Primary high pressure pump, reverse osmosis mechanism and seawater edible salt system

Abstract

The application provides a primary high-pressure pump, a reverse osmosis mechanism and a seawater edible salt system, wherein the primary high-pressure pump adopts a plunger to pressurize seawater, that is, the pump is a displacement pump, and a servo motor is used to drive the plunger. The displacement pump has the advantages of large and stable flow, high energy utilization efficiency, compact structure and easy realization of precise control. The servo motor is smaller in size than a traditional asynchronous motor and can realize high-precision control. Therefore, the primary high-pressure pump is significantly smaller in size under the premise of maintaining ideal flow, and can realize fast and accurate response when the system working condition changes, so that the water quality output by the reverse osmosis module is stable, which is beneficial to stably and efficiently producing edible salt. In addition, a flow guide component is sleeved on the plunger, which can guide fresh water to the outer circumferential surface of the plunger, so that the plunger can be lubricated and cooled by the fresh water, thereby avoiding the problem of microcrystalline particles when seawater is used, causing wear of the plunger and other components.

Description

Technical Field

[0001] This invention belongs to the field of high-pressure liquid pump technology, specifically relating to a primary high-pressure pump, a reverse osmosis mechanism, and a seawater-to-edible salt system. Background Technology

[0002] Traditional methods for producing sea salt include boiling, sun-drying, and spray evaporation. Boiling is typically only suitable for industrial salt production and consumes a large amount of electricity. Sun-drying is suitable for edible salt production but requires a large area and high labor costs, has a long production cycle, is greatly affected by weather conditions, and has unstable output. Spray evaporation is also energy-intensive and requires a large area. Therefore, a new seawater-to-edible salt production system is needed to produce edible salt from seawater in a more energy-efficient and effective manner.

[0003] Existing technologies include membrane-based freshwater production systems. These systems typically involve collecting seawater, filtering it, and then treating it via reverse osmosis. After passing through the reverse osmosis membrane, the seawater is separated into freshwater and concentrated wastewater. However, due to the use of chemical flushing during system operation, the resulting concentrated wastewater cannot be used for salt production. This inventor has improved upon this membrane-based freshwater production system to create a seawater-to-salt system. Considering the convenience of practical deployment, the system is integrated into a container. This requires a primary high-pressure pump to pressurize the seawater, working in conjunction with the reverse osmosis membrane. However, the primary high-pressure pump used in this integrated seawater-to-salt system has several requirements, which currently cannot be met by commercially available high-pressure pumps. These requirements include the following:

[0004] Firstly, since the system is integrated into the space of a container, the space is very limited, which necessitates miniaturized high-pressure pumps. On the other hand, noise and vibration need to be minimized in such a small space. Existing high-pressure pumps used in such large systems typically use asynchronous or variable frequency motors, which occupy a large area and have high motor speeds, resulting in significant noise and vibration. Meanwhile, small pumps are insufficient to meet flow requirements.

[0005] Secondly, seawater-to-salt systems require long-term, even 24 / 7, operation. During this extended period, the operating conditions of the high-pressure pump constantly change due to variations in the raw seawater quality and the clogging of the reverse osmosis membranes at each stage. To ensure the stability of the concentrated brine produced after reverse osmosis, the high-pressure pump needs to be adjusted according to these conditions. Existing high-pressure pumps typically use asynchronous or variable frequency motors, which make it difficult to accurately adjust the output liquid pressure and result in high energy consumption during long-term operation.

[0006] Third, the high-pressure pump needs to pressurize seawater, meaning that seawater flows inside the pump. Seawater will corrode the components of the high-pressure pump, and under the influence of pressure and other factors, salt and other components in the seawater will form microcrystals that precipitate out, causing wear on the components and affecting the stability of the pump's operation and its service life.

[0007] Therefore, in order to ensure that the new seawater salt production system can operate stably for a long time and achieve a stable and ideal seawater concentration effect, it is necessary to design a new type of high-pressure pump for this new system. Summary of the Invention

[0008] This invention was made to solve at least one of the above-mentioned problems, and its purpose is to provide a single-stage high-pressure pump that can operate stably for a long time in a seawater environment, has a large flow rate, and is relatively compact, a reverse osmosis mechanism using the high-pressure pump, and a seawater salt production system including the reverse osmosis mechanism. The technical solution adopted by this invention is as follows:

[0009] This invention provides a first-stage high-pressure pump, installed in at least the first-stage reverse osmosis module of a seawater-to-salt production system, for pressurizing seawater. The first-stage high-pressure pump comprises: a hydraulic end for pressurizing the seawater; a power end for providing power to the hydraulic end; and a pump drive mechanism including a servo motor for driving the power end. The hydraulic end includes: a hydraulic end valve box having independent seawater and freshwater channels; a plunger reciprocatingly disposed in the hydraulic end valve box for pressurizing the seawater in the seawater channels; and a flow guiding component sleeved on the plunger, having a flow guiding channel communicating with the freshwater channel for guiding freshwater from the freshwater channel to the outer circumferential surface of the plunger, thereby lubricating and cooling the plunger.

[0010] The first-stage high-pressure pump provided by the present invention may also have the following technical features, wherein the freshwater channel includes: a freshwater inlet channel extending to one side of the hydraulic end valve box and communicating with the outside, for guiding freshwater into the guide groove; and a drainage airflow channel extending to the top of the hydraulic end valve box and communicating with the outside, for discharging the freshwater and air. The guide component is annular, with annular grooves on its outer and inner circumferences, and multiple guide holes inside communicating with the outer annular groove and the inner annular groove. The annular groove on the outer circumference communicates with the freshwater inlet channel and the drainage airflow channel, respectively, and the annular groove on the inner circumference forms an annular cavity with the outer circumferential surface of the plunger.

[0011] The primary high-pressure pump provided by this invention may also have the following technical features: the primary high-pressure pump is used to pressurize the seawater to 5 MPa to 7 MPa. The plunger is cylindrical with a diameter of 20 mm to 40 mm. The wall thickness of the hydraulic end valve box is 3 mm to 10 mm. The pump drive mechanism further includes a reduction gearbox, and the servo motor drives the power end through the reduction gearbox. The servo motor has a rotational speed of 1500 r / min, and the reduction ratio of the reduction gearbox is 3 to 5.

[0012] The first-stage high-pressure pump provided by the present invention may also have the following technical features: the power end has a power output component for driving the plunger to reciprocate; one end of the plunger has a flange; the hydraulic end further includes a floating connection assembly, which includes: a connecting component, one end of which is fixed to one end of the power output component, and the other end has a receiving groove, the middle part of the bottom surface of the receiving groove being spherical; a positioning component, sleeved on the end of the plunger with the flange and the connecting component; and a driving component, disposed at the opening of the receiving groove, for driving the plunger to move when the power output component moves in a direction away from the plunger; the hydraulic end has a cavity for accommodating the floating connection assembly and a gas channel communicating with the cavity.

