Reverse osmosis filter element and water purification equipment

Abstract

The present invention discloses a reverse osmosis filter element and water purification equipment. The reverse osmosis filter element comprises: a central tube, the peripheral wall of which is provided with pure water holes; a reverse osmosis membrane wound around the outer circumference of the central tube; a water storage element, the water storage element having a water inlet, a water outlet, and a water storage cavity connecting the water inlet and the water outlet; the water storage element is disposed within the central tube, the water inlet is connected to the tube cavity of the central tube, and the water outlet is connected to the water outlet end of the central tube; and a one-way conduction device is disposed at the water inlet and is conducted toward the water storage cavity. The reverse osmosis filter element of the present invention reduces the soluble impurity content of the first cup of water, improves the purity of the first cup of water during water production, and thus improves the practicality of the water purification system.

Description

Technical Field

[0001] The present invention relates to the field of water purification equipment, and in particular to a reverse osmosis filter element and water purification equipment. Background Art

[0002] Existing water purification equipment mainly relies on membrane filter elements to filter raw water. However, when the water purification equipment is in standby mode, raw water, wastewater and pure water will coexist in the membrane filter element. The raw water and wastewater are both in front of the membrane of the membrane filter element, and the pure water is behind the membrane of the membrane filter element. In addition, the TDS values ​​of the raw water and wastewater are much higher than the TDS value of the pure water. If the water purification equipment is in standby mode for a long time, the ions in the raw water and wastewater in the membrane filter element will diffuse into the pure water, thereby increasing the TDS value of the pure water. When the water purification equipment is turned on to produce pure water next time, the TDS value of the first cup of pure water produced will be relatively high, affecting the user experience. Summary of the Invention

[0003] The main purpose of the present invention is to provide a reverse osmosis filter element, aiming to solve the technical problem of how to improve the purity of the first cup of water in a water purification device.

[0004] To achieve the above-mentioned purpose, the reverse osmosis filter element proposed by the present invention comprises:

[0005] A central tube, wherein a pure water hole is opened on the peripheral wall of the central tube;

[0006] A reverse osmosis membrane is wound around the outer circumference of the central tube;

[0007] A water storage member, the water storage member is provided with a water inlet, a water outlet, and a water storage cavity communicating with the water inlet and the water outlet; the water storage member is arranged in the central tube, the water inlet is communicated with the tube cavity of the central tube, and the water outlet is communicated with the water outlet end of the central tube;

[0008] A one-way conducting device is provided at the water inlet, and the one-way conducting device is conducted toward the water storage chamber.

[0009] Preferably, the water storage member is cylindrically arranged extending along the axial direction of the central tube, the water inlet and the water outlet are formed at both ends of the water storage member, and a water gap connected to the pure water hole is formed between the water storage member and the central tube.

[0010] Preferably, one end of the central tube corresponding to the water inlet is closed, and one end of the central tube corresponding to the water outlet is sealed with the water storage component.

[0011] Preferably, the inner wall of the closed end of the central tube is provided with a support rib extending in the axial direction, and the support rib abuts against the water inlet end of the water storage component.

[0012] Preferably, an outer wall of the water storage member is provided with abutment ribs, and the abutment ribs abut against the inner wall of the central tube.

[0013] Preferably, there are multiple abutment ribs, and the multiple abutment ribs are arranged at intervals along the circumference of the water storage component.

[0014] Preferably, a guiding slope is formed on the side of the abutting rib facing the water inlet end of the water storage component.

[0015] Preferably, the abutting ribs include a first abutting rib adjacent to the water inlet and a second abutting rib adjacent to the water outlet.

[0016] Preferably, an outer wall of the water storage member adjacent to one end of the water outlet is provided with a reinforcing rib extending along the circumference of the outer wall of the water storage member.

[0017] Preferably, an abutment rib is protruding from the outer wall of the water storage member, and a free end of the abutment rib protrudes from the reinforcing rib and abuts against the inner wall of the central tube.

