/ O2 f3 q0 U( w, b2 s對于粘度或密度在工藝中有變化的流體，這種泵不會受到太多影響。如果有一個阻尼器，比如在排出口側(cè)放一個濾網(wǎng)或一個限制器，泵則會推動流體通過它們。如果這個阻尼器在工作中變化，亦即如果濾網(wǎng)變臟、堵塞了，或限制器的背壓升高了，則泵仍將保持恒定的流量，直至達(dá)到裝置中最弱的部件的機(jī)械極限(通常裝有一個扭矩限制器)。 * a' Z+ `, i- I$ k& N y- g * }, P0 Z& O9 f8 N6 l" d對于一臺泵的轉(zhuǎn)速，實(shí)際上是有限制的，這主要取決于工藝流體，如果傳送的是油類，泵則能以很高的速度轉(zhuǎn)動，但當(dāng)流體是一種高粘度的聚合物熔體時，這種限制就會大幅度降低。 & L: Q/ r5 F+ j( _( U: |推動高粘流體進(jìn)入吸入口一側(cè)的兩齒空間是非常重要的，如果這一空間沒有填充滿，則泵就不能排出準(zhǔn)確的流量，所以PV值(壓力×流速)也是另外一個限制因素，而且是一個工藝變量。由于這些限制，齒輪泵制造商將提供一系列產(chǎn)品，即不同的規(guī)格及排量(每轉(zhuǎn)一周所排出的量)。這些泵將與具體的應(yīng)用工藝相配合，以使系統(tǒng)能力及價(jià)格達(dá)到最優(yōu)。 , g) r* W& T ~- C
) e4 }$ G3 r: y; j+ ~6 x D
PEP－II泵的齒輪與軸共為一體，采用通體淬硬工藝，可獲得更長的工作壽命。“D”型軸承結(jié)合了強(qiáng)制潤滑機(jī)理，使聚合物經(jīng)軸承表面，并返回到泵的進(jìn)口側(cè)，以確保旋轉(zhuǎn)軸的有效潤滑。這一特性減少了聚合物滯留并降解的可能性。精密加工的泵體可使“D”型軸承與齒輪軸精確配合，確保齒輪軸不偏心，以防齒輪磨損。Parkool密封結(jié)構(gòu)與聚四氟唇型密封共同構(gòu)成水冷密封。這種密封實(shí)際上并不接觸軸的表面，它的密封原理是將聚合物冷卻到半熔融狀態(tài)而形成自密封。也可以采用Rheoseal密封，它在軸封內(nèi)表上加工有反向螺旋槽，可使聚合物被反壓回到進(jìn)口。為便于安裝，制造商設(shè)計(jì)了一個環(huán)形螺栓安裝面，以使與其它設(shè)備的法蘭安裝相配合，這使得筒形法蘭的制造更容易。 # b# v: m" ]- J 5 O7 r- p2 }8 K9 jPEP－II齒輪泵帶有與泵的規(guī)格相匹配的加熱元件，可供用戶選配，這可保證快速加溫和熱量控制。與泵體內(nèi)加熱方式不同，這些元件的損壞只限于一個板子上，與整個泵無關(guān)。 * W5 \. _# r5 ^5 Y
+ V$ b9 ?: d4 e" F4 W4 G; q齒輪泵由一個獨(dú)立的電機(jī)驅(qū)動，可有效地阻斷上游的壓力脈動及流量波動。在齒輪泵出口處的壓力脈動可以控制在1％以內(nèi)。在擠出生產(chǎn)線上采用一臺齒輪泵，可以提高流量輸出速度，減少物料在擠出機(jī)內(nèi)的剪切及駐留時間，降低擠塑溫度及壓力脈動以提高生產(chǎn)率及產(chǎn)品質(zhì)量。) [# j& u3 C' W0 X
The 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. 8 A+ W8 m1 s4 \; t" l2 |8 j - z. k3 M4 u# cSpeaking 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. 2 v3 H z* u- z) T# j U
) t4 R& m: i" F, @9 ^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. ; P6 i7 J0 p) s: w; o% q
6 |* h3 A J4 R, W! X' |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). & N- a) g9 a% B% `: ?/ s 9 X' ]" g% F9 E7 f, z; w4 `% }' q9 n$ yFor 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. 4 A) n9 U; `- v# F) n$ TPromote 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. - n8 ]8 ?% R% L! U. j, b/ q4 s0 T* C3 |1 i7 E; _) o& F) Z2 a$ R
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. $ x$ F7 d Z) ?7 U" `