[0013] The first-stage high-pressure pump provided by this invention may also have the following technical features: the hydraulic end valve box includes a main body component and multiple covers; one side of the main body component has a low-pressure inlet, and at least one side of the main body component has a high-pressure outlet; the main body component has an inlet channel communicating with the low-pressure inlet, an outlet channel communicating with the high-pressure outlet, and multiple pressurizing channels connecting the inlet channel and the outlet channel; multiple plungers are provided, each corresponding to one of the pressurizing channels; the hydraulic end also includes multiple check valves, each check valve including an inlet valve and an outlet valve, respectively provided at both ends of each pressurizing channel; one end of each pressurizing channel forms an inlet valve maintenance opening on the side of the main body component, and the other end of each pressurizing channel forms an outlet valve maintenance opening on the top surface of the main body component; the multiple covers are detachably installed at the inlet valve maintenance opening and the outlet valve maintenance opening.

[0014] The first-stage high-pressure pump provided by the present invention may also have the following technical features: the plunger includes a plunger cylinder made of ceramic material; the hydraulic end valve box is made of stainless steel; at least the valve core of the one-way valve is made of titanium alloy; the hydraulic end valve box also has multiple mounting holes for detection components communicating with the water outlet channel, which are respectively used to install an accumulator, an electronic pressure gauge, and a mechanical pressure gauge; the accumulator is used to stabilize the water outlet pressure and has an inner cavity communicating with the water outlet channel, which is filled with inert gas.

[0015] The first-stage high-pressure pump provided by the present invention may also have the following technical features: the pump drive mechanism further includes a reduction gearbox; the servo motor drives the power end through the reduction gearbox; the reduction gearbox has an output end on at least one side and an input end on the top; the output end is connected to the power end; the servo motor is vertically mounted above the reduction gearbox; and the output end of the servo motor is connected to the input end of the reduction gearbox.

[0016] The first-stage high-pressure pump provided by the present invention may also have the following technical features: the pump drive mechanism further includes a reduction gearbox; the servo motor drives the power end through the reduction gearbox; the reduction gearbox has an input end and an output end respectively on both sides; the output end is connected to the power end; the servo motor is horizontally arranged on one side of the reduction gearbox; and the output end of the servo motor is connected to the input end of the reduction gearbox.

[0017] This invention provides a reverse osmosis mechanism installed in a seawater-to-salt production system. The mechanism comprises one or more reverse osmosis modules, wherein at least the first-stage reverse osmosis module includes: a high-pressure pump for pressurizing seawater to 5 MPa–7 MPa; and a reverse osmosis section for performing reverse osmosis treatment on the pressurized seawater, thereby separating concentrated brine from the seawater. The high-pressure pump is the aforementioned high-pressure pump.

[0018] This invention provides a seawater-to-salt system, characterized by the following technical features: a reverse osmosis mechanism for treating seawater via reverse osmosis, thereby separating concentrated brine from the seawater. The reverse osmosis mechanism is the one described above.

[0019] The role and effect of invention

[0020] According to the present invention, a primary high-pressure pump, a reverse osmosis mechanism, and a seawater salt production system are provided. The primary high-pressure pump uses a plunger to pressurize the seawater, i.e., the pump is a positive displacement pump. A servo motor is used to drive the plunger. Positive displacement pumps have advantages such as large and stable flow rate, high energy efficiency, compact structure, and easy precise control. Compared with traditional asynchronous motors, servo motors are smaller in size and can achieve high-precision control. Therefore, the primary high-pressure pump is significantly smaller in size while maintaining the ideal flow rate, and can achieve a fast and accurate response when the system operating conditions change, thereby making the concentrated seawater output by the reverse osmosis module stable and conducive to the stable and efficient production of edible salt.

[0021] Furthermore, the plunger is also equipped with a flow guiding component, which guides fresh water to the outer circumference of the plunger through its flow channel. This allows the fresh water to lubricate and cool the plunger, avoiding the problem of microcrystals and wear on components such as the plunger that occurs when using seawater. This further extends the service life of components such as the plunger and reduces the frequency of maintenance by workers. Moreover, since this first-stage high-pressure pump is used in a seawater-to-salt production system, a large amount of fresh water will also be produced after reverse osmosis treatment. Therefore, fresh water can be easily introduced into the first-stage high-pressure pump without the need for additional fresh water treatment equipment in the system. This is an ingenious design that rationally and effectively utilizes system resources. Attached Figure Description

[0022] Figure 1 This is a perspective view of the primary high-pressure pump in Embodiment 1 of the present invention;

[0023] Figure 2 This is a cross-sectional view of the hydraulic end in Embodiment 1 of the present invention;

[0024] Figure 3 This is a perspective view of the main body component of the box in Embodiment 1 of the present invention;

[0025] Figure 4 This is a cross-sectional schematic diagram of the one-way valve in Embodiment 1 of the present invention;

[0026] Figure 5 yes Figure 2 Enlarged view of the inner part of frame A;

[0027] Figure 6 This is a perspective view of the flow guiding component in Embodiment 1 of the present invention;

[0028] Figure 7 This is a cross-sectional view of the power end in Embodiment 1 of the present invention;

[0029] Figure 8 This is a three-dimensional representation of the maintenance status of the primary high-pressure pump in Embodiment 1 of the present invention. Figure 1 ;

[0030] Figure 9 This is a three-dimensional representation of the maintenance status of the primary high-pressure pump in Embodiment 1 of the present invention. Figure 2 ;

[0031] Figure 10 This is a perspective view of the primary high-pressure pump in Embodiment 2 of the present invention;

[0032] Figure 11 This is a perspective view of the primary high-pressure pump in a modified embodiment of the present invention.

[0033] Figure label:

[0034] 71. High-pressure pump; fixed base; support foot; hydraulic end; hydraulic end valve box; main body component; box connection component; cover; cover sealing assembly; inlet channel; low-pressure inlet; outlet channel; high-pressure outlet; pressurized channel; outlet valve inspection opening; inlet valve inspection opening; plunger moving chamber; 71214.

[0035] Freshwater inlet channel 71215; freshwater inlet 71215a; exhaust gas channel 71216; exhaust gas outlet 71216a;

[0036] Plunger 7122; Plunger cylinder 71221; Plunger fixing component 71222; Plunger base component 71223; Flange 71223a; Check valve 7123; Inlet valve 7123A; Outlet valve 7123B; Valve cover 71231; Valve seat 71232; Valve core 71233; Return spring 71234; Floating connection assembly 7124; Connecting component 71241; Threaded connection hole 71241a; Receiving groove 71241b; Mounting groove 71241c; Positioning component 71242; Air hole 71242a; Spherical component 71243; First driving component 71244; Second driving component 71245; High-pressure sealing assembly 71251; Low-pressure sealing assembly 71252; Flow guiding component 7126; Outer circumferential groove 71261; Inner circumferential groove 71262; Flow guiding hole 71263; Power end 713; Power end valve box 7131; Crankshaft 7132; Connecting rod 7133; Pump drive mechanism 714; Servo motor 7141; Gearbox 7142; Accumulator 7151; Electronic pressure gauge 7152; Mechanical pressure gauge 7153. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of the present invention easy to understand, the following describes in detail the first-stage high-pressure pump, reverse osmosis mechanism and seawater salt production system of the present invention with reference to embodiments and accompanying drawings.

