Reverse osmosis filter assembly and water purification equipment

Abstract

The utility model discloses a reverse osmosis filter assembly and water purification equipment, and relates to the technical field of water purification, and the reverse osmosis filter assembly comprises a shell, a central pipe and a filter element assembly, the shell is provided with a water inlet, a water outlet and a wastewater port; the central pipe is arranged in the shell and is provided with a pure water flow channel communicated with the water outlet and a waste water flow channel communicated with the waste water opening; a raw water inlet side of the filter element assembly is communicated with the water inlet, a wastewater outlet side is communicated with the wastewater flow channel, and a pure water outlet side is communicated with the pure water flow channel; wherein a water storage cavity is formed between the filter element assembly and the shell, the water storage cavity is communicated with the pure water flow channel, and gas is contained in the water storage cavity. The reverse osmosis filter assembly can solve the problem that the TDS value of the first cup of water of water purification equipment is high.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, and particularly relates to a reverse osmosis filtration component and a water purification device. Background Art

[0002] With the pursuit of the public for the quality of life, the level of water quality has begun to attract much attention. Water purification devices with reverse osmosis function are becoming more and more popular among the public because the purified water produced by them is fresher, more hygienic and safer. Raw water (i.e., the water to be filtered) usually has a high TDS. Under the action of a booster pump, the reverse osmosis filter element can block a large number of ions in the raw water in front of the permeation membrane, so that the TDS of the water passing through the permeation membrane meets the standard of direct drinking water. However, when the water purification device stops for a long time and stands still, when it is restarted, the TDS of the first cup of pure water is too high, resulting in low quality of the first cup of pure water and the water quality not meeting the needs of users.

[0003] The aforementioned TDS refers to Total Dissolved Solids (English: Total dissolved solids, abbreviated as TDS), also known as total dissolved solids, and the measurement unit is milligrams per liter (mg / L). It indicates how many milligrams of dissolved solids are dissolved in 1 liter of water. The higher the TDS value, the more dissolved substances are contained in the water. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a reverse osmosis filtration component and a water purification device, aiming to solve the problem that the TDS value of the first cup of water in the water purification device is too high.

[0005] To achieve the above object, the reverse osmosis filtration component proposed by the utility model includes a housing, a central tube and a filter element assembly; the housing is provided with a water inlet, a water outlet and a wastewater outlet; the central tube is arranged inside the housing and has a pure water flow channel communicated with the water outlet and a wastewater flow channel communicated with the wastewater outlet; the filter element assembly is arranged inside the housing and sleeved on the central tube; the filter element assembly has a raw water inlet side, a wastewater outlet side and a pure water outlet side, the raw water inlet side is communicated with the water inlet, the wastewater outlet side is communicated with the wastewater flow channel, and the pure water outlet side is communicated with the pure water flow channel; wherein, a water storage cavity is formed between the filter element assembly and the housing, the water storage cavity is communicated with the pure water flow channel, and there is gas in the water storage cavity.

[0006] In an embodiment, the central tube includes an inner tube body and an outer tube body, the inner tube body is located inside the outer tube body, the inner tube body forms the pure water flow channel, and the wastewater flow channel is formed between the inner tube body and the outer tube body.

[0007] In one embodiment, the filter element assembly includes a reverse osmosis filter element, a first end cap and a second end cap respectively disposed at two ends of the reverse osmosis filter element. The reverse osmosis filter element is sleeved on the outer tube body. The first end cap is disposed on a side of the reverse osmosis filter element away from the water inlet, and the second end cap is disposed on a side of the reverse osmosis filter element close to the water inlet. Both the first end cap and the second end cap are adhesively bonded to the reverse osmosis filter element.

[0008] In one embodiment, the first end cap is provided with a water flow channel, and the pure water flow channel and the water storage cavity are communicated through the water flow channel.

[0009] In one embodiment, the first end cap is provided with a slot corresponding to the inner tube body. The slot is communicated with the water flow channel. The inner tube body is inserted into the slot and is sealingly connected to the slot.

[0010] In one embodiment, one end of the water flow channel is communicated with the pure water flow channel, and the other end is communicated with the water storage cavity. And a port of the end of the water flow channel communicated with the water storage cavity is disposed towards the side wall of the housing.

[0011] In one embodiment, the reverse osmosis filter element is arranged in an annular column shape, and a waterproof sealing layer is arranged on the outer peripheral wall of the reverse osmosis filter element.

[0012] In one embodiment, the inner tube body and the outer tube body are coaxially arranged.

[0013] In one embodiment, the outer wall surface of the end of the inner tube body close to the water outlet is connected to the inner wall surface of the outer tube body through an annular plug. A pure water buffer cavity is formed between the annular plug and the end face of the outer tube body end. The pure water buffer cavity is communicated with the pure water flow channel, and the diameter of the pure water buffer cavity is larger than that of the pure water flow channel.

[0014] In one embodiment, the outer tube body is provided with a pure water water inlet, a first waste water water inlet and a second waste water water inlet. The pure water outlet side and the pure water flow channel are communicated through the pure water water inlet. The first waste water water inlet communicates the waste water outlet side and the waste water flow channel. The second waste water water inlet communicates the waste water outlet and the waste water flow channel.

[0015] In one embodiment, the central tube is further provided with a connecting pipe. The connecting pipe penetrates through the side wall of the outer tube body and is communicated with the pure water flow channel formed in the inner tube body. Both ends of the connecting pipe form the pure water water inlet.

[0016] In one embodiment, there are a plurality of the connecting pipes, and the plurality of connecting pipes are arranged at intervals along the axial direction of the central tube.

[0017] In one embodiment, the first waste water inlet is a water passing notch formed at one end of the outer pipe body; the second waste water inlet is formed at the other end of the outer pipe body and is disposed close to the waste water outlet.

[0018] In one embodiment, the central pipe penetrates through the second end cover and is hermetically connected to the second end cover and the housing; the second end cover is hermetically connected to the housing and forms a separated first chamber and second chamber. The first chamber communicates with the raw water inlet side and the water inlet, and the second chamber communicates with the waste water flow channel and the waste water outlet.

[0019] In one embodiment, the gas in the water storage chamber is air, nitrogen or inert gas.

