CN210150872U

CN210150872U - Portable sea water desalting device

Info

Publication number: CN210150872U
Application number: CN201920976128.XU
Authority: CN
Inventors: 李玉睿; 兰菲
Original assignee: Golden Wind Environmental Protection Co Ltd
Current assignee: DASMART ENVIRONMENTAL TECHNOLOGIES (BEIJING) CO LTD
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-03-17
Anticipated expiration: 2029-06-25

Abstract

The utility model provides a portable seawater desalination device, which comprises a pressurizing module and a desalination module, wherein the pressurizing module is provided with a pressurizing cavity and a piston rod positioned in the pressurizing cavity, and the pressurizing cavity is provided with a water inlet; the desalination module has a filter cavity, the filter cavity is separated for first filter cavity and second filter cavity by the first guide plate of setting in the filter cavity, first filter cavity is located the below of second filter cavity, first filter cavity and pressurization chamber intercommunication are provided with the filter tube bank that is formed by the nanofiltration membrane in the first filter cavity, filter tube bank and the lateral wall interval of first filter cavity set up in order to form annular cavity, filter tube bank's lower extreme and pressurization chamber intercommunication, partly can follow the lateral wall of filter tube bank and ooze the back and get into annular cavity from pressurization chamber and introduce the sea water of filter tube bank, the back gets into the second filter cavity, another part becomes strong brine, discharge from filter tube bank's upper end, compact structure, and convenient operation.

Description

Portable sea water desalting device

Technical Field

The utility model belongs to the technical field of the sea water desalination, especially, relate to a portable sea water desalination device.

Background

The seawater desalination technology is continuously developed and becomes an important means for solving the problem of insufficient water resources in coastal areas gradually, but most seawater desalination devices usually depend on conventional energy sources, stable energy supply and long-term fields are needed, and for islands far away from continents and lacking in energy sources, ships with limited power supply, offshore platforms, emergency rescue at sea, wilderness survival, scientific investigation and other special occasions with short-term and small-amount seawater desalination requirements, the manpower-driven portable seawater desalination device is increasingly emphasized due to the advantages of compact structure, small volume, risk resistance, diversified use conditions and the like, so the manpower-driven portable seawater desalination device has urgent market requirements.

The existing manually-driven seawater desalination device is usually a reverse osmosis membrane method for seawater desalination, but the reverse osmosis membrane method has high operating pressure, usually above 5.5Mpa, and usually requires long levers for seawater pressurization.

There is a need in the art to provide a portable seawater desalination plant that is compact and easy to operate.

SUMMERY OF THE UTILITY MODEL

One of the objects of the present invention is to provide a portable seawater desalination device.

To the above purpose, the present invention provides the following technical solutions:

according to one aspect of the present invention, there is provided a portable seawater desalination apparatus comprising a pressurizing module and a desalination module, the pressurizing module having a pressurizing chamber and a piston rod located in the pressurizing chamber, the pressurizing chamber having a water inlet; the desalination module is provided with a filter cavity, a first guide plate arranged in the filter cavity divides the filter cavity into a first filter cavity and a second filter cavity, the first filter cavity is positioned below the second filter cavity, the first filter cavity is communicated with the pressurization cavity, a filter tube bundle formed by a nanofiltration membrane is arranged in the first filter cavity, the filter tube bundle and the side wall of the first filter cavity are arranged at intervals to form an annular cavity, the lower end of the filter tube bundle is communicated with the pressurization cavity, a part of the first guide plate positioned above the annular cavity is provided with a first one-way circulation hole, one part of seawater introduced into the filter tube bundle from the pressurization cavity can permeate into the annular cavity from the side wall of the filter tube bundle and can enter the second filter cavity from the first one-way circulation hole, and the other part of the seawater introduced into the filtration tube bundle becomes strong brine, exiting from the upper end of the filter tube bundle.

Preferably, the annular cavity is filled with a first filter material, and/or the second filter cavity is filled with a second filter material.

Preferably, the first filter material comprises a molecular sieve material and the second filter material is an ionic resin material.

