Pressure exchange apparatus

Abstract

The present application belongs to pressure exchange apparatuses. Disclosed is a magnetically driven rotor-type pressure exchange apparatus capable of self-correcting levitation. The apparatus is internally provided with a drive assembly and two levitation correction assemblies. The drive assembly comprises a plurality of energized coils, which are used for being supplied with an alternating current to generate a periodically varying magnetic field, so as to interact with permanent magnets of a rotor assembly to drive the rotor assembly to rotate. Each levitation correction assembly comprises a plurality of figure-eight coils, wherein when the rotor assembly deviates from a preset position, the magnetic flux of the figure-eight coils in a magnetic field of the permanent magnets changes to generate an induced magnetic field, and the induced magnetic field interacts with the permanent magnets, such that the rotor assembly returns to the preset position and maintains a levitated equilibrium state.

Description

Pressure exchange device

[0001] This patent application claims priority to Chinese Patent Application No. CN 202411572409.0, filed on November 6, 2024. The disclosure of the earlier application is incorporated herein by reference in its entirety. Technical Field

[0002] This application belongs to the technical field of pressure exchange devices, specifically, it relates to a rotor-type pressure exchange device. Background Technology

[0003] Reverse osmosis (RO) seawater desalination technology, as a mature freshwater production technology, has been widely used in seawater desalination plants both domestically and internationally. The operating pressure (inlet pressure before the membrane) of a RO seawater desalination system can reach 5.5 MPa-8.0 MPa. The pressure of the concentrated brine after passing through the RO membrane is only about 0.2 MPa lower than the inlet pressure. Directly discharging through a pressure reducing valve would result in significant energy waste. Pressure exchange devices can effectively recover the pressure energy from the high-pressure concentrated brine, thereby significantly reducing the operating energy consumption of the RO seawater desalination system.

[0004] Existing pressure exchange devices can be divided into two types: valve-controlled and rotor-controlled. Valve-controlled pressure exchange devices have a large footprint and require more components; while rotor-controlled pressure exchange devices have been widely used due to their advantages of simple equipment, small footprint, and high energy recovery efficiency.

[0005] The core components of a rotor-type pressure exchanger mainly consist of a rotor, end caps, and a rotor sleeve. The rotation of the rotor enables the cyclical and orderly switching between pressurization and depressurization strokes within the device. During rotor rotation, the frictional resistance between the rotor sleeve and the rotor is significant, resulting in energy loss and increasing system energy consumption. Existing technologies primarily employ two types of rotor rotation: hydraulic drive and electric motor drive. The former requires complex hydraulic structures on the end caps, while the latter necessitates complex central shaft positioning and sealing measures, increasing the structural complexity and manufacturing cost of the equipment. Summary of the Invention

[0006] This application aims to solve the related technical problems of rotor-type pressure exchange devices and provides a magnetically driven, suspended self-correcting rotor-type pressure exchange device. By driving the rotor to rotate with magnetic force, the hydraulic configuration of the end cap is simplified. It can not only flexibly adjust the flow rate, but also achieve stable rotation of the rotor without a central shaft or sleeve positioning, and has lower rotational resistance. At the same time, it can achieve eccentric self-correction during rotation to ensure the stability of its operation.

[0007] To achieve the aforementioned objectives, this application provides a pressure exchange device having the features of claim 1, and a magnetically driven, levitation self-correcting rotor-type pressure exchange device having the features of claim 11. The dependent claims provide further improvements.

[0008] The magnetically driven, levitation self-correcting rotor-type pressure exchange device provided in this application includes an internal housing, with a top housing and a bottom housing respectively installed at the top and bottom of the internal housing; the top housing is provided with a high-pressure brine inlet and a low-pressure brine outlet, and the bottom housing is provided with a low-pressure seawater inlet and a high-pressure seawater outlet;

[0009] The outer rotating surface of the inner shell is provided with a first suspension correction group, a drive group, and a second suspension correction group. The first suspension correction group, the drive group, and the second suspension correction group are protected by the outer shell. The drive group is located at the axial middle position of the inner shell and is used to interact with the permanent magnet to drive the rotor group to rotate. One first suspension correction group and one second suspension correction group have the same structure and are symmetrically arranged, located above and below the drive group, respectively, and are used to interact with the permanent magnet to keep the rotor group in a suspended and balanced state.

[0010] The drive assembly includes three third protrusions evenly spaced along the circumference of the inner housing, with no fewer than four third protrusions. Each third protrusion is wound with an energized coil, with one end of the coil facing upwards and the other end facing downwards. The two coil ends of each energized coil are connected to positive and negative poles, respectively. The upward or downward ends of two adjacent energized coils are also connected to positive and negative poles, respectively. The positive and negative poles are switched via an external frequency converter.

[0011] The first suspension correction group includes a first boss and a second boss that are spaced apart along the axial direction of the inner shell and are arranged vertically and correspondingly. The first boss and the second boss are distributed circumferentially in the inner shell and correspond one-to-one with the third boss. A first figure-eight coil is wound around the outside of the first boss and the outside of the second boss in each group. The two first figure-eight coils on opposite sides of the circumference are connected by a first connection line of two figure-eight coils.

[0012] The second suspension correction group includes a fourth protrusion and a fifth protrusion that are spaced apart along the axial direction of the inner shell and are arranged vertically and correspondingly. The fourth protrusion and the fifth protrusion are distributed circumferentially in the inner shell in a one-to-one correspondence with the third protrusion. A second figure-eight coil is wound around the outer side of each group of vertically and corresponding fourth protrusions and the outer side of the fifth protrusion. The two second figure-eight coils on opposite sides of the circumference are connected by two second figure-eight coil connecting wires.

