Application and professional knowledge of semi closed compressors in cold storage3
6、 Daily maintenance standards (key points of cold storage operation)
The service life and refrigeration efficiency of a semi enclosed compressor depend directly on daily operation and maintenance. Standardized maintenance can extend the equipment life to 8-12 years
1. Daily inspection (daily): Check the operating noise, vibration, and exhaust temperature of the unit, check whether the oil circuit pressure and refrigerant pressure are normal, investigate the frosting and leakage of the pipeline, and immediately stop the machine for inspection if any abnormal noise or pressure is found.
2. Regular maintenance (every 2-3 months): Clean the condenser fins and filters, remove dust and oil stains, and ensure effective heat dissipation; Check the lubricating oil level and quality. If it is cloudy, blackened, or deteriorated, it should be replaced in a timely manner to avoid wear on the rotor and piston.
3. Quarterly maintenance: Check the wear of valve plates, cylinder gaskets, and bearings, tighten pipeline screws and wiring terminals, test the insulation performance of the motor to avoid leakage and cold running faults.
4. Annual overhaul: Disassemble and inspect internal core components, replace aging seals and valve plates, clean impurities in the chamber, calibrate refrigeration pressure and temperature control parameters, and ensure stable operation of the unit at full load.
5. Condition adaptation and maintenance: Focus on cleaning the cooling system during high temperature summer to avoid overloading the unit due to high temperature; Check the anti freezing performance of the oil circuit in low temperature winter to prevent the solidification of lubricating oil from affecting operation.
7、 Common faults and solutions
1. Frequent start stop of the unit: It is often due to insufficient refrigerant, poor heat dissipation, or temperature control parameter faults. Troubleshooting and adding refrigerant, cleaning the condenser, and calibrating the temperature controller can solve the problem.
2. Insufficient cooling capacity and inability to lower the storage temperature: This is often due to clogged filters, deteriorated lubricating oil, worn valve plates, and air leaks. It is necessary to clean the filtration system, replace the refrigeration oil, and inspect the valve plate components.
3. Excessive noise and vibration of the unit: caused by loose foundation screws, worn internal bearings, and pipeline resonance. Tightening fasteners, replacing bearings, and optimizing pipeline fixation can improve the situation.
4. High pressure alarm: Poor heat dissipation due to dust accumulation in the condenser, air mixing in the system, and excessive refrigerant filling. It is necessary to clean the heat dissipation equipment, evacuate the system air, and adjust the refrigerant filling amount.
8、 Summary of Equipment Advantages and Disadvantages
advantage
Maintainable, long lifespan, low energy consumption, wide adaptability to working conditions, stable operation, precise temperature control, suitable for full-size small and medium-sized cold storage and large industrial cold storage. The operation and maintenance cost is much lower than that of fully enclosed units, and the cost-effectiveness is extremely high.
shortcoming
Compared to fully enclosed units, the structure is more complex and requires a certain level of professionalism from operation and maintenance personnel; The single machine has a larger volume and weight, and the initial equipment procurement cost is slightly higher.
9、 Industry Application Summary
The semi enclosed compressor firmly occupies the mainstream market of commercial refrigeration in cold storage due to its core advantages of repairability, high stability, wide operating conditions, energy saving and durability. Whether it is a small commercial supermarket cold storage, agricultural product preservation warehouse, or a large cold chain storage and industrial low-temperature freezing warehouse, efficient, stable, and low-cost refrigeration operation can be achieved by matching piston and screw semi closed units. It is currently the most practical, economical, and reliable refrigeration core equipment in cold chain engineering.