[0038] <Example 1>

[0039] This embodiment provides a high-pressure pump installed in a seawater-to-salt production system. The system is housed in a container and includes a clean seawater acquisition device and a concentrated brine acquisition device.

[0040] The clean seawater acquisition device is used to pre-treat the input raw seawater by filtering, so that it becomes clean seawater with basically unchanged salinity but lower turbidity, and then supplies the clean seawater to the concentrated brine acquisition device.

[0041] The concentrated brine extraction device includes a reverse osmosis mechanism and a concentrated brine output mechanism. The reverse osmosis mechanism includes one or more reverse osmosis modules. Each reverse osmosis module includes a high-pressure pump and a reverse osmosis section (reverse osmosis membrane). The high-pressure pump is used to pressurize the seawater entering the reverse osmosis membrane, thereby utilizing the membrane structure of the reverse osmosis membrane and the pressure difference across it to separate water molecules from salt and other impurities, obtaining separated fresh water and concentrated seawater (also known as concentrated brine). At least the high-pressure pump in the first-stage reverse osmosis module is the first-stage high-pressure pump provided in this embodiment.

[0042] The structure of the first-stage high-pressure pump will be described in detail below.

[0043] Figure 1 This is a three-dimensional view of the first-stage high-pressure pump in this embodiment.

[0044] like Figure 1 As shown, the first-stage high-pressure pump 71 includes a fixed base 711, a hydraulic end 712, a power end 713, and a pump drive mechanism 714.

[0045] The fixed base 711 is roughly in the shape of a cuboid platform, and the hydraulic end 712, the power end 713, and the pump drive mechanism 714 are all fixed on the fixed base 711. The bottom of the fixed base 711 has multiple support feet 7111, which can be made of elastic material to provide a certain vibration damping effect.

[0046] The hydraulic end 712 is used to input seawater, pressurize it, and output pressurized seawater to the reverse osmosis section (e.g., a reverse osmosis membrane).

[0047] Figure 2 This is a cross-sectional view of the hydraulic end in this embodiment.

[0048] like Figure 1 and Figure 2 As shown, the hydraulic end 712 includes a hydraulic end valve box 7121, multiple plungers 7122, multiple check valves 7123, multiple floating connection assemblies 7124, multiple sets of plunger sealing assemblies 7125, and multiple flow guiding components 7126.

[0049] Figure 3is a perspective view of the box main body component in the present embodiment.

[0050] As shown in Figures 1 to 3 , the hydraulic end valve box 7121 includes a box main body component 7121A, a box connection component 7121B, a plurality of cover members 7121C, and a plurality of cover sealing assemblies 7121D.

[0051] The box main body component 7121A is generally in a rectangular parallelepiped shape as a whole. The box connection component 7121B is generally in a trapezoidal block shape as a whole, and its width and height are respectively smaller than the width and height of the box main body component 7121A. The box connection component 7121B is disposed between the box main body component 7121A and the front end of the power end 713, and the three are fixedly connected by a plurality of long screws. The plurality of cover members 7121C and the plurality of cover sealing assemblies 7121D are respectively disposed at a plurality of openings on the box main body component 7121A, for sealing and shielding each of the openings.

[0052] A seawater passage and a freshwater passage that are independent of each other, as well as a plurality of plunger movable cavities, are formed inside the hydraulic end valve box 7121.

[0053] The seawater passage includes a water inlet flow passage 71211, a water outlet flow passage 71212, and a plurality of pressurization flow passages 71213.

[0054] The water inlet flow passage 71211 extends and penetrates along the length direction of the hydraulic end valve box 7121, and is located at the lower part of the hydraulic end valve box 7121. It has a circular cross section, and its two ends are two low-pressure water inlets 71211a respectively located at the lower parts of both sides of the hydraulic end valve box 7121.

[0055] The water outlet flow passage 71212 extends and penetrates along the length direction of the hydraulic end valve box 7121, and is located at the upper part of the hydraulic end valve box 7121. It has a circular cross section, and its two ends are respectively two high-pressure water outlets 71212a located at the upper parts of both sides of the hydraulic end valve box 7121. The diameter of the high-pressure water outlet 71212a is smaller than the diameter of the low-pressure water inlet 71211a. The high-pressure water outlet 71212a can be connected to the water inlet of the reverse osmosis membrane of the corresponding stage through a corresponding pipeline.

[0056] The plurality of pressurization flow passages 71213 are respectively configured to cooperate with corresponding plungers and one-way valves to realize pressurization of seawater. Each pressurization flow passage 71213 is in an inverted T shape, the upper end thereof communicates with the water outlet flow passage 71212, one lower end thereof communicates with the water inlet flow passage 71211, the upper end communicates with the outside to form a circular outlet valve maintenance opening 71213a on the upper surface of the hydraulic end valve box 7121, and the other lower end also communicates with the outside to form a circular inlet valve maintenance opening 71213b on the front end surface of the hydraulic end valve box 7121.

[0057] The plunger movable cavity 71214 is used to house the plunger, which extends along the width direction of the hydraulic end valve box 7121. Its cross-section is circular, one end of which is connected to the middle of the corresponding pressurized flow channel 71213, and the other end is connected to the outside. The other end has a multi-stage stepped structure.

[0058] The freshwater channel is used in conjunction with the flow guiding component to achieve freshwater lubrication and cooling of the plunger. It includes multiple freshwater inlet channels 71215 and multiple exhaust channels 71216.

[0059] The freshwater inlet channel 71215 extends along the length of the hydraulic end valve box 7121, from one side of the hydraulic end valve box 7121 to near the plunger moving chamber 71214. One end of the freshwater inlet is the freshwater inlet 71215a located on one side of the hydraulic end valve box 7121. The cross-section of the freshwater inlet channel 71215 is circular, and its diameter is significantly smaller than that of the seawater channel.

[0060] The drain gas passage 71216 extends along the height of the hydraulic end valve box 7121, extending downward from the upper surface of the hydraulic end valve box 7121 to near the plunger moving chamber 71214. The cross-section of the drain gas passage 71216 is circular, and its diameter is close to that of the fresh water inlet passage 71215. One end of it is the drain gas port 71216a located on the upper surface of the hydraulic end valve box 7121.

[0061] Since the seawater salt production system also produces a large amount of fresh water through reverse osmosis, this fresh water can be used for plunger lubrication and cooling. For example, the system may include a fresh water tank for storing fresh water, a fresh water inlet 71215a connected to the outlet of the fresh water tank via a pipe, and a vent 71216a connected to a drain trough via a pipe, etc.