[0013] The inner housing contains a rotor assembly, which includes a rotor body. A permanent magnet encapsulation channel is provided between the rotor body's rotor channel and its outer rotating surface. The permanent magnet encapsulation channel extends axially along the rotor body and is evenly spaced circumferentially. Permanent magnets are embedded within the permanent magnet encapsulation channel. The upper and lower ends of each permanent magnet are encapsulated by a first encapsulation block and a second encapsulation block, respectively. The first and second encapsulation blocks are respectively embedded at both ends of each permanent magnet encapsulation channel to form a seal. The number of permanent magnets is the same as the number of energized coils, the first figure-eight coil, and the second figure-eight coil. The two south poles or two north poles of adjacent permanent magnets face towards and away from the central axis of the rotor body, respectively. End caps are installed between the rotor assembly and the top housing, and between the rotor assembly and the bottom housing. Beneficial effects

[0014] The beneficial effects of this application are:

[0015] (i) The magnetically driven, levitation self-correcting rotor pressure exchange device of this application drives the rotor group to rotate by embedding permanent magnets in the rotor group and installing energized coils on the inner shell. The rotor group is driven to rotate by the interaction force of the magnetic fields generated by the two. The power that causes the rotor group to rotate can be adjusted by changing the magnetization of the permanent magnets and the switching frequency of the current of the energized coils. In this way, the rotation speed and flow rate of the rotor group are not related, and the rotation speed and flow rate can be adjusted flexibly and independently. At the same time, the new magnetic drive method eliminates the need to consider the hydraulic drive problem. The end cover design does not need to consider the hydraulic structure of the axial spiral gradient, and a simple configuration that maintains the axial uniform cross section can be achieved, which is convenient for manufacturing.

[0016] (ii) The magnetically driven, levitation self-correcting rotor pressure exchange device of this application has a drive group arranged in the circumferential direction of the inner shell, and a levitation correction group is evenly arranged above and below the drive group. Under the influence of the magnetic field of the permanent magnet in the rotor group, the figure-eight coil of the levitation correction group can generate an induced electromotive force when the rotor is not in a levitation equilibrium state, and adjust the rotor group to a levitation equilibrium state. At this time, the induced electromotive force in the figure-eight coil disappears, so that the rotor group can still maintain a levitation equilibrium state when there is no central positioning shaft, eliminating the large frictional resistance caused by the central positioning shaft and reducing the overall energy consumption of the device.

[0017] (III) The magnetically driven, levitation self-correcting rotor pressure exchange device of this application connects the figure-eight coils in the 180° circumferential direction in the levitation correction group in pairs. Under the influence of the magnetic field of the permanent magnet in the rotor group, the two connected figure-eight coils generate an induced electromotive force when the rotor is deviated in the radial direction, which adjusts the rotor group to a levitation equilibrium state. At this time, the induced electromotive force in the two connected figure-eight coils disappears, realizing the self-correction of the rotor group in the levitation process without the need for other external correction equipment, ensuring the coaxiality during rotation, reducing the vibration caused by unbalanced rotation of the rotor, extending the service life of the equipment, and making the device structure more compact and the operation process more stable. Attached Figure Description

[0018] Figure 1 is a front view of the rotor-type pressure exchange device provided in the embodiment of this application; wherein, in order to see the internal structure, the outer casing has been removed; the dashed line represents the rotation axis R of the rotor assembly;

[0019] Figure 2 is an enlarged view of part A in Figure 1;

[0020] Figure 3 is a perspective view of the rotor-type pressure exchange device provided in the embodiment of this application;

[0021] Figure 4 is a longitudinal sectional view of the rotor-type pressure exchange device provided in the embodiment of this application; wherein the cutting plane passes through the rotation axis R;

[0022] Figure 5 shows the top shell in Figure 4;

[0023] Figure 6 shows the bottom shell in Figure 4;

[0024] Figure 7 is an enlarged view of part B in Figure 4;

[0025] Figure 8 is an enlarged view of part C in Figure 4;

[0026] Figure 9 is a transverse sectional view of the rotor body in the rotor-type pressure exchange device provided in the embodiment of this application; wherein, the cutting plane is perpendicular to the rotation axis R;

[0027] Figure 10 is a diagram showing the relative relationship between the permanent magnet and the energized coil in the rotor-type pressure exchange device provided in the embodiment of this application.

[0028] Figure 11 is a perspective view of the end cover of the rotor-type pressure exchange device provided in the embodiment of this application;

[0029] Figure 12 is a perspective view of the top housing of the rotor-type pressure exchange device provided in the embodiment of this application;

[0030] Figure 13 shows the driving force generated by the energized coil on the rotor assembly at the first moment;

[0031] Figure 14 shows the driving force generated by the energized coil on the rotor assembly at the second moment;

[0032] Figure 15 shows the magnetic field lines of the permanent magnet passing through the figure-eight coil when the rotor assembly is in a suspended equilibrium state.

[0033] Figure 16 shows the attractive force of the first figure-eight coil on the permanent magnet when the rotor assembly is offset axially downward;

[0034] Figure 17 shows the attractive force of the second figure-eight coil on the permanent magnet when the rotor assembly is offset axially upward;

[0035] Figure 18 shows the force exerted by the first figure-eight coil on the permanent magnet when the rotor assembly is radially offset.

[0036] In the above diagram: 1. High-pressure brine inlet; 2. Low-pressure brine outlet; 3. Top shell; 301. First positioning hole, 302. First bolt hole, 303. Second positioning hole; 4. First suspension correction group; 401. First boss, 402. First figure-eight coil, 403. First connection of figure-eight coil, 404. Second boss; 5. Drive group; 501. First connection of energized coil, 502. Second connection of energized coil, 503. Third boss, 504. Energized coil, 505. Third connection of energized coil, 506. Fourth connection of energized coil; 6. Second suspension correction group; 601. Fourth boss, 602. Second figure-eight coil, 603. Second connection of figure-eight coil, 604. Fifth boss; 7. Inner shell; 8. Bottom shell; 801. Third positioning hole, 802. Second bolt hole; 9. 10. Low-pressure seawater inlet; 11. High-pressure seawater outlet; 12. Rotor assembly; 1101. First encapsulation block; 1102. Permanent magnet; 1103. Rotor body; 1104. Second encapsulation block; 1105. Rotor channel; 1106. Permanent magnet encapsulation channel; 1107. Hollow channel; 12. End cap; 1201. Low-pressure channel; 1202. High-pressure channel; 1203. High-pressure sealing groove; 1204. Circumferential sealing ring; 1205. Fourth positioning hole; 1206. Low-pressure sealing groove; 13. Outer housing; 1301. First positioning pin; 1302. Second positioning pin. Embodiments of the present invention

[0037] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0038] It should be noted that in this application, terms such as "top," "bottom," "upper," "lower," "left," "right," "front," and "rear," which indicate direction and position, are used for the convenience of description and are based on the posture of the pressure exchange device and its components shown in the accompanying drawings. It is easy to understand that the pressure exchange device provided in this application may also have other postures, and the aforementioned terms indicating direction and position should not unreasonably limit the scope of protection of this application.

[0039] Based on the basic rotor-type pressure exchange device structure, this application adds a drive group 5 and a permanent magnet 1102 to realize the magnetic drive function; removes the central positioning shaft and adds a first suspension correction group 4 and a second suspension correction group 6 to realize the rotor's suspension and self-correction function.