Preferably, the pressurisation chamber is L-shaped, the pressurisation chamber comprising a vertically extending portion and a horizontally extending portion, the piston rod being disposed in the vertically extending portion of the pressurisation chamber, the filter chamber being disposed substantially in parallel with the vertically extending portion, the horizontally extending portion of the pressurisation chamber being located below the filter chamber.

Preferably, the center of the lower surface of the first guide plate is inwards sunken to form a concave cavity, so that a strong brine storage cavity is formed between the lower surface of the first guide plate and the upper end of the filter tube bundle and is communicated with the outside through a pipeline.

More specifically, the desalination module still has a fresh water storage cavity, the fresh water storage cavity sets up the top of second filter chamber to with the second filter chamber separates through the second guide plate, be provided with a plurality of one-way circulation holes of second on the second guide plate, the second filter chamber with the fresh water storage cavity passes through one-way circulation hole of second intercommunication, the upper portion of fresh water storage cavity is provided with the fresh water export.

According to the utility model discloses a concrete embodiment, the filter tube bank roughly is vertical setting, the desalination module is still including setting up the filter tube bank lower extreme accept the board, the cross sectional shape who accepts the board with the cross sectional shape of filter chamber is unanimous basically, and the area of accepting the board equals or slightly is less than the cross sectional area of filter chamber, the lower extreme fixed connection of filter tube bank in accept the board, and pass through it is fixed in to accept the board in the filter chamber.

Furthermore, a partition wall is arranged between the filter cavity and the horizontal extension part of the pressurizing cavity, a filter cavity water inlet is formed in the partition wall, the bearing plate is arranged on the partition wall, a plurality of through holes are formed in the position, corresponding to the filter cavity water inlet, of the bearing plate, the filter tube bundle comprises a plurality of tubular structures, and the lower ends of the plurality of tubular structures are inserted into the plurality of through holes.

Preferably, the upper end and the lower end of the filter tube bundle are respectively provided with a blocking plate for separating the upper port and the lower port of the filter tube bundle from the annular cavity, the position of the receiving plate corresponding to the lower end of the filter tube bundle is provided with a through hole, the area of the through hole is smaller than the sectional area of the lower end of the filter tube bundle, so that the outer edge of the lower end of the filter tube bundle is abutted against and fixed on the periphery of the through hole.

According to the utility model discloses a concrete embodiment, portable sea water desalination device still include with pressurize the suction chamber of chamber intercommunication, the water inlet intercommunication that sucks the chamber has the inlet tube, the water inlet of inlet tube is provided with the filter screen.

The utility model provides a portable sea water desalination device's beneficial effect lies in, its simple structure, convenient operation.

Drawings

The above and/or other objects and advantages of the present invention will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

fig. 1 is a structural diagram of a portable seawater desalination apparatus according to an embodiment of the present invention.

Description of reference numerals:

101. a filter screen; 102. A water inlet pipe;

103. a suction chamber; 201. A piston rod;

202. a first check valve; 203. A first press cap;

204. a seal member; 205. A pressurization cavity;

206. a second one-way valve; 301. A bearing plate;

302. a bundle of filter tubes; 303. An annular cavity;

304. a first baffle; 305. A second filter chamber;

306. a second baffle; 401. A fresh water outlet;

402. a water outlet pipe; 403. Water outlet sealing caps;

404. a second press cap; 405. A back pressure valve;

406. a strong brine storage cavity; 407. A fresh water storage cavity.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Referring to fig. 1, according to an aspect of the present invention, there is provided a portable seawater desalination apparatus comprising a pressurizing module and a desalination module, the pressurizing module may have a pressurizing chamber 205, and the pressurizing module may include a piston rod 201 disposed in the pressurizing chamber 205. The pressurizing chamber 205 is provided with a water inlet, and the piston rod 201 is movable relative to the pressurizing chamber 205 to reciprocate the piston rod 201 by an external force acting on the piston rod 201 to introduce seawater into the pressurizing chamber 205 through the pressurizing chamber water inlet and pressurize the seawater in the pressurizing chamber 205.

According to an aspect of the present invention, the piston rod 201 is inserted into the pressurizing chamber 205 from above the pressurizing chamber 205, and the inlet of the pressurizing chamber 205 is located at one side of the lower portion of the pressurizing chamber 205.