[0020] The present utility model further provides a water purification device, which includes the reverse osmosis filtration assembly. The reverse osmosis filtration assembly includes a housing, a central pipe and a filter element assembly; the housing is provided with a water inlet, a water outlet and a waste water outlet; the central pipe is disposed inside the housing and has a pure water flow channel communicating with the water outlet and a waste water flow channel communicating with the waste water outlet; the filter element assembly is disposed inside the housing and sleeved on the central pipe; the filter element assembly has a raw water inlet side, a waste water outlet side and a pure water outlet side. The raw water inlet side communicates with the water inlet, the waste water outlet side communicates with the waste water flow channel, and the pure water outlet side communicates with the pure water flow channel; wherein, a water storage chamber is formed between the filter element assembly and the housing, the water storage chamber communicates with the pure water flow channel, and the water storage chamber contains gas.

[0021] The technical solution of the present utility model, by adopting a central pipe respectively formed with independent pure water flow channel and waste water flow channel, the waste water and pure water generated after being filtered by the filter element assembly respectively flow out directly through the waste water flow channel and the pure water flow channel inside the central pipe, without the need for the filter element assembly itself to effectively separate the pure water and the waste water, simplifies the internal flow channel structure of the filter element assembly, and the waste water flow channel and the pure water flow channel do not interfere with each other, avoiding the situation of cross contamination between the waste water and the pure water. At the same time, gas is filled in the water storage chamber. When the reverse osmosis filtration assembly stops operating, the gas in the water storage chamber is first compressed. When the pressure is balanced, the compressed gas in the water storage chamber begins to return to its original volume, and the pressure is released through water from the central pipe to the reverse osmosis filter element, thereby pressing the pure water in the pure water flow channel and the water storage chamber to the filtration area of the filter element assembly. And at this time, the waste water outlet is in an open state, and the high-concentration waste water in the filtration area of the filter element assembly can be accurately discharged, thereby reducing the TDS value of the concentrated water in the filtration area of the filter element assembly, achieving an ultra-high first glass of water effect, and avoiding the problem that the TDS value of the first few glasses of pure water is too high when the water purification device is restarted. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 Schematic diagram of the three-dimensional structure of an embodiment of the reverse osmosis filtration assembly provided by the present invention;

[0024] Figure 2 For Figure 1 Schematic diagram of the three-dimensional structure of another perspective of the reverse osmosis filtration assembly in

[0025] Figure 3 For Figure 1 Exploded view of the reverse osmosis filtration assembly in

[0026] Figure 4 For Figure 1 Schematic diagram of the structure of another perspective of the reverse osmosis filtration assembly in

[0027] Figure 5 For Figure 4 Cross-sectional view along the K-K line in

[0028] Figure 6 For Figure 5 Partial enlarged view at A in

[0029] Figure 7 For Figure 4 Cross-sectional view along the M-M line in

[0030] Figure 8 For Figure 7 Partial enlarged view at B in

[0031] Figure 9 For Figure 4 Cross-sectional view of the reverse osmosis filtration assembly from this perspective in

[0032] Figure 10 For Figure 1 Schematic diagram of the three-dimensional structure of the central pipe in

[0033] Figure 11 For Figure 10 Cross-sectional view of the central pipe in

[0034] Figure 12 Schematic diagram of the raw water-pure water water flow direction of the reverse osmosis filtration assembly provided by the present invention;

[0035] Figure 13Schematic diagram of the raw water - wastewater water flow direction of the reverse osmosis filtration module provided by the present utility model.

[0036] Explanation of the reference numerals in the appended drawings:

[0037] 10. Reverse osmosis filtration module;

[0038] 100. Housing; 110. Water inlet; 120. Water outlet; 130. Waste water outlet; 140. Filter bottle; 141. Bottle body; 141a. Accommodation cavity; 142. Adapter plate; 150. Installation cover;

[0039] 200. Central tube; 200a. Pure water flow channel; 200b. Waste water flow channel; 200c. Pure water buffer cavity; 210. Inner tube body; 220. Outer tube body; 221. First waste water water passing port; 222. Second waste water water passing port; 230. Annular plug; 240. Connecting pipe; 241. Pure water water passing port;

[0040] 300. Filter element assembly; 300a. Raw water inlet side; 300b. Waste water outlet side; 300c. Pure water outlet side; 310. Reverse osmosis filter element; 320. First end cap; 320a. Water passing flow channel; 321. Slot; 330. Second end cap; 331. First chamber; 332. Second chamber; 400. Water storage cavity;

[0041] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0042] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0043] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0045] With the public's pursuit of the quality of life, the level of water quality has begun to attract much attention. Water purification equipment with reverse osmosis function is becoming more and more popular among the public because the purified water produced is fresher, more hygienic, and safer. The solution-diffusion theory holds that the reverse osmosis membrane / nanofiltration membrane is a pore-free and complete membrane. Both water molecules and solutes such as salts can dissolve in the membrane. Under the action of an external pressure, the water molecules and solute molecules dissolved in the membrane will diffuse to the other side of the reverse osmosis membrane / nanofiltration membrane, but the diffusion rates are different. In existing water purification equipment, during normal water production, the diffusion rate of water molecules under external pressure is much greater than that of solute molecules. Therefore, water molecules will quickly pass through the reverse osmosis membrane / nanofiltration membrane, and most solute molecules will accumulate on the raw water side, thus achieving the separation of solute molecules and water molecules. When the water purification equipment stops operating and stands still for a long time, the concentration of solute molecules on the raw water side is much higher than that on the pure water side. Under the drive of the concentration gradient, solute diffusion will occur. Solute molecules will gradually pass through the reverse osmosis membrane / nanofiltration membrane and eventually make the water in front of the membrane and the water behind the membrane reach diffusion equilibrium. This will cause the TDS value of the first cup of pure water to be too high when the water purification equipment is restarted, resulting in a low quality of the first cup of pure water and the water quality not meeting the needs of users.

[0046] The aforementioned TDS refers to Total Dissolved Solids (abbreviation: TDS in English), also known as the total amount of dissolved solids, and the measurement unit is milligrams per liter (mg / L). It indicates how many milligrams of dissolved solids are dissolved in 1 liter of water. The higher the TDS value, the more dissolved substances the water contains.

[0047] The present utility model provides a reverse osmosis filtration assembly to solve the problem of too high TDS value of the first cup of water in water purification equipment. The reverse osmosis filtration assembly of the present utility model is applied to water purification equipment, and the water purification equipment is a water dispenser, a drinking fountain, or a pure water machine.

