Modification strategies for the top profile of algebraic spiral scroll compressors with equal-angle and unequal-angle approaches

Effect of channel shape on working process of scroll compressor with pre-discharge valve

Globally, around 15%–20% of all produced electrical energy is used to power compressors due to the constant operation of compressors. Thus, even a slight enhancement in their efficiency can lead to significant reductions in total energy consumption. This present work introduced an analytical model of drive bearing considering gas force models to estimate power loss and friction moment with impact of rotation speed in an electrical scroll compressor by grease lubrication and analyzed the relative effect on the compressor performance. The frictional moment and power losses have been estimated in the case of load independence and dependence following two global models: Harris and Palmgren, in which the power loss due to driving bearing impact is 17.2 and 7.2 W according to the Palmgren and Harris models, respectively, which mean that the Palmgren model and the Harris model suggest that the drive bearing needs 1.4% and 0.6%, respectively, of total power to overcome friction caused. The analysis helps predict power losses and allows designers to achieve a more accurate estimation of the performance of electrical scroll compressors.

Performance prediction modeling of variable cross-section scroll compressor for electric vehicles

For the wide-frequency vibration isolation requirements of 25P large-capacity scroll compressors, this study proposes an improved composite vibration isolation scheme. By analyzing the load transfer mechanism and vibration characteristics of the original isolation system, a dynamic model is established, and multi-stage dynamic tests (vibration, modal, ODS, etc.) are conducted to clarify the vibration source distribution and transfer law, thus constructing the isolation system response theory. An innovative intermediate raft structure is introduced to create a composite system composed of pre-installed and post-installed isolators. The performance is enhanced through finite element optimization and sensitivity analysis. Combined with the MIGA algorithm and surrogate model optimization, experimental verification shows that the improved scheme significantly enhances stability and vibration isolation performance, effectively expanding the vibration control frequency range compared to the traditional system.

Design and experimental study of an oil-free air scroll compressor

A deep domain-adaptive anomaly detection method for scroll compressor speed transfer using domain-adversarial training and attention mechanisms

The first paper in this series describes the global history of scroll compressors (SCs), provides a brief analysis of the advantages of SCs over other compressor types, and defines the operating principle of scroll compressors. The paper presents the basic theoretical construction premises for elements of a scroll compressor based on the Archimedean spiral as a generator and reasons for selecting the Archimedean spiral as a generator. It describes some methods for constructing a spiral pen, including a correction method allowing to construct a mathematical algorithm that describes a way to obtain one generator of a spiral pen in the case where the second generator is an Archimedean spiral. This method allows for a high degree of conformity of compressor elements. The following parts of the study describe a theoretical method for obtaining the second generator of the spiral pen using the principles of differential geometry and the envelope curve method. It allowed to obtain equations describing the external generator of the SC element provided that the internal generator is an Archimedean spiral. The paper discusses methods for joining the ends of the scrolls in the central part of the compressor and determines the relative issues. Further, other methods of scroll profiling based on the Archimedeean curve will be presented. In conclusion, there are a brief overview of existing SC modeling methods and a review of relative publications and main areas and trends in this branch of technology.

Characteristic analysis and dynamic study of a scroll compressor with a combined VHV profile

ABSTRACT Existing fault diagnosis methods typically rely on static-weight attention models, which often produce overconfident predictions. This issue is particularly pronounced in complex machinery, such as scroll compressors, where small-sample conditions exacerbate diagnostic biases caused by such overconfidence. Consequently, both the reliability and accuracy of diagnosis are diminished. To address this problem, this paper proposes a dynamic memory-aware mechanism. Specifically, the method integrates bidirectional Long Short-Term Memory (LSTM) with learnable positional encoding, enhancing the model’s ability to capture temporal sequences effectively. Additionally, an adaptive uncertainty calibration loss function (AdaUCal-Loss) is introduced, which optimises the relationship between predicted confidence and classification accuracy, thereby improving diagnostic robustness. Furthermore, a dynamic memory-aware graph convolutional network model, grounded in uncertainty calibration, is presented. This model incorporates spatial topology, temporal evolution, and probabilistic calibration, collectively enhancing classification accuracy-particularly for boundary-ambiguous samples under small-sample conditions. Experimental results demonstrate that the model achieves an impressive accuracy of 99.19% on a small-sample scroll compressor dataset, outperforming existing methods. Moreover, it shows strong generalisation and diagnostic performance on two publicly available datasets from Xi’an Jiaotong University (XJTU Spurgear and XJTU Gearbox), validating the effectiveness of the proposed approach.

