vent hole

Technological optimization and design of die for vent hole of boarding plate

围板通风孔工艺优化与模具设计

Vent Hole Drilling Plan By Using Hydraulic Drill

用水力钻打通风孔方案设想

The results of this test proved that the reasonable choice of pressure and air vent hole was the critical element for cooing velocity and cooling uniformity .

结果表明，合理地选择压差以及包装箱开孔大小对葡萄的冷却速度、冷却均匀性起着关键的作用。

The vent hole size and the pressure drop are the important parameters which affect cooling rate and cooling uniformity in pressure pre-cooling of fruit and vegetable .

果蔬差压通风预冷包装箱的开孔大小及包装箱两侧的压差是影响预冷速度、冷却均匀性的重要参数。

The methods of inlet channel of laval nozzle and smaller area of vent hole have been put forward to limit the spin rate of turbine generator .

提出选用拉伐尔管式进气道、和较小的排气孔面积的方法来限制涡轮发电机的转速。

It is expounded the characteristics of dust pollution of the area above raw material chute in iron works , as well as an application example of travelling vent hole equipment for dedusting .

叙述了炼铁厂原料矿槽槽上扬尘污染的特点，及移动式除尘通风口装置技术在槽上除尘的应用实例。

The increasement of vent hole size and the pressure drop both shorten the 7 / 8 cooling time in varying degrees . The cooling uniformity is also improved in the same conditions .

增大开孔直径和压差可以不同程度地缩短葡萄的7/8冷却时间、在一定条件下改善冷却均匀性。

It is reasonable for the grape ( carton ) provided in this experiment to choose the vent hole diameter about 28 mm and the pressure drop about 100 Pa , considering the pre-cooling experiment results and other factors .

对于该试验采用的葡萄包装箱，综合考虑预冷速度、冷却均匀性以及预冷后葡萄的温升速度、干耗等因素，开孔直径在28mm左右、压差保持在100Pa左右为宜。

Based on the regression of the relationship between the vent hole and the pressure drop , the shape factor of vent hole " S " has been put forward the first time . The effects of " S " on strawberry precooling rate have also been discussed .

在对孔形与压降关系进行回归分析的基础上，首次定义了开孔形状因子S，并讨论了其对草莓预冷速度的影响。

Based on the former returns and design experience , the following aspects are ameliorated , including the top shape , vent hole , slag runner , spline , button shape , button distribution etc. Then the three-dimensional solid model of physics exploration bit after amelioration is confirmed .

根据前面的研究成果和前人的设计经验，对钻头端面形状、排气孔、排渣槽、花键、齿形、布齿等进行改进设计，并给出改进后的物探钻头三维实体模型。

Driving the plastic drainage board could form the vertical drainage channel , accelerate the vent Of hole water and the concretion of clay , reduce the sedimentation after construction , enhance the load-bearing ability of the foundation .

它可以在软土层中形成竖向排水通道，加速孔隙水的排出和地基固结，减少工后沉降，提高地基土的承载力。

Experiment of the periodical vent of the hole and its analysis

小孔周期性泄流的实验与分析