An ultra-micro portable seawater desalination device

Abstract

The present invention relates to an ultra-micro portable seawater desalination device, belonging to the field of seawater desalination technology. It comprises a housing, a reverse osmosis membrane element, an isobaric double-acting pump, a handle push-pull drive assembly, a base assembly, an ultrafilter and a pre-filter; continuously pressing the handle push-pull drive assembly drives the piston to move up and down, controlling the opening and closing of the water inlet check valve and the non-return check valve. The seawater enters the water inlet tank after being filtered by the pre-filter and the ultrafilter, and enters the pressure tank through the seawater outlet hole; when the pressure in the device reaches the reverse osmosis pressure, the seawater enters the reverse osmosis membrane element, and the seawater desalinated by the reverse osmosis membrane flows from the fresh water tank at the bottom of the central tube through the fresh water channel to the fresh water outlet interface, and the brine in the reverse osmosis membrane flows from the brine flow channel to the brine outlet interface. The device is small in size, manually driven, energy-saving and environmentally friendly, portable and reliable, and desalinated seawater is standard drinking water that meets the needs of emergency life protection.

Description

Technical Field

[0001] The invention relates to an ultra-micro portable seawater desalination device, belonging to the technical field of seawater desalination. Background Art

[0002] Desalination is the process of producing fresh water by desalinating seawater. Reverse osmosis technology uses a semipermeable membrane, which allows only solvents to pass through but not solutes, to separate brine from fresh water. Because the reverse osmosis process requires a certain level of pressure, existing desalination systems typically connect the pressure pump and reverse osmosis membrane elements in parallel or series, resulting in a large device. Therefore, a small, portable desalination device is urgently needed. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide an ultra-micro portable seawater desalination device.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] An ultra-micro portable seawater desalination device, comprising a housing, a reverse osmosis membrane element, an isobaric double-acting pump, a handle push-pull drive assembly, a base assembly, an ultrafilter and a pre-filter;

[0006] The reverse osmosis membrane element comprises a central tube and a reverse osmosis membrane located on the outer wall of the central tube; the reverse osmosis membrane element is sheathed in the shell through a pressurized seal and a pressure chamber is formed between the reverse osmosis membrane element and the shell;

[0007] The shell and center tube are made of materials that can withstand pressures above 3MPa;

[0008] The isobaric double-acting pump comprises a water inlet check valve, a non-return check valve, a piston, a piston pressure tube and a piston sleeve (34); the water inlet check valve and the non-return check valve are both fixedly sealed with the central tube, and the water inlet check valve is located below the non-return check valve, and a water inlet chamber is formed between the non-return check valve and the water inlet check valve; the piston sleeve is located in the shell and fixedly sealed above the central tube, the piston pressure tube is fixed in the piston sleeve, the piston passes through the piston pressure tube and cooperates with the piston pressure tube through a guide positioning member, one end of the piston is connected to the valve core of the non-return check valve, and the other end is movably connected to the handle push-pull drive assembly, and the handle push-pull drive assembly drives the piston to move up and down; a seawater outlet hole I is opened on the piston pressure tube in the circumference, an annular energy storage pressure chamber is provided in the piston sleeve, an energy storage pressure regulator is provided in the energy storage pressure chamber, and seawater outlet holes II are distributed on the bottom of the energy storage pressure chamber; the energy storage pressure regulator stores energy and stabilizes pressure by the function of pressurizing and contracting and decompressing and expanding;

[0009] The ultrafilter is located in the central tube below the water inlet check valve. A fresh water tank is formed between the ultrafilter and the central tube. Fresh water outlet holes are evenly distributed on the inner wall of the central tube below the water inlet check valve.

[0010] The base assembly is located at the bottom of the shell and is fixedly sealed with the reverse osmosis membrane element. The base assembly is provided with a seawater inlet interface, a fresh water outlet interface and a brine outlet interface; one end of the seawater inlet interface is connected to the primary filter through an inlet pipe, and the other end is connected to the inlet of the ultrafilter through a pipeline; the outlet of the ultrafilter is connected to the water inlet check valve through a pipeline; a fresh water flow channel is formed between the fresh water outlet interface and the fresh water tank, the fresh water outlet interface is connected to the fresh water outlet pipe, a brine flow channel is formed between the brine outlet interface and the reverse osmosis membrane, and the brine outlet interface is connected to the brine outlet pipe.