For better pressurization efficiency, the end of the piston rod 201 may be sealed with the pressurization chamber 205 to prevent seawater leakage. According to an embodiment of the present invention, the lower end of the piston rod 201 may be provided with a sealing element 204, so that the piston rod 201 is in close contact with the side wall of the pressurizing chamber 205. According to a specific embodiment of the present invention, the upper end of the pressurizing chamber 205 is provided with a first pressing cap 203, so as to prevent the piston rod 201 from falling off from the pressurizing chamber 205, and further seal the pressurizing chamber 205. However, the manner of sealing the pressurizing chamber 205 and limiting the piston rod 205 is not limited thereto.

The desalination module can have a filter chamber in communication with the pressurized chamber 205, and the desalination module can include a filter assembly disposed in the filter chamber to enable liquid introduced into the filter chamber from the pressurized chamber 205 to be filtered.

As an example, the portable seawater desalination apparatus according to the present invention may be formed in a barrel structure having an internal receiving chamber partitioned into a pressurizing chamber and a filtering chamber by a partition wall. For example, referring to FIG. 1, the pressurizing chamber 205 and the filter chamber of a portable seawater desalination apparatus may be arranged substantially side-by-side, and the pressurizing chamber 205 may extend to the lower portion of the filter chamber. More specifically, the pressurizing chamber may be generally L-shaped, including a vertically extending portion and a horizontally extending portion, for ease of operation, the piston rod 201 being disposed generally vertically within the vertically extending portion of the pressurizing chamber 205, the filter chamber extending vertically substantially juxtaposed with the piston rod 201, the horizontally extending portion of the pressurizing chamber 205 being located below the piston rod and the filter chamber. The fresh water outlet 401 and the brine outlet are generally disposed in the upper portion of the filter chamber. The arrangement structure can make the structure of the portable seawater desalination device more compact, thereby realizing the miniaturization of the portable seawater desalination device to a certain extent.

With continued reference to fig. 1, according to an embodiment of the present invention, the portable seawater desalination apparatus further comprises a suction chamber 103 communicated with the pressurization chamber 205, and a water inlet of the suction chamber 103 may be communicated with the water inlet pipe 102 for introducing seawater into the suction apparatus 103. The inlet of the inlet pipe 102 may be provided with a filter screen 101 to filter large particles such as silt. Further, the inlet of the pressurizing chamber 205 may be provided with a first check valve 202, and the first check valve 202 may be disposed between the suction chamber 103 and the pressurizing chamber 205 to allow the seawater from the outside to enter the pressurizing chamber 205 from the suction chamber 103 under the negative pressure of the pressurizing chamber 205.

Further, in order to achieve a directional flow of seawater and increase the efficiency of desalination, a second one-way valve 206 may be provided between the filtration chamber and the pressurizing chamber 205, and the second one-way valve 206 may allow seawater to enter the filtration chamber from the pressurizing chamber 205. According to a specific embodiment of the present invention, the second check valve 206 is disposed between the first filtering chamber and the pressurizing chamber 205.

According to a specific embodiment of the utility model, can be provided with first guide plate 304 in the middle part of filter chamber, this first guide plate 304 is separated the filter chamber from top to bottom for first filter chamber and second filter chamber 305, and first filter chamber is located second filter chamber 305 below. The inlet of the filter chamber may be located at the lower end of the first filter chamber and the fresh water outlet 401 of the filter chamber is located at the upper end of the second filter chamber 305. According to an embodiment of the present invention, the first flow guiding plate 304 extends substantially perpendicular to the extension direction of the filter cavity, that is, the first flow guiding plate 304 is disposed substantially parallel to the cross section of the filter cavity, but not limited thereto.

According to the utility model discloses a concrete implementation mode, wherein, the central authorities of first filter chamber can be provided with the filter tube bank 302 that is formed by the nanofiltration membrane, and filter tube bank 302 can set up in order to form annular cavity 303 with the lateral wall interval of first filter chamber, and filter tube bank 302's lower extreme can communicate in the water inlet of filter chamber, and filter tube bank 302's upper end can be provided with the strong brine export.