[0062] The plunger 7122 is generally cylindrical and is reciprocatingly disposed in the plunger movable cavity 71214. The plunger 7122 includes a plunger cylinder 71221, a plunger fixing member 71222, and a plunger base member 71223.

[0063] The plunger cylinder 71221 is a hollow cylindrical shape with an axially penetrating mounting hole in the middle.

[0064] The plunger base component 71223 is floatingly connected to the power output component of the power end 713 via a floating connection assembly 7124. One end of the plunger base component 71223 has a flange 71223a, and the other end is stepped with a threaded hole in the center. The plunger fixing component 71222 is a fixing bolt that passes through the plunger cylinder 71221. One end of its bolt is threaded to the plunger base component 71223, and its nut is located outside one end of the plunger cylinder 71221, abutting against the outer end face of that end, thereby fixing the plunger cylinder 71221. The outer end face of the plunger base component 71223 is a plane, and this plane is perpendicular to the axial direction of the plunger 7122.

[0065] In this embodiment, there are three plungers 7122, and correspondingly three pressurized flow channels 71213 and three plunger moving chambers 71214. The three plungers 7122 are arranged at equal intervals along the length of the hydraulic end valve box 7121. During operation, the three plungers 7122 reciprocate in an alternating manner.

[0066] The one-way valve 7123 is used in conjunction with the plunger 7122 to pressurize seawater.

[0067] Figure 4 This is a cross-sectional view of the check valve in this embodiment.

[0068] like Figure 4 As shown, the one-way valve 7123 includes a valve cover 71231, a valve seat 71232, a valve core 71233, and a return spring 71234.

[0069] The valve cover 71231 has a frustum-shaped cone at one end and is roughly cylindrical in the rest. The valve cover 71231 has a through hole extending along its axial direction and multiple side openings on its side.

[0070] Valve seat 71232 is fixed to one cylindrical end of valve cover 71231. Valve seat 71232 also has a through hole extending along its axial direction, and the diameter of the through hole is larger than the diameter of the through hole on valve cover 71231. The outer circumference of one end of valve seat 71232 has an annular groove for installing a sealing ring.

[0071] The valve core 71233 is generally disc-shaped, with a protrusion at one axial end for limiting the spring. One end of the return spring 71234 is sleeved on the protrusion and abuts against the surface of the valve core 71233, while the other end is embedded in a circular groove inside the valve cover 71231.

[0072] like Figure 3As shown, a portion of the one-way valve 7123 is installed as an inlet valve 7123A at one end of the pressurized flow channel 71213 near the inlet flow channel 71211. The axial direction of the inlet valve 7123A is consistent with the length direction of the main body component 7121A. Its valve seat 71232 faces the inlet flow channel 71211, and one end of the valve cover 71231 faces the inlet valve maintenance opening 71213b.

[0073] Another one-way valve 7123, as the outlet valve 7123B, is located at one end of the pressurized flow channel 71213 near the outlet flow channel 71212. The axial direction of the outlet valve 7123B is consistent with the height direction of the main body component 7121A. Its valve seat 71232 faces the middle of the pressurized flow channel 71213, and one end of the valve cover 71231 faces the outlet valve maintenance opening 71213a.

[0074] The plunger sealing assembly is used to seal the space between the plunger 7122 and the plunger movable cavity 71214 to prevent seawater from entering the power end 713 through the cavity. The plunger sealing assembly includes a high-pressure sealing assembly 71251 and a low-pressure sealing assembly 71252, respectively disposed at a two-stage step at one end of the plunger movable cavity 71214, with the low-pressure sealing assembly 71252 being relatively closer to the power end 713. Furthermore, a guide ring is provided on one side of the high-pressure sealing assembly 71251 to guide the plunger 7122.

[0075] Figure 5 yes Figure 2 Enlarged view of the inner part of frame A.

[0076] like Figure 2 and Figure 5 As shown, the floating connection assembly 7124 includes a connecting component 71241, a positioning component 71242, a spherical component 71243, and a driving component.

[0077] The connecting component 71241 is generally cylindrical in shape. It has a threaded connection hole 71241a at the center of one axial end and a circular accommodating groove 71241b at the other axial end. The bottom of the accommodating groove 71241b has a further recessed circular mounting groove 71241c. The inner wall of the accommodating groove 71241b is provided with an internal thread.

[0078] The spherical component 71243 is generally in the shape of a flattened cylinder, with one axial end being a spherical surface and the other axial end being a plane perpendicular to the axis. The spherical component 71243 is fitted into the mounting groove 71241c, with its spherical surface facing the plunger.

[0079] The positioning component 71242 is generally cylindrical, with the outer diameters at both ends smaller than those at the middle. One end is fitted into one end of the plunger's movable cavity 71214, and the low-pressure sealing assembly 71252 is disposed between this end and the plunger. The other end of the positioning component 71242 is fitted into the cavity at one end of the power end 713. A movable cavity is formed within the positioning component 71242, and its inner wall has multiple annular protrusions. The positioning component 71242 is sleeved on one end of the plunger 7122 and on the connecting component 71241, with a certain gap between the outer wall of the connecting component 71241 and the inner wall of the positioning component 71242. The upper end of the positioning component 71242 has a circular through-hole 71242a, which extends along the height direction of the main body component 7121A. The box connecting component 7121B has a through hole inside that corresponds to the air hole 71242a, and can be combined with the air hole 71242a to form an airflow channel.

[0080] The driving assembly includes a first driving component 71244 and a second driving component 71245 that cooperate with each other. The first driving component 71244 is annular, with external threads on its outer circumference and a stepped ring on its inner circumference. The first driving component 71244 is threadedly connected to one end of the positioning component 71242 and is fitted onto the plunger base component 71223. The second driving component 71245 is annular and smaller than the first driving component 71244. It is fitted onto the plunger base component 71223 and located beside a flange 71223a of the plunger base component 71223.

[0081] When the power output component of the power end 713 moves toward the plunger 7122, it drives the positioning component 71242 fixed thereto to move. The positioning component 71242 pushes the spherical component 71243, and the spherical surface abuts against the bottom surface of the plunger and pushes the plunger 7122 to move. Through the spherical surface, the force provided by the power output component is always kept on the central axis of the plunger 7122.

[0082] When the power output component moves in the opposite direction, it drives the positioning component 71242 and the driving assembly fixed thereto to move. The second driving component 71245 abuts against the flange of the plunger base component 71223 and pulls the plunger 7122 in the opposite direction.

[0083] The inner cavity of the positioning component 71242 is filled with air. When the plunger 7122 moves, the air in the inner cavity can be introduced or exhausted through the airflow channel, thereby maintaining air pressure balance.