[0011] During use, when the handle pushes and pulls the drive assembly upward, the water inlet chamber depressurizes. When the pressure drops below atmospheric pressure, the check valve closes and the inlet valve opens, allowing seawater to enter the ultrafilter through the pre-filter and the seawater inlet port. After ultrafiltration, it enters the water inlet chamber. When the handle pushes and pulls the drive assembly downward, the water inlet chamber pressurizes. When the pressure rises above atmospheric pressure, the inlet valve closes and the check valve opens, allowing pressurized seawater to enter the energy storage and pressure chamber through seawater outlet port I on the piston pressure pipe. When pressurized seawater reaches the threshold, it flows through seawater outlet port II at the bottom of the energy storage and pressure chamber, through the pressure chamber, and into the outer layer of the membrane assembly. Some fresh water seeps into the reverse osmosis membrane, and fresh water accumulated in the inner layer of the reverse osmosis membrane flows out through the freshwater outlet port on the central tube, the freshwater chamber, the freshwater flow channel, and the freshwater outlet port. As the seawater along the outer layer of the reverse osmosis membrane increases in salt content and decreases in water content, brine is formed and discharged through the brine flow channel and the brine outlet port.

[0012] Furthermore, the reverse osmosis membrane utilizes a graphene oxide membrane with controllable interlayer spacing, as described in Chinese Patent 201610575159.5, and is wound around the outer wall of a central tube. This graphene oxide membrane with controllable interlayer spacing can also lower the operating pressure threshold for reverse osmosis, or increase the salt rejection rate and freshwater output rate at the same pressure.

[0013] Furthermore, the central tube is made of a high-compressive-strength, low-density material described in Chinese patent application 202010490153.4. The material is resistant to corrosion at 10 MPa pressure and 35,000 ppm concentrated seawater, and is lightweight and wear-resistant.

[0014] Furthermore, the central tube doubles as the housing for both the isobaric dual-acting pump and the ultrafilter. The isobaric dual-acting pump is housed in the upper portion of the central tube's interior, while the ultrafilter is housed in the lower portion. A freshwater reservoir is formed between the central tube and the ultrafilter. The central tube serves three functions in one, physically integrating the essential functions of a seawater desalination system: a pressure pump (power), source water pretreatment (ultrafiltration), and freshwater collection.

[0015] Furthermore, the handle push-pull drive assembly includes a handle pressure rod, a rotating part and a rotating shaft; the rotating part is movably connected to the handle pressure rod and the piston through the rotating shaft, and a spring positioning column is provided between the rotating part and the handle pressure rod along the pressing direction; a rotating button is provided on the handle pressure rod, and the rotating button cooperates with the rotating part through the positioning push rod to put the handle pressure rod into a working or non-working state; in the working state, pressing the handle pressure rod drives the piston to move up and down.

[0016] Furthermore, the handle push-pull drive assembly also includes a cover body, a handle pressure rod sliding groove is opened on the cover body, and the cover body is fixed to the shell.

[0017] Furthermore, the primary filter is a semicircular structure that matches the outer wall of the shell.

[0018] Furthermore, a pressure-regulating valve is provided at the brine outlet. The valve comprises a pressure-regulating needle valve, a pressure-regulating spring, a limit nut, and a pressure-regulating knob. The pressure-regulating needle valve is installed in the brine flow channel, the pressure-regulating spring is mounted on the pressure-regulating needle valve, and the pressure-regulating knob is connected to the outer end of the pressure-regulating needle valve to compress the pressure-regulating spring. The limit nut is used to determine the on / off state of the pressure-regulating valve. After the pressure regulation test is completed, the nut is positioned in the normally open state, and the pressure-regulating needle valve seals the brine flow channel, i.e., the closed state.