Generation and thermodynamic characterization of an asymmetric scroll compressor for transcritical CO2 heat pump in electric vehicles

Thermodynamics and performance analysis of a combined algebraic spiral CO2 scroll compressor

Water vapor production is an essential process in industrial fields such as dyeing, food processing, and pharmaceutical manufacturing, yet it is characterized by substantial power consumption. Against the backdrop of global carbon neutralization initiatives, high-temperature heat pumps have emerged as a promising alternative to traditional boilers, owing to their environmental friendliness and cost-saving advantages. However, developing and manufacturing such vapor production systems poses significant technical challenges: compressors must withstand extreme high pressures, heat exchangers suffer from low effectiveness during high-temperature condensation, suitable working fluids balancing low evaporation and high condensation temperatures are scarce, and components face issues like heat exchanger incrustation and insufficient compressor lubrication at high discharge temperatures. In this study, a cascade high-temperature heat pump system integrated with a flashing circulation and multi-stage preheating cycle was developed for water vapor production. The system comprises three core cycles: an R134a low-temperature heat pump cycle, an R245fa high-temperature heat pump cycle, and a two-stage preheat-evaporation water cycle. Theoretical simulations were conducted to evaluate component performance (compressors, heat exchangers, etc.) and optimize system parameters. An experimental testbed was constructed with scroll compressors (3.5kW for R134a, 5kW for R245fa) and plate heat exchangers, verifying system reliability under varied operating conditions. Results demonstrate the system efficiently produces 135°C/0.3MPa water vapor, with a Coefficient of Performance (COP) ranging from 2.1 to 3.5. COP increases with evaporation temperature and decreases with condensation temperature, with an optimal intermediate-stage temperature of 70–75°C. This system proves to be an efficient, eco-friendly industrial alternative to conventional boilers.

Texture design for improving the tribological performance of scroll compressors based on multi friction pair modeling

The scroll compressor serves as a pivotal component in compressed air energy storage (CAES) systems, where a comprehensive understanding of transient flow properties is imperative for optimizing structural design and enhancing compression efficiency. In this study, a numerical computational method is developed to investigate the dynamic flow behaviors of a scroll compressor within in a CAES framework. Furthermore, the influence of pressure ratio on air compression and energy storage performance is also analyzed. The computational results reveal that the pressure distribution within the compression chamber is homogeneous, accompanied by rapid air diffusion. In contrast, the velocity distribution exhibits significant spatial variations, with pronounced unevenness intensifying as the compression process progresses. Notably, the vortices and fluctuations in airflow are intensified in regions with steep pressure gradients. The temperature distribution is influenced by both pressure and velocity, leading to a higher temperature observed in the central compression chamber. Moreover, promotion of the pressure ratio results in a substantial increase in energy storage capacity where the energy storage capacity per unit volume of air is improved by 63.7% as pressure ratio increases to 5. While the instability of flow in compression chamber is enhanced, and the maximum temperature is promoted which may pose a risk of overheating, reducing the system operation stability and thermal efficiency. Thus, the structure of the scroll compression and its operation conditions can be optimized based on the analysis of flow details, ultimately aiming to improve system efficiency and reduce thermal losses.

Injection performance analysis of scroll compressors with varying spiral turn configurations for electric vehicle applications: An experimental approach

Nonlinear dynamics and vibration mechanisms in air scroll compressors: A study on orbiting and fixed scroll pair

Numerical analysis of scroll compressor with combined profiles and intermediate discharge valve

Experimental study of a retrofitted scroll compressor for operation with two-phase refrigerant flows

Testing and characterisation of a scroll compressor with vapour injection using R454C as a drop in refrigerant in a water source heat pump