High-pressure pump for seawater desalination

Abstract

The present invention provides a high-pressure pump for seawater desalination, which includes a main shaft driven by a motor, and a multi-stage pressurizing vortex disk structure, a multi-stage pressure compensation vortex disk structure, and a multi-stage energy recovery vortex disk structure that are sequentially and serially installed through the main shaft. Among them, the multi-stage pressurizing vortex disk structure is configured to receive raw seawater from the outside and gradually pressurize the raw seawater under the drive of the main shaft to output high-pressure seawater. The multi-stage pressure compensation vortex disk structure is configured such that each stage of the pressure compensation vortex disk structure can perform pressure compensation on the seawater after reverse osmosis entering it and output the seawater after pressure compensation. The multi-stage energy recovery vortex disk structure is configured to receive the high-pressure concentrated brine after reverse osmosis, and can convert the pressure energy of the high-pressure concentrated brine into the kinetic energy of the main shaft and output low-pressure concentrated brine. The structure of the present invention is simple and compact, occupies a small area, is more conducive to automatic operation control, is convenient for overhaul and maintenance, and improves the service life of the reverse osmosis module and reduces energy consumption.

Description

Technical Field:

[0001] The present invention relates to the technical field of fluid machinery engineering, and particularly to a high-pressure pump for seawater desalination with a novel structure. Background Art:

[0002] At present, almost all seawater desalination processes in China adopt reverse osmosis membranes in series operation. As Figure 1 shown, six-stage reverse osmosis membranes 100 are arranged in series in the protection tube 200. Occasionally, a novel reverse osmosis membrane integrated purification system adopts reverse osmosis membranes in parallel operation. As Figure 2 and Figure 3 shown, this novel reverse osmosis membrane integrated purification system includes a motor 300, a membrane pump integrated separation and purifier 400, a reverse osmosis membrane component 500, a water inlet section 600, a water outlet section 700, a seawater inlet A1, a fresh water collection outlet B1, and a concentrated seawater outlet C1. However, currently, whether it is the Figure 1 series operation mode shown or the Figure 2 and Figure 3 parallel operation mode shown, a high-pressure pump 800 needs to be configured at its inlet. As Figure 4 shown, to meet the osmotic pressure requirements of the reverse osmosis membranes.

[0003] For the process of configuring a high-pressure pump for the old-fashioned reverse osmosis membranes in series operation as Figure 1 shown, it has the following defects: it occupies a large space area and has a high infrastructure investment cost; the pressure inside the reverse osmosis membranes decreases gradually, and the water output of the osmotic membranes decreases gradually, resulting in low separation efficiency (this is because: when seawater enters the first-stage reverse osmosis membrane, the salt concentration is relatively low and the pressure is relatively high. After partially desalinating fresh water through reverse osmosis and entering the next-stage reverse osmosis membrane, the salt concentration will increase gradually. The reverse osmosis membranes at the later stages require a higher reverse osmotic pressure); the utilization rates of the reverse osmosis membranes are not equal, and their service lives are different; the reverse osmosis membranes 100 are installed in the same protection tube 200, which is not conducive to monitoring and maintenance.

[0004] For the process of configuring a high-pressure pump for the novel reverse osmosis membrane integrated purification system as Figure 2 and Figure 3 shown, it has the following defects: this parallel structure occupies a slightly larger space area; the high-pressure pump 800 (see Figure 4 ) and the reverse osmosis membrane integrated purification system are both separately equipped with motor drives, increasing the difficulty of circuit wiring and, to a certain extent, increasing the difficulty of automatic control of the system; the presence of the high-pressure pump 800 increases the number of potential failure points; the high-pressure pump 800 and the motor 300 are independent of each other, which is not conducive to the comprehensive utilization of energy. Summary of the Invention:

[0005] To overcome the above defects, it would be beneficial for the present invention to provide a newly designed high-pressure pump for seawater desalination with a simple, compact structure, easy to control and maintain.

[0006] The main idea of the present invention is to provide a pressurization area (including a multi-stage pressurization vortex disk structure), a pressure compensation area (including a multi-stage pressure compensation vortex disk structure), and an energy recovery area (including a multi-stage energy recovery vortex disk structure) in a high-pressure pump for seawater desalination. Driven by a single motor, through the design of a multi-stage vortex disk through-shaft structure and the staggered arrangement of the inlet and outlet, an appropriate working pressure can be provided for each reverse osmosis membrane module of the seawater desalination unit, thereby greatly improving the freshwater production efficiency and saving energy and reducing consumption (the energy recovery area is a device that converts the high-pressure concentrated brine generated after seawater desalination into low-pressure concentrated brine, and converts the pressure energy into effective shaft work for energy recovery during this process).

[0007] To this end, the present invention provides a high-pressure pump for seawater desalination, which is characterized by including a main shaft driven by a motor, and a multi-stage pressurization vortex disk structure, a multi-stage pressure compensation vortex disk structure, and a multi-stage energy recovery vortex disk structure sequentially and serially installed through the main shaft. Among them, the multi-stage pressurization vortex disk structure is configured to receive raw seawater from the outside and gradually pressurize the raw seawater under the drive of the main shaft to output high-pressure seawater, the multi-stage pressure compensation vortex disk structure is configured that each stage of the pressure compensation vortex disk structure can compensate the seawater after reverse osmosis entering it and output the compensated seawater under the drive of the main shaft, and the multi-stage energy recovery vortex disk structure is configured to receive the high-pressure concentrated brine after reverse osmosis, and can convert the pressure energy of the high-pressure concentrated brine into the kinetic energy of the main shaft and output low-pressure concentrated brine.

[0008] In the present invention, since the structures for pressurization, pressure compensation, and energy recovery are all installed through the same main shaft driven by a single motor, the structure is simple and compact, occupies a small area, is more conducive to automatic operation control, and is convenient for maintenance and repair; the setting of the pressure compensation vortex disk structure can increase the pressure of seawater that does not meet the pressure requirements to meet the output requirements; the multi-stage energy recovery vortex disk structure is connected in series on the main shaft in a through-shaft manner, and the moving vortex disk further drives the main shaft under the action of the high-pressure concentrated brine, realizing the conversion of pressure energy into mechanical energy (shaft work), and the energy recovery efficiency is about 60% - 80%. In this way, conversely, the energy output of the motor driving the main shaft can be reduced, thereby completing energy recovery and further reducing energy consumption.

