Reverse osmosis filtration assembly and water purification apparatus

Abstract

The application discloses a reverse osmosis filtering assembly and a water purification device, wherein the reverse osmosis filtering assembly comprises a filtering bottle, a reverse osmosis filter core, a center pipe, a sealing layer and a first filter core cover; the filtering bottle is provided with a water inlet, a water outlet and a waste water outlet; the sealing layer is used for separating the reverse osmosis filter core and a water passing gap; and the first filter core cover is sealingly connected with the center pipe. According to the technical scheme, the water passing gap and the center pipe are simultaneously arranged as a pure water channel, the pure water channel is sealed from the reverse osmosis filter core, when the gas in the water passing gap is compressed by the pressure of the water pump, more pure water can be filled in the water passing gap, when the water pump is closed, the volume of the gas in the water passing gap is restored, the excess pure water in the water passing gap is squeezed and flows back to the reverse osmosis filter core, part of waste water in the reverse osmosis filter core is discharged, the TDS of the water in the reverse osmosis filter core is improved, and the taste of the first cup of water accessed by the user is improved.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and in particular to a reverse osmosis filtration component and water purification equipment. Background Technology

[0002] As people increasingly prioritize quality of life, water quality has become a major concern. Water purifiers with reverse osmosis capabilities are gaining popularity due to the fresher, more hygienic, and safer purified water they produce. Raw water typically has a high total dissolved solids (TDS). Reverse osmosis filters, aided by a water pump, block a large number of ions in the raw water before reaching the osmosis membrane, ensuring that the TDS of the water passing through the membrane meets drinking water standards. However, if the water purifier is shut down for an extended period and then restarted, the first glass of purified water will have a higher TDS, resulting in lower quality water that does not meet the user's needs. Summary of the Invention

[0003] The main objective of this invention is to provide a reverse osmosis filtration assembly designed to reduce the TDS value of the first cup of water.

[0004] To achieve the above objectives, the present invention provides a reverse osmosis filtration assembly comprising:

[0005] A filter bottle, wherein the filter bottle is provided with an inlet, an outlet and a wastewater outlet;

[0006] The reverse osmosis filter element is installed inside the filter bottle;

[0007] The central tube is fitted with the reverse osmosis filter element, and the central tube has a water passage hole that connects to the reverse osmosis filter element. There is a water passage gap between the reverse osmosis filter element and the filter bottle, and the central tube is connected to the water outlet through the water passage gap.

[0008] A sealing layer is disposed on the outer periphery of the reverse osmosis filter element, the sealing layer being used to separate the reverse osmosis filter element from the water passage gap;

[0009] The first filter element cover is connected to one end of the reverse osmosis filter element, and the first filter element cover is sealed to the central tube.

[0010] Raw water is pressurized by a water pump and flows into the inlet. The gas inside the filter bottle is compressed. When the reverse osmosis filtration assembly stops operating, the compressed gas inside the filter bottle gradually expands and recovers, squeezing the pure water in the central tube and the water passage gap back into the reverse osmosis filter element.

[0011] In one embodiment, the reverse osmosis filtration assembly further includes an airbag structure disposed within the water passage gap.

[0012] In one embodiment, the sealing layer is made of glass fiber impregnated with resin and then wound around the outer periphery of the reverse osmosis filter element.

[0013] In one embodiment, the first filter element cover is provided with a connecting section protruding toward the central tube, the connecting section being sealed to the central tube, and a through groove being provided in the connecting section, through which the central tube communicates with the water passage gap.

[0014] In one embodiment, the connecting segment extends into the central tube, and the connecting segment and the central tube are sealed together by a sealing ring.

[0015] In one embodiment, a receiving groove is formed on the outer periphery of the connecting segment, and the sealing ring is disposed in the receiving groove.

[0016] In one embodiment, the first filter cover has a first limiting portion extending toward the reverse osmosis filter element, the first limiting portion being disposed around the outer periphery of the reverse osmosis filter element.

[0017] In one embodiment, the reverse osmosis filtration assembly further includes a second filter cartridge cover, one side of which is mounted on the filter bottle, and the opposite side of which is connected to the reverse osmosis filter cartridge.

[0018] In one embodiment, the second filter cover is provided with a first partition and a second partition. The first partition and the second partition separate the second filter cover into an inlet channel, a wastewater channel and an outlet channel. Raw water entering the inlet flows into the reverse osmosis filter element through the inlet channel. Wastewater in the reverse osmosis filter element flows out from the wastewater outlet through the wastewater channel. Filtered water flowing out from the water passage gap flows out from the outlet through the outlet channel.