[0019] Furthermore, the base assembly is equipped with a reverse osmosis pressure test port. This port connects to a pressure tester, allowing real-time monitoring of the device's reverse osmosis pressure and fluctuations. The acquired parameters serve as a reference for adjusting the tightness of the pressure regulating valve. The appropriate reverse osmosis pressure range is determined by the membrane element's performance, while the permissible reverse osmosis pressure fluctuation range is determined by the device's system design, including its energy storage and pressure stabilization capabilities. Fine-tuning the pressure regulating valve corrects for performance variations within each device.

[0020] Furthermore, the shell is a cylindrical structure with a length of 160-200 mm, an outer diameter of 55-65 mm, and a weight of 500-1000 g.

[0021] Beneficial effects

[0022] In the device described in the present invention, the reverse osmosis membrane element and the isobaric double-acting pump cooperate to form pressure accumulation and transmission. Seawater in the pressure-driven device flows in a directional manner. When the threshold pressure is reached, the seawater separates the solvent water from the solute ions at the reverse osmosis membrane interface. The device does not store seawater or fresh water, but only separates fresh water and brine. It meets the normal operating requirements of the reverse osmosis membrane under ultra-micro conditions. The central tube serves three purposes: it is used to roll the reverse osmosis membrane, reverse osmosis desalination of seawater, and collection of fresh water; it also serves as the pressure-resistant housing of the isobaric double-acting pump, which boosts the seawater into the membrane element, separates the soluble ions in the seawater, and generates fresh water. The device minimizes its size and is manually driven, with a driving force of approximately 3 kilograms and a power consumption of 15 to 25 watts. It is energy-saving, environmentally friendly, portable, and reliable, and desalinated seawater is made into drinking water that meets drinking water standards. The device can produce more than 1,000 milliliters of fresh water per hour, meeting emergency life-saving needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1-2 This is a schematic structural diagram of the ultra-micro portable seawater desalination device of the present invention;

[0024] Figure 3-4 This is a schematic diagram of the partial structure of the ultra-micro portable seawater desalination device of the present invention;

[0025] Figure 5 A diagram showing the relationship between push-pull force, reverse osmosis pressure, brine output, and fresh water generated when the device of the present invention is used;

[0026] Among them, 1-shell, 2-reverse osmosis membrane element, 3-isobaric double-acting pump, 4-handle push-pull drive assembly, 5-base assembly, 6-ultrafilter, 7-fresh water tank, 8-energy storage pressurization tank, 9-water inlet tank, 10-pressure tank, 11-pressurization seal, 12-primary filter, 21-reverse osmosis membrane, 22-center tube, 31-water inlet check valve, 32-piston, 33-piston pressure tube, 34-piston sleeve, 35-check valve, 36-energy storage pressure stabilizer, 41-handle pressure rod, 42-rotating button, 43-rotating part, 44-rotating shaft, 45-positioning push rod, 51-seawater inlet interface, 52-fresh water outlet interface, 53-brine outlet interface, 54-pressure regulating valve, 55-reverse osmosis pressure test interface. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to specific embodiments.

[0028] like Figure 1-4 As shown, an ultra-micro portable seawater desalination device includes a housing 1, a reverse osmosis membrane element 2, an isobaric double-acting pump 3, a handle push-pull drive assembly 4, a base assembly 5, an ultrafilter 6 and a pre-filter 12;

[0029] The reverse osmosis membrane element 2 includes a central tube 22 and a reverse osmosis membrane 21 located on the outer wall of the central tube; the reverse osmosis membrane element 2 is mounted in the housing 1 via a pressurized seal 11, and a pressure chamber 10 is formed between the reverse osmosis membrane element 2 and the housing (1);

[0030] The shell 1 and the center tube 22 are made of materials that can withstand pressures above 3 MPa;