[0018] Preferably, the one-way conduction device includes a one-way valve.

[0019] Preferably, the one-way valve includes a valve body, a valve core and a reset member; the valve body is sealed with the water inlet, and the valve body is provided with a water inlet hole, a water outlet hole, and a water passage connecting the water inlet hole and the water outlet hole; the valve core is movably arranged in the water passage to block or open the water inlet hole under the action of the reset member or water flow.

[0020] Preferably, a support member is provided at the water outlet end of the valve body, and the reset member is an elastic member, one end of the elastic member abuts against the support member, and the other end abuts against the valve core.

[0021] Preferably, the support member includes a limiting cylinder and a connecting rib connecting the limiting cylinder and the valve body, the valve core includes a water retaining portion and a limiting portion, the limiting portion slides with the limiting cylinder, the elastic member is sleeved on the limiting cylinder, and one end of the elastic member abuts the connecting rib, and the other end abuts the limiting portion.

[0022] The present invention also proposes a water purification device, including a reverse osmosis filter element, which includes: a central tube, a peripheral wall of which is provided with pure water holes; a reverse osmosis membrane, which is wound around the outer circumference of the central tube; a water storage component, which is provided with a water inlet, a water outlet and a water storage cavity connecting the water inlet and the water outlet; the water storage component is arranged in the central tube, the water inlet is connected to the tube cavity of the central tube, and the water outlet is connected to the water outlet end of the central tube; a one-way conduction device, which is arranged at the water inlet, and the one-way conduction device is conducted toward the water storage cavity.

[0023] The reverse osmosis filter element of the present invention provides a water storage component in the central tube and a one-way conduction device at the water inlet of the water storage component, so that the water in the water storage component will no longer flow back to the central tube, that is, the water in the water storage component will no longer exchange ions with the water in the central tube. Therefore, when the water purification equipment is shut down, even if the ions in the raw water diffuse into the central tube, they cannot enter the water storage component; since after the water purification equipment is turned on again, the first cup of water obtained by the user, that is, the water in the water storage component is still pure water, the soluble impurity content of the first cup of water is reduced, and the purity of the first cup of water during water production is improved, thereby improving the practicality of the water purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 This is a schematic structural diagram of an embodiment of a reverse osmosis filter element of the present invention;

[0026] Figure 2 Schematic cross-sectional view of an embodiment of a reverse osmosis filter element of the present invention;

[0027] Figure 3 is a cross-sectional schematic diagram of another embodiment of the reverse osmosis filter element of the present invention;

[0028] Figure 4 for Figure 3 A partial enlarged view of point A in the middle;

[0029] Figure 5 Schematic cross-sectional view of another embodiment of the reverse osmosis filter element of the present invention;

[0030] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0031] Description of Figure Numbers:

[0032]

[0033] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The invention provides a reverse osmosis filter element.

[0038] In the embodiment of the present invention, Figures 1 to 4 As shown, the reverse osmosis filter element includes:

[0039] A central tube 10, wherein a pure water hole 11 is opened on the peripheral wall of the central tube 10;

[0040] The reverse osmosis membrane 20 is wound around the outer circumference of the central tube 10;

[0041] A water storage member 30 is provided with a water inlet 31, a water outlet 32, and a water storage cavity 33 communicating with the water inlet 31 and the water outlet 32; the water storage member 30 is disposed within the central tube 10, the water inlet 31 communicates with the lumen of the central tube 10, and the water outlet 32 ​​communicates with the water outlet end of the central tube 10;

[0042] The one-way conducting device 40 is disposed at the water inlet 31 , and the one-way conducting device 40 is connected to the water storage chamber 33 .