[0019] In one embodiment, the second filter cover has a second limiting portion extending toward the reverse osmosis filter element, the second limiting portion being disposed around the outer periphery of the reverse osmosis filter element, and the sealing layer being disposed around the second limiting portion.

[0020] In one embodiment, the sealing layer is further disposed on the outer periphery of the first limiting portion and the second limiting portion.

[0021] In one embodiment, the reverse osmosis filtration assembly further includes an end cap, and the bottom of the filter bottle has an installation port, to which the end cap is installed.

[0022] This invention also proposes a water purification device, which includes a reverse osmosis filtration assembly. The reverse osmosis filtration assembly includes a filter bottle, a reverse osmosis filter element, a central tube, a sealing layer, and a first filter element cover. The filter bottle has an inlet, an outlet, and a wastewater outlet. The reverse osmosis filter element is disposed inside the filter bottle. The reverse osmosis filter element is sleeved on the central tube, and the central tube has a water passage hole communicating with the reverse osmosis filter element. A water passage gap exists between the reverse osmosis filter element and the filter bottle, and the central tube communicates with the filter bottle through the water passage gap. The filter element has an outlet; a sealing layer is disposed on the outer periphery of the reverse osmosis filter element, which separates the reverse osmosis filter element from the water passage gap; a first filter element cover is connected to one end of the reverse osmosis filter element and is sealed to the central tube; raw water is pressurized by a water pump and flows into the inlet, the gas in the filter bottle is compressed, and when the reverse osmosis filtration assembly stops operating, the compressed gas in the filter bottle gradually expands and recovers, squeezing the pure water in the central tube and the water passage gap back into the reverse osmosis filter element.

[0023] The technical solution of this invention employs a pure water path that is simultaneously set in the water passage gap and the central tube, and the pure water path is sealed with the reverse osmosis filter element. When the gas in the water passage gap is compressed by the pressure of the water pump, more pure water can fill the water passage gap. When the water pump is turned off, the gas volume in the water passage gap recovers, squeezing the pure water in the water passage gap back into the reverse osmosis filter element, thereby discharging some of the wastewater in the reverse osmosis filter element, increasing the TDS value of the water in the reverse osmosis filter element, and thus improving the taste of the first cup of water obtained by the user. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the reverse osmosis filtration assembly.

[0026] Figure 2 A schematic diagram showing the separation of the upper end cap, reverse osmosis filter element, central tube, and lower end cap;

[0027] Figure 3 An exploded view of a reverse osmosis filtration unit;

[0028] Figure 4 This is a schematic diagram of a reverse osmosis filtration unit from a cross-sectional view.

[0029] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 This is a schematic diagram of the reverse osmosis filtration assembly from another cross-sectional perspective.

[0031] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0032] Figure 8 This is a schematic diagram of the structure of the first filter element cover.

[0033] Explanation of icon numbers:

[0034] label name label name 10 Reverse osmosis filtration components 810 Second filter cover 100 Filter bottle 811 First dividing section 110 Receiving cavity 812 Second partition 120 Water passage gap 813 Water inlet channel 130 Installation port 814 Wastewater channel 200 Reverse osmosis filter cartridge 815 Water outlet channel 300 Shrinkage expansion component 816 First limiting section 410 Inlet 820 First filter cover 420 water outlet 821 Connection part 430 Wastewater outlet 821a Through slot 500 Central tube 822 Second limiting part 510 Water passage 822a Container slot 600 sealing layer 823 Water passage 700 End cap 900 sealing ring

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] As people increasingly prioritize quality of life, water quality has become a major concern. Water purifiers with reverse osmosis capabilities are gaining popularity due to the fresher, more hygienic, and safer purified water they produce. Raw water typically has a high total dissolved solids (TDS). Reverse osmosis filters, aided by a water pump, block a large number of ions in the raw water before reaching the osmosis membrane, ensuring that the TDS of the water passing through the membrane meets drinking water standards. However, if the water purifier is shut down for an extended period and then restarted, the first glass of purified water will have a higher TDS, resulting in lower quality water that does not meet the user's needs.

