A miniature seawater desalination device

Abstract

This invention provides a miniature seawater desalination unit, comprising a pressurization section and a reverse osmosis membrane section. The pressurization section housing is sealed at the end away from the seawater inlet. The miniature seawater desalination unit further includes an energy recovery section, comprising a recovery section housing with a concentrate inlet, a first concentrate outlet, and a concentrate outlet; a concentrate guide rod with a first water passage groove and a second water passage groove, and a concentrate guide hole inside the guide rod. When the concentrate guide rod slides axially within the recovery section housing, the first water passage groove connects to the first concentrate outlet, or the second water passage groove connects the concentrate inlet and the first concentrate outlet. This invention adds an energy recovery section to existing seawater desalination units, thereby improving upon existing technology by utilizing the pressure in the concentrate, allowing users to apply less force to pump seawater into the reverse osmosis membrane section for filtration.

Description

Technical Field

[0001] This invention relates to the field of seawater desalination, and more particularly to a miniature seawater desalination device. Background Technology

[0002] In existing technologies, seawater can be desalinated into potable water. The two main desalination methods are: 1. Distillation, which generally requires fuel heating, consumes a large amount of energy, and emits carbon dioxide, resulting in high costs; 2. Membrane treatment, which uses special membranes (usually reverse osmosis membranes) to filter out the salt from seawater.

[0003] Currently, to ensure a sufficient, safe, and reliable supply of fresh water in emergencies, the primary method used is method 2 mentioned above (i.e., reverse osmosis membrane filtration). For example... Figure 1 The diagram shows the structure of a commonly used seawater filtration device, which includes a pressurization unit 1' and a reverse osmosis membrane unit 2'. The pressurization unit 1' includes a pressurization unit housing 1'-1 and a piston 1'-2. The reverse osmosis membrane unit 2' includes a membrane housing 2'-1 and a reverse osmosis membrane 2'-2. A handle is connected to the piston 1'-2 via a piston rod. By controlling the handle, the piston 1'-2 is pushed to reciprocate within the pressurization unit housing 1'-1, thereby continuously pressurizing seawater through the seawater inlet 3' into the reverse osmosis membrane unit 2'. Under high pressure, water flows from one side of the reverse osmosis membrane 2'-2 to the other side, becoming pure water. The pure water is discharged from the pure water outlet 5', while the concentrated water, after reaching a certain pressure, is discharged from the concentrated water outlet 4', which is equipped with a pressure relief valve.

[0004] However, due to the reverse osmosis membrane, sufficient pressure must be applied to achieve reverse osmosis and produce fresh water when using the above-mentioned seawater filtration device, which is quite laborious, and the pressure of the concentrated water itself is wasted. Summary of the Invention

[0005] To address the problems in the prior art, this invention improves upon it by providing a miniature seawater desalination device that utilizes the pressure of concentrated water and makes seawater filtration more labor-saving. The technical solution of this invention is as follows:

[0006] 1. A miniature seawater desalination device, comprising a pressurization unit and a reverse osmosis membrane unit, wherein the pressurization unit is used to extract seawater and deliver it into the reverse osmosis membrane unit, the reverse osmosis membrane unit being used for seawater desalination; the end of the pressurization unit housing away from the seawater inlet is sealed; and

[0007] The miniature seawater desalination device also includes an energy recovery unit, which comprises:

[0008] The recovery section shell is provided with a concentrate inlet, a first concentrate outlet, and a concentrate outlet. The concentrate in the reverse osmosis membrane section flows unidirectionally to the concentrate inlet. The first concentrate outlet is connected to the side of the pressurization section shell away from the seawater inlet.

[0009] A concentrate guide rod is provided, with one end extending into the housing of the recovery section and the other end extending out of the housing. The concentrate guide rod is provided with a first water passage groove and a second water passage groove, and a concentrate guide hole is provided inside the concentrate guide rod. The first water passage groove is connected to the concentrate outlet through the concentrate guide hole. The concentrate guide rod slides along its axial direction in the housing of the recovery section, thereby connecting the first water passage groove to the first concentrate flow port or connecting the second water passage groove to the concentrate inlet and the first concentrate flow port.

[0010] 2. As described in item 1, the miniature seawater desalination device has sealing rings on both sides of the first and second water passages on the concentrate guide rod.

