冲程

The remainder of the power stroke is an adiabatic expansion.

动力冲程的后段是绝热膨胀过程。

Chain type long stroke pumping unit is mainly used in mid and anaphase oilfield.

链式长冲程抽油机主要是为开采中、后期油田而设计的。

According to the measured pressure data of the four-stroke small utility gasoline engine, the cyclical variations of the maximum pressure, the crank shaft angle at the maximum pressure, the mean indicated pressure and the largest pressure rise rate were analyzed. Meanwhile, the influences of ignition advance angle, load and rotation speed on cyclical variation were also investigated.

根据实测小型通用四冲程汽油机气缸压力，分析了最大爆发压力、最大爆发压力所对应曲轴转角、平均指示压力以及最大压力升高率等参数的循环波动特性，以及点火提前角、负荷和发动机转速对循环波动的影响。

Electronic barke applied to both principal axis and stroke,flexible axis enables the adjustment of synchoronus brake

主轴、冲程均用电子刹车，调整时主轴可自由旋转，可方便地调整到同步刹车。

A mechanical characteristics of rubber transmitting belts in the state of hanging is studied, which are used in driving long-stroke pumping unit.

研究了长冲程抽油机传动胶带悬垂状态下的力学特性，给出了相应的胶带运动微分方程和等效弹性模量的计算公式，为正确地确立长冲程抽油机的有关参量，并实现其各项经济技术指标提供了理论依据。

To achieve high reliability rig build momentum across the company Petroleum Chi Chai attached great importance to develop a detailed implementation plan: first, optimizing the current oil market, the popular 4012-based long-stroke diesel engine supporting 1000kW diesel generating sets to meet our 7000 meters below the oil drilling rig for electric power demand in 2009 in the second half on the market; second, strengthen the 4012 Long-stroke diesel engine, and the supporting 1100kW diesel generator sets, China's oil industry to meet the full demand for electric power drill, the end of 2009 the completion of prototype evaluation.

为实现打造高可靠性钻机动力，中油济柴公司上下高度重视，制定详细的实施计划：第一步，优化目前在油田市场广受欢迎的4012型长冲程柴油机配套的1000kW 柴油发电机组，满足我国石油钻探7000米以下电动钻机对动力的需求，2009年下半年投放市场；第二步，强化4012型长冲程柴油机，配套1100kW 柴油发电机组，全面满足我国石油行业电动钻机动力的需求，2009年年底完成样机评定。

Its products cover: vehicle lubricant (Gasoline Engine Oil, Diesel Engine Oil, General-Purpose Oil for Gasoline and Diesel Engines and Vehicle Gear Oil), auxiliary vehicle product (brake liquid, auto-transmission liquid, lubricating grease, anti-freezing liquid, steering gear oil, shock absorber oil, water tank coolant and glass cleaning liquid), motorcycle lubricant( mobile oils for four-stroke and two-stroke motorcycles, gear oil and disc brake oil), industrial lubricating oil (hydraulic oil series, air compressor oil series, industrial gear oil series, bearing oil scries, textile industrial oil series, heat treatment oil series, metalworking oil and special anti-corrosion oil).

产品系列涵盖：车用润滑油（汽机油、柴机油、汽柴通用机油和车辆齿轮油）；车用辅助产品（刹车液、自动传动液、润滑脂、防冻液、方向机油、减震器油、水箱宝和玻璃清洗液）；摩托车润滑油（四冲程、二冲程摩托车机油、齿轮油和碟刹油）；工业润滑油（液压油系列、压缩机油系列、工业齿轮油系列、轴承油系列、纺织系列用油、热处理用油、金属加工油及特殊防锈油）。

Pumping speed and the length of stroke have greater effect on the loads applied on polished rod, rod string and pump plunger.

4，冲程次数和冲程长度对悬点、杆柱及泵上的载荷影响较大。

Based on the practice of the use of φ95mm subsurface sucker rod pump in Shengtuo Oilfield in recent years, the causes of the failure of the pump are analyzed, and relevant precautions are put forward:(1)selecting oil wells with sufficient fluid supply for pumping;(2)under the condition of the pump efficiency being the same, the submergence depth of the pump being somewhat larger than that of the small pump, and 450～500m being feasible;(3)adopting Grade H ultrahigh-strength rod string and fixing a sinker bar at the bottom of the rod string;(4)selecting long stroke and low pumping speed, and more than 5m stroke and less than 6min-1 pumping speed being recommended;(5)adopting zirconium oxide valve ball and seat ＋ spray welded plunger ＋ nitrided barrel.

根据胜坨油田近几年采用φ95mm有杆抽油泵提液的实践，分析了造成这种抽油泵失效的原因，包括与其配套的脱节器失效、抽油杆断脱、泵漏、电动机不配套和生产管理不善等。为增强泵的提液能力和工作可靠性，提出5 项预防措施：(1)选择有充足供液能力的油井；(2)在保持相同泵效的情况下，泵的沉没度应略大于小泵，推荐按450～500m设计；(3)采用H级超高强度抽油杆柱，并在杆柱底部配置一定重量的加重杆；(4)采用长冲程、低冲次的参数匹配，推荐光杆冲程大于5m，冲次小于6min-1；(5)为提高泵筒、活塞和阀座的防腐耐磨性，推荐采用&氧化锆阀球和阀座+喷焊柱塞+氮化泵筒&的结构形式。

Qualifications:l Qualified as marine- or mechanical engineer, with 2~4 year experience on Casting or welding or machining is preferred;l Basic knowledge is needed on material test, Non-defective test, hardness test; etcl Skilled on component's dimensions/Geometry tolerance measuring;l Sound knowledge of MAN's Four-stroke engines and/or Two-str..

资格要求：l 船用或机械工程师，在铸造、机加工或焊接方面拥有2～4年的工作经验； l 对材料分析、无损探伤和硬度试验等方面掌握了一定的知识；l 能熟练地测量零件的尺寸和型位公差； l 对于MAN的四冲程和/或二冲程柴油机有所了解； l 对于工厂设备有所经验为佳。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。