Replaceable filter element assembly, composite filter element and water purification equipment

Abstract

The utility model discloses a replaceable filter element assembly, a composite filter element and water purification equipment, and relates to the technical field of water purification, the replaceable filter element assembly comprises a shell, a separator, a front filter element and a rear filter element; the shell is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet; the partition piece is arranged on the shell and comprises a middle partition plate and a central pipe, the middle partition plate is in sealed connection with the shell, and the middle partition plate and the shell form a first containing cavity and a second containing cavity which are isolated from each other; the front filter element and the rear filter element are respectively placed in the first accommodating cavity and the second accommodating cavity; wherein the first water inlet and the first water outlet are both communicated with the first containing cavity, a pure water flow channel is formed in the center pipe, one end of the pure water flow channel is communicated with the second water inlet through the second containing cavity, and the other end of the pure water flow channel is communicated with the second water outlet. According to the replaceable filter element assembly disclosed by the utility model, the technical problems that a central pipe in the replaceable filter element assembly is complicated in mounting process and relatively low in efficiency can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, in particular to a replaceable filter element component, a composite filter element and water purification equipment. Background Art

[0002] In the related art, the integrated composite filter element of the water purification equipment includes two parts: a filter element body and a replaceable filter element assembly, wherein the filter element body is integrated with a reverse osmosis filter element, and the replaceable filter element assembly is integrated with a pre-filter element and a post-filter element. The replaceable filter element assembly is detachable relative to the filter element body for easy replacement. In the replaceable filter element assembly, it is usually necessary to set a central tube in the filter cavity of the pre-filter element, and the water outlet of the post-filter element and the filter cavity of the post-filter element are connected through the central tube, so that the pure water filtered by the post-filter element can flow out through the water outlet. However, the existing central tube is usually set as a separate tube, which needs to be installed separately during installation, and after installation, its ends need to be fixed and welded, which makes the installation process complicated and inefficient. Utility Model Content

[0003] The main purpose of the utility model is to provide a replaceable filter element assembly, a composite filter element and a water purification device, aiming to solve the technical problems of complex installation process and low efficiency of the central tube in the replaceable filter element assembly.

[0004] To achieve the above-mentioned objectives, the utility model proposes a replaceable filter element assembly, which includes a shell, a partition, a pre-filter element and a post-filter element; the shell is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet; the partition is arranged on the shell, the partition includes a middle partition and a center tube, the middle partition is connected to the outer wall of the center tube, and the middle partition is sealed to the shell; the partition and the shell form a first cavity and a second cavity that are isolated from each other; the pre-filter element is arranged in the first cavity and is sleeved with the center tube; the post-filter element is arranged in the second cavity and is sleeved with the center tube; wherein, the first water inlet and the first water outlet are both connected to the first cavity, and the center tube forms a pure water flow channel, one end of the pure water flow channel is connected to the second water inlet through the second cavity, and the other end is connected to the second water outlet.

[0005] In one embodiment, the first water inlet, the first water outlet, and the second water outlet are arranged on one side of the length direction of the shell, and the second water inlet is arranged on the other side of the length direction of the shell.

[0006] In one embodiment, the middle partition is provided with a sealing groove, a sealing member is provided in the sealing groove, and the middle partition and the shell are sealed and connected via the sealing member.

[0007] In one embodiment, a first mounting groove is provided on the side of the middle partition facing the first cavity, and the replaceable filter element assembly also includes an upper end cover, the upper end cover is provided with an upper card slot, and the two ends of the pre-filter element are respectively arranged in the first mounting groove and the upper card slot.

[0008] In one embodiment, the water inlet side of the pre-filter element is connected to the first water inlet, the water outlet side of the pre-filter element is connected to the first water outlet, and both ends of the pre-filter element are glued to the first installation groove and the upper clamping groove respectively.

[0009] In one embodiment, a second mounting groove is provided on the side of the middle partition facing the second cavity, and the replaceable filter element assembly also includes a lower end cover, and the lower end cover is provided with a lower card slot, and the two ends of the post-filter element are respectively arranged in the second mounting groove and the lower card slot.

[0010] In one embodiment, the water inlet side of the post filter element is connected to the second water inlet, the water outlet side of the post filter element is connected to the pure water flow channel, and both ends of the post filter element are glued to the second mounting groove and the lower card groove respectively.

[0011] In one embodiment, a water outlet is provided at the end of the central tube close to the second water inlet, and the water outlet side of the post-filter element is connected to the pure water flow channel through the water outlet.

[0012] In one embodiment, the lower end cover is provided with a raised portion, the central tube is sleeved with the raised portion, and a gap is provided between the raised portion and the central tube.

[0013] In one embodiment, in the axial direction of the central pipe, the height of the protrusion is higher than the height of the water outlet.

[0014] In one embodiment, the central tube includes a first tube portion and a second tube portion located on opposite sides of the middle partition, the front filter element is sleeved on the first tube portion, and the rear filter element is sleeved on the second tube portion, and the wall thickness of the first tube portion is not less than the wall thickness of the second tube portion.