[0040] As shown in Figures 1-6, the magnetically driven, levitation self-correcting rotor-type pressure exchange device of this application mainly consists of a top shell 3, a first levitation correction group 4, a drive group 5, a second levitation correction group 6, an inner shell 7, a bottom shell 8, a rotor group 11, an end cover 12, and an outer shell 13.

[0041] Both the inner shell 7 and the outer shell 13 are cylindrical structures, made of non-magnetic alloy material. The outer shell 13 is fitted over the inner shell 7. A top shell 3 and a bottom shell 8 are respectively installed on the top and bottom of the inner shell 7 and the outer shell 13. Both the top shell 3 and the bottom shell 8 are made of non-magnetic alloy material. The top shell 3 has multiple (preferably an even number) annularly distributed first bolt holes 302, which are axially penetrating for bolt installation. A bolt blind hole is provided on the top end face of the inner shell 7 to fix the top shell 3 to the inner shell 7. All bolts used are made of non-magnetic material. The bottom shell 8 has multiple (preferably an even number) annularly distributed second bolt holes 802, which are axially penetrating for bolt installation. A bolt blind hole is provided on the bottom end face of the inner shell 7 to fix the bottom shell 8 to the inner shell 7. All bolts used are made of non-magnetic material. The bottom surface of the top housing 3 is provided with several first positioning holes 301, and the top surface of the bottom housing 8 is provided with several third positioning holes 801. Both the first positioning holes 301 and the third positioning holes 801 are axially aligned and do not penetrate each other. The number of each type of positioning hole should be no less than two, preferably three to four, and they should be evenly distributed in a ring. The top and bottom of the outer housing 13 are respectively provided with first positioning pins 1301 and second positioning pins 1302, which are paired with the first positioning holes 301 and the third positioning holes 801 to achieve positioning of the outer housing 13 relative to the top housing 3 and the bottom housing 8, preventing circumferential rotation and radial movement of the outer housing 13. The high-pressure brine inlet 1 and the low-pressure brine outlet 2 are fixed to the top housing 3 by welding, and their outer connecting pipes can be connected using a pipe joint or flange. The low-pressure seawater inlet 9 and the high-pressure seawater outlet 10 are fixed to the bottom housing 8 by welding, and their outer connecting pipes can be connected using a pipe joint or flange.

[0042] The first suspension correction group 4, the drive group 5, and the second suspension correction group 6 are coupled to the outer rotating surface of the inner shell 7, and the outer shell 13 covers the first suspension correction group 4, the drive group 5, and the second suspension correction group 6.

[0043] The drive group 5 interacts with the permanent magnet 1102 within the rotor group 11 to drive the internal rotor group 11 to rotate. The drive group 5 includes a first energized coil connection 501, a second energized coil connection 502, a third boss 503, an energized coil 504, a third energized coil connection 505, and a fourth energized coil connection 506. The third boss 503 is made of a magnetically conductive material (e.g., silicon steel sheet), located on the outer rotating surface at the axial center of the inner housing 7, and evenly spaced along the circumference of the inner housing 7. The number of third bosses 503 should be no less than four, and can be increased to an even number. The third boss 503 protrudes outward relative to the inner housing 7 so that the energized coil 504 can be wound around it. Its cross-section can be rectangular, circular, elliptical, or any shape that allows the energized coil to be wound; in this embodiment, a rectangle is used. The third boss 503 can be welded to the inner housing 7 or integrally formed with the inner housing 7. Each third protrusion 503 is externally wound with an energized coil 504 (made of a second wire). After winding, each energized coil 504 has one end (first end) facing upwards and the other end (second end) facing downwards. The number of turns of the energized coil 504 can be flexibly adjusted according to the weight of the rotor assembly 11 and the required rotational speed range of the rotor assembly 11. The two coil ends of each energized coil 504 are connected to the positive and negative poles respectively. The two upward-facing ends or the two downward-facing ends of two adjacent energized coils 504 are connected to the positive and negative poles respectively, thus forming an alternating pattern of positive and negative ends on the top, bottom, left, and right sides of the energized coil 504 (the above distinction between positive and negative poles is only for differentiation; the actual positive and negative poles are adjusted externally).

[0044] Specifically, the two coil interfaces of the same energized coil 504 are connected to the first energized coil connection 501 and the fourth energized coil connection 506, respectively, or to the second energized coil connection 502 and the third energized coil connection 505, respectively. Simultaneously, the two upward-facing interfaces of two adjacent energized coils 504 are connected to the first energized coil connection 501 and the second energized coil connection 502, respectively, and the two downward-facing interfaces of two adjacent energized coils 504 are connected to the third energized coil connection 505 and the fourth energized coil connection 506, respectively. The first energized coil connection 501 and the third energized coil connection 505 are used to connect to the same interface of an external frequency converter (it's easy to understand that the frequency converter can also be replaced by other external power supplies capable of providing periodically changing current), while the second energized coil connection 502 and the fourth energized coil connection 506 are used to connect to another interface of the external frequency converter; the two different interfaces of the external frequency converter are used alternately as positive and negative terminals. The energized coil 504, along with the first connecting wire 501, the second connecting wire 502, the third connecting wire 505, and the fourth connecting wire 506, are all wrapped with insulating material to ensure that no current flows through the coils in contact with each other. The energized coil 504 can be fixed to the first connecting wire 501, the second connecting wire 502, the third connecting wire 505, and the fourth connecting wire 506 by welding.

[0045] In this application, the energized coil 504 can be supplied with single-phase alternating current to generate a periodically changing current in the coil. It is readily understood that by changing the connection method between the energized coil 504 and the external power source, three-phase alternating current can also be used to power the energized coil 504. The scheme of using three-phase power supply does not depart from the inventive concept of this application and is also within the scope of protection of this application.

[0046] A rotor-type pressure exchange device has exactly two suspension correction groups, referred to as the first suspension correction group 4 and the second suspension correction group 6. The first suspension correction group 4 and the second suspension correction group 6 have the same structure and are symmetrically arranged, located above and below the drive group 5 respectively. They interact with the permanent magnet 1102 in the rotor group 11 to keep the rotor group 11 in a suspended equilibrium state, and realize the suspension self-correction function during operation.