According to a specific embodiment of the present invention, the filter tube bundle 302 may include at least two tubular structures parallel to each other, and the tube wall of the tubular structure may be formed by a nanofiltration membrane to have a filtering function. According to a specific embodiment of the present invention, the filter tube bundle 302 may further include a blocking structure, so that the liquid introduced through the water inlet of the filter chamber can only enter into each tube of the filter tube bundle, and cannot enter into the gap between the adjacent tubes. The plugging structure may be located at the end of the filter tube bundle 302 and may be a flat plate-like plugging plate, which may include a plurality of through holes matching the tubular structures, and the end of each tubular structure may be secured to the plugging plate. Except for the through holes, the other parts of the blocking structure are not communicated, so that seawater in the pressurizing chamber 205 can be prevented from leaking into the annular chamber 303 without being filtered. According to the utility model discloses a concrete implementation mode, wherein the shutoff board can be two, and two shutoff boards can be located filter tube bank 302's both ends respectively, and the shutoff board of lower extreme can prevent that the sea water from entering into between the adjacent tubular structure from the lower extreme, and the shutoff board of upper end can prevent to flow back to between the adjacent tubular structure from the strong brine that flows out in filter tube bank 302's upper end.

The first baffle 304 may be disposed at an upper end of the filter tube bundle 302, and the first baffle 304 may include a central portion at the upper end of the filter tube bundle 302 and a peripheral portion above the annular cavity 303, and the peripheral portion may be provided with a first one-way flow hole, and a portion of the seawater entering the filter tube bundle 302 may seep out from the side wall of the filter tube bundle 302, enter the annular cavity 303, and enter the second filter cavity 305 from the first one-way flow hole. Another portion of the seawater entering filter tube bundle 302 becomes brine, which flows out of the upper port (i.e., brine outlet) of filter tube bundle 302 and may be discharged to the outside of the portable seawater desalination plant through outlet pipe 402. According to an embodiment of the present invention, the first one-way circulation holes may be evenly distributed on the outer peripheral portion of the first guide plate 304.

The utility model provides a portable seawater desalination device operation in-process can put inlet tube 102's one end that has filter screen 101 in the sea water earlier, drive piston rod 201 rebound to produce the negative pressure in pressurization chamber 205, first check valve 202 is opened, and second check valve 206 is closed, and external sea water then can be extruded into this pressurization chamber 205. Changing the direction of force on the piston rod 201 causes the piston rod 201 to move downward, the pressure in the pressurized chamber 205 to increase, the first one-way valve 202 to close, and the second one-way valve 206 to open, so that seawater can pass from the pressurized chamber 205 into the filter tube bundle 302.

Specifically, seawater may enter the bundle 302 from the lower port of the bundle 302, and a portion of the seawater may permeate through the side walls of the bundle 302 into the annular cavity 303, completing the first filtration. The liquid filtered by the filter tube bundle 302 can be collected in the first filter chamber, and the liquid level is continuously raised until the liquid reaches the first guide plate 304 and can enter the second filter chamber 305 through the first one-way through hole. Another portion may rise along the extent of the filter tube bundle 302 and may exit the brine outlet due to the difference in pressure above and below.

Still further, to further increase the filtration efficiency, the annular cavity 303 may be filled with a first filter material to re-filter the liquid filtered by the first filter tube bundle 302. Specifically, the first filter material may be a molecular sieve material or an ionic resin material.

The second filter cavity 305 may be filled with a second filter material to re-filter the liquid exiting through the first one-way flow aperture in the first baffle 304. The second filter material may be a molecular sieve material or an ionic resin material.

According to a specific embodiment of the present invention, the desalination module further comprises a fresh water storage chamber 407, the fresh water storage chamber 407 can be located above the second filter chamber 305, and a second guide plate 306 can be disposed between the second filter chamber 305 and the fresh water storage chamber 407. More specifically, the second baffle 306 can be disposed substantially parallel to the first baffle 304, but is not limited thereto. According to a specific embodiment of the present invention, the second guide plate 306 may be provided with a second one-way flow hole to allow the liquid in the second filter chamber 305 to enter the fresh water storage chamber 407 through the second one-way flow hole. According to a specific embodiment of the present invention, the second one-way circulation hole may be evenly distributed on the second guide plate 306. According to a specific embodiment of the present invention, the upper portion of the fresh water storage chamber 407 can be provided with a water outlet cap 403, and the fresh water outlet 401 is located at the top end of the water outlet cap 403. More specifically, the second pressing cap 404 is disposed above the water outlet sealing cap 403 to fasten and compress the water outlet sealing cap 403, so as to fix the filter tube bundle 302, the first filter material, the second filter material, the first flow guide plate 304, the second flow guide plate 306, and the like in the filter cavity.

