CN202724803U - Filter element of automatic cleaning membrane filter - Google Patents

Abstract

The utility model relates to a filter core of a self-cleaning membrane filter, which comprises: a plurality of filter core monomers and liquid outlet pipes; The hollow tubes are composed of conjoined pieces, which are evenly distributed on the outer cylindrical surface of the riser in a petal-like structure. The upper bottom of the inner support is sealed and connected with the outer edge of the riser tube, the lower bottom of the inner support is closed, and the hollow tubes of the inner support pass through the bottom of the tube. The space is connected with the bottom of the riser pipe, and there are several circumferential slits at a certain distance along the axial direction on the inner support petal-type outer cylinder; On the top, the upper and lower ends of the film are sealed and connected to the inner support, and the liquid riser pipes of each inner support are sealed and connected to the liquid outlet pipe. The advantages of the utility model are as follows: the filter elements can be used in groups, can filter liquids with low suspended solids, and can also filter liquids with high suspended solids, and can collect and dry the suspended solids, forming a filter with a large filling area and a reverse filter. Rinse well.

Description

A self-cleaning membrane filter element

technical field

The utility model relates to a separation technology, in particular to a self-cleaning membrane filter element.

Background technique

Filtration is an important method in liquid-solid separation. For large-flow and large-volume liquid filtration, filters that can be automatically backwashed are often used. At present, the filters for automatic backwashing mainly include media filters, screen filters, fiber filters, film filters, etc., and each filter has its applicability. Membrane filters, as the main type of washable filters, are widely used in the field of solid-liquid separation. Membrane filters have a wide range of filtration precision and various types of membranes. Common membrane filters on the market include disc filters, drum filters, etc. These filters are generally washed and regenerated with high-pressure water, but in order to meet the cleaning requirements, the overall filter does not operate under pressure. The film filling area in the system is small, the system occupies a large area, and the water consumption for backwashing is large. Filter cake collection is also difficult. The American Aquatech company has developed a membrane filter disc filter, which uses vacuum suction to backwash, which greatly increases the membrane filling area, but the vacuum suction pressure does not exceed 1 atmosphere, and it is difficult to achieve effective filtration for some sticky impurities. backwash. In addition, the filter is only suitable for water filtration and cannot collect filter cakes. Some people in China also tried to cover the membrane on the porous lining to form a candle filter, but it was found that the backwashing effect was very poor and the filter cake could not be collected well. Based on the current situation, the inventor believes that developing a self-cleaning membrane filter with a large filling area, high-efficiency backwashing and effective collection of filter cakes will have a great market prospect.

Utility model content

The purpose of the utility model is to provide a self-cleaning membrane filter element for the deficiencies of the prior art. The filter element can filter the liquid containing suspended matter, reduce the suspended matter in the filtrate, and can also collect the suspended matter filter cake.

The utility model is realized through the following technical solutions: a self-cleaning membrane filter element, which is characterized in that it includes several filter element monomers and liquid outlet pipes; The inner support is composed of a number of cylindrical hollow tubes, and the petal structure is evenly distributed on the outer cylindrical surface of the liquid riser. The upper bottom of the inner support is sealed and connected with the outer edge of the liquid riser, and the lower bottom of the inner support is closed. Each hollow tube of the inner support communicates with the bottom of the riser pipe through the space at the bottom of the tube, and there are several circumferential slits at certain intervals on the outer cylinder of the inner support petals along the axis direction; the film is made into a filter cylinder shape 1. Covering the petal-shaped outer cylindrical surface of the inner support, the upper and lower ends of the film are sealed and connected with the inner support, and the liquid riser pipes of each inner support are sealed and connected with the liquid outlet pipe.

Vertical grooves are arranged on the inner support petal-shaped outer cylinder surface.

