A multifunctional composite central tube

Abstract

The present invention provides a multifunctional composite central tube, comprising a body with a cavity inside, one end of the body being a first water outlet connected to the cavity, the other end of the body being provided with a partition plate sealing the cavity, a water inlet hole being provided on the body between the first water outlet and the partition plate, the water inlet hole being connected to the cavity, a first filter portion being provided in the cavity between the first water outlet and the partition plate, and / or a second filter portion covering the water inlet hole being provided on the outer side of the body. The present invention solves the first problem existing in the prior art: how to make the central tube have the function of reprocessing water filtered by the RO membrane and reduce the volume of the filtering equipment.

Description

Technical Field

[0001] The invention relates to the technical field of water filtering equipment, and in particular to a multifunctional composite central tube. Background Art

[0002] In the prior art, water filtered by an RO membrane needs to be reprocessed, and usually a reprocessing device and / or component and / or filter element is added after the filtering device including the RO membrane, and the water filtered by the RO membrane is reprocessed again through a post-filtration device (including but not limited to removing residual chlorine and / or removing impurities and / or improving the pH value of the water body, etc.), such as subsequently adding a separate carbon rod filter element to adsorb residual chlorine and / or adding a non-woven fabric to adsorb impurities, etc., which makes the entire water filter machine bulky, and the lifespan of the filter elements with different functions is different, and the cost of replacing the filter element consumables and the labor cost are high.

[0003] Therefore, how to make the central tube have the function of reprocessing the water filtered by the RO membrane and reduce the volume of the filtering equipment has become a problem that needs to be solved.

[0004] In addition, how to realize the detachable connection of the central tube to facilitate the installation of the central tube and the loading and unloading of the reprocessing filter part has become a problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a multifunctional composite central tube, which mainly solves the problem of the above-mentioned prior art: how to make the central tube have the function of reprocessing water after RO membrane filtration and reduce the volume of the filtering equipment; the second problem is how to realize the detachable connection of the central tube to facilitate the installation and loading and unloading of the reprocessing filter part of the central tube, and provides a multifunctional composite central tube.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A multifunctional composite central tube comprises a main body with a cavity therein, one end of the main body being a first water outlet connected to the cavity, the other end of the main body being provided with a partition plate sealing the cavity, a water inlet hole being provided on the main body between the first water outlet and the partition plate, the water inlet hole being connected to the cavity, and characterized in that a first filter portion is provided in the cavity between the first water outlet and the partition plate and / or a second filter portion covering the water inlet hole is provided on the outer side of the main body.

[0008] Furthermore, the body between the first water outlet and the partition plate is detachably connected by two or more parts.

[0009] Furthermore, the body between the first water outlet and the partition plate is divided into a first part and a second part which are detachably connected, the first part is a tube body with an opening on the side, and the second part is a cover body for matching with the opening.

[0010] Furthermore, the first part and the second part are connected by a snap-fit ​​method; the cross section of the main body formed after the opening and the cover are installed is circular, and the cross section of the first part and the cross section of the second part each occupy half of the circle;

[0011] The inner side wall of the first part close to the opening is provided with a first buckle part A, and the peripheral edge of the second part is provided with a first buckle part B matching the first buckle part A;

[0012] The opening is close to the partition plate, and the body between the opening and the first water outlet is a fixing part for fixing the first filter part.

[0013] Further, the first filter portion has an end near the first water outlet provided with a second water outlet extending outward, the second water outlet of the first filter portion is embedded in the first water outlet of the body, and an outer side wall of the second water outlet of the first filter portion is provided with a sealing ring for sealing with an inner side wall of the first water outlet of the body;

[0014] and / or the length of the opening is greater than or equal to the length of the first filter portion, and the cavity diameter of the main body is greater than or equal to the outer wall diameter of the first filter portion;

[0015] and / or the first filter part is a carbon rod filter element, or a tea bag filter element with carbon powder or mineralized balls, or an ultrafiltration membrane filter element, or a filter element with heavy metal adsorption function, or a PP cotton filter element, or a folded filter element, or a filter element with resin, granular carbon, powdered carbon, or carbon fiber, and the second filter part is a filter element formed by wrapping a carbon rod with non-woven fabric;

[0016] Or the first filter part (4) is composed of an RO reverse osmosis filter element or a nanofiltration filter element, a water seal (4-7) is provided between the first filter part (4) and the inner wall of the cavity (1-1) of the main body (1), and a wastewater discharge outlet (2-8) is provided at one end of the main body (1) where the first water outlet (1-2) is located.

[0017] Furthermore, the body between the first water outlet and the partition plate is divided into a first part and a second part which are detachably connected.

[0018] Furthermore, the first part and the second part are connected by a screw-on method or a snap-on method; a circle of second slots is provided on the inner side wall of one end of the first part connected to the second part, an outwardly extending embedded part is provided on one end of the second part connected to the first part, and a second snap-on part is provided on the outer side wall of the embedded part to form a snap-on connection with the second slot;

[0019] And / or the end where the first part is connected to the second part has more than two first protrusions, and the end where the second part is connected to the first part is provided with a first concave step portion matching the first protrusions.

[0020] Furthermore, the embedding portion is in the shape of a hollow tube, and a circle of second buckle portions is provided on the outer side wall of the embedding portion;

[0021] And / or a third clamping groove is arranged on the inner side wall of the first protruding portion, and a third buckle portion matching the third clamping groove is arranged on the outer side wall of the first step portion.