[0048] Please refer to Figures 1 to 5, in an embodiment of the present utility model, the reverse osmosis filtration assembly 10 includes a housing 100, a central tube 200, and a filter element assembly 300; the housing 100 is provided with a water inlet 110, a water outlet 120, and a wastewater outlet 130; the central tube 200 is disposed inside the housing 100 and has a pure water flow channel 200a communicating with the water outlet 120 and a wastewater flow channel 200b communicating with the wastewater outlet 130; the filter element assembly 300 is disposed inside the housing 100 and sleeved on the central tube 200; the filter element assembly 300 has a raw water inlet side 300a, a wastewater outlet side 300b, and a pure water outlet side 300c, the raw water inlet side 300a communicates with the water inlet 110, the wastewater outlet side 300b communicates with the wastewater flow channel 200b, and the pure water outlet side 300c communicates with the pure water flow channel 200a; wherein, a water storage cavity 400 is formed between the filter element assembly 300 and the housing 100, the water storage cavity 400 communicates with the pure water flow channel 200a, there is gas in the water storage cavity 400, and when the gas is compressed and then returns to its original volume, the compressed gas can press the pure water in the water outlet flow channel into the reverse osmosis filter element 310.

[0049] Specifically, please refer to Figure 1 and Figure 3 , the housing 100 includes a filter bottle 140 and a mounting cover 150. An accommodation cavity 141a for mounting the central tube 200 and the filter element assembly 300 is formed inside the filter bottle 140. The filter bottle 140 is generally arranged in a cylindrical shape, with one end open, through which the filter element assembly 300, the central tube 200 and other structures are installed into the accommodation cavity 141a. The mounting cover 150 covers the open end of the filter bottle 140, and the two can be connected by a rotational welding technique, that is, by friction between plastic workpieces through spin melting to generate heat, melting the contact surface, and relying on external pressure and drive to rotate and solidify the workpieces into one body to ensure the sealing of the reverse osmosis filtration assembly 10 and prevent water leakage.

[0050] Furthermore, please refer to Figure 2 and Figure 3, the filter bottle 140 includes a bottle body 141 and a connection plate 142. A receiving cavity 141a is formed in the bottle body 141. The connection plate 142 is installed at one end of the bottle body 141 away from the mounting cover 150. An inlet 110, an outlet 120, and a waste water outlet 130 that communicate with the receiving cavity 141a are provided on the connection plate 142. The setting of the connection plate 142 can integrate the inlet 110, the outlet 120, and the waste water outlet 130 that are respectively connected to the raw water inlet side 300a, the waste water outlet side 300b, and the pure water outlet side 300c of the filter element assembly 300, which is convenient for connecting with other pipelines or water circuit boards. Among them, the inlet 110 is used for the water to be filtered to flow into the housing 100, the outlet 120 is used for the pure water filtered by the filter element assembly 300 to flow out, and the waste water outlet 130 is used for the waste water filtered by the filter element assembly 300 to flow out. It should be noted here that the pure water mentioned above and hereinafter refers to pure water with a lower TDS; the waste water refers to concentrated water with a higher TDS. The central tube 200 is arranged in the filter bottle 140 and has a pure water flow channel 200a communicating with the outlet 120 and a waste water flow channel 200b communicating with the waste water outlet 130.

[0051] Please refer to Figures 3 to 5 , the filter element assembly 300 is arranged in the receiving cavity 141a and is sleeved on the central tube 200. And the filter element assembly 300 has a raw water inlet side 300a, a waste water outlet side 300b, and a pure water outlet side 300c. The raw water inlet side 300a is communicated with the inlet 110, the waste water outlet side 300b is communicated with the waste water flow channel 200b, and the pure water outlet side 300c is communicated with the pure water flow channel 200a; that is to say, the water flowing into the receiving cavity 141a from the inlet 110 first flows through the raw water inlet side 300a of the filter element assembly 300 for filtration. After filtration, the water is divided into two paths (Please refer to Figure 12 and Figure 13 ,), one path is waste water and the other is pure water. The waste water flows through the waste water flow channel 200b and is discharged from the waste water outlet 130, and the pure water flows through the pure water flow channel 200a and is discharged from the outlet 120 for the user to directly drink or flow into the next filtration module for re-filtration.

[0052] Since the inlet 110, the outlet 120, and the waste water outlet 130 are all arranged on the same side of the housing 100, and the pure water flow channel 200a and the waste water flow channel 200b are both formed in the central tube 200, so the waste water and pure water generated after filtration by the filter element assembly 300 respectively flow out directly through the waste water flow channel 200b and the pure water flow channel 200a in the central tube 200, without the need for the filter element assembly 300 itself to effectively separate the pure water and the waste water, which simplifies the internal flow channel structure of the filter element assembly 300. At the same time, the waste water flow channel 200b and the pure water flow channel 200a do not interfere with each other, avoiding the occurrence of cross-contamination between the waste water and the pure water.

[0053] Please refer to Figures 7 to 9 , a water storage cavity 400 is also formed between the filter element assembly 300 and the housing 100. The water storage cavity 400 is communicated with the pure water flow channel 200a. That is to say, part of the pure water flowing into the pure water flow channel 200a after being filtered by the filter element assembly 300 flows out through the water outlet 120 for users to use or for re - filtration, and the other part flows into the water storage cavity 400 for storage. This greatly increases the amount of pure water in the housing 100 of the reverse osmosis filtration assembly 10. When the reverse osmosis filtration assembly 10 is stopped and not in use, since the total amount of wastewater remains unchanged and the total amount of pure water increases greatly, when solute molecules gradually pass through the reverse osmosis membrane / nanofiltration membrane and finally reach diffusion equilibrium between the water in front of the membrane and the water behind the membrane, the TDS value of the water in the pure water flow channel 200a is relatively low at this time, greatly increasing the ratio of internal pure water to the original wastewater, so as to meet the user's usage requirements.

[0054] It should be noted that there is a gas insoluble in water in the water storage cavity 400. The gas can be air, nitrogen or inert gas (extremely difficult to dissolve in water and difficult to be carried away by water flow), etc., and no specific limitation is made here. Among them, when the gas is air, since the housing 100 does not need to be evacuated after the filter element assembly 300 is assembled, the air directly exists in the pure water flow channel 200a and the water storage cavity 400 communicated with the pure water flow channel 200a; when the gas is nitrogen or inert gas, the housing 100 can be evacuated after the filter element assembly 300 is assembled, and then the required nitrogen, inert gas or other gases are filled into the water outlet flow channel.

