Multilayer composite central water purification filter element

Abstract

The invention relates to the field of water purification filter elements, in particular to a multilayer composite central water purification filter element, which comprises an upper end cover and a lower end cover, a coarse filter layer and a functional filter layer group are arranged between the two end covers, the functional filter layer group comprises a superfine PP cotton layer and an activated carbon layer, and a central flow guide channel is arranged at the central position between the two end covers. A major breakthrough is made through an innovative multi-layer composite structure, 0.3-3 [mu] m grade high-precision filtering is achieved, meanwhile, the large flow of about 26-30 L / min is kept, under the condition that the water quality of a water supply main pipeline reaches the standard, the average service life of the filter element reaches 6 months, the necessary position of the superfine PP cotton layer in the composite filter element is 0.3-2 [mu] m fiber diameter + 0.3-5 [mu] m pore size + 3 [mu] m, and the composite filter element can be used for filtering water. The particulate matter interception rate is greater than or equal to 91% + / -1%, and 30 groups of repeated experiments verify that the average interception rate of 3-micron particles is 91%.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification filter elements, in particular to a multi-layer composite central water purification filter element. Background Art

[0002] The central water purification filter cartridges currently on the global market generally have the following defects: False labeling of filtration accuracy: Many domestic and foreign brands of PP cotton filter elements claiming a filtration accuracy of 1μm were found through third-party testing to have an actual interception rate of almost zero for 5μm particles, a 10mm interception rate of 57%, and a 15μm interception rate of only 94%. Existing filter elements are difficult to meet the actual needs of central water purification systems.

[0003] Structural defects: There is a risk of leakage when the traditional flat-mouth filter element is combined with the filter bottle, and the filter element is easy to shift, resulting in seal failure. A large number of microorganisms grow and gather at the flat-mouth position, and there is a risk of secondary contamination caused by microbial growth.

[0004] Short lifespan: Ordinary PP cotton filter elements are easily clogged, and their actual service life is only a few days to a month, requiring frequent replacement.

[0005] The flow rate is severely attenuated: after filtration by the ultrafiltration filter element, the flow rate is attenuated to 23L / min, and the soft water filter element is further reduced to 16L / min. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-layer composite central water purification filter element to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a multi-layer composite central water purification filter element, comprising two upper and lower end covers, a coarse filter layer and a functional filter layer group are arranged between the two end covers, the functional filter layer group includes an ultra-fine PP cotton layer and an activated carbon layer, and a central guide channel is arranged at the center position between the two end covers.

[0008] In a preferred embodiment, grooves are provided at the plug-in structures of the two end covers, and O-rings are provided at the grooves, and hot melt adhesive layers are provided on the inner side walls of the two end covers.

[0009] In a preferred embodiment, the interference fit between the plug-in structure of the end cap and the filter bottle cover is 0.05-0.15 mm, and the compression rate of the O-ring is 18-23%.

[0010] In a preferred embodiment, the two coarse filter layers are multi-layer composite folded PP cotton, comprising 3-7 layers of filter units with gradually decreasing pore sizes.

[0011] In a preferred embodiment, the thickness of the coarse filter layer is 13-17 mm, the thickness of the ultrafine PP cotton layer is 10-16 mm, the thickness of the activated carbon layer is 10-16 mm, and the void gradient range is ΔD / ΔL=0.02-0.05 μm / mm.

[0012] In a preferred embodiment, the activated carbon in the activated carbon layer is activated by KOH and acid-washed, and the iodine value is ≥1050 mg / g.

[0013] In a preferred embodiment, the polypropylene fiber of the ultra-fine PP cotton layer has a diameter of 0.3-2 μm, a pore size of 0.3 μm-5 μm, and a weaving angle of 30°-80°.

[0014] In a preferred embodiment, the coarse filter layer is arranged close to the central guide channel, and the functional filter layer group is arranged on the outside of the coarse filter layer, and the radial positions of the ultrafine PP cotton layer and the activated carbon layer in the functional filter layer group are interchangeable.