[0022] Further, the diameter of the outer wall of the embedded part is smaller than the diameter of the outer wall of the second part, the inside of the embedded part is connected to the cavity of the first part and the cavity of the second part, the diameter of the inner wall of the embedded part is equal to the cavity diameter of the first part and the cavity diameter of the second part; the diameter of the outer wall of the first part is equal to the diameter of the outer wall of the second part; the length of the cavity of the body is greater than or equal to the length of the first filter part;

[0023] and / or the first filter part is a carbon rod filter element, or a tea bag filter element with carbon powder or mineralized balls, or an ultrafiltration membrane filter element, or a filter element with heavy metal adsorption function, or a PP cotton filter element, or a folded filter element, or a filter element with resin, granular carbon, powdered carbon, or carbon fiber, and the second filter part is a filter element formed by wrapping a carbon rod with non-woven fabric;

[0024] Or the first filter part (4) is composed of an RO reverse osmosis filter element or a nanofiltration membrane filter element, a water seal (4-7) is provided between the first filter part (4) and the inner wall of the cavity (1-1) of the main body (1), and a wastewater outlet (2-8) is provided at one end of the main body (1) where the first water outlet (1-2) is located.

[0025] Furthermore, a circle of second step portions is provided on the outer side surface of one end of the first part connected to the second part, and a circle of third step portions is provided on the outer side surface of one end of the second part connected to the first part. When the first part is connected to the second part, the second step portions and the third step portions jointly form an installation groove for setting the second filter part.

[0026] In view of the above technical features, the present invention has the following beneficial effects:

[0027] 1. A multifunctional composite central tube of the present invention realizes the required reprocessing function by adding a filter part (such as a first filter part and a second filter part) inside and / or on the outer surface of the central tube, so that the central tube has the function of reprocessing water after RO membrane filtration (including but not limited to removing residual chlorine and / or removing impurities and / or improving the pH value of the water body, etc.), and there is no need to separately set up reprocessing filter elements or components with various functions, which saves costs and greatly reduces the space occupied by the entire filtering equipment.

[0028] 2. Since there is no post-installed reprocessing filter element or component with various functions, the problem of replacement of the post-installed reprocessing filter element or component is avoided, the cost of consumables and labor costs are saved, and the product of the present invention is more affordable.

[0029] 3. Since there is no post-installation of reprocessing filter elements or components with various functions, the problem of needing to replace the post-installed reprocessing filter elements or components at different time limits due to different service lives is avoided (it is often easy to replace one or several post-installed reprocessing individual filter elements, which easily leads to damage to the RO diaphragm and large losses). The product of the present invention only needs to replace the multifunctional composite central tube and the RO diaphragm thereon at one time, which saves labor costs for replacement, is more convenient to replace, and reduces the possibility of damage to the RO diaphragm. It also avoids the problem of high-frequency replacement due to filter elements with different functions.

[0030] 4. A multifunctional composite central tube of the present invention has a main body between the first water outlet and the partition plate, which is detachably connected by two or more parts (whether the side opening and the cover are detachably connected, or the first part and the second part are detachably connected), which is convenient for the installation of the central tube, loading and unloading of the reprocessing filter part (such as the first filter part in the inner cavity of the central tube, and the second filter part wrapping the outer wall of the central tube). BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a multifunctional composite central tube in Example 1. Figure 1 (The opening and cover are provided on the side of the body, before the first filter is installed);

[0032] Figure 2 yes Figure 2 sectional view of

[0033] Figure 3 This is a schematic diagram of the structure of a multifunctional composite central tube in Example 1. Figure 2 (The opening and cover are provided on the side of the body, before the first filter is installed);

[0034] Figure 4 is a schematic structural diagram of the first filter unit in Example 1;

[0035] Figure 5 It is a schematic diagram of the structure of the filter element of the first filter unit in Example 1.

[0036] Figure 6 This is an exploded view of a multifunctional composite central tube in Example 1 (an opening and a cover are provided on the side of the main body);

[0037] Figure 7 It is a cross-sectional view of a multifunctional composite central tube in Example 1 (an opening and a cover are provided on the side of the main body, and a first filter part is installed);

[0038] Figure 8 This is a schematic diagram of the structure of a multifunctional composite central tube in Example 1. Figure 3 (The opening and cover are provided on the side of the body, and the first filter is installed);

[0039] Fig. 9 This is a schematic diagram of the structure of a multifunctional composite central tube in Example 1. Figure 4 (An opening is provided on the side of the body to install the first filter);

[0040] Fig.10 It is a three-dimensional multifunctional composite central tube in Example 2. Figure 1 (The first and second parts in disassembled state before installation, two viewing angles);

[0041] Fig.11 It is a three-dimensional multifunctional composite central tube in Example 2. Figure 2 (After installing the first and second parts);

[0042] Fig.12 yes Fig.11 A cross-sectional view of

[0043] Fig.13 It is a three-dimensional multifunctional composite central tube in Example 2. Figure 3 and the main view (disassembled state of the first and second parts before installation, two viewing angles);

[0044] Fig.14 This is a cross-sectional view of a multifunctional composite central tube in Example 2 (after the first part and the second part are installed, and the first filter part is provided inside)

[0045] Fig.15 It is a three-dimensional multifunctional composite central tube in Example 3. Figure 1 and main view Figure 1 (The first and second parts in disassembled state before installation, two viewing angles);

[0046] Fig.16 It is a three-dimensional multifunctional composite central tube in Example 3. Figure 2 and main view Figure 2 (Disassembled state of the first and second parts before installation, two viewing angles, and showing the second filter part);

[0047] Fig.17 It is a three-dimensional multifunctional composite central tube in Example 3. Figure 3 and main view Figure 3 (Two viewing angles after the first and second parts are installed, and the second filter part is displayed);

[0048] Fig.18is a cross-sectional view of a multifunctional composite central tube in Example 3 (after the first part and the second part are installed, and the second filter part is externally provided);

[0049] Fig.19 It is a cross-sectional view of a multifunctional composite central tube in Example 5 (the built-in first filter part is an RO membrane filter element or a nanofiltration membrane filter element).

