Magnetic drive and suspension self-correction rotor type pressure exchange device

Abstract

The invention belongs to a pressure exchange device, and discloses a magnetically-driven, suspended and self-correcting rotor type pressure exchange device which is characterized in that a top shell and a bottom shell are respectively mounted at the top and the bottom of an 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; a rotor group is placed in the inner shell, the rotor group comprises a rotor main body, a rotor channel and a permanent magnet packaging channel, and a permanent magnet is embedded in the permanent magnet packaging channel; a first suspension correction group, a driving group and a second suspension correction group are arranged on the outer rotary surface of the inner shell and are protected by the outer shell; the driving group is arranged at the axial middle position of the inner shell and is used for interacting with the permanent magnet to drive the rotor group to rotate; and the first suspension correction group and the second suspension correction group have the same structure, are symmetrically arranged, are respectively positioned above and below the driving group, and are used for interacting with the permanent magnets to keep the rotor group in a suspension equilibrium state.

Description

Technical Field

[0001] The invention belongs to a pressure exchange device, and in particular, relates to a rotor type pressure exchange device. Background Art

[0002] As a mature freshwater preparation technology, reverse osmosis membrane desalination technology has been widely used in large, medium and small domestic desalination plants. However, the operating pressure (pressure before the membrane) of the reverse osmosis desalination system can reach 5.5MPa-8.0MPa. The pressure of the concentrated brine after the reverse osmosis membrane is only about 0.2MPa lower than the inlet pressure before the membrane. Direct discharge through the pressure reducing valve will cause serious energy waste. The pressure exchange device can effectively recover the pressure energy in the high-pressure brine, thereby significantly reducing the operating energy consumption of the reverse osmosis desalination system.

[0003] Existing pressure exchange devices can be divided into two types: rotor type and valve-controlled type. Valve-controlled pressure exchange devices occupy a large area and require more parts; while rotor-type pressure exchange devices have been widely used due to their simple equipment, small footprint, and large processing capacity.

[0004] The rotor pressure exchange device is mainly composed of a rotor, an end cover and an outer sleeve. The rotor maintains its coaxiality through the center positioning shaft, and the flow channel is switched by the rotation of the rotor. During the rotation of the rotor, the friction resistance between the center positioning shaft and the rotor is large, and a larger driving force is required to overcome the friction, which will cause a certain amount of energy loss and increase the energy consumption of the system. The rotation of the rotor can be achieved through external drive and hydraulic self-drive. Taking the PX series products developed by ERI in the United States as an example, by designing a special end cover hydraulic structure, the tangential force of the fluid inflow and the inflow flow rate are used to achieve hydraulic self-drive. Although the energy consumption is reduced, the end cover structure is relatively complex, and the speed is greatly limited by the flow rate, making it difficult to flexibly adjust the speed and flow rate. Summary of the invention

[0005] The present invention aims to solve related technical problems of rotor-type pressure exchange devices and provides a magnetically driven, suspended, self-correcting rotor-type pressure exchange device. The rotor is driven to rotate by magnetic force, and the hydraulic configuration of the end cover is simplified. Not only can the flow rate be flexibly adjusted, but also the magnetic force is used to realize the suspension of the internal rotor without a center positioning shaft, thereby reducing the rotational resistance. At the same time, self-correction can be realized during the suspension process to maintain the stability of its operation process.

[0006] In order to achieve the above-mentioned object of the invention, the present invention is implemented by the following technical solutions:

[0007] The present invention provides a magnetically driven, suspended self-correcting rotor-type pressure exchange device, comprising an internal shell, wherein a top shell and a bottom shell are respectively installed on the top and bottom of the internal shell; the top shell is provided with a high-pressure salt water inlet and a low-pressure salt water outlet, and the bottom shell is provided with a low-pressure seawater inlet and a high-pressure seawater outlet;

[0008] The outer rotating surface of the inner shell is provided with a first suspension correction group, a driving group and a second suspension correction group, and the first suspension correction group, the driving group and the second suspension correction group are protected by the outer shell; the driving group is arranged 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; the first suspension correction group and the second suspension correction group have the same structure and are symmetrically arranged, and are respectively located above and below the driving group, and are used to interact with the permanent magnet to keep the rotor group in a suspended equilibrium state;

[0009] The driving group includes third bosses evenly spaced and distributed along the circumference of the internal shell, the number of the third bosses is not less than 4, and a power-on coil is wound around the outside of each of the third bosses, and after the power-on coils are wound, one end of the coil interface faces upward and the other end of the coil interface faces downward; the two coil interfaces of each of the power-on coils are respectively connected to the positive and negative poles, and the upward interfaces or downward interfaces of two adjacent power-on coils are respectively connected to the positive and negative poles; wherein the positive and negative poles are switched by an external frequency converter;