[0031] The isobaric double-acting pump 3 includes a water inlet check valve 31, a non-return check valve 35, a piston 32, a piston pressure pipe 33 and a piston sleeve 34; the water inlet check valve 31 and the non-return check valve 35 are fixedly sealed with the center pipe 22, and the water inlet check valve 31 is located below the non-return check valve 35, and a water inlet tank 9 is formed between the non-return check valve 35 and the water inlet check valve 31; the piston sleeve 34 is located in the housing 1 and fixedly sealed above the center pipe 22, the piston pressure pipe 33 is fixed in the piston sleeve 34, and the piston 32 passes through the piston pressure pipe 33 and passes through The guide positioning part cooperates with the piston pressure tube 33, one end of the piston 32 is connected to the valve core of the non-return one-way valve 35, and the other end is movably connected to the handle push-pull drive assembly 4, and the handle push-pull drive assembly 4 drives the piston 32 to move up and down; the piston pressure tube 33 is circumferentially opened with a seawater outlet hole I, and the piston sleeve 34 is provided with an annular energy storage and pressure chamber 8, and the energy storage and pressure chamber 8 is provided with an energy storage stabilizer 36, and the bottom of the energy storage and pressure chamber 8 is evenly distributed with seawater outlet holes II; the energy storage stabilizer 36 stores energy and stabilizes pressure by the function of pressurizing and contracting and decompressing and expanding.

[0032] The ultrafilter 6 is located in the central tube 22 below the water inlet check valve 31. A fresh water tank 7 is formed between the ultrafilter 6 and the central tube 22. Fresh water outlet holes are evenly distributed on the inner wall of the central tube 22 below the water inlet check valve 31.

[0033] The base assembly 5 is located at the bottom of the shell 1 and is fixedly sealed with the reverse osmosis membrane element 2. The base assembly 5 is provided with a seawater inlet interface 51, a fresh water outlet interface 52 and a brine outlet interface 53; one end of the seawater inlet interface 51 is connected to the primary filter 12 through an inlet pipe, and the other end is connected to the inlet of the ultrafilter 6 through a pipeline; the outlet of the ultrafilter 6 is connected to the water inlet check valve 31 through a pipeline; a fresh water flow channel is formed between the fresh water outlet interface 52 and the fresh water tank, and the fresh water outlet interface 52 is connected to the fresh water outlet pipe, and a brine flow channel is formed between the brine outlet interface 53 and the reverse osmosis membrane 21, and the brine outlet interface 53 is connected to the brine outlet pipe.

[0034] During use, when the handle push-pull drive assembly 4 drives the piston 32 to move upward, the water inlet tank 9 reduces pressure. When it is less than atmospheric pressure, the non-return one-way valve 35 is closed, the water inlet one-way valve 31 is opened, and the seawater enters the ultrafilter 6 through the seawater inlet interface 51 through the primary filter 12 and enters the water inlet tank 9 after ultrafiltration; when the handle push-pull drive assembly 4 drives the piston 32 to move downward, the water inlet tank 9 is pressurized. When it is higher than atmospheric pressure, the water inlet one-way valve 31 is closed, the non-return one-way valve 35 is opened, and the pressurized seawater enters the energy storage pressure tank 8 through the seawater outlet hole I on the piston pressure pipe 33; when the pressurized seawater reaching the threshold flows into the outer layer of the membrane assembly from the seawater outlet hole II at the bottom of the energy storage pressure tank 8 through the pressure tank 10, part of the fresh water seeps into the reverse osmosis membrane 21, and the fresh water accumulated in the inner layer of the reverse osmosis membrane 21 flows out from the fresh water outlet hole on the central tube 22 through the fresh water tank, the fresh water flow channel, and the fresh water outlet interface. The salt content of seawater along the outer layer of the reverse osmosis membrane 21 increases and the water content decreases, forming brine which is discharged from the brine flow channel through the brine outlet interface 53 .

[0035] The reverse osmosis membrane 21 utilizes a graphene oxide membrane with controllable interlayer spacing, as described in Chinese Patent No. 201610575159.5. The reverse osmosis membrane 21 is wound around the outer wall of the central tube 22. The graphene oxide membrane with controllable interlayer spacing can also lower the operating pressure threshold of reverse osmosis, or increase the desalination rate and freshwater output rate at the same pressure.

[0036] The central tube 22 is made of a high-compressive-strength, low-density material described in Chinese patent application 202010490153.4. The material is resistant to corrosion at 10 MPa pressure and 35,000 ppm concentrated seawater, and is lightweight and wear-resistant.