[0055] Please refer to Figure 7 , when the reverse osmosis filtration assembly 10 is in the on - state, the raw water (i.e., the water to enter the reverse osmosis filter element 310) is pressurized under the action of the booster pump and flows into the filtration area in the filter element assembly 300 from the water inlet 110 for osmotic filtration to generate wastewater and pure water. The pure water flows along the pure water flow channel 200a under the action of pressure to the water outlet 120 to discharge water, and part of it flows into the water storage cavity 400.

[0056] When the reverse osmosis filtration module 10 stops operating, the water intake process is halted, meaning that water does not flow out of the water outlet 120 at this time, which is equivalent to the water outlet 120 being closed. However, due to the presence of gas in the water storage cavity 400, there is a process of delayed shutdown to achieve pressure balance for the entire water purification device. During this process, the cavity inside the housing 100 is in a high-pressure state. The pure water first compresses the gas in the water storage cavity 400. When the pressure is balanced, the compressed gas in the water storage cavity 400 begins to return to its original volume, and the pressure is released through the water flowing from the central tube 200 to the reverse osmosis filter element 310, thereby pressing the pure water in the pure water flow channel 200a into the filtration area of the filter element module 300 (i.e., inside the reverse osmosis filter element 310). And at this time, the wastewater outlet 130 is in an open state, and the high-concentration wastewater inside the reverse osmosis filter element 310 can be accurately discharged, thereby reducing the TDS of the concentrated water in the reverse osmosis filter element 310 and achieving an excellent first glass of water effect, avoiding the problem of high TDS in the first few glasses of pure water when the water purification device is restarted. At the same time, since the inside of the reverse osmosis filter element 310 has been replaced by pure water instead of the previous raw water, the ratio of internal pure water to raw wastewater has been significantly increased, and its permeated concentration is lower itself.

[0057] Please refer to Figure 7 , more specifically, in the water purification device, outside the reverse osmosis filtration module 10, a booster pump is provided to pressurize the water to be filtered entering the filter element module 300. In this way, the efficiency of the filter membrane of the filter element module 300 for filtering pure water can be increased. When the user starts to receive water, the reverse osmosis filtration module 10 is in the working mode, and the water inlet 110, the water outlet 120, and the wastewater outlet 130 are all open, and the filtration area of the filter element module 300 continuously filters out pure water. When the user stops receiving water, the water outlet 120 is immediately closed or gradually closed. At this time, the booster pump continues to pressurize, the water inlet 110 remains open for a period of time, and the wastewater outlet 130 is adjusted by the regulating valve to drain water in a small hole. The inside of the housing 100 is in a high-pressure environment, so the gas in the water storage cavity 400 is compressed by the high pressure, making the amount of pure water in the pure water flow channel 200a and the water storage cavity 400 higher than the amount of pure water when the air pressure inside the housing 100 is balanced with the outside. When the booster pump stops working, due to the small hole of the wastewater outlet 130 regulating the air pressure, the air pressure inside the housing 100 gradually returns to normal, and then the compressed gas in the water storage cavity 400 gradually returns to its original volume. The pressure brought by the gas volume recovery squeezes part of the pure water in the water storage cavity 400 and the pure water flow channel 200a of the central tube 200 to flow back into the filtration area of the filter element module 300, and then discharges a part of the wastewater in the filtration area of the filter element module 300. Furthermore, the proportion of pure water in the filtration area of the filter element module 300 can be increased, and the proportion of wastewater can be reduced. When the user receives the first glass of water next time, the TDS is reduced, improving the quality and taste of the first glass of water and meeting the user's requirements for purified water.

[0058] Please refer to Figure 7 , Figure 10 and Figure 11, in one embodiment, the central tube 200 includes an inner tube body 210 and an outer tube body 220. The inner tube body 210 is located inside the outer tube body 220. The inner tube body 210 forms a pure water flow channel 200a, and a waste water flow channel 200b is formed between the inner tube body 210 and the outer tube body 220. Specifically, the central tube 200 includes the inner tube body 210 and the outer tube body 220 which are sleeved inside and outside. The outer tube body 220 is located outside the inner tube body 210, and there is a gap between the two. The pure water flow channel 200a is formed in the inner tube body 210, and the gap between the inner tube body 210 and the outer tube body 220 forms the waste water flow channel 200b. The central tube 200 is set in the form of the inner and outer tube bodies 220. On the one hand, it is convenient for the inner tube body 210 to be directly connected to the water outlet 120. On the other hand, the isolation effect of the two flow channels is good, ensuring that there is no cross-flow between them.

[0059] Please refer to Figure 7 , in one embodiment, the filter element assembly 300 includes a reverse osmosis filter element 310, and a first end cap 320 and a second end cap 330 respectively arranged at both ends of the reverse osmosis filter element 310. The reverse osmosis filter element 310 is sleeved on the outer tube body 220. The first end cap 320 is arranged on the side of the reverse osmosis filter element 310 away from the water inlet 110, and the second end cap 330 is arranged on the side of the reverse osmosis filter element 310 close to the water inlet 110; both the first end cap 320 and the second end cap 330 are adhesively bonded to the reverse osmosis filter element 310.

[0060] Specifically, the first filter element and the second filter element are used to fix the reverse osmosis filter element 310, and both the first end cap 320 and the second end cap 330 are adhesively bonded to the reverse osmosis filter element 310, avoiding the reverse osmosis filter element 310 from being deformed and displaced by the water pressure impact, and further extending the service life of the reverse osmosis filter element 310. The reverse osmosis filter element 310 is used to filter the raw water flowing into the housing 100.

