Composite filter element

Abstract

The utility model discloses a composite filter element which comprises a shell, an opening is formed at one end of the shell, a waterway joint is arranged at the opening, and a raw water channel, a pure water channel and a waste water channel are arranged in the waterway joint; the fine filtering unit and the central pipe are arranged in the shell, and the central pipe is sleeved with the fine filtering unit; the inner pipe is arranged in the central pipe, a rear filter unit is arranged in the inner pipe, the rear filter unit comprises granular active carbon, a gap is formed between the central pipe and the inner pipe, and the gap is communicated with the inner pipe. The problem that the carbon rods are prone to breakage in the transportation process is solved, and the manufacturing cost of adopting the carbon rods as the rear filtering units is reduced.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to a composite filter element. Background Technology

[0002] Current water purification devices all require multiple filtration units with different filtration functions to filter raw water, ultimately producing purified water for users. Therefore, an increasing number of water purification devices on the market integrate multiple filtration units into a single filter bottle to form a composite filter cartridge. For example, a radial arrangement of a pre-filtration unit, a fine filtration unit, and a post-filtration unit is used, with the post-filtration unit employing a carbon rod. However, due to the high manufacturing cost of carbon rods and their susceptibility to breakage during transportation, there is a need to develop a new, low-cost, and structurally robust composite filter cartridge. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a composite filter element that can improve the structural stability of the composite filter element and reduce the manufacturing cost.

[0004] The specific technical solution of this utility model embodiment is as follows:

[0005] A composite filter element, comprising:

[0006] The housing has an opening at one end, and a water connector is provided at the opening. The water connector has a raw water channel, a pure water channel, and a wastewater channel.

[0007] A fine filtration unit and a central tube are installed inside the housing. A pure water passage is formed on the wall of the central tube. The fine filtration unit is sleeved on the central tube. A raw water cavity is formed between the fine filtration unit and the housing, which communicates with the raw water channel. A pure water cavity is defined inside the central tube. Wastewater generated after filtration by the fine filtration unit is output through the wastewater channel.

[0008] An inner tube is disposed inside the central tube. A post-filter unit is provided inside the inner tube. An outlet chamber communicating with the pure water channel is formed inside the inner tube. A gap is formed between the central tube and the inner tube, and the gap is communicating with the inner tube.

[0009] Preferably, the post-filtration unit is granular activated carbon.

[0010] Preferably, the inner tube is provided with a water inlet communicating with the gap.

[0011] Preferably, the central tube has a first end near the water inlet and a second end away from the water inlet, the second end being closed.

[0012] Preferably, the inner tube has a first water inlet on its wall, and the inner tube has a third end near the water connector and a fourth end away from the water connector. The fourth end faces the second end and has a second water inlet.

[0013] Preferably, the inlet is further provided with a blocking element to prevent the granular activated carbon from moving toward the inlet.

[0014] Preferably, the blocking element comprises a non-woven fabric, which is ultrasonically welded at the water inlet, and the water flowing out from the gap enters the inner tube after passing through the non-woven fabric.

[0015] Preferably, the first water inlet is located near the fourth end.

[0016] Preferably, an abutting portion is provided between the second end and the fourth end.

[0017] Preferably, the fourth end is provided with an abutment portion extending circumferentially along the inner tube, the abutment portion being located at the lower part of the inner tube.

[0018] Preferably, the fourth end is abutted against the second end by the abutting portion.

[0019] Preferably, the composite filter element further includes a pre-filter unit, which is radially disposed outside the fine filter unit.

[0020] Preferably, the third end has a water outlet, and the water flowing out from the gap enters the inner tube after passing through the water inlet. After being filtered by the granular activated carbon, the water flows into the pure water channel through the water outlet for output.