[0047] The first suspension correction group 4 is located in the upper half of the inner shell 7 (above the drive group 5), and includes a first boss 401, a first figure-eight coil 402, a first connecting wire of the figure-eight coil 403, and a second boss 404. The first boss 401 and the second boss 404 have the same structure and are both made of magnetically conductive material (such as silicon steel sheets). They are spaced apart along the axial direction of the inner shell 7 and are arranged vertically and vertically to form a first boss pair; wherein the first boss 401 is on top and the second boss 404 is on the bottom. The number of first bosses 401 and second bosses 404 is the same, and they are evenly distributed along the circumference of the inner shell 7, and their circumferential distribution in the inner shell 7 completely corresponds to the third boss 503. The first protrusion 401 and the second protrusion 404 protrude outward relative to the inner housing 7 so that the first figure-eight coil 402 can be wound around them (the first figure-eight coil is formed by winding the first wire). The cross-sectional shape can be any shape that allows the first figure-eight coil 402 to be wound, such as rectangular, circular, or elliptical. In this embodiment, a rectangle is used. The first protrusion 401 and the second protrusion 404 can be welded to the inner housing 7 or integrally formed with the inner housing 7. A first figure-eight coil 402 is wound in a twisted figure-eight shape around the outer sides of the corresponding upper and lower first protrusions 401 and second protrusions 404. The number of first figure-eight coils 402 is also the same as the number of first protrusions 401 and second protrusions 404. The two interfaces of the two first figure-eight coils 402 located on opposite sides of the circumference (i.e., at a 180° angle) are connected by two first figure-eight coil connecting wires 403. The first figure-eight coils 402 and the first figure-eight coil connecting wires 403 are both wrapped with insulating material to ensure that no current flows through the coils that are in contact with each other. The first figure-eight coils 402 and the first figure-eight coil connecting wires 403 are fixed together by welding.

[0048] The second suspension correction group 6 is located in the lower half of the inner shell 7 (below the drive group 5), and includes a fourth boss 601, a second figure-eight coil 602, a second connecting wire of the figure-eight coil 603, and a fifth boss 604. The fourth boss 601 and the fifth boss 604 have the same structure and are both made of magnetically conductive material (such as silicon steel sheets). They are spaced apart axially in the inner shell 7 and are arranged vertically to form a second boss pair; the fourth boss 601 is on top and the fifth boss 604 is on the bottom. The fourth boss 601 and the fifth boss 604 are the same number and are evenly distributed along the circumference of the inner shell 7, and their circumferential distribution in the inner shell 7 completely corresponds to the third boss 503. The fourth protrusion 601 and the fifth protrusion 604 protrude outward relative to the inner housing 7 so that the second figure-eight coil 602 can be wound around them (the second figure-eight coil is formed by winding the third wire). Their cross-sectional shape can be rectangular, circular, elliptical, or any shape that allows the second figure-eight coil 602 to be wound; in this embodiment, a rectangle is used. The fourth protrusion 601 and the fifth protrusion 604 can be welded to the inner housing 7 or integrally formed with it. One second figure-eight coil 602 is wound in a twisted figure-eight shape around the corresponding upper and lower fourth protrusions 601 and fifth protrusions 604. The number of second figure-eight coils 602 is the same as the number of fourth protrusions 601 and fifth protrusions 604. The two interfaces of the two second figure-eight coils 602 located on opposite sides of the circumference (i.e., at a 180° angle) are connected by two second figure-eight coil wires 603. Both the second figure-eight coils 602 and the second figure-eight coil wires 603 are wrapped with insulating material to ensure that no current flows through the coils in contact with each other. The second figure-eight coils 602 and the second figure-eight coil wires 603 are fixed together by welding.

[0049] Referring to Figures 7-10, the rotor assembly 11 is located inside the inner housing 7 and includes a first encapsulation block 1101, a permanent magnet 1102, a rotor body 1103, and a second encapsulation block 1104. The rotor body 1103 is made of a wear-resistant, non-magnetic material and, in addition to the rotor channel 1105, also has multiple permanent magnet encapsulation channels 1106. The permanent magnet encapsulation channels 1106 extend axially along the rotor body 1103 and are evenly spaced circumferentially. The permanent magnet encapsulation channels 1106 are located between the rotor channel 1105 and the outer rotating surface of the rotor body 1103. The permanent magnet 1102 is embedded in the permanent magnet encapsulation channel 1106. The upper and lower ends of the permanent magnet 1102 are encapsulated by the first encapsulation block 1101 and the second encapsulation block 1104, respectively, to prevent water from contacting the permanent magnet 1102 and to seal the permanent magnet 1102. The first encapsulation block 1101 and the second encapsulation block 1104 are sealing materials with good elasticity and wear resistance. They are respectively embedded and installed at both ends of each permanent magnet encapsulation channel 1106. The outer surfaces of the first encapsulation block 1101 and the second encapsulation block 1104 are flush with the upper and lower ends of the rotor body 1103. The first encapsulation block 1101 and the second encapsulation block 1104 can be fixed by applying adhesive to their surfaces in contact with the permanent magnets 1102. The arrangement of each permanent magnet 1102 should ensure that the north and south poles of adjacent permanent magnets 1102 are in opposite directions, that is, the two south poles or two north poles of adjacent permanent magnets 1102 face towards the central axis of the rotor body 1103 and away from the central axis of the rotor body 1103, respectively. The amount of magnetization of the permanent magnet 1102 depends on the gravity of the rotor assembly 11 and the required rotational speed range of the rotor assembly 11. The number of permanent magnets 1102 is the same as that of the third boss 503, the energized coil 504, the first boss 401, the second boss 404, the first figure-eight coil 402, the fourth boss 601, the fifth boss 604, and the second figure-eight coil 602. The top of the first figure-eight coil 402 and the bottom of the second figure-eight coil 602 are flush with the upper and lower end faces of the permanent magnet 1102, respectively.

[0050] Preferably, the rotor body 1103 has a hollow channel 1107 along its central axis. The hollow channel 1107 is used to reduce the weight of the rotor body 1103 and reduce the magnetic force required to drive the rotor assembly 11 to rotate. During normal operation, fluid flows through the rotating rotor channel 1105. Due to the magnetic force, the rotor assembly 11 rotates in a suspended equilibrium state at the center position of the inner shell 7 during normal operation. The suspended equilibrium state refers to a dynamic stable state in which the thickness of the liquid film on the end face gap between the upper and lower end faces of the rotor assembly 11 and the end face of the end cover 12 is basically equal, and the thickness of the circumferential liquid film between the outer circumference of the rotor assembly 11 and the inner circumference of the inner shell 7 is basically equal (i.e., the rotor assembly 11 and the inner shell 7 are basically coaxial). In this application, the term "preset position" refers to the position of the rotor assembly 11 in the suspended equilibrium state.