[0050] In the figure: 1, body; 1-1, cavity; 1-2, first water outlet; 1-3, partition plate; 1-4, water inlet;

[0051] 2. First part; 2-1. First buckle part A; 2-2. Second card slot; 2-3. First protrusion; 2-4. Second step part; 2-5. Fixing part; 2-6. Inner concave part; 2-7. Opening part; 2-8. Wastewater outlet;

[0052] 3. Second part; 3-1. First buckle portion B; 3-2. Embedded portion; 3-2-1. Second buckle portion; 3-3. First step portion; 3-4. Third step portion; 3-6. Second protruding portion;

[0053] 4. First filter section; 4-1. Second water outlet; 4-2. Sealing ring; 4-3. Resin particles; 4-4. Filter element; 4-5. Central tube of first filter section; 4-5-1. Water inlet of central tube of first filter section; 4-5-2. Partition plate of central tube of first filter section; 4-6. RO reverse osmosis membrane of first filter section; 4-7. Water seal;

[0054] 5. Second filter section. DETAILED DESCRIPTION

[0055] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0056] See also Figures 1 to 10, Specific embodiment 1, this embodiment 1 provides a multifunctional composite central tube, including a main body 1 with a cavity 1-1 therein, one end of the main body 1 is a first water outlet 1-2 connected to the cavity 1-1, the other end of the main body 1 is provided with a partition plate 1-3 that seals the cavity 1-1, a water inlet hole 1-4 is provided on the main body 1 between the first water outlet 1-2 and the partition plate 1-3, the water inlet hole 1-4 is connected to the cavity 1-1, the main body 1 between the first water outlet 1-2 and the partition plate 1-3 is detachably connected by more than two parts, and a first filter part 4 is provided in the cavity 1-1 between the first water outlet 1-2 and the partition plate 1-3; at this time, the main body 1 between the first water outlet 1-2 and the partition plate 1-3 is detachably connected by more than two parts, so that the first filter part 4 can be installed in the cavity 1-1, and the installation is convenient.

[0057] The partition plate 1-3 seals one end of the inner cavity of the main body 1 (i.e., the cavity 1-1), and separates the inner cavity from the external space of the central tube at this end. When water that needs to be filtered again (such as water that has been filtered for the first time by the RO reverse osmosis membrane) is filtered again through the second filter part 5 and enters the inner cavity of the main body 1 through the water inlet hole 1-4, and / or is filtered again through the first filter part 4 and flows out of the central tube through the first water outlet 1-2.

[0058] Preferably, the main body 1 between the first water outlet 1-2 and the partition plate 1-3 is divided into a first part 2 and a second part 3 which are detachably connected, mainly for setting a first filter part 4 in the cavity 1-1 corresponding to the water inlet hole 1-4, so that the water entering the cavity 1-1 through the water inlet hole 1-4 is filtered by the first filter part 4 (i.e., the reprocessing operation), and then flows out of the multifunctional composite central tube through the first water outlet 1-2, thereby achieving the purpose of re-filtration in the central tube (i.e., the purpose of reprocessing), enabling the central tube to have a reprocessing function and become a functional composite central tube. In this embodiment 1, the first part 2 is a tube body with an opening 2-7 on the side, and the second part 3 is a cover body for matching the opening 2-7. The "matching" here means that the opening 2-7 of the first part 2 is installed with the second part 3 (i.e., the cover body) to form a complete tube body shape (i.e., the tube-shaped main body 1 is actually a part of the main body 1), and the shapes, specifications, sizes, etc. of the two are matched.

[0059] The opening portion 2-7 is used to place the first filter portion 4 into the cavity 1-1. After the first filter portion 4 is placed in the cavity 1-1, the cover body is used to cover the opening portion 2-7 to close the opening portion 2-7 and ensure that the first filter portion 4 is completely placed in the cavity 1-1; at this time, a water inlet hole 1-4 can also be set on the cover body (i.e., the second part 3) to increase the speed of water entering the cavity 1-1.

[0060] The first part 2 and the second part 3 are connected by a snap-fit ​​manner. For example, the inner wall of the first part 2 close to the opening part 2-7 is provided with a first snap-fit ​​part A 2-1, and the peripheral edge of the second part 3 is provided with a first snap-fit ​​part B 3-1 matching the first snap-fit ​​part A 2-1. That is to say, the positions of the first snap-fit ​​part A 2-1 and the first snap-fit ​​part B 3-1 correspond to each other, and can cooperate with each other to form a detachable snap-fit ​​structure, thereby realizing a detachable connection between the first part 2 and the second part 3. Preferably, a first snap-in portion A 2-1 is respectively provided on the inner side wall of the upper edge and the inner side wall of the lower edge of the opening portion 2-7 (that is, a first snap-in portion A 2-1 is respectively provided on the inner side walls of the two corresponding long edges of the opening portion 2-7), and a first snap-in portion B 3-1 is respectively provided on the upper edge and the lower edge of the cover body (that is, a first snap-in portion B 3-1 is respectively provided on the two corresponding long edges of the cover body). The two first snap-in portions A 2-1 and the two first snap-in portions B 3-1 are matched one by one, so that the upper edge of the opening portion 2-7 is snap-fitted with the upper edge of the cover body, and the lower edge of the opening portion 2-7 is snap-fitted with the lower edge of the cover body, thereby facilitating the installation and disassembly between the opening portion 2-7 and the cover body. In this way, by selecting the long edges to set the snap-in portions, the snap-fitting effect is more stable.

