3520造纸机压榨部液压阀站设计【7张CAD图纸+文档全套】
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Drying Cylinder or aper aking achineABATRACT:The disclosure concerns a drying cylinder for a paper making machine. The drying cylinder is hollow and is circumferentially grooved along the length of its inner surface. A plurality of collector conduits extend axially along the casing. Suction pipes project from each collector into respective ones of the grooves for sucking condensate therefrom. A siphon pipe is connected to each collector for siphoning off the collected condensate. The siphon pipe is insulated to reduce the temperature differential between the interior and exterior thereof. The suction pipes are shaped and/or spaced so that the suction pipes are able to remove a greater amount of condensate from the grooves in the vicinity of the siphon pipe than from the grooves in the remainder of the length of the casing, for attaining more uniform drying performance by the drying cylinder across the width of the web. For example, the suction pipes in the vicinity of the siphon pipe may have a greater diameter or there may be a greater concentration of suction pipes in that vicinityKEYWORDS:drying cylinder,design, condensate , siphon pipe1 DRYING CYLINDER FOR PAPER MAKING MACHINE1.1 BACKGROUND OF THE INVENTIONThe invention relates to a drying cylinder for a paper making machine, or the like, and more particularly to means for attaining uniform drying across the width of the web being dried.The cylinder includes a casing which is grooved on its inner surface and includes a siphoning arrangement provided inside the cylinder for extracting condensate from the grooves in the casing. The siphoning arrangement generally includes a number of elements, now described. At the points at which the condensation gathers, namely, at the peripheral grooves in the cylinder casing, small suction pipes are provided. These project into the peripheral grooves. Axially extending condensate collectors located inside the casing are connected to the many small suction pipes for receiving the condensate therefrom. The condensate collectors are, in turn, connected to siphon pipes which generally extend substantially radially of the casing. The siphon pipes, in turn, lead to an axially extending main condensate drainage lineDespite numerous improvements in paper making machines, and in particular in the drying sections of the paper making machines, there has been a continuous problem that, viewed across its w idth, the paper web is unevenly damp (or unevenly dry). Particularly with large drying cylinders for producing lightweight crepe paper, the evenness of the drying over the whole length of the cylinder is decisive for the quality and quantity of the paper. Relatively small variations in the drying condition of the paper web produce very disadvantagenus effects in its quality.Improving the quality of paper produced in a paper making machine has been a prime concern of modern research in connection with paper making machines. The evenness of the drying profile of the paper web has been the subject of repeated research efforts. This research has been difficult since there are a number of sources of disturbance which cause a poor drying profile. The following possibilities should be noted. Moisture which is present at certain points in the paper web can be drawn in from the wet part. This may thus be attributed to faults in the head box of the paper making machine, for example, a bowed delivery lip, faults in the press section, faults in the wet felt web, blocked holes in a suction pressure roller, faults in the spraying pipes, etc. Furthermore, there may also be faulty operation of the hot air cowl. Cambering faults in a pressure roller may cause uneven drying. All these disturbance factors have been investigated and at least partially