First-stage high-pressure pump, reverse osmosis unit, and seawater-to-salt system

Abstract

This invention provides a primary high-pressure pump, a reverse osmosis mechanism, and a seawater salt production system. The primary high-pressure pump uses a plunger to pressurize the seawater, making it a positive displacement pump. A servo motor drives the plunger. Positive displacement pumps offer advantages such as large and stable flow rate, high energy efficiency, compact structure, and easy precise control. Compared to asynchronous motors, servo motors are smaller and can achieve high-precision control. Therefore, this primary high-pressure pump is significantly smaller while maintaining an ideal flow rate and can respond quickly and accurately to changes in system operating conditions. This ensures stable concentrated seawater quality output from the reverse osmosis module, facilitating the stable and efficient production of edible salt.

Description

Technical Field

[0001] This utility model 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 production system. Background Technology

[0002] Traditional methods for producing sea salt mainly include boiling, sun-drying, and spray evaporation. Each of these methods has its drawbacks. For example, boiling is only suitable for industrial salt production and is energy-intensive; sun-drying requires a large area and manpower, and has a long production cycle; spray evaporation also requires a large area and is energy-intensive. Therefore, to produce edible salt from seawater more efficiently and energy-savingly, and to fully utilize sea salt resources, a new type of seawater-to-edible-salt system is needed.

[0003] Currently, there is a membrane-based freshwater production system that can be used to collect, filter, and reverse osmosis seawater to obtain freshwater and concentrated wastewater. To prevent equipment clogging, the system undergoes chemical flushing, therefore the concentrated wastewater cannot be used to produce edible-grade salt. The inventors have improved upon the aforementioned seawater-to-freshwater system to create a seawater-to-edible-salt system. Considering the convenience of transportation and deployment in practical use, the system is integrated into a single container. This new system requires a high-pressure pump that works at least with the first-stage reverse osmosis membrane. While various high-pressure liquid pumps exist on the market, they are generally unsuitable for this new system due to the following two main problems:

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

[0005] On the other hand, the system needs to operate for a long time or even around the clock. Therefore, the first-stage high-pressure pump needs to pressurize seawater for a long time. Seawater flows inside the pump body for a long time, which will cause corrosion to the components of the high-pressure pump. Under the influence of pressure and other factors, the salt and other components in the seawater will form micro-crystals that precipitate out, causing wear on the components, affecting the stability of the high-pressure pump operation and its service life. This leads to the need for frequent manual intervention and replacement of components, which is inconvenient to use and also causes high operating costs. Utility Model Content

[0006] This utility model is 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, has a large flow rate, and is relatively smaller, a reverse osmosis mechanism using the high-pressure pump, and a seawater salt production system including the reverse osmosis mechanism. The present utility model adopts the following technical solution:

[0007] This utility model provides a primary high-pressure pump, installed in the reverse osmosis module of a seawater-to-salt production system, for pressurizing seawater. The primary high-pressure pump comprises: a hydraulic end for pressurizing the seawater; a power end for providing power to the hydraulic end; a reduction gearbox connected to the power end; and a servo motor connected to the reduction gearbox. The hydraulic end includes: a hydraulic end valve box with a seawater channel for flowing seawater; and a plunger reciprocatingly disposed in the hydraulic end valve box for pressurizing the seawater in the seawater channel.

[0008] The primary high-pressure pump provided by this utility model may also have the following technical features: the plunger includes a plunger cylinder made of a seawater-resistant ceramic or metal material, preferably a ceramic material; the hydraulic end valve box is made of a seawater-resistant metal material, preferably stainless steel; a one-way valve is provided in the seawater channel, at least the valve core of the one-way valve is made of titanium alloy; the plunger is cylindrical with a diameter of 20mm~40mm; the wall thickness of the hydraulic end valve box is 3mm~10mm; the pump drive mechanism also includes a reduction gearbox; the servo motor drives the power end through the reduction gearbox; the servo motor has a speed of 1500 r / min; and the reduction ratio of the reduction gearbox is 3~5.

[0009] The first-stage high-pressure pump provided by this utility model may also have the following technical features: the hydraulic end valve box further has a freshwater channel for flowing freshwater, the seawater channel and the freshwater channel are independent of each other, the freshwater channel includes: a freshwater inlet channel extending to one side of the hydraulic end valve box and communicating with the outside; 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 hydraulic end also includes an annular guide component, fitted on the plunger, for guiding freshwater to the outer circumferential surface of the plunger. The outer and inner circumferences of the guide component each have annular grooves, and the interior has multiple guide holes communicating with the outer annular groove and the inner annular groove. The outer annular groove communicates with the freshwater inlet channel and the drainage airflow channel respectively, and the inner annular groove forms an annular cavity with the outer circumferential surface of the plunger.