[0061] Please refer to Figures 7 to 9, the reverse osmosis filter element 310 is arranged in an annular column shape, and its inner ring wall surface is sleeved on the outer wall surface of the central pipe 200. The reverse osmosis filter element 310 has a raw water inlet side 300a, a waste water outlet side 300b, and a pure water outlet side 300c. Among them, the raw water inlet side 300a is used to supply external water flow into the reverse osmosis filter element 310 for filtration. When the water flow flowing into the reverse osmosis filter element 310 is filtered, two paths of water are generated, one path of waste water and one path of pure water (i.e., the filtered water passing through the reverse osmosis filter element 310). The waste water flows out from the waste water outlet side 300b and flows through the waste water flow channel 200b to the waste water port 130, and the pure water flows from the pure water outlet side 300c to the pure water flow channel 200a, and after flowing out, it undergoes a post-filtration process or is directly supplied to users. In this embodiment, the pure water outlet side 300c of the reverse osmosis filter element 310 is the inner ring wall surface of the annular column-shaped reverse osmosis filter element 310, so that the pure water flowing out from the pure water outlet side 300c directly flows into the pure water flow channel 200a through the pure water through-hole 241; the raw water inlet side 300a of the reverse osmosis filter element 310 is the end face of the reverse osmosis filter element 310 close to the water inlet 110, and the waste water outlet side 300b is the end face of the other end of the reverse osmosis filter element 310 opposite to the raw water inlet side 300a.

[0062] Please refer to Figure 7 and Figure 8 , in an embodiment, the first end cap 320 is provided with a water flow channel 320a, and the pure water flow channel 200a and the water storage cavity 400 are communicated through the water flow channel 320a. Specifically, a water flow channel 320a is opened in the first end cap 320. The water flow channel 320a can be a through hole penetrating the first end cap 320, or a plurality of water passing channels opened along the circumferential direction of the first end cap 320, and no specific limitation is made thereto.

[0063] Please refer to Figure 8 , further, the first end cap 320 is provided with a slot 321 corresponding to the inner pipe body 210. The slot 321 is communicated with the water flow channel 320a. The inner pipe body 210 is inserted into the slot 321 and is hermetically connected to the slot 321. The slot 321 is used for the end of the inner pipe body 210 to be inserted to realize the communication between the pure water flow channel 200a and the water flow channel 320a. At the same time, the setting of the slot 321 can enable the inner pipe body 210 and the first end cap 320 to be plugged and matched, ensuring the stability of the connection between the two. A sealing ring structure can also be arranged in the slot 321 to seal between the inner pipe body 210 and the slot 321 to prevent the water in the pure water flow channel 200a from flowing astray. It should be noted that since the slot 321 is used for the inner pipe body 210 to be inserted, the slot 321 is opened at the central position of the first end cap 320. The slot 321 is generally a circular sunk groove, which is adapted to the shape and position of the inner pipe body 210.

[0064] Further, one end of the water passing channel 320a communicates with the pure water channel 200a, and the other end communicates with the water storage cavity 400. Moreover, the port of the end of the water passing channel 320a communicating with the water storage cavity 400 is arranged towards the side wall of the housing 100. Preferably, in this embodiment, the water passing channel 320a is a through hole formed in the first end cover 320, and this through hole does not penetrate the entire first end cover 320. That is, one end of the water passing channel 320a directly communicates with the slot 321, so as to realize the communication with the pure water channel 200a, the other end communicates with the water storage cavity 400, and the port of the end of the water passing channel 320a communicating with the water storage cavity 400 is arranged towards the side wall of the housing 100.

[0065] Please refer to Figure 8 , mainly considering that when the reverse osmosis filtration assembly 10 of the present application is in use, it is horizontally inserted into the corresponding device for use, that is, the reverse osmosis filtration assembly 10 is used horizontally. Since the density of the gas is low and it is hardly soluble in water, when the reverse osmosis filtration assembly 10 operates, the gas will remain in the upper part of the housing 100, that is, the upper part of the water storage cavity 400, and the filtered pure water will remain below the gas in the water storage cavity 400 due to the action of gravity, which can be understood as the lower part of the water storage cavity 400.

[0066] It should be noted that since the water storage cavity 400 is formed between the outer wall of the reverse osmosis filter element 310 and the inner wall of the filter bottle 140, it is actually an annular cavity in essence. The water storage cavity 400 includes an upper part and a lower part, and its upper part and lower part are communicating cavities. The division of the upper part and the lower part is mainly based on the position of the central tube 200 for a simple division, but it does not mean that the upper part and the lower part of the present utility model are only the parts on the relative two sides of the central tube 200. Considering that when the reverse osmosis filtration assembly 10 stops operating, there is a process of delayed shutdown to reach pressure balance in the whole water purification device. Therefore, at this time, the water flowing into the water storage cavity 400 will not only be stored in the lower part, but also part of the pure water will cross the central tube 200 and be stored in the upper part. There will always be gas remaining in the upper part, that is, above the central tube 200. When the gas is compressed and then the compressed gas returns to its original volume, the pure water in the water outlet channel will be pressured and pushed into the reverse osmosis filter element 310, and then the high-concentration wastewater in the reverse osmosis filter element 310 will be accurately discharged, thereby reducing the TDS value of the concentrated water in the reverse osmosis filter element 310 and achieving an ultra-high first glass of water effect, and avoiding the problem that the TDS value of the first few glasses of pure water is too high when the water purification device is restarted for use.

[0067] Please refer to Figure 3 , Figure 7 and Figure 9, in one embodiment, the reverse osmosis filter element 310 is arranged in an annular column shape, and a waterproof sealing layer is provided on the outer peripheral wall of the reverse osmosis filter element 310. With this arrangement, the water storage cavity 400 and the filtration area of the reverse osmosis filter element 310 are separated, preventing the raw water flowing into the reverse osmosis filter element 310 from directly flowing into the water storage cavity 400 and contaminating the pure water. Among them, the sealing layer can be formed by impregnating glass fiber yarn with resin and then winding it around the outer periphery of the reverse osmosis filter element 310. Finally, after the resin solidifies, it fills the gaps between the glass fiber yarns, enabling the sealing layer to isolate the reverse osmosis filter element 310 and the water storage cavity 400.

[0068] Please refer to Figure 9 and Figure 11 , in one embodiment, the inner tube body 210 and the outer tube body 220 are coaxially arranged. With this arrangement, the structure of the central tube 200 is symmetric, facilitating the production and manufacturing of the central tube 200, and also facilitating the cooperation between the central tube 200 and the filter element assembly 300.

[0069] Please refer to Figure 5 , Figure 6 and Figure 11 , in one embodiment, the outer wall surface of the end of the inner tube body 210 near the water outlet 120 is connected to the inner wall surface of the outer tube body 220 through an annular plug 230. A pure water buffer cavity 200c is formed between the annular plug 230 and the end face of the outer tube body 220. The pure water buffer cavity 200c is communicated with the pure water flow channel 200a, and the diameter of the pure water buffer cavity 200c is larger than the diameter of the pure water flow channel 200a.

