Multimedia filter is a kind of equipment that uses one or several filter media to remove suspended impurities and clarify water effectively by passing turbidity water through granular or non-granular materials with a certain thickness under certain pressure. Now the application can be said to be very extensive. Here is a brief introduction to the matters needing attention in processing and acceptance of multi-media filter.

(1)要求出水槽与滤板的平行允差不大于2 mm。

(1) Parallel tolerance between outlet flume and filter plate is not more than 2 mm.

(2)滤板的水平度及不平度均小于±1．5 mm。滤板的结构，采用整体加工优。当筒体直径较大时，或受原材料、运输等方面制约时，也可采用两瓣拼接成形。

(2) The level and unevenness of the filter plate are less than (+1.5 mm). The structure of filter plate is optimized by integral processing. When the diameter of the cylinder is large, or restricted by raw materials, transportation and other aspects, it can also be formed by two-piece splicing.

(3)对滤板和筒体各接合部位的合理处理，对空气反洗环节尤为重要。

(3) Reasonable treatment of the joint parts of the filter plate and the cylinder is particularly important for air backwashing.

①为因滤板加工和筒体卷制等方面误差造成的滤板和筒体的径向间隙，一般采用圆弧环板逐段焊接。接触部位必需采用满焊。

In order to eliminate the radial clearance between the filter plate and the cylinder caused by the errors in the processing of the filter plate and the rolling of the cylinder, arc annular plate is usually welded step by step. Full welding must be used for contact parts.

②中心管道和滤板的径向间隙处理方法同上。

(2) The treatment method of radial clearance between central pipeline and filter plate is the same as above.

备注：上述措施，确保了过滤和反洗只能通过滤帽或排管间隙连通。同时，也就保证了反洗和过滤通道的分布均匀性。

Note: The above measures ensure that filtration and backwashing can only be connected through the gap between the filter cap and the drain pipe. At the same time, the distribution uniformity of backwashing and filtering channels is ensured.

(4)滤板上加工的通孔，径向误差为±1．5 mm。滤帽导杆和滤板通孔之间配合尺寸的增大，不利于滤帽的安装或固定。通孔的加工必须采用机械设备。

(4) The radial error of the through hole machined on the filter plate is (+1.5 mm). The increase of the matching size between the guide rod of the filter cap and the through hole of the filter plate is not conducive to the installation or fixing of the filter cap. Mechanical equipment must be used in the processing of through holes.

(5)滤帽的材质，尼龙佳，ABS次之。因上部添加的滤料，对滤帽的挤压负荷极大，要求强度要高，以避免变形。滤帽与滤板的接触面(上、下表面)需加弹性橡胶垫。

(5) The material of the filter cap is nylon, followed by ABS. Because of the filter material added on the upper part, the extrusion load of the filter cap is very large, and the strength is required to be high to avoid deformation. Elastic rubber pads should be added to the contact surface (upper and lower surfaces) between the filter cap and the filter plate.

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