Overhaul of industrial refrigeration semi-closed and fully enclosed refrigeration screw compressors

Overhaul of industrial refrigeration semi-closed and fully enclosed refrigeration screw compressors Overhaul of industrial refrigeration semi-closed, fully enclosed refrigeration screw compressors, the difference between fully enclosed and semi-sealed refrigeration compressors: At present, the market is mainly semi-hermetic piston cold storage compressors (now more and more screw compressors), semi-hermetic piston cold storage compressors are generally driven by four-pole motors, their rated power is generally between 60-600KW, the number of cylinder For 2--8, up to 12. The hermetic compressor and the matched motor share a main shaft installed in the casing, so the shaft sealing device can be eliminated, reducing the possibility of leakage. advantage: The compressor and the motor are installed in a shell that is welded or brazed, sharing a main shaft, which not only eliminates the shaft sealing device, but also greatly reduces and reduces the size and weight of the entire compressor. Only the suction and exhaust pipes, process pipes and other necessary pipes (such as spray pipes), input power terminals and compressor brackets are welded to the surface of the casing. Disadvantages: It is not easy to open and repair. Because the entire compressor motor unit is installed in a sealed casing that cannot be disassembled, it is not easy to open for internal repairs. Therefore, it is required that the use of this type of compressor has high reliability and long life. The installation requirements are also high. This fully enclosed structure is generally used in small-capacity refrigeration compressors for mass production. Overhaul of industrial refrigeration semi-closed and fully enclosed refrigeration screw compressors The semi-hermetic compressors mostly adopt the cylinder block-crank box overall structure, and the motor casing is often an extension of the cylinder block crank box to reduce the connection surface and ensure the concentricity between the compressor-level motors; in larger machines In the model, it is made separable for the convenience of casting and processing, and is connected by a flange at the joint. The two spaces of the crankcase and the motor room are connected by holes to facilitate the return of lubricating oil. Overhaul of industrial refrigeration semi-closed and fully enclosed refrigeration screw compressors The main shaft of the semi-hermetic compressor is a crank shaft or an eccentric shaft structure; the built-in motor is cooled by air or water, and some uses low-temperature working fluid vapor. For semi-hermetic compressors in a small power range, centrifugal oil supply is often used for lubrication. This lubrication method has a simple structure, but when the compressor power increases and the oil supply is insufficient, the pressure lubrication method is used. advantage: 1. Can adapt to a wider pressure range and cooling capacity requirements; 2. The thermal efficiency is higher, and the unit power consumption is less, especially the existence of the gas valve makes the deviation from the design conditions more obvious; 3. Low material requirements, more common steel materials are used, the processing is easier, and the cost is relatively low; 4. It is relatively mature in technology and has accumulated rich experience in production and use; 5. The device system is relatively simple. Overhaul of industrial refrigeration semi-closed and fully enclosed refrigeration screw compressors The above-mentioned advantages of the semi-hermetic piston compressor make it the most widely used and largest production batch of refrigerators in various refrigeration and air conditioning devices, especially in the range of medium and small cooling capacity. At the same time, the semi-hermetic piston compressor not only maintains the advantages of easy disassembly and repair of the open compressor, but also eliminates the shaft seal device, which improves the sealing situation, the unit is more compact, low noise, low temperature When the working medium cools the motor, it is conducive to the miniaturization and weight reduction of the machine. At present, semi-hermetic piston refrigeration compressors such as R22 and R404a used for medium and low temperatures are widely used in cold storage, refrigerated transportation, freezing processing, display cabinets and kitchen refrigerators. Overhaul of industrial refrigeration semi-closed and fully enclosed refrigeration screw compressors York, GEA Grasso, and VILTER Weert are the industrial refrigeration brands that Kuaijia Industrial mainly serves. Other service brands: Qianchuan MYCOM, Kobelco, Howden, WuLeng, DaLeng, YanLeng, etc. Customers are located in many regions in China. Kuai'anjia Industrial Qualification Certificate: York dealer qualification, electromechanical installation qualification, S-9001 certification qualification, refrigeration maintenance installation qualification, etc. Industrial refrigeration semi-closed and fully enclosed refrigeration screw compressors are overhauled. Our company's technical engineers have high technical quality and strong safety awareness. With the obligation of serving customers and efficiently completing mechanical repair tasks, we complete all matters with an attitude. The maintenance operation certificate is complete: engineer certificate, refrigeration work certificate, high and low voltage electrician certificate, pressure vessel certificate, safety officer certificate, welder certificate, lifting certificate. Overhaul of industrial refrigeration semi-closed and fully enclosed refrigeration screw compressors

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