[0040] There is a water purification device that allows pure water filtered by a reverse osmosis filter to flow back into the reverse osmosis filter membrane, thereby reducing the TDS value of the first cup of water. However, the pure water path around the reverse osmosis filter occupies a large volume, and the pure water path is easily contaminated by the raw water or wastewater inside the reverse osmosis filter.

[0041] Compared to the existing filter structure, this filter structure changes the water inlet from the outer periphery and shell of the reverse osmosis filter to one end of the reverse osmosis filter. Furthermore, pure water is used to flow between the outer periphery and shell of the reverse osmosis filter. Therefore, this pure water is at risk of being contaminated by the raw water or wastewater inside the reverse osmosis filter.

[0042] The aforementioned TDS refers to Total Dissolved Solids (TDS), also known as the total amount of dissolved solids, and is measured in milligrams per liter (mg / L). It indicates how many milligrams of dissolved solids are dissolved in one liter of water. The higher the TDS value, the more dissolved substances are present in the water.

[0043] In view of this, the present invention proposes a reverse osmosis filtration component for installation in a water purification device to filter the raw water passing through it, thereby reducing the TDS value of the first cup of water and preventing contamination of the pure water path, so that users can experience a better taste of the first cup of water.

[0044] In embodiments of the present invention, such as Figures 1 to 4As shown, the reverse osmosis filtration assembly 10 includes a filter bottle 100, a reverse osmosis filter element 200, a central tube 500, a sealing layer, and a first filter element cover 820. The reverse osmosis filter element 200 is disposed inside the filter bottle 100. The reverse osmosis filter element 200 is sleeved on the central tube 500, and the central tube 500 has a water passage hole 510 communicating with the reverse osmosis filter element 200. A water passage gap 120 is formed between the reverse osmosis filter element 200 and the filter bottle 100, and the central tube 500 is connected to the water outlet 420 through the water passage gap 120. The sealing layer is disposed on the reverse osmosis filter element. The outer periphery of the filter element 200 is sealed to separate the reverse osmosis filter element 200 from the water passage gap 120. The first filter element cover 820 is connected to one end of the reverse osmosis filter element 200 and is sealed to the central tube 500. Raw water is pressurized by a water pump and flows into the inlet 410. The gas in the filter bottle 100 is compressed. When the reverse osmosis filtration assembly 10 stops operating, the compressed gas in the filter bottle 100 gradually expands and recovers, squeezing the pure water in the central tube 500 and the water passage gap 120 back into the reverse osmosis filter element 200.

[0045] It should be noted in advance that the vertical positional relationship shown in the attached diagram is only the position of the product in a certain state. In reality, the product is installed horizontally on the water circuit board along the axial direction of the filter bottle 100, and the outlet 420 is located below the inlet 410 in the radial direction of the filter bottle 100. The filter bottle 100 has a receiving cavity 110, which is used to accommodate other components of the reverse osmosis filter assembly 10, ensuring that the reverse osmosis filter assembly 10 is not disturbed by external factors. The filter bottle 100 is connected to the outside only through the inlet 410, outlet 420, and wastewater outlet 430. Regulating valves are installed in the inlet 410, outlet 420, and wastewater outlet 430, which can be used to adjust the opening degree of the inlet 410, outlet 420, and wastewater outlet 430 to meet the actual operating requirements of the water purification equipment.

[0046] It should be noted that the central tube 500 is located inside the reverse osmosis filter element 200, which provides support for the inside of the reverse osmosis filter element 200, preventing the reverse osmosis filter element 200 from being deformed by large water pressure, thereby ensuring that the water outlet of the reverse osmosis filter element 200 is unobstructed.

[0047] It should be noted that in the water purification equipment, in addition to the reverse osmosis filter component 10, there is also a device to pressurize the water entering the reverse osmosis filter element 200, thereby increasing the efficiency of the RO membrane in filtering pure water. The water pump in this invention is specifically a booster pump, but other types of pumps are also possible. When the user starts drawing water, the reverse osmosis filter element 200 is in working mode, with the inlet 410, outlet 420, and wastewater outlet 430 all open, continuously filtering out pure water. When the user stops drawing water, the outlet 420 immediately closes or gradually closes. At this time, the water pump continues to pressurize, the inlet 410 remains open for a period of time, and the wastewater outlet 430 is adjusted by the regulating valve to drain through a small orifice. The filter bottle 100 is in a high-pressure environment, so the gas inside the filter bottle 100 is compressed under high pressure, resulting in a higher volume of pure water in the central tube 500 and the water passage 120 than the volume of pure water when the gas pressure inside the filter bottle 100 is balanced with the external environment. When the water pump stops working, the pressure inside the filter bottle 100 gradually recovers due to the pressure regulation of the small orifice at the wastewater outlet 430. Consequently, the compressed gas inside the filter bottle 100 gradually recovers its volume. The pressure generated by this gas volume recovery forces some of the pure water in the water passage 120 and the central tube 500 back into the reverse osmosis filter element 200, thus discharging a portion of the wastewater from the reverse osmosis filter element 200. The gas used here can be air, or it can be an inert gas (extremely difficult to dissolve in water and difficult to be carried away by the water flow).