[0015] In one embodiment, the wall thickness of the first tube portion is in the range of 1.5 mm to 4 mm, and / or the wall thickness of the second tube portion is in the range of 1.5 mm to 3 mm.

[0016] In one embodiment, the thickness of the middle diaphragm is greater than the thickness of the first tube portion, and / or the thickness of the middle diaphragm is in the range of 3 mm to 7 mm.

[0017] The present invention also proposes a composite filter element, which includes the replaceable filter element assembly and the reverse osmosis filter element; the reverse osmosis filter element includes a filter bottle, a separation cylinder and a reverse osmosis filter element, the separation cylinder is arranged on the filter bottle and forms a first filter chamber and a second filter chamber that are isolated from each other, the reverse osmosis filter element is sleeved with the separation cylinder and arranged in the first filter chamber, and the separation cylinder forms the second filter chamber; the replaceable filter element assembly is detachably arranged in the second filter chamber; wherein the separation cylinder is provided with a waterway connection port, and the second water inlet of the replaceable filter element assembly is plugged into the waterway connection port; the replaceable filter element assembly includes a shell, a partition, a pre-filter element and a post-filter element; the shell is provided with a first inlet water inlet, a first water outlet, a second water inlet and a second water outlet; the partition is arranged on the shell, the partition includes a middle partition and a central tube, the middle partition is connected to the outer wall of the central tube, and the middle partition is sealed with the shell; the partition and the shell form a first cavity and a second cavity that are isolated from each other; the pre-filter element is arranged in the first cavity and is sleeved with the central tube; the post-filter element is arranged in the second cavity and is sleeved with the central tube; wherein, the first water inlet and the first water outlet are both connected with the first cavity, the central tube forms a pure water flow channel, one end of the pure water flow channel is connected with the second water inlet through the second cavity, and the other end is connected with the second water outlet.

[0018] The present invention also proposes a water purification device, which includes a composite filter element, and the composite filter element includes the replaceable filter element assembly and a reverse osmosis filter element; the reverse osmosis filter element includes a filter bottle, a separation cylinder and a reverse osmosis filter element, the separation cylinder is arranged on the filter bottle and forms a first filter chamber and a second filter chamber that are isolated from each other, the reverse osmosis filter element is sleeved with the separation cylinder and arranged in the first filter chamber, and the separation cylinder forms the second filter chamber; the replaceable filter element assembly is detachably arranged in the second filter chamber; wherein the separation cylinder is provided with a waterway connection port, and the second water inlet of the replaceable filter element assembly is plugged into the waterway connection port; the replaceable filter element assembly includes a shell, a partition, a pre-filter element and a post-filter element; the The shell is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet; the partition is arranged on the shell, and the partition includes a middle partition and a central tube, the middle partition is connected to the outer wall of the central tube, and the middle partition is sealed with the shell; the partition and the shell form a first cavity and a second cavity that are isolated from each other; the pre-filter element is arranged in the first cavity and is sleeved with the central tube; the post-filter element is arranged in the second cavity and is sleeved with the central tube; wherein, the first water inlet and the first water outlet are both connected with the first cavity, and the central tube forms a pure water flow channel, one end of the pure water flow channel is connected with the second water inlet through the second cavity, and the other end is connected with the second water outlet.

[0019] The technical solution of the present utility model is that the replaceable filter element assembly includes a separator, and the separator includes a middle partition and a central tube, the middle partition is connected to the outer wall of the central tube, and the middle partition is sealed with the shell. The internal chamber of the shell is divided into a first cavity and a second cavity that are isolated from each other by using the middle partition of the separator, and the first cavity is provided with a pre-filter element, and the second cavity is provided with a post-filter element, and the first water inlet and the first water outlet are both connected to the first cavity, and the central tube forms a pure water flow channel, one end of the pure water flow channel is connected to the second water inlet through the second cavity, and the other end is connected to the second water outlet. In this way, the middle partition and the central tube in the separator not only realize the mutual isolation of the first cavity and the second cavity, but also realize the connection between the second water inlet and the second water outlet through the pure water flow channel in the central tube. The central tube is installed into the shell as a whole along with the separator, and there is no need to weld its ends to fix it, etc. The installation process is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a structural diagram of an embodiment of a composite filter element provided by the present utility model;

[0022] Figure 2 for Figure 1 Exploded view of the medium composite filter element;

[0023] Figure 3 This is a structural schematic diagram of an embodiment of a replaceable filter element assembly provided by the present utility model;

[0024] Figure 4 for Figure 3 A cross-sectional view of a replaceable filter element assembly;

[0025] Figure 5 for Figure 4 A partial enlarged view of point A in the middle;

[0026] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0027] Figure 7 A schematic structural diagram of an embodiment of a separator provided by the present utility model;

[0028] Figure 8 for Figure 7 a cross-sectional view of the middle separator;

[0029] Figure 9 for Figure 2 Cross-sectional view of the composite filter element in exploded state.

