油滤器 Oil Filter

文章来源：未知 添加时间：2016-11-21 15:01

油过滤器属于管道粗过滤器系列，也可用于气体或其他介质大颗粒物过滤，安装在管道上能除去流体中的较大固体杂质，使机器设备（包括压缩机、泵等）、仪表能正常工作和运转，达到稳定工艺过程，保障安全生产的作用。篮式过滤器主要过滤材料有不锈钢多孔板、不锈钢编织网和不锈钢烧结网等。就油过滤器能根据客户具体要求（特殊压力、特殊口径）定制。篮式过滤器具有纳污量大、耐压高、安装清理方便等优点。

油过滤器介绍

油器按其过滤精度(滤去杂质的颗粒大小)的不同，有粗过滤器、普通过滤器、精密过滤器和特精过滤器四种，它们分别能滤去大于100μm、10～100μm、5～10μm和1～5μm

大小的杂质。

油过滤器注意事项

选用滤油器时，要考虑下列几点：

(1)过滤精度应满足预定要求。

(2)能在较长时间内保持足够的通流能力。

(3)滤心具有足够的强度，不因液压的作用而损坏。

(4)滤心抗腐蚀性能好，能在规定的温度下持久地工作。

(5)滤心清洗或更换简便。                                                 

因此，滤油器应根据液压系统的技术要求，按过滤精度、通流能力、工作压力、油液粘度、工作温度等条件选定其型号。

2.安装滤油器在液压系统中的安装位置通常有以下几种：

(1)要装在泵的吸油口处：

泵的吸油路上一般都安装有表面型滤油器，目的是滤去较大的杂质微粒以保护液压泵，此外滤油器的过滤能力应为泵流量的两倍以上，压力损失小于0.02MPa。

(2)安装在泵的出口油路上：

此处安装滤油器的目的是用来滤除可能侵入阀类等元件的污染物。其过滤精度应为10～15μm，且能承受油路上的工作压力和冲击压力，压力降应小于0.35MPa。同时应安装安全阀以防滤油器堵塞。

(3)安装在系统的回油路上：这种安装起间接过滤作用。一般与过滤器并连安装一背压阀，当过滤器堵塞达到一定压力值时，背压阀打开。

(4)安装在系统分支油路上。

(5)单独过滤系统：大型液压系统可专设一液压泵和滤油器组成独立过滤回路。

液压系统中除了整个系统所需的滤油器外，还常常在一些重要元件(如伺服阀、精密节流阀等)的前面单独安装一个专用的精滤油器来确保它们的正常工作。

 The oil filter belongs to pipeline primary filter series and it is used to filter coarse particulate matters in the gas or other mediums. It is mounted in the pipe and used to remove coarse solid impurities in the fluids. It enables the machinery equipments(compressor, pump, etc) and instruments to work properly, and reaches the purpose to stabilize craft process and  safeguard safe production. The basket filter is mainly used to filter materials such as stainless steel multi-orifice, stainless steel mesh grid and stainless steel sintering mesh, etc. It can be customized as per the requirements of clients(special pressure and caliber).The basket filter has many advantages such as large capacity to receive pollutants, the ability to bear high pressure and to be installed and cleaned conveniently, etc.

The introduction of the oil filter

According to the filter precision ,(the size of  the particles from which the impurities have been filtered out )it can be categorized into four kinds: coarse filter, common filter, precision filter and ultra-precision filter. They can respectively filter out the impurities with the diameters of above 100μm,10～100μm、5～10μm and 1～5μm.

Matters needing attention

Some points should be considered when selecting the oil filter

(1)          Filter precision should meet the predetermined requirements.

(2)           It can keep enough flow-capacity for a long time.

(3)          The filter element has sufficient strength and will not be damaged due to hydraulic effect.

(4)          The filter element has good corrosion resistance and can  work enduringly at specified temperature.

(5)          It is simple and convenient to rinse and replace the filter element.

Therefore, the model for the oil filter should be chosen according to the technical requirements of its hydraulic system and conditions such as filter precision, flow capacity, working pressure, oil viscosity and working temperature, etc.

2.The installation sites for the oil filter in the hydraulic system are usually as follows:

(1) to mount on the inlet port of the pump

The surface type oil filter is usually fixed on the oil entry of the pump, the purpose of which is to filter out bigger impure  particles to safeguard hydraulic pump, moreover, the filter capacity for the oil filter should be two times larger than pumping capacity, and pressure loss is below 0.02MPa.

(2) to mount on the oil exit of the pump:

   The purpose for mounting the oil filter here is to eliminate the pollutants which will probably intrude into the element such as valves, etc. Its filter precision should be 10~15μm and it can bear working pressure and surge pressure in the oil way. The pressure drop should be below 0.35MPa.  Meanwhile, the safety valve should be fixed lest the oil filter be blocked.

(3)to mount on the return oil loop of the system

The kind of installation can acts as the function of indirect filtration. The filter is usually installed in parallel with a counterbalance valve, which  will open when the filter blocks to a certain pressure values.

(4) to mount on the branch oil loop of the system

(5) independent filter system

The large hydraulic system can provide a independent filter loop made of a hydraulic pump and an oil filter.

In the hydraulic system, apart from the oil filter needed in the entire system, a fine oil filter with specialized purpose is often  independently mounted on the front of important components(such as servo valve, precision throttle valve, etc)so that they can work properly.