[0051] As shown in Figure 4, end caps 12 are installed between the rotor assembly 11 and the top housing 3, and between the rotor assembly 11 and the bottom housing 8, respectively. The two end caps 12 have the same structure and are symmetrically arranged. They are both made of wear-resistant non-magnetic material.

[0052] As shown in Figure 11, the end cap 12 is provided with an axially penetrating low-pressure channel 1201 and a high-pressure channel 1202, used for the flow of low-pressure brine, low-pressure seawater, and high-pressure brine, high-pressure seawater, respectively. The end face of the end cap 12 relative to the bottom housing 8 or the top housing 3 is provided with a high-pressure sealing groove 1203 and a low-pressure sealing groove 1206. Sealing rings are installed in both the high-pressure sealing groove 1203 and the low-pressure sealing groove 1206 to form a high-pressure sealing area and a low-pressure sealing area, respectively. The high-pressure sealing groove 1203 is generally located around the high-pressure channel 1202, and its outline is usually annular. The low-pressure sealing groove 1206 is generally located near the outer edge of the end cap 12, and its outline is usually annular. Furthermore, the outer side of the low-pressure sealing groove 1206 should not be too close to the outer circumference of the end cap 12 to ensure the strength of the seal. A circumferential sealing ring 1204 is provided on the outer rotating surface of the end cap 12 to prevent leakage of high-pressure fluid from the circumferential liquid film of the rotor assembly 11.

[0053] High-pressure brine flowing in through high-pressure brine inlet 1 flows through high-pressure channel 1202 of end cover 12 and enters rotor channel 1105 for pressure exchange. Low-pressure brine that has completed pressure exchange inside rotor channel 1105 flows through low-pressure channel 1201 of end cover 12 and exits through low-pressure brine outlet 2. Unlike hydraulically driven rotor-type pressure exchange devices that require an axially spirally tapered hydraulic structure to achieve rotor rotation by utilizing the tangential component force of the fluid inflow, where the rotational speed is highly correlated with the fluid flow rate and spiral angle, this application relies on magnetic drive. Therefore, the low-pressure channel 1201 and high-pressure channel 1202 of end cover 12 do not require a complex hydraulic structure and can maintain an axially uniform cross-section through structure.

[0054] As shown in Figure 12, in addition to the first positioning hole 301 and the first bolt hole 302, the top housing 3 has a second positioning hole 303 on its surface relative to the end cover 12. The second positioning hole 303 and the fourth positioning hole 1205 on the opposite surface of the end cover 12 are paired and fitted with a pin to achieve the positioning of the end cover 12. The second positioning hole 303 and the fourth positioning hole 1205 are both blind holes, the same in number (generally no less than 2), and evenly distributed in a ring. The positioning method of the bottom housing 8 and the end cover 12 is the same as that of the top housing 3 and the end cover 12, and will not be described again here.

[0055] The magnetically driven, levitation self-correcting rotor-type pressure exchange device of this application operates as follows:

[0056] The pressure exchange device operates through a pressurization process and a depressurization process. The pressurization process involves high-pressure brine flowing in from the high-pressure brine inlet 1, passing through the high-pressure channel 1202 into the rotor channel 1105, pressurizing the low-pressure seawater pre-filled inside the rotor channel 1105. The pressurized high-pressure seawater is then discharged sequentially from the rotor channel 1105, the high-pressure channel 1202, and the high-pressure seawater outlet 10. The depressurization process involves low-pressure seawater flowing in from the low-pressure seawater inlet 9, passing through the low-pressure channel 1201 into the rotor channel 1105, depressurizing the high-pressure brine inside the rotor channel 1105. The depressurized low-pressure brine is then discharged sequentially from the rotor channel 1105, the low-pressure channel 1201, and the low-pressure brine outlet 2.

[0057] The rotor driving process is as follows: The energized coil 504 in the drive group 5 is connected to an external frequency converter through the first connection 501, the second connection 502, the third connection 505, and the fourth connection 506 of the energized coil. The external frequency converter changes the direction of current flow in the energized coil 504 by switching its positive and negative poles, thereby changing the direction of the magnetic field generated by the energized coil 504. The direction of the magnetic field generated by the energized coil 504 is the same as or opposite to the direction of the magnetic field of the permanent magnet 1102 encapsulated inside the rotor group 11, causing the rotor group 11 to be subjected to attractive and repulsive forces and thus rotate. During the movement of the rotor group 11, both of these forces are driving forces. The magnitude of the driving force depends on the magnetization of the permanent magnet 1102, the magnitude of the current in the energized coil 504, and the frequency of the current direction change.

[0058] The rotor driving process, as shown in Figures 13 and 14, is further described below. Figure 13 illustrates the interaction forces between three permanent magnets ac out of all ten permanent magnets 1102 and three energized coils I-III out of all ten energized coils 504 at the first moment. In Figure 13, the rotor assembly 11 rotates in the direction indicated by arrow T, with each permanent magnet 1102 circumferentially positioned between two adjacent energized coils 504. Based on the magnetic poles of the magnetic field (first magnetic field) generated by each energized coil 504 at the current moment, as shown in Figure 13, the N pole of energized coil I generates an attractive force F1 on the S pole of permanent magnet a and a repulsive force F2 on the N pole of permanent magnet b; the S pole of energized coil II generates an attractive force F3 on the N pole of permanent magnet b and a repulsive force F4 on the S pole of permanent magnet c; and the N pole of energized coil III generates an attractive force F5 on the S pole of permanent magnet c. Whether it is attraction or repulsion, the forces F1-F5 are all driving forces for the rotor assembly 11 to rotate in the direction shown by arrow T, and can all drive the rotor assembly 11 to rotate in the direction shown by arrow T.

[0059] After the first moment, when the permanent magnet 1102 aligns radially with the energized coils 504 one by one, the direction of the current in all the energized coils 504 changes and the direction of the magnetic poles of the first magnetic field changes.