[0009] Furthermore, the multi-stage pressurization vortex disk structure is provided with a raw seawater inlet and a high-pressure seawater outlet; each stage of the pressure compensation vortex disk structure has a reverse osmosis seawater return port and a compensated seawater output port; the multi-stage energy recovery vortex disk structure is provided with a reverse osmosis interface for receiving high-pressure concentrated brine and a recovered seawater discharge port for externally outputting low-pressure concentrated brine.

[0010] Through the above structural settings, the seawater can be pressurized, timely pressure-compensated, and finally energy-recovered and discharged when passing through the high-pressure pump for seawater desalination.

[0011] Furthermore, the high-pressure pump for seawater desalination is adapted to be connected to a multi-stage reverse osmosis membrane module. Among them, one end of the first-stage reverse osmosis membrane module in the multi-stage reverse osmosis membrane module is communicated with the high-pressure seawater outlet of the multi-stage supercharging scroll structure, and the other end is communicated with the reverse osmosis seawater return port of the first-stage pressure compensation scroll structure of the multi-stage pressure compensation scroll structure. One end of the second-stage reverse osmosis membrane module in the multi-stage reverse osmosis membrane module is communicated with the seawater outlet after pressure compensation of the first-stage pressure compensation scroll structure, and the other end is communicated with the reverse osmosis seawater return port of the second-stage pressure compensation scroll structure of the multi-stage pressure compensation scroll structure. By analogy, until one end of the last-stage reverse osmosis membrane module in the multi-stage reverse osmosis membrane module is communicated with the seawater outlet after pressure compensation of the last-stage pressure compensation scroll structure of the multi-stage pressure compensation scroll structure, and the other end is communicated with the reverse osmosis docking port of the multi-stage energy recovery scroll structure.

[0012] Through the above structural settings, the seawater is pressurized, enters the reverse osmosis membrane module after meeting the pressure requirements, is pressure-compensated after pressure drop and then output to the reverse osmosis membrane module, and the final high-pressure concentrated brine can recover energy in a timely manner.

[0013] Furthermore, each stage of the multi-stage supercharging scroll structure, the multi-stage pressure compensation scroll structure, and the multi-stage energy recovery scroll structure includes a stationary scroll and a rotating scroll that meshes with the stationary scroll to form a closed volume. The adjacent two stages of scroll structures are arranged with the stationary scrolls back-to-back or the rotating scrolls back-to-back. Each rotating scroll is installed on the main shaft through an eccentric bushing and is equipped with an anti-rotation structure.

[0014] By installing the same type of scrolls (i.e., stationary scrolls and stationary scrolls, or rotating scrolls and rotating scrolls) back-to-back, the axial forces generated by each two sets of stationary and rotating scrolls can be balanced with each other; moreover, because the scroll teeth of the scroll structure are processed by special processes and special milling cutters, it can ensure small running clearances and small leaks, thus ensuring a high compression ratio; the setting of the anti-rotation structure can prevent the rotating scroll from rotating.

[0015] Furthermore, a flow distribution plate is installed between the back-to-back installed stationary scrolls, and a cross-ring seat is installed between the back-to-back installed rotating scrolls. The anti-rotation structure is a cross-ring, and both sides of the cross-ring are slidably connected to the cross-ring seat and the rotating scroll respectively.

[0016] Since the stationary scrolls are arranged back-to-back, and the openings of the flow channels on the stationary scrolls are usually not in the same position, the setting of the flow distribution plate can be used to change the fluid flow direction and ensure the smooth flow of the fluid between adjacent two stages of scroll structures.

[0017] Furthermore, in the multi-stage supercharging vortex disk structure, each stationary vortex disk is provided with a central flow channel communicating with the center of the corresponding closed volume and a peripheral flow channel communicating with the periphery of the closed volume. The stationary vortex disk of the previous-stage supercharging vortex disk structure in two adjacent stages of the supercharging vortex disk structure is provided with a low-pressure fluid inlet communicating with the peripheral flow channel of the stationary vortex disk, and the stationary vortex disk of the next-stage supercharging vortex disk structure is provided with a high-pressure fluid outlet. Moreover, the low-pressure fluid inlet in the first-stage supercharging vortex disk structure of the multi-stage supercharging vortex disk structure constitutes the raw seawater inlet, and the high-pressure fluid outlet in the last-stage supercharging vortex disk structure constitutes the high-pressure seawater outlet; the distribution disk is provided with a previous-stage distribution channel and a next-stage distribution channel. The previous-stage distribution channel is respectively communicated with the central flow channel in the previous-stage supercharging vortex disk structure and the peripheral flow channel in the next-stage supercharging vortex disk structure, and the next-stage distribution channel is respectively communicated with the central flow channel in the next-stage supercharging vortex disk structure and the high-pressure fluid outlet on the stationary vortex disk of the next-stage supercharging vortex disk structure; the cross-ring seat is provided with a conveying flow channel, one end of which is communicated with the high-pressure fluid outlet of the next-stage supercharging vortex disk structure and the other end of which is communicated with the low-pressure fluid inlet in the previous-stage supercharging vortex disk structure of the next adjacent two-stage supercharging vortex disk structure.

[0018] Through the above structural arrangement, the raw seawater entering the multi-stage supercharging vortex disk structure can smoothly enter the next-stage supercharging vortex disk structure from the previous-stage supercharging vortex disk structure and be continuously pressurized; moreover, since the vortex disk structure is used for fluid compression, the change in the volume in the compression chamber is continuous, so the driving torque change is small and the power change is small, thereby reducing the running vibration, lowering the noise, and improving the running reliability.

[0019] Still further, in the multi-stage pressure-compensating vortex disk structure, the distribution disk is provided with a distribution channel for each stage of the pressure-compensating vortex disk structure in two adjacent stages. In each stage of the pressure-compensating vortex disk structure, the stationary vortex disk is provided with a central flow channel communicating with the center of the closed volume and a peripheral flow channel communicating with the periphery of the closed volume. The stationary vortex disk is further provided with a reverse osmosis seawater return port communicating with the peripheral flow channel and a post-pressure-compensation seawater outlet communicating with the central channel via the corresponding distribution channel.