[0084] The flow guiding component 7126 is used to guide fresh water to the outer peripheral surface of the plunger 7122, thereby using fresh water to lubricate and cool the plunger 7122.

[0085] Figure 6 This is a perspective view of the flow guiding component in this embodiment.

[0086] like Figure 6 As shown, the flow guiding component 7126 is generally annular, with an annular groove on its outer circumference and an inner circumference, namely an outer annular groove 71261 and an inner annular groove 71262. The cross-section of each groove along the circumference of the flow guiding component 7126 is a flattened rectangle. The flow guiding component 7126 also has multiple radially extending and penetrating flow guiding holes 71263, that is, the flow guiding holes 71263 connect the outer annular groove 71261 and the inner annular groove 71262. The cross-section of the flow guiding holes is circular, and the multiple flow guiding holes 71263 are evenly distributed along the flow guiding component 7126. In this embodiment, there are six flow guiding holes 71263.

[0087] like Figure 3 As shown, the flow guiding component 7126 is fitted onto the plunger cylinder 71221, with its inner circumferential edge roughly in contact with the surface of the plunger cylinder 71221. An inner circumferential groove 71262 forms a flow channel with the plunger cylinder 71221, and the outer circumferential groove 71261 communicates with the inlet freshwater flow channel 71215 and the outlet airflow channel 71216, respectively. The flow guiding component 7126 contacts and is sealed by the high-pressure sealing assembly 71251 and the low-pressure sealing assembly 71252 on both axial sides, respectively. Furthermore, as the plunger 7122 reciprocates, different positions on the outer circumferential surface of the plunger cylinder 71221 are located at the flow guiding component 7126. Therefore, fresh water enters through the fresh water inlet 71215a, passes sequentially through the fresh water inlet channel 71215, the outer circumferential groove 71261, and the guide hole 71263 into the inner circumferential groove 71262, and contacts the outer circumferential surface of the plunger cylinder 71221, thereby lubricating and cooling the plunger cylinder 71221. Then, the fresh water passes sequentially through the guide hole 71263, the outer circumferential groove 71261, and the drain gas flow channel 71216, and is discharged from the drain gas flow channel 71216. The drain gas flow channel 71216 opens vertically upwards, so that even if air bubbles are present in the fresh water, the air in the bubbles can be discharged through the drain gas flow channel 71216.

[0088] Figure 7 This is a cross-sectional view of the power end in this embodiment.

[0089] like Figure 7 As shown, the power end 713 mainly includes a power end valve box 7131 and multiple crankshaft connecting rod mechanisms disposed inside the valve box. The crankshaft connecting rod mechanism includes a crankshaft 7132, a connecting rod 7133 (power output component), a crosshead, and other components. One end of the connecting rod 7133 is installed in the threaded connection hole 71241a of the connecting component 71241 and is threadedly connected to the connecting component 71241. The rotation of the crankshaft 7132 drives the connecting rod 7133 to reciprocate along its axial direction, thereby driving the plunger 7122 to reciprocate through the floating connection assembly 7124.

[0090] The structure of the power end 713 is existing technology, so it will not be described in detail.

[0091] The pump drive mechanism 714 includes a servo motor 7141 and a gearbox 7142.

[0092] The gearbox 7142 is located on one side of the power end 713. The gearbox 7142 has an output shaft on each side and an input shaft on the top. One of the output shafts can be used selectively, so the gearbox 7142 can also be located on the other side of the power end if needed.

[0093] The servo motor 7141 is vertically mounted above the gearbox 7142, with its output shaft facing downwards and connected to the input shaft at the top of the gearbox 7142. This arrangement results in a smaller overall lateral dimension of the first-stage high-pressure pump 71, making it a vertical high-pressure pump that can adapt to the space requirements of containers.

[0094] During operation, the servo motor 7141 drives the crankshaft 7133 to rotate through the gearbox 7142, which in turn drives the connecting rod 7132 to reciprocate in the horizontal direction. The connecting rod 7132 further drives the plunger 7122 to reciprocate.

[0095] When the plunger 7122 moves backward (towards the power end 713), the seawater pressure in the pressurized flow channel 71213 decreases. The valve core 71233 of the outlet valve 7123B remains pressed against the valve seat 71232, while the valve core 71233 of the inlet valve 7123A moves away from the valve seat under the pressure difference, thereby realizing the extraction of seawater from the low-pressure inlet 71211a.

[0096] Then, when the plunger 7122 moves forward (towards the pressurized flow channel 71213), the seawater pressure in the pressurized flow channel 71213 increases, causing the valve core 71233 of the inlet valve 7123A to press against the valve seat 71232, forming a high-pressure area in the pressurized flow channel 71213. When the seawater pressure reaches the predetermined operating pressure, the valve core 71233 of the outlet valve 7123B moves away from the valve seat under the action of the pressure difference, thereby pumping high-pressure seawater of the specified pressure to the high-pressure outlet 71211b.

[0097] In addition, an overflow safety valve (not shown in the figure) connected to the water outlet channel 71212 is provided. When the water pressure in the water outlet channel 71212 exceeds the predetermined safety pressure, the overflow safety valve can release part of the flow to the outside, thereby enabling the first-stage high-pressure pump 71 to operate safely and stably.

[0098] Figure 8 This is a three-dimensional representation of the maintenance status of the primary high-pressure pump in this embodiment. Figure 1 .

[0099] like Figure 1 and Figure 8As shown, multiple inlet valve access openings 71213b are located on the front face of the hydraulic valve box 7121. Each inlet valve access opening 71213b is sealed by a cover sealing assembly 7121D and a rectangular plate-shaped cover 7121C is installed by multiple fasteners (bolts). After removing the cover 7121C and the cover sealing assembly 7121D, the inlet valve access opening 71213b can be exposed. The diameter of the inlet valve access opening 71213b and the inlet valve access opening 71213b at one end is compatible with the inlet valve 7123A. Therefore, each inlet valve 7123A can be easily removed through the inlet valve access opening 71213b for inspection and replacement. The outlet valve 7123B is handled similarly.

[0100] Figure 9 This is a three-dimensional representation of the maintenance status of the primary high-pressure pump in this embodiment. Figure 2 .

[0101] like Figure 1 and Figure 9 As shown, after removing the multiple long bolts used to secure the main body component 7121A, the entire main body component 7121A (including the one-way valve, etc.) can be disassembled to expose the plunger 7122. Then, by rotating the plunger retainer 71222 to remove it, the plunger cylinder 71221 can be removed for inspection or replacement.

[0102] In addition, such as Figures 1 to 3 As shown, the first-stage high-pressure pump 71 also includes an accumulator 7151, an electronic pressure gauge 7152, and a mechanical pressure gauge 7153 (pressure gauge).

[0103] The cover 7121C and the corresponding cover sealing assembly 7121D installed at the water outlet valve inspection opening 71213a also have a through hole communicating with the water outlet channel 71212, which can be used to install the above-mentioned accumulator and pressure gauge.