[0030] Description of Figure Numbers:

[0031] 1. Composite filter element;

[0032] 20. Reverse osmosis filter assembly; 21. Filter bottle; 21a. First filter chamber; 21b. Second filter chamber; 22. Separator cylinder; 22a. Waterway connection port; 23. Reverse osmosis filter element;

[0033] 10. Replaceable filter element assembly;

[0034] 100, housing; 110, first water inlet; 120, first water outlet; 130, second water inlet; 140, second water outlet;

[0035] 200, separator; 210, middle partition; 211, first mounting groove; 212, second mounting groove; 213, sealing groove; 220, center tube; 220a, pure water flow channel; 221, first tube portion; 222, second tube portion; 223, water outlet;

[0036] 310, first chamber; 320, second chamber; 410, pre-filter element; 420, post-filter element;

[0037] 510, upper end cover; 511, upper slot; 520, lower end cover; 521, lower slot; 522, raised portion;

[0038] 600. Seals.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 shall fall within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] In the related art, the integrated composite filter element of the water purification equipment includes two parts: a filter element body and a replaceable filter element assembly, wherein the filter element body is integrated with a reverse osmosis filter element, and the replaceable filter element assembly is integrated with a pre-filter element and a post-filter element. The replaceable filter element assembly is detachable relative to the filter element body for easy replacement. In the replaceable filter element assembly, it is usually necessary to set a central tube in the filter cavity of the pre-filter element, and the water outlet of the post-filter element and the filter cavity of the post-filter element are connected through the central tube, so that the pure water filtered by the post-filter element can flow out through the water outlet. However, the existing central tube is usually set as a separate tube, which needs to be installed separately during installation, and after installation, its ends need to be fixed and welded, which makes the installation process complicated and inefficient.

[0044] The utility model provides a replaceable filter element assembly, which is used for detachably connecting with a filter bottle of a composite filter element and is used as a whole in a water purification device, wherein the water purification device is a water purifier, a water dispenser or a pure water machine.

[0045] See also Figures 3 to 6 In one embodiment of the present invention, the replaceable filter element assembly 10 includes a housing 100, a separator 200, a pre-filter element 410 and a post-filter element 420; the housing 100 is provided with a first water inlet 110, a first water outlet 120, a second water inlet 130 and a second water outlet 140; the separator 200 is arranged on the housing 100, and the separator 200 includes a middle partition 210 and a central tube 220, the middle partition 210 is connected to the outer wall of the central tube 220, and the middle partition 210 is sealed with the housing 100; the separator 200 and The shell 100 forms a first cavity 310 and a second cavity 320 that are isolated from each other; the pre-filter element 410 is arranged in the first cavity 310 and is covered with a central tube 220; the post-filter element 420 is arranged in the second cavity 320 and is covered with a central tube 220; wherein, the first water inlet 110 and the first water outlet 120 are both connected to the first cavity 310, and the central tube 220 forms a pure water flow channel 220a, one end of the pure water flow channel 220a is connected to the second water inlet 130 through the second cavity 320, and the other end is connected to the second water outlet 140.

[0046] Specifically, the housing 100 is the housing 100 of the replaceable filter element assembly 10, and the water paths of the pre-filter element 410 and the post-filter element 420 are both located in the housing 100. The pre-filter element 410 and the post-filter element 420 are both hollow cylindrical structures, so the shape of the housing 100 is adapted to the shapes of the pre-filter element 410 and the post-filter element 420. The partition 200 is arranged in the shell 100, and divides the chamber in the shell 100 into an isolated first chamber 310 and a second chamber 320. The pre-filter element 410 is arranged in the first chamber 310, and the post-filter element 420 is arranged in the second chamber 320. The first water inlet 110 and the first water outlet 120 are both connected to the first chamber 310, and the second water inlet 130 and the second water outlet 140 are both connected to the second chamber 320. That is to say, water flowing into the first chamber 310 from the first water inlet 110 is filtered by the pre-filter element 410 and then flows out from the first water outlet 120. Water flowing into the second chamber 320 from the second water inlet 130 is filtered by the post-filter element 420 and then flows out from the second water outlet 140.