[0015] In a preferred embodiment, the functional filter layer group is arranged close to the central guide channel, and the coarse filter layer is arranged on the outside of the functional filter layer group. The radial positions of the ultrafine PP cotton layer and the activated carbon layer in the functional filter layer group are interchangeable.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The coarse filter layer of the present invention preferably uses the advantage of gradient folded PP cotton, which can greatly increase the filtration area, which is dozens to hundreds of times larger than that of traditional filter elements. The multi-layer composite folded PP cotton with gradually reduced pore size has better performance and can more fully intercept large, medium and small particles in different levels in the coarse filter layer. The asymmetric turbulence design is achieved by the wavy pleats of the folded PP cotton. The pleat amplitude is 2-5mm and the wavelength is 10-20mm, which causes the water flow to generate radial vortices, thereby improving the interception efficiency of large particles by more than 30%, and significantly reducing the clogging problem. The ultra-fine PP cotton layer of the present invention plays an essential role in the composite filter element. The fiber diameter is 0.3-2μm + the pore size is 0.3-5μm + 3μm. The particle interception rate is ≥91%±1%. After 30 sets of repeated experiments, the average interception rate of 3μm particles is 91%, and the standard deviation σ is 0.33% (meeting the ±1% error requirement). All interception rate data pass the 95% confidence interval test. The sample size n=30 meets the requirements of the central limit theorem. The present invention has achieved a major breakthrough through its innovative multi-layer composite structure, achieving high-precision filtration of 0.3μm-3μm while maintaining a large flow rate of about 26-30L / min. When the water quality of the water supply main pipeline meets the standards, the average service life of the filter element is up to 6 months. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention; Figure 2 is a schematic diagram of a partial cross-sectional structure of Example 1 of the present invention; Figure 3 This is a schematic diagram of the main structure of Example 1 of the present invention; Figure 4 is a schematic diagram of a vertical cross-sectional structure of Example 1 of the present invention; Figure 5 is a schematic diagram of the transverse cross-sectional structure of Example 1 of the present invention; Figure 6 is a schematic diagram of a vertical cross-sectional structure of Example 2 of the present invention; Figure 7 It is a schematic diagram of the transverse cross-sectional structure of Example 2 of the present invention.

[0018] In the figure: 101, coarse filter layer; 102, functional filter layer group; 102a, ultra-fine PP cotton layer; 102b, activated carbon layer; 103, central guide channel; 104, end cover; 201, groove; 202, O-ring; 203, hot melt adhesive layer. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0020] See also Figure 1-Figure 5 The present invention provides a multi-layer composite central water purification filter element, including two upper and lower end covers 104, a coarse filter layer 101 and a functional filter layer group 102 are arranged between the two end covers 104, the functional filter layer group 102 includes an ultra-fine PP cotton layer 102a and an activated carbon layer 102b, and a central guide channel 103 is arranged at the center position between the two end covers 104.

[0021] In a preferred embodiment, a groove 201 is provided at the plug-in structure of the two end covers 104, and an O-ring 202 is provided at the groove 201. A hot melt adhesive layer 203 is provided on the inner wall of the two end covers 104. When used specifically, the end cover 104 has a thickness of 2-4 mm, an edge side of 8-12 mm, a height of 4-40 mm, an outer diameter of 22-28 mm, 1-3 grooved pipe openings, a dynamic compensation gap of 0.2-0.5 mm (preferably 0.3 mm) is provided between the layers, and 3-5 spiral guide ribs (height 0.1-0.2 mm) are provided in the gap, with an inclination angle of 15°±2°.

[0022] In a preferred embodiment, the interference fit between the plug-in structure of the end cap 104 and the filter bottle cover is 0.05-0.15 mm, the compression rate of the O-ring 202 is 18-23%, the outer contour of the plug-in pipe port is circular, elliptical, or polygonal, and the inner channel maintains a circular cross-sectional area ≥380 mm².

[0023] In a preferred embodiment, the two coarse filter layers 101 are multi-layer composite folded PP cotton, comprising 3-7 layers of filter units with gradually decreasing pore sizes.

[0024] In a preferred embodiment, the thickness of the coarse filter layer 101 is 13-17 mm, preferably 15 mm, the thickness of the ultrafine PP cotton layer 102a is 10-16 mm, preferably 10 mm, the thickness of the activated carbon layer 102b is 10-16 mm, preferably 16 mm, and the void gradient range is ΔD / ΔL=0.02-0.05 μm / mm.

[0025] In a preferred embodiment, the activated carbon in the activated carbon layer 102b is activated by KOH and acid-washed, and the iodine value is ≥1050 mg / g. The high-performance activated carbon that has undergone KOH activation + acid-washing treatment can quickly adsorb trace organic matter (such as pesticide residues, antibiotics), heavy metal ions, residual chlorine, etc. in water. The high adsorption performance can reduce the unit treatment cost.

[0026] In a preferred embodiment, the polypropylene fiber diameter of the ultrafine PP cotton layer 102a is 0.3-2 μm, the pore size is 0.3 μm-5 μm, the weaving angle is 30°-80°, the interception rate of 2 μm particles is ≥60%±0.5%, and the interception rate of 3 μm particles is ≥91%±1%.