[0061] The cross section of the main body 1 formed after the opening 2-7 and the cover are installed is circular, and the cross section of the first part 2 and the cross section of the second part 3 each occupy half of the circle. At this time, the cooperation between the opening 2-7 and the cover can maximize the installation of the first filter part 4 with a large outer wall diameter (that is, when the outer wall diameter of the first filter part 4 is equal to the inner diameter of the cavity 1-1, the volume of the first filter part 4 is the largest, and the filtering effect of the first filter part 4 is correspondingly better). In other words, when the outer wall diameter of the first filter part 4 is less than or equal to the inner diameter of the cavity 1-1 formed by the opening 2-7 and the cover, the first filter part 4 can be installed in the inner body. After the opening 2-7 and the cover form the cavity 1-1, the hardness of the cavity 1-1 of the main body 1 can still be maintained, and the stability is good. For example, the main body 1 (including the first part 2 and the second part 3) of the multifunctional composite central tube is made of ABS resin.

[0062] At this time, the length of the opening 2-7 is greater than or equal to the length of the first filter 4, and the diameter of the cavity 1-1 of the main body 1 is greater than or equal to the outer wall diameter of the first filter 4. In this embodiment 1, preferably, the length of the opening 2-7 is equal to the length of the first filter 4, which not only meets the requirements for installing the first filter 4, but also can control the size of the opening 2-7 to the maximum extent and maintain the stability of the first part 2. The diameter of the cavity 1-1 of the main body 1 is equal to the outer wall diameter of the first filter 4, so that the first filter 4 can be fully filled in the cavity 1-1, the capacity of the first filter 4 is increased as much as possible, the water entering the cavity 1-1 is more fully filtered, and the filtering effect of the first filter 4 is improved.

[0063] Preferably, the opening 2-7 is close to the partition plate 1-3, and the main body 1 between the opening 2-7 and the first water outlet 1-2 is a fixing part 2-5 for fixing the first filter part 4, that is, the fixing part 2-5 is a part of the main body 1 and is still in a complete tubular shape. The second water outlet 4-1 of the first filter part 4 (for example, a cylindrical carbon rod filter element) corresponds to the direction of the first water outlet 1-2 of the main body 1, and then after being placed into the cavity 1-1 through the opening 2-7, the first filter part 4 is pushed along the cavity 1-1 toward the first water outlet of the main body 1. The fixing portion 2-5 moves in the direction of 1-2 until the second water outlet 4-1 is embedded in the first water outlet 1-2. One end of the first filter portion 4 provided with the second water outlet 4-1 is embedded in the cavity 1-1 of the main body 1 corresponding to the fixing portion 2-5. The fixing portion 2-5 fixes the position of the first filter portion 4. At this time, even if the cover body and the opening portion 2-7 are not closed, the first filter portion 4 will not fall out of the cavity 1-1 due to the fixing effect of the fixing portion 2-5. There is no need to perform additional auxiliary fixing on the first filter portion 4. The cover body and the opening portion 2-7 can be closed later.

[0064] A second water outlet 4-1 extending outward is provided at one end of the first filter part 4 close to the first water outlet 1-2, and the second water outlet 4-1 of the first filter part 4 is embedded in the first water outlet 1-2 of the main body 1, so as to fix the position between the first filter part 4 and the main body 1 in the vertical direction, thereby playing a positioning role and also helping the water filtered by the first filter part 4 to flow out through the first water outlet 1-2 of the main body 1 as soon as possible, thereby preventing the water filtered by the first filter part 4 from flowing back into the inner cavity of the main body 1 and reducing the filtration efficiency of the first filter part 4 (i.e., the efficiency of reprocessing).

[0065] The outer wall of the second water outlet 4-1 of the first filter part 4 is provided with a sealing ring 4-2, such as an O-ring 4-2, for sealing with the inner wall of the first water outlet 1-2 of the main body 1. The sealing ring 4-2 prevents water in the inner cavity of the main body 1 that has not been filtered by the first filter part 4 from flowing out of the first water outlet 1-2 through the gap between the second water outlet 4-1 and the first water outlet 1-2, thereby avoiding contamination of water that has been filtered by the first filter part 4.

[0066] The first filter part 4 is a carbon rod filter element, a tea bag filter element with carbon powder or mineralized balls, an ultrafiltration membrane filter element, a filter element with heavy metal adsorption function, a PP cotton filter element, a folded filter element, or a filter element with resin, granular carbon, powdered carbon, or carbon fiber. The filter element 4-4 of the first filter part 4 in this embodiment 1 is a filter element with built-in resin granules 4-3 filter material (see Figure 5), the first filter part 4 can be used to absorb organic matter, remove odor, remove bacteria, inhibit bacteria, remove heavy metals, remove residual chlorine, adjust the pH value of water to be weakly alkaline, etc., which is more beneficial to human health. The tea bag filter element can take advantage of its small size to fully fill the cavity 1-1 of the central tube, with a high filling degree, so that the filtering effect of the first filter part 4 is better.