[0060] Figure 14 illustrates the interaction forces between permanent magnet ac and energized coils I-III at the second moment after the magnetic pole direction of the first magnetic field generated by energized coil 504 changes. Based on the magnetic poles of the first magnetic field generated by each energized coil 504 at the current moment, as shown in Figure 14, the S pole of energized coil I generates a repulsive force F6 on the S pole of permanent magnet a; the N pole of energized coil II generates an attractive force F7 on the S pole of permanent magnet a and a repulsive force F8 on the N pole of permanent magnet b; the S pole of energized coil III generates an attractive force F9 on the N pole of permanent magnet b and a repulsive force F10 on the S pole of permanent magnet c. Whether attractive or repulsive, forces F6-F10 are all driving forces for the rotation of rotor assembly 11 in the direction indicated by arrow T, and can all drive rotor assembly 11 to rotate in the direction indicated by arrow T.

[0061] In Figures 13 and 14, for clarity, only the interaction between 3 of the 10 energized coils 504 and 10 permanent magnets 1102 is shown. The interaction between the other energized coils 504 and permanent magnets 1102 is the same.

[0062] During the startup of the pressure exchange device, the rotational speed of rotor assembly 11 increases from 0 to its operating speed. This process requires a relatively large current, and the rotational speed of rotor assembly 11 is constantly changing. To match the frequency of the current direction change in energized coil 504 with the rotational speed of rotor assembly 11 during startup, a sensor can be installed to monitor the rotational speed of rotor assembly 11 in real time. This allows for real-time adjustment of the current direction change frequency based on the rotational speed of rotor assembly 11, ensuring a smooth startup of the pressure exchange device. After startup, frequency adjustment is not required during subsequent steady-state operation.

[0063] The rotor suspension correction process is as follows: When the rotor assembly 11 is in a suspension equilibrium state, the magnetic field generated by the permanent magnet 1102 encapsulated inside the rotor assembly 11 causes the induced electromotive force generated by the first figure-eight coil 402 in the first suspension correction assembly 4 and the second figure-eight coil 602 in the second suspension correction assembly 6 to be 0. At this time, no current flows through the first figure-eight coil 402 and the second figure-eight coil 602, and the rotor assembly 11 maintains its suspension equilibrium state. When the rotor assembly 11 shifts downward, the magnetic flux through the upper and lower loops of the figure-eight shape of the first figure-eight coil 402 is different, with the magnetic flux through the upper loop being smaller. This results in a smaller induced electromotive force (EMF) in the upper loop compared to the lower loop, generating an induced current inside the first figure-eight coil 402. The magnetic field generated by this induced current interacts with the magnetic field generated by the permanent magnet 1102, causing the rotor assembly 11 to return to a suspended equilibrium state. When the rotor assembly 11 shifts upward, the magnetic flux through the upper and lower loops of the figure-eight shape of the second figure-eight coil 602 is different, with the magnetic flux through the lower loop being smaller. This results in a smaller induced EMF in the lower loop compared to the upper loop, generating an induced current inside the second figure-eight coil 602. The magnetic field generated by this induced current interacts with the magnetic field generated by the permanent magnet 1102, causing the rotor assembly 11 to return to a suspended equilibrium state. Since the figure-eight coils on the opposite side are in a connected state, when the rotor assembly 11 shifts left and right, the two opposite figure-eight coils parallel to the direction of shift will also generate an induced electromotive force due to the movement of the magnetic field of the rotor assembly 11, and then generate an induced current in the two opposite figure-eight coils. The magnetic field generated by this will also cause the rotor assembly 11 to return to the suspended equilibrium state.

[0064] The rotor suspension correction process is further described below.

[0065] When the rotor assembly 11 is in a suspended equilibrium state, the upper end face of the first figure-eight coil 402 is flush with the upper end face of the permanent magnet 1102, and the lower end face of the second figure-eight coil is flush with the lower end face of the permanent magnet 1102. As shown in Figure 15, for each figure-eight coil (i.e., each first figure-eight coil 402 and each second figure-eight coil 602), the upper circle m and the lower circle n are both radially covered by the magnetic field B generated by the permanent magnet 1102. Simultaneously, the radial distance between each figure-eight coil and the permanent magnet 1102 is the same. At this time, the induced electromotive force generated in the upper circle m and the lower circle n of each figure-eight coil is equal in magnitude and opposite in direction, and there is no induced current in the figure-eight coil.

[0066] When the rotor assembly 11 shifts downwards along the axial direction, as shown in Figure 16, a portion of the upper circle 402m of the first figure-eight coil (near the top) is no longer covered by the magnetic field of the permanent magnet 1102. The lower circle 402n of the first figure-eight coil and the upper and lower circles of the second figure-eight coil 602 are still covered by the magnetic field B of the permanent magnet 1102. The magnetic flux through the upper circle 402m of the first figure-eight coil decreases, and an induced current is generated. According to Lenz's law, the magnetic field B1 (the second magnetic field) generated by the induced current always opposes the change in magnetic flux, that is, it compensates for the decrease in magnetic field B. The direction of magnetic field B1 is shown in Figure 16. At this time, the S pole of magnetic field B1 attracts the N pole of the permanent magnet 1102, and the upper circle 402m of the first figure-eight coil exerts an attractive force F11 on the rotor assembly 11, pulling the rotor assembly 11 back to its original position and maintaining a suspended equilibrium state. It should be noted that Figure 16 is illustrated with the N pole of permanent magnet 1102 facing the figure-eight coil as an example. The same principle applies when the S pole of permanent magnet 1102 faces the figure-eight coil. The figure-eight coil will also generate an attractive force to pull the rotor assembly 11 back to its original position, which will not be elaborated further.

[0067] When the rotor assembly 11 shifts upward along the axial direction, as shown in Figure 17, a portion of the lower circle 602n of the second figure-eight coil (the part near the bottom) is no longer covered by the magnetic field of the permanent magnet 1102. The upper circle 602m of the second figure-eight coil and the upper and lower circles of the first figure-eight coil 402 are still covered by the magnetic field B of the permanent magnet 1102. The magnetic flux through the lower circle 602n of the second figure-eight coil decreases, and an induced current is generated. According to Lenz's law, the magnetic field B2 (the second magnetic field) generated by the induced current always opposes the change in magnetic flux, that is, it compensates for the decrease in magnetic field B. The direction of magnetic field B2 is shown in Figure 17. At this time, the S pole of magnetic field B2 attracts the N pole of the permanent magnet 1102, and the lower circle 602n of the second figure-eight coil generates an attractive force F12 on the rotor assembly 11, pulling the rotor assembly 11 back to its original position and maintaining a suspended equilibrium state. It should be noted that Figure 17 uses the N pole of permanent magnet 1102 facing the figure-eight coil as an example for illustration. The same principle applies when the S pole of permanent magnet 1102 faces the figure-eight coil. The figure-eight coil will also generate an attractive force to pull the rotor assembly 11 back to its original position, which will not be elaborated further.

