高效螺杆式CO2制冷压缩机的优化设计

在对螺杆式CO2制冷压缩机的转子进行优化的基础上,对相应的壳体强度、轴承选择、油路布置等进行优化设计,根据优化设计参数制造螺杆式CO2制冷压缩机样机并进行测试。试验结果表明,优化设计后的螺杆式CO2制冷压缩机具有很高的效率及可靠性。     

数码涡旋变容制冷系统冷凝器动态特性分析

针对数码涡旋压缩机的容量调节方式,将冷凝器内部流量的响应规律转化为外部一个变化的流量输入信号,建立数码涡旋变容制冷系统的冷凝器仿真模型;分析了热负荷、出风温度、制冷剂进口压力在不同容量输出下的动态变化特性。结果表明,在容量调节作用下,热负荷、出风温度呈现出周期性波动趋势,但其总体是随容量输出比例的降低而减小;而制冷剂进口压力变化不显著。     

全自动制冷压缩机性能测试试验台的研制

本文介绍了一种第二制冷剂量热器法全自动制冷压缩机性能测试试验台的工作原理,以及在研究过程中为提高试验台的测量精度方面所采用的方法.建成的测试台工况稳定,测试速度快,测量精度高.     

涡旋压缩机涡旋型线的研究现状及展望

涡旋压缩机作为第三代容积式压缩机,具有效率高、能耗低、噪声低、结构紧凑等诸多优点,被广泛应用于制冷空调与气体压缩等方面。由于涡旋压缩机的寿命、加工性能、效率和功耗等都受到涡旋型线的制约,所以涡旋型线的研究是开展涡旋压缩机其他研究的基础和关键。本文总结了国内外相关的研究成果,从型线类型和型线修正两个方面出发,对现有涡旋型线的研究现状进行综述分析,并对未来涡旋型线发展方向和趋势进行预测和展望,对于今后涡旋压缩机型线的研究与工程应用具有指导和借鉴作用。     

R32涡旋式压缩机开发

R32是一种具有巨大应用潜力的制冷剂,但其适用的涡旋式压缩机的开发尚不成熟,尤其是排气温度过高的问题严重影响R32制冷剂的应用。本文指出R32涡旋式压缩机开发的重点与难点,并探讨R32涡旋式压缩机未来的开发方向。     

并联式涡旋压缩机应用实例分析

介绍并联式涡旋压缩机的技术优势，针对并联式涡旋压缩机的特点分析应用实例，提出相关建议。     

涡旋式压缩机中间补气技术

对带有中间补气功能的涡旋式压缩机理论循环进行分析,针对在不同蒸发温度下采用中间补气对涡旋式压缩机的能力、功率、排气温度及能效比的影响进行试验研究与分析。结果显示,与普通涡旋式压缩机相比,带有中间补气功能的压缩机在蒸发温度由-5℃到-20℃之间变化时,其能力提升约15%～30%,能效比提升约9%～19%,功耗仅上升约10%。     

涡旋压缩机隔振器设计

本文从涡旋压缩机安装到空调系统后的整体模态分析着手,综合考虑压缩机本体振动,压缩机启动瞬间吸气管和排气管接口处的振动位移,压缩机传递到底盘的隔振率这4方面的因素,通过理论建模和测试试验的方法,设计了一种新型的分体式隔振器,满足了用户的使用要求,并且在实际使用中减振、降噪效果明显。     

低温冷冻涡旋压缩机可靠性研究

本文通过分析涡旋压缩机在低温冷冻工况下影响其运行可靠性的因素,从结构设计优化及表面处理工艺等方面,提出提高其运行可靠性的多种方法,并通过实验证明了其有效性。     

CO2涡旋式压缩机改进设计

CO2作为一种天然制冷剂,是目前制冷剂替代的一个重点研究方向。本文对CO2制冷循环特点进行介绍,通过对CO2涡旋式压缩机的工作特点和影响泄漏的因素进行分析,提出一种可降低CO2涡旋式压缩机气体泄漏量以及提高能效的方法,并进行试验验证。     

球形压缩机在微型制冷系统中的应用研究

介绍了新发明的球形压缩机的原理及结构特点,分析了其用于微型制冷系统中的优势,分析了球形压缩机密封性可靠效率高的特点。     

Optimization of an oil charge amount on electric driven scroll compressor for eco-friendly vehicle

The purpose of this study is to optimize the amount of oil charge in the electric driven scroll compressor for eco-friendly vehicles. R134a is used as the refrigerant in the vehicle and Polyolester (POE) oil as the compressor oil. The initial amount of oil was increased at 20 g intervals from 40 g to 120 g, and at each initial amount of oil charge, the back pressure is measured at each step of the complex durability test and under each condition of the performance test. Throughout the test, it is found out that the optimum amount of oil is determined by the back pressure, which is 80 g in this test. The performance of a system is compared with pull-down tests in the actual air conditioning system, and the optimum amount of oil was confirmed. A complex durability test was also evaluated and verified for the durability of the compressor with the confirmed amount of oil.     