[0067] The design of setting the first filter part 4 in the cavity 1-1 in the multifunctional composite central tube integrates the first filter part 4 and the multifunctional composite central tube, saves space, eliminates the subsequent post-filter device of the multifunctional composite central tube, reduces the volume of the water purifier as a whole, makes the water purifier as a whole more miniaturized, and also reduces the production cost of the water purifier as a whole.

[0068] If the multifunctional composite central tube is used in an RO membrane filter element (i.e., an RO reverse osmosis filter element), the RO reverse osmosis membrane is wrapped around the outer side of the main body 1. After the raw water is filtered for the first time by the RO reverse osmosis membrane, it enters the cavity 1-1 of the main body 1 through the water inlet 1-4. The water filtered for the first time by the RO reverse osmosis membrane in the cavity 1-1 is filtered again by the first filter part 4, and then enters the first water outlet 1-2 through the second water outlet 4-1 of the first filter part 4. The clean water after the second filtration is discharged from the first water outlet 1-2.

[0069] At this time, the multifunctional composite central tube can also be used in a nanofiltration membrane filter element (i.e., a nanofiltration filter element), in which the nanofiltration membrane is wrapped around the outer side of the main body 1. After the raw water is filtered for the first time by the nanofiltration membrane, it enters the cavity 1-1 of the main body 1 through the water inlet 1-4. The water filtered for the first time by the nanofiltration membrane in the cavity 1-1 is filtered again by the first filter part 4, and then enters the first water outlet 1-2 through the second water outlet 4-1 of the first filter part 4, and the clean water after the second filtration is discharged from the first water outlet 1-2.

[0070] See also Figures 11 to 14 , Specific embodiment 2, this embodiment 2 provides a multifunctional composite central tube, including a main body 1 with a cavity 1-1 therein, one end of the main body 1 is a first water outlet 1-2 connected to the cavity 1-1, the other end of the main body 1 is provided with a partition plate 1-3 that seals the cavity 1-1, a water inlet hole 1-4 is provided on the main body 1 between the first water outlet 1-2 and the partition plate 1-3, the water inlet hole 1-4 is connected to the cavity 1-1, the main body 1 between the first water outlet 1-2 and the partition plate 1-3 is detachably connected by more than two parts, and a first filter part 4 is provided in the cavity 1-1 between the first water outlet 1-2 and the partition plate 1-3; at this time, the main body 1 between the first water outlet 1-2 and the partition plate 1-3 is detachably connected by more than two parts, which is convenient for installing the first filter part 4 into the cavity 1-1, and the installation is convenient.

[0071] The body 1 between the first water outlet 1-2 and the partition plate 1-3 is divided into a first part 2 and a second part 3 which are detachably connected, and the first part 2 and the second part 3 are connected by a screw-on method or a snap-on method. In this embodiment 2, a snap-on connection is preferred, and a circle of second snap-on grooves 2-2 are provided on the inner side wall of the end where the first part 2 is connected to the second part 3, and an outwardly extending embedded portion 3-2 is provided on the end where the second part 3 is connected to the first part 2, and a second snap-on portion 3-2-1 is provided on the outer side wall of the embedded portion 3-2 to form a snap-on connection with the second snap-on groove 2-2. In this embodiment 2, preferably, the embedded portion 3-2 is in the shape of a hollow tube, and a circle of second snap-on portions 3-2-1 is provided on the outer side wall of the embedded portion 3-2. When the first part 2 is connected to the second part 3, the embedded part 3-2 is embedded in the inner cavity corresponding to the first part 2 (i.e., the cavity 1-1), and a snap connection is formed between the second snap portion 3-2-1 and the second slot 2-2, that is, the embedded part 3-2 plays a pre-installation and guiding role. In other words, as long as the embedded part 3-2 is aligned with the inner cavity position corresponding to the first part 2, and the two are pushed toward the middle, the first part 2 and the second part 3 are gradually approached along the embedded part 3-2 until the second slot 2-2 and the second snap portion 3-2-1 form a snap connection state, thereby achieving precise installation or connection between the first part 2 and the second part 3.

[0072] The end of the first part 2 connected with the second part 3 has more than two first protrusions 2-3, and the end of the second part 3 connected with the first part 2 is provided with a concave first step 3-3 matching the first protrusion 2-3. When the first part 2 is connected with the second part 3, the first protrusion 2-3 is embedded in the corresponding concave first step 3-3, which plays a positioning role and prevents the first part 2 and the second part 3 from rotating. In fact, concave parts 2-6 are also formed between adjacent first protrusions 2-3, and second protrusions 3-6 are also formed between adjacent concave first steps 3-3, and the second protrusions 3-6 are also embedded in the corresponding concave parts 2-6.

[0073] An alternative solution is to provide a third card slot (not shown in the drawings) on the inner wall of the first protrusion 2-3, and provide a third snap portion (not shown in the drawings) matching the third card slot on the outer wall of the first step portion 3-3. When the first protrusion 2-3 is embedded in the corresponding concave first step portion 3-3, in addition to playing a positioning role in preventing the first part 2 and the second part 3 from rotating and moving, it can also help to detachably connect the first part 2 and the second part 3.

