Papers by Keyword: Air Compressor

Abstract: The paper uses the preprocessor of ANSYS to generate the model of 3D entity and mesh generation on WW0.8/10 air compressor crankshaft. Mesh generators are transferred into data that will be used in finite element analysis. Passing by dealing with force and commitment, it calculates the forces of pressure working conditions of crankshaft. They are used in stress analysis. The stress data is calculated from the calculator of ANSYS. The static load safe coefficient and the fatigue safe coefficient of the crankshaft are tested from known stress. The result provides a high reference value for the optimization improvement of the crankshaft.

Abstract: This is a series of in-tandem combinations each of heat pump, air compressor, and air turbine disposed in a wind tunnel, working together to generate clean/renewable electricity. The air compressor, located at downstream of the preceding air turbine, extracts air from this turbine thus reduces its backpressure and causes pressure drop at the turbine exit. Turbine output work Wtb is proportional to temperature difference (T3-T4) of turbine inlet/outlet air, which varies exponentially with turbine outlet/inlet air pressure ratio P4/P3 in adiabatic process as below: Wtb = MCp (T3-T4) = MCpT3{1-P4/P3^(1-1/k)} as T4=T3(P4/P3)^(1-1/k) where, M=mass flow rate of air; Cp&Cv=constant pressure/volume specific heat capacities of air; k= Cp/Cv=1.4. An ASME paper [1] verifies that a suction blower put at turbine exit reducing back pressure of 200 mbar can increase turbine inlet/outlet air pressure ratio P3/P4by 25%. Therefore, Wtb becomes more than those turbines without such blowers as (T3-T4) becomes larger, thus this unique Clean Energy Generation System of Heat Pumps, Compressors, and Turbines (HPCT system) achieves producing net useful electric power. In HPCT system, each air compressor works efficiently to reduce air pressure at preceding turbine outlet, as it extracts more air from the turbine than the blower mentioned in the ASME paper, because compressors have higher compression ratio than blowers. Thus, such feature gives higher turbine pressure ratio to each combination of HPCT system than those turbines without blowers (or compressors) to reduce back pressure at turbine exit. Therefore, HPCT system of higher turbine air pressure ratio P3/P4 achieves producing more turbine output work, as air temperature at turbine exit simultaneously drops more when P3/P4 becomes larger. Heat pump is an efficient device to move heat from low-temperature source to high-temperature sink, and geothermal heat source is preferable as it provides steady and warmer heat energy. This “moved” heat is used to heat up the air in wind tunnel to offset the energy extracted by turbine from HPCT system. Also, HPCT system is fully thermally insulated, thus theoretically being of zero heat loss, as it works adiabatically. P-V&T-S curves and performance of each combination of HPCT system working cycle are studied to compare it with actual gas turbine cycle and ideal Brayton cycle. Working examples of HPCT system are presented to simulate practical applications of HPCT system, and find out virtual net useful output work and energy efficiency. HPCT system is a “COLD” Engine of Zero Carbon Emission, works under moderate energy efficiency and with higher energy density than most existing renewable energy generation systems. More importantly, it is a simply designed system using only conventional knowledge, and can be made by the existing technology under the least investment risk.

Abstract: Air compressor tank is the important equipment in the automotive workshops and laboratories. Air compressor can be categorized as pressure vessel. Pressure vessel often has a combination of high pressure together with high temperature, in some cases of flammable fluids or highly radioactive material. Due to hazards, it is crucial to ensure there is no leakage on the products. In addition, vessel has to be design cautiously to cope with the operating temperature and pressure. The thickness of the PMAC should be optimized to get the best performance, the thickness cannot be very large due to the cost of material and exceeded weight and also cannot be very thin due to the failures caused by its internal pressure. In order to get the optimum thickness, finite element method software was used to simulate the stress analysis of PMAC with various thickness and various shapes.

