Overhaul of York YFG type screw compressors

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This post was last edited by Lantian on 2017-5-28 at 14:08: https://gss3.baidu.com/6LZ0ej3k1Qd3ote6lo7D0j9wehsv/tieba-smallvideo-transcode/171498202_6b54856a9bb37e2353724d6d3cc09356_865fbd7d_1.mp4?authorization=bce-auth-v1%2Fde94045c2e42438fad71ab8df47a6727%2F2017-05-24T10%3A35%3A09Z%2F1800%2F%2Fd595041e5a5d648faa8abf23a80774ad60cf720266fef3631a0822306d52e3ff. Maintenance and overhaul of York YFG screw compressors, which are used for industrial refrigeration; the male and female rotors are supported by axial and radial bearings, with a tooth ratio of 4:6. The fixed volume ratio is generally one of 2.2, 3.5, or 5.0; the slide valve allows for stepless adjustment from 15% to 100%. A helical potentiometer is used for indicating the position of the slide valve, and O-rings are commonly employed for the sealing of the unit. The common head models are YFG1918, YFG2313, YFG2317, and YFG2321, with the corresponding unit models being RWKII40, RWKII55, RWKII65, and RWKII100. This article mainly describes the assembly process. 1. Disassembly for major overhaul of YFG screw compressor: 1.1 Disassemble the compressor. 1.2 Repair various vulnerable components such as the screw, the end face of the chamber, etc. 1.3 Clean all mechanical components. 1.4 Replace bearings, sealing rings, gaskets, balance pistons, balance piston sleeves, adjustment shims, shaft seals, etc. (depending on the specific situation). 2. Assembly and maintenance of YFG compressors: 2.1 Insert the slide valve into its seat. 2.2 Combine the exhaust surface of the exhaust end cover with the rotor end cover surface. 2.3 Measure the gap between the slide valve and the guide surfaces (using a feeler gauge), as well as the gap between the slide valve and the rotor (using special tools). 2.4 Heat the inner ring of the sliding bearing while cooling the outer ring with a refrigerator. 2.5 Install the rotor inside the rotor chamber. 2.6 Attach the suction end cover to the compressor body. 2.7 Measure the total gap of the rotor within the chamber. 2.8 Install the thrust bearings and measure/adjust the gap at the exhaust end. 2.9 Install the shaft seal. 2.10 Measure the bearing clearance. 2.12 Measure and adjust the gap between the balance piston and the sleeve (5–8 threads is appropriate). 2.13 Install the slide valve piston and the oil groove cover plates (using special tools). 2.14 Install the energy indication mechanism. That’s all regarding the major repair of York YFG screw compressors. If you have any questions, feel free to discuss them together. http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526130137183718855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123753445344855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123822682268855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123816061606855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123954865486855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123961916191855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526125139013901855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526125228252825855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526125211271127855136.jpg