According to a specific embodiment of the present invention, the first filtering material can be molecular sieve material, and the second filtering material can be ion resin material.

More closely, the utility model provides a portable seawater desalination device has included three filter unit, make the sea water can loop through filter tube bank 302, molecular sieve material and ion resin material filter, wherein, filter tube bank 302 is roughly vertical setting, make filtrating can be along the direction of height infiltration of the first filter chamber of perpendicular to annular cavity 303 in, the first one-way opening of annular cavity 303 top allows filtrating again to flow along the direction of height of first filter chamber, this kind makes the sea water from bottom to top carry out filterable mode of setting in proper order, can make sea water and filtering material fully contact, and the filtration efficiency is improved. On the other hand, the structure is more compact, and the miniaturization requirement of the portable seawater desalination device is met.

More specifically, according to the utility model discloses a specific embodiment, can be formed with the partition wall between the horizontal extension part in filter chamber and pressurization chamber, this partition wall can form the diapire of filter chamber, and the delivery port in pressurization chamber, the water inlet that also is the filter chamber can be seted up on this diapire, and filter tube bank 302 can roughly be vertical setting, and this filter tube bank 302's lower port can with locate the water inlet butt joint of filter chamber on this diapire. The cross-sectional area of the inlet to the filter chamber is less than or equal to the cross-sectional area of the lower end face of the tube bundle 302 so that seawater enters only the tube bundle 302 and does not seep into the annular cavity 303. More specifically, the water inlet of the filter cavity may be located in the center of the bottom wall of the first filter cavity, and the edge of the bottom wall of the filter tube bundle 302 may abut against the bottom wall of the filter cavity and be sealed with the bottom wall, so as to further prevent the seawater which is not filtered by the filter tube bundle 302 from permeating through the joint of the filter tube bundle 302 and the first filter cavity, and affecting the filtering effect.

When installing bundle 302 in the first filter cavity, it is necessary to accurately align the lower end of bundle 302 with the filter cavity inlet, however, during installation, precise alignment of the two may be difficult to achieve. Thus, still further, to facilitate installation of filter tube bundle 302, the lower end of filter tube bundle 302 may be provided with a receiving plate 301, the edge of the lower end of filter tube bundle 302 may be sealingly arranged on this receiving plate 301, and the receiving plate 301 may have a shape substantially corresponding to the cross-sectional shape of the filter chamber and an area equal to or slightly smaller than the cross-sectional area of the filter chamber. For ease of installation, the receiving plate 301 may be connected to the filter tube bundle 302 and then installed in the first filter chamber. By the cooperation of the socket plate 301 with the filter chamber side wall, the filter tube bundle can be accurately positioned without shifting and the filter tube bundle 302 is prevented from tipping over.

The adaptor plate 301 may have a central through hole to communicate the water inlet of the filter chamber with the lower port of the filter tube bundle 302. According to a specific embodiment of the present invention, the cross-sectional area of the central through hole of the receiving plate 301 is smaller than or equal to the cross-sectional area of the filter tube bundle 302. The outer edge of the adaptor plate 301 may be coupled to the side wall of the first filter chamber, and further, the outer circumferential surface of the adaptor plate 301 may be sealingly coupled to the side wall of the first filter chamber.

On the other hand, the receiving plate 301 may integrate the function of a lower blanking plate, i.e. having a plurality of through holes in the middle of the receiving plate 301, and the lower ends of the plurality of tubular structures of the filter tube bundle 302 are inserted into the plurality of through holes of the receiving plate 301, respectively, so as to achieve the fixation of the filter tube bundle 302 and the sealing between the adjacent tubular structures.