[0020] Through the above structural arrangement, each stage of the pressure-compensating vortex disk structure can compensate the pressure of the seawater after reverse osmosis entering it; moreover, since the vortex disk structure is used for fluid compression, the change in the volume in the compression chamber is continuous, so the driving torque change is small and the power change is small, thereby reducing the running vibration, lowering the noise, and improving the running reliability.

[0021] Furthermore, in the multi-stage energy recovery vortex disk structure, each stationary vortex disk is provided with a central flow channel communicating with the center of the corresponding closed volume and a peripheral flow channel communicating with the periphery of the closed volume. A high-pressure fluid inlet is provided on the stationary vortex disk of the previous stage of energy recovery vortex disk structure of every two adjacent multi-stage energy recovery vortex disk structures. The high-pressure fluid inlet on the stationary vortex disk of the first-stage vortex disk structure of the multi-stage energy recovery vortex disk structure constitutes the reverse osmosis docking port. The peripheral flow channel on the stationary vortex disk of the last-stage energy recovery vortex disk structure is communicated with the recovered seawater discharge port. The distribution disk is provided with a previous-stage distribution channel and a subsequent-stage distribution channel. The previous-stage distribution channel is respectively communicated with the high-pressure fluid inlet and the central flow channel in the previous stage of energy recovery vortex disk structure of the two adjacent multi-stage energy recovery vortex disk structures. The subsequent-stage distribution channel is respectively communicated with the peripheral flow channel in the previous stage of energy recovery vortex disk structure and the central flow channel of the subsequent stage of energy recovery vortex disk structure of the two adjacent multi-stage energy recovery vortex disk structures. A conveying flow channel is provided on the cross ring seat. One end of the conveying flow channel is communicated with the peripheral flow channel of the subsequent stage of energy recovery vortex disk structure, and the other end is communicated with the high-pressure fluid inlet of the previous stage of energy recovery vortex disk structure of the next adjacent two-stage energy recovery vortex disk structure.

[0022] Through the above structural arrangement, the high-pressure concentrated brine first enters the center of the closed volume of the first-stage energy recovery vortex disk structure, thereby driving the moving vortex disk of the first-stage energy recovery vortex disk structure to rotate for the first pressure reduction, and then being sent out through the periphery of the closed volume of the first-stage energy recovery vortex disk structure. Then it enters the center of the closed volume of the second-stage energy recovery vortex disk structure, thereby driving the moving vortex disk of the second-stage energy recovery vortex disk structure to rotate and perform the second pressure reduction, and then being output through the periphery of the closed volume of the second-stage energy recovery vortex disk structure. Then it enters the center of the closed volume of the third-stage energy recovery vortex disk structure, and so on, performing stage-by-stage pressure reduction to finally obtain low-pressure concentrated brine.

[0023] Furthermore, the above-mentioned high-pressure pump for seawater desalination further includes a counterweight disk, which is arranged in an eccentric structure opposite to the eccentric bushing.

[0024] The setting of the counterweight disk can be used to balance the centrifugal inertia force generated by the eccentric bushing.

[0025] Furthermore, both ends of the main shaft are supported by bearing seats. End covers are installed between the bearing seats and the first-stage pressurizing vortex disk structure of the multi-stage pressurizing vortex disk structure and between the bearing seats and the last-stage energy recovery vortex disk structure of the multi-stage energy recovery vortex disk structure. Anti-rotation structures are installed between the moving vortex disk in the first-stage pressurizing vortex disk structure and the corresponding end cover and between the moving vortex disk in the last-stage energy recovery vortex disk structure and the corresponding end cover.

[0026] The setting of the end cover plays a role in sealing and protecting the multi-stage vortex disk structure on the one hand, and plays a role in installing the anti-rotation structure for the moving vortex disk on the other hand.

[0027] Furthermore, the anti-rotation structure is a cross ring. Cross ring chutes are provided on both the moving scroll and the end cover. The cross ring is slidably connected to the cross ring chute of the moving scroll and the cross ring chute of the end cover on both sides thereof.

[0028] Through the above structural arrangement, the moving scroll can only operate along a fixed trajectory and cannot rotate by itself.

[0029] Still further, the number of stages of the multi-stage pressurizing scroll structure is determined by the magnitude of the input pressure required by the first-stage reverse osmosis membrane module; the number of stages of the multi-stage energy recovery scroll structure is determined by the magnitude of the output pressure from the last-stage reverse osmosis membrane module.

[0030] For the multi-stage pressurizing scroll structure, its operating pressure depends on the load, that is, the pressure requirement of the multi-stage reverse osmosis module group. However, since the clearance requirements for meshing between the pressurizing scrolls, the strength of the material, and the sealing requirements of the mechanism will all limit the upper limit of the pressure it pumps, the upper limit of the pump pressure can be increased by increasing the number of stages of the pressurizing scroll structure; for the multi-stage energy recovery scroll structure, the number of stages of the energy recovery scroll structure can be appropriately increased or decreased according to the pressure of the high-pressure concentrated brine introduced therein. If the pressure is high, the number of stages of the energy recovery scroll structure is increased, and if the pressure is low, the number of stages of the energy recovery scroll structure is decreased.

[0031] Still further, a filtering device is provided at the raw seawater inlet.

[0032] By providing the filtering device, large particle impurities can be effectively prevented from entering the seawater desalination high-pressure pump and causing excessive wear to the scroll structure.

[0033] These and other aspects of the present invention will be more clearly elaborated by referring to the embodiments described below. Description of the Drawings:

[0034] The structure of the present invention and further objects and advantages will be better understood from the following description in conjunction with the drawings, in which like reference numerals identify like elements:

[0035] Figure 1 is a simple schematic diagram of an existing seawater desalination device in which the reverse osmosis module groups are arranged in series;

[0036] Figure 2 is a structural schematic diagram of an existing new reverse osmosis membrane integrated purification system in which the reverse osmosis module groups are arranged in parallel;

[0037] Figure 3 is Figure 2 a side view of the reverse osmosis membrane integrated purification system shown in

[0038] Figure 4 is Figure 2 A schematic structural view of the high-pressure pump used in

[0039] Figure 5 It schematically shows a cross-sectional view of the internal structure of a high-pressure pump for seawater desalination according to a specific embodiment of the present invention;

[0040] Figure 6 is Figure 5 An enlarged view of the multi-stage supercharging scroll structure of the seawater desalination high-pressure pump shown;

[0041] Figure 7 is Figure 5 An enlarged view of the multi-stage pressure-compensating scroll structure of the seawater desalination high-pressure pump shown;

[0042] Figure 8 is Figure 5 An enlarged view of the multi-stage energy recovery scroll structure of the seawater desalination high-pressure pump shown. Specific embodiments:

[0043] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present invention, which can be embodied in various forms. Therefore, the specific details disclosed herein are not considered restrictive, but merely as the basis for the claims and as a representative basis for teaching those skilled in the art to apply the present invention in any appropriate manner in practice, including adopting various features disclosed herein and combining features that may not be explicitly disclosed herein.