[0043] In this embodiment, the reverse osmosis membrane 20 is wound around the central tube 10 to form a reverse osmosis unit. The reverse osmosis unit has a raw water flow channel and a pure water flow channel. The pure water flow channel is connected to the pure water hole 11 of the central tube 10 so that the pure water after osmosis flows into the tube cavity of the central tube 10. The reverse osmosis filter element also includes a shell. The reverse osmosis unit and the central tube 10 are both installed in the shell. The shell is provided with a raw water inlet connected to the water inlet end of the raw water flow channel, a pure water outlet connected to the water outlet end of the central tube 10, and a waste water outlet connected to the water outlet end of the raw water flow channel. The shape of the water storage part 30 can be cylindrical or spherical, and there is no restriction here. It is sufficient that the water storage part 30 is located in the tube cavity of the central tube 10. Water entering the central tube 10 will first enter the water storage chamber 33 and then flow out of the central tube 10 through the water outlet 32. It is understood that during the process of pure water flowing out of the central tube 10 from the water storage chamber 33, it will no longer exchange ions with the water in the central tube 10. Furthermore, water flowing into the central tube 10 can only enter the water storage chamber 33 before flowing out of the central tube 10. The one-way conduction device 40 can be a one-way valve or other conducting structure, as long as it ensures that water can only flow into the water storage chamber 33 from the water inlet 31 and cannot flow out. When the water purification equipment is shut down, ions in the wastewater channel will diffuse into the pure water channel and further into the central tube 10. Because the water inlet 31 of the water storage component 30 is equipped with the one-way conduction device 40, the water in the water storage chamber 33 will no longer exchange ions with the water in the central tube 10. Furthermore, after the equipment is shut down, the water in the water storage chamber 33 will no longer be drawn from, i.e., the water will fill the water storage chamber 33. As a result, the water in the central tube 10 will not be able to enter the water storage chamber 33 after the equipment is shut down, and ions will not be able to diffuse into the water storage chamber 33 after the equipment is shut down. Therefore, when the water purification device is operated again, the first cup of water obtained by the user from the water storage chamber 33 will not contain ions and will have a higher degree of cleanliness.

[0044] The reverse osmosis filter element of the present invention provides a water storage member 30 in the central tube 10 and a one-way conduction device 40 at the water inlet 31 of the water storage member 30, so that the water in the water storage member 30 will no longer flow back to the central tube 10, that is, the water in the water storage member 30 will no longer exchange ions with the water in the central tube 10. Therefore, when the water purification equipment is shut down, even if the ions in the raw water diffuse into the central tube 10, they cannot enter the water storage member 30; because after the water purification equipment is turned on again, the first cup of water obtained by the user, that is, the water in the water storage member 30, is still pure water, the soluble impurity content of the first cup of water is reduced, and the purity of the first cup of water during water production is improved, thereby improving the practicality of the water purification system.

[0045] Specifically, if Figures 1 to 4As shown, the water storage member 30 is cylindrical and extends axially along the central tube 10. The water inlet 31 and the water outlet 32 ​​are formed at either end of the water storage member 30. A water flow gap 12 is formed between the water storage member 30 and the central tube 10, communicating with the pure water hole 11. In this embodiment, the dimensions of the water storage member 30 are adapted to the central tube 10, requiring only that the volume of the water storage chamber 33 be maximized and that the water flow gap 12 be formed between the outer wall of the water storage member 30 and the water inlet 31 and the inner wall of the central tube 10, allowing pure water to flow. After entering the central tube 10 from the pure water hole 11, pure water flows along the water flow gap 12 to the water inlet 31 of the water storage member 30, ultimately flowing into the water storage chamber 33 through the one-way guide device 40. Since the water storage component 30 is cylindrical in shape corresponding to the central tube 10, the size of the water storage component 30 can be maximized, that is, the volume of the water storage chamber 33 can be maximized, and the volume of the water gap 12 can be minimized; thus, after the water purification equipment is shut down, the amount of water contaminated by ions in the central tube 10 will be less. After the water purification equipment is operated again, although the contaminated water will continue to enter the water storage component 30, due to the smaller amount, the impact on the pure water in the water storage chamber 33 is also smaller, and it will be effectively diluted by the pure water, thereby reducing the overall ion content of the first few cups of water after the water purification equipment is operated again, improving the cleanliness of the first few cups of water, and improving the overall practicality of the reverse osmosis filter element.

