Construction and simulation of novel asymmetrical scroll wraps for scroll vacuum pumps

Wang, Jun; Dong, Lu; Xi, Zhoujin; Cao, Chenyan; Wang, Zengli

doi:10.1016/j.vacuum.2020.109837

Cited by 8 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As displayed in Figure 4, A I,d1 is divided into three triangles and one sector type region. It is noticeable that the geometric symmetry is considered here and makes the analysis simpler, as expressed in Equation (19).…”

Section: Compression Processmentioning

confidence: 99%

“…Based on this work, the geometric theory of different scroll tipmodified profiles was developed, including dual-arc, arcline-arc, and asymmetric arcs [17], and multiple segments of circular arcs [18]. In addition, this design method was also applied in a new type of vacuum pump with scroll tip modified by asymmetric circular arcs [19]. The analytical method, a general mathematical method, has better geometrical adaptability for different shapes of working chambers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Improved Geometric Theoretical Model and Throughflow Prediction Method for a CO2 Scroll Compressor of Automotive Air Conditioning System

Song

et al. 2023

International Journal of Energy Research

View full text Add to dashboard Cite

The scroll-type compressor is the core component of the refrigeration system using the natural refrigerant carbon dioxide. An accurate scroll geometric theoretical model is essential for evaluating and enhancing compressor performance. The present paper proposed and validated an improved geometric theoretical model of a scroll compressor. A vector triangle method-based general piecewise function describes precisely the volume variation of the working chambers, based on which the transient throughflow modeling and performance evaluation of a carbon dioxide scroll compressor were conducted. The mechanisms and influencing factors of the suction precompression and the asymmetry discharging were analyzed. The results indicate that the strength of the suction precompression is mainly influenced by the suction vacuum under different rotating speeds, partly associated with the tangential leakage under low rotating speeds. The increasing initial suction pressure contributes to the linear raising of the pressure difference between suction initial and ending pressures, decreasing the precompression extension slightly. The variation of the discharge throughflow areas of two symmetric discharge chambers dominates the pressure asymmetry, which is gradually eliminated by the overlapping throughflow area. Compared with the circular discharge structure, the waist-shape port reduces the pressure asymmetry degree and shortens its duration.

show abstract

Section: Compression Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Improved Geometric Theoretical Model and Throughflow Prediction Method for a CO2 Scroll Compressor of Automotive Air Conditioning System

Song

et al. 2023

International Journal of Energy Research

View full text Add to dashboard Cite

show abstract

“…An inherent advantage of scroll compressors compared to other volumetric compression machines is the longer available time for the compression and discharge processes (Evandro et al, 2020). Therefore, they are gradually being used in compressed air energy storage systems, where they can also be used as expanders (Dumont et al, 2018;Fanti et al, 2020;Wang et al, 2021a). The use of a scroll compressor as a vacuum pump has also been tested (Wang et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, they are gradually being used in compressed air energy storage systems, where they can also be used as expanders (Dumont et al, 2018;Fanti et al, 2020;Wang et al, 2021a). The use of a scroll compressor as a vacuum pump has also been tested (Wang et al, 2021a). However, scroll compressors are now mainly used in applications where low noise and vibration levels are important, such as residential heat pumps, residential cooling systems, and air conditioning systems.…”

Section: Introductionmentioning

confidence: 99%

Numerical calculation of scroll compressor geometry and assessment of its delivery

Prezelj,

Cerkovnik

2023

Front. Mech. Eng.

View full text Add to dashboard Cite

This paper proposes innovative numerical methods for calculating the chamber volumes and tangential leakage gaps in a scroll compressor, a critical aspect of enhancing its performance and efficiency. It proposes two methods, namely, moving away from traditional analytical approaches and presenting a 0D model for mass flow delivery at varying rotational frequencies and discharge pressures. The first method utilizes the numerical identification of conjugate points with a minimum distance within the fixed and orbiting involute pair to calculate chamber volumes. This approach compensates for integration errors by considering the subareas defined by the normal distance of each involute to the other. The second method simplifies the process by assuming that the line defining the orbital angle intersects the involutes at the conjugate points, with volumes calculated using area discretization on triangles. Both methods underwent validation against three analytical calculations, showing an agreement within an overall uncertainty error of 3% for the maximum suction volume. The 0D model’s results were compared with Ma et al.'s hybrid method and actual measurements. Upon improving Ma’s model by accounting for intake air heating and negative pressure in the intake volume, a significant agreement between modeling and measurements was observed. This study concludes that the proposed numerical methods can enhance the accuracy of scroll compressor geometry calculation and mass flow delivery, considering the tangential gap.

show abstract

“…Additionally, they found that compression and overcompression would lead to significant gas pressure variation and violent compression torque pulsation [22,23]. Wang et al optimized the profile of the asynchronous suction scroll vacuum pump, established an asymmetric scroll structure with an equal volume ratio, and solved the problem of irreversible gas flow loss [24].…”

Section: Introductionmentioning

confidence: 99%

Internal Flow and Cavitation Analysis of Scroll Oil Pump by CFD Method

et al. 2021

View full text Add to dashboard Cite

In this study, a three-dimensional model with actual clearances was established for a scroll oil pump, and the internal flow was simulated by the CFD method. The internal flows at different rotation angles were studied, and the cavitation and pressure pulsation in the scroll pump under different working conditions were analyzed. The results show that the flow in the two working chambers of the scroll pump is asymmetric due to its structural characteristics and motion mode. The high-pressure pulsation occurs in the working chamber during the end of the suction and the beginning of discharge. Under the action of high-pressure difference, there is a high-speed jet in the clearance between the orbiting and fixed scrolls, which causes a large area of cavitation downstream of the clearance. Under a low suction pressure, cavitation intensifies with the increase in rotating speed, which leads to a decrease in volumetric efficiency. It can effectively improve cavitation by increasing the suction pressure and volumetric efficiency of the pump. The pressure pulsation can be effectively improved by increasing the axial clearance and reducing the rotating speed. The method of reducing pressure pulsation by shortening the scroll profile is proposed.

show abstract

Construction and simulation of novel asymmetrical scroll wraps for scroll vacuum pumps

Cited by 8 publications

References 5 publications

An Improved Geometric Theoretical Model and Throughflow Prediction Method for a CO2 Scroll Compressor of Automotive Air Conditioning System

An Improved Geometric Theoretical Model and Throughflow Prediction Method for a CO2 Scroll Compressor of Automotive Air Conditioning System

Numerical calculation of scroll compressor geometry and assessment of its delivery

Internal Flow and Cavitation Analysis of Scroll Oil Pump by CFD Method

Contact Info

Product

Resources

About