[0044] It should be noted that in this article, the directional representations used to explain the structures and / or movements of the various parts of the disclosed embodiments, such as "left", "right", "front", "rear", etc., are not absolute, but relative. When the various parts of the disclosed embodiments are in the positions shown in the figures, these representations are appropriate. If the positions or reference systems of the disclosed embodiments change, these representations will also change according to the changes in the positions or reference systems of the disclosed embodiments.

[0045] As Figure 5 shown, a high-pressure pump for seawater desalination according to a specific embodiment of the present invention includes a lower bearing seat 10, an upper bearing seat 12, a stationary scroll 2, a distribution plate 3, a moving scroll 4, a cross ring 5, an eccentric bushing 6, a cross ring seat 7, a lower end cover 80, an upper end cover 82, and a main shaft 9. The stationary scroll 2 and the moving scroll 4 appear in pairs, and each pair of the stationary scroll 2 and the moving scroll 4 constitutes a stage of scroll structure. The moving scroll 4 meshes with the stationary scroll 2 to form a closed volume 24. The main shaft 9 is driven by a motor (not shown in the figure). If this high-pressure pump for seawater desalination is installed and used vertically, the motor is installed at the upper end of the main shaft 9.

[0046] For another example Figure 5 As shown, the high-pressure pump for seawater desalination includes a multi-stage boosting vortex disk structure 11, a multi-stage pressure compensation vortex disk structure 13, and a multi-stage energy recovery vortex disk structure 15. These vortex disk structures are sequentially installed in series through the main shaft 9. Figure 5 In the specific embodiment shown, the high-pressure pump for seawater desalination is adapted to be used in cooperation with a multi-stage reverse osmosis membrane module 17.

[0047] In this embodiment, as Figure 5 shown, whether it is the multi-stage boosting vortex disk structure 11, the multi-stage pressure compensation vortex disk structure 13, or the multi-stage energy recovery vortex disk structure 15, the vortex disk structures therein are arranged such that either the dynamic vortex disks 4 are installed back-to-back or the static vortex disks 2 are installed back-to-back for adjacent two-stage vortex disk structures. The functions of such a design for adjacent two dynamic vortex disks are: 1) The cross rings 5 can share the same cross ring seat 7, which greatly reduces the volume, simplifies the structure, and reduces the cost; 2) Such back-to-back installation enables the axial forces generated by each two groups of dynamic and static vortex disks to be balanced with each other. For the dynamic vortex disks 4 at both ends, the cross rings 5 used can be installed on the lower end cover 80 and the upper end cover 82. It should be understood that the distribution disk 3 located between the two static disks 2 is used to change the water flow direction.

[0048] In addition, in this embodiment, the high-pressure pump for seawater desalination may further include a counterweight disk (not shown in the figure) according to needs. The counterweight disk is arranged in an eccentric structure opposite to the eccentric bushing 6 to play a role in balancing the weight.

[0049] As Figure 5 shown, in this embodiment, the multi-stage boosting vortex disk structure 11 includes the first-stage to fourth-stage vortex disk structures from left to right. These four-stage boosting vortex disk structures 11 are arranged to receive the raw seawater from the outside and gradually pressurize the raw seawater under the drive of the main shaft 9, so as to provide high-pressure seawater to the first-stage reverse osmosis membrane module 17 of the multi-stage reverse osmosis membrane module 17; the multi-stage pressure compensation vortex disk structure 13 includes the fifth-stage to eighth-stage vortex disk structures from left to right, and is arranged such that: under the drive of the main shaft 9, each stage of the pressure compensation vortex disk structure pressurizes the seawater after reverse osmosis from the corresponding stage of the reverse osmosis membrane module and provides it to the next-stage reverse osmosis membrane module; the multi-stage energy recovery vortex disk structure 15 includes the ninth-stage to fourteenth-stage vortex disk structures from left to right, that is, the first-stage to sixth-stage vortex disk structures from right to left. It is arranged to be able to receive the high-pressure concentrated brine from the last-stage reverse osmosis membrane module 17 of the multi-stage reverse osmosis membrane module 17, and be able to convert the pressure energy of the high-pressure concentrated brine into the kinetic energy of the main shaft 9, and produce low-pressure concentrated brine.

[0050] As Figure 5 shown, and referring to Figure 6 , the four-stage boosting vortex disk structure 11 is provided with a raw seawater inlet A and a high-pressure seawater outlet B. AsFigure 5 as shown in and with reference to Figure 7 , each stage of the pressure-compensating vortex disk structure 13 has a reverse osmosis seawater return port and a seawater output port after pressure compensation. In this embodiment, the reverse osmosis seawater return port of the first-stage pressure-compensating vortex disk structure 13 is represented by C, and the seawater output port after pressure compensation is represented by D; the reverse osmosis seawater return port of the second-stage pressure-compensating vortex disk structure 13 is represented by E, and the seawater output port after pressure compensation is represented by F; the reverse osmosis seawater return port of the third-stage pressure-compensating vortex disk structure 13 is represented by G, and the seawater output port after pressure compensation is represented by H; the reverse osmosis seawater return port of the fourth-stage pressure-compensating vortex disk structure 13 is represented by I, and the seawater output port after pressure compensation is represented by J. As Figure 5 shown in and with reference to Figure 8 , the six-stage energy recovery vortex disk structure 15 is provided with a reverse osmosis docking port K for receiving high-pressure concentrated brine and a recovered seawater discharge port L for externally outputting low-pressure concentrated brine.