eliminated. Complete elimination of all drying irregularities has not been achieved up to the present time.1.2 SUMMARY OF THE INVENTIONAn object of this invention is to provide a drying cylinder for paper making machines, or the like, for producing in the paper web a more even drying profile than was previously obtainable.A further object of the invention is to remove a greater amount of condensate from the region in the casing wherein the greater amount of condensate is likely to gather.According to the invention, the drying cylinder is designed to adapt the drying performance in the vicinity of the siphon pipes, i.e., the pipes which extend radially from the outside of the casing inwardly, to the drying performance in the remaining area along the length of the cylinder casing.The invention is based on the following realization.Until now, it has been supposed that the entire siphoning arrangement, with all its parts, uniformly removes the condensate from the individual grooves, provided that the geometric conditions are the same for all the small suction pipes in the grooves. The exchange of heat between the inner space in the cylinder and the siphoning arrangement has also been taken into account, but it has been established that very small amounts of heat are involved, measured against the total consumption of heat for drying. Furthermore, it has always been assumed that this exchange of heat is evenly distributed over the length of the cylindex, since the condensate collectors extend over the whole length of the cylinder. However, the inventor realized that siphon pipes ,which have relatively large diameters, swear to a particularly high degree on their external surfaces. This may be attributed to the fact that, as a result of the pressure difference between the insides and the outsides，of the siphon nines, there is an increased temperature condensate of the vapor being deposited on the external surfaces of the individual siphon pipes. The increased condensate on the siphon pipes passes into those peripheral grooves in the cylinder casing which, viewed in a longitudinal section of the cylinder casing, are located in the vicinity of these large siphon pipes. As a result,the level of condensate in those few peripheral grooves is relatively high. This explains the lack of drying performance in this region of the cylinder, so that at this point, the web remains damp. This is manifested as damp stripes of the web. There are numerous possibilities for realizing the measures for raising the drying performance at the localion of the siphon pipes to a standard level. One of these possibilities comprises insulating the siphon pipes, which connect the collectors to the axial main condensate drainage line or to a hollow shaft, respectively,from the exchange of heat from the outside of the siphon pipes inwards, to thereby reduce the amount of condensation occurring in the form of sweating on the external surfaces of the siphon pipes. This amount of condensation is proportional to the coefficient of heat transmission of the pipe walls. With relatively little outlay, the coefficient of heat transfer of the siphon pipes can be reduced to from 1/10 to 1/100 of the level when the siphon pipes are uninsulated, so that the quanlily of condensate deposited is reduced to technically insignificant amounts.If further measures are used to ensure that no vapor condenses out in an uncontrolled manner in the remaining area of the cylinder, and to ensure that sufficient uniformity prevails over the length of the cylinder, then the same evenness of drying of the paper web is obtained over its width as would be obtained with a cylinder having a smooth internal wall. (A smooth wall cylinder has a lower drying capacity than a grooved wall cylinder). The higher drying capacity of the grooved cylinder can be fully exploited to increase