[0037] Furthermore, the central tube 22 doubles as the housing for the isobaric double-acting pump 3 and the ultrafilter 6. The isobaric double-acting pump 3 is housed in the upper portion of the central tube 22, while the ultrafilter 6 is housed in the lower portion. A freshwater reservoir 7 is formed between the central tube 22 and the ultrafilter 6. Central tube 22 serves three functions in one, physically integrating the three essential functions of a seawater desalination system: a pressure pump (power), source water pretreatment (ultrafiltration), and freshwater collection.

[0038] The handle push-pull drive assembly 4 includes a handle pressure rod 41, a rotating member 43 and a rotating shaft 44; the rotating member 43 is movably connected to the handle pressure rod 41 and the piston 32 respectively through the rotating shaft 44, and a spring positioning column 46 is provided between the rotating member 43 and the handle pressure rod 41 along the pressing direction; a rotating button 42 is provided on the handle pressure rod 41, and the rotating button 42 cooperates with the rotating member 43 through a positioning push rod 45 to put the handle pressure rod 41 in a working or non-working state; in the working state, pressing the handle pressure rod 41 drives the piston 32 to move up and down.

[0039] The handle push-pull drive assembly 4 further includes a cover 47 , a handle pressure rod sliding groove is formed on the cover 47 , and the cover 47 is fixed to the housing 1 .

[0040] The primary filter 12 is a semicircular structure that matches the outer wall of the shell.

[0041] A pressure-regulating valve 54 is installed at the brine outlet port 53. The valve comprises a pressure-regulating needle valve, a pressure-regulating spring, a limit nut, and a pressure-regulating knob. The pressure-regulating needle valve is installed in the brine flow channel, the pressure-regulating spring is mounted on the needle valve, and the pressure-regulating knob is connected to the outer end of the needle valve to compress the pressure-regulating spring. The limit nut is used to position the pressure-regulating valve 54 in the open and closed state. After the pressure regulation test is completed, the nut is positioned in the normally open state, and the pressure-regulating needle valve seals the brine flow channel, i.e., in the closed state.

[0042] The base assembly 5 is equipped with a reverse osmosis pressure test port 54. Connecting to a pressure tester, this port provides real-time monitoring of the device's reverse osmosis pressure and fluctuations. The acquired parameters serve as a reference for adjusting the tightness of the pressure regulating valve. The appropriate reverse osmosis pressure range is determined by the membrane element's performance, while the permissible reverse osmosis pressure fluctuation range is determined by the device's system design and energy storage and pressure stabilization capabilities. Fine-tuning the pressure regulating valve corrects for performance variations within each device.

[0043] The housing 1 is a cylindrical structure with a length of 160-200 mm, an outer diameter of 55-65 mm, and a weight of 500-1000 g. The specific values ​​are determined by the technical indicators specified by the demander.

[0044] Specific use process:

[0045] 1. Negative Pressure Water Suction: Pressing handle lever 41 moves piston 32 upward, reducing pressure in the pump chamber. When the pressure in the pump chamber falls below atmospheric pressure, the inlet check valve 31 opens and the non-return check valve 35 closes. Seawater, at atmospheric pressure, passes through pre-filter 6, ultrafilter 12, and the inlet valve and is drawn into the pump chamber. After filling the pump chamber, seawater enters energy storage and pressure stabilization chamber 8 through seawater outlet port I, and then enters pressure chamber 10 through seawater outlet port II. This negative pressure water suction, water accumulation, and pressurization cycle lasts 0.5-1.0 seconds.

[0046] 2. Positive-pressure pumping: Lift handle lever 41, and piston 32 moves downward, increasing the pressure in the pump chamber. When the pressure in the pump chamber exceeds atmospheric pressure, inlet check valve 31 closes, and check valve 35 opens. Seawater in the pump chamber flows through seawater outlet port I and accumulates in energy storage and pressure stabilization chamber 8. It then flows through seawater outlet port II and into pressure chamber 10. This positive-pressure pumping cycle lasts approximately 0.5-1.0 seconds.

