5 o6 P! R4 ]# i* T8 Q$ _对于一台泵的转速，实际上是有限制的，这主要取决于工艺流体，如果传送的是油类，泵则能以很高的速度转动，但当流体是一种高粘度的聚合物熔体时，这种限制就会大幅度降低。 $ _5 w# w# @; J- ^5 k- |9 @) ]4 X推动高粘流体进入吸入口一侧的两齿空间是非常重要的，如果这一空间没有填充满，则泵就不能排出准确的流量，所以PV值(压力×流速)也是另外一个限制因素，而且是一个工艺变量。由于这些限制，齿轮泵制造商将提供一系列产品，即不同的规格及排量(每转一周所排出的量)。这些泵将与具体的应用工艺相配合，以使系统能力及价格达到最优。 " B2 ~# ~. _1 E 2 s [3 m' O: [- C7 `PEP－II泵的齿轮与轴共为一体，采用通体淬硬工艺，可获得更长的工作寿命。“D”型轴承结合了强制润滑机理，使聚合物经轴承表面，并返回到泵的进口侧，以确保旋转轴的有效润滑。这一特性减少了聚合物滞留并降解的可能性。精密加工的泵体可使“D”型轴承与齿轮轴精确配合，确保齿轮轴不偏心，以防齿轮磨损。Parkool密封结构与聚四氟唇型密封共同构成水冷密封。这种密封实际上并不接触轴的表面，它的密封原理是将聚合物冷却到半熔融状态而形成自密封。也可以采用Rheoseal密封，它在轴封内表上加工有反向螺旋槽，可使聚合物被反压回到进口。为便于安装，制造商设计了一个环形螺栓安装面，以使与其它设备的法兰安装相配合，这使得筒形法兰的制造更容易。 0 j' w D6 Z" R% ^ # t' P/ A+ Z! o uPEP－II齿轮泵带有与泵的规格相匹配的加热元件，可供用户选配，这可保证快速加温和热量控制。与泵体内加热方式不同，这些元件的损坏只限于一个板子上，与整个泵无关。 " v. b% q/ }( V0 r9 e- ~ ! P7 w \6 q0 {. v* l6 ^齿轮泵由一个独立的电机驱动，可有效地阻断上游的压力脉动及流量波动。在齿轮泵出口处的压力脉动可以控制在1％以内。在挤出生产线上采用一台齿轮泵，可以提高流量输出速度，减少物料在挤出机内的剪切及驻留时间，降低挤塑温度及压力脉动以提高生产率及产品质量。 : y3 q( r" [( v' vThe concept of gear pump is very simple, that it is two of the most basic form of the same size gear in a close co-operation of mutual engagement with the rotating shell, the shell's internal similar "8" shape, the two gears mounted inside , the diameter of gear and work closely with both sides and shell. From the extruder the material inhaled into the mouth of two intermediate gears, and full of the space, with the teeth along the shell of the rotary movement, the final two hours from the meshing teeth. : O& T7 T$ c, R! \2 B
& f& F7 `7 d* y& m5 j7 xSpeaking in terms of gear, also known as positive displacement pump device, that is, inside the cylinder like a piston, when a tooth to another tooth space of the fluid, the liquid was squeezed mechanically to row out. Because the liquid is incompressible, so the liquid and the tooth at the same time will not be able to occupy the same space, so that the liquid has been ruled out. Because of the constant mesh gear, this phenomenon occurs on a row and, therefore, the pump provides a continuous export to exclude the amount of a turn each pump, the volume of discharge is the same. With the continuous rotation of the driveshaft, pump fluid is continuously discharged. Pump flow directly to the speed of the pump. ) q& f! V X, b i
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In fact, there is little pump of the fluid loss, which makes the operation of pumps can not achieve 100% efficiency, as these fluids are used to on both sides of bearing and gear lubrication, and the pump body is also not possible with no gap, it can not be so that 100% of fluid discharged from the export, so a small amount of fluid loss is inevitable. However, a good pump can be run out of material for the majority, will still be able to achieve 93% ~ 98% efficiency. $ r. _& D5 j" z$ y. O% N- s y
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For the viscosity or density change in the process fluid, the pump will not be affected too much. If there is a damper, for example, in the export side, one row or a limiter filter, pumps will push fluid through them. If the damper changes in their work, that is, if the filters become dirty, blocked, or limiter on the back of the hypertension, the pump will maintain a constant flow, until the device in the weakest parts of the mechanical limit (usually equipped with a torque limiter). 3 r8 D! b! h8 p% V2 i$ D- h- g/ p) f. @
For a pump speed, in fact, there are restrictions, which mainly depends on the process fluid, if the transmission is oil, pump can rotate at high speed, but when the fluid is a high viscosity of the polymer melt, such restrictions will be significantly reduced. # ?" R* m$ g; m" D
Promote blood flow into the intake side of the two tooth space is very important, if not fill in this space is full, the pump will not be able to discharge the flow of accurate, so the value of PV (pressure × velocity) is also a limiting factor, and is a process variable. As a result of these restrictions, gear pump manufacturers will provide a range of products, that is, different specifications and emission (per week to the emission of volume). These pumps will fit the specific application of technology to enable the system to achieve optimal capacity and price. - Q9 Y1 C$ h2 n) U% c' g* N+ J: }# a$ ?5 S