[0011] 3. The miniature seawater desalination device as described in item 1, wherein the reverse osmosis membrane section comprises:

[0012] The membrane shell is provided with a seawater inlet, a pure water outlet, and a concentrated water outlet.

[0013] A reverse osmosis membrane is disposed within the membrane housing.

[0014] The seawater inlet, the concentrate outlet, and the pure water outlet are located on both sides of the reverse osmosis membrane.

[0015] 4. The miniature seawater desalination device as described in item 3, wherein the pressurization unit includes...

[0016] The booster housing,

[0017] The piston is located inside the pressurization unit housing.

[0018] A piston rod, one end of which is connected to the piston, and the other end of which extends out of the pressurization housing;

[0019] The pressurization unit housing is provided with a seawater inlet and a seawater outlet at one end away from the piston rod; the seawater inlet is unidirectionally connected to the inside of the pressurization unit housing; the seawater outlet is unidirectionally connected to the seawater inlet; and a second concentrated water outlet is provided at the other end of the pressurization unit housing, which is connected to the first concentrated water outlet.

[0020] 5. The miniature seawater desalination device as described in item 4, wherein a pressure relief valve is provided between the seawater outlet and the seawater inlet.

[0021] 6. The miniature seawater desalination device as described in item 4 further includes a handle and a connector;

[0022] The handle and the connector, as well as the connector and the end of the piston rod away from the piston, are all rotatably connected; and

[0023] The handle is rotatably connected to one end of the concentrate guide rod that extends out of the recovery section housing.

[0024] 7. The micro seawater desalination device described in item 6, wherein the energy recovery unit further includes a limiting structure;

[0025] The limiting structure is a tubular structure, which is fixedly connected to the housing of the recovery section;

[0026] The limiting structure has a strip-shaped through hole;

[0027] The concentrate guide rod extends out of the recovery section housing and is located within the limiting structure. The handle is rotatably connected to the concentrate guide rod via a connecting rod passing through the strip-shaped through hole.

[0028] 8. The miniature seawater desalination device as described in item 7, wherein the connecting rod is a bolt or a pin.

[0029] 9. The micro seawater desalination device as described in item 7, wherein the limiting structure extends into the housing of the recovery section, and the concentrate guide rod slides along its axial direction within the limiting structure;

[0030] The limiting structure has through holes at the concentrated water inlet and the first concentrated water outlet.

[0031] 10. The micro seawater desalination device as described in item 4, wherein the diameter of the piston at one end near the piston rod is smaller than the diameter at the other end.

[0032] 11. The miniature seawater desalination device as described in item 4 further includes a filter and a hose;

[0033] One end of the hose is connected to the seawater inlet, and the other end is connected to the filter.

[0034] 12. The miniature seawater desalination device as described in item 11, wherein a counterweight is provided at one end of the hose where the filter is located.

[0035] This invention provides a miniature seawater desalination device that improves upon existing technology by adding an energy recovery unit. It utilizes the pressure in the concentrated water, allowing users to apply less force to pump seawater into the reverse osmosis membrane for filtration. Furthermore, the invention incorporates a limiting structure, facilitating near-circular movement of the handle and making it easier for the user to apply force. Additionally, the invention features a uniquely shaped piston, increasing the desalination device's lifespan, reducing production costs, and enhancing reliability. Moreover, the inclusion of a filter and counterweight further extends the desalination device's lifespan and makes it easier to use.

[0036] The above description is merely an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and more understandable, so that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0037] Figure 1 : A schematic diagram of the principle of a seawater filter in the prior art;

[0038] Figure 2 : A front view schematic diagram of a miniature seawater desalination device in one embodiment;

[0039] Figure 3 : A schematic diagram of the pressurization section and energy recovery section of a miniature seawater desalination unit in one embodiment;

[0040] Figure 4 : A schematic diagram of the reverse osmosis membrane section of a miniature seawater desalination unit in one embodiment;

[0041] Figure 5 : A schematic diagram of a micro seawater desalination device in one embodiment;

[0042] Figure label:

[0043] 1. Pressurization unit; 1-1. Pressurization unit housing; 1-2. Piston; 1-3. Piston rod; 1-4. Seawater inlet; 1-5. Seawater outlet; 1-6. Second concentrate outlet;