[0047] 3. Increase water pressure. The water pressure in the device is determined by the resistance of the device. The push and pull force of the human arm first overcomes mechanical friction, then overcomes the water resistance of the device. When the accumulated water resistance reaches 4 MPa, the reverse osmosis membrane threshold is reached, and the device enters operation. At this point, the separated fresh water enters the reverse osmosis membrane cavity, accumulates in the fresh water tank 7 through the fresh water outlet, and flows out of the fresh water outlet port 52 along the fresh water flow channel. The remaining brine is discharged from the device through the pressure regulating valve 54.

[0048] 4. Water resistance is mainly set by the pressure regulating valve 54 at the brine outlet interface. The pressure regulating valve 54 acts like a water storage dam on the river. When the threshold is high (the dam is high), the amount of brine flowing into the water is small and the quality of fresh water is poor. When the threshold is low (the dam is low), the amount of brine flowing out is large and the quality of fresh water is good.

[0049] The medium-pressure double-acting pump in this device has a slender and long structure, so that the pump body is placed in the central tube of the membrane. It pushes and pulls water once and pumps water at a secondary pressure, while increasing and stabilizing the pressure. This double-acting function increases the reverse osmosis pressure of the membrane steadily to the working range of 4MP to 6MPa, and the pressure fluctuation is less than 10%, allowing the membrane element to normally separate ions in seawater under the best working conditions and obtain high-quality and high-quantity fresh water.

[0050] like Figure 5 As shown in the middle curve A, the device is driven by human push and pull, with a force of 3-4 kg. The push and pull frequency is 30-50 times per minute on average, 60 times per minute at startup to accelerate pressurization, and 30 times per minute during operation to maintain pressure.

[0051] like Figure 5 As shown in curve B, the device can generate 4 MPa of reverse osmosis pressure within 3 minutes, allowing the reverse osmosis membrane to enter normal operating conditions. The reverse osmosis membrane pressure fluctuation is within plus or minus 10%, indicating good water quality. The reverse osmosis membrane fluctuation is controlled by the energy storage stabilizer.

[0052] This device sets the ratio of 80% brine flow and 20% fresh water flow to achieve the balance point of fresh water quantity and quality. Figure 5 As shown in the middle curve C, 80 ml of brine is discharged per minute. Figure 5 As shown in the middle curve D, 20 ml of fresh water is produced per minute, which is the optimal balance between water quality and water quantity. This device produces 1200 ml of fresh water per hour, and the water quality meets the national drinking water hygiene standards.

[0053] This device uses innovative integration of membrane and pump to achieve the smallest, lightest and most comprehensive ultra-micro device.

[0054] In summary, the invention includes but is not limited to the above embodiments. Any equivalent replacement or partial improvement made under the spirit and principle of the present invention shall be deemed to be within the scope of protection of the present invention.