[0070] Specifically, at the end of the central tube 200 near the water outlet 120, the length of the outer tube body 220 is greater than the length of the inner tube body 210. The outer wall surface of the inner tube body 210 and the inner wall surface of the outer tube body 220 are connected through an annular plug 230 to isolate the pure water flow channel 200a and the wastewater flow channel 200b, ensuring that the water in the two flow channels does not flow through each other and avoiding cross-contamination. Among them, the annular plug 230 is integrally formed with the inner tube body 210 and the outer tube body 220, which is convenient for manufacturing and eliminates the trouble of assembling the three, improving efficiency. A pure water buffer cavity 200c is formed between the annular plug 230 and the end face of the outer tube body 220. It can also be understood that a pure water buffer cavity 200c is formed between the end face of the inner tube body 210 and the end face of the outer tube body 220. The diameter of this pure water buffer cavity 200c is larger than the diameter of the pure water flow channel 200a. At the same flow rate, the water flow velocity in the slender pure water flow channel 200a is relatively fast, and the pure water buffer cavity 200c is located between the water outlet end of the pure water flow channel 200a and the water outlet 120, which can buffer the water flowing out of the pure water flow channel 200a.

[0071] Please refer to Figure 7 , Figure 10 and Figure 11, in an embodiment, a pure water inlet 241, a first waste water inlet 221, and a second waste water inlet 222 are formed on the outer tube body 220. The pure water outlet side 300c and the pure water flow channel 200a are connected through the pure water inlet 241. The first waste water inlet 221 connects the waste water outlet side 300b and the waste water flow channel 200b. The second waste water inlet 222 connects the waste water outlet 120 and the waste water flow channel 200b.

[0072] Specifically, the pure water filtered by the filter element assembly 300 flows into the pure water flow channel 200a through the pure water inlet 241 and is discharged from the water outlet 120. The waste water filtered by the filter element assembly 300 first flows into the waste water flow channel 200b through the first waste water inlet 221, and then flows out of the waste water flow channel 200b from the second waste water outlet 130 and is discharged to the waste water outlet 130.

[0073] Please refer to Figure 10 and Figure 11 , it is worth mentioning that the central tube 200 is further provided with a connecting tube 240. The connecting tube 240 penetrates through the side wall of the outer tube body 220 and is connected to the pure water flow channel 200a formed in the inner tube body 210. The two end ports of the connecting tube 240 form the pure water inlet 241. That is to say, the central tube 200 is provided with a connecting tube 240 penetrating through the side wall of the outer tube body 220. Since the pure water flow channel 200a is formed in the inner tube body 210 and the inner tube body 210 is located inside the outer tube body 220, the connecting tube 240 penetrates through the opposite side walls of the outer tube body 220 and passes through the inner tube body 210. The inside of the connecting tube 240 is connected to the pure water flow channel 200a and is isolated from the waste water flow channel 200b. The opposite ends of the connecting tube 240, that is, the two openings formed by penetrating through the side wall of the outer tube body 220, are the pure water inlets 241 connecting the pure water flow channel 200a and the pure water outlet side 300c of the filter element assembly 300, and the pure water inlets 241 are symmetrically arranged on the opposite sides of the outer tube body 220.

[0074] Please refer to Figure 7 , Figure 10 and Figure 11, Further, there are multiple connecting pipes 240, and the multiple connecting pipes 240 are arranged at intervals along the axial direction of the central pipe 200. That is, the number of pure water through-holes 241 is multiple, and the multiple pure water through-holes 241 are arranged at intervals along the axial direction of the central pipe 200. The pure water outlet side 300c of the filter element assembly 300 and the pure water flow channels 200a are connected through the multiple pure water through-holes 241, further ensuring the flow rate of pure water and realizing large flux. The number of the connecting pipes 240 is, for example, 5, 6, 7, 8, 9 or 10, and correspondingly, the number of the pure water through-holes 241 is twice the number of the connecting pipes 240. It should be noted that the central pipe 200 is arranged inside the filter element assembly 300 and has the function of supporting the inside of the filter element assembly 300, preventing the filter element assembly 300 from deforming due to large water pressure, and thus ensuring the smooth water outlet path of the filter element assembly 300.

[0075] Please refer to Figure 11 , In an embodiment, the length of the central pipe 200 is set to L1, and the distance between the pure water through-hole 241 close to the first waste water through-hole 221 and the first waste water through-hole 221 is set to L2, satisfying 0.25 ≤ L2 / L1 ≤ 0.4. Specifically, the central pipe 200 is a long pipe with a certain length. Since the first waste water through-hole 221 is used for the waste water generated after passing through the filter element assembly 300 to flow in and flow into the waste water flow channel 200b, and according to the filtering principle of the filtering assembly, inside the filtering assembly, as the water path goes, pure water will sequentially flow into the pure water flow channels 200a through the pure water through-holes 241, and the concentration of the waste water will become higher and higher (i.e., the TDS value becomes higher and higher). Therefore, the closer the water flow of the first waste water through-hole 221 to the waste water outlet side 300b of the filter element assembly 300 is, the higher its water flow concentration is. Therefore, the distance between the pure water through-hole 241 close to the first waste water through-hole 221 and the first waste water through-hole 221 is set to L2, the overall length of the central pipe 200 is set to L1, and the ratio of L2 to L1 is limited between 0.25 and 0.4 to ensure that the waste water close to the first waste water through-hole 221 will not flow into the pure water flow channels 200a through the pure water through-holes 241 and pollute the pure water.

[0076] Please refer to Figure 10 and Figure 11, in one embodiment, the first waste water inlet 221 is a water passing notch opened at one end of the outer pipe body 220; the second waste water inlet 222 is opened at the other end of the outer pipe body 220 and is arranged close to the waste water outlet 130. Specifically, the first waste water inlet 221 is a water passing notch opened at the end of the outer pipe body 220, and the water passing notch can be set as an arc-shaped notch. The second waste water outlet 130 is opened at the other end of the outer pipe body 220 opposite to the first waste water outlet 130, that is, the end close to the waste water outlet 130. Setting the first waste water inlet 221 as a water passing notch facilitates the collection of waste water, and the waste water flows through the waste water flow channel 200b and flows out from the second waste water inlet 222.

