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如何选择合适的罗茨真空泵 (Which is a good roots vacuum pump)

发布时间:2022-05-11 08:24:39 人气:20

  使用罗茨真空泵装置的主要优点以及如何选择相关设备?让我们有一个简要的了解。

  (1)降低功耗:一般罗茨真空泵的功耗仅为其他设备功耗的40%~50%。之所以能达到这种节油效果,是因为采用了带有气水分离装置的罗茨真空泵,采用了自吸式离心泵。

  对比示例:容量为52m3/min、真空度为4x104pa(绝压为6x104pa)的容器,泵轴上的功率对比:液环泵为95HP,容量与功率的公差为± 10%。如果使用单级罗茨真空泵,则为55马力,容量和功率公差为±5%。

  (2)操作灵活:真空泵的容量可通过调节装置调节至所需值,并有*小比功率值。罗茨真空泵属于变容量型,可指定25%的储备。如果在制造过程中没有适当考虑(或多或少)所需的输送能力,正确的处理方法是改变皮带轮直径和改变速度,则可以获得理想的运行效果。

  罗茨真空泵是变容泵,所以:①容量与转速成正比,②所需功率与转速和产生的压力成正比。

  在任何情况下,罗茨真空泵都可以将转速降低50%,同时也能保证以上优点。

  (3)提高工作质量:真空度可以通过一定的方法得到,但与泵抽水量无关。在羊皮纸版材的生产中,在真空床上安装了一台液环真空泵,可以观察到各种真空度的变化,**压力为40-45mmhg。真空床上装有分离器和罗茨真空泵,**压力为5mmhg,使用同一台记录仪。

  (4)自我保护:纸机一旦运行,一般不停机。实际工作中采用自保护系统,即用两台规格相同的可互换真空泵组成一个两级真空泵组,仅由一台电机驱动。如果一个停止工作,另一个可以继续工作。但管道要铺设好。此时,线速度和真空度可能会暂时略微降低。

  (5)常用的四种基本方法如下:①带分离器的真空泵;②在网眼部分和毛料部分放置分离装置;③为保证每台纸机的真空度,可建立中央真空机组;④分离装置可以解决高真空度和低真空度的问题。

  (6)真空装置可以安装在任何合适的位置。由于罗茨真空泵只抽空气,因此可随意放置在距真空点100m以内。唯一需要注意的是,空气通过管道时会产生压差(非常小)。*好避开管道中的低压区。分离式气水分离器(柱式下降分离器、分离箱等)均安装在带有真空点的封闭系统中。

  (7) 浸水泵是无害的罗茨真空泵,能够承受意外浸水。它可以把水抽出来。

  (8)无需减少维护工作,因为:①气水分离,防止机器因腐蚀和磨损而损坏;② 由罗茨真空泵的结构决定(因为部件不相互接触)。

  (9) 需要很少或不需要水。罗茨真空泵可以减少用水量。一般容量为52m3/min的液环真空泵需要至少10000l/h的纯无钙冷水才能获得300MMHG的真空度,而罗茨真空泵可以在无水或少量水的情况下运行。

  为了获得更高的真空度,建议使用两级或三级泵组合(即两级或三级泵串联),并用少量水渗透(约400L/h)。

  渗水的目的是:①在琉山压缩空气产生的发热体;②提高真空泵的容积效率;③获得*小功率。

  上海瑞柘环保设备集团有限公司生产销售罗茨真空泵已有10余年,公司自2008成立后,多次与国外某企业洽谈合作。并引进其相应的生产技术,成功实现了自主生产!所有产品划分清晰,产品参数详细齐全,部分大型罗茨真空泵可根据客户需求进行定制生产。

罗茨真空泵机组Roots vacuum pump unit

  Shanghai Ruizhe Environmental Protection Equipment Group Co., Ltd. has produced and sold roots vacuum pump for more than 10 years. Since its establishment in 2008, the company has discussed cooperation with a foreign enterprise for many times. And the introduction of its corresponding production technology, successfully achieved independent production! All products are clearly divided and the product parameters are detailed and complete. Some large roots vacuum pumps can be customized according to customer needs.  