[0010] The first suspension correction group includes a first boss and a second boss which are spaced apart in the axial direction of the inner shell and are arranged correspondingly up and down, and the first boss and the second boss are distributed in the circumferential direction of the inner shell and correspond to the third boss one by one; a first 8-shaped coil is wound around the outside of each group of corresponding first bosses and second bosses, and two first 8-shaped coils on opposite sides of the circumference are connected by two 8-shaped coil first connecting wires;

[0011] The second suspension correction group includes a fourth boss and a fifth boss which are spaced apart in the axial direction of the inner shell and are arranged correspondingly up and down, and the fourth boss and the fifth boss are distributed in the circumferential direction of the inner shell in one-to-one correspondence with the third boss; a second 8-shaped coil is wound around the outside of each group of corresponding fourth bosses and the outside of the fifth bosses, and two of the second 8-shaped coils on opposite sides of the circumference are connected by two 8-shaped coil second connecting wires;

[0012] A rotor group is arranged inside the internal shell, and the rotor group includes a rotor body. A permanent magnet packaging channel is arranged between the rotor channel and the outer rotating surface of the rotor body, and the permanent magnet packaging channel extends axially along the rotor body and is evenly spaced in the circumferential direction; a permanent magnet is embedded in the permanent magnet packaging channel, and the upper and lower ends of the permanent magnet are respectively packaged by a first packaging block and a second packaging block, and the first packaging block and the second packaging block are respectively embedded and installed at the two ends of each permanent magnet packaging channel to form a seal for the permanent magnet packaging channel; the number of the permanent magnets is the same as that of the energized coil, the first 8-shaped coil, and the second 8-shaped coil; the two positive poles or the two negative poles of the adjacent permanent magnets are respectively facing the central axis of the rotor body and facing away from the central axis of the rotor body; end covers are respectively installed between the rotor group and the top shell, and between the rotor group and the bottom shell.

[0013] Furthermore, the inner shell, the top shell, the bottom shell, the first boss, the second boss, the third boss, the fourth boss, the fifth boss, the rotor body, the end cover, and the outer shell are all made of non-magnetic materials.

[0014] Furthermore, the top shell and the bottom shell are respectively fixed to the inner shell by axially arranged bolts, and the bolts are evenly distributed in an annular shape on the top shell and the bottom shell.

[0015] Furthermore, the positioning of the external shell is achieved by matching and assembling the positioning pins and positioning holes respectively provided on the external shell and the top shell and the bottom shell; the fixing of the external shell is achieved by the clamping force provided by the bolts installed on the top shell and the bottom shell.

[0016] Furthermore, the two coil interfaces of the same energized coil are respectively connected to the first connection line of the energized coil and the third connection line of the energized coil, or are respectively connected to the second connection line of the energized coil and the fourth connection line of the energized coil; the two upward interfaces of two adjacent energized coils are respectively connected to the first connection line of the energized coil and the second connection line of the energized coil, and the two downward interfaces of two adjacent energized coils are respectively connected to the third connection line of the energized coil and the fourth connection line of the energized coil; the first connection line of the energized coil and the fourth connection line of the energized coil are used to connect to the same interface of the external frequency converter, and the second connection line of the energized coil and the third connection line of the energized coil are used to connect to another interface of the external frequency converter; two different interfaces of the external frequency converter are used alternately as positive and negative poles.

[0017] Furthermore, the rotor body is provided with a hollow channel along its central axis.

[0018] Furthermore, outer surfaces of the first packaging block and the second packaging block are flush with upper and lower ends of the rotor body.

[0019] Furthermore, the upper and lower end covers have the same structure and are symmetrically arranged. The end cover is provided with an axially through-going low-pressure channel and a high-pressure channel. The end face of the end cover relative to the bottom shell or the top shell is provided with a high-pressure sealing groove and a low-pressure sealing groove. Sealing rings are installed in the high-pressure sealing groove and the low-pressure sealing groove, respectively used to achieve the sealing of high-pressure fluid and low-pressure fluid; the outer rotating surface of the end cover is provided with a circumferential sealing ring, which is used to achieve the sealing of the high-pressure fluid in the circumferential liquid film of the rotor group and the low-pressure fluid on the end face of the end cover.

[0020] Furthermore, the low-pressure channel and the high-pressure channel are structures with axially equal cross-sections.

