共查询到20条相似文献,搜索用时 631 毫秒
1.
YJ315X型变矩器配套使用的YJ320-01000Z型减压阀,常用在ZL20/30型装载机上。该阀的进油腔与溢流腔采用分腔设计,进油腔与液压泵连接。在减压阀芯的增压孔进油时,减压阀芯与螺塞之间形成高压,推动减压阀芯右移。 相似文献
2.
3.
4.
5.
6.
7.
8.
为了提高高档数控机床的加工精度和稳定性,设计了一种新型的双环形油腔结构。基于流体动力学理论,并采用计算流体动力学(Computational Fluid Dynamics,CFD)数值模拟方法,研究了入口雷诺数对油腔内部流场结构和油腔承载力的影响。结果表明:入口雷诺数对于油腔内部流场结构和油腔承载力均具有重要影响;随着入口雷诺数的增大,油腔中心凹槽内部由单胞对流发展成多胞对流;同时,油腔承载力也相应增加。通过与传统圆形油腔对比发现,在相同入口雷诺数条件下,双环形油腔具有更高的承载力。该研究对设计高档数控机床新型油腔结构、优化油腔几何结构、提高承载力和加工精度有指导意义。 相似文献
9.
振荡油腔位置对柴油机活塞温度场的影响 总被引:3,自引:0,他引:3
针对策柴油机活塞在工况下第一环槽温度过高,导致润滑油结肢的问题,提出了降低热负荷的改进方案,探讨了由活塞振荡冷却油腔上移对活塞温度场带来影响,通过对比振荡冷却油腔上移1~4mm活塞温度场、应力场的变化,分析了采用改变振荡油腔位置来降低活塞第一环槽热负荷方法的可行性,提出了在使用提升振荡冷却油腔的方法来降低活塞热负荷时,对油腔提升高度的控制范围. 相似文献
10.
以TRIZ理论为指导,提出一套基于知识的径向动静压滑动轴承油腔结构创新设计方法:以油腔结构须满足的润滑性能作为设计指导,建立油腔结构设计属性表,总结油腔结构的可创新角度;建立属性表与TRIZ工程参数对应的关联表;利用矛盾矩阵表查找发明原理,结合油腔的可创新角度把高度抽象的发明原理具体化,进而提出轴承油腔结构的创新设计方案。利用该设计方法提出一种六腔结构动静压滑动轴承,通过FLUENT验证,表明在轴径倾斜工况下,与四腔动静压滑动轴承相比其承载力具有优越性。 相似文献
11.
12.
盐水是酱油发酵过程和成品配兑环节中必不可少的原材料之一。目前大部分调味品生产企业的盐水生产还处于人工操作为主的阶段,就如何保证食品卫生安全、提高自动化程度、扩大生产规模,从溶盐和盐水配兑两个模块进行设计及研究。参照固体流态化的机理,在大罐内进行溶盐,溶解出饱和盐水,设计一套盐水自动配兑系统,自动配制出符合生产要求的盐水。 相似文献
13.
14.
采用固相萃取技术测定中国察尔汗盐湖盐水中的有机组分。多孔聚合物吸附剂LC-C18(非极性)和XAD树脂用于萃取盐湖卤水中的有机化合物。通过气相色谱-质谱(GC-MS)鉴定了包括烃、酯、醇、酮以及某些低相对分子质量的含杂原子的有机化合物等多种物质。LC-C18柱和XAD柱萃取萘-D10的平均回收率分别为93%和79%。 相似文献
15.
16.
17.
Jeong-Seek Kang Sung-Kook Cho Shin-Hyoung Kang 《Journal of Mechanical Science and Technology》2002,16(8):1144-1153
A hybrid performance prediction method is proposed in the present study. A channel diffuser is divided into four subregions:
vaneless space, semi-vaneless space, channel, and channel exit region. One-dimensional compressible core flow and boundary
layer calculation of each region with an incidence loss model and empirical correlation of residuary pressure recovery coefficient
of a channel predict the performance of diffusers. Three channel diffusers are designed and tested for validating the developed
prediction method. The pressure distributions from an impeller exit to the channel diffuser exit are measured and discussed
for various operating conditions from choke to nearly surge conditions. The strong non-uniform pressure distribution which
is caused by impeller-diffuser interaction is obtained over the vaneless and semi-vaneless spaces. The predicted performance
shows good agreement with the measured performance of diffusers at a design condition as well as at off-design conditions. 相似文献
18.
《Manufacturing Engineer》2005,84(6):16-19
A key component to success for manufacturers in the global market is effective channel management. Creating a global channel management strategy begins with an overview of the specific country of interest's existing channel structure. Secondary research is critical for planning but the company must not leave their efforts at that level and just launch into a campaign to recruit resellers. They must get to the region or country as often as they can, staying months at a time, visiting each reseller and explaining what their manufacturing's core strengths are and how they fill a void in the existing market. This is only one strategy. In this paper, global channel management is discussed in detail. 相似文献
19.