The positive effects of the utility model are: a self-cleaning membrane filter element proposed by the utility model has the following advantages: the membrane is closely attached to the surface of the petal-type inner support cylinder under the action of the filter pressure difference, and many The grooves and circumferential gaps collect the liquid filtered by the membrane; during backwashing, the membrane rapidly expands into a circular shape under the action of backwash water or air, and the impurities attached to the membrane are removed under the action of backwash pressure and membrane expansion force. Clean up. The filter elements can be used in groups and installed on the filter, which can filter liquids with low suspended solids and liquids with high suspended solids, and can collect and dry the suspended solids, forming a large filling area and backwashing effect. Good, and the self-cleaning membrane filter that can effectively recover the filter cake has great market prospects.

Description of drawings

Fig. 1 is a schematic cross-sectional view of an embodiment of the utility model installed in a filter.

Figure 2 is an enlarged view of part A of Figure 1.

Fig. 3 is a schematic cross-sectional view of the filter element in a filtering state.

Fig. 4 is a schematic cross-sectional view of the filter element in a backwashing state.

Below in conjunction with embodiment the utility model is further described:

Figures 1 to 2 are schematic cross-sectional views of an embodiment of the utility model installed in a filter. In the figure, a self-cleaning membrane filter element, it includes: several filter element monomers 1, liquid outlet pipe 3; Said filter element monomer is made up of film 11, inner support 12, riser pipe 13, and inner support 12 is made up of A number of columnar hollow tubes are connected together and are evenly distributed on the outer cylindrical surface of the riser pipe 13 in a petal-like structure. Sealed connection, the lower bottom of the inner support 12 is closed, the hollow tubes of the inner support 12 communicate with the bottom of the riser pipe 13 through the space at the bottom of the tube, and the petal-shaped outer cylinder of the inner support 12 is provided with a number of holes at a certain distance along the axis direction. Circumferential slit 14; the film 11 is made into a filter cylinder and covered on the outer cylindrical surface of the inner support 12 petals. The tube is tightly connected to the outlet pipe 3.

The utility model further adopts the following measures: vertical grooves 15 are arranged on the outer cylindrical surface of the inner supporting petals.

The utility model works like this:

The filtration process is shown in Figure 3. The liquid passes through the membrane from the outside of the filter element, collects into the groove on the inner support, and passes through the slits, the inner tube of the petal hollow tube, the riser tube, and finally flows out from the upper end of the riser tube. Under the action of the filter pressure difference, the membrane clings to the inner support of the petals and is also petal-shaped, and the particles in the liquid are intercepted on the surface of the membrane. Different types of membranes can be selected to meet the needs of filtration accuracy, filtration temperature, and filtration media.

The backwash process is shown in Figure 4: when the pressure difference or time reaches the set value, the backwash liquid flows downward at high speed from the upper part of the riser tube under the action of hydraulic pressure or air pressure, and passes through the inner tube of the petal hollow tube, and the slit is fast and uniform Backwash membrane. Under the action of backwashing water or air, the membrane rapidly expands from a petal shape to a circular shape. Impurities are cleaned under the action of backwashing pressure and membrane expansion force. Each group of filtrate tubes can be backwashed in turn, and can be added during backwashing. Filter aid, use filter aid to form a filter cake on the membrane for filtration to improve filtration accuracy.

The above describes the implementation of the utility model in conjunction with the accompanying drawings and the examples. The structure given in the examples does not constitute a limitation to the utility model. Those skilled in the art can make adjustments according to the actual needs. Various changes or modifications within the scope of the claims are within the scope of protection.

Claims (2)

1. A self-cleaning membrane filter element is characterized in that it includes several filter element monomers and outlet pipes; The hollow tubes are connected in a petal-like structure and are evenly distributed on the outer cylindrical surface of the riser tube. The upper bottom of the inner support is sealed and connected with the outer edge of the riser tube. The lower bottom of the inner support is closed, and the hollow tubes of the inner support pass through the tube. The bottom space is connected with the bottom of the riser pipe, and there are several circumferential gaps at certain intervals on the surface of the inner-supported petal-type outer cylinder along its axis; On the surface, the upper and lower ends of the film are sealed and connected to the inner support, and the liquid riser pipes of each inner support are sealed and connected to the liquid outlet pipe. 2. The self-cleaning membrane filter element according to claim 1, wherein vertical grooves are arranged on the inner support petal-type outer cylinder.

Images