[0046] In practical applications, such as Figures 2 to 4 As shown, the end of the central tube 10 corresponding to the water inlet 31 is closed, and the end of the central tube 10 corresponding to the water outlet 32 ​​is sealed with the water storage member 30. In this embodiment, a certain distance is provided between the closed end of the central tube 10 and the water inlet 31 to ensure that pure water flowing through the water gap 12 can flow smoothly into the water storage chamber 33. One end of the central tube 10 forms a water outlet corresponding to the water outlet 32. The outer wall of the water outlet is provided with a circumferentially extending sealing groove, which is embedded with a sealing ring to achieve a sealed fit between the central tube 10 and the water storage member 30.

[0047] In one embodiment, if Figure 3 and Figure 4 As shown, the inner wall of the closed end of the central tube 10 is provided with axially extending support ribs 13, which abut the water inlet end of the water storage member 30. In this embodiment, the support ribs 13 are provided protruding from the inner circumferential wall of the central tube 10. One end of the support rib 13 is connected to the end wall of the closed end of the central tube 10, and the other end abuts the water inlet end of the water storage member 30. This effectively supports the water storage member 30, ensuring that the water storage member 30 is securely installed within the central tube 10 while maintaining the spacing between the central tube 10 and the water inlet end of the water storage member 30. In actual application, multiple support ribs 13 are provided and spaced apart along the circumference of the central tube 10 to increase the support area for the water storage member 30 and further enhance the installation stability of the water storage member 30.

[0048] In another embodiment, Figure 2 As shown, the outer wall of the water storage member 30 is provided with abutment ribs 34, which abut against the inner wall of the central tube 10. In this embodiment, the abutment ribs 34 effectively form a water-passing gap 12 between the outer wall of the water storage member 30 and the inner wall of the central tube 10, preventing the outer wall of the water storage member 30 from directly abutting the central tube 10 and thereby clogging the pure water holes 11. This improves the operational stability of the reverse osmosis filter element.

[0049] Specifically, the number of the abutment ribs 34 is multiple, and the multiple abutment ribs 34 are arranged at intervals along the circumference of the water storage member 30. In this embodiment, the multiple abutment ribs 34 are arranged at intervals along the circumference of the water storage member 30, and the pure water holes 11 are arranged at intervals along the circumference of the central tube 10, so that the water flow gap 12 can also extend along the circumference of the water storage member 30, so that multiple positions along the circumference of the central tube 10 can effectively inlet water, thereby improving the water inlet efficiency of pure water and thus improving the overall working efficiency of the reverse osmosis filter element. In actual application, the abutment ribs 34 include a first abutment rib 342 adjacent to the water inlet 31, and a second abutment rib 343 adjacent to the water outlet 32. By making the first abutment rib 342 and the second abutment rib 343 abut against the central tube 10, the water flow gap 12 can be formed between the entire water storage member 30 and the central tube 10, thereby improving the water purification efficiency.

[0050] Because one end of the central tube 10 is closed, the water storage member 30 is typically installed from the outlet end of the central tube 10, with the inlet end of the water storage member 30 first installed. However, the abutment rib 34 may increase the difficulty of inserting the water storage member 30 into the central tube 10. Therefore, a guide slope 341 is formed on the side of the abutment rib 34 facing the inlet end of the water storage member 30. This guide slope 341 allows the abutment rib 34 to more smoothly enter the port at the outlet end of the central tube 10, making installation of the water storage member 30 easier and more convenient. The width of the abutment rib 34 decreases from the fixed end toward the contact end to reduce the contact area between the abutment rib 34 and the central tube 10, thereby reducing friction between the abutment rib 34 and the central tube 10 during installation and further simplifying installation.