[0047] The pre-filter element 410 refers to the filter element in the water system that gives priority to filtering water. The post-filter element 420 is located downstream of the pre-filter element 410 in the water system. It can directly filter the water after being filtered by the pre-filter element 410, or it can filter the water that has been filtered by the pre-filter element 410 and then filtered by other filter elements (such as reverse osmosis filter element 23). Specifically, the pre-filter element 410 can filter large particles of impurities in the water, effectively remove large particles of impurities such as mud, rust, insect eggs, and suspended matter in the water, and ensure that the water quality entering the home is initially purified. If these impurities directly enter household water pipes, faucets, washing machines, water heaters and other equipment, they are likely to cause blockage and wear. The use of the pre-filter element 410 can effectively protect these devices from damage. Through the preliminary filtration of the pre-filter element 410, the filtering burden of subsequent water purification equipment (such as water purifiers, pure water machines, etc.) can be greatly reduced, thereby extending the service life of these equipment. Due to the presence of the pre-filter 410, the frequency of filter replacement in subsequent water purification equipment will also be reduced accordingly, thereby reducing the costs incurred by frequent filter replacement. In addition, the pre-filter 410 can also improve water quality. The impurity content of the water filtered by the pre-filter 410 is greatly reduced, and the water quality is significantly improved. This not only makes daily water use such as washing and laundry more comfortable and healthy, but also provides a better foundation for subsequent water treatment processes. At the same time, the pre-filter 410 can reduce the turbidity in the water and reduce the possibility of bacterial growth, thereby effectively reducing secondary pollution in water pipes, water tanks and other places. Some pre-filters 410 also have scale inhibition functions. For example, the use of scale inhibition filters containing hydrochloric acid and phosphorus can reduce the formation of scale inside equipment such as solar equipment and water boilers.

[0048] Post-filter 420 further purifies the water and removes residual impurities. Specifically, post-filter 420 removes any remaining impurities, odors, and discoloration that may remain in the water after treatment by pre-filter 410 and the primary filter (e.g., an RO reverse osmosis membrane). These impurities may include tiny suspended solids and organic compounds. Post-filter 420, particularly the activated carbon filter, effectively absorbs odors and residual chlorine in the water, making the treated water taste fresher and sweeter. This is particularly important for improving the quality of drinking water. In some cases, water treated by an RO reverse osmosis membrane may exhibit a certain alkalinity. Certain components (e.g., minerals) in post-filter 420 can help adjust the water's pH to a more neutral or potable pH. Some post-filters 420 are also designed to increase the amount of minerals in the water to meet the needs of specific populations for mineral water. Furthermore, the further purification provided by post-filter 420 reduces impurities and substances in the water that could be harmful to downstream equipment (e.g., water dispensers and electric kettles), thereby extending the lifespan of these devices. Due to the presence of the post-filter element 420, the frequency of subsequent cleaning and maintenance of the equipment will be reduced accordingly, thereby reducing the costs caused by equipment failure or maintenance.

[0049] See also Figure 4 and Figure 7 It should be noted that the separator 200 includes a middle partition plate 210 and a central tube 220. The central tube 220 is configured as a hollow tube with a certain length, and a pure water flow channel 220a is formed inside it. Through the setting of the pure water flow channel 220a in the central tube 220, the second water inlet 130 and the second water inlet 130 can be connected and isolated from the first cavity 310, without affecting the water flow of the pre-filter element 410.

[0050] Specifically, the middle partition 210 is arranged in a plate shape, and the outer wall surface of the middle partition 210 and the central tube 220 are connected together. The connection relationship between the central tube 220 and the middle partition 210 can be connected together by hot melt welding, clamping or other connection methods. In this embodiment, the central tube 220 and the middle partition 210 are integrally formed. The integral forming avoids the welding or connection between components in traditional manufacturing, thereby eliminating seams and potential weaknesses. This helps to improve the strength and durability of the overall structure, because seams are often the most vulnerable places for components to be damaged. Through integral forming, the material maintains continuity inside the component, which helps to better transfer and disperse stress, thereby improving the overall fatigue resistance and fracture resistance. In addition, integral forming can usually be completed in a single processing process, reducing the need for multiple processes (such as cutting, welding, grinding, etc.) in traditional manufacturing. This not only saves time and improves production efficiency, but also reduces production costs. Integral forming technology is often combined with automated production equipment to further improve production efficiency and consistency. Furthermore, through precise molds and processing equipment, one-piece molding ensures the accuracy of component size and shape, improving the overall appearance quality of the product. One-piece molding also offers significant advantages in reducing costs. On the one hand, it reduces material waste caused by cutting and scrapping, lowering raw material costs. On the other hand, by reducing the number of steps and increasing the degree of automation, one-piece molding also reduces reliance on manual labor and labor costs.

[0051] See also Figure 4 The middle diaphragm 210 is sealedly connected to the housing 100, which means that the middle diaphragm 210 is in sealed contact with the inner wall of the housing 100 to separate the chamber within the housing 100 into a first cavity 310 and a second cavity 320 that are isolated from each other. The first cavity 310 and the second cavity 320 are arranged in the longitudinal direction of the housing 100. The longitudinal direction of the housing 100 can be defined as the vertical direction, that is, the pre-filter element 410 and the post-filter element 420 are arranged in the vertical direction. The volume of the pre-filter element 410 is larger than that of the post-filter element 420, and the length of the pre-filter element 410 is longer than that of the post-filter element 420, so as to ensure the filtering effect of the pre-filter element 410 and the post-filter element 420. Since the pre-filter element 410 is used to filter out most of the impurities in the raw water, the overall volume of the pre-filter element 410 needs to be set larger, and the water passing through the post-filter element 420 has been filtered twice by the pre-filter element 410 and the reverse osmosis filter element 23, and the solute content in the water is already very small, so the overall volume of the post-filter element 420 can be set relatively smaller. Therefore, arranging the pre-filter element 410 and the post-filter element 420 in the up and down direction can ensure the filtering effect of the pre-filter element 410 and the post-filter element 420.