[0104] The accumulator 7151 has a tubular lower part, mounted on a cover 7121C, and a spherical upper part. Inside the accumulator 7151, a storage chamber is formed that communicates with the water outlet channel 71212. The storage chamber is filled with gas, preferably an inert gas, such as nitrogen. During use, some seawater enters the storage chamber under pressure, with the liquid level approximately in the middle of the chamber. The top of the storage chamber contains compressed gas.

[0105] The accumulator 7151 serves to stabilize the output water pressure. When the water pressure in the outlet channel 71212 fluctuates, for example, when the water pressure increases, more seawater will enter the storage chamber, further compressing the gas inside the chamber. Consequently, the amount of water in the outlet channel 71212 decreases slightly, thus slightly reducing the output water pressure. Conversely, when the output water pressure decreases, under the pressure of the compressed gas inside the storage chamber, some seawater will be discharged from the storage chamber. Consequently, the amount of water in the outlet channel 71212 increases slightly, thus slightly increasing the output water pressure and stabilizing the output water pressure.

[0106] Electronic pressure gauge 7152 and mechanical pressure gauge 7153 are used to detect the pressure of seawater in the water flow channel 71212, that is, the pressure of seawater output by the first-stage high-pressure pump 71. Among them, electronic pressure gauge 7152 can provide more accurate pressure values, and mechanical pressure gauge 7153 can still provide pressure values ​​even if electronic pressure gauge 7152 fails. Since the water pressure output by the first-stage high-pressure pump 71 directly affects the reverse osmosis effect, monitoring its output water pressure is essential; therefore, this redundancy design is highly advantageous.

[0107] In this embodiment, the plunger cylinder 71221 of the plunger 7122 is made of a ceramic or metal material resistant to seawater corrosion, preferably ceramic. The plunger fixing member 71222 and the plunger base member 71223 are made of a metal material resistant to seawater corrosion, preferably stainless steel, such as 17-4PH stainless steel. The valve core 71233 of the one-way valve 7123 is made of a metal material resistant to seawater corrosion and with high strength and wear resistance, such as titanium alloy, such as TC4 titanium alloy. The valve cover 71231 is made of engineering plastic or stainless steel, and the cover seat 71232 is made of stainless steel, such as 2507 stainless steel. In the hydraulic end valve box 7121, the main body component 7121A and other seawater flow components are made of 2507 stainless steel, the cover 7121C and its fixing components and other auxiliary non-seawater flow components can be made of 316L stainless steel, the power transmission components of the plunger (connecting component 71241, positioning component 71242, etc.) can be made of 2Cr13 stainless steel, and the first driving component 71244 and the second driving component 71245 are made of a material with a certain elasticity, such as polyurethane (PU).

[0108] In this embodiment, a booster pump is installed before the primary high-pressure pump 71. The pressure of the low-pressure seawater input to the hydraulic end 712 is 0.1 MPa to 0.5 MPa, and the pressure of the high-pressure seawater output from the hydraulic end 712 is 5 MPa to 7 MPa, with a required flow rate of 83 L / min. Correspondingly, the diameter of the plunger 7122 is 20 mm to 40 mm, the number of plungers 7122 is 3 to 7, the speed of the servo motor 7141 is 1500 r / min, and the reduction ratio of the gearbox 7142 is 3 to 5, that is, the output speed of the gearbox 7142 is 300 r / min to 500 r / min. In this embodiment, the reduction ratio is 4.45. In addition, since the output water pressure of the primary high-pressure pump 71 is lower than 16 MPa, the wall thickness of the hydraulic end valve box 7121 can be maintained at 3 mm to 10 mm, preferably 5 mm to 10 mm, and more preferably 5 mm to 8 mm. The overall volume of the hydraulic end valve box 7121 is between 15L and 30L.

[0109] Functions and effects of Example 1

[0110] According to the primary high-pressure pump, reverse osmosis mechanism, and seawater salt production system provided in this embodiment, the primary high-pressure pump uses a plunger to pressurize the seawater, that is, the pump is a positive displacement pump, and a servo motor is used to drive the plunger. Positive displacement pumps have advantages such as large and stable flow rate, high energy efficiency, compact structure, and easy precise control. Compared with asynchronous motors, servo motors are smaller in size and can achieve high-precision control. Therefore, the primary high-pressure pump is significantly smaller in size while maintaining the ideal flow rate, and can achieve a fast and accurate response when the system operating conditions change, thereby making the concentrated seawater output by the reverse osmosis module stable and conducive to the stable and efficient production of edible salt.

[0111] Furthermore, the plunger is also equipped with a flow guiding component, which guides fresh water to the outer circumference of the plunger through its flow channel. This allows the fresh water to lubricate and cool the plunger, avoiding the problem of microcrystals and wear on components such as the plunger that occurs when using seawater. This further extends the service life of components such as the plunger and reduces the frequency of maintenance by workers. Moreover, since this first-stage high-pressure pump is used in a seawater-to-salt production system, a large amount of fresh water will also be produced after reverse osmosis treatment. Therefore, fresh water can be easily introduced into the first-stage high-pressure pump without the need for additional fresh water treatment equipment in the system. This is an ingenious design that rationally and effectively utilizes system resources.

[0112] In this embodiment, the flow guiding component has an outer circumferential groove, an inner circumferential groove, and multiple flow guiding holes. The multiple flow guiding holes disperse fresh water into the inner circumferential groove, allowing it to contact the outer circumferential surface of the plunger cylinder, thus providing more uniform lubrication and cooling to the plunger cylinder. A fresh water inlet channel, which cooperates with the flow guiding component, supplies fresh water horizontally from one side, while a venting channel extends vertically upwards to the top of the valve box. This allows air to be automatically discharged through the venting channel, preventing air accumulation inside the valve box and thus avoiding interference with the normal operation of the plunger.

[0113] Furthermore, the plunger's cross-sectional area (diameter) is designed to be relatively large. This reduces the frequency of the plunger's reciprocating motion while maintaining flow rate, thereby reducing the output speed of the motor and reducer. This effectively reduces noise and vibration, resulting in energy savings. Since the seawater-to-salt system needs to operate for extended periods, even 24 / 7, the energy savings will be substantial. Moreover, the wall thickness of the hydraulic valve box does not need to increase with the plunger's cross-sectional area, which also facilitates the miniaturization of the first-stage high-pressure pump and reduces equipment costs.