[0051] Again, as Figure 5 shown in, each stage of the five-stage reverse osmosis membrane module 17 is configured to perform reverse osmosis on high-pressure seawater to produce fresh water, and has a membrane module inlet and a membrane module outlet. Among them, the membrane module inlet of the first-stage reverse osmosis membrane module 17 is communicated with the high-pressure seawater outlet B on the last stage, i.e., the fourth-stage pressurizing vortex disk structure 11; the membrane module outlet of the last stage, i.e., the fifth-stage reverse osmosis membrane module 17, is communicated with the reverse osmosis docking port K of the six-stage energy recovery vortex disk structure 15; the other membrane module outlets are respectively communicated with the corresponding reverse osmosis seawater return ports on the four-stage pressure-compensating vortex disk structure 13; and the other membrane module inlets are respectively communicated with the corresponding seawater output ports after pressure compensation on the four-stage pressure-compensating vortex disk structure 13.

[0052] As Figure 5 shown in, specifically, the connection modes of the other membrane module outlets and membrane module inlets in this embodiment are as follows: the membrane module outlet of the first-stage reverse osmosis membrane module 17 is communicated with the reverse osmosis seawater return port C of the first-stage pressure-compensating vortex disk structure 13; the seawater output port D after pressure compensation of the first-stage pressure-compensating vortex disk structure 13 is communicated with the membrane module inlet of the second-stage reverse osmosis membrane module 17; the membrane module outlet of the second-stage reverse osmosis membrane module 17 is communicated with the reverse osmosis seawater return port E of the second-stage pressure-compensating vortex disk structure 13; the seawater output port F after pressure compensation of the second-stage pressure-compensating vortex disk structure 13 is communicated with the membrane module inlet of the third-stage reverse osmosis membrane module 17; the membrane module outlet of the third-stage reverse osmosis membrane module 17 is communicated with the reverse osmosis seawater return port G of the third-stage pressure-compensating vortex disk structure 13; the seawater output port H after pressure compensation of the third-stage pressure-compensating vortex disk structure 13 is communicated with the membrane module inlet of the fourth-stage reverse osmosis membrane module 17; the membrane module outlet of the fourth-stage reverse osmosis membrane module 17 is communicated with the reverse osmosis seawater return port I of the last stage, i.e., the fourth-stage pressure-compensating vortex disk structure 13; and the seawater output port J after pressure compensation of the fourth-stage pressure-compensating vortex disk structure 13 is communicated with the membrane module inlet of the fifth-stage reverse osmosis membrane module 17.

[0053] As Figure 6As shown, in this embodiment, the meshing teeth of the stationary scroll 2 and the meshing teeth of the rotating scroll 4 in each stage of the supercharging scroll structure 11 mesh with each other to form a closed volume 24 for compressing fluid. These supercharging scroll structures 11 are arranged such that the rotating scroll 4 rotates driven by the main shaft 9, so that the low-pressure fluid, i.e., the raw seawater, entering the seawater desalination high-pressure pump via the raw seawater inlet A is pressurized into high-pressure fluid, i.e., high-pressure seawater, after passing through four stages of supercharging scroll structures 11, and then is output via the high-pressure seawater outlet B on the last stage of the supercharging scroll structure 11 to the first-stage reverse osmosis membrane module 17 (see Figure 5 ). This "axial-through series" structure of the multi-stage supercharging scroll structure can achieve high-pressure output of seawater.

[0054] As Figure 6 shown, in the multi-stage supercharging scroll structure 11, a central flow channel 21 communicating with the center of the corresponding closed volume 24 and a peripheral flow channel 23 communicating with the periphery of the closed volume 24 are provided on each stationary scroll 2. A low-pressure fluid inlet communicating with the peripheral flow channel 23 of the stationary scroll 2 of the previous stage of the adjacent two-stage supercharging scroll structure 11 is provided on the stationary scroll 2 of the previous stage of the supercharging scroll structure 11 (in the first-stage supercharging scroll structure 11, this low-pressure fluid inlet is also called the raw seawater inlet A, and in the supercharging scroll structures 11 of other stages, i.e., the third-stage supercharging scroll structure 11, the low-pressure fluid inlet is represented by the number 20), and a high-pressure fluid outlet is provided on the stationary scroll 2 of the next stage of the supercharging scroll structure 11 (in the last stage, i.e., the fourth-stage supercharging scroll structure 11, this high-pressure fluid outlet is also called the high-pressure seawater outlet B, and in the supercharging scroll structures 11 of other stages, the high-pressure fluid outlet is represented by the number 22).

[0055] Again, as Figure 6 shown, in the four-stage supercharging scroll structure 11, there are two distribution disks 3 respectively located between the first and second stages of the supercharging scroll structure and between the third and fourth stages of the supercharging scroll structure. Each distribution disk 3 is provided with a pre-stage distribution channel 31 and a post-stage distribution channel 33. Taking the distribution disk 3 between the first and second stages of the supercharging scroll structure as an example, the pre-stage distribution channels 31 on it are respectively communicated with the central flow channel 21 in the first-stage supercharging scroll structure 11 and the peripheral flow channel 23 in the second-stage supercharging scroll structure 11, and the post-stage distribution channels 33 are respectively communicated with the central flow channel 21 in the second-stage supercharging scroll structure 11 and the high-pressure fluid outlet 22 on the stationary scroll 2 of the second-stage supercharging scroll structure 11; a conveying flow channel 70 is provided on the cross ring seat 7, and one end of this conveying flow channel 70 is communicated with the high-pressure fluid outlet 22 of the second-stage supercharging scroll structure 11, and the other end is communicated with the low-pressure fluid inlet 20 in the previous stage of the next adjacent two-stage supercharging scroll structure 11, i.e., the third-stage supercharging scroll structure 11.