[0010] The primary high-pressure pump provided by this utility model may also have the following technical features: the power end has a power output component that moves along the reciprocating motion direction; the hydraulic end further includes a floating connection assembly, which includes: a connecting component, one end of which is fixed to 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, for abutting against one end of the plunger when the power output component moves toward the plunger, thereby keeping the thrust output by the power output component acting on the central axis of the plunger; a positioning component, sleeved on the flanged end of the plunger and the connecting component; and a driving component, disposed at the opening of the receiving groove, driving the plunger to move when the power output component moves away from the plunger.

[0011] The high-pressure pump provided by this utility model may also have the following technical features: an input end and an output end are respectively provided on both sides of the reduction gearbox, 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.

[0012] The high-pressure pump provided by this utility model may also have the following technical features: at least one side of the reduction gearbox is provided with an output end and the top is provided with an input end; the output end is connected to the power end; the servo motor is vertically arranged above the reduction gearbox; and the output end of the servo motor is connected to the input end of the reduction gearbox.

[0013] The first-stage high-pressure pump provided by this utility model may also have the following technical features: the seawater channel includes a low-pressure inlet located at the lower part of one side of the hydraulic end valve box, an inlet channel communicating with the low-pressure inlet, a high-pressure outlet located at the upper part of one or both sides of the hydraulic end valve box, an outlet channel communicating with the high-pressure outlet, and a pressurizing channel connecting the inlet channel and the outlet channel. The plunger is correspondingly arranged with the pressurizing channel. The hydraulic end valve box also has multiple mounting holes for detection components communicating with the outlet channel, which are used to install an accumulator, an electronic pressure gauge, and a mechanical pressure gauge, respectively. The accumulator is used to stabilize the outlet pressure and has an inner cavity communicating with the outlet channel, which is filled with gas.

[0014] The first-stage high-pressure pump provided by this utility model may also have the following technical features: the hydraulic end valve box includes a main body component and multiple covers; there are multiple plungers and multiple corresponding pressurization channels; each pressurization channel is provided with an inlet valve and an outlet valve at both ends, both of which are one-way valves, used to cooperate with the corresponding plunger to pressurize the seawater; one end of the pressurization channel forms an inlet valve inspection opening on the side of the main body component, and the other end of the pressurization channel forms an outlet valve inspection opening on the top surface of the main body component; the multiple covers are detachably installed at the inlet valve inspection opening and the outlet valve inspection opening, and a sealing element is provided between the cover and the corresponding one-way valve.

[0015] 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; and a reverse osmosis membrane for treating the pressurized seawater using reverse osmosis, thereby separating concentrated seawater from the seawater. The high-pressure pump is the aforementioned high-pressure pump.

[0016] This utility model provides a seawater-to-edible-salt system, which includes a reverse osmosis mechanism for treating seawater via reverse osmosis to separate concentrated seawater. The reverse osmosis mechanism is the one described above.

[0017] Functions and effects of utility models

[0018] According to the first-stage high-pressure pump, reverse osmosis mechanism, and seawater salt production system provided by this utility model, the first-stage 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 first-stage 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. Attached Figure Description

[0019] Figure 1 This is a perspective view of the first-stage high-pressure pump in Embodiment 1 of this utility model;

[0020] Figure 2 This is a cross-sectional view of the hydraulic end in Embodiment 1 of this utility model;

[0021] Figure 3This is a perspective view of the main body of the box in Embodiment 1 of this utility model;

[0022] Figure 4 This is a cross-sectional schematic diagram of the one-way valve in Embodiment 1 of this utility model;

[0023] Figure 5 yes Figure 2 Enlarged view of the inner part of frame A;

[0024] Figure 6 This is a perspective view of the flow guiding component in Embodiment 1 of this utility model;

[0025] Figure 7 This is a cross-sectional view of the power end in Embodiment 1 of this utility model;

[0026] Figure 8 This is a three-dimensional representation of the maintenance status of the primary high-pressure pump in Embodiment 1 of this utility model. Figure 1 ;

[0027] Figure 9 This is a three-dimensional representation of the maintenance status of the primary high-pressure pump in Embodiment 1 of this utility model. Figure 2 ;

[0028] Figure 10 This is a perspective view of the primary high-pressure pump in Embodiment 2 of this utility model.

