Composite filter element

Abstract

The utility model discloses a composite filter element which comprises a shell and an end cover, the shell is internally provided with a filter element, and the end cover is provided with only three water inlets and outlets, namely a water inlet, a pure water outlet and a waste water outlet; the front filter element, the RO filter element and the rear filter element are arranged in the shell and are sequentially connected through a water path formed in the shell; and a one-way valve is arranged on each of the three water inlets and outlets. According to the utility model, three or more filter elements are integrated in one shell to form the composite filter element, so that various impurities can be filtered by only one filter element; and one-way valves are arranged at the water inlets and the water outlets, so that reverse pressure relief is avoided, and the problem of series flow can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of water filtration, in particular to a composite filter element. Background Art

[0002] In the equipment that filters water to obtain purified water, the use of filter elements is indispensable. At present, the main filter element is the RO filter element. In the water purifier, there are generally pre-filter elements and post-filter elements used in conjunction with the RO filter element. In order to reduce the volume of the water purifier, composite filter elements are widely used in the industry, that is, two or three of the pre-filter element, RO filter element, and post-filter element are integrated together in a radial sleeve or axial stacking manner. For example, the applicant has applied for a patent for "A RO membrane composite filter element", with publication number CN214457187U. The solution includes a filter bottle, a pressure plate, a turntable and a filter bottle cover, wherein the filter bottle cover is fixedly connected to the filter bottle, the turntable is placed in the filter bottle cover, the pressure plate is fixedly connected to the filter bottle cover, the turntable is confined in the filter bottle cover, and the turntable can rotate relative to the pressure plate; a pre-filter element assembly and an RO membrane assembly are arranged in the filter bottle, the pre-filter element assembly is an annular structure, the RO membrane assembly is arranged in the pre-filter element assembly, the RO membrane assembly includes an RO membrane and a top cover, the top cover is sleeved on the RO membrane, and the upper end surface of the RO membrane is closed; a central tube is arranged in the RO membrane, and a water inlet hole is arranged on the circumference of the central tube; and a first sleeve is also included, the first sleeve is located between the pre-filter element assembly and the RO membrane assembly, the first sleeve separates two independent water flow channels between the inner side of the pre-filter element assembly and the outer side of the RO membrane assembly; a pre-filter element assembly and an outer wall of the first sleeve are provided between the inner side of the pre-filter element assembly and the outer side of the RO membrane assembly is the first water outlet channel; between the outer side of the RO membrane and the inner wall of the first casing is the second water inlet channel, and the second water inlet channel is connected with the lower end surface of the RO membrane; the pressure plate is provided with 5 water inlets, namely, the first water inlet, the first water outlet, the second water inlet, the waste water outlet and the pure water outlet, the pure water outlet is located at the center of the pressure plate, and the other water inlets are located around the pure water outlet, the first water outlet and the second water inlet are respectively connected with the first water outlet channel and the second water inlet channel; the turntable is provided with five water columns, the fifth water column is located at the center, and the first, second, third and fourth water columns are located around the fifth water column; the fifth water column in the middle of the turntable is opposite to the pure water outlet in the middle of the pressure plate, and a self-sealing water component is arranged in the fifth water column; when the turntable rotates relative to the pressure plate, there are two states in which the first water inlet, the first water outlet, the second water inlet and the waste water outlet on the pressure plate are connected with the first, second, third and fourth water columns on the turntable or are staggered with each other. This technical solution integrates two filter elements together. The two filter elements each have its own independent water inlet and outlet, so 5 water inlets need to be set on the pressure plate; if the three filter elements are integrated together, the water inlets on the pressure plate will reach 7, which makes the design and processing of the pressure plate quite difficult. Summary of the invention

[0003] The object of the present utility model is to provide a composite filter element in which each filter element is directly connected.

[0004] The technical solution adopted by the present utility model is as follows: A composite filter element includes a housing and an end cap. A filter element is disposed inside the housing. It is characterized in that: there are only three water inlets and outlets on the end cap, namely a water inlet, a pure water outlet and a wastewater outlet; a pre-filter element, an RO filter element and a post-filter element are disposed inside the housing and are sequentially connected through a water path formed inside the housing; a one-way valve is provided on each of the three water inlets and outlets.

[0005] The pre-filter element is an activated carbon / PP cotton filter element; the post-filter element is an activated carbon filter element.

[0006] It further includes a scale inhibitor filter element disposed between the pre-filter element and the RO filter element.

[0007] It further includes a pressure plate and a rotating disk. The end cap is fixedly connected to a filter bottle. The rotating disk is disposed inside the end cap. The pressure plate is fixedly connected to the end cap to limit the rotating disk inside the end cap. The rotating disk can rotate relative to the pressure plate; three water passing columns are provided on the rotating disk, and the one-way valves are disposed in each water passing column; three water passing ports are provided on the pressure plate, and the water passing ports and the water passing columns together form the water inlets and outlets; there is a convex point on the surface of the rotating disk or the pressure plate.

[0008] The present utility model integrates three or more filter elements in a housing to form a composite filter element. Therefore, only this one filter element can complete the filtration of various impurities; with such a combination, the greatest potential risk is the cross-flow and reverse flow between the filter elements. Therefore, the present utility model provides one-way valves at each water inlet and outlet to ensure no reverse pressure relief, that is, the cross-flow problem can be avoided; the convex point is designed on the surface of the rotating disk or the pressure plate, so that the surface contact between the two is changed to point contact, thus having less friction and smoother rotation. Description of the Drawings

[0009] Figure 1 is a schematic cross-sectional view of the present utility model.

[0010] Figure 2 is a schematic view in the direction of the end cap. Detailed Embodiment

[0011] Referring to the drawings. This embodiment includes a housing 10, and three water inlets and outlets 12 are provided on its end cap, namely a water inlet, a pure water outlet and a wastewater outlet; a one-way valve 11 is provided in each water inlet and outlet to make the water flow only in the set direction and not reversely. Five-stage filtration filter materials are provided inside the housing. According to the water flow sequence, they are PP cotton 1, activated carbon 2, scale inhibitor 3, RO membrane 4 and activated carbon 5. Among them, PP cotton 1 and activated carbon 2 form the pre-filter element, and activated carbon 5 is the post-filter element. The surface of the pressure plate of the end cap has several convex points to make the relative rotation between it and the rotating disk smoother.

Claims

1. A composite filter element, comprising a housing and end caps, with a filter element disposed inside the housing, characterized in that: There are only three water inlets and outlets on the end cover, namely the water inlet, the pure water outlet and the waste water outlet; the shell has built-in pre-filter, RO filter and post-filter, which are connected in sequence through the water channel formed inside the shell; a one-way valve is provided on each of the three water inlets and outlets.

2. The composite filter element according to claim 1, wherein: The front filter element is an activated carbon / PP cotton filter element; the rear filter element is an activated carbon filter element.

3. The composite filter element according to claim 2, wherein: The utility model also comprises an antiscalant filter element, which is arranged between the pre-filter element and the RO filter element.

4. A composite filter element according to any one of claims 1 to 3, characterized in that: It also includes a pressure plate and a turntable, the end cover is fixedly connected to the filter bottle, the turntable is placed in the end cover, the pressure plate is fixedly connected to the end cover, the turntable is confined in the end cover, and the turntable can rotate relative to the pressure plate; three water columns are arranged on the turntable, and the one-way valve is arranged in each water column; three water ports are arranged on the pressure plate, and the water ports and the water columns together constitute the water inlet and outlet; there is a convex point on the surface of the turntable or the pressure plate.

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