[0074] The diameter of the outer wall of the embedded part 3-2 is smaller than the diameter of the outer wall of the second part 3. The interior of the embedded part 3-2 is connected to the cavity 1-1 of the first part 2 and the cavity 1-1 of the second part 3. The diameter of the inner wall of the embedded part 3-2 is the same as the diameter of the cavity 1-1 of the first part 2 and the diameter of the cavity 1-1 of the second part 3. In this way, the inner diameters of various parts of the inner cavity (i.e., the cavity 1-1) are kept the same, which is convenient for placing the cylindrical first filter part 4 (i.e., the cylindrical filter element); the diameter of the outer wall of the first part 2 and the diameter of the outer wall of the second part 3 are equal. In this way, the diameters of the outer wall of the main body 1 are kept equal, and the outer sizes are consistent, which is also convenient for the subsequent fitting of the membrane (such as RO reverse osmosis membrane) on the outer side of the multifunctional composite central tube, avoiding the formation of a gap between the RO reverse osmosis membrane and the outer side of the multifunctional composite central tube, and avoiding the unevenness or edges of the outer wall of the multifunctional composite central tube, thereby scratching or damaging the RO reverse osmosis membrane.

[0075] The first filter part 4 is a carbon rod filter element, a tea bag filter element with carbon powder or mineralized balls, an ultrafiltration membrane filter element, a filter element with heavy metal adsorption function, a PP cotton filter element, a folded filter element, or a filter element with resin, granular carbon, powdered carbon, or carbon fiber. The first filter part 4 can be used to absorb organic matter, remove odor, sterilize, inhibit bacteria, remove heavy metals, remove residual chlorine, adjust the pH value of water to be weakly alkaline, etc., which is more beneficial to human health. The tea bag filter element can fully fill the cavity 1-1 of the central tube with a high filling degree by taking advantage of its small size, so that the filtering effect of the first filter part 4 is better.

[0076] The length of the cavity 1 - 1 of the main body 1 is greater than or equal to the length of the first filter part 4 .

[0077] Taking a cylindrical carbon rod as an example, the first filter part 4 has a length equal to the length of the cavity 1-1 (the first filter part 4 is filled in the cavity 1-1 of the main body 1 as much as possible to improve the filtering efficiency of the first filter part 4). First, one end of the carbon rod is inserted into the cavity 1-1 of the first part 2, and the other end of the carbon rod is inserted into the hollow part of the embedded part 3-2. Then, the first part 2 and the second part 3 are brought close together, and then the embedded part 3-2 is embedded in the corresponding inner cavity (cavity 1-1) of the first part 2. The first part 2 and the second part 3 are continued to be brought close together until the first protrusion 2-3 is embedded in the corresponding concave first step part 3-3, the second groove 2-2 and the second buckle part 3-2-1 to form a buckle connection state, thereby completing the connection between the first part 2 and the second part 3. The operation is simple and convenient.

[0078] The cylindrical filter element can also be a rod-shaped filter element formed by non-woven fabric wrapped with carbon powder or mineralized balls or resin particles and other filter materials.

[0079] If the multifunctional composite central tube is used in the RO membrane filter element, the RO reverse osmosis membrane is wrapped on the outer side of the main body 1. After the raw water is filtered for the first time by the RO reverse osmosis membrane, it enters the cavity 1-1 of the main body 1 through the water inlet 1-4. The water filtered for the first time by the RO reverse osmosis membrane in the cavity 1-1 is filtered again by the first filter part 4, and the clean water after the second filtration is discharged from the first water outlet 1-2.

[0080] See also Figures 15 to 18 , Specific embodiment 3, this embodiment 3 provides a multifunctional composite central tube, the difference between this embodiment 3 and embodiment 2 is that: the outer side surface of the end where the first part 2 is connected to the second part 3 is provided with a circle of second step portions 2-4, and the outer side surface of the end where the second part 3 is connected to the first part 2 is provided with a circle of third step portions 3-4. When the first part 2 is connected to the second part 3, the second step portions 2-4 and the third step portions 3-4 jointly form an installation groove for setting the second filter portion 5. The second filter portion 5 in the installation groove wraps the water inlet hole 1-4, and the second filter portion 5 is a filter element formed by wrapping a carbon rod with non-woven fabric.

[0081] At this time, the first filter part 4 is set in the cavity 1-1 of the main body 1, or the first filter part 4 may not be set. In this embodiment 3, the case where the first filter part 4 is not set in the cavity 1-1 of the main body 1 is taken as an example. First, the embedded part 3-2 is embedded in the inner cavity corresponding to the first part 2, and then the first part 2 and the second part 3 are moved closer until the first protrusion 2-3 is embedded in the corresponding concave first step part 3-3, the slot and the second buckle part 3-2-1 to form a buckle connection state, completing the connection between the first part 2 and the second part 3; then, the second filter part 5 is installed in the installation slot, while wrapping the water inlet hole 1-4.

[0082] If the multifunctional composite central tube is used in the RO membrane filter element, the RO reverse osmosis membrane is wrapped around the outer side of the main body 1 and the outer side of the second filter part 5. During the wrapping process of the RO reverse osmosis membrane, the second filter part 5 can also be squeezed (for example, the filter element formed by the carbon rod and the non-woven fabric has elasticity, the second filter part 5 will not scratch the RO reverse osmosis membrane, and the filter element can be squeezed to compress the volume), and the second filter part 5 is compressed in the installation groove. After the raw water is filtered for the first time through the RO reverse osmosis membrane, it is filtered again through the second filter part 5. The clean water after the second filtration enters the cavity 1-1 of the main body 1 through the water inlet hole 1-4, and then the clean water after the second filtration is discharged from the first water outlet 1-2.

