Externally-pressed flow-returnable multi-layer bag type filtering device

Abstract

The invention discloses an externally-pressed flow-returnable multi-layer bag type filtering device, which comprises a tank body, a filtering bag, a supporting piece, a liquid inlet, a sewage drainage outlet and a filtrate outlet, wherein the filtering bag which is not contacted with an internal wall of the tank body is arranged inside the tank body; a mesh supporting piece which is tightly attached to an inner surface of the filtering bag is arranged inside the filtering bag; the liquid inlet and the sewage drainage outlet are respectively communicated with a gap space between the tank body and the filtering bag; and the filtrate outlet is communicated with the interior of the filtering bag. The externally-pressed flow-returnable multi-layer bag type filtering device is novel in design and reasonable in structure; by adoption of an externally-pressed flow-returnable multi-layer bag type filtering mode, dirt can be conveniently cleaned, and the service life of the filtering bag is effectively prolonged, so that the using cost of the bag type filtering device is greatly reduced; and the externally-pressed flow-returnable multi-layer bag type filtering device has a great market value.

Description

technical field [0001] The invention relates to a filter device, in particular to an external pressure returnable multi-layer bag filter device suitable for filtering liquid. Background technique [0002] The bag filter device has many advantages such as good sealing, strong flow capacity, and easy operation. As a liquid filter device, it is widely used in many industries such as environmental protection, printing, food, biology, petrochemical, electronics, and automobiles. At present, the bag filter devices used in various industries all use the internal pressure filtration method in which the liquid flows from the inside of the bag to the outside of the bag for liquid purification. With this internal pressure filter method from inside to outside, the dirt is intercepted inside the filter bag by the filter bag. After a long time of use, a large amount of dirt will adhere to the inner surface of the filter bag, which will have a negative impact on the filtering effect. There...

AI Technical Summary

Problems solved by technology

With this internal pressure filter method from inside to outside, the dirt is intercepted inside the filter bag by the filter bag. After a long time of use, a large amount of dirt will adhere to the inner surface of the filter bag, which will have a negative impact on the filtering effect. Therefore, it must Clean the dirt on the inner surface of the filter bag

However, because the dirt is attached to the inner surface of the filter bag, it is difficult to clean, so in order to ensure a better filtering effect, the replacement frequency of the filter bag can only be accelerated, which makes the service life of the filter bag not long and increases the cost of the bag filter device.

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