共查询到20条相似文献,搜索用时 156 毫秒
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我国引进扫路车技术已有20余年,各方面的技术已趋向于成熟.但是从整体来看,国产车的清扫性能还不太理想,而目前进口车价格昂贵,且不太适合我国国情.在此形式下,结合国内外的清扫车技术,对清扫车的吸尘原理进行了深入的分析,并进行了风压、风量等参数与清扫性能的关系实验,积累了大量的实验数据,研制出了QSJ28型道路清扫机. 相似文献
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张启明 《筑路机械与施工机械化》2008,25(8)
从国内清扫车的发展现状着手,给出了国内各主要生产厂家清扫车的主要性能参数;对清扫车的总体构造进行了介绍;并从垃圾尘粒吸送原理和除尘原理2个方面对清扫车的工作原理进行了研究;最后给出了中国路面清扫车的发展方向。 相似文献
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介绍最近开发的一种简易实用的电动清扫车。该车与传统清扫车相比实现了多个创新,样车测试效果良好,可满足用户对清扫车作业效率高、节能环保、经济、维护简单等方面的要求。 相似文献
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国外路面清扫车概况 总被引:2,自引:0,他引:2
谢立杨 《筑路机械与施工机械化》1991,8(6):2-5
清扫车是高等级路面养护必备的设备之一.本文通过对国外路面清扫车概况的评述,着重介绍了真空式吸扫式清扫车工作装置的布置、风机的联动及除尘设备等关键部分的结构特点和性能参数. 相似文献
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本文在分析了插电式混合动力清扫车工作原理的基础上,提出了基于整车性能要求的混合动力清扫车动力电池匹配计算方法。 相似文献
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《JSAE Review》1994,15(3):229-233
A novel detector of breath alcohol for a driver has been developed. The detector has three features. A mouth piece is not required because driver's breath is introduced to the detector by a suction pump. The influence of fluctuations of driver's breath flow is extremely reduced by the calibration of alcohol concentration using a humidity change. The detector is able to measure breath alcohol concentration rapidly, and the measurement time is about 2 to 3 seconds. The excellent performance have been demonstrated both in breath alcohol simulation tests and in a drunken persons test. 相似文献
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该文针对多种约束性条件下的大型泵站前池流态,通过建立紊流不可压缩流体的速度场模型及多方案的水力模型,运用有限体积法计算并分析了增设导流锥、导流墩对前池及吸水池流场的改善情况。数值模拟的计算结果表明,增加导流锥后,喇叭口下方水泵进水偏流角一般均小于4°,对改善进泵偏流效果显著;事故工况时,单侧吸水池的水泵平均流量偏差比由26.89%降低至13.26%,吸水管附近水流比较平顺、均匀。水力模型试验表明,泵站前池的八字形导流墩方案可有效地消除存在的大范围回流区和斜向流,并通过调整配水孔口的分流比加强导流作用;导流墩整流方案配水渠至前池末端最大水位落差为0.020m,满足设计方所提出的水力设计要求。 相似文献
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通过对吸扫式扫路车吸嘴口气流状态以及速度测试的分析,在不增加制造和使用成本的前提下,对吸嘴内部结构进行了优化设计,增大了吸力,提高了吸扫式扫路车的扫净率。 相似文献
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Gerotor pumps are widely used in the automotive industry for engine oil lubrication, due to their high volumetric efficiency
and smooth pumping action. In many cases, the lubricating oil from the sump is mixed with contaminants, such as dust and tiny
solid particles, or becomes thickened, due to aging. These problems will lead to critical situations, such as increased noise,
enhanced wear and erosion, and poor lubrication of the engine. These critical situations were studied by conducting a detailed
CFD integrated investigation on a gerotor pump’s performance at different operating conditions in three phases, and the results
are presented in this paper. In first phase, a CFD model of a gerotor pump was developed with a dynamic mesh for the rotary
movement of both the inner and outer rotors. The effects on pump flow rate of important parameters, such as rotor speed, fluid
viscosity and number of ports, were simulated using non-contaminated oil at room temperature and an elevated temperature of
140oC. The relationship between flow rate and pressure at different rotor speeds was predicted and validated with test data
for further parametric study. The pressure ripples at different time steps were measured at different angular positions of
the rotors to examine the model accuracy. It was found that the flow rate increased and pressure pulsation, as well as flow
recirculation, was reduced when ports were added to the cover plate. A suction pipe with a strainer was added for the second
phase to capture the undesired changes in flow behavior, such as cavitation, which is caused by negative suction at the inlet
region of pump. A suitable size for the inlet suction pipe for this pump was chosen after performing tests to characterize
the flow behavior with single and double ports. Next, the relationship between pressure drop and strainer porosity was determined
using different porosity values for the strainers. In the final phase, oil with different concentrations of solids was simulated
to measure the effect of solid particles on flow rates and pressure losses. It was observed that the intensity of the recirculation
was reduced at the suction end at the higher concentration of 0.04%, due to particle inertial effects. It was also found that
particle size distribution affected the overall efficiency and pressure head of the pump. 相似文献
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针对VDR模型中慢启动规则存在不尽周严的地方并考虑车辆的相对运动情况,提出了考虑车流实际运行状态的一维元胞自动机模型。数值模拟表明,新模型能更好地描述实际车流的运行状态,并达到更高的路段平均速度和流量,而且避免了VDR模型中的不合理停车,使车辆在路段上分布更加均匀。 相似文献
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对清华东路与双清路丁字交叉口上下班高峰期的机动车、非机动车和行人流量及信号灯配时进行调查,针对该交叉口存在的道路过窄、信号灯配时不合理、非机动车及行人流量大、道路标志标线不明确等问题进行分析,提出拓宽道路宽度、增加非机动车车道、对信号灯配时相位进行优化等方案,最后运用Synchro仿真软件对改造前后的交叉口进行模拟仿真,模拟仿真结果表明改善方案可行。 相似文献
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对压实土进行不同含水率直剪试验,得到其抗剪强度;利用接触滤纸法测量土基质吸力,得到其土水特征曲线;基于吸引力强度理论,探讨了在最优含水率附近的重塑土的基质吸力、黏聚力与含水率的关系。研究表明:基质吸力与含水率的关系曲线呈内凹双曲线形态,与含水率关系是单调递减的;黏聚力与含水率的关系曲线呈抛物线型,且在最优含水率处最大;转化率随基质吸力的增加而逐渐降低,高基质吸力下土体含水率偏低,基质吸力难以有效转化为吸应力,故而黏聚力偏小。 相似文献