[0083] Specific embodiment 4, this embodiment 4 provides a multifunctional composite central tube, including a main body 1 with a cavity 1-1 therein, one end of the main body 1 is a first water outlet 1-2 connected to the cavity 1-1, the other end of the main body 1 is provided with a partition plate 1-3 for sealing the cavity 1-1, and a water inlet hole 1-4 is provided on the main body 1 between the first water outlet 1-2 and the partition plate 1-3, and the water inlet hole 1-4 is connected to the cavity 1-1, and is characterized in that: the main body 1 between the first water outlet 1-2 and the partition plate 1-3 is detachably connected by more than two parts, a first filter part 4 is provided in the cavity 1-1 between the first water outlet 1-2 and the partition plate 1-3 and / or the outer side of the main body 1 is provided with a second filter part 5 covering the water inlet hole 1-4.

[0084] In addition, the multifunctional composite central tube of the present invention does not need to expand the volume of the central tube (i.e., there is no need to expand or increase the volume of the cavity 1-1) regardless of whether the first filter part is installed in the inner cavity of the central tube or the second filter part is installed on the outer side of the central tube. The central tube can be connected in a detachable manner to realize the design of adding the first filter part 4 in the cavity 1-1 of the central tube or the design of adding the second filter part 5 to the outer wall of the central tube, thereby realizing a multifunctional composite central tube with a filtering function (i.e., a reprocessing function) in the central tube, which can omit subsequent more post-filtering equipment and is suitable for central tubes of various specifications and types.

[0085] Specific embodiment 5, see Fig.19 , a multifunctional composite central tube is provided in this embodiment 5. The difference between this embodiment 5 and embodiments 1 and 2 is that: the first filter part 4 is an RO reverse osmosis filter element (for example, a filter element with a filter layer formed by an RO reverse osmosis membrane) or a nanofiltration filter element (for example, a filter element with a filter layer formed by a nanofiltration membrane). In this embodiment 5, the RO reverse osmosis filter element is taken as an example. A water seal 4-7 is provided between the first filter part 4 and the inner wall of the cavity 1-1 of the main body 1. The water seal 4-7 is used to separate the space where the water that has not been filtered again by the first filter part 4 is located and the space where the sewage that has been filtered again by the first filter part 4 is located. A wastewater outlet 2-8 is provided at one end of the main body 1 where the first water outlet 1-2 is located. The sewage that has been filtered again by the first filter part 4 is discharged to the outside of the main body 1 through the wastewater outlet 2-8.

[0086] At this time, the first filter part 4 is also provided with a central tube 4-5 of the first filter part inside, the surface of the central tube 4-5 of the first filter part is provided with an RO reverse osmosis membrane 4-6 of the first filter part (i.e., the RO reverse osmosis membrane for the second filtration), the central tube 4-5 of the first filter part is provided with a water inlet hole 4-5-1 of the central tube of the first filter part, one end of the central tube 4-5 of the first filter part is opened as a second water outlet 4-1, and the second water outlet 4-1 is connected to the first water outlet 1-2, and the other end of the central tube 4-5 of the first filter part is formed by a partition plate 4-5-2 of the central tube of the first filter part, so as to form a space for the purified water after the second filtration.

[0087] If the multifunctional composite central tube is used in the RO reverse osmosis filter element, the RO reverse osmosis membrane used for the first filtration is wrapped on the outer side of the main body 1. After the raw water is filtered for the first time by the RO reverse osmosis membrane of the first filtration, it enters the cavity 1-1 of the main body 1 through the water inlet hole 1-4. The water filtered for the first time by the RO reverse osmosis membrane in the cavity 1-1 is filtered again by the RO reverse osmosis membrane 4-6 of the first filter part. The clean water after the second filtration enters the central tube 4-5 of the first filter part through the water inlet hole 4-5-1 of the central tube of the first filter part, and then flows out of the main body 1 through the second water outlet 4-1 and the first water outlet 1-2 in turn. Simultaneously, the wastewater after the second filtration is discharged to the outside of the main body 1 through the space where the sewage that has been filtered again by the first filter part 4 is located and the wastewater outlet 2-8 in turn.

[0088] In this way, the purified water filtered twice through the RO reverse osmosis membrane can improve the desalination rate.

[0089] If the first filter part adopts a nanofiltration filter element (such as a filter element with a filter layer formed by a nanofiltration membrane), the structure and principle are the same as the above case. The RO reverse osmosis membrane in the first filter part of this embodiment 5 can be replaced with a nanofiltration membrane, which can also achieve the effect of improving the desalination rate.

[0090] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A multifunctional composite central tube in an RO membrane or a nanofiltration membrane, comprising a body (1) with a cavity (1-1) therein, one end of the body (1) being a first water outlet (1-2) communicating with the cavity (1-1), the other end of the body (1) being provided with a partition plate (1-3) sealing the cavity (1-1), a water inlet hole (1-4) being provided on the body (1) between the first water outlet (1-2) and the partition plate (1-3), the water inlet hole (1-4) communicating with the cavity (1-1), characterized in that: A first filter portion (4) is provided in the cavity (1-1) between the first water outlet (1-2) and the partition plate (1-3), and a second filter portion (5) covering the water inlet hole (1-4) is provided on the outer side of the body (1); the second filter portion (5) is a filter element formed by wrapping a carbon rod with non-woven fabric; the body (1) is made of ABS resin.

2. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 1, characterized in that: A first filter portion (4) is provided in the cavity (1-1) between the first water outlet (1-2) and the partition plate (1-3) and / or the body (1) between the first water outlet (1-2) and the partition plate (1-3) is detachably connected by two or more parts.

3. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 2, characterized in that: The body (1) between the first water outlet (1-2) and the partition plate (1-3) is divided into a first part (2) and a second part (3) which are detachably connected, the first part (2) being a tube body with an opening (2-7) provided on the side, and the second part (3) being a cover body used to match the opening (2-7).

4. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 3, characterized in that: The first part (2) and the second part (3) are connected by means of a snap-fit; the cross section of the main body (1) formed after the opening (2-7) and the cover are installed is circular, and the cross section of the first part (2) and the cross section of the second part (3) each occupy half of the circle; The first part (2) is provided with a first buckle portion A (2-1) on the inner side wall close to the opening portion (2-7), and the second part (3) is provided with a first buckle portion B (3-1) matching the first buckle portion A (2-1) on the peripheral edge portions. The opening portion (2-7) is close to the partition plate (1-3), and the body (1) between the opening portion (2-7) and the first water outlet (1-2) is a fixing portion (2-5) for fixing the first filter portion (4).

5. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 4, characterized in that: A second water outlet (4-1) extending outward is provided at one end of the first filter portion (4) close to the first water outlet (1-2); the second water outlet (4-1) of the first filter portion (4) is embedded in the first water outlet (1-2) of the main body (1); and a sealing ring (4-2) is provided on the outer side wall of the second water outlet (4-1) of the first filter portion (4) for sealing with the inner side wall of the first water outlet (1-2) of the main body (1); and / or the length of the opening (2-7) is greater than or equal to the length of the first filter portion (4), and the diameter of the cavity (1-1) of the main body (1) is greater than or equal to the diameter of the outer wall of the first filter portion (4); and / or the first filter part (4) is a carbon rod filter element, or a tea bag filter element with carbon powder or mineralized balls inside, or an ultrafiltration membrane filter element, or a filter element with heavy metal adsorption function, or a PP cotton filter element, or a folded filter element, or a filter element with resin, granular carbon, powdered carbon, or carbon fiber inside; Or the first filter part (4) is an RO reverse osmosis filter element or a nanofiltration filter element, a water seal (4-7) is provided between the first filter part (4) and the inner wall of the cavity (1-1) of the main body (1), and a wastewater outlet (2-8) is provided at one end of the main body (1) where the first water outlet (1-2) is located.

6. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 2, characterized in that: The body (1) between the first water outlet (1-2) and the partition plate (1-3) is divided into a first part (2) and a second part (3) which are detachably connected.

7. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 6, characterized in that: The first part (2) and the second part (3) are connected by a screw-on method or a snap-on method; the inner side wall of one end of the first part (2) connected to the second part (3) is provided with a circle of second snap-on grooves (2-2); the end of the second part (3) connected to the first part (2) is provided with an outwardly extending embedded part (3-2); the outer side wall of the embedded part (3-2) is provided with a second snap-on part (3-2-1) that forms a snap-on connection with the second snap-on groove (2-2); And / or one end where the first part (2) is connected to the second part (3) has more than two first protrusions (2-3), and one end where the second part (3) is connected to the first part (2) is provided with a concave first step portion (3-3) matching the first protrusion (2-3).

8. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 7, characterized in that: The embedding portion (3-2) is in the shape of a hollow tube, and the outer side wall of the embedding portion (3-2) is provided with a circle of second buckle portions (3-2-1); And / or a third clamping groove is provided on the inner side wall of the first protruding portion (2-3), and a third clamping portion matching the third clamping groove is provided on the outer side wall of the first step portion (3-3).

9. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 8, characterized in that: The diameter of the outer wall of the embedded portion (3-2) is smaller than the diameter of the outer wall of the second portion (3); the interior of the embedded portion (3-2) is connected to the cavity (1-1) of the first portion (2) and the cavity (1-1) of the second portion (3); the diameter of the inner wall of the embedded portion (3-2) is equal to the diameter of the cavity (1-1) of the first portion (2) and the diameter of the cavity (1-1) of the second portion (3); the diameter of the outer wall of the first portion (2) is equal to the diameter of the outer wall of the second portion (3); the length of the cavity (1-1) of the main body (1) is greater than or equal to the length of the first filter portion (4); and / or the first filter part (4) is a carbon rod filter element, or a tea bag filter element with carbon powder or mineralized balls inside, or an ultrafiltration membrane filter element, or a filter element with heavy metal adsorption function, or a PP cotton filter element, or a folded filter element, or a filter element with resin, granular carbon, powdered carbon, or carbon fiber inside; Or the first filter part (4) is composed of an RO reverse osmosis filter element or a nanofiltration filter element, a water seal (4-7) is provided between the first filter part (4) and the inner wall of the cavity (1-1) of the main body (1), and a wastewater discharge outlet (2-8) is provided at one end of the main body (1) where the first water outlet (1-2) is located.

10. The multifunctional composite central tube in a RO membrane or a nanofiltration membrane according to claim 6, 7, 8 or 9, characterized in that: The outer side surface of one end of the first part (2) connected to the second part (3) is provided with a circle of second step portions (2-4), and the outer side surface of one end of the second part (3) connected to the first part (2) is provided with a circle of third step portions (3-4). When the first part (2) is connected to the second part (3), the second step portions (2-4) and the third step portions (3-4) together form a mounting groove for arranging the second filter part (5).

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