According to the utility model discloses a concrete embodiment, the operating pressure who receives the filter membrane can be 20bar-3mpa, and this operating pressure is less than the operating pressure of reverse osmosis membrane method, and consequently this portable sea water desalination device's wall thickness adopts the portable sea water desalination device's of reverse osmosis membrane method wall thickness can the attenuation among the prior art, and its operating piston rod 201's lever length also can shorten to can make portable sea water desalination device miniaturized.

According to the utility model discloses a specific embodiment, wherein can be formed with strong brine storage chamber 406 between filter tube bank 302's upper end and the first guide plate 304, filter tube bank 302's strong brine export can communicate in this strong brine storage chamber 406, and this strong brine storage chamber 406 can communicate has outlet pipe 402 to derive the strong brine. Specifically, the center of the lower surface of the first baffle 304 is recessed inwardly to form a cavity, and the lower surface of the first baffle 304 outside the cavity is sealingly engaged with the peripheral edge of the upper end of the filter tube bundle 302 to form a brine storage chamber 406 between the first baffle 304 and the upper end of the filter tube bundle 302. According to a specific embodiment of the present invention, the tail end of outlet pipe 402 is provided with back pressure valve 405 to keep the pressure in strong brine storage chamber 406, thereby can keep filter tube bundle 302 to have stable operating pressure.

According to a specific embodiment of the present invention, the fresh water storage cavity 407 can be connected to the outside through the fresh water outlet 401, and more specifically, the fresh water outlet 401 can be located on the top wall of the water sealing cap 403, and along with the liquid in the fresh water storage cavity 407 continuously collects, the liquid level continuously rises until the liquid level rises to the fresh water outlet 401 and then flows out.

The utility model provides a portable seawater desalination device has combined the double filtration of receiving filter membrane and molecular sieve material (and/or ionic resin material), and its filter effect is good. In addition, the working pressure of the nanofiltration membrane is lower than that of a portable seawater desalination device adopting a reverse osmosis membrane method in the prior art, so that the required wall thickness can be reduced, raw materials required by manufacturing are reduced, and the manufacturing cost is reduced. Besides, the lever is shortened along with the reduction of the working pressure, so that the structure of the portable seawater desalination device is more miniaturized. The utility model provides an ionic resin material can be ionic resin material.

Seawater entering the pressurized chamber 205 from the suction chamber 103 is first pressurized in the pressurized chamber 205 and then may enter the filter tube bundle 302 for desalination, wherein almost all of the divalent and higher valent ions, and most of the monovalent salt ions, are retained, and the total desalination rate can reach 90%. Unfiltered liquid within the filter tube bundle 302 will flow along the extent of the filter tube bundle 302 and out through the brine outlet. The liquid filtered by the filter tube bundle 302 enters the annular cavity 303 filled with molecular sieve material, further reducing the salt content in the water. The liquid desalted by the molecular sieve material enters a second filtering cavity filled with an ionic resin material, and the anion and cation functional groups in the ionic resin material adsorb the residual ions in the liquid, so that the aim of desalting seawater is fulfilled.

According to a specific embodiment of the utility model, the filtration aperture size of receiving the filter membrane is about 1 nm. The molecular sieve material is white, non-toxic and odorless crystal powder, and can adsorb various ions with the size within the range of 0.3-2 nm. The ionic resin material is an insoluble polymer compound having a network structure and a functional group (having an active group for exchanging ions). Generally, the particles may be spherical particles, but not limited thereto. The anion and cation functional groups in the ionic resin material can exchange and adsorb with anions and cations in water, thereby achieving the aim of desalting water samples.

The described features, structures, or characteristics of the invention may be combined in any suitable manner in one or more embodiments. In the description above, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