[0077] Please refer to Figure 5 , Figure 10 and Figure 11 , it is worth mentioning that the raw water inlet side 300a and the waste water outlet side 300b of the filter element assembly 300 can be set as two opposite end faces of the filter element assembly 300 along its length direction. The water passing notch is directly communicated with the waste water outlet side 300b, and the opening of the water passing notch abuts against the housing 100 or other structures to facilitate the collection of waste water.

[0078] Please refer to Figure 5 and Figure 6 , in one embodiment, the central pipe 200 passes through the second end cover 330 and is hermetically connected to the second end cover 330 and the housing 100; the second end cover 330 is hermetically connected to the housing 100 and forms a separated first chamber 331 and second chamber 332. The first chamber 331 is communicated with the raw water inlet side 300a and the water inlet 110, and the second chamber 332 is communicated with the waste water flow channel 200b and the waste water outlet 130.

[0079] Specifically, the central pipe 200 is hermetically connected to the second end cover 330 through a sealing ring to ensure the stability of the connection of the central pipe 200 and avoid the cross-flow of pure water and waste water. At the same time, the mutually separated first chamber 331 and second chamber 332, where the first chamber 331 is used for raw water inlet and the second chamber 332 is used for waste water outflow, realizing the mutual isolation of the raw water water path and the waste water water path. Moreover, after the central pipe 200 passes through the second end cover 330, it is hermetically connected to the housing 100, that is, the pure water flow channel 200a formed in the central pipe 200 is directly communicated with the water outlet 120 on the housing 100, realizing the isolation of the raw water water path, the waste water water path and the pure water water path in the housing 100, and the three water paths do not affect each other and do not interfere with each other.

[0080] Please refer to Figure 6, regarding the positions of the first chamber 331 and the second chamber 332, the second chamber 332 is located inside the first chamber 331. The first chamber 331 and the second chamber 332 are respectively arranged corresponding to the raw water inlet side 300a of the filter element assembly 300 and the water outlet end of the waste water flow channel 200b. Therefore, the second chamber 332 is arranged inside the first chamber 331.

[0081] Please refer to Figure 7 , in an embodiment, the central tube 200 and the filter element assembly 300 are coaxially arranged. The coaxiality of the central tube 200 and the filter element assembly 300 is ensured, thereby improving the stability of the internal water path system of the filter element, enhancing the water flow efficiency, and facilitating production and manufacturing.

[0082] In an embodiment, the gas in the water storage chamber 400 is air, nitrogen or inert gas. As described above, there is a gas insoluble in water in the water storage chamber 400. The gas can be air, nitrogen or inert gas (extremely difficult to dissolve in water and difficult to be carried away by water flow), or other gases difficult to dissolve in water. There is no specific limitation on this. When the gas is air, since it is not necessary to evacuate the inside of the housing 100 after the filter element assembly 300 is assembled, the air directly exists in the pure water flow channel 200a and the water storage chamber 400 communicated with the pure water flow channel 200a; when the gas is nitrogen or inert gas, the inside of the housing 100 can be evacuated after the filter element assembly 300 is assembled, and then the required nitrogen, inert gas or other gases are filled into the water outlet flow channel.

[0083] The water inlet 110, water outlet 120 and waste water outlet 130 of the reverse osmosis filtration assembly 10 of the present application are all arranged on the same side of the housing 100. The reverse osmosis filter element 310 of the filter element assembly 300 is arranged in an annular column shape. Its raw water inlet side 300a is the end face of the reverse osmosis filter element 310 close to the water inlet 110, the waste water outlet side 300b is the other end face of the reverse osmosis filter element 310 opposite to the raw water inlet side 300a, and the pure water outlet side 300c is the inner annular wall surface of the annular column-shaped reverse osmosis filter element 310. The specific flow path of the entire reverse osmosis filtration assembly 10 is as follows:

[0084] Please refer to Figure 12 and Figure 13, water flows into the housing 100 from the water inlet 110 under the pressure boosting effect of the booster pump, and flows through the raw water inlet side 300a for filtration. After being filtered by the reverse osmosis filter element 310, two paths of water are generated, one path of wastewater and one path of pure water (i.e., the purified water after being filtered by the reverse osmosis filter element 310). Among them, the wastewater first flows out through the wastewater outlet side 300b, then flows into the wastewater flow channel 200b through the first wastewater through-hole 221, and then flows out of the wastewater flow channel 200b through the second wastewater through-hole 222, and finally is discharged from the wastewater outlet 130; the pure water first flows out through the pure water outlet side 300c, and flows into the pure water flow channel 200a through the pure water through-hole 241. At this time, it should be noted that the pure water flowing into the pure water flow channel 200a is further divided into two paths. One path of pure water directly flows out from the water outlet 120 for direct drinking by users or flows into the next filtration module for re-filtration, and the other path of pure water flows into the water storage cavity 400 through the water flow channel 320a to increase the amount of pure water in the entire housing 100.

[0085] The present utility model also provides a water purification device, which includes the aforementioned reverse osmosis filtration assembly 10. The specific structure of the reverse osmosis filtration assembly 10 refers to the above-mentioned embodiments. Since this water purification device adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one. Among them, the water purification device is any one of a water dispenser, a drinking fountain or a pure water machine.

[0086] The reverse osmosis filtration assembly 10 of the present application is used for a water purification device. In addition to the reverse osmosis filtration assembly 10, a pre-filter assembly 300 can also be provided upstream of the water inlet 110, that is, the water entering the water inlet 110 is filtered by the pre-filter. When the pre-filter filters, the pre-filter will adsorb larger particulate impurities in the water and preliminarily filter the raw water, and then filter out most of the salt ions in the water through the filter membrane of the reverse osmosis filter element 310. In addition, a post-filter assembly 300 can also be provided at the rear end of the reverse osmosis filtration assembly 10, that is, the filtered water after being filtered by the reverse osmosis filtration assembly 10 is filtered by the post-filter to remove color and adjust the taste, and then flows into the user end from the faucet.

[0087] In this embodiment, the reverse osmosis filter element 310 is integrally arranged in the housing 100. Of course, in other embodiments, the pre-filter assembly 300, the post-filter assembly 300 and the reverse osmosis filtration assembly 10 can also be integrally integrated in the same housing 100, or the pre-filter assembly 300 and the post-filter assembly 300 can be integrated in the same housing 100, and no specific limitation is made thereto.