Two-stage heat pump system with vapor-injected scroll compressor using R410A as a refrigerant

Refrigerant vapor-injection technique has been well justified to improve the performance of systems in refrigeration applications. However, it has not received much attention for air conditioning applications, particularly for air conditioning in hot climates and for heat pumping in cold climates. In this study, the performance of an 11 kW R410A heat pump system with a two-stage vapor-injected scroll compressor was experimentally investigated. The vapor-injected scroll compressor was tested with the cycle options of both flash tank and internal heat exchanger configurations. A cooling capacity gain of around 14% with 4% COP improvement at the ambient temperature of 46.1 °C and about 30% heating capacity improvement with 20% COP gain at the ambient temperature of −17.8 °C were found for the vapor-injected R410A heat pump system as compared to the conventional system which has the same compressor displacement volume.     

Performance of a scroll compressor with vapor-injection and two-stage reciprocating compressor operating under extreme conditions

The current paper presents a comparative study between a scroll compressor with vapor-injection (SCVI) and a two-stage reciprocating compressor (TSRC) operating under extreme conditions. The present work is divided into two parts: in the first part, both compressors are compared in terms of compressor efficiency, volumetric efficiency, coefficient of performance (COP), and cooling capacity with R407C refrigerant; in the second part, the seasonal performances of both compressors working in cooling and heating modes are estimated and analyzed. Results show that the SCVI presents better efficiency and COP than the TSRC for pressure ratios below 7.5. This compressor can be used in air conditioning systems and heat pumps which work under moderate temperature conditions. For higher pressure ratios, the TSRC has better efficiency which subsequently gives higher COP. This type of compressor is more suited to be used in sanitary hot water systems operating in harsh climates and in low-temperature freezing systems (under −20°C).     

Start-up and shut-down operation in a reciprocating compressor refrigeration system with capillary tubes

Refrigerant migration during start-up and shut-down cycles can affect energy losses. Two reciprocating compressor refrigeration systems were studied: (1) a conventional cycle with refrigerant migration through the capillary tube after compressor shut-down and (2) a system in which a magnetic cut-off valve was closed on compressor shut-down. It was found that by preventing the refrigerant from migrating during shut-down, energy losses during start-up could be reduced, resulting in a 4% decrease in motor power input at this time. A computer program has been developed to calculate energy losses due to refrigerant migration.     

涡旋压缩机经济器系统的试验研究

以涡旋压缩机经济器系统为基础研制出适合寒冷地区使用的热泵原型机,试验结果表明,在-10℃～-15℃的低温环境中,该原型机仍具有较高的制热能力和供暖温度,能够满足寒冷地区冬季的采暖要求。通过分析实验结果,找出寒冷地区用热泵机组适宜的运行和设计参数。     

涡旋式压缩机轴向柔性补偿机构设计

介绍涡旋式压缩机轴向柔性补偿机构的原理、设计流程、设计实例以及测试结果，同时针对高压式设计与中压式设计对压缩机运转范围的影响作一比较，为设计者、使用者与有兴趣的读者提供参考。     

含运动副间隙的涡旋压缩机动平衡仿真研究

为了研究运动副间隙对涡旋压缩机动平衡的影响,根据涡旋压缩机机构运动副间隙特点,采用非线性等效弹簧阻尼模型和Coulomb摩擦模型建立考虑摩擦作用的运动副间隙接触碰撞模型,并将其嵌入到ADAMS动力学仿真软件中,建立了含运动副间隙的涡旋压缩机动力学模型,针对小轴防自转机构、间隙大小和间隙数目三种情况,进行了动力学仿真。仿真结果表明：小轴防自转机构、间隙大小和间隙数目对涡旋压缩机的动平衡有显著影响,为合理选用轴承游隙提供了参考,并为提高涡旋压缩机的动力特性提供了理论依据。     

Experimental testing of an oil-flooded hermetic scroll compressor

In this work, a residential air conditioning compressor designed for vapor injection has been modified in order to inject large quantities of oil into the working chamber in order to approach an isothermal compression process. The compressor was tested with oil injection mass flow fractions of up to 45%. At an evaporating temperature of ?10 °C and condensing temperature of 30 °C, the overall isentropic efficiency was up to 70% at the highest oil injection rate. Overall, over the testing envelope investigated, there are no significantly negative effects experienced for the compressor and the compressor isentropic efficiency and refrigerant mass flow rate improve monotonically as the oil injection rate is increased.     

并联涡旋式压缩机油气平衡系统模拟分析及结构优化

采用两相流Eulerian模型对并联涡旋式压缩机油气平衡系统进行CFD模拟分析,得出引起2台压缩机油位差的原因是吸气管到各台压缩机分管路压差的不平衡。为减小2台压缩机的油位差,在其中1台压缩机吸气口端设置限流环,并进行模拟分析及试验验证。结果表明,在压缩机吸气口端设置直径为23 mm的限流环可以使2台压缩机的油位差不大于2 mm,满足并联涡旋式压缩机安全运行要求。