[0052] The technical solution of the present invention is that the replaceable filter element assembly 10 includes a separator 200, which includes a middle partition 210 and a central tube 220. The middle partition 210 is connected to the outer wall of the central tube 220 and is sealed to the housing 100. The middle partition 210 of the separator 200 is used to divide the internal chamber of the housing 100 into a first cavity 310 and a second cavity 320, respectively. The first cavity 310 is provided with a pre-filter element 410, and the second cavity 320 is provided with a post-filter element 420. In addition, the first water inlet 110 and the first water outlet 120 are both connected to the first cavity 310. The central tube 220 is formed with a pure water flow channel 220a. One end of the pure water flow channel 220a is connected to the second water inlet 130 through the second cavity 320, and the other end is connected to the second water outlet 140. With such arrangement, not only the mutual isolation of the first cavity 310 and the second cavity 320 is achieved through the middle partition 210 and the central tube 220 in the partition 200, but also the connection between the second water inlet 130 and the second water outlet 140 is achieved through the pure water flow channel 220a in the central tube 220. The central tube 220 is installed into the shell 100 as a whole along with the partition 200, and there is no need to weld its ends to fix them, etc. The installation process is simple and efficient.

[0053] See also Figures 4 to 8In one embodiment, the central tube 220 includes a first tube portion 221 and a second tube portion 222 located on opposite sides of the middle partition 210. The pre-filter element 410 is sleeved with the first tube portion 221, and the post-filter element 420 is sleeved with the second tube portion 222. The wall thickness of the first tube portion 221 is not less than the wall thickness of the second tube portion 222. Specifically, the first tube portion 221 and the second tube portion 222 are arranged on opposite sides of the middle partition 210. Since it is necessary to ensure the isolation of the first cavity 310 and the second cavity 320, the pre-filter element 410 is sleeved with the first tube portion 221. The first tube portion 221 and the second tube portion 222 are coaxially arranged and communicate with the internal pure water flow channel 220a. The end of the first tube portion 221 away from the middle partition 210 is directly and sealedly connected to the second water outlet 140 to ensure that the pure water flow channel 220a connected to the water outlet side of the post-filter element 420 is isolated from the water outlet side of the pre-filter element 410. Similarly, the post-filter element 420 is sleeved with the second tube portion 222. The arrangement of the first tube portion 221 and the second tube portion 222 both provide a certain degree of support for the pre-filter element 410 and the post-filter element 420, preventing the pre-filter element 410 and the post-filter element 420 from deforming during use. Since the first tube portion 221 and the second tube portion 222 are subject to the force of the pressure difference within the housing 100, the wall thickness of the first tube portion 221 is not less than the wall thickness of the second tube portion 222. Preferably, the wall thickness of the first tube portion 221 is set to be greater than the wall thickness of the second tube portion 222. On the one hand, this can provide better support for the longer pre-filter element 410. On the other hand, the thicker first tube portion 221 can prevent the pressure imbalance between the inside and outside of the first tube portion 221, which may cause the first tube portion 221 to be crushed or damaged.

[0054] See also Figure 8 In one embodiment, the wall thickness of the first tube portion 221 ranges from 1.5 mm to 4 mm, and / or the wall thickness of the second tube portion 222 ranges from 1.5 mm to 3 mm. Specifically, in this embodiment, the wall thickness of the first tube portion 221 may be greater than or equal to 1.5 mm and less than or equal to 4 mm, or the wall thickness of the second tube portion 222 may be greater than or equal to 1.5 mm and less than or equal to 3 mm. Alternatively, the wall thickness of the first tube portion 221 may be greater than or equal to 1.5 mm and less than or equal to 4 mm, and the wall thickness of the second tube portion 222 may be greater than or equal to 1.5 mm and less than or equal to 3 mm. It should be noted that the wall thickness of the first tube portion 221 should always be no less than the wall thickness of the second tube portion 222. The wall thickness of the first tube portion 221 is exemplarily 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, and 4 mm, and the wall thickness of the second tube portion 222 is exemplarily 1.5 mm, 2 mm, 2.5 mm, and 3 mm. Considering the tolerances of the center tube 220 during actual production, the wall thicknesses of the first tube portion 221 and the second tube portion 222 are approximate values ​​with a tolerance within ±0.2 mm.