[0029] Figure label:

[0030] 71 high-pressure pump; 711 fixed base; 7111 support foot; 712 hydraulic end; 7121 hydraulic end valve box; 7121A main body component; 7121B connecting component; 7121C cover; 7121D cover sealing assembly; 71211 water inlet channel; 71211a low-pressure water inlet; 71212 water outlet channel; 71212a high-pressure water outlet; 71213 pressurizing channel; water outlet valve maintenance opening. 71213a; Inlet valve inspection opening 71213b; Plunger moving chamber 71214; Fresh water inlet channel 71215; Fresh water inlet 71215a; Drain air channel 71216; Drain air outlet 71216a; Plunger 7122; Plunger cylinder 71221; Plunger fixing part 71222; Plunger base part 71223; Flange 71223a; Check valve 7123; Inlet valve 7123A; Outlet valve 71 23B; 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

[0031] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following describes in detail the first-stage high-pressure pump, reverse osmosis mechanism and seawater salt production system of this utility model with reference to the embodiments and accompanying drawings.

[0032] <Example 1>

[0033] This embodiment provides a single-stage 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.

[0034] 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.

[0035] 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 pressurizes the seawater entering the reverse osmosis membrane, thereby utilizing the membrane structure and the pressure difference across the membrane 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.

[0036] The structure of the first-stage high-pressure pump will be described in detail below.

[0037] Figure 1 This is a three-dimensional view of the first-stage high-pressure pump in this embodiment.

[0038] 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.

[0039] 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.

[0040] Figure 2 This is a three-dimensional view of the hydraulic end in this embodiment. Figure 3 This is a cross-sectional view of the hydraulic end in this embodiment.

[0041] like Figure 2 and Figure 3 As shown, 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). 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.

[0042] Figure 4 This is a perspective view of the hydraulic end valve box in this embodiment.

[0043] like Figure 3 and Figure 4 As shown, the hydraulic end valve box 7121 includes a box body component 7121A, a box connecting component 7121B, multiple cover components 7121C, and multiple cover sealing assemblies 7121D.

[0044] The main body component 7121A is generally rectangular in shape. The connecting component 7121B is generally trapezoidal in shape, with its width and height being smaller than those of the main body component 7121A, respectively. The connecting component 7121B is located between the main body component 7121A and the front end of the power end 713, and the three are fixedly connected by multiple long screws. Multiple cover pieces 7121C and multiple cover sealing assemblies 7121D are respectively provided at multiple openings on the main body component 7121A for sealing and blocking the openings.

[0045] The hydraulic end valve box 7121 has independent seawater and freshwater channels inside, as well as multiple plunger movement chambers.

[0046] The seawater channel includes an inlet channel 71211, an outlet channel 71212, and multiple pressurized channels 71213.

[0047] The inlet channel 71211 extends and runs through the hydraulic end valve box 7121 along its length and is located at the lower part of the hydraulic end valve box 7121. Its cross-section is circular, and its two ends are two low-pressure inlets 71211a located at the lower part of both sides of the hydraulic end valve box 7121.

[0048] The outlet channel 71212 extends and runs through the main body component 7121A, and is located on the upper part of the hydraulic end valve box 7121. Its cross-section is circular, with two high-pressure outlets 71212a located on the upper sides of the hydraulic end valve box 7121 at its two ends. The diameter of the high-pressure outlets 71212a is smaller than the diameter of the low-pressure inlet 71211a. The high-pressure outlets 71212a can be connected to the inlet of the reverse osmosis membrane of this stage via appropriate pipelines.

[0049] Multiple pressurizing channels 71213 are used to pressurize seawater in conjunction with corresponding plungers and check valves. Each pressurizing channel 71213 is roughly "T" shaped, with its upper end connected to the outlet channel 71212, one lower end connected to the inlet channel 71211, and the upper end connected to the outside. A circular outlet valve maintenance opening 71213a is formed on the upper surface of the hydraulic valve box 7121, and the other lower end is also connected to the outside. A circular inlet valve maintenance opening 71213b is formed on the front end face of the hydraulic valve box 7121.

[0050] 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.