[0048] This allows the proportion of pure water in the reverse osmosis filter cartridge 200 to increase and the proportion of wastewater to decrease. When the user takes the first cup of water next time, the TDS value will be lower, improving the water quality and taste of the first cup of water and meeting the user's needs for purified water.

[0049] A sealing layer is disposed on the outer periphery of the reverse osmosis filter element 200. Considering that the inlet 410 is located at one end of the reverse osmosis filter element 200, the water entering the reverse osmosis filter element 200 enters from one end, and the inlet 410 is close to the outer periphery of the reverse osmosis filter element 200, the sealing layer seals the outer periphery of the reverse osmosis filter element 200 to prevent the water to be filtered from flowing into the water passage 120 and contaminating the pure water, thereby achieving the technical solution. Specifically, the sealing layer is made of glass flakes impregnated with resin and then wound around the outer periphery of the reverse osmosis filter element 200. Finally, after the resin solidifies, it fills the gaps between the glass flakes, allowing the sealing layer to isolate the water passage 120 from the reverse osmosis filter element 200.

[0050] In addition, the wastewater outlet 430 is also located at one end of the reverse osmosis filter element 200, so the water from the reverse osmosis filter element 200 flows out from one end of the reverse osmosis filter element 200. Furthermore, the wastewater outlet 430 is close to the inner wall of the reverse osmosis filter element 200. In order to prevent wastewater from flowing from the reverse osmosis filter element 200 into the central tube 500 and contaminating the pure water circuit, a first filter element cover 820 is provided to connect to one end of the reverse osmosis filter element 200. The first filter element cover 820 and the central tube 500 are sealed together to prevent wastewater from flowing into the central tube 500 from the gap between the first filter element cover 820 and the central tube 500 and contaminating the pure water circuit, thereby reducing the TDS value of the first cup of water and improving the taste of the first cup of water.

[0051] This reverse osmosis filter assembly 10 is used in water purification equipment. In addition to the reverse osmosis filter element 200, a pre-filter assembly is also installed upstream of the inlet 410. This means that the water entering the inlet 410 is filtered through the pre-filter. During pre-filter filtration, the pre-filter adsorbs larger particles of impurities in the water, performing preliminary filtration of the raw water. Then, the RO membrane of the reverse osmosis filter element 200 filters out most of the salt ions in the water. Furthermore, a post-filter assembly is installed downstream of the reverse osmosis filter element 200. The filtered water, after passing through the reverse osmosis filter assembly 10, is then filtered again by the post-filter to remove color and adjust the taste before flowing from the tap to the user.

[0052] In this embodiment, the reverse osmosis filtration component 10 is integrated into the filter bottle 100. Alternatively, the pre-filter component, the post-filter component, and the reverse osmosis filtration component 10 can be integrated into the same filter bottle 100, or the pre-filter and the post-filter can be integrated into the same filter bottle 100.

[0053] The technical solution of this invention employs a method where a pure water path is simultaneously set within the water passage 120 and the central tube 500, and the pure water path is sealed to the reverse osmosis filter element 200. When the gas in the water passage 120 is compressed by the pressure of the water pump, more pure water can fill the water passage 120. When the water pump is turned off, the gas volume in the water passage 120 recovers, squeezing the excess pure water in the water passage 120 back into the reverse osmosis filter element 200. This discharges some of the wastewater from the reverse osmosis filter element 200, increases the TDS value of the water in the reverse osmosis filter element 200, and thus improves the taste of the first cup of water obtained by the user.

[0054] In one embodiment, please refer to Figure 2 and Figure 4 The first filter element cover 820 is provided with a connecting section 821 that protrudes toward the central tube 500. The connecting section 821 is sealed to the central tube 500. A through groove 821a is provided in the connecting section 821. The central tube 500 communicates with the water passage gap 120 through the through groove 821a.