paper production only after even drying has been achieved.According to another feature of the invention, the siphon pipes are provided with insulating coverings on their external surfaces between the collectors, which extend along the axial dimension of the cylinder casing, and the axial drainage line. This is expedient since, with an insulating layer inside the pipe, there would be a risk of erosion of the laver due to the high flow speeds.According to a further feature of the invention, the insulating covering is formed of a high-polymer material, such as rubber, polyamide or Teflon (trademark), in the form of tubes or glued-on fleece. The tube can be pressed and sealed against the pipe by using special devices at its two ends.According to another preferred embodiment,the entire insulating covering on each siphon pipe is supported externally by a supporting casing which is preferabley comprised of metal. This casing may wall or be perforated, or it may be made as round or flat material.As a further embodiment of the invention, the siphon pipes are double-walled for defining an annular insulating space, which is sealed as hermetically as possible from the outside and from the inside. The insulating space preferably contains only gas, although it may also contain fluid substances such as oil or powdered or fibrous insulating material。As mentioned above, the disturbance factors which are responsible for the occurrence of damp stripes in the paper web are numerous. Moreover, viewed across the width of the paper web, the disturbance factors are hard to localize. Although the damp stripes have specific positions across the width of the iveb, it cannot be determined from this which disturbance factors are causing the under-drying. For example, two disturbance factors may be responsible- for the same damp stripe. It will thus be appreciated how hard it was for the inventor to pinpoint the further disturbance factor of the excessive formation of condensate on the siphonpipes.Other objects and features of the invention will now be explained with reference to the accompanying drawing.2 BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 shows an internally grooved drying cylinder in longitudinal section, which is provided with a first embodiment of the invention;Fig2-1 an internally grooved drying cylinder in longitudinal sectionFig2-2 the siphon pipe of drying cylinderFIG. 3 and 4 are fragmentary views of drying cylinders showing two other embodiments of the invention.Fig2-3 the siphon pipe of drying cylinderFig2-4 the siphon pipe of drying cylinderFIG. 1 shows a cylinder casing 1, which is supported by two opposite end caps Z on a hollow shaft 3. Near to but spaced from the cylinder wall 1, there are a plurality of condensate collectors 4, in the form of closed tubular conduits, which are arrayed in spaced relationship annularly around the inside of and which extend axially over the length of the cylinder casing 1.In FIG. 2, the peripheral grooves in the cylinder wall of all of the embodiments and the small suction pipes projecting into the grooves can be seen. In FIG. 2, there are a plurality of annular peripheral grooves 5 defined in the interior wall in the cylinder casing 1. Small suclion pipes 6 are inserted in some of the peripheral grooves 5.The condensate collector 4 shown in FIG. 2 has a number of suction tubes 6 that are spaced apart such that one suction tube dips into only every second circumferential groove 5. The suction tubes of another condensate collector, not visible in FIG. 2, such as the next adjacent collector 4, are so arranged that they dip into the other circumferential grooves. In this way condensate is removed uniformly from all circumferential grooves.In FIG. 1, the arrows D indicate the vapor flowing into the cylinder and the arrow K indicates the condensate leaving the