Another feature of wire-wound filters is their ability to pass through large amounts of flow.
Each wire-wound filter element with filtering accuracy has a fixed number of channels D. After the filtration accuracy is determined, the number of channels L is not the same as the corresponding increase or decrease according to the length of the filter element.
The formula for the total number of channels is: the total number of channels = D × L × 2.
Take a filter element with a length of 250 mm as an example, its filtration accuracy is 20 im, the number of channels in diameter is 15, and the number of channels along the length of the filter element is 51, so the total number of channels in the filter element is 15 × 51 × 2 = 1530, that is, there are 1530 independent channels on the filter element.
If a
Filter velocity of 0.5 m3 / h (water, for example), the 8.3 L/min, the liquid was dispersed into the 1530 independent channel 迚 line filter, within each channel
The flow has actually dropped to 5.4 mL/min.
If the filtration accuracy is 3 im, the number of channels is 27, and the number of channels is 91, then the filter
The total number of channels on the core is 27 × 91 × 2 = 4 914(number).
Therefore, for 3 im precision filter elements, although the filter medium (i.e., fiber villi)
It became more dense, but the number of filter channels increased to 4914, and the flow within the channel was only 1.7 mL/min, which can be called "siphon flow".
It can be seen that the wire-wound filter element can pass through the filter element with a large flow rate, but in a structure of dispersed flow rate, the filter element can still maintain its excellent filtration performance under a small pressure difference. This structure of the filter element is also conducive to filtering out colloidal or gelatinous substances in the liquid.
The wire-wound filter element is often called a precision filter element because it can filter out particles much smaller than the pore size through a larger hole.
To sum up, wire wound filter 丌 is arbitrary winding of a yarn, the raw materials, chemical fiber, cotton fiber quality, processed into roving frame not have strict quality requirements, the use of special winding machine precision processing and become, each filter must be through the filter length, diameter, surface testing, every batch of sampling 迚 permeability test, according to JB/T 7218-2004
The standard of "cartridge pressure liquid filter element" requires regular sampling test.