[0055] Specifically, the first filter cover 820 also has the function of guiding pure water in the central tube 500 to the water passage 120. Therefore, a connecting section 821 protruding towards the reverse osmosis filter element 200 is provided in the middle of the first filter cover 820. A through groove 821a is provided in the connecting section 821, through which the central tube 500 and the water passage 120 can be connected.

[0056] As described in the above embodiments, the bottom of the first filter element cover 820 is provided with a water flow channel. One side of the water flow channel is connected to the through groove 821a, and the other side is connected to the water flow gap 120. Considering that the upper surface of the first filter element cover 820 is circular, the number of water flow channels can be one, two, or more. In this embodiment, four water flow channels are provided, two of which are arranged in a straight line, and the other two are also arranged in a straight line. The included angle between two adjacent water flow channels is 90°. Providing multiple water flow channels can accommodate high-flow reverse osmosis filter components 10.

[0057] In one embodiment, please refer to Figure 4 and Figure 5 The connecting segment 821 extends into the central tube 500, and the connecting segment 821 and the central tube 500 are sealed together by a sealing ring 900.

[0058] It should be noted that a sealing ring 900 is installed between the outer side of the connecting section 821 and the inner wall of the central tube 500 for sealing. Alternatively, the diameter of the connecting section 821 can be larger than the diameter of the central tube 500, with the central tube 500 extending into the connecting section 821, meaning the inner wall of the connecting section 821 and the outer wall of the central tube 500 are sealed by the sealing ring 900. This seal prevents wastewater from the filter element from flowing into the central tube 500 and contaminating the pure water circuit, thereby reducing the TDS value.

[0059] In one embodiment, please refer to Figure 5 The connecting section 821 has a receiving groove 822a on its outer periphery, and the sealing ring 900 is disposed in the receiving groove 822a.

[0060] Specifically, since the sealing ring 900 has a certain thickness, a receiving groove 822a is provided on the outer periphery of the connecting section 821 to accommodate the sealing ring 900. This also makes it easier for the connecting section 821 and the central tube 500 to seal and match. Of course, the receiving groove 822a could also be formed on the inner wall of the central tube 500, but considering that the central tube 500 is relatively thin, in order to ensure its structural strength, the receiving groove 822a is formed on the outer periphery of the connecting section 821.

[0061] In one embodiment, please refer to Figure 2 and Figure 4The first filter cover 820 has a first limiting portion 816 extending toward the reverse osmosis filter 200, and the first limiting portion 816 is disposed around the outer periphery of the reverse osmosis filter 200.

[0062] It should be noted that the first filter cover 820 is located at one end of the reverse osmosis filter element 200, thus the first filter cover 820 has two opposing sides. The first filter cover 820 extends towards the side closest to the reverse osmosis filter element 200, forming a first limiting part 816. The first limiting part 816 is circumferentially disposed around the outer periphery of the reverse osmosis filter element 200, limiting and fixing it circumferentially to prevent the reverse osmosis filter element 200 from being deformed by water pressure impact, thereby improving the service life of the reverse osmosis filter element 200. The first filter cover 820 is connected to the reverse osmosis filter element 200, specifically by adhesive bonding, thus improving the fixing effect between the first filter cover 820 and the reverse osmosis filter element 200.

[0063] In one embodiment, please refer to Figure 4 The reverse osmosis filtration assembly 10 further includes a second filter element cover 810, the upper side of which is installed on the filter bottle 100, and the lower side of which is connected to the reverse osmosis filter element 200.

[0064] It should be noted that, in order to fix the reverse osmosis filter element 200, the reverse osmosis filtration assembly 10 proposed in this invention also includes a second filter element cover 810. The lower side of the second filter element cover 810 is installed on the filter bottle 100, so that the second filter element cover 810 can be fixed to the filter bottle 100. The upper side of the second filter element cover 810 is connected to the reverse osmosis filter element 200. The connection method here is adhesive bonding. In this way, one end of the reverse osmosis filter element 200 can be fixed to the second filter element cover 810, avoiding the reverse osmosis filter element 200 from being deformed and misaligned due to water pressure impact, thereby extending the service life of the reverse osmosis filter element 200.