[0056] As Figure 6 shown, and referring toFigure 5 , the raw seawater enters the four - stage supercharging scroll structure 11 of the seawater desalination high - pressure pump from the raw seawater inlet A. First, it enters the closed volume 24 of the first - stage supercharging scroll structure 11 through the peripheral flow channel 23, is pressurized after passing through the first - stage supercharging scroll structure 11, and then shoots out from the central flow channel 21 on the static scroll 2; then it enters the second - stage supercharging scroll structure 11 on the right through the pre - stage distribution channel 31 on the distribution disk 3, that is, enters the second - stage supercharging scroll structure 11 through the peripheral flow channel 23 on the static scroll 2 of the second - stage supercharging scroll structure 11; after the seawater is pressurized by the second - stage supercharging scroll structure 11, it shoots out through the central flow channel 21 on the static scroll 2 of the second - stage supercharging scroll structure 11, enters the post - stage distribution channel 33 of the distribution disk 3, and enters the low - pressure fluid inlet 20 of the third - stage supercharging scroll structure 11 on the right through the high - pressure fluid outlet 22 on the static scroll 2 of the second - stage supercharging scroll structure 11 and the flow channel 70 on the cross - ring seat 7, and then enters the third - stage scroll structure through the peripheral flow channel 23 of the third - stage supercharging scroll structure 11; after the seawater is pressurized by the third - stage supercharging scroll structure 11, it then shoots out through the central flow channel 21 of the third - stage supercharging scroll structure 11; then it enters the peripheral flow channel 23 of the fourth - stage supercharging scroll structure 11 on the right through the pre - stage distribution channel 31 on the distribution disk 3, thus entering the closed volume 24 of the fourth - stage supercharging scroll structure; after the seawater is pressurized by the fourth - stage supercharging scroll structure 11, it shoots out through the central flow channel 21 of the fourth - stage supercharging scroll structure 11, enters the post - stage distribution channel 33 of the distribution disk 3, and then enters the first - stage reverse osmosis membrane module 17 through the high - pressure seawater outlet B on the static scroll 2 of the fourth - stage supercharging scroll structure 11. It should be understood that seawater can play the role of taking away frictional heat and lubrication.

[0057] It should be noted that, as Figure 5 and Figure 6 shown, in the multi - stage supercharging scroll structure 11, the moving scroll 4 is installed on the main shaft 9 through the eccentric bushing 6. Through the action of the eccentric bushing 6, the scroll teeth of the moving scroll 4 swing in the scroll teeth of the static scroll 2, so that the closed volume 24 formed between the scroll teeth of the moving scroll 4 and the scroll teeth of the static scroll 2 undergoes a periodic change from large to small, realizing the suction, compression, and discharge of the fluid. In this embodiment, the main shaft 9 is transmitted to the moving scroll 4 through a key (not shown in the figure) and the eccentric bushing 6.

[0058] As Figure 5 and Figure 6As shown, the cross ring 5 constitutes an anti-rotation structure of the moving scroll 4 in this embodiment. Its two ends are respectively stuck in the cross ring chutes (not shown in the figure) of the moving scroll 4 and the cross ring seat 7 (not shown in the figure), playing a role in limiting. It should be noted that a filtering device (not shown in the figure) is preferably added at the original seawater inlet A on the stationary scroll 2 of the first-stage supercharging scroll structure 11 to prevent larger particles from excessively wearing the scroll structure. The upper limit of the pressure during the operation of each stage of the supercharging scroll structure can also be better controlled by setting a pressure relief port (not shown in the figure) on each stationary scroll 2 and adjusting this pressure relief port (for example, by installing a pressure regulating valve on this pressure relief port to achieve pressure regulation), which is safe and reliable.

[0059] In addition, although as Figure 6 shown, when looking at the four-stage supercharging scroll structure 11 from left to right, it is: moving scroll 4, stationary scroll 2; distribution disk 3; stationary scroll 2, moving scroll 4; cross ring seat 7; moving scroll 4, stationary scroll 2; distribution disk 3; stationary scroll 2, moving scroll 4. However, these four-stage supercharging scroll structures 11 can also be: stationary scroll 2, moving scroll 4; cross ring seat 7; moving scroll 4, stationary scroll 2; distribution disk 3; stationary scroll 2, moving scroll 4; cross ring seat 7; moving scroll 4, stationary scroll 2. Moreover, the number of stages of the supercharging scroll structure 11 can also be changed arbitrarily. For example, the supercharging scroll structure can be two-stage, three-stage, or it can also be five-stage, six-stage, etc., and the number of stages can be either odd or even, as long as it is determined according to the magnitude of the seawater pressure required by the first-stage reverse osmosis membrane module behind.

[0060] As Figure 7 shown, and referring to Figure 5 , in this embodiment, the multi-stage pressure compensation scroll structure 13 is a four-stage scroll structure installed in series (but each has its own inlet and outlet). Different from the multi-stage supercharging scroll structure 11 shown in Figure 6 , there are two flow distribution channels 30 provided on the distribution disk 3 configured in these four-stage pressure compensation scroll structures 13, that is, one flow distribution channel 30 is provided for each stage of the pressure compensation scroll structure of two adjacent stages of the pressure compensation scroll structures. In each stage of the pressure compensation scroll structure 13, a central flow channel 21 and a peripheral flow channel 23 are provided on the stationary scroll 2. Among them, the central flow channel 21 is connected to the center of the closed volume 24 of this stage of the pressure compensation scroll structure 13, while the peripheral flow channel 23 is connected to the periphery of this closed volume 24. The stationary scroll 2 is also provided with a reverse osmosis seawater return port (identified by C, E, G, I in Figure 7 ) communicating with the peripheral flow channel 23, and a seawater output port after pressure compensation (identified by D, F, H, J in Figure 7 ) communicating with the central channel 21 via the flow distribution channel 30.

[0061] As Figure 8 shown, and referring to Figure 5In this embodiment, the multi-stage energy recovery scroll structure 15 is a six-stage scroll structure. Figure 6 The difference between the multi-stage boost scroll structure 11 shown is that, in each energy recovery scroll structure 15, the vortex teeth of the movable scroll 4 can swing in the vortex teeth of the fixed scroll 2 under the pressure of high-pressure seawater, so that the closed volume 24 formed between the vortex teeth of the movable scroll 4 and the vortex teeth of the fixed scroll 2 undergoes a periodic change from small to large, thereby realizing the discharge, release and suction of the fluid, thereby realizing that the movable scroll 4 drives the main shaft 9 through the action of the eccentric sleeve 6, that is, converts the kinetic energy of the movable scroll 4 into the kinetic energy of the main shaft 9, which can reduce the energy output of the motor driving the main shaft 9 and save energy.