[0114] It should be noted that in this invention, the plunger diameter is increased to reduce output speed, noise, and component wear. However, increasing the plunger diameter leads to an increase in crankshaft reaction force at the same output pressure. Therefore, according to existing industry standards, to ensure the reliability of the high-pressure pump, the wall thickness of the hydraulic valve box or the frame size also needs to be increased accordingly when the plunger diameter is increased, resulting in an increase in the size of the high-pressure pump. In this invention, since the system needs to be integrated within the space of a shipping container, the space for individual devices is very limited, and the high-pressure pump needs to be minimized; further increases in size are unacceptable. Conversely, according to existing industry standards, if the plunger diameter is reduced, the size of the high-pressure pump can be reduced accordingly. However, to maintain the flow rate, the frequency of the plunger's reciprocating motion needs to be increased, which increases the linear velocity of the plunger's horizontal movement. This leads to significantly increased wear on the plunger sealing components, making it impossible for the high-pressure pump to operate continuously for extended periods. It also increases the vibration of the high-pressure pump, which is also unacceptable in the application scenario of this invention. In this invention, since the water pressure that the first-stage high-pressure pump needs to withstand is less than 16MPa, after repeated research and testing, it was confirmed that the plunger diameter can be increased to the above range to reduce the output speed of the pump drive mechanism. At the same time, the wall thickness of the hydraulic end valve box can be reduced without increasing it. Therefore, the high-pressure pump can be miniaturized, while reducing noise and extending the long-term continuous working time of the high-pressure pump.

[0115] Furthermore, the plunger and crankshaft connecting rod are connected by a floating connection assembly. When the connecting rod moves forward, the spherical surface pushes against the outer end face of the plunger base. Due to dimensional tolerances in the components, it is difficult to ensure that the crankshaft connecting rod and plunger are always coaxial. Using a conventional fixed connection method, the dimensional tolerances will cause a certain degree of eccentricity, reducing the concentricity of the plunger and plunger sealing assembly, which in turn leads to wear of the plunger and plunger sealing assembly and reduces the continuous service life of the first-stage high-pressure pump. In the embodiment, however, by using the spherical surface to push the plunger, it can be ensured that the force of the crankshaft connecting rod always acts on the central axis of the plunger, further reducing the eccentricity and improving the service life of the plunger and plunger sealing assembly.

[0116] Furthermore, the plunger cylinder is made of ceramic material, and the valve core of the one-way valve is made of titanium alloy. This not only prevents these components from being corroded by seawater, but also reduces the wear of these high-frequency moving parts, thereby reducing the frequency of maintenance. In the hydraulic end, the seawater flow parts are made of 2507 stainless steel, and the auxiliary non-flow parts are made of 316L stainless steel, which enables the system to operate stably for a longer period of time and keeps the overall cost of the first-stage high-pressure pump low.

[0117] Furthermore, each of the inlet and outlet valves has a corresponding inspection opening on one side. Removing the corresponding cover and sealing assembly exposes the inspection opening, allowing for convenient inspection or replacement of the inlet and outlet valves. Additionally, the main tank assembly can be completely disassembled, exposing at least the tip of the plunger, facilitating easy inspection or replacement of the plunger cylinder. These designs enable convenient inspection and replacement of relatively wear-prone components such as check valves and plunger cylinders, reducing the frequency of the high-pressure pump being returned to the factory for complete overhaul.

[0118] Furthermore, an accumulator connected to the outlet flow channel is installed on the hydraulic end, which is filled with inert gas. It can use compressed gas to achieve adaptive adjustment of the outlet pressure, making the outlet pressure more stable. This helps to maintain the quality of the concentrated seawater produced. Moreover, the outlet pressure can be adjusted through a simple principle and structure, without the need for complex electrical control design.

[0119] Furthermore, an electronic pressure gauge and a mechanical pressure gauge are installed on the hydraulic end, connected to its outlet flow channel. The electronic pressure gauge provides a more accurate outlet pressure value, while the mechanical pressure gauge provides a more accurate outlet pressure value in case of electronic pressure gauge failure. This redundant design avoids situations where the outlet pressure cannot be obtained due to malfunction, maintaining real-time monitoring of the outlet pressure and thus ensuring the effectiveness of reverse osmosis filtration.

[0120] In this embodiment, the servo motor is vertically mounted above the gearbox, making the first-stage high-pressure pump a vertical high-pressure pump with a relatively high vertical height and a small horizontal dimension, which can adapt to the space requirements in the container.

[0121] <Example 2>

[0122] This embodiment provides a high-pressure pump, a reverse osmosis mechanism, and a seawater salt production system. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0123] Figure 10 This is a three-dimensional view of the first-stage high-pressure pump in this embodiment.

[0124] like Figure 10 As shown, the difference between this embodiment and Embodiment 1 is that the structure of the pump drive mechanism in the first-stage high-pressure pump 71' is different from that in Embodiment 1.

[0125] In this embodiment, the pump drive mechanism 714' also includes a servo motor 7141 and a gearbox 7142', but the input shaft and output shaft of the gearbox 7142' are located on both sides of the gearbox 7142', and the servo motor 7141 is horizontally arranged on one side of the gearbox 7142', with its output shaft facing the gearbox 7142' and connected to the input shaft of the gearbox 7142'.

[0126] That is, the first-stage high-pressure pump 71' in this embodiment is a horizontal high-pressure pump with a relatively larger lateral dimension and a smaller longitudinal height.

[0127] In this embodiment, the other structures are the same as in Embodiment 1, so they will not be described again.

[0128] Functions and effects of Example 2

[0129] Based on the function and effect of the first-stage high-pressure pump, reverse osmosis mechanism and seawater salt production system provided in this embodiment, the overall height of the first-stage high-pressure pump in this embodiment is greatly reduced and the lateral dimension is increased compared with that in embodiment one, due to the use of a coaxial gearbox and a horizontally arranged servo motor. The first-stage high-pressure pump in embodiment one or this embodiment can be selected according to the space requirements in the container.

[0130] <Variation Example>

[0131] This variation provides a single-stage variable pressure pump, a reverse osmosis mechanism, and a seawater salt production system. In this embodiment, the same symbols are assigned to the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0132] Figure 11 This is a three-dimensional view of the primary high-pressure pump in this variation.

[0133] like Figure 11 As shown, compared with Embodiment 1, the difference lies in the structure of the cover in the first-stage high-pressure pump 71' of this embodiment. The cover 7121C' is a long strip plate that can cover multiple inlet valve maintenance openings 71213b on the front end face of the hydraulic valve box 7121. During maintenance, after removing the cover 7121C' and multiple cover sealing assemblies 7121D, the inlet valve maintenance openings 71213b can be exposed for maintenance or replacement of the inlet valve 7123A. Similarly, the cover on the upper surface of the hydraulic valve box 7121 can also adopt a similar design, that is, a long strip cover can be used to cover multiple outlet valve maintenance openings 71213a at the same time.

[0134] <Comparative Example>

[0135] This comparative example provides a prior art high-pressure liquid pump for comparison with the performance of the first-stage high-pressure pump 71 provided in the embodiment.

[0136] Existing high-pressure liquid pumps are also plunger pumps, with plunger diameters ranging from 20mm to 40mm. However, according to relevant industry standards, the wall thickness of their hydraulic end valve box must be at least 15mm. These existing high-pressure liquid pumps use a three-phase asynchronous motor to drive the plunger. To achieve the same flow rate, the three-phase asynchronous motor needs to operate at a speed of 1500 r / min, consuming at least 15 kW of electrical energy during continuous operation for one hour.