[0051] The freshwater channel is used in conjunction with the flow guiding component to achieve freshwater lubrication and cooling of the plunger, and includes multiple freshwater inlet channels 71215 and multiple exhaust channels 71216.

[0052] The freshwater inlet channel 71215 extends along the length of the main tank component 7121A, from one side of the hydraulic valve box 7121 to near the plunger moving chamber 71214, with one end being the freshwater inlet 71215a located on one side of the hydraulic 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The plunger cylinder 71221 is a hollow cylindrical shape with an axially penetrating mounting hole in the middle.

[0057] 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 and has a threaded hole in the middle.

[0058] The plunger retainer 71222 is a fixing bolt that passes through the plunger cylinder 71221. One end of its screw is threadedly connected to the plunger base 71223, and its nut is located outside one end of the plunger cylinder 71221 and abuts against the outer end face of that end, thereby fixing the plunger cylinder 71221. The outer end face of the plunger base 71223 is a plane, and this plane is perpendicular to the axial direction of the plunger 7122.

[0059] 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 main body component 7121A. During operation, the three plungers 7122 alternately reciprocate.

[0060] Figure 5 This is a cross-sectional view of the one-way valve in this embodiment.

[0061] like Figure 5 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] like Figure 3 As 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.

[0066] 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.

[0067] 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.

[0068] Figure 6 yes Figure 3 Enlarged view of the inner part of frame A.

[0069] like Figure 3 and Figure 6 As shown, the floating connection assembly 7124 includes a connecting component 71241, a positioning component 71242, a spherical component 71243, and a driving component.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] The positioning component 71242 has an air cavity. When the plunger 7122 moves, the air in the cavity can be discharged to the outside through the airflow channel or drawn in from the outside, thereby maintaining air pressure balance.

[0077] 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.

[0078] Figure 7 This is a perspective view of the flow guiding component in this embodiment.

[0079] like Figure 7 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.

[0080] like Figure 3As 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.

[0081] Figure 8 This is a cross-sectional view of the power end in this embodiment.

[0082] like Figure 8 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.

[0083] The structure of the power end 713 is existing technology, so it will not be described in detail.

[0084] The pump drive mechanism 714 includes a servo motor 7141 and a gearbox 7142.

[0085] 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.

[0086] 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 10, making it a vertical high-pressure pump that can adapt to the space requirements of containers.

[0087] 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.

[0088] 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, thus realizing the extraction of seawater from the low-pressure inlet 71211a.

[0089] 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.

[0090] 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.

[0091] Figure 9 This is a three-dimensional representation of the maintenance status of the primary high-pressure pump in this embodiment. Figure 1 .

[0092] like Figure 1 and Figure 9As 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 this 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.

[0093] Figure 10 This is a three-dimensional representation of the maintenance status of the primary high-pressure pump in this embodiment. Figure 2 .

[0094] like Figure 1 and Figure 10 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.

[0095] 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).

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] In this embodiment, the plunger cylinder 71221 of the plunger 7122 is made of a seawater-resistant ceramic or metal material, preferably a ceramic material. The plunger retainer 71222 and the plunger base 71223 are made of a seawater-resistant metal material, preferably stainless steel, such as 17-4PH stainless steel. The valve core of the one-way valve 7123 is made of a seawater-resistant and high-strength metal material, preferably a titanium alloy, such as TC4 titanium alloy. The valve cover is made of engineering plastic or stainless steel, and the valve seat 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).

[0101] 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.

[0102] Functions and effects of Example 1

[0103] 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.

[0104] 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.

[0105] 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.

[0106] Furthermore, the plunger's cross-sectional area is designed to be relatively large. This reduces the frequency of the plunger's reciprocating motion while maintaining flow rate, thereby lowering the output speed of the motor and reducer. This effectively reduces noise and vibration, resulting in energy savings. Since the seawater salt production 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.

[0107] 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, increasing the diameter also requires a corresponding increase in the wall thickness of the hydraulic valve box or the frame size. For example, for plungers with a diameter of 20mm to 40mm in the embodiment, the wall thickness of the hydraulic valve box is at least 15mm, which will increase 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 miniaturized as much as possible; further increasing the size is 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 motion. This leads to significantly increased wear on the plunger sealing components, making it impossible for the high-pressure pump to operate continuously for a long time, and 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 16 MPa, it has been confirmed through repeated research and experiments 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 the size of the high-pressure pump. This allows the high-pressure pump to be miniaturized, while reducing noise and extending the long-term continuous working time of the high-pressure pump.

