Theoretical analysis of loads on the gate rotor bearings in the single screw compressor

Li, T.; Wang, Z.L.; Huang, Rong; Wu, Wei; Feng, Qian

doi:10.1533/9781782421702.4.219

Cited by 3 publications

(3 citation statements)

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“…where µ R is the friction factor of the rolling bearing; F a and F r are the axial and radial load of the bearings respectively and are deduced in the reference [43] and T FM,k is the friction torque of the kth mechanical seal and is given by [42]:…”

Section: The Lubrication Properties With Multi Teeth Coupledmentioning

confidence: 99%

A Theoretical Method for Evaluating the Lubrication Performance of the Meshing Pair Profiles in Water Flooded Single Screw Compressors Based on the Micro Deflecting Motion Trajectory

Jiang

Gan

et al. 2020

Applied Sciences

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To improve the life of the meshing pair in single screw compressor (SSC), several meshing pair profiles (MPP) were proposed for raising the lubrication properties. Therefore, it is necessary to evaluate the lubrication performance of the MPPs. In this paper, an evaluation method based on micro deflecting motion trajectory (MDMT) is proposed and the theoretical model to realize MDMT is established. The model mainly contains a geometric model, a thermodynamics model, a hydrodynamic lubrication model and corresponding algorithm. With the presented method, three kinds of MPP including single straight line type (SSLT), single column type (SCT) and multi column type (MCT) have been analyzed. Obtained results show that compared to the SSLT and SCT, the MCT generates the greatest peak value of the water film pressure. The total torque applied on the gate-rotor generated by the water films decreases with the increment of the discharge pressure and increases with the machine size. The water film stiffness firstly decreases and then increases with the micro deflecting angle increasing. The water film stiffness at trailing side is always larger than that at leading side. As the discharge pressure increases, the MDMT curves approach the leading flank, and the lubrication properties get worse. With the machine size increasing, the MDMT curves move towards the trailing side and the lubrication performance is improved. Comparing to the other two MPPs, the MCT can achieve floating mesh without contact in relatively larger machines and comparably lower discharge pressure.

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Section: The Lubrication Properties With Multi Teeth Coupledmentioning

confidence: 99%

A Theoretical Method for Evaluating the Lubrication Performance of the Meshing Pair Profiles in Water Flooded Single Screw Compressors Based on the Micro Deflecting Motion Trajectory

Jiang

Gan

et al. 2020

Applied Sciences

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“…The V ð Þ can be calculated by the equations presented in Li et al 19 By using the above equations, the actual volume V sp 2s ð Þ, the gas state parameter at the end of suction process, and the discharge volume V d da ð Þ can be calculated, after that the built-in volume ratio is obtained by:…”

Section: Calculation Model Of By-pass Flow Processmentioning

confidence: 99%

Research on operating characteristics of single slide valve capacity control mechanism of the single screw refrigeration compressor

Wang

Zhan

Liu

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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In the single screw refrigeration compressor (SSRC), the single slide valve capacity control mechanism (SVCCM) is the functional component used to achieve capacity control under different load conditions with cooperation of screw rotor and housing. In this paper, a new calculation model considering internal compression and leakage is presented to research the capacity control process and built-in volume ratio control process. By this model, the actual capacity and built-in volume ratio at different slide valve work locations can be determined using the calculated by-pass area and discharge area. The influences of structural parameters of the slide valve to the control characteristics of the capacity control process and the thermodynamic properties of the compressor are analyzed. Through the comparison of the capacity control process and the built-in volume ratio control process, the axial displacements of the slide valve required in the capacity control and in the built-in volume ratio control were obtained. All of this work can provide the basis for the later optimization design for the slide valve.

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“…However, little research on oil-free twin-screw compressors has been reported in higher pressure ratio applications such as PET. Compared to twin-screw compressors, SSCs have an excellent force characteristic, since the axial force and the radial force applied on the screw rotor are all completely balanced [6]. The force applied on the gate-rotor in the SSC is far smaller than that applied on the twin-screw rotor [7].…”

Section: Introductionmentioning

confidence: 99%

Development and Experimental Study of the First Stage in a Two-Stage Water-Flooded Single-Screw Compressor Unit for Polyethylene Terephthalate Bottle Blowing System

Wang

Mao

et al. 2020

Energies

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The oil-free compressor is a key component in fabricating polyethylene terephthalate (PET) bottles for beverages and water. At present, the main compressor type used for blowing PET bottles is the reciprocating compressor. However, compared to screw compressors, reciprocating compressors have shortcomings of high energy consumption and too many consumable parts. Many manufacturers of PET bottles in Asia are seeking to replace reciprocating compressors with screw compressors, as we know. Screw compressors can be classified as single-screw compressors (SSC) and twin-screw compressors. Since the load in a twin-screw compressor is far larger than that in an SSC, SSCs are more suitable for being developed for high-pressure applications such as PET bottle blowing. This paper presents a performance study on an oil-free single-screw compressor as the first stage of the PET compressor unit. A 5.4 m3·min−1 prototype and its test rig were developed. The thermophysical process of the moist air is theoretically analyzed. The pressure loss on the flow path and the influence of the important parameters are experimentally investigated. It is found that water vapor cannot be separated during the adiabatic compression process. The results also show that the pressure loss from the discharging duct to the check valve accounts for the largest percentage of the total pressure loss. The experimental results further show that the discharge capacity and shaft power increase almost linearly with the motor speed. The efficiency declines with increasing injected water temperature. The discharge capacity and shaft power all increase with the injected water flowrate, and an optimum flowrate is found to ensure a highest isentropic efficiency. With the increase in discharge pressure, the discharge capacity decreases, and the shaft power increases. The isentropic efficiency is found to have its maximum value at a certain discharge pressure.

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Theoretical analysis of loads on the gate rotor bearings in the single screw compressor

Cited by 3 publications

References 0 publications

A Theoretical Method for Evaluating the Lubrication Performance of the Meshing Pair Profiles in Water Flooded Single Screw Compressors Based on the Micro Deflecting Motion Trajectory

A Theoretical Method for Evaluating the Lubrication Performance of the Meshing Pair Profiles in Water Flooded Single Screw Compressors Based on the Micro Deflecting Motion Trajectory

Research on operating characteristics of single slide valve capacity control mechanism of the single screw refrigeration compressor

Development and Experimental Study of the First Stage in a Two-Stage Water-Flooded Single-Screw Compressor Unit for Polyethylene Terephthalate Bottle Blowing System

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