[0044] 2. Reverse osmosis membrane section; 2-1. Membrane casing; 2-2. Reverse osmosis membrane; 2-3. Seawater inlet; 2-4. Pure water outlet; 2-5. Concentrate outlet;

[0045] 3. Energy recovery unit; 3-1. Recovery unit housing; 3-2. Concentrate inlet; 3-3. First concentrate outlet; 3-4. Concentrate outlet; 3-5. Concentrate guide rod; 3-6. First water passage; 3-7. Second water passage; 3-8. Concentrate guide hole; 3-9. Sealing ring; 3-10. Limiting structure; 3-11. Strip-shaped through hole; 3-12. Connecting rod;

[0046] 4. Handle;

[0047] 5. Connectors. Detailed Implementation

[0048] The following embodiments of the present invention are merely illustrative of specific implementations of the invention and should not be construed as limiting the invention. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the invention are considered equivalent substitutions and fall within the protection scope of the invention.

[0049] This embodiment provides a miniature seawater desalination device, an improvement on the prior art, including a pressurization unit 1 and a reverse osmosis membrane unit 2. The pressurization unit 1 is used to extract seawater and pressurize it into the reverse osmosis membrane unit 2, which is used for seawater desalination. Figures 2-5 As shown, the end of the pressurization unit housing away from the seawater inlet of the pressurization unit 1 is sealed. This embodiment focuses on the new structure added by the present invention, namely the energy recovery unit 3, which includes:

[0050] The recovery section housing 3-1 is provided with a concentrated water inlet 3-2, a first concentrated water outlet 3-3, and a concentrated water outlet 3-4. The concentrated water in the reverse osmosis membrane section flows unidirectionally to the concentrated water inlet 3-2. The first concentrated water outlet 3-3 is connected to the side of the pressurization section housing away from the seawater inlet.

[0051] A concentrate guide rod 3-5 is provided, with one end extending into the recovery section housing 3-1 and the other end extending out of the recovery section housing 3-1. The concentrate guide rod 3-5 is provided with a first water passage groove 3-6 and a second water passage groove 3-7. A concentrate guide hole 3-8 is provided inside the concentrate guide rod. The first water passage groove 3-6 is connected to the concentrate outlet 3-4 through the concentrate guide hole 3-8. The concentrate guide rod slides along its axial direction in the recovery section housing 3-1, thereby connecting the first water passage groove 3-6 to the first concentrate flow port 3-3 or connecting the second water passage groove 3-7 to the concentrate inlet 3-2 and the first concentrate flow port 3-3.

[0052] Preferably, the first water passage 3-6 and the second water passage 3-7 are both arranged around the circumference of the concentrated water guide rod 3-5.

[0053] As mentioned above, this embodiment is an improvement on the prior art. In this application, by setting up an energy recovery unit 3, when the piston 1-2 moves to the left, seawater is drawn into the pressurization unit housing 1-1; when the piston 1-2 moves to the right, the seawater is forced into the reverse osmosis membrane unit 2. At this time, the concentrated water guide rod 3-5 is controlled to move to the left, that is, the second water passage 3-7 connects the concentrated water inlet 3-2 and the first concentrated water outlet 3-3. The concentrated water from the reverse osmosis membrane unit flows into the left side of the piston 1-2 through the concentrated water inlet 3-2, the second water passage 3-7, and the first concentrated water outlet 3-3. That is, the pressure of the concentrated water is applied to the piston 1-2. A force is applied to the right by piston 1-2, allowing the user to push seawater into the reverse osmosis membrane section 2 with less force for filtration, and the seawater flows out from the pure water outlet; when the user applies force again to move piston 1-2 to the left to draw seawater, the concentrated water guide rod 3-5 is manipulated to move to the right, so that the first water passage 3-6 can be connected to the first concentrated water flow port 3-3, so that the concentrated water on the left side of piston 1-2 is discharged through the first concentrated water flow port 3-3, the first water passage 3-6, the concentrated water guide hole 3-8, and the concentrated water outlet 3-4.

[0054] Therefore, it can be understood that this application improves upon the prior art by adding an energy recovery unit 3, utilizing the pressure in the concentrated water, and enabling the user to apply less force to pump seawater into the reverse osmosis membrane unit 2 for filtration.