[0062] like Figure 8 As shown, in the six-stage energy recovery scroll structure 15, each fixed scroll 2 is provided with a central flow channel 21 and a peripheral flow channel 23, the central flow channel 21 is connected to the center of the closed volume 24 corresponding to the fixed scroll 2, and the peripheral flow channel 23 is connected to the periphery of the closed volume 24. In the previous energy recovery scroll structure of each adjacent two-stage energy recovery scroll structure 15, that is, in the first, third, and fifth stage energy recovery scroll structures, a high-pressure fluid inlet is provided on the fixed scroll 2, wherein the high-pressure fluid inlet is located at Figure 8 The high-pressure fluid inlet on the fixed vortex 2 of the first-stage energy recovery scroll structure 15 on the left side constitutes a reverse osmosis docking port K, and the high-pressure fluid inlets in the third-stage and fifth-stage energy recovery scroll structures are marked with number 20. The peripheral flow channel 23 on the fixed vortex 2 of the last-stage, sixth-stage energy recovery scroll structure 15 is connected to the recovered seawater discharge port L.

[0063] In the multi-stage energy recovery scroll structure 15, a distribution plate 3 is provided between the first-stage and second-stage energy recovery scroll structures, between the third-stage and fourth-stage energy recovery scroll structures, and between the fifth-stage and sixth-stage energy recovery scroll structures. Taking the distribution plate 3 between the first-stage and second-stage energy recovery scroll structures as an example, a front-stage distribution channel 31 and a rear-stage distribution channel 33 are provided thereon, and the front-stage distribution channel 31 is respectively connected to the high-pressure fluid inlet, i.e., the reverse osmosis docking port K, and the central flow channel 21 in the first-stage energy recovery scroll structure, and the rear-stage distribution channel 33 is respectively connected to the peripheral flow channel 23 in the first-stage energy recovery scroll structure and the central flow channel 21 of the second-stage energy recovery scroll structure.

[0064] In the multi-stage energy recovery vortex disk structure 15, a cross ring seat 7 is arranged between the first adjacent two-stage energy recovery vortex disk structure and the second adjacent two-stage energy recovery vortex disk structure, and between the second adjacent two-stage energy recovery vortex disk structure and the third adjacent two-stage energy recovery vortex disk structure. That is to say, a cross ring seat 7 is arranged between the second-stage and third-stage energy recovery vortex disks, and between the fourth-stage and fifth-stage energy recovery vortex disks, and a conveying channel 70 is arranged thereon. Taking the cross ring seat 7 between the second-stage and third-stage energy recovery vortex disks as an example, the position connection relationship of the conveying channel 70 is described as follows: one end of the conveying channel 70 thereon is communicated with the peripheral channel 23 of the second-stage energy recovery vortex disk structure, and the other end is communicated with the high-pressure fluid inlet 20 of the third-stage energy recovery vortex disk structure.

[0065] Coming back again as Figure 5 shown, it should be noted that in this embodiment, the first-stage reverse osmosis membrane module 17 includes two reverse osmosis membrane modules, and each of the second-stage to fifth-stage reverse osmosis membrane modules 17 includes one reverse osmosis membrane module. However, it should be understood that each stage of the reverse osmosis membrane module may only include one reverse osmosis membrane module. In this embodiment, the reverse osmosis membrane module is the reverse osmosis membrane, and they are independently arranged in a single membrane shell for easy maintenance and repair.

[0066] Generally speaking, the multi-stage pressurizing vortex disk structure 11 can meet the pressure required for reverse osmosis. Then, the high-pressure seawater enters the reverse osmosis membrane module 17. After passing through the reverse osmosis membrane module, the water pressure drops and the seawater salt concentration rises, and a higher osmotic pressure is required to carry out the next-stage reverse osmosis operation normally; the multi-stage pressure supplementing vortex disk structure 13 supplements the pressure of the relatively concentrated seawater separated by the previous-stage reverse osmosis membrane module to make its pressure reach the osmotic pressure required for the operation of the next-stage reverse osmosis membrane module. It should be understood that only multi-stage pressure supplementation is required to achieve after passing through the multi-stage reverse osmosis membrane module, and different output amounts can be easily obtained by increasing or decreasing the number of stages of the reverse osmosis membrane module. The multi-stage energy recovery vortex disk structure is a device that converts the high-pressure concentrated brine generated after seawater desalination into low-pressure concentrated brine, converts the pressure energy into kinetic energy for energy recovery, that is, the energy recovery vortex disk structure is not driven by a motor, but is driven by the pressure of the high-pressure concentrated brine after seawater desalination, and converts the pressure energy into effective shaft work, saving energy and reducing consumption.

[0067] It should be noted that the high-pressure seawater pump of the present invention belongs to a positive displacement pump, and the operating pressure depends on the load. However, the requirements for the meshing clearance between the vortex disks, the strength of the material, and the sealing requirements of the mechanism often limit the upper limit of the pump pressure. And increasing the number of stages of the vortex disk structure to increase the upper limit of the pump pressure is an effective means proposed by the present invention. Devices similar to the present invention that increase or decrease the number of stages of the vortex disk structure by the "shaft-passing" method should fall within the scope of protection of the present invention.

[0068] The technical content and features of the present invention have been disclosed above. However, it can be understood that, under the creative concept of the present invention, those skilled in the art can make various changes and improvements to the above structure, including combinations of the technical features separately disclosed or claimed herein, and other combinations that obviously include these features. These variations and / or combinations all fall within the technical field involved in the present invention and within the scope of protection of the claims of the present invention.