Claims

1. An ultra-micro portable seawater desalination device, characterized by: It comprises a housing (1), a reverse osmosis membrane element (2), an isobaric double-acting pump (3), a handle push-pull drive assembly (4), a base assembly (5), an ultrafilter (6) and a pre-filter (12); The reverse osmosis membrane element (2) comprises a central tube (22) and a reverse osmosis membrane (21) located on the outer wall of the central tube; the reverse osmosis membrane element (2) is sheathed in the housing (1) via a pressurized seal (11), and a pressure chamber (10) is formed between the reverse osmosis membrane element (2) and the housing (1); The shell (1) and the center tube (22) are both made of materials that can withstand a pressure of more than 3 MPa; The isobaric double-acting pump (3) comprises a water inlet check valve (31), a non-return check valve (35), a piston (32), a piston pressure pipe (33) and a piston sleeve (34); the water inlet check valve (31) and the non-return check valve (35) are both fixedly sealed with the central tube (22), and the water inlet check valve (31) is located below the non-return check valve (35), and a water inlet chamber (9) is formed between the non-return check valve (35) and the water inlet check valve (31); the piston sleeve (34) is located in the housing (1) and fixedly sealed above the central tube (22), and the piston pressure pipe (33) is fixed to the piston sleeve (34). ), the piston (32) passes through the piston pressure tube (33) and cooperates with the piston pressure tube (33) through a guide positioning member, one end of the piston (32) is connected to the valve core of the non-return one-way valve (35), and the other end is movably connected to the handle push-pull drive assembly (4), and the handle push-pull drive assembly (4) drives the piston (32) to move up and down; a seawater outlet hole I is opened on the circumference of the piston pressure tube (33), an annular energy storage pressure chamber (8) is provided in the piston sleeve (34), an energy storage pressure regulator (36) is provided in the energy storage pressure chamber (8), and seawater outlet holes II are uniformly distributed on the bottom of the energy storage pressure chamber (8); The ultrafilter (6) is located in the central tube (22) below the water inlet check valve (31), a fresh water tank (7) is formed between the ultrafilter (6) and the central tube (22), and fresh water outlet holes are uniformly distributed on the inner wall of the central tube (22) below the water inlet check valve (31); The base assembly (5) is located at the bottom of the shell (1) and is fixedly sealed with the reverse osmosis membrane element (2). The base assembly (5) is provided with a seawater inlet interface (51), a freshwater outlet interface (52) and a brine outlet interface (53); one end of the seawater inlet interface (51) is connected to the primary filter (12) through an inlet pipe, and the other end is connected to the inlet of the ultrafilter (6) through a pipeline; the outlet of the ultrafilter (6) is connected to the inlet check valve (31) through a pipeline; a freshwater flow channel is formed between the freshwater outlet interface (52) and the freshwater tank, the freshwater outlet interface (52) is connected to the freshwater outlet pipe, a brine flow channel is formed between the brine outlet interface (53) and the reverse osmosis membrane (21), and the brine outlet interface (53) is connected to the brine outlet pipe; The central tube (22) also serves as the outer shell of the isobaric double-acting pump (3) and the ultrafilter (6); A pressure regulating valve (54) is provided at the brine water outlet interface (53), and the pressure regulating valve comprises a pressure regulating needle valve, a pressure regulating spring, a limit nut and a pressure regulating knob. The pressure regulating needle valve is installed on the brine flow channel, the pressure regulating spring is sleeved on the pressure regulating needle valve, and the pressure regulating knob is connected to the outer end of the pressure regulating needle valve to compress the pressure regulating spring; the limit nut is used to position the switch state of the pressure regulating valve (54); after the pressure regulation test is appropriate, the nut is positioned in a normal open state, and the pressure regulating needle valve closes the brine channel, that is, it is in a closed state.

2. The ultra-micro portable seawater desalination device according to claim 1, characterized in that: The handle push-pull drive assembly (4) comprises a handle pressure rod (41), a rotating member (43) and a rotating shaft (44); the rotating member (43) is movably connected to the handle pressure rod (41) and the piston (32) via the rotating shaft (44), and a spring positioning column (46) is provided between the rotating member (43) and the handle pressure rod (41) along the pressing direction; a rotating button (42) is provided on the handle pressure rod (41), and the rotating button (42) cooperates with the rotating member (43) via a positioning push rod (45) to put the handle pressure rod (41) into a working or non-working state; in the working state, pressing the handle pressure rod (41) drives the piston (32) to move up and down.

3. The ultra-micro portable seawater desalination device according to claim 1, characterized in that: The handle push-pull drive assembly (4) further comprises a cover body (47), a handle pressure rod sliding groove is formed on the cover body (47), and the cover body (47) is fixed to the housing (1).

4. The ultra-micro portable seawater desalination device according to claim 1, characterized in that: The primary filter (12) is a semicircular sheet structure that matches the outer wall of the shell.

5. The ultra-micro portable seawater desalination device according to claim 1, characterized in that: The base assembly (5) is also provided with a reverse osmosis pressure test interface (55).

6. The ultra-micro portable seawater desalination device according to claim 1, characterized in that: The shell (1) is a cylindrical structure; the length of the device is 150-200 mm, the outer diameter is 50-65 mm, and the weight is 500-1000 g.

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