[0055] Furthermore, based on the content of this application, those skilled in the art will understand that since the energy recovery section 3 of this application is provided with a concentrate outlet 3-4, it is not necessary to provide a concentrate outlet 4' on the reverse osmosis membrane section 2' as in the prior art described above.

[0056] In another embodiment, such as Figure 3 As shown, on the concentrated water guide rod, sealing rings 3-9 are provided on both sides of the first and second water passages.

[0057] In another embodiment, such as Figures 2-5 As shown, the reverse osmosis membrane section 2 includes:

[0058] The membrane housing 2-1 is provided with a seawater inlet 2-3, a pure water outlet 2-4, and a concentrated water outlet 2-5.

[0059] Reverse osmosis membrane 2-2 is disposed inside membrane housing 2-1.

[0060] The seawater inlet 2-3, the concentrated water outlet 2-5, and the pure water outlet 2-4 are located on both sides of the reverse osmosis membrane 2-2.

[0061] Preferably, the reverse osmosis membrane 2-2 is arranged in a ring shape. More preferably, the pure water outlet 2-4 is connected to the interior of the reverse osmosis membrane 2-2, and the seawater inlet 2-3 and the concentrate outlet 2-5 are connected to the exterior of the reverse osmosis membrane 2-2.

[0062] More preferably, a one-way valve for concentrated water outflow is provided on the concentrated water outlet 2-5.

[0063] This embodiment specifically provides a reverse osmosis membrane section 2, which is provided with a seawater inlet 2-3 and a concentrate outlet 2-5 for communicating with the concentrate inlet 3-2 of the energy recovery section 3.

[0064] In another embodiment, such as Figures 2-5 As shown, the pressurization unit 1 includes

[0065] Boost unit housing 1-1,

[0066] Piston 1-2 is installed inside the pressurization unit housing 1-1.

[0067] Piston rod 1-3, one end of which is connected to piston 1-2, and the other end extends out of the pressurization housing; as mentioned above, the end of pressurization housing 1-1 away from the seawater inlet of pressurization 1 is sealed, that is, the piston rod 1-3 extends out of pressurization housing 1-1 and together with pressurization housing 1-1, forms a sealed cavity inside pressurization housing 1-1;

[0068] The pressurization housing 1-1, located away from the piston rod 1-2, is provided with a seawater inlet 1-4 and a seawater outlet 1-5. The seawater inlet 1-4 is unidirectionally connected to the pressurization housing 1-1, meaning that seawater can only flow into the pressurization housing 1-1 through the seawater inlet 1-4. In this embodiment, this is achieved by installing a one-way valve at the seawater inlet 1-4. The seawater outlet 1-5 is unidirectionally connected to the seawater inlet 2-3, meaning that seawater can only flow from the seawater outlet 1-5 to the seawater inlet 2-3. In this embodiment, this is achieved by installing a one-way valve between the seawater outlet 1-5 and the seawater inlet 2-3. The other end of the pressurization housing 1-1 is provided with a second concentrated water outlet 1-6, which is connected to the first concentrated water outlet 3-3.

[0069] Preferably, the piston 1-2 is provided with a sealing ring in the circumferential direction.

[0070] This embodiment specifically provides a pressurization unit 1, which consists of a piston 1-2 installed inside a pressurization unit housing 1-1. The piston 1-2 is driven to move by a piston rod. When the piston 1-2 moves to the left, seawater is drawn into the pressurization unit housing 1-1, while concentrated water on the left side of the piston 1-2 is discharged. When the piston 1-2 moves to the right, concentrated water enters the left side of the piston 1-2. The pressure of the concentrated water, together with the thrust of the piston rod 1-3, pushes the piston 1-2 to the right, thereby allowing the seawater on the right side of the piston 1-2 to enter the reverse osmosis membrane section 2. This allows the user to filter seawater into pure water with less force.

[0071] Additionally, it should be noted that in this application, the pressurization unit housing 1-1, the membrane unit housing 2-1, and the recovery unit housing 3-1 can be separate units, integrated units, or two of them integrated units while the third unit is separate, as long as they can each form a cavity to accommodate the piston 1-2, the reverse osmosis membrane 2-2, and the concentrate guide rod 3-5.

[0072] In another embodiment, a pressure relief valve is provided between the seawater outlet 1-5 and the seawater inlet 2-3.