[0021] The technical solution of this utility model has the following significant beneficial effects:

[0022] The composite filter element in this application employs a fine filtration unit and an inner tube for filling granular activated carbon arranged radially. Granular activated carbon replaces carbon rods, thus solving the problem of carbon rods easily breaking during transportation and reducing the manufacturing cost of using carbon rods as a post-filtration unit. Simultaneously, due to the concentric structure of the composite filter element, the post-filtration unit is constrained to a slender structure. By setting a first inlet on the wall of the inner tube and a second inlet at the end of the inner tube, most of the pure water produced by the fine filtration unit flows through the second inlet, thereby extending the water path and achieving a higher removal rate of impurities in the water. A small portion of the pure water produced by the fine filtration unit flows through the first inlet, thereby shortening the water path, reducing water resistance, and increasing the outlet flow rate. Through the parallel inlet structure of the first and second inlets, the filtration effect of the composite filter element in removing impurities from the water can be guaranteed, while simultaneously meeting the required outlet flow rate. Attached Figure Description

[0023] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0024] Figure 1 This is a cross-sectional structural diagram of the composite filter element in an embodiment of this utility model;

[0025] Figure 2 This is a three-dimensional structural diagram of the inner tube in an embodiment of the present utility model;

[0026] Figure 3 This is a schematic cross-sectional view of the inner tube in an embodiment of the present invention.

[0027] Figure 4 This is a bottom view of the inner tube in an embodiment of this utility model;

[0028] Figure 5 This is a top view of the inner tube in an embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the central tube in an embodiment of this utility model;

[0030] Figure 7 This is an exploded view of the composite filter element (without a housing) in an embodiment of this utility model.

[0031] The reference numerals in the above figures are as follows: 1. Pre-filter unit; 2. Fine filter unit; 3. Post-filter unit; 4. Housing; 41. Opening; 5. Water connector; 51. Raw water channel; 52. Pure water channel; 53. Wastewater channel; 6. Central pipe; 61. Pure water through hole; 62. First end; 63. Second end; 7. Inner pipe; 71. First inlet; 72. Second inlet; 73. Outlet; 74. Contact part; 75. Third end; 76. Fourth end; 77. Outlet chamber; 8. Raw water chamber; 9. Pure water chamber; 91. Gap. Detailed Implementation

[0032] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0033] This application proposes a composite filter element. Figure 1 This is a cross-sectional view of the composite filter element in an embodiment of the present invention. Figure 7 This is an exploded view of the composite filter element (without a housing) in an embodiment of this utility model. Figure 1 and Figure 7 As shown, the composite filter element may include: a housing 4, a water connector 5, a fine filtration unit 2, a central tube 6, an inner tube 7, and a post-filtration unit 3. The housing 4 houses the fine filtration unit 2, the central tube 6, the inner tube 7, and the post-filtration unit 3. One end of the housing 4 has an opening 41, at which the water connector 5 is located. The water connector 5 is used to connect with the water interface on the water circuit board of the water purification device. The opening 41 of the housing 4 can be detachably connected to the water circuit board by rotation or insertion. The water connector 5 can also be detachably installed at the opening 41 of the housing 4 by insertion or rotation. The water connector 5 has a raw water channel 51, a pure water channel 52, and a wastewater channel 53. The raw water channel 51 is used to input raw water into the housing 4, the pure water channel 52 is used to export the pure water formed after the housing 4 has been filtered by the fine filtration unit 2 and the post-filtration unit 3 to the outside of the housing 4, and the wastewater channel 53 is used to export the wastewater formed during the filtration of the fine filtration unit 2 to the outside of the housing 4.

[0034] Alternatively, the composite filter element may further include a pre-filtration unit 1, which performs primary filtration of the raw water. This pre-filtration unit 1 removes impurities from the raw water, such as sediment, rust, suspended solids, and other small particulate impurities, and also adsorbs odors, discoloration, residual chlorine, and some harmful substances in the water. The pre-filtration unit 1 may include at least one of the following: a PP cotton filter unit, an activated carbon filter unit, etc. Figure 1As shown, the pre-filter unit 1, fine filter unit 2, central tube 6, inner tube 7, and post-filter unit 3 are disposed within the housing 4. The fine filter unit 2 is used to further filter the water filtered by the pre-filter unit 1, removing smaller particles from the water. The fine filter unit 2 can be any filter unit that needs to discharge wastewater during filtration; for example, it can include at least one of the following: a reverse osmosis membrane filter unit, a nanofiltration membrane filter unit, an ultrafiltration membrane filter unit, etc. When the pre-filter unit 1 includes a PP cotton filter unit, the PP cotton filter unit is wound around the outer wall of the fine filter unit 2. In this way, during the manufacturing of the pre-filter unit 1, the pre-filter unit 1 can be directly integrated with the fine filter unit 2, forming a single component, facilitating the subsequent assembly of the filter cartridge.