[0137] In comparison, the wall thickness of the primary high-pressure pump 71 in this embodiment is only 3mm to 10mm, significantly reducing its overall size. The servo motor 7141 of the primary high-pressure pump 71 in this embodiment operates at a speed of 1500 r / min. Since the output power of the servo motor can vary with the system load, and the energy consumed during continuous operation at the same flow rate for one hour is only 11.5KW, a reduction of approximately 1 / 4, this can save a significant amount of energy for long-term seawater salt production systems while achieving the same flow rate and pressurized seawater, and also provides better control precision. Furthermore, the speed output of the reduction gearbox 7142 of the primary high-pressure pump 71 in this embodiment is only 300 r / min to 500 r / min, thus greatly reducing noise and vibration.

[0138] The above embodiments and modifications are merely illustrative of specific implementations of the present invention, and the present invention is not limited to the scope of the above embodiments. Those skilled in the art should understand that the present invention is not limited to the above embodiments and modifications. The embodiments, modifications, and descriptions in the specification are only for illustrating the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single-stage high-pressure pump, installed in at least the first-stage reverse osmosis module of a seawater-to-salt production system, for pressurizing seawater, characterized in that... include: The hydraulic end is used to pressurize the seawater; The power end is used to provide power to the hydraulic end; as well as The pump drive mechanism includes a servo motor for driving the power end. The hydraulic end includes: The hydraulic valve box has independent seawater and freshwater channels; A plunger, reciprocatingly disposed in the hydraulic end valve box, is used to pressurize the seawater in the seawater channel; and A flow guiding component, sleeved on the plunger, has a flow guiding channel communicating with the fresh water channel, for guiding fresh water from the fresh water channel to the outer circumferential surface of the plunger, thereby lubricating and cooling the plunger.

2. The primary high-pressure pump according to claim 1, Its features are: The freshwater channel includes: A freshwater inlet channel extends to one side of the hydraulic valve box and communicates with the outside, used to guide freshwater into the guide channel; and A drainage and airflow channel extends to the top of the hydraulic end valve box and communicates with the outside, for discharging the fresh water and air. The flow guiding component is annular, with annular grooves on its outer and inner circumferences, and multiple flow guiding holes inside connecting the outer annular groove and the inner annular groove. The outer circumferential annular groove is connected to the freshwater inlet channel and the exhaust gas channel, respectively. An annular cavity is formed between the inner circumferential groove and the outer circumferential surface of the plunger.

3. The primary high-pressure pump according to claim 1, characterized in that: in, The primary high-pressure pump is used to pressurize the seawater to 5 MPa to 7 MPa. The plunger is cylindrical with a diameter of 20mm to 40mm. The wall thickness of the hydraulic end valve box is 3mm to 10mm. The pump drive mechanism also includes a reduction gearbox, through which the servo motor drives the power unit. The servo motor has a rotational speed of 1500 r / min. The reduction ratio of the gearbox is 3 to 5.

4. The primary high-pressure pump according to claim 1, Its features are: The power end has a power output component for driving the plunger to reciprocate. One end of the plunger has a flange. The hydraulic end also includes a floating connection assembly, which comprises: A connecting component, one end of which is fixed to one end of the power output component, and the other end has a receiving groove. The bottom surface of the receiving groove has a spherical surface in the middle, which is used to abut against the plunger and push the plunger when the power output component moves toward the plunger. A positioning component is fitted onto the end of the plunger having the flange and onto the connecting component; and A drive component, disposed at the opening of the receiving groove, is used to drive the plunger to move when the power output component moves in a direction away from the plunger. The hydraulic end has a cavity for accommodating the floating connection assembly and a gas channel communicating with the cavity.

5. The primary high-pressure pump according to claim 1, characterized in that: in, The hydraulic end valve box includes a main body component and multiple cover components. The main body of the tank has a low-pressure water inlet on one side and a high-pressure water outlet on at least one side. The main body of the tank has an inlet channel communicating with the low-pressure water inlet, an outlet channel communicating with the high-pressure water outlet, and multiple pressurizing channels connecting the inlet channel and the outlet channel. There are multiple plungers, each corresponding to one of the multiple pressurized flow channels. The hydraulic end also includes multiple check valves. The one-way valve includes an inlet valve and an outlet valve, which are respectively located at both ends of each of the pressurized flow channels. One end of the pressurized flow channel forms an inlet valve maintenance opening on the side of the main body component of the tank, and the other end of the pressurized flow channel forms an outlet valve maintenance opening on the top surface of the main body component of the tank. Multiple covers are detachably installed at the inlet valve maintenance opening and the outlet valve maintenance opening, respectively.

6. The primary high-pressure pump according to claim 5, characterized in that: in, The plunger includes a plunger cylinder made of a ceramic or metal material resistant to seawater corrosion. The hydraulic end valve box is made of a metal material resistant to seawater corrosion. The valve core of the one-way valve is made of a metal material that is resistant to seawater corrosion and wear. The hydraulic valve box also has multiple mounting holes for detection components that communicate with the water outlet channel, for mounting accumulators, electronic pressure gauges, and mechanical pressure gauges, respectively. The accumulator is used to stabilize the outlet water pressure and has an inner cavity that communicates with the outlet water channel and is filled with inert gas.

7. The primary high-pressure pump according to claim 1, characterized in that: in, The pump drive mechanism also includes a reduction gearbox, through which the servo motor drives the power unit. The gearbox has an output terminal on at least one side and an input terminal on the top. The output terminal is connected to the power terminal. The servo motor is vertically mounted above the gearbox, and the output end of the servo motor is connected to the input end of the gearbox.

8. The primary high-pressure pump according to claim 1, characterized in that: in, The pump drive mechanism also includes a reduction gearbox, through which the servo motor drives the power unit. The gearbox has an input terminal and an output terminal on each side. The output terminal is connected to the power terminal. The servo motor is horizontally mounted on one side of the gearbox, and the output end of the servo motor is connected to the input end of the gearbox.

9. A reverse osmosis mechanism, installed in a seawater-to-salt production system, characterized in that, include: One or more reverse osmosis modules, The reverse osmosis module, at least in the first stage, includes: A first-stage high-pressure pump is used to pressurize seawater to 5MPa–7MPa; and The reverse osmosis section is used to treat the pressurized seawater using reverse osmosis, thereby separating concentrated brine from the seawater. The primary high-pressure pump is the primary high-pressure pump according to any one of claims 1-8.

10. A system for producing edible salt from seawater, characterized in that, include: A reverse osmosis unit is used to treat seawater by reverse osmosis, thereby separating concentrated brine from the seawater. The reverse osmosis mechanism is the reverse osmosis mechanism as described in claim 9.

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