluorinated oil separator automatically returns to the pipeline, which is normal when cold and hot, with a cold-heated cycle of around 1h. There should be no apparent temperature difference between filters of liquid pipes ... And frosts should not occur, otherwise they are blocked. Fluorine chillers should be flat and dry and hot. Fluorinated systems should not seep oil at their interfaces, which indicate fluorine leakage。
The upper and lower heat of the working hand-to-penetrating condensers shall cool the upper and the cold thermal boundary shall be the liquid surface of the refrigerant, the oil separators shall also be the upper thermal, the lower thermal, and the cold thermal boundary shall be the oil or liquid surface. Refrigerator safety valves or perforation valves should cool at one end of the pressure, which, if not cooled, indicates high pressure band gas。
The operating vapour pressure should be similar to the inhaling pressure, and the exhaust pressure at the high pressure end should be similar to the condensed pressure, the pressure of the receptacle and, if it is not so, abnormal。
In a given flow of water, cooling water should have temperature differentials in access, such as no temperature differentials or minimal temperature differentials, indicating that thermal exchange equipment has a stain on the heat surface and requires a stoppage for cleaning。
Refrigerators themselves should be sealed and should not leak refrigerants and lubricants. For axle seals, trace seepage is allowed at standard production capacity of 12. 6 x 1000 kj/h, no more than 10 droplets per hour at standard production capacity of 12. 6 x 1000 kj/h, and no droplet is allowed for fluorine freezers。
Refrigerator axial seals and bearings not exceeding 70°c。
The swelling valves are evenly condensed or exposed, but no thick frosts can be found at the import point. When it passes through the swelling valve, it can only hear a silt whisper。
Pressure gauges in the system should be relatively stable, and thermometers are correctly indicated。
I. Method of repairing the exhaust pressure of the screwr
1. Check for air in the water system. The solution is to vent the pipe at the highest level manually until there is no air in the water system。
2. Check if the cooling towers have malfunctions, e. G., inoperable, belts, etc. Identify the reasons for the malfunctioning of the cooling tower, repair the electrical or electrical power supply, adjust the space between the electric and belt, or replace the new belt。
3 checks for over-inhalation pressure and the solution is to be found below in the “over-inhalation pressure maintenance method”。
4. Checks for excessive ambient temperatures and protection of aircrew exhaust pressure due to high outdoor temperatures should focus on improving external heat dispersion and adjusting cooling tower winds。
5. Checking whether cooling water flows are too small is the solution to check the cooling system and adjust the flow。
To check if compressor oils are too low, the solution is to find out why compressor refrigerated oils lack fuel, such as compressor run oil, manual refuelling oil, low load of compressor, if not refuelling, adding 5-10 litres of refrigerated oil to the system with a fuel pump, and then release additional refrigerated oils when the fleet returns to compressor, although the method works。
Ii. Maintenance approach to introductive energy experiences in the shoot
1. Refrigerants are overloaded and the solution is to release some refrigerants and observe operational data to ensure that the parameters are located in the right place。
Liquid refrigerants flow from evaporation to compressors, and the solution is to check and adjust the inflation valve parameters (need to enter group parameters)。
3. Refrigerated water intake temperature is above the permitted maximum, and the solution is to ensure that the temperature of the swelling valve is kept in close contact with the inhaler and completely insulated from the outside world。
Iii. Screen hydrip protection maintenance material
1. Check if the cooling water is too hot and if the cooling water is too hot, turn on the cooling winder and check whether the cooling tower recharge is normal? Is the cooling pump into the vent filter dirty? Does the cooling pump reverse? The problem could be solved by excluding the above anomalies。
2. To check whether the cooling towers are malfunctioning and, if the cooling machines are burned, replace them or maintain them。
3 checks whether the high pressure stopping values are incorrect and, if so, enter parameters to modify the high pressure protection values, such as increasing the time limit to 50 seconds。
4. Is the pressure switch open? In the case of a replacement request, a short-link approach may be used to exclude it (use caution!)。
Case of maintenance: the water cooling engine was not loaded, the crew was not functioning properly, the temperature of the cold water was not observed on site and the crew was not functioning properly。
The possible reasons for the irregular loading as a result of the analysis are as follows:
1. Refrigerants are inadequate: this is not the main reason why water temperature has declined after adding 50 kg of refrigerant (85 kg of unit injection) but is not properly loaded
Edi valve failure: turning off the edi valves, removing the dry filter, then opening the evaporation sidebarrel, the refrigerant cannot eject from the filters through the edi valves, remove the electronic valves for inspection and find the internal valves to die。
Spray compressor failure eliminated
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