[0027] In a preferred embodiment, the functional filter layer group 102 is arranged close to the central guide channel 103, and the coarse filter layer 101 is arranged on the outside of the functional filter layer group 102, and the radial positions of the ultrafine PP cotton layer 102a and the activated carbon layer 102b in the functional filter layer group 102 are interchangeable.

[0028] Working principle of the present invention: When in use, when the water source to be treated is processed from the outside through the filter element, the water is first treated using the coarse filter layer 101 at the outer end, and then the water is processed through the ultra-fine PP cotton layer 102a and the activated carbon layer 102b. During specific use, the ultra-fine PP cotton layer 102a or the activated carbon layer 102b can be set close to the coarse filter layer 101, and the radial positions of the ultra-fine PP cotton layer 102a or the activated carbon layer 102b are interchangeable. The average interception rate of 3μm particles in water after treatment by the functional filter layer group 102 is 91%, and the standard deviation σ=0.33% (meets the ±1% error requirement). All interception rate data pass the 95% confidence interval test, and the sample size n=30 meets the requirements of the central limit theorem. The purified water enters the central diversion channel 103 and is then discharged through the drainage hole on the end cover 104. Example

[0029] See also Figure 6-Figure 7 , different from Example 1, the coarse filter layer 101 is arranged close to the central guide channel 103, and the functional filter layer group 102 is arranged on the outside of the coarse filter layer 101, and the radial positions of the ultra-fine PP cotton layer 102a and the activated carbon layer 102b in the functional filter layer group 102 are interchangeable.

[0030] During use, the water source to be treated is discharged into the central guide channel 103 from the water inlet at the end cover 104. The water in the central guide channel 103 is first treated by the coarse filter layer 101 and then treated by the functional filter layer group 102. The water can be treated first by the ultra-fine PP cotton layer 102a and then by the activated carbon layer 102b. Alternatively, the water can be treated first by the activated carbon layer 102b and then by the ultra-fine PP cotton layer 102a. The treated water can be discharged.

[0031] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. Multi-layer composite central water purification filter element, characterized by: The invention comprises two upper and lower end caps (104), a coarse filter layer (101) and a functional filter layer group (102) are provided between the two end caps (104), the functional filter layer group (102) comprises an ultra-fine PP cotton layer (102a) and an activated carbon layer (102b), and a central guide channel (103) is provided at the center position between the two end caps (104).

2. The multi-layer composite central water purification filter element according to claim 1, characterized in that: The plug-in structures of the two end covers (104) are both provided with grooves (201), and the grooves (201) are provided with O-type sealing rings (202). The inner side walls of the two end covers (104) are both provided with hot melt adhesive layers (203).

3. The multi-layer composite central water purification filter element according to claim 2, characterized in that: The interference fit between the plug-in structure of the end cap (104) and the filter bottle cap is 0.05-0.15 mm, and the compression rate of the O-ring (202) is 18-23%.

4. The multi-layer composite central water purification filter element according to claim 1, characterized in that: The two coarse filter layers (101) are multi-layer composite folded PP cotton, comprising 3-7 layers of filter units with gradually decreasing pore sizes.

5. The multi-layer composite central water purification filter element according to claim 4, characterized in that: The thickness of the coarse filter layer (101) is 13-17 mm, the thickness of the ultrafine PP cotton layer (102a) is 10-16 mm, the thickness of the activated carbon layer (102b) is 10-16 mm, and the gap gradient range is ΔD / ΔL=0.02-0.05 μm / mm.

6. The multi-layer composite central water purification filter element according to claim 5, characterized in that: The activated carbon in the activated carbon layer (102b) is activated by KOH and acid-washed, and has an iodine value of ≥1050 mg / g.

7. The multi-layer composite central water purification filter element according to claim 5, characterized in that: The polypropylene fiber diameter of the ultra-fine PP cotton layer (102a) is 0.3-2 μm, the pore size is 0.3 μm-5 μm, and the weaving angle is 30°-80°.

8. The multi-layer composite central water purification filter element according to claim 1, characterized in that: The coarse filter layer (101) is arranged close to the central guide channel (103), and the functional filter layer group (102) is arranged outside the coarse filter layer (101), and the radial positions of the ultrafine PP cotton layer (102a) and the activated carbon layer (102b) in the functional filter layer group (102) are interchangeable.

9. The multi-layer composite central water purification filter element according to claim 1, characterized in that: The functional filter layer group (102) is arranged close to the central guide channel (103), and the coarse filter layer (101) is arranged outside the functional filter layer group (102). The radial positions of the ultra-fine PP cotton layer (102a) and the activated carbon layer (102b) in the functional filter layer group (102) are interchangeable.

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