cylinder.The pipes 6 suck away the condensate and deliver it to the respective condensate collectors 4. From the collectors 4, the condensate passes through the respective radially inwardly directed siphon pipes 7 to the centrally located, axially extending condensate drainage line 8. Each siphon pipe 7 is passed into the respective collector 4 and the pipe 7 is longitudinally movable in a two-part clamping sleeve 12 with a sealing ring 13.According to the embodiment of FIG. 1, the siphon pipes 7 have heat insulation 9 on their outer faces. In this way, there will not be a temperature differential between the inside and the outside of the pipe 7 that will cause condensation.In the embodiment of FIG. 2, the siphon pipe 7 is enclosed by a second pipe 10. Between the two pipes 7 and 10, there is an insulating space 11 which can be filled, for example, with a gas. This insulates the pipe 7 for the above stated reasons.In FIGS. 1, 2 and 4, all suction pipes 6 have the same diameter. Referring to FIG. 3, in addition to or instead of the insulation 9 (or 10, 11), the suction pipes 6a present in the region of the siphon pipe 7 can have a larger diameter than the other suction pipes 6. As more condensate is generated near the siphon pipe 7, more condensate will also be drawn out of the grooves 5 near the siphon pipe 6 so that the same level of condensate is presentin all grooves 5.The same effect can be obtained with the embodiment of FIG. 4. Here the suction pipes have the same diameters. But, the number of suction pipes 6 in the vicinity of the siphon pipe 7 is greater than along the rest of the length of the cylindrical casing 1, whereby a greater quantity of condensate will be drawn out of the grooves 5 in the vicinity of the siphon pipe.Although the present invention has been described in connection with the preferred embodiments thereof, many variations and modifications will now become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims.造纸机的烘缸摘要：本篇阐述的是有关的造纸机的干燥烘缸。烘缸是中空的，烘缸的缸体内表面沿长度方向有沟槽。大多数的集水器沿管道轴向延伸套管。吸水管的设计是从每个集水器到一个总槽对于由此吸入的冷凝水。一个虹吸管被连接到每个集水器收集的冷凝水。虹吸管道是绝缘,以降低内部和外部的温度差异。虹吸管有固定的形状和间隔以至于虹吸管从凹槽中能尽可能从除掉大量凝结水，与凹槽附近的虹吸管道相比,剩下的套管长度要达到更均匀套管，为了达到更均匀的干燥性能，烘缸的缸体在宽度方向有网格。例如,虹吸管的吸入管道附近可能有一个更大的直径或可能会有一个更强的负压式凝聚力在管道附近地区。关键词：烘缸，设计，冷凝水，虹吸管1 造纸机的烘缸1.1烘缸的设计背景本发明涉及造纸机的烘干装置或其它类似的过道,更特别地,是指为了在宽度方向达到均匀烘干。烘缸包括一个套管在他的内表面有沟槽和在里面提供一个虹吸功能的，烘缸是从凹槽内吸取冷凝水的。虹吸管的排列一般包括大量的元素。现在描述，冷凝水的收集在哪个点上的,也就是，在缸体的套管的周边内,提供了小型吸吮管道。这些周边的凹槽的设计，冷凝水的集水器位于套管的里面，套管被连接到许多小的虹吸管用于接收由此产生的凝结水迷途。冷凝水收集器是连接到虹吸管道，相反的，,一般来说, 大幅度径向延长套管。相反，导致弯管轴向延伸主要是凝结水的排水线。尽管造纸机有许多的改进, 特别是在造纸机的干燥部分, 认为在它的宽度,已经有一系列的连续的问题，纸网是不均匀的潮湿(或不均匀的干燥)。尤其在大的烘缸对于生产定量很轻的绉纸, 在整个烘缸的长度上，干燥的均匀度是决定性的纸的数量和质量。干燥状况微小的不同都会对纸网的质量产生很不利的影响。在造纸设备上提高生产的纸质量和造纸设备的结合一直是现代研究首要考虑的。纸的剖面烘干的均匀度已经被努力反复研究。本研究却很困难,因为有许多来源的扰动导致纸面的干燥不良。以下可能性应注意，在纸的某个部位出现的水分能被在纸网的部分被拔出，这可能因此而被归因于造纸机的流浆箱的故障, 例如,从箱体传送到唇板，在过程中出现问题,在湿部到网部出现问题，堵塞压力辊的抽吸孔，在喷淋管道出现问题,等等。更近一步说，在热风罩的操作也可能出现问题的，在一个压力辊的辊型设计故障可能导致干燥的不均匀。所有这些干扰因素都被进行了研究,至少部分地被消除。彻底消除所有未达到干燥规定在现在的时间内是不可以达到的。1.2 烘缸的设计概要本设计的对象是造纸机的烘缸，或者类似物,纸张的剖面的干燥比以前可以早得到的。本设计的进一步的对象从套管地区除掉大量的冷凝水，其中大量的冷凝水都积聚在这里的。根据发明，烘缸的设计是为了适应附近的干燥性能，即虹吸管道，管子从外面径向延伸到套管里面, 对余下的区域干燥性能在沿气缸套管的长度变化。这项设计是基于以下实现，直到现在,人们一直以为是安排整个虹吸的，用所有的零件，从单独的凹槽均匀去除凝结水,，所提供的几何条件是在相同的管槽中放置小的虹吸管。内部空间排列滚筒和虹吸管的安排之间交换的热量也被考虑进去。但是它们已经建立有相关的热量是非常少量的。测量相反的总消费量的加热干燥。更近一步说，它一直是假定这个交换的热量被均匀地分布在烘缸的长度, 自从凝结水收集延长至整个烘缸的长度。然而，设计者意识到虹吸管道, 哪个有相对较大的直径、就在他的表面有一个特别高的程度。这可能是由于这样的事实,即由于内部和外部压力不同时,那里有一个温度升高的凝结蒸汽，他被压积在单独虹吸管道的外部表面。在虹吸管道内增加的冷凝水通过那些外围套管内凹槽, 位于大型虹吸管道的附近。结果，在少数凹槽附近的冷凝水水平也是相对很高的。这就说明了在缺乏干燥性能在这一地区对气缸,这说明了烘缸的这一区域干燥性能很差，所以,在这一点上,纸网仍然是很潮湿的。这是表现为“湿条纹”的纸网。对于提高烘干性能，同时虹吸管道达到的标准水平，有无数的可能性为实现这些措施,。这些可能包括弯管、绝缘管他们连接集水管的凝结水主轴引流线或空心轴上,个别的，交换的热量进入到虹吸管道得内部，以减少大量的冷凝水发生以某种形式的渗出到虹吸管道的外表面。这些冷凝水的数量与传热管壁的系数是成正比的。对于相对少的经费不足, 当虹吸管道是未保温的时候，虹吸管道的传热系数的效率可以从10%减少到1%的水平。随着无关紧要的技术，以至于冷凝水沉积的质量被降低。如果进一步的措施是用来保证在不受控制的时候，没有冷凝蒸汽泄露出来,在剩
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