Rokee® Customized Diaphragm Couplings For Generator Sets for Customers, Rokee® is a well-known high-quality supplier of couplings and technical services in China.
The typical structure of a diaphragm coupling for a generator set includes two shaft sleeves, a set of diaphragms, and connecting bolts. The shaft sleeves are respectively connected to the shaft ends of the generator and the prime mover (such as a steam turbine, gas turbine, or wind turbine), and the diaphragm group is connected to the two shaft sleeves in a staggered manner in the circumferential direction through precision bolts. According to the compensation capacity requirements, generator sets usually adopt double or triple diaphragm structures, with rigid spacer rings in the middle. This design can simultaneously handle deviations in multiple directions, making it particularly suitable for long axis transmission of large generator sets.
From the perspective of material technology, the special diaphragm coupling for generator sets uses high-strength stainless steel (such as 304SS or 316SS) as the diaphragm material, which undergoes a special heat treatment process to achieve ideal elasticity and fatigue life. The thickness tolerance of high-quality product membranes can be controlled within ± 0.005mm to ensure uniform force distribution for each group of membranes. The shaft sleeve is forged from high-quality alloy steel (such as 42CrMo) and undergoes quenching and precision machining to ensure structural reliability when transmitting high torque.
In terms of performance parameters, the torque transmission capacity range of diaphragm couplings used in generator sets is extremely wide, ranging from a minimum of 10Nm to a maximum of 8100000Nm, fully covering the needs of small standby generator sets to million kilowatt level large generator sets. Its allowable working temperature range is also extremely wide, and standard products can adapt to environmental temperatures ranging from -20 ℃ to+280 ℃. When using special materials, it can even work reliably under more extreme temperature conditions. This makes diaphragm couplings an ideal choice for high-temperature transmission in gas turbine generator sets.
The lubrication free and maintenance free characteristics significantly reduce the operating costs of the entire life cycle of the generator set. Traditional gear couplings require regular replacement of lubricating oil, while diaphragm couplings completely eliminate this need. This feature is particularly valuable for offshore wind turbine units, as these units are typically installed in difficult to access offshore locations with extremely high maintenance costs. The use of membrane couplings in offshore wind turbines can reduce maintenance work on the transmission system by about 40%, while avoiding the risk of lubricating oil leakage polluting marine ecology. Similarly, in remote areas of solar thermal power plants or biomass power plants, maintenance free membrane couplings greatly reduce the workload of operation and maintenance teams.
In terms of the ability to compensate for deviations, the diaphragm coupling shows superior performance over other types of couplings. Due to factors such as thermal expansion, foundation settlement, or load changes, complex composite deviations often occur in the shaft system of generator sets. Diaphragm couplings can simultaneously compensate for axial, radial, and angular deviations, and their angular displacement compensation capability can reach twice that of toothed couplings. For example, in a combined cycle power plant, when the axis of the gas turbine and generator is offset due to temperature differences, the diaphragm coupling can effectively absorb this deviation and avoid bearing excessive additional loads.
High transmission efficiency is another key factor that membrane couplings are highly favored in power generation applications. Its transmission efficiency is as high as 99.86%, and the almost negligible energy loss means significant economic benefits for large generator sets.
The excellent environmental adaptability of membrane couplings enables them to cope with various harsh working conditions in the power generation industry. In the high salt spray environment of coastal power stations, stainless steel membranes exhibit excellent corrosion resistance; Under high temperature and corrosive gas conditions in waste incineration power plants, special material membranes can still maintain stable performance; For power generation equipment in the Arctic region, membrane materials with excellent low-temperature toughness ensure the reliability of the system in extreme cold environments. This extensive environmental adaptability greatly expands the design boundaries of generator sets, enabling engineers to deploy power facilities in environments traditionally considered 'impossible'.
Over the years, with excellent quality, we have been continuously providing many coupling products of various categories and uses complying with multiple standards and a full range of services, from the product selection to final installation and operation, for the industry fields of ferrous metallurgy, nuclear power, gas turbine, wind power, ropeway construction, lifting transportation, general equipment, etc. We strictly comply with quality system requirements and implement the whole process control to become a reliable and trustworthy partner of customers.
URL: https://m.rokee.com/coupling-cases/diaphragm-couplings-for-generator-sets.html