[0051] In one embodiment, if Figures 2 to 4As shown, the outer wall of the water storage member 30, adjacent to the water outlet 32, is provided with a convex reinforcing rib 35 extending circumferentially along the outer wall of the water storage member 30. In this embodiment, to minimize the impact of the wall thickness of the water storage member 30 on the volume of the water storage chamber 33, the wall thickness of the water storage member 30 is minimized. However, the water storage member 30 is exposed to high water pressure during operation of the water purification system. To prevent damage to the water storage member 30 from high water pressure, the water storage member 30's pressure resistance should be enhanced. The reinforcing rib 35 effectively increases the structural strength of the water storage member 30, thereby enhancing its pressure resistance. To prevent the reinforcing rib 35 from obstructing the flow of pure water, the reinforcing rib 35 can be positioned at the outlet end of the water storage member 30, thereby reducing the space occupied by the reinforcing rib 35 in the water flow gap 12. In practical applications, the number of reinforcing ribs 35 can be multiple and spaced axially along the water storage member 30. In addition, the reinforcing rib 35 may be provided with a water-passing gap extending through the axial direction to increase the flow of pure water in the water-passing gap 12 .

[0052] In combination with the above-mentioned embodiment of the abutting rib 34, it can be understood that the free end of the abutting rib 34 should protrude from the reinforcing rib 35 and abut against the inner wall of the central tube 10, so that a water gap 12 can be formed between the reinforcing rib 35 and the central tube 10 to increase the pure water flow rate.

[0053] In one embodiment, if Figure 4 and Figure 6 As shown, the one-way conduction device includes a one-way valve, which includes a valve body 41, a valve core 42, and a reset member 43. The valve body 41 is sealed with the water inlet and is provided with a water inlet hole 411, a water outlet hole 412, and a water passage 413 connecting the water inlet hole 411 and the water outlet hole 412. The valve core 42 is movably disposed within the water passage 413 to block or open the water inlet hole 411 under the action of the reset member 43 or water flow. In this embodiment, the water inlet of the water storage member is cylindrical, and the valve body 41 is sealed with the water inlet via a sealing ring. The valve core 42 can move along the axial direction of the valve body 41. The valve core 42 has a conducting position and a blocking position on its moving trajectory. When the valve core 42 is affected by the water flow outside the water inlet hole 411, the valve core 42 moves to the conducting position to open the water inlet. When the valve core 42 is not affected by the water flow outside the water inlet hole 411, the valve core 42 moves to the blocking position under the action of the reset member 43 to close the water inlet. As a result, the water flow can only push the valve core 42 in one direction to enter the water passage 413, thereby realizing that the water flow can only enter the water storage component in one direction.

[0054] Specifically, the water outlet end of the valve body 41 is provided with a support member 44. The return member 43 is an elastic member, one end of which abuts the support member 44 and the other end abuts the valve core 42. In this embodiment, when water flows from the outside, the valve core 42 compresses the elastic member, which then has elastic potential energy to restore its original shape. When the water flow decreases, the elastic member pushes the valve core 42 back to its original shape, causing the valve core 42 to move in the opposite direction to block the water inlet hole 411. A stop ring is protruding from the inner wall of the water inlet hole 411, and the valve core 42 can seal against the stop ring via a sealing ring.

[0055] In actual application, the support member 44 includes a limiting cylinder 441 and a connecting rib 442 connecting the limiting cylinder 441 and the valve body 41. The valve core 42 includes a water retaining portion 421 and a limiting portion 422. The limiting portion 422 slides with the limiting cylinder 441. The elastic member is sleeved on the limiting cylinder 441, with one end of the elastic member abutting the connecting rib 442 and the other end abutting the limiting portion 422. In this embodiment, the support member 44 also includes an interlocking cylinder extending along the circumference of the limiting cylinder 441. The connecting rib 442 connects the limiting cylinder 441 and the interlocking cylinder. The interlocking cylinder is embedded in the valve body 41 through the water outlet 412 and fixedly engaged with the valve body 41. The limiting portion 422 slides with the limiting cylinder 441 to prevent the valve core 42 from deviating from its motion trajectory, thereby improving the stability of the one-way valve.