PEP-II pump shaft gear and a total of one species hardened using technology, will be a longer working life. "D"-type bearing a combination of forced lubrication mechanism, so that the polymer surface by the bearing, and return to the import side of pump to ensure effective lubrication of the rotation axis. This feature reduces the degradation of polymers and the possibility of being stranded. Precision machining of the pump body can "D"-type gear shaft with precision bearings to ensure non-eccentric gear shaft to prevent gear wear. Structure and Parkool PTFE sealing lip sealed water-cooled sealed together. This shaft seal does not actually contact the surface, it is the principle of the sealing polymer to a semi-molten state cooling and the formation of self-sealing. Can also be used Rheoseal sealing, seal it inside the table are reverse spiral groove processing, the polymer can be imported back to the anti-pressure. In order to facilitate the installation, the manufacturer has designed the installation of a ring bolt, so that the flange and install other equipment line, which makes the manufacture of tube flange easier. 1 d1 Y5 M' @1 H& I5 l/ A5 s; a/ N Y1 I, z# k5 Q, A' F
PEP-II with a gear pump with the pump to match the specifications of the heating elements for the user matching, which ensures rapid heating and heat control. Heating the body and pump in different ways, the damage to these components is limited to a board, the pump has nothing to do with the whole. ( M/ S2 @: ^9 Y- \3 _7 k/ `; E1 ~. @# @2 d. [
Gear pump by an independent motor drive, to be effective in blocking the upper reaches of the pressure pulsation and flow fluctuations. Gear pump in the outlet of the pressure fluctuation can be controlled within 1%. In the extrusion production line using a gear pump, can increase the output flow rate of material in the extruder to reduce the shear and residence time to reduce the extrusion temperature and pressure fluctuation in order to enhance productivity and product quality作者: f13995741325 时间: 2011-5-22 21:33
刷点粉，好下载，谢谢楼主作者: f13995741325 时间: 2011-5-22 21:40
谢谢楼主，刷点分，下载作者: f13995741325 时间: 2011-5-22 21:42
非常感谢，太好了。太好了 * k. |: k! k' U; q' h0 k& B作者: yncxljh 时间: 2011-5-23 00:05
很偏很实用，难得的是全面作者: thq520 时间: 2011-5-25 16:10
顶一个额的乳房让我去作者: thq520 时间: 2011-5-25 16:12
恶搞vfregsegbvdsvb 四分卫作者: thq5201 时间: 2011-5-25 16:38
为服务全国范围广泛去作者: thq5203 时间: 2011-5-25 19:07
多少v打工v恶搞v耳光 作者: thq5203 时间: 2011-5-25 19:10
额叶玩个人格侮辱个人公园因为作者: thq5203 时间: 2011-5-25 19:13
如同忽然特热uheyh 天河作者: thq520 时间: 2011-5-27 13:06
火热而呵呵呵呵发货别人给后人作者: thq520 时间: 2011-5-27 13:09
会被对方不能够和你分工不很多人作者: thq520 时间: 2011-5-27 13:12
翡翠台工程已覅法规股作者: thq5201 时间: 2011-5-27 13:22
地反复放不放过不好看来今年作者: thq5201 时间: 2011-5-27 13:24
风大哥大哥大个人各地作者: thq5201 时间: 2011-5-27 13:26
热天gear个阿哥啊发的噶大概作者: 岁月催人老。 时间: 2011-11-30 18:43
不错 、、、顶作者: xitwxd 时间: 2012-3-1 11:59
好 作者: 森林木BB 时间: 2012-3-2 21:38
发个图先看看多好啊，威望太少了，不敢下作者: 雨下春田 时间: 2012-4-8 19:48
················真是好东西啊作者: 雨下春田 时间: 2012-4-8 19:49
....................威望点不够啊作者: sunbaojun 时间: 2012-4-24 15:58
好东西 喜欢 有用作者: ly04320432 时间: 2012-4-24 16:51
资料真的很好，谢谢分享！作者: 伱、ωǒ蘾尐侅 时间: 2012-4-26 15:14
下来学习~~~作者: sunbaojun 时间: 2012-4-27 22:04
好东西作者: sunbaojun 时间: 2012-4-27 22:04
很有用作者: 1127019887 时间: 2012-5-2 13:46
楼主我只想对一句话，为什么我的眼中常含泪水，因为我爱你爱的深沉。 3 [2 z8 d3 C, J作者: sunbaojun 时间: 2012-5-16 10:32
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====作者: 冷月划痕 时间: 2012-5-20 23:43
好东东呀 作者: 冷月划痕 时间: 2012-5-20 23:43
嗯 不错不错 作者: 冷月划痕 时间: 2012-5-21 18:01
哈哈 感谢楼主奉献作者: 冷月划痕 时间: 2012-5-21 18:01
在网上找了好久，又没有维普等文献下载金币，这里找到了，谢谢，太全面了作者: 冷月划痕 时间: 2012-5-21 21:36
好东西 嘿嘿作者: 冷月划痕 时间: 2012-5-21 21:37
非常好的东西作者: 小丑鱼莫仔 时间: 2012-5-27 12:29
谢谢楼主分享，最近在做UG课程设计，需要机械图纸建模啊作者: aa5221608 时间: 2012-6-4 23:02
我威望不够 能不能帮我下下 我想看看 麻烦大家作者: fredpeng 时间: 2012-6-11 16:49
楼主太帅了作者: jrhjrm 时间: 2012-8-7 22:04
非常好，感谢楼主