Claims

1. A portable seawater desalination apparatus, comprising:

a pressurizing module having a pressurizing cavity (205) and a piston rod (201) located in the pressurizing cavity (205), the pressurizing cavity (205) having a water inlet; and

a desalination module having a filter cavity divided into a first filter cavity and a second filter cavity (305) by a first flow guide plate (304) disposed in the filter cavity, the first filter cavity being located below the second filter cavity (305), the first filter cavity being in communication with the pressurization cavity (205),

the first filtering cavity is internally provided with a filter tube bundle (302) formed by a nanofiltration membrane, the filter tube bundle (302) and the side wall of the first filtering cavity are arranged at intervals to form an annular cavity (303), the lower end of the filter tube bundle (302) is communicated with the pressurization cavity (205), the part of the first guide plate (304) positioned above the annular cavity (303) is provided with a first one-way circulation hole, one part of seawater introduced into the filter tube bundle (302) from the pressurization cavity (205) can permeate into the annular cavity (303) from the side wall of the filter tube bundle (302) and can enter the second filtering cavity (305) from the first one-way circulation hole, and the other part of the seawater introduced into the filter tube bundle (302) becomes concentrated brine and is discharged from the upper end of the filter tube bundle (302).

2. The portable seawater desalination apparatus of claim 1, wherein the annular cavity (303) is filled with a first filter material and/or the second filter cavity is filled with a second filter material.

3. The portable seawater desalination apparatus of claim 2 wherein the first filter material comprises a molecular sieve material and the second filter material is an ionic resin material.

4. A portable seawater desalination apparatus as claimed in claim 3 wherein the pressurizing chamber (205) is L-shaped, the pressurizing chamber (205) comprising a vertically extending portion and a horizontally extending portion, the piston rod (201) being arranged in the vertically extending portion of the pressurizing chamber (205), the filter chamber being arranged substantially in parallel with the vertically extending portion, the horizontally extending portion of the pressurizing chamber (205) being located below the filter chamber.

5. The portable seawater desalination apparatus of claim 1, wherein the center of the lower surface of the first deflector (304) is recessed inward to form a concave cavity, so as to form a strong brine storage chamber (406) between the lower surface of the first deflector (304) and the upper end of the filter tube bundle (302), and the strong brine storage chamber (406) is communicated with the outside through a pipeline.

6. The portable seawater desalination apparatus of any one of claims 1 to 5, wherein the desalination module further comprises a fresh water storage chamber (407), the fresh water storage chamber (407) is disposed above the second filter chamber (305) and is separated from the second filter chamber (305) by a second diversion plate (306), the second diversion plate (306) is provided with a plurality of second one-way flow holes, the second filter chamber (305) is communicated with the fresh water storage chamber (407) by the second one-way flow holes, and the upper portion of the fresh water storage chamber (407) is provided with a fresh water outlet (401).

7. A portable seawater desalination plant as claimed in claim 6 wherein the filter tube bundle (302) is arranged substantially vertically, the desalination module further comprises a receiving plate (301) arranged at the lower end of the filter tube bundle (302), the cross sectional shape of the receiving plate (301) substantially corresponds to the cross sectional shape of the filter chamber, and the area of the receiving plate (301) is equal to or slightly less than the cross sectional area of the filter chamber, the lower end of the filter tube bundle (302) is fixedly connected to the receiving plate (301) and is fixed in the filter chamber by the receiving plate (301).

8. The portable seawater desalination apparatus of claim 7, wherein a partition wall is provided between the filter chamber and the horizontally extending portion of the pressurizing chamber (205), the partition wall is provided with a filter chamber water inlet, the adaptor plate (301) is provided on the partition wall, and a plurality of through holes are provided at positions of the adaptor plate (301) corresponding to the filter chamber water inlet, the filter tube bundle (302) comprises a plurality of tubular structures, and lower ends of the plurality of tubular structures are inserted into the plurality of through holes.

9. The portable seawater desalination apparatus according to claim 7, wherein the upper end and the lower end of the filtering tube bundle (302) are respectively provided with a blocking plate for separating the upper port and the lower port of the filtering tube bundle (302) from the annular cavity (303), and a through hole is formed in the receiving plate (301) at a position corresponding to the lower end of the filtering tube bundle (302), and the area of the through hole is smaller than the sectional area of the lower end of the filtering tube bundle (302), so that the outer edge of the lower end of the filtering tube bundle abuts against and is fixed on the periphery of the through hole.

10. The portable seawater desalination apparatus of claim 6, further comprising a suction chamber (103) communicated with the pressurization chamber (205), wherein a water inlet of the suction chamber (103) is communicated with a water inlet pipe (102), and a water inlet of the water inlet pipe (102) is provided with a filter screen (101).