[0021] Furthermore, the top shell, the bottom shell and the end cover are all provided with positioning holes, and the positioning of the end cover and the top shell, and the positioning of the end cover and the bottom shell are achieved by matching the positioning holes and assembling pins.

[0022] The beneficial effects of the present invention are:

[0023] (1) The magnetically driven, suspended self-correcting rotor pressure exchange device of the present invention embeds a permanent magnet in the rotor group and installs an energized coil on the internal shell, and relies on the interaction force of the magnetic field generated by the two to drive the rotor group to rotate. The power that causes the rotor group to rotate can be adjusted by changing the magnetization of the permanent magnet, the current size of the energized coil and the speed of the current direction switching frequency. In this way, there is no correlation between the rotation speed and flow rate of the rotor group, and the rotation speed and flow rate can be flexibly adjusted separately; at the same time, a new driving mode of magnetic drive is adopted, and there is no need to consider the hydraulic drive problem. The hydraulic structure of the axial spiral gradient can be ignored when designing the end cover, and a simple configuration that maintains axial equal cross-section penetration can be achieved, which is convenient for production and manufacturing.

[0024] (ii) The magnetically driven, suspended self-correcting rotor pressure exchange device of the present invention has a driving group arranged in the circumferential direction of the internal shell, and suspended correction groups are evenly arranged above and below the driving group. Affected by the magnetic field of the permanent magnet in the rotor group, the 8-shaped coil inside the suspended correction group can generate an induced electromotive force when the rotor is not in a suspended equilibrium state, and the rotor group is adjusted to a suspended equilibrium state. At this time, the induced electromotive force in the 8-shaped coil disappears, so that the rotor group can still maintain a suspended equilibrium state when there is no central positioning shaft, thereby eliminating the large friction resistance caused by the central positioning shaft and reducing the overall energy consumption of the device.

[0025] (III) The magnetically driven, suspended self-correcting rotor pressure exchange device of the present invention connects the 8-shaped coils in the suspended correction group in pairs at a 180° circumferential direction. Under the influence of the magnetic field of the permanent magnet in the rotor group, the two connected 8-shaped coils generate an induced electromotive force when the rotor radial direction is offset, and the rotor group is adjusted to a suspended equilibrium state. At this time, the induced electromotive force in the two connected 8-shaped coils disappears, and the rotor group can be self-corrected during the suspension process without the need for external correction equipment, thereby ensuring the coaxiality during rotation, reducing the vibration of the rotor caused by unbalanced rotation, and extending the life of the equipment. At the same time, the device structure is more compact and the operation process is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A front view of a rotor-type pressure exchange device with the outer shell removed provided by an embodiment of the present invention;

[0027] Figure 2 This is an appearance diagram of a rotor-type pressure exchange device provided by an embodiment of the present invention;

[0028] Figure 3 A front cross-sectional view of a rotor-type pressure exchange device provided by an embodiment of the present invention;

[0029] Figure 4 A radial cross-sectional view of a rotor body in a rotor-type pressure exchange device provided by an embodiment of the present invention;

[0030] Figure 5 A diagram showing the relative relationship between a permanent magnet and an energized coil in a rotor-type pressure exchange device provided in an embodiment of the present invention;

[0031] Figure 6 An overall diagram of the end cover of the rotor-type pressure exchange device provided in an embodiment of the present invention;

[0032] Figure 7 This is a main body diagram of the top shell of the rotor-type pressure exchange device provided in an embodiment of the present invention.

[0033] In the above figure: 1. High-pressure brine inlet;

[0034] 2. Low-pressure brine outlet;

[0035] 3. Top shell; 301. First positioning hole, 302. First bolt hole, 303. Second positioning hole;

[0036] 4. First suspension correction group; 401. First boss, 402. First 8-shaped coil, 403. First connecting line of the 8-shaped coil, 404. Second boss;

[0037] 5. Driving group; 501. first connection line of the energized coil, 502. second connection line of the energized coil, 503. third boss, 504. energized coil, 505. third connection line of the energized coil, 506. fourth connection line of the energized coil;

[0038] 6. Second suspension correction group; 601. Fourth boss, 602. Second 8-shaped coil, 603. Second connecting line of the 8-shaped coil, 604. Fifth boss;

[0039] 7. Internal shell;

[0040] 8. Bottom shell; 801. third positioning hole, 802. second bolt hole;

[0041] 9. Low pressure seawater inlet;

[0042] 10. High pressure seawater outlet;

[0043] 11. rotor assembly; 1101. first packaging block, 1102. permanent magnet, 1103. rotor body, 1104. second packaging block; 1105. rotor channel, 1106. permanent magnet packaging channel, 1107. hollow channel;

[0044] 12. End cover; 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;

[0045] 13. External shell; 1301. First positioning pin, 1302. Second positioning pin. DETAILED DESCRIPTION

[0046] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0047] The present invention is based on the basic rotor pressure exchange device structure, and adds a drive group 5 and a permanent magnet 1102 to realize the magnetic drive function; removes the central positioning shaft, adds a first suspension correction group 4 and a second suspension correction group 6 to realize the suspension and self-correction functions of the rotor.