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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. ( F. ?* t4 I$ B; p8 s5 q _9 B6 Q7 y* hGear 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 時間: 2011-5-22 21:33
刷點(diǎn)粉，好下載，謝謝樓主作者: f13995741325 時間: 2011-5-22 21:40
謝謝樓主，刷點(diǎn)分，下載作者: f13995741325 時間: 2011-5-22 21:42
非常感謝，太好了。太好了 , ~ n* z+ V" k& E3 i3 t# A作者: yncxljh 時間: 2011-5-23 00:05
很偏很實(shí)用，難得的是全面作者: thq520 時間: 2011-5-25 16:10
頂一個額的乳房讓我去作者: thq520 時間: 2011-5-25 16:12
惡搞vfregsegbvdsvb 四分衛(wèi)作者: thq5201 時間: 2011-5-25 16:38
為服務(wù)全國范圍廣泛去作者: thq5203 時間: 2011-5-25 19:07
多少v打工v惡搞v耳光 作者: thq5203 時間: 2011-5-25 19:10
額葉玩?zhèn)€人格侮辱個人公園因?yàn)?hr noshade size="2" width="100%" color="#808080">
作者: thq5203 時間: 2011-5-25 19:13
如同忽然特?zé)醬heyh 天河作者: thq520 時間: 2011-5-27 13:06
火熱而呵呵呵呵發(fā)貨別人給后人作者: thq520 時間: 2011-5-27 13:09
會被對方不能夠和你分工不很多人作者: thq520 時間: 2011-5-27 13:12
翡翠臺工程已覅法規(guī)股作者: thq5201 時間: 2011-5-27 13:22
地反復(fù)放不放過不好看來今年作者: thq5201 時間: 2011-5-27 13:24
風(fēng)大哥大哥大個人各地作者: thq5201 時間: 2011-5-27 13:26
熱天gear個阿哥啊發(fā)的噶大概作者: 歲月催人老。 時間: 2011-11-30 18:43
不錯 、、、頂作者: xitwxd 時間: 2012-3-1 11:59
好 作者: 森林木BB 時間: 2012-3-2 21:38
發(fā)個圖先看看多好啊，威望太少了，不敢下作者: 雨下春田 時間: 2012-4-8 19:48
················真是好東西啊作者: 雨下春田 時間: 2012-4-8 19:49
....................威望點(diǎn)不夠啊作者: sunbaojun 時間: 2012-4-24 15:58
好東西 喜歡 有用作者: ly04320432 時間: 2012-4-24 16:51
資料真的很好，謝謝分享！作者: 伱、ωǒ蘾尐侅 時間: 2012-4-26 15:14
下來學(xué)習(xí)~~~作者: sunbaojun 時間: 2012-4-27 22:04
好東西作者: sunbaojun 時間: 2012-4-27 22:04
很有用作者: 1127019887 時間: 2012-5-2 13:46
樓主我只想對一句話，為什么我的眼中常含淚水，因?yàn)槲覑勰銗鄣纳畛痢?br />
; e# X! B0 g) ^0 k. A( g1 W作者: sunbaojun 時間: 2012-5-16 10:32
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====作者: 冷月劃痕 時間: 2012-5-20 23:43
好東東呀 作者: 冷月劃痕 時間: 2012-5-20 23:43
嗯 不錯不錯 作者: 冷月劃痕 時間: 2012-5-21 18:01
哈哈 感謝樓主奉獻(xiàn)作者: 冷月劃痕 時間: 2012-5-21 18:01
在網(wǎng)上找了好久，又沒有維普等文獻(xiàn)下載金幣，這里找到了，謝謝，太全面了作者: 冷月劃痕 時間: 2012-5-21 21:36
好東西 嘿嘿作者: 冷月劃痕 時間: 2012-5-21 21:37
非常好的東西作者: 小丑魚莫仔 時間: 2012-5-27 12:29
謝謝樓主分享，最近在做UG課程設(shè)計(jì)，需要機(jī)械圖紙建模啊作者: aa5221608 時間: 2012-6-4 23:02
我威望不夠 能不能幫我下下 我想看看 麻煩大家作者: fredpeng 時間: 2012-6-11 16:49
樓主太帥了作者: jrhjrm 時間: 2012-8-7 22:04
非常好，感謝樓主