Claims

1. A high-pressure pump for seawater desalination, characterized in that, It includes a main shaft driven by a motor, and a multi-stage supercharging vortex disk structure, a multi-stage supplementary pressure vortex disk structure, and a multi-stage energy recovery vortex disk structure that are sequentially and serially installed through the main shaft. Among them, the multi-stage supercharging vortex disk structure is configured to receive raw seawater from the outside and gradually pressurize the raw seawater under the drive of the main shaft to output high-pressure seawater. The multi-stage supplementary pressure vortex disk structure is configured such that each stage of the supplementary pressure vortex disk structure can supplement the pressure of the seawater after reverse osmosis entering it and output the seawater after supplementary pressure. The multi-stage energy recovery vortex disk structure is configured to receive the high-pressure concentrated brine after reverse osmosis, and can convert the pressure energy of the high-pressure concentrated brine into the kinetic energy of the main shaft and output low-pressure concentrated brine; the multi-stage supercharging vortex disk structure is provided with a raw seawater inlet and a high-pressure seawater outlet; each stage of the supplementary pressure vortex disk structure has a reverse osmosis seawater return port and a seawater outlet after supplementary pressure; the multi-stage energy recovery vortex disk structure is provided with a reverse osmosis docking port for receiving the high-pressure concentrated brine and a recovered seawater discharge port for externally outputting the low-pressure concentrated brine; each stage of the vortex disk structure of the multi-stage supercharging vortex disk structure, the multi-stage supplementary pressure vortex disk structure, and the multi-stage energy recovery vortex disk structure includes a stationary vortex disk and a moving vortex disk that meshes with the stationary vortex disk to form a closed volume. Adjacent two-stage vortex disk structures are arranged such that the stationary vortex disks are installed back to back or the moving vortex disks are installed back to back. Each moving vortex disk is installed on the main shaft through an eccentric bushing and is equipped with an anti-rotation structure; a flow distribution disk is installed between the stationary vortex disks installed back to back, and a cross ring seat is installed between the moving vortex disks installed back to back. The anti-rotation structure is a cross ring, and both sides of the cross ring are slidably connected to the cross ring seat and the moving vortex disk respectively; in the multi-stage supercharging vortex disk structure, each stationary vortex disk is provided with a central flow channel communicating with the center of the corresponding closed volume and a peripheral flow channel communicating with the periphery of the closed volume. The stationary vortex disk of the previous stage of the supercharging vortex disk structure of adjacent two-stage supercharging vortex disk structures is provided with a low-pressure fluid inlet communicating with the peripheral flow channel of the stationary vortex disk, and the stationary vortex disk of the next stage of the supercharging vortex disk structure is provided with a high-pressure fluid outlet. Moreover, the low-pressure fluid inlet in the first-stage supercharging vortex disk structure of the multi-stage supercharging vortex disk structure constitutes the raw seawater inlet, and the high-pressure fluid outlet in the last-stage supercharging vortex disk structure constitutes the high-pressure seawater outlet; the flow distribution disk is provided with a pre-stage flow distribution channel and a post-stage flow distribution channel. The pre-stage flow distribution channel is respectively communicated with the central flow channel in the previous stage of the supercharging vortex disk structure and the peripheral flow channel in the next stage of the supercharging vortex disk structure. The post-stage flow distribution channel is respectively communicated with the central flow channel in the next stage of the supercharging vortex disk structure and the high-pressure fluid outlet on the stationary vortex disk of the next stage of the supercharging vortex disk structure; the cross ring seat is provided with a conveying flow channel, one end of which is communicated with the high-pressure fluid outlet of the next stage of the supercharging vortex disk structure, and the other end is communicated with the low-pressure fluid inlet in the previous stage of the supercharging vortex disk structure of the next adjacent two-stage supercharging vortex disk structure;Among them, a counterweight disk is further included, and the counterweight disk is configured to have an eccentric structure opposite to that of the eccentric bushing.

2. The high-pressure pump for seawater desalination according to claim 1, characterized in that, the high-pressure pump for seawater desalination is adapted to be connected to a multi-stage reverse osmosis membrane module. Among them, one end of the first-stage reverse osmosis membrane module in the multi-stage reverse osmosis membrane module is communicated with the high-pressure seawater outlet of the multi-stage supercharging vortex disk structure, and the other end is communicated with the reverse osmosis seawater return port of the first-stage pressure compensation vortex disk structure of the multi-stage pressure compensation vortex disk structure. One end of the second-stage reverse osmosis membrane module in the multi-stage reverse osmosis membrane module is communicated with the pressure-compensated seawater output port of the first-stage pressure compensation vortex disk structure, and the other end is communicated with the reverse osmosis seawater return port of the second-stage pressure compensation vortex disk structure of the multi-stage pressure compensation vortex disk structure, and so on, until one end of the last-stage reverse osmosis membrane module in the multi-stage reverse osmosis membrane module is communicated with the pressure-compensated seawater output port of the last-stage pressure compensation vortex disk structure of the multi-stage pressure compensation vortex disk structure, and the other end is communicated with the reverse osmosis docking port of the multi-stage energy recovery vortex disk structure.

3. The high-pressure pump for seawater desalination according to claim 1, characterized in that, in the multi-stage pressure compensation vortex disk structure, a flow distribution channel is provided on the flow distribution disk for each stage of the pressure compensation vortex disk structure of adjacent two stages. In each stage of the pressure compensation vortex disk structure, a central flow channel communicating with the center of the closed volume and a peripheral flow channel communicating with the periphery of the closed volume are provided on the static vortex disk. The static vortex disk is also provided with the reverse osmosis seawater return port communicating with the peripheral flow channel and the pressure-compensated seawater output port communicating with the central channel through the corresponding flow distribution channel.

4. The high-pressure pump for seawater desalination according to claim 1, characterized in that, in the multi-stage energy recovery vortex disk structure, a central flow channel communicating with the center of the corresponding closed volume and a peripheral flow channel communicating with the periphery of the closed volume are provided on each static vortex disk. A high-pressure fluid inlet is provided on the static vortex disk of the previous-stage energy recovery vortex disk structure of each adjacent two-stage energy recovery vortex disk structure. The high-pressure fluid inlet on the static vortex disk of the first-stage vortex disk structure of the multi-stage energy recovery vortex disk structure constitutes the reverse osmosis docking port. The peripheral flow channel on the static vortex disk of the last-stage energy recovery vortex disk structure is communicated with the recovered seawater discharge port; a pre-stage flow distribution channel and a post-stage flow distribution channel are provided on the flow distribution disk. The pre-stage flow distribution channels are respectively communicated with the high-pressure fluid inlet and the central flow channel in the previous-stage energy recovery vortex disk structure of the adjacent two-stage energy recovery vortex disk structure. The post-stage flow distribution channels are respectively communicated with the peripheral flow channel in the previous-stage energy recovery vortex disk structure and the central flow channel of the next adjacent two-stage energy recovery vortex disk structure; a conveying flow channel is provided on the cross ring seat. One end of the conveying flow channel is communicated with the peripheral flow channel of the next-stage energy recovery vortex disk structure, and the other end is communicated with the high-pressure fluid inlet of the previous-stage energy recovery vortex disk structure of the next adjacent two-stage energy recovery vortex disk structure.

5. The high-pressure pump for seawater desalination according to claim 1, characterized in that, a filtering device is provided at the raw seawater inlet.

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