[0068] When the rotor assembly 11 undergoes radial displacement, as shown in Figure 18, the displacement towards the first figure-eight coil 402-Ⅰ will be used as an example. When the displacement shown in Figure 18 occurs, the permanent magnet 1102d approaches the first figure-eight coil 402-Ⅰ, increasing the magnetic field density and magnetic flux through it. The first figure-eight coil 402-Ⅰ and the first figure-eight coil 402-Ⅱ are connected by the first connecting line of the figure-eight coil, forming a closed loop. According to Lenz's law, a magnetic field B3 (second magnetic field) as shown in Figure 18 is generated in the first figure-eight coil 402-Ⅰ. The N pole of the magnetic field B3 repels the N pole of the permanent magnet 1102d, and the first figure-eight coil 402-Ⅰ generates a repulsive force F13 on the rotor assembly 11. Simultaneously, for the first figure-eight coil 402-II, which is opposite to the first figure-eight coil 402-Ⅰ, after the shift occurs, the permanent magnet 1102e moves away from the first figure-eight coil 402-Ⅱ, and the magnetic field density passing through the first figure-eight coil 402-Ⅱ decreases, resulting in a decrease in magnetic flux. According to Lenz's law, a magnetic field B4 (second magnetic field) is generated in the first figure-eight coil 402-Ⅱ, as shown in Figure 18. The N pole of the magnetic field B4 attracts the S pole of the permanent magnet 1102e, and the first figure-eight coil 402-Ⅱ generates an attractive force F14 on the rotor assembly 11. The attractive force F14 and the repulsive force F13 form a resultant force, causing the rotor assembly 11 to return to its original position and maintain a suspended equilibrium state. It should be noted that Figure 18 uses the first figure-eight coil as an example for illustration, but the principle of the second figure-eight coil exerting a force on the permanent magnet is the same, which will also drive the rotor assembly back to a suspended equilibrium state, and will not be elaborated further.

[0069] Although the preferred embodiments of this application have been described above in conjunction with the accompanying drawings, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many specific modifications under the guidance of this application without departing from the spirit and scope of the claims, and these modifications all fall within the scope of protection of this application.

Claims

1. A pressure exchange device, comprising an inner shell, an outer shell, a top shell, a bottom shell, and a rotor assembly, wherein the inner shell and the outer shell are both cylindrical, the inner shell is fitted inside the outer shell, the top ends of the inner shell and the outer shell are connected to the top shell, and the bottom ends of the inner shell and the outer shell are connected to the bottom shell, the top shell has a high-pressure brine inlet and a low-pressure brine outlet, the bottom shell has a low-pressure seawater inlet and a high-pressure seawater outlet, the rotor assembly includes a rotor body, the rotor body having at least two rotor channels extending axially through itself, the rotor channels being configured to alternately connect the high-pressure brine inlet and the high-pressure seawater outlet, and to connect the low-pressure brine outlet and the low-pressure seawater inlet, characterized in that, The pressure exchange device further includes: Two end caps are located inside the inner housing, respectively between the top end of the top housing and the top end of the rotor body, and between the bottom end of the bottom housing and the bottom end of the rotor body. The end caps are provided with a low-pressure channel and a high-pressure channel that penetrate through themselves along the axial direction. At least four permanent magnets are disposed on the rotor body and are distributed circumferentially along the rotor body, with the magnetic poles of two adjacent permanent magnets having opposite distributions; A drive assembly, fixedly disposed between the inner housing and the outer housing, includes at least four circumferentially spaced energized coils. These coils carry periodically changing currents to generate a periodically changing first magnetic field that interacts with the permanent magnet, driving the rotor assembly to rotate. The current directions of adjacent energized coils are opposite at the same time. The first and second suspension correction groups are fixedly disposed between the inner and outer shells and located above and below the drive group, respectively. The first suspension correction group includes an even number of first figure-eight coils distributed circumferentially, with each pair of first figure-eight coils facing each other and connected by a first figure-eight coil connecting line. The second suspension correction group includes an even number of second figure-eight coils distributed circumferentially, with each pair of second figure-eight coils facing each other and connected by a second figure-eight coil connecting line. Both the first and second figure-eight coils are used to induce a second magnetic field by utilizing the change in magnetic flux in the magnetic field of the permanent magnet when the rotor group deviates from the preset position, thereby interacting with the permanent magnet and driving the rotor group back to the preset position.

2. The pressure exchange device as described in claim 1, characterized in that, The permanent magnets are linear and parallel to the axis of the inner shell, and each permanent magnet is distributed on a first circumference centered on the axis of the inner shell.

3. The pressure exchange device as described in claim 2, characterized in that, The length directions of the first figure-eight coil and the second figure-eight coil are both parallel to the axis of the inner shell. Each first figure-eight coil is distributed on a second circumference centered on the axis of the inner shell, and each second figure-eight coil is distributed on a third circumference centered on the axis of the inner shell. The radii of the second circumference and the third circumference are equal.

4. The pressure exchange device as described in claim 2, characterized in that, The number of the energized coil, the permanent magnet, the first figure-eight coil, and the second figure-eight coil are the same and they are all evenly distributed circumferentially.

5. The pressure exchange device as described in claim 2, characterized in that, The top end of the first figure-eight coil is axially aligned with the top end of the permanent magnet, and the bottom end of the second figure-eight coil is axially aligned with the bottom end of the permanent magnet.

6. The pressure exchange device as described in claim 1, characterized in that, The rotor body is provided with a permanent magnet encapsulation channel, the permanent magnet encapsulation channel is parallel to the axis of the rotor body, and the permanent magnet is disposed in the permanent magnet encapsulation channel.

7. The pressure exchange device as described in claim 6, characterized in that, The permanent magnet encapsulation channel is located between the rotor channel and the outer wall of the rotor body.

8. The pressure exchange device as described in claim 6, characterized in that, The permanent magnet encapsulation channel runs through the rotor body, and the two ends of the permanent magnet are respectively provided with a first encapsulation block and a second encapsulation block.

9. The pressure exchange device as claimed in claim 1, characterized in that, A first energized coil wire, a second energized coil wire, a third energized coil wire, and a fourth energized coil wire are provided between the inner housing and the outer housing for connecting an external power source and an energized coil. The first and third wires of the energized coils are connected to the first pole of the external power supply, and the second and fourth wires of the energized coils are connected to the second pole of the external power supply. The first ends of two adjacent energized coils are respectively connected to the first and second wires of the energized coils, and the second ends are respectively connected to the third and fourth wires of the energized coils, so that the current directions of the two adjacent energized coils are opposite.