[0073] This embodiment, by setting a pressure relief valve, can prevent excessive pressure in the pressurization section housing 1-1, the membrane section housing 2-1, and the recovery section housing 3-1 from causing damage to structures such as the reverse osmosis membrane 2-2.

[0074] In another embodiment, such as Figures 2-5 As shown, it also includes a handle 4 and a connector 5;

[0075] The handle 4 and the connector 5, and the connector 5 and the end of the piston rod 1-3 away from the piston 1-2 are all rotatably connected; and

[0076] The handle 4 is rotatably connected to one end of the concentrate guide rod extending 3-5 out of the recovery section housing.

[0077] Based on the above, those skilled in the art will know that the piston 1-2 is subjected to a resistance in its axial direction whether it is drawing or pumping seawater; while the concentrated water guide rod 3-5 does not have a corresponding resistance in its axial direction.

[0078] Therefore, in this embodiment, the handle 4 / connector 5 is connected to the piston rod 1-3 and the concentrate guide rod 3-5. This allows the handle 4 to function as a lever when it drives the piston rod 1-3 to move the piston 1-2, enabling the user to filter seawater with less force. Simultaneously, when the handle 4 is pressed down, pushing the piston 1-2 to the right, the piston 1-2 experiences resistance from the seawater moving to the left, while the concentrate guide rod 3-5 experiences no corresponding resistance in its axial direction. Therefore, the concentrate guide rod 3-5 first moves to the left, connecting the second water passage 3-7 to the concentrate inlet 3-2 and the first concentrate outlet 3-2. 3. The concentrated water outside the reverse osmosis membrane 2-2 flows into the left side of the piston 1-2 through the concentrated water outlet 2-5, the concentrated water inlet 3-2, the second water passage 3-7, and the first concentrated water outlet 3-3. Similarly, when the handle 4 is pulled up, the piston 1-2 is resisted to the right by the seawater and concentrated water, while the concentrated water guide rod 3-5 has no corresponding resistance in its axial direction. Therefore, the concentrated water guide rod 3-5 first moves to the right, so that the first water passage 3-6 connects to the first concentrated water outlet 3-3, thereby allowing the concentrated water on the left side of the piston 1-2 to be discharged through the first concentrated water outlet 3-3, the first water passage 3-6, the concentrated water guide hole 3-8, and the concentrated water outlet 3-4. By continuously pulling up and pressing down the handle 4, seawater desalination is continuously carried out.

[0079] Therefore, it can be understood that, through the technical solution of this embodiment, the piston rod 1-3 and the concentrate guide rod 3-5 can be connected through the handle 4 / connector 5, and the piston can be driven to move by lever principle to reduce the applied force; at the same time, the piston 1-2 and the concentrate guide rod 3-5 can be driven to move by the handle 4, thereby realizing the simultaneous extraction / pumping of seawater and control of the energy recovery unit 3, making the operation simple and convenient.

[0080] In another embodiment, such as Figures 2-5 As shown, the energy recovery unit 3 also includes a limiting structure 3-10.

[0081] The limiting structure 3-10 is a tubular structure, which is fixedly connected to the housing 3-1 of the recovery section.

[0082] The limiting structure 3-10 has a strip-shaped through hole 3-11.

[0083] The concentrate guide rod 3-5 extends out of the recovery section housing 3-1 at one end and is located inside the limiting structure 3-10. The handle 4 is rotatably connected to the concentrate guide rod 3-5 through the connecting rod 3-12 passing through the strip-shaped through hole.

[0084] Preferably, the connecting rod is a bolt or a pin.

[0085] In this embodiment, a limiting structure 3-10 is provided for the concentrate guide rod 3-5. The limiting structure 3-10 is fixedly connected to the recovery housing 3-1. The handle 4 is rotatably connected to the concentrate guide rod 3-5 via a connecting rod passing through the strip-shaped through hole 3-11. When the handle 4 is pressed down / pulled up, due to the limitation of the strip-shaped through hole 3-11, the connecting rod can only reciprocate within the stroke limited by the strip-shaped through hole 3-11. This controls the concentrate guide rod 3-5 to reciprocate only within a certain range, thereby allowing for more accurate control of the movement range of the concentrate guide rod 3-5. Consequently, it allows for more accurate control of the connection between the first water passage 3-6 and the first concentrate flow port 3-3, or the connection between the second water passage 3-7 and the concentrate inlet 3-2 and the first concentrate flow port 3-3. In addition, because the strip-shaped through hole 3-11 limits the movement of the connecting rod to a small range, the handle 4 moves almost in a circular motion, making it easier for the user to apply force.