[0035] like Figure 1 , Figure 6 and Figure 7As shown, the fine filtration unit 2 is wound around the central tube 6, and the pre-filtration unit 1 is radially arranged outside the fine filtration unit 2. A raw water chamber 8 is formed between the pre-filtration unit 1 and the inner wall of the housing 4. The axial direction of the pre-filtration unit 1, the fine filtration unit 2, the central tube 6, the inner tube 7, and the post-filtration unit 3 is the same as the axial direction of the housing 4, all being vertical. The raw water in the raw water chamber 8 can flow radially into the pre-filtration unit 1 for filtration. The filtered water then flows radially into the raw water end of the fine filtration unit 2. The wastewater produced by the fine filtration unit 2 after filtration is discharged from the wastewater end of the fine filtration unit 2, then flows into the wastewater channel 53 and is discharged from the housing 4. A pure water chamber 9 is defined within the central tube 6. A pure water through-hole 61 is formed on the wall of the central tube 6. An inner tube 7 is inserted inside the central tube 6, with its axial direction being the same as that of the central tube 6. A gap 91 is formed between the central tube 6 and the inner tube 7. An outlet chamber 77, communicating with the pure water channel 52, is formed within the inner tube 7. A post-filter unit 3 is installed within the inner tube 7, and an inlet communicating with the gap 91 is provided. The pure water produced after filtration by the fine filtration unit 2 flows into the pure water chamber 9 defined within the central tube 6 through the pure water through-hole 61, then flows into the inner tube 7 through the inlet via the gap 91, and finally flows into the pure water channel 52 for output after filtration by the post-filter unit 3. The post-filter unit 3 is used to perform functional treatment on the pure water filtered by the fine filtration unit 2. As feasible, the post-filter unit uses granular activated carbon, which can improve the taste. Existing technology uses carbon rods as post-filter units. Since carbon rods are made by sintering powdered activated carbon, the manufacturing cost is relatively high. Moreover, due to the concentric structure of the composite filter element, the post-filter unit is restricted to a slender structure. When carbon rods are used as post-filter units, they are more prone to breakage during transportation because of their slender structure. Therefore, using granular activated carbon instead of carbon rods as post-filter units solves the problem of carbon rods being prone to breakage during transportation and also reduces the manufacturing cost of using carbon rods as post-filter units.

[0036] While using granular activated carbon instead of carbon rods offers the aforementioned advantages, it also presents some technical challenges. Due to the concentric structure of the composite filter cartridge, the post-filter unit is limited to a slender structure. When carbon rods are used for filtration in the post-filter unit, the carbon rods are tubular, with the outer wall serving as the inlet and the inner wall as the outlet. The filtration area of ​​the carbon rod is its entire outer circumference, eliminating the flow restriction issue. However, when using granular activated carbon as the post-filter unit, the flow restriction problem needs to be addressed while simultaneously ensuring its filtration efficiency.

[0037] Figure 6 This is a schematic diagram of the structure of the central tube in an embodiment of this utility model. Figure 2 This is a three-dimensional structural diagram of the inner tube in an embodiment of the present invention. Figure 3This is a schematic cross-sectional view of the inner tube in an embodiment of this utility model. Figure 4 This is a bottom view of the inner tube in an embodiment of this utility model. Figure 5 This is a top view of the inner tube in an embodiment of this utility model, as shown below. Figure 6 , Figures 1 to 5 As shown, the central tube 6 has a first end 62 near the water connector 5 and a second end 63 away from the water connector 5. The second end 63 is closed. The inner tube 7 has a third end 75 near the water connector 5 and a fourth end 76 away from the water connector 5. The fourth end 76 faces the second end 63 and is located below the second end 63. An abutment portion 74 may be provided between the second end 63 and the fourth end 76 to limit the inner tube 7. In this embodiment, the lower part of the inner tube 7 may include a plurality of abutment portions 74. The plurality of abutment portions 74 extend circumferentially along the inner tube 7 and are located at the fourth end 76. The fourth end 76 abuts against the second end 63 through the plurality of abutment portions 74.