[0056] The present invention also proposes a water purification device, which includes a reverse osmosis filter element. The specific structure of the reverse osmosis filter element refers to the above embodiment. Since this water purification device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present description and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A reverse osmosis filter element, characterized in that: include: A central tube, wherein a pure water hole is opened on the peripheral wall of the central tube; A reverse osmosis membrane is wound around the outer circumference of the central tube; A water storage member, the water storage member is provided with a water inlet, a water outlet, and a water storage cavity communicating with the water inlet and the water outlet; the water storage member is arranged in the central tube, the water inlet is communicated with the tube cavity of the central tube, and the water outlet is communicated with the water outlet end of the central tube; A one-way conducting device is provided at the water inlet, and the one-way conducting device is conducted toward the water storage chamber; The water storage member is cylindrical and extends along the axial direction of the central tube. The water inlet and the water outlet are formed at both ends of the water storage member. A water gap is formed between the outer wall of the water storage member and the inner wall of the central tube, and between the water inlet and the inner wall of the central tube, and is connected to the pure water hole to allow pure water to flow. The size of the water storage member is adapted to the central tube. The outer wall of the water storage component is provided with abutment ribs, which abut against the inner wall of the central tube. A guide slope is formed on the side of the abutment rib facing the water inlet end of the water storage component. The water storage component is installed into the central tube from the water outlet end of the central tube.

2. The reverse osmosis filter element according to claim 1, wherein: One end of the central tube corresponding to the water inlet is closed, and one end of the central tube corresponding to the water outlet is sealed and matched with the water storage component.

3. The reverse osmosis filter element according to claim 2, wherein: The inner wall of the closed end of the central tube is provided with a support rib extending in the axial direction, and the support rib abuts against the water inlet end of the water storage component.

4. The reverse osmosis filter element according to claim 1, wherein: There are multiple abutment ribs, and the multiple abutment ribs are arranged at intervals along the circumference of the water storage component.

5. The reverse osmosis filter element according to claim 1, wherein: The abutting ribs include a first abutting rib adjacent to the water inlet and a second abutting rib adjacent to the water outlet.

6. The reverse osmosis filter element according to claim 1, wherein: An outer wall of the water storage component adjacent to one end of the water outlet is protruded with a reinforcing rib extending along the circumference of the outer wall of the water storage component.

7. The reverse osmosis filter element according to claim 6, characterized in that: An abutment rib is protruding from the outer wall of the water storage component, and a free end of the abutment rib protrudes from the reinforcing rib and abuts against the inner wall of the central tube.

8. The reverse osmosis filter element according to claim 1, wherein: The one-way conducting device includes a one-way valve.

9. The reverse osmosis filter element according to claim 8, characterized in that: The one-way valve includes a valve body, a valve core and a reset member; the valve body is sealed with the water inlet, and the valve body is provided with a water inlet hole, a water outlet hole, and a water passage connecting the water inlet hole and the water outlet hole; the valve core can be movably arranged in the water passage to block or open the water inlet hole under the action of the reset member or water flow.

10. The reverse osmosis filter element according to claim 9, characterized in that: A support member is provided at the water outlet end of the valve body. The reset member is an elastic member. One end of the elastic member abuts against the support member, and the other end abuts against the valve core.

11. The reverse osmosis filter element according to claim 10, wherein: The support member includes a limiting cylinder and a connecting rib connecting the limiting cylinder and the valve body. The valve core includes a water retaining portion and a limiting portion. The limiting portion slides with the limiting cylinder. The elastic member is sleeved on the limiting cylinder, and one end of the elastic member abuts the connecting rib, and the other end abuts the limiting portion.

12. A water purification device, characterized in that: The reverse osmosis filter element comprises the reverse osmosis filter element according to any one of claims 1 to 11.

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