  The main advantages of using roots vacuum pump device and how to select relevant equipment? Let’s have a brief understanding.

  (1) Reduce power consumption: in general, the power consumed by roots vacuum pump is only 40% – 50% of the power consumed by other equipment. This kind of saving effect can be obtained because of the use of Roots vacuum pump with air-water separation device and the use of self-priming centrifugal pump.

  Comparison example: for a vessel with a capacity of 52m3 / min and a vacuum degree of 4x104pa (absolute pressure of 6x104pa), the power comparison on the pump shaft: the liquid ring pump is 95 HP, and the tolerance of capacity and power is ± 10%. If a single-stage roots vacuum pump is used, it is 55 horsepower, with a capacity and power tolerance of ± 5%.

  (2) Flexible operation: the capacity of the vacuum pump can be adjusted to the required value by the regulating device, and there is a minimum specific power value. The roots vacuum pump belongs to the variable capacity type, which can be specified with 25% reserve. If the required conveying capacity is not considered properly (more or less) during manufacturing, the correct treatment method is to change the diameter of the pulley and change the speed, then the ideal operation effect can be obtained.

  Roots vacuum pump is a variable volume pump, so: ① the capacity is proportional to the speed, ② the required power is proportional to the speed and the generated pressure.

  In all cases, roots vacuum pump can reduce the speed by 50%, and also can ensure the above advantages.

  (3) Improvement of work quality: the vacuum degree can be obtained by a certain method, but it has nothing to do with the amount of water pumped by the pump. In the production of parchment paper plate, a liquid ring vacuum pump was installed on the vacuum couch and various vacuum degree changes were noticed, with the absolute pressure of 40-45mmhg. A separator and a Roots vacuum pump are installed on the vacuum couch, and the absolute pressure is 5mmhg with the same recording instrument.

  (4) Self protection: once the paper machine is running, generally do not stop working. In practical work, a self-protection system is adopted, that is, two interchangeable vacuum pumps with identical specifications are used to form a two-stage vacuum pump group, which is driven by only one motor. In case one stops working, the other can work continuously. But the pipes should be laid well. At this time, the linear speed and vacuum may be slightly reduced temporarily.

  (5) Four common basic methods are as follows: ① vacuum pump with separator; ② separation device is placed in the mesh part and wool part; ③ in order to ensure the vacuum degree of each paper machine, a central vacuum unit can be established; ④ separation device can solve the problems of high vacuum degree and low vacuum degree.

  (6) The vacuum unit can be installed at any suitable position. Since the roots vacuum pump only draws air, it can be placed within 100m from the vacuum point at will. The only thing to be noticed is that the pressure difference (which is very small) is generated when the air passes through the pipeline. It is preferable to avoid the low pressure area in the pipe. The separate gas and water separators (column type falling separator, separator box, etc.) are all installed in a closed system with the vacuum point.

  (7) Water immersion pump is harmless roots vacuum pump is able to withstand accidental water immersion. It can pump water out.

  (8) There is no need to reduce the maintenance work, because: ① the separation of air and water prevents the machine from being damaged due to corrosion and wear; ② it is determined by the structure of Roots vacuum pump (because parts do not contact each other).

  (9) Little or no water is needed. Roots vacuum pump can reduce water consumption. The liquid ring vacuum pump with a general capacity of 52m3 / min needs at least 10000l / h pure calcium free cold water in order to obtain a vacuum of 300MMHG, while roots vacuum pump can operate without water or a little water.

  In order to obtain a higher vacuum degree, it is recommended to use two or three-stage pump combination (i.e. two or three pumps in series), and use a small amount of water to penetrate (about 400L / h).

  The purpose of infiltrating water is: ① heat member produced by compressed air in ryushan; ② improving the volumetric efficiency of vacuum pump; ③ obtaining the minimum power.


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