[0065] In one embodiment, please refer to Figure 4 The second filter cover 810 is provided with a first partition 811 and a second partition 812. The first partition 811 and the second partition 812 divide the second filter cover 810 into an inlet channel 813, a wastewater channel 814 and an outlet channel 815. The raw water entering the inlet 410 flows into the reverse osmosis filter 200 through the inlet channel 813. The wastewater in the reverse osmosis filter 200 flows out from the wastewater outlet 430 through the wastewater channel 814. The filtered water flowing out from the water passage 120 flows out from the outlet 420 through the outlet channel 815.

[0066] The second filter cover 810 has a protruding first partition 811 and a second partition 812. The first partition 811 and the second partition 812 divide the second filter cover 810 into an inlet channel 813, a wastewater channel 814 and an outlet channel 815. The inlet 410, wastewater outlet 430 and outlet 420 on the filter bottle 100 are respectively corresponding to the inlet channel 813, wastewater channel 814 and outlet channel 815 of the second filter cover 810.

[0067] In one embodiment, please refer to Figure 2 and Figure 3 The sealing layer is also disposed on the outer periphery of the second filter element cover 810 and the first filter element cover 820. It should be noted that, considering that the second filter element cover 810 and the first filter element cover 820 are bonded to the reverse osmosis filter element 200, the sealing layer is also disposed on the outer periphery of the second filter element cover 810 and the first filter element cover 820. Specifically, the reverse osmosis filter element 200 is first bonded to the first filter element cover 820 and the second filter element cover 810 respectively, and then the sealing layer is wrapped around the outer periphery of the first filter element cover 820, the reverse osmosis filter element 200, and the second filter element cover 810 to prevent raw water from seeping into the water passage 120 and contaminating the pure water circuit.

[0068] In one embodiment, the second filter cover 810 has a second limiting portion 822 extending toward the reverse osmosis filter element 200, the second limiting portion 822 being disposed around the outer periphery of the reverse osmosis filter element 200, and the sealing layer being disposed around the second limiting portion 822.

[0069] Specifically, the second filter cover 810 is located at one end of the reverse osmosis filter element 200, thus having two opposing sides. The second filter cover 810 extends towards the side closest to the reverse osmosis filter element 200, forming a second limiting portion 822. The second limiting portion 822 is circumferentially disposed around the outer periphery of the reverse osmosis filter element 200, limiting and fixing it circumferentially to prevent deformation of the reverse osmosis filter element 200 due to water pressure impact, thereby extending its service life. The second filter cover 810 is connected to the reverse osmosis filter element 200 by adhesive bonding, resulting in better fixation between the second filter cover 810 and the reverse osmosis filter element 200.

[0070] In one embodiment, please refer to Figure 4 The reverse osmosis filter assembly 10 also includes an airbag structure, which is disposed within the water passage gap 120.

[0071] It should be noted that the reverse osmosis filter assembly 10 also includes an air bladder structure. This air bladder structure has the characteristic of shrinking in volume under pressure and restoring its volume when the pressure is removed. The air bladder structure is an elastic structure filled with gas. The shape of the air bladder can be sheet-like, block-like, or cylindrical. In this embodiment, to match the water passage gap 120, the air bladder structure is set to a cylindrical shape.

[0072] When the user stops drawing water, the outlet 420 immediately closes or gradually closes. At this time, the water pump continues to pressurize, the inlet 410 remains open for a period, and the wastewater outlet 430 is adjusted by the regulating valve to drain through a small orifice. The filter bottle 100 is in a high-pressure environment, so the air bladder structure inside the filter bottle 100 is compressed under high pressure, resulting in a higher volume of pure water in the central tube 500 and the water passage gap 120 than the volume of pure water when the air pressure inside the filter bottle 100 is balanced with the external environment. When the water pump stops working, the air pressure inside the filter bottle 100 gradually recovers due to the pressure adjustment of the small orifice at the wastewater outlet 430. Consequently, the compressed air bladder structure inside the filter bottle 100 also recovers its volume. The pressure from the recovery of the air bladder structure forces some of the pure water in the water passage gap 120 and the central tube 500 back into the reverse osmosis filter element 200, thereby discharging some of the wastewater from the reverse osmosis filter element 200. This improves the taste of the first cup of water drawn by the user and reduces the TDS value of the first cup of water.

[0073] In one embodiment, please refer to Figure 3 The reverse osmosis filtration assembly 10 further includes an end cap 700, and the bottom of the filter bottle 100 has an installation port 130, on which the end cap 700 is installed.