[0086] Regarding the length of the strip-shaped through hole 3-11, those skilled in the art know that it can be set according to the positions of the first water passage 3-6, the second water passage 3-7, the concentrated water inlet 3-2, and the first concentrated water outlet 3-3, and will not be elaborated here.

[0087] In another embodiment, such as Figures 2-5 As shown, the limiting structure 3-10 extends into the housing 3-1 of the recovery section, and the concentrate guide rod 3-5 slides within the limiting structure 3-10 along its axial direction;

[0088] The limiting structure 3-10 has through holes at the concentrated water inlet 3-2 and the first concentrated water outlet 3-3.

[0089] That is, in this embodiment, the limiting structure 3-10 is nested on the outside of the concentrate guide rod 3-5. It can not only achieve the above-mentioned limiting function, but also prevent the concentrate guide rod 3-5 from wearing down the inner wall of the recovery section housing 3-1. Even if the inner side of the limiting structure 3-10 is worn, only the limiting structure 3-10 needs to be replaced, and there will be no situation where the inner wall of the recovery section housing 3-1 is worn down and the recovery section housing 3-1 needs to be replaced, or even the entire seawater desalination unit becomes unusable.

[0090] In another embodiment, such as Figures 2-5 As shown, the diameter of the piston 1-2 near the piston rod end is smaller than the diameter of the other end.

[0091] Preferably, the pistons 1-2 are frustum-shaped.

[0092] It should be noted that the diameter in this application refers to the diameter of the equivalent circle area.

[0093] Due to the limitations of the reverse osmosis membrane principle, considerable pressure is required during seawater desalination. In the process described above, where the piston 1-2 is moved by the pressure of the concentrated water, if the piston is a standard cylinder, when it moves from the leftmost end to the right, the concentrated water at the left end of the piston is created from nothing. During this process, the concentrated water impacts the inner wall of the pressurization housing 1-1 at high speed. Therefore, this high-speed impact on the inner wall of the pressurization housing 1-1 will occur in each cycle of the piston's reciprocating motion. Consequently, after prolonged use, this will inevitably damage the pressurization housing 1-1, rendering the seawater desalination unit unusable, reducing its lifespan, or requiring better materials for the pressurization housing 1-1, thus increasing the manufacturing cost of the seawater desalination unit. In addition, due to assembly precision and other reasons, the cylindrical piston 1-2 may completely cover the second concentrated water flow port 1-6 when it is at the leftmost end. This makes it as if a vacuum is drawn on the left side of the piston when the piston 1-2 is pushed out to the right, requiring more force to start each piston movement cycle, thus making it difficult to use.

[0094] In this application, the diameter of the piston 1-2 near the piston rod is smaller than the diameter of the other end, so that even when the piston 1-2 moves to the leftmost end, a small amount of concentrated water is still stored between the piston 1-2 and the pressurization housing 1-1. This significantly reduces the impact of concentrated water on the inner wall of the pressurization housing 1-1 in each cycle. At the same time, because there is space between the side of the piston 1-2 and the inner wall of the pressurization housing 1-1, the situation of the piston 1-2 blocking the second concentrated water outlet 1-6 can be completely avoided. This allows the user to perform each piston movement cycle for seawater desalination with less effort.

[0095] In another embodiment, a filter and a hose are also included;

[0096] One end of the hose is connected to the seawater inlet, and the other end is connected to the filter.

[0097] Seawater can be coarsely filtered through filters to remove impurities, thereby extending the service life of seawater desalination equipment, especially reverse osmosis membranes.

[0098] The filter can be any commercially available filter, so it will not be discussed further here.

[0099] In another embodiment, a counterweight is provided at one end of the hose where the filter is disposed.

[0100] Since hoses, filters, and other components are mostly made of plastic, when a seawater desalination unit is used at sea, its hoses and filters tend to float on the sea surface, which is not conducive to the pressurization unit 1's extraction of seawater.

[0101] This embodiment uses a counterweight to ensure that one end of the filter is completely submerged below the sea surface, thus ensuring the normal operation of the seawater desalination unit.