[0055] See also Figure 8 In one embodiment, the thickness of the middle diaphragm 210 is greater than the thickness of the first tube portion 221, and / or the thickness of the middle diaphragm 210 is greater than or equal to 3 mm and less than or equal to 7 mm. Specifically, due to the large pressure difference between the first cavity 310 and the second cavity 320, the pressure in the two cavities will be concentrated on the middle diaphragm 210. Therefore, the thickness of the middle diaphragm 210 needs to be set thicker. At the same time, setting the thickness of the middle diaphragm 210 thicker also facilitates the formation of a sealing groove 213 on the outer periphery of the middle diaphragm 210 and the installation of a sealing member 600 to achieve a seal with the housing 100. Regarding the thickness of the middle diaphragm 210, first, the thickness of the middle diaphragm 210 can be set to be greater than the thickness of the first tube portion 221. Second, the thickness of the middle diaphragm 210 can be limited to between 3 mm and 7 mm. Exemplary thicknesses of the middle diaphragm 210 include 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, and 7 mm. Considering the tolerances of the center tube 220 during actual production, the thickness of the middle diaphragm 210 is an approximate value with a tolerance of ±0.2 mm. Third, while ensuring that the thickness of the middle diaphragm 210 is greater than that of the first tube portion 221, the thickness range can be limited to between 3 mm and 7 mm.

[0056] See also Figure 5 、 Figure 6 and Figure 8 In one embodiment, a first mounting groove 211 is provided on the side of the middle partition 210 facing the first cavity 310. The replaceable filter element assembly 10 further includes an upper end cap 510 having an upper retaining groove 511. The two ends of the pre-filter element 410 are respectively disposed in the first mounting groove 211 and the upper retaining groove 511. Specifically, to secure the pre-filter element 410, a first mounting groove 211 is provided on the side of the middle partition 210 facing the first cavity 310. One end of the pre-filter element 410 is placed in the first mounting groove 211. The other end of the pre-filter element 410 is connected and secured to the upper end cap 510, which is also provided with an upper retaining groove 511. The upper retaining groove 511 secures the other end of the pre-filter element 410. In this way, by securing the two ends of the pre-filter element 410, the entire pre-filter element 410 is secured and secured, preventing it from moving or being damaged during use. The first installation groove 211 is formed between a peripheral edge protruding from the middle partition plate 210 toward the first cavity 310 and an outer wall surface of the first tube body.

[0057] Furthermore, the water inlet side of the pre-filter element 410 is connected to the first water inlet 110, the water outlet side of the pre-filter element 410 is connected to the first water outlet 120, and the two ends of the pre-filter element 410 are respectively glued to the first mounting groove 211 and the upper clamping groove 511, so as to prevent the pre-filter element 410 from being deformed and dislocated by the impact of water pressure, thereby further extending the service life of the pre-filter element 410.

[0058] Please continue reading Figure 5 、 Figure 6 and Figure 8 In one embodiment, a second mounting groove 212 is provided on the side of the middle partition 210 facing the second cavity 320. The replaceable filter element assembly 10 further includes a lower end cap 520 having a lower retaining groove 521. The two ends of the post-filter element 420 are respectively disposed in the second mounting groove 212 and the lower retaining groove 521. Specifically, to secure the post-filter element 420, a second mounting groove 212 is provided on the side of the middle partition 210 facing the second cavity 320. One end of the post-filter element 420 is placed in the second mounting groove 212. The other end of the post-filter element 420 is connected and secured to the lower end cap 520 having a lower retaining groove 521. By securing the two ends of the post-filter element 420, the entire post-filter element 420 is secured and secured, preventing it from moving or being damaged during use. The second mounting groove 212 is formed between a peripheral edge protruding from the middle partition plate 210 toward the second cavity 320 and an outer wall surface of the second tube body.

[0059] Furthermore, the water inlet side of the rear filter element 420 is connected to the second water inlet 130, the water outlet side of the rear filter element 420 is connected to the pure water flow channel 220a, and the two ends of the rear filter element 420 are respectively glued to the second mounting groove 212 and the lower card groove 521, so as to prevent the rear filter element 420 from being deformed and dislocated by the impact of water pressure, thereby further extending the service life of the rear filter element 420.

[0060] See also Figures 6 to 8In one embodiment, a water outlet 223 is defined at the end of the central tube 220 near the second water inlet 130. The outlet side of the post-filter element 420 communicates with the pure water flow channel 220a through the water outlet 223. Specifically, the outlet side of the post-filter element 420 communicates with the pure water flow channel 220a through the water outlet 223. The water outlet 223 is a notch defined at the end of the central tube 220 to facilitate water flow. Multiple water outlets 223 may be provided, spaced apart along the circumference of the central tube 220. Since the water outlet 223 is opened at the end of the central tube 220 close to the second water inlet 130, the tube wall portion of the central tube 220 guides the water flow in the second cavity 320 and supports the post-filter element 420. The tube wall portion of the central tube 220 guides the pure water filtered by the post-filter element 420 to the water outlet 223. The water flow path in the second cavity 320 is reasonable and can maintain a relative balance with the water flow in the first cavity 310 in the force acting on the central partition 210.