[0038] like Figures 1 to 3 As shown, the inner tube 7 has an inlet communicating with the gap 91. The inner tube 7 has a first inlet 71 on its wall and a second inlet 72 at its fourth end 76. Most of the pure water produced by the fine filtration unit 2 flows through the gap 91 and into the inner tube 7 via the second inlet 72, thus extending the water path in contact with the granular activated carbon and achieving a higher removal rate of impurities in the water. A small portion of the pure water produced by the fine filtration unit 2 flows through the first inlet 71, thus shortening the water path into the inner tube 7, reducing water resistance, and increasing the outlet flow rate. The parallel inlet structure of the first inlet 71 and the second inlet 72 ensures both the filtration effect of the composite filter in removing impurities from the water and meets the outlet flow rate requirements of the composite filter. As a feasible approach, to further improve the filtration effect of the composite filter in removing impurities while meeting the outlet flow rate requirements, the first inlet 71 is positioned close to the fourth end 76, maximizing the extension of the water path in contact with the granular activated carbon for the small portion of water flowing through the first inlet 71. To prevent the granular activated carbon in the inner tube 7 from leaking out of the inlet, the inlet can have a blocking element to prevent the granular activated carbon from moving into the inlet of the inner tube 7. The blocking element may include non-woven fabric. The non-woven fabric is ultrasonically welded to the inlet, and the water flowing out from the gap 91 passes through the non-woven fabric and enters the inner tube 7. Ultrasonic welding ensures a strong connection between the non-woven fabric and the inlet. The inner tube 7 has a third end 75 near the water connector 5, and the third end 75 has an outlet 73. The water entering the inner tube 7 is filtered by the granular activated carbon and then flows into the pure water channel 52 through the outlet 73 for output. Furthermore, to prevent the granular activated carbon in the inner tube 7 from leaking out of the outlet, the outlet 73 may also have a blocking element, which includes non-woven fabric, and the non-woven fabric is ultrasonically welded to the outlet 73.

[0039] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1.A composite filter core, comprising: a housing, one end of the housing being formed with an opening, a waterway connector being arranged at the opening, the waterway connector having a raw water passage, a pure water passage and a waste water passage therein; a fine filter unit and a center pipe arranged in the housing, the center pipe being formed with a pure water through hole on a wall thereof, the fine filter unit being sleeved on the center pipe, a raw water cavity communicating with the raw water passage being formed between the fine filter unit and the housing, a pure water cavity being defined in the center pipe, waste water generated after being filtered by the fine filter unit being output through the waste water passage; and an inner pipe arranged in the center pipe, the inner pipe being provided with a post-filtering unit therein, a water outlet cavity communicating with the pure water passage being formed in the inner pipe, a gap being formed between the center pipe and the inner pipe, the gap communicating with the inner pipe. 2.The composite filter core according to claim 1, wherein the post-filtering unit is a granular activated carbon. 3.The composite filter core according to claim 2, wherein the inner pipe is provided with a water inlet communicating with the gap. 4.The composite filter core according to claim 3, wherein the center pipe has a first end close to the waterway connector and a second end away from the waterway connector, the second end being closed. 5.The composite filter core according to claim 4, wherein the wall of the inner pipe is provided with a first water inlet, the inner pipe has a third end close to the waterway connector and a fourth end away from the waterway connector, the fourth end being towards the second end, the fourth end being provided with a second water inlet. 6.The composite filter core according to claim 3, wherein the water inlet is further provided with a blocking piece for blocking the granular activated carbon from moving to the water inlet. 7.The composite filter core according to claim 6, wherein the blocking piece comprises a non-woven fabric, the non-woven fabric being arranged at the water inlet by ultrasonic welding, water flowing out from the gap entering the inner pipe after passing through the non-woven fabric. 8.The composite filter core according to claim 5, wherein the first water inlet is close to the fourth end. 9.The composite filter core according to claim 5, wherein an abutting portion is arranged between the second end and the fourth end. 10.The composite filter core according to claim 5, wherein the fourth end is provided with an abutting portion extending along a circumferential direction of the inner pipe, the abutting portion being located at a lower portion of the inner pipe. 11.The composite filter core according to claim 10, wherein the fourth end is abutted at the second end through the abutting portion. 12.The composite filter core according to claim 1, further comprising: a pre-filtering unit, the pre-filtering unit being arranged radially outside the fine filter unit. 13.The composite filter core according to claim 5, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The third end has a water outlet, water flowing from the gap enters the inner tube after passing the water inlet, and water filtered by the granular activated carbon flows into the pure water channel through the water outlet and is output.

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