[0048] like Figure 1-Figure 3 As shown, the magnetically driven, suspended self-correcting rotor pressure exchange device of the present invention is mainly composed of a top shell 3, a first suspended correction group 4, a drive group 5, a second suspended correction group 6, an inner shell 7, a bottom shell 8, a rotor group 11, an end cover 12 and an outer shell 13.

[0049] The inner shell 7 and the outer shell 13 are cylindrical structures, and both are made of non-magnetic alloy materials. The outer shell 13 is sleeved outside the inner shell 7, and the top shell 3 and the bottom shell 8 are installed on the top and bottom of the inner shell 7 and the outer shell 13 respectively. The top shell 3 and the bottom shell 8 are both made of non-magnetic alloy materials. The top shell 3 is provided with a plurality of (preferably an even number) first bolt holes 302 uniformly distributed in an annular shape, and the first bolt holes 302 are axially penetrated to install bolts. A bolt blind hole is provided on the corresponding top end face of the inner shell 7 to achieve the fixation of the top shell 3 and the inner shell 7, and the bolts used are all made of non-magnetic materials. The bottom shell 8 is provided with a plurality of (preferably an even number) second bolt holes 802 uniformly distributed in an annular shape, and the second bolt holes 802 are axially penetrated to install bolts. A bolt blind hole is provided on the corresponding bottom end face of the inner shell 7 to achieve the fixation of the bottom shell 8 and the inner shell 7, and the bolts used are all made of non-magnetic materials. The bottom surface of the top shell 3 is provided with a plurality of first positioning holes 301, and the top surface of the bottom shell 8 is provided with a plurality of third positioning holes 801. The first positioning holes 301 and the third positioning holes 801 are both arranged axially and are not through. The number of the first positioning holes 301 and the third positioning holes 801 should be no less than 2, preferably 3-4, and preferably evenly distributed in an annular shape. The top and bottom of the outer shell 13 are respectively provided with a first positioning pin 1301 and a second positioning pin 1302, which are respectively matched and assembled with the first positioning hole 301 and the third positioning hole 801 to realize the positioning of the outer shell 13 with the top shell 3 and the bottom shell 8, and prevent the circumferential rotation and radial movement of the outer shell 13. The high-pressure salt water inlet 1 and the low-pressure salt water outlet 2 are fixed on the top shell 3 by welding, and the outer pipe connection form can adopt a connection structure such as a copy forest or a flange. The low-pressure seawater inlet 9 and the high-pressure seawater outlet 10 are fixed on the bottom shell 8 by welding, and the outer pipe connection form can adopt a connection structure such as a copy forest or a flange.

[0050] The first suspension correction group 4 , the driving group 5 and the second suspension correction group 6 are coupled and arranged on the outer rotating surface of the inner shell 7 , and the outer shell 13 covers the first suspension correction group 4 , the driving group 5 and the second suspension correction group 6 .

[0051] The driving group 5 is used to interact with the permanent magnet 1102 in the rotor group 11 to drive the internal rotor group 11 to rotate. The driving group 5 includes a first connection line 501 of the energized coil, a second connection line 502 of the energized coil, a third boss 503, a energized coil 504, a third connection line 505 of the energized coil, and a fourth connection line 506 of the energized coil. The third boss 503 is a non-magnetic alloy material, which is arranged on the outer rotating surface of the axial middle position of the internal shell 7 and is evenly spaced along the circumference of the internal shell 7. The number of the third bosses 503 should be no less than 4, and can be increased by an even number. The third boss 503 protrudes outward relative to the internal shell 7 so that the energized coil 504 can be wound thereon. Its cross-section can be rectangular, circular, elliptical, or any other shape that can allow the energized coil to be wound. This embodiment adopts a rectangular shape; the third boss 503 can be welded to the internal shell 7, or it can be integrally processed with the internal shell 7. Each third boss 503 is wound with a power-on coil 504 on the outside, and after each power-on coil 504 is wound, one end of the coil interface faces upward and the other end of the coil interface faces downward. The number of turns of the power-on coil 504 can be flexibly adjusted according to the gravity of the rotor group 11 and the required speed range of the rotor group 11. The two coil interfaces of each