[0061] See also Figure 6 In one embodiment, the lower end cap 520 is provided with a raised portion 522, and the central tube 220 is sleeved with the raised portion 522, with a gap between the raised portion 522 and the central tube 220. Specifically, the raised portion 522 is sleeved on the end of the central tube 220, and the raised portion 522 can play a certain limiting role on the end of the central tube 220, preventing the central tube 220 from moving when subjected to the impact force of the water flow due to the lack of a limit structure at the end of the central tube 220. At the same time, there is a gap between the raised portion 522 and the central tube 220, which is used to allow the pure water filtered by the post-filter element 420 to flow through. The pure water flowing out of the water outlet side of the post-filter element 420 will flow through the water outlet 223, the gap between the raised portion 522 and the central tube 220, and into the pure water flow channel 220a, and finally flow out from the second water outlet 140 for use by the user.

[0062] See also Figure 6 In one embodiment, the height of the raised portion 522 is higher than the height of the water outlet 223 in the axial direction of the central tube 220. This arrangement further ensures the stability of the restraining relationship between the central tube 220 and the raised portion 522, preventing the central tube 220 from easily falling out of the raised portion 522. It also prevents the purified water passing through the water outlet 223 from flowing directly into the purified water flow channel 220a through the water outlet 223, thereby affecting the balance of forces generated by the water flow within the second chamber 320.

[0063] See also Figures 6 to 8In one embodiment, the middle diaphragm 210 is provided with a sealing groove 213, in which a sealing member 600 is disposed. The middle diaphragm 210 and the housing 100 are sealed together via the sealing member 600. In other words, to ensure the effectiveness and tightness of the sealing connection between the middle diaphragm 210 and the housing 100, a sealing groove 213 is further formed on the surface of the middle diaphragm 210 that mates with the inner wall of the housing 100. The sealing member 600 is disposed in the sealing groove 213, thereby ensuring a sealed connection between the middle diaphragm 210 and the housing 100. The sealing member 600 is a sealing ring. As for the type of sealing ring, there is no specific limitation. It only needs to ensure a relative seal between the housing 100 and the middle diaphragm 210.

[0064] See also Figure 3 In one embodiment, the first water inlet 110, the first water outlet 120, and the second water outlet 140 are arranged on one side of the length direction of the housing 100, and the second water inlet 130 is arranged on the other side of the length direction of the housing 100. The main consideration here is that when the replaceable filter element assembly 10 is detachably connected to the composite filter element 1, the second water inlet 130 connected to the water inlet side of the post-filter element 420 is mainly used to connect to the pure water outlet after filtering by the reverse osmosis filter assembly 20. Therefore, the second water inlet 130 is arranged on one side of the length direction of the housing 100, and the housing 100 part needs to be inserted into the composite filter element 1 to achieve docking and connection between the second water inlet 130 and the aforementioned pure water outlet. The first water inlet 110, the first water outlet 120, and the second water outlet 140 are used to connect to the external waterway plate. Therefore, the first water inlet 110, the first water outlet 120, and the second water outlet 140 are arranged on the side of the housing 100 away from the second water inlet 130.

[0065] See also Figure 1 、 Figure 2 and Figure 9The present invention also proposes a composite filter element 1, which includes the aforementioned replaceable filter element assembly 10 and a reverse osmosis filter assembly 20. The reverse osmosis filter assembly 20 includes a filter bottle 21, a separator cylinder 22, and a reverse osmosis filter element 23. The separator cylinder 22 is disposed on the filter bottle 21 and forms a first filter chamber 21a and a second filter chamber 21b that are isolated from each other. The reverse osmosis filter element 23 is sleeved on the separator cylinder 22 and disposed in the first filter chamber 21a, and the separator cylinder 22 forms the second filter chamber 21b. The replaceable filter element assembly 10 is detachably disposed in the second filter chamber 21b. The separator cylinder 22 is provided with a waterway connection port 22a, and the second water inlet 130 of the replaceable filter element assembly 10 is plugged into the waterway connection port 22a. The specific structure of the replaceable filter element assembly 10 refers to the above-mentioned embodiment. Since the present composite filter element 1 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here. The water purification device is a water purifier, a water dispenser or a pure water machine. The replaceable filter element assembly 10 includes a housing 100, a separator 200, a pre-filter element 410 and a post-filter element 420; the housing 100 is provided with a first water inlet 110, a first water outlet 120, a second water inlet 130 and a second water outlet 140; the separator 200 is provided on the housing 100, and the separator 200 includes a middle partition 210 and a central tube 220, the middle partition 210 is connected to the outer wall of the central tube 220, and the middle partition 210 is sealed to the housing 100; the separator 200 and the housing 100 are in a closed shape. The first cavity 310 and the second cavity 320 are isolated from each other; the pre-filter element 410 is arranged in the first cavity 310 and is covered with a central tube 220; the post-filter element 420 is arranged in the second cavity 320 and is covered with a central tube 220; wherein the first water inlet 110 and the first water outlet 120 are both connected to the first cavity 310, and the central tube 220 forms a pure water flow channel 220a, one end of the pure water flow channel 220a is connected to the second water inlet 130 through the second cavity 320, and the other end is connected to the second water outlet 140.