[0108] 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.

[0109] 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.

[0110] 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 maintenance and replacement of frequently operating and relatively wear-prone components such as check valves and plunger cylinders, thereby reducing the frequency of the entire first-stage high-pressure pump being returned to the factory for overhaul.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] <Example 2>

[0115] 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.

[0116] Figure 10 This is a three-dimensional view of the first-stage high-pressure pump in this embodiment.

[0117] 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.

[0118] 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'.

[0119] 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.

[0120] In this embodiment, the other structures are the same as in Embodiment 1, so they will not be described again.

[0121] Functions and effects of Example 2

[0122] 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.

[0123] The above embodiments are merely illustrative of specific implementations of this utility model, and the utility model is not limited to the scope of the above embodiments. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only for illustrating the principles of the utility model. Various changes and modifications can be made to the utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A single-stage high-pressure pump, installed in the 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; The gearbox is connected to the power end via a transmission. as well as The servo motor is connected to the gearbox for transmission. The hydraulic end includes: A hydraulic valve box having a seawater passage for the flow of the seawater; and A plunger, which can reciprocate, is installed in the hydraulic end valve box to pressurize the seawater in the seawater channel.

2. The primary high-pressure pump according to claim 1, 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 seawater channel is equipped with a one-way valve, and at least the valve core of the one-way valve is made of titanium alloy. The plunger is cylindrical with a diameter of 20mm to 40mm. The wall thickness of the hydraulic end valve box is 3mm~10mm.

3. The primary high-pressure pump according to claim 1, Its features are: The hydraulic valve box also includes a freshwater channel for freshwater flow, and the seawater channel and the freshwater channel are independent of each other. The freshwater channel includes: A freshwater inlet channel extends to one side of the hydraulic valve box and communicates with the outside; 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 hydraulic end also includes an annular flow guide component, fitted onto the plunger, for guiding fresh water to the outer circumferential surface of the plunger. The flow guiding component has annular grooves on its outer and inner circumferences, and multiple flow guiding holes inside that connect 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.

4. The primary high-pressure pump according to claim 1, Its features are: The power end has a power output component that moves along the reciprocating motion direction. The hydraulic end also includes a floating connection assembly, which comprises: A connecting component, one end of which is fixed to the power output component, and the other end of which has a receiving groove. The middle part of the bottom surface of the receiving groove is spherical, which is used to abut against one end of the plunger when the power output component moves toward the plunger, so that the thrust output by the power output component is kept acting on the central axis of the plunger. A positioning component is fitted onto the flanged end of the plunger and the connecting component; and The drive component is located at the opening of the receiving groove, and drives the plunger to move when the power output component moves in a direction away from the plunger.

5. The primary high-pressure pump according to claim 1, characterized in that: in, The gearbox has an input end and an output end on both sides, respectively. 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.

6. The primary high-pressure pump according to claim 1, characterized in that: in, 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.

7. The primary high-pressure pump according to claim 1, characterized in that: in, The seawater channel includes a low-pressure inlet located at the lower part of one side of the hydraulic end valve box, an inlet channel communicating with the low-pressure inlet, a high-pressure outlet located at the upper part of one or both sides of the hydraulic end valve box, an outlet channel communicating with the high-pressure outlet, and a pressurized channel connecting the inlet channel and the outlet channel. The plunger is configured correspondingly to the pressurized flow channel. 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 gas.

8. The primary high-pressure pump according to claim 7, characterized in that: in, The hydraulic end valve box includes a main body component and multiple cover components. There are multiple plungers, and there are corresponding multiple pressurized flow channels. Each of the pressurized flow channels is equipped with an inlet valve and an outlet valve at both ends, both of which are one-way valves, used to cooperate with the corresponding plunger to pressurize the seawater. One end of the pressurized flow channel forms an inlet valve maintenance opening on the side of the main tank component, and the other end of the pressurized flow channel forms an outlet valve maintenance opening on the top surface of the main tank component. The plurality of the aforementioned covers are respectively detachably installed at the access openings of the inlet valve and the outlet valve. A seal is provided between the cover and the corresponding one-way valve.

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 single-stage high-pressure pump is used to pressurize seawater; and A reverse osmosis membrane is used to treat pressurized seawater by reverse osmosis, thereby separating concentrated seawater 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 seawater from the seawater. The reverse osmosis mechanism is the reverse osmosis mechanism as described in claim 9.

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