Abstract: An application of an energy saving device for air compressor in intelligent industrial park is introduced in this paper. The program of air compressor energy saving system, working principle, and technical features are described in details. Actual running result shows that the air compressor device can greatly improve the power quality of enterprise, enhance the power factor. This device plays a role of energy saver in manufacturing process, indicates the direction of technical innovation in intelligent power for industrial park, and provides reliable technical support.

Abstract: This paper gives the comparison of structure and motion characteristics between the new swing-constrain reciprocating piston oil-free air compressor (new compressor) and traditional compressor through mechanism, kinematics and dynamics analysis. By comparison, the new compressor has more parts, more manufacturing and maintenance costs and less machine height that is benefit to reduce storage and transportation cost. Furthermore, reversing knocking strength between piston and cylinder is released ,friction loss is decreased dramatically between seal ring and cylinder and so the service time of seal ring is prolonged.

Abstract: When observing the WWD-0.8/10 air compressor that was noiseless and oilless, its vibration and noise were large. These phenomena were related to air compressors reciprocating inertial force and overturning moment which were separately depended on pistons acceleration and forces of connecting rod. Movement mechanisms three-dimensional solid model establishment, virtual assembly and motion simulation were accomplished by Pro/E. The main procedures were introduced in the paper. Many important metrical data obtained about pistons acceleration and forces of connecting rod by motion simulation could supply necessary references for air compressors dynamic optimizations.

Abstract: The method of using loaded and unloaded air supply control on the traditional air compressor not only makes the supply pressure unstable, but also makes frequently changing of the load state of the air compressor and causes economic losses. In order to save energy and improve efficiency,it designs a self-tuning PID control system based on parameter fuzzy to complete the transformation of the traditional air compressor.It uses C8051F020 microcontroller to control the closed-loop PWM frequency control system.After the transformation, the system can adjust the motor speed according to the size of gas consumption, and realize precisely constant gas pressure supply.It can be used in machinery,chemical industry and many other fields.

Abstract: The method of the impacting to manufacture micro-pits is put forward in order to reduce friction between Piston ring and Cylinder liner, and improve the effective of air compressor. Method and principium of the impacting to manufacture micro-pits is recounted. The cylinder liner is set on principal axis of the rotating lathe. The tool can feed toward axis or radial direction. The micro-pits deepness is controlled by axis feeding, and distance between two micro-pits is controlled by radial feeding. The motor drives eccentricity wheel, so that the tool engender the low frequency vibration. The micro-pits are manufactured by the tools on low-frequency vibration. The effective of micro-pits processing is improved because the matrix tools were designed and manufactured. The depth of micro-pits can be controlled, so that it is even. The dynamic lubrication is built up between the cylinder and the piston, because the distributing regulation and the structural parameter can be controlled, and the micro-pits distribute evenly and independently. A theoretic model was presented to study the lubrication performance, The theory of dynamic lubrication of the honeycomb micro-pits was researched. The air compressor cylinder liners were manufactured. The tests of air compressors which cylinder liners have no micro-pits and air compressors which cylinder liners have micro-pits were done. The test result proves that friction between Piston ring and Cylinder liner is reduced, and the effective of air compressor is improved because of micro-pits.

Abstract: A finite element model of floating raft vibration isolation system are established in this paper. The stress cloud and the natural frequencies are given based on the analysis of the static response and modes of this floating raft vibration isolation system. The calculation and analysis above may be helpful for preventing the floating raft system from working on resonant area and for keeping the oversize dynamic deformation. On this basis, vibration isolation effect has been assessed by vibration level difference

Abstract: Research status of state monitoring technology for air compressor and existing problems were analyzed, meanwhile, the necessity of designing a remote monitoring system was discussed in the paper. On the basis of analyzing the air compressor’s working principle, a remote monitoring system for air compressors was constructed by King-view configuration software, according to the technology of Ethernet and computer communication. With this system, real-time remote monitoring of compressors’ state and related operation parameters was realized; in addition, the latent faults of compressors on working could be predicted and warned. And that the efficiency of air compressors is improved, and the accidents of air compressors are avoided efficiently.