[0088] The technical solution of the present utility model adopts a central pipe 200 which is respectively formed with an independent pure water flow channel 200a and a waste water flow channel 200b. After being filtered by the filter element assembly 300, a path of waste water and a path of pure water are directly discharged through the waste water flow channel 200b and the pure water flow channel 200a in the central pipe 200 respectively, without the need for the filter element assembly 300 itself to effectively separate the pure water and the waste water, simplifying the internal flow channel structure of the filter element assembly 300, and the waste water flow channel 200b and the pure water flow channel 200a do not interfere with each other, avoiding the cross-contamination of waste water and pure water. At the same time, a gas is filled in the water storage cavity 400. When the reverse osmosis filtration assembly 10 stops operating, the gas in the water storage cavity 400 is first compressed. When the pressure is balanced, the compressed gas in the water storage cavity 400 begins to return to its original volume, and the pressure is released through the water from the central pipe 200 to the reverse osmosis filter element 310, thereby pressing the pure water in the pure water flow channel 200a and the water storage cavity 400 into the filtration area of the filter element assembly 300. And at this time, the waste water outlet 130 is in an open state, and the high-concentration waste water in the filtration area of the filter element assembly 300 can be accurately discharged, thereby reducing the TDS value of the concentrated water in the filtration area of the filter element assembly 300, achieving an ultra-high first glass of water effect, and avoiding the problem that the TDS value of the first few glasses of pure water is too high when the water purification device is restarted for use.

[0089] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A reverse osmosis filtration component, characterized in that: include: The shell is provided with a water inlet, a water outlet and a wastewater outlet; a central tube, disposed in the shell and having a pure water flow channel connected to the water outlet and a waste water flow channel connected to the waste water outlet; and A filter element assembly is arranged in the housing and sleeved with the central tube; the filter element assembly has a raw water inlet side, a waste water outlet side and a pure water outlet side, the raw water inlet side is connected to the water inlet, the waste water outlet side is connected to the waste water flow channel, and the pure water outlet side is connected to the pure water flow channel; Wherein, a water storage cavity is formed between the filter element assembly and the shell, the water storage cavity is communicated with the pure water flow channel, and there is gas in the water storage cavity.

2. The reverse osmosis filtration assembly according to claim 1, characterized in that The central tube comprises an inner tube body and an outer tube body, wherein the inner tube body is located inside the outer tube body, the inner tube body forms the pure water flow channel, and the waste water flow channel is formed between the inner tube body and the outer tube body.

3. The reverse osmosis filtration assembly according to claim 2, characterized in that: The filter element assembly includes a reverse osmosis filter element, and a first end cap and a second end cap respectively arranged at both ends of the reverse osmosis filter element. The reverse osmosis filter element is sleeved with the outer tube body, the first end cap is arranged on a side of the reverse osmosis filter element away from the water inlet, and the second end cap is arranged on a side of the reverse osmosis filter element close to the water inlet; the first end cap and the second end cap are both glued to the reverse osmosis filter element.

4. The reverse osmosis filtration assembly according to claim 3, characterized in that: The first end cover is provided with a water flow channel, and the pure water flow channel and the water storage chamber are communicated through the water flow channel.

5. The reverse osmosis filtration assembly according to claim 4, characterized in that: The first end cover is provided with a slot corresponding to the inner tube body, the slot is communicated with the water flow channel, and the inner tube body is inserted into the slot and sealedly connected with the slot.

6. The reverse osmosis filtration assembly according to claim 4, characterized in that: One end of the water flow channel is communicated with the pure water flow channel, and the other end is communicated with the water storage cavity, and the port of the end of the water flow channel communicating with the water storage cavity is arranged toward the side wall of the shell.

7. The reverse osmosis filtration assembly according to claim 3, characterized in that: The reverse osmosis filter element is arranged in an annular column shape, and a waterproof sealing layer is arranged on the outer peripheral wall of the reverse osmosis filter element.

8. The reverse osmosis filtration assembly according to claim 2, characterized in that: The inner tube body and the outer tube body are coaxially arranged.

9. The reverse osmosis filtration assembly according to claim 2, characterized in that: The outer wall surface of the end of the inner tube body close to the water outlet is connected to the inner wall surface of the outer tube body through an annular plug, and a pure water buffer chamber is formed between the annular plug and the end surface of the end of the outer tube body. The pure water buffer chamber is connected to the pure water flow channel, and the diameter of the pure water buffer chamber is larger than the diameter of the pure water flow channel.

10. The reverse osmosis filtration assembly according to claim 2, characterized in that: The outer tube body is provided with a pure water inlet, a first waste water inlet and a second waste water inlet. The pure water outlet side and the pure water flow channel are connected through the pure water inlet, the first waste water inlet connects the waste water outlet side and the waste water flow channel, and the second waste water inlet connects the waste water outlet and the waste water flow channel.

11. The reverse osmosis filtration assembly according to claim 10, characterized in that: The central tube is also provided with a connecting tube, which passes through the side wall of the outer tube body and is connected with the pure water flow channel formed in the inner tube body, and the two end ports of the connecting tube form the pure water outlet.

12. The reverse osmosis filtration assembly according to claim 11, characterized in that There are a plurality of connecting pipes, and the connecting pipes are arranged at intervals along the axial direction of the central pipe.

13. The reverse osmosis filtration assembly according to claim 10, characterized in that: The first wastewater outlet is a water-passing notch opened at one end of the outer tube body; the second wastewater outlet is opened at the other end of the outer tube body and is arranged close to the wastewater outlet.

14. The reverse osmosis filtration assembly according to claim 3, characterized in that: The central tube passes through the second end cover and is sealed with the second end cover and the shell; the second end cover is sealed with the shell to form a first chamber and a second chamber that are isolated from each other, the first chamber is connected to the raw water inlet side and the water inlet, and the second chamber is connected to the wastewater flow channel and the wastewater outlet.

15. The reverse osmosis filtration assembly according to any one of claims 1 to 14, characterized in that: The gas in the water storage cavity is air, nitrogen or inert gas.

16. A water purification device, characterized in that: Comprising the reverse osmosis filtration component according to any one of claims 1 to 15.

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