[0066] The present invention further provides a water purification device, comprising a composite filter element 1, which includes a replaceable filter element assembly 10. The specific structure of the replaceable filter element assembly 10 is similar to the above-described embodiments. Since the present water purification device utilizes all the technical solutions of all the above-described embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above-described embodiments, which will not be detailed here.

[0067] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A replaceable filter element assembly, characterized in that: include: The shell is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet; a separator disposed on the shell, the separator comprising a middle diaphragm and a central tube, the middle diaphragm being connected to the outer wall of the central tube and being sealed to the shell; the separator and the shell forming a first cavity and a second cavity that are isolated from each other; A pre-filter element is disposed in the first cavity and sleeved with the central tube; as well as A post-filter element is disposed in the second cavity and sleeved with the central tube; The first water inlet and the first water outlet are both connected to the first cavity, the central tube forms a pure water flow channel, one end of the pure water flow channel is connected to the second water inlet through the second cavity, and the other end is connected to the second water outlet.

2. The replaceable filter element assembly according to claim 1, wherein: The first water inlet, the first water outlet and the second water outlet are arranged on one side of the length direction of the shell, and the second water inlet is arranged on the other side of the length direction of the shell.

3. The replaceable filter element assembly according to claim 2, wherein: The middle diaphragm is provided with a sealing groove, a sealing member is provided in the sealing groove, and the middle diaphragm and the shell are sealed and connected via the sealing member.

4. The replaceable filter element assembly according to claim 1, wherein: The middle partition is provided with a first mounting groove on the side facing the first cavity. The replaceable filter element assembly also includes an upper end cover, and the upper end cover is provided with an upper clamping groove. The two ends of the pre-filter element are respectively arranged in the first mounting groove and the upper clamping groove.

5. The replaceable filter element assembly according to claim 4, wherein: The water inlet side of the pre-filter element is connected to the first water inlet, the water outlet side of the pre-filter element is connected to the first water outlet, and both ends of the pre-filter element are glued to the first installation groove and the upper clamping groove respectively.

6. The replaceable filter element assembly according to claim 1, wherein: The middle partition is provided with a second mounting groove on the side facing the second cavity. The replaceable filter element assembly also includes a lower end cover, and the lower end cover is provided with a lower card slot. The two ends of the post-filter element are respectively arranged in the second mounting groove and the lower card slot.

7. The replaceable filter element assembly according to claim 6, wherein: The water inlet side of the post filter element is connected to the second water inlet, the water outlet side of the post filter element is connected to the pure water flow channel, and both ends of the post filter element are glued to the second installation groove and the lower card groove respectively.

8. The replaceable filter element assembly according to claim 6, wherein: A water outlet is provided at the end of the central tube close to the second water inlet, and the water outlet side of the post-filter element is connected to the pure water flow channel through the water outlet.

9. The replaceable filter element assembly according to claim 8, wherein: The lower end cover is provided with a raised portion, the central tube is sleeved with the raised portion, and a gap is provided between the raised portion and the central tube.

10. The replaceable filter element assembly according to claim 9, wherein: In the axial direction of the central pipe, the height of the protrusion is higher than the height of the water outlet.

11. The replaceable filter element assembly according to claim 1, wherein: The central tube includes a first tube portion and a second tube portion located on opposite sides of the middle partition, the front filter element is sleeved on the first tube portion, and the rear filter element is sleeved on the second tube portion, and the wall thickness of the first tube portion is not less than the wall thickness of the second tube portion.

12. The replaceable filter element assembly according to claim 11, wherein: The wall thickness of the first tube portion is in the range of 1.5 mm to 4 mm, and / or the wall thickness of the second tube portion is in the range of 1.5 mm to 3 mm.

13. The replaceable filter element assembly according to claim 11, wherein: The thickness of the middle diaphragm is greater than the thickness of the first tube portion, and / or the thickness of the middle diaphragm is in the range of 3 mm to 7 mm.

14. A composite filter element, characterized in that: include: The replaceable filter element assembly according to any one of claims 1 to 13, and; A reverse osmosis filtration assembly includes a filter bottle, a separation cylinder and a reverse osmosis filter element. The separation cylinder is arranged on the filter bottle and forms a first filter chamber and a second filter chamber that are isolated from each other. The reverse osmosis filter element is sleeved on the separation cylinder and arranged in the first filter chamber, and the separation cylinder forms the second filter chamber. The replaceable filter element assembly is detachably arranged in the second filter chamber. The separation cylinder is provided with a water channel connection port, and the second water inlet of the replaceable filter element assembly is plugged into the water channel connection port.

15. A water purification device, characterized in that: Comprising the composite filter element as claimed in claim 14.

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