[0074] It should be noted that the top of the filter bottle 100 has an installation port 130 for placing other components such as the reverse osmosis filter element 200 into the filter bottle 100. The end cap 700 is installed on the installation port 130. The installation method can be that the end cap 700 is hinged to the filter bottle 100 and the filter bottle 100 is covered on the installation port 130, or the end cap 700 is glued to the filter bottle 100. In this embodiment, the installation port 130 is sealed by welding the end cap 700 to the filter bottle 100 to achieve better sealing between the filter bottle 100 and the end cap 700.

[0075] This invention also proposes a water purification device, which includes a reverse osmosis filter assembly 10. The specific structure of the reverse osmosis filter assembly 10 is as described in the above embodiments. Since this water purification device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The water purification device can be a water purifier, a water dispenser, a water softener / purifier combo machine, or a water purifier / heater combo machine, or other products with water purification functions.

[0076] The above description is merely an optional 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's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A reverse osmosis filtration component, characterized in that, include: A filter bottle, wherein the filter bottle is provided with an inlet, an outlet and a wastewater outlet; The reverse osmosis filter element is installed inside the filter bottle; The central tube is fitted with the reverse osmosis filter element, and the central tube has a water passage hole that connects to the reverse osmosis filter element. There is a water passage gap between the reverse osmosis filter element and the filter bottle, and the central tube is connected to the water outlet through the water passage gap. A sealing layer is disposed on the outer periphery of the reverse osmosis filter element, the sealing layer being used to separate the reverse osmosis filter element from the water passage gap; The first filter element cover is connected to one end of the reverse osmosis filter element, and the first filter element cover is sealed to the central tube. An airbag structure is disposed within the water passage gap; the airbag structure is an elastic structure filled with gas; the airbag structure is cylindrical. When the water pump pressurizes the filter bottle, the gas inside the filter bottle is compressed. When the water pump stops pressurizing, the compressed gas inside the filter bottle expands and recovers, squeezing the pure water in the central tube and the water passage gap back into the reverse osmosis filter element. The first filter element cover is provided with a connecting section protruding towards the central tube. The connecting section is sealed to the central tube. A through groove is provided in the connecting section. The central tube communicates with the water passage gap through the through groove. The connecting section extends into the central tube. The connecting section and the central tube are sealed together by a sealing ring.

2. The reverse osmosis filtration assembly as described in claim 1, characterized in that, The sealing layer is made of glass fiber impregnated with resin and then wrapped around the outer periphery of the reverse osmosis filter element.

3. The reverse osmosis filtration assembly as described in claim 1, characterized in that, The outer periphery of the connecting section is provided with a receiving groove, and the sealing ring is disposed in the receiving groove.

4. The reverse osmosis filtration assembly as described in claim 3, characterized in that, The first filter element cover has a first limiting portion extending toward the reverse osmosis filter element, the first limiting portion being disposed around the outer periphery of the reverse osmosis filter element.

5. The reverse osmosis filtration assembly as described in claim 4, characterized in that, The reverse osmosis filtration assembly also includes a second filter element cover, one side of which is installed on the filter bottle, and the other side of which is connected to the reverse osmosis filter element.

6. The reverse osmosis filtration assembly as described in claim 5, characterized in that, The second filter cover is provided with a first partition and a second partition. The first partition and the second partition separate the second filter cover into an inlet channel, a wastewater channel and an outlet channel. The raw water entering the inlet flows into the reverse osmosis filter through the inlet channel. The wastewater in the reverse osmosis filter flows out from the wastewater outlet through the wastewater channel. The filtered water flowing out from the water passage gap flows out from the outlet through the outlet channel.

7. The reverse osmosis filtration assembly as described in claim 6, characterized in that, The second filter element cover has a second limiting portion extending toward the reverse osmosis filter element, the second limiting portion being disposed around the outer periphery of the reverse osmosis filter element, and the sealing layer being disposed around the second limiting portion.

8. The reverse osmosis filtration assembly as described in claim 7, characterized in that, The sealing layer is also disposed on the outer periphery of the first limiting part and the second limiting part.

9. The reverse osmosis filtration assembly as described in claim 1, characterized in that, The reverse osmosis filtration assembly also includes an end cap, and the bottom of the filter bottle has an installation port, on which the end cap is installed.

10. A water purification device, characterized in that, Includes the reverse osmosis filtration assembly as described in any one of claims 1 to 9.

Images