10. The pressure exchange device as claimed in claim 1, characterized in that, The outer wall of the inner housing is provided with a first boss pair, the first boss pair including a first boss and a second boss arranged axially spaced apart, and the first figure-eight coil is formed by a first wire wound around the first boss and the second boss. The outer wall of the inner housing is provided with a third protrusion, the same number as the number of the energized coils, and the energized coils are formed by a second wire wound around the third protrusions; The outer wall of the inner housing is provided with a second pair of bosses, the second pair of bosses including a fourth boss and a fifth boss arranged at intervals along the axial direction, and the second figure-eight coil is formed by a third wire wound around the fourth boss and the fifth boss.

11. A magnetically driven, levitation self-correcting rotor-type pressure exchange device, characterized in that, It includes an inner shell, with a top shell and a bottom shell respectively installed at the top and bottom of the inner shell; the top shell is provided with a high-pressure brine inlet and a low-pressure brine outlet, and the bottom shell is provided with a low-pressure seawater inlet and a high-pressure seawater outlet; The outer rotating surface of the inner shell is provided with a first suspension correction group, a drive group, and a second suspension correction group. The first suspension correction group, the drive group, and the second suspension correction group are protected by the outer shell. The drive group is located at the axial middle position of the inner shell and is used to interact with the permanent magnet to drive the rotor group to rotate. One first suspension correction group and one second suspension correction group have the same structure and are symmetrically arranged, located above and below the drive group, respectively, and are used to interact with the permanent magnet to keep the rotor group in a suspended and balanced state. The drive assembly includes three third protrusions evenly spaced along the circumference of the inner housing, with no fewer than four third protrusions. Each third protrusion is wound with an energized coil, with one end of the coil facing upwards and the other end facing downwards. The two coil ends of each energized coil are connected to positive and negative poles, respectively. The upward or downward ends of two adjacent energized coils are also connected to positive and negative poles, respectively. The positive and negative poles are switched via an external frequency converter. The first suspension correction group includes a first boss and a second boss that are spaced apart along the axial direction of the inner shell and are arranged vertically and correspondingly. The first boss and the second boss are distributed circumferentially in the inner shell and correspond one-to-one with the third boss. A first figure-eight coil is wound around the outside of the first boss and the outside of the second boss in each group. The two first figure-eight coils on opposite sides of the circumference are connected by a first connection line of two figure-eight coils. The second suspension correction group includes a fourth protrusion and a fifth protrusion that are spaced apart along the axial direction of the inner shell and are arranged vertically and correspondingly. The fourth protrusion and the fifth protrusion are distributed circumferentially in the inner shell in a one-to-one correspondence with the third protrusion. A second figure-eight coil is wound around the outer side of each group of vertically and corresponding fourth protrusions and the outer side of the fifth protrusion. The two second figure-eight coils on opposite sides of the circumference are connected by two second figure-eight coil connecting wires. The inner housing contains a rotor assembly, which includes a rotor body. A permanent magnet encapsulation channel is provided between the rotor body's rotor channel and its outer rotating surface. The permanent magnet encapsulation channel extends axially along the rotor body and is evenly spaced circumferentially. Permanent magnets are embedded within the permanent magnet encapsulation channel. The upper and lower ends of each permanent magnet are encapsulated by a first encapsulation block and a second encapsulation block, respectively. The first and second encapsulation blocks are respectively embedded at both ends of each permanent magnet encapsulation channel to form a seal. The number of permanent magnets is the same as the number of energized coils, the first figure-eight coil, and the second figure-eight coil. The two south poles or two north poles of adjacent permanent magnets face towards and away from the central axis of the rotor body, respectively. End caps are installed between the rotor assembly and the top housing, and between the rotor assembly and the bottom housing.

12. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 11, characterized in that, The inner shell, the top shell, the bottom shell, the rotor body, the end cover, and the outer shell are all made of non-magnetic material, while the first boss, the second boss, the third boss, the fourth boss, and the fifth boss are all made of magnetic material.

13. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 11, characterized in that, The top housing and the bottom housing are respectively fixed to the inner housing by axially arranged bolts, which are evenly distributed in a ring on the top housing and the bottom housing.

14. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 11, characterized in that, The positioning of the outer housing is achieved by the matching assembly of positioning pins and positioning holes respectively provided on the outer housing, the top housing, and the bottom housing; the fixing of the outer housing is achieved by the clamping force provided by the bolts installed on the top housing and the bottom housing.

15. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 11, characterized in that, The two coil interfaces of the same energized coil are respectively connected to the first and fourth energized coil wires, or respectively connected to the second and third energized coil wires; the two upward-facing interfaces of two adjacent energized coils are respectively connected to the first and second energized coil wires, and the two downward-facing interfaces of two adjacent energized coils are respectively connected to the third and fourth energized coil wires; the first and third energized coil wires are used to connect to the same interface of an external frequency converter, and the second and fourth energized coil wires are used to connect to another interface of an external frequency converter; the two different interfaces of the external frequency converter are used alternately as positive and negative terminals.

16. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 11, characterized in that, The rotor body has a hollow channel along its central axis.

17. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 11, characterized in that, The outer surfaces of the first and second encapsulation blocks are flush with the upper and lower ends of the rotor body.

18. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 11, characterized in that, The upper and lower end caps have identical structures and are symmetrically arranged. Each end cap has an axially penetrating low-pressure channel and a high-pressure channel. The end face of the end cap relative to the bottom shell or the top shell has a high-pressure sealing groove and a low-pressure sealing groove. Sealing rings are installed in both the high-pressure sealing groove and the low-pressure sealing groove to achieve sealing of the high-pressure fluid and the low-pressure fluid, respectively. A circumferential sealing ring is provided on the outer rotating surface of the end cap to achieve sealing of the high-pressure fluid in the circumferential liquid film of the rotor assembly with the low-pressure fluid on the end face of the end cap.

19. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 18, characterized in that, The low-pressure channel and the high-pressure channel are axially connected by a single cross-section.

20. A magnetically driven, levitation self-correcting rotor-type pressure exchange device according to claim 11, characterized in that, The top housing, the bottom housing, and the end cap are all provided with positioning holes. By matching the positioning holes with each other and assembling pins, the end cap is positioned relative to the top housing and the end cap is positioned relative to the bottom housing.

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