[0102] The counterweight can be made of metal or other materials with a density greater than that of seawater.

[0103] Although the embodiments of this application have been described above, this application is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art can make many other forms based on the guidance of this specification and without departing from the scope of protection of the claims of this invention, and these are all within the scope of protection claimed in this application.

Claims

1. A miniature seawater desalination device, comprising a pressurization unit and a reverse osmosis membrane unit, wherein the pressurization unit is used to extract seawater and pressurize the seawater into the reverse osmosis membrane unit, and the reverse osmosis membrane unit is used to desalinate the seawater into drinking water; Its features are, The pressurizing section housing is sealed at the end furthest from the seawater inlet; and The miniature seawater desalination device also includes an energy recovery unit, which comprises: The recovery section shell is provided with a concentrate inlet, a first concentrate outlet, and a concentrate outlet. The concentrate in the reverse osmosis membrane section flows unidirectionally to the concentrate inlet. The first concentrate outlet is connected to the side of the pressurization section shell away from the seawater inlet. A concentrate guide rod is provided, with one end extending into the housing of the recovery section and the other end extending out of the housing. The concentrate guide rod is provided with a first water passage groove and a second water passage groove, and a concentrate guide hole is provided inside the concentrate guide rod. The first water passage groove is connected to the concentrate outlet through the concentrate guide hole. The concentrate guide rod slides along its axial direction in the housing of the recovery section, thereby allowing the first water passage groove to connect to the first concentrate flow port or allowing the second water passage groove to connect the concentrate inlet and the first concentrate flow port. The energy recovery unit also includes a limiting structure; the limiting structure is a tubular structure, which is fixedly connected to the housing of the recovery unit; the limiting structure has a strip-shaped through hole; the concentrate guide rod extends out of the housing of the recovery unit and is located inside the limiting structure, and the handle is rotatably connected to the concentrate guide rod through a connecting rod passing through the strip-shaped through hole; the limiting structure extends into the housing of the recovery unit, and the concentrate guide rod slides along its axial direction within the limiting structure; the limiting structure has through holes at the concentrate inlet and the first concentrate outlet.

2. The miniature seawater desalination device as described in claim 1, characterized in that, The pressurization unit includes: a pressurization unit housing; a piston disposed inside the pressurization unit housing; a piston rod, one end of which is connected to the piston and the other end of which extends out of the pressurization unit housing; wherein, the end of the pressurization unit housing away from the piston rod is respectively provided with a seawater inlet and a seawater outlet; the seawater inlet is unidirectionally connected to the inside of the pressurization unit housing; a second concentrated water outlet is provided on the other end of the pressurization unit housing, and the second concentrated water outlet is connected to the first concentrated water outlet.

3. The miniature seawater desalination device as described in claim 2, characterized in that, The diameter of the piston at one end near the piston rod is smaller than the diameter at the other end.

4. The miniature seawater desalination device as described in claim 2, characterized in that, The miniature seawater desalination device also includes a handle and a connector; the handle and the connector, as well as the connector and the end of the piston rod away from the piston, are rotatably connected; and the handle is rotatably connected to the end of the concentrate guide rod that extends out of the recovery section housing.

5. The miniature seawater desalination device as described in claim 1, characterized in that, The pressurization unit also includes a filter and a hose; one end of the hose is connected to the seawater inlet, and the other end is connected to the filter.

6. The miniature seawater desalination device as described in claim 5, characterized in that, The end of the hose where the filter is located is equipped with a counterweight.

7. The miniature seawater desalination device as described in claim 1, characterized in that, On the concentrated water guide rod, sealing rings are provided on both sides of the first and second water passages.

8. The miniature seawater desalination device as described in claim 2, characterized in that, The reverse osmosis membrane section includes: The membrane shell is provided with a seawater inlet, a pure water outlet, and a concentrated water outlet. A reverse osmosis membrane is disposed within the membrane housing. The seawater inlet, the concentrate outlet, and the pure water outlet are located on both sides of the reverse osmosis membrane; the seawater outlet to the seawater inlet is unidirectionally connected.

9. The miniature seawater desalination device as described in claim 8, characterized in that, A pressure relief valve is provided between the seawater outlet and the seawater inlet.

10. The miniature seawater desalination device as described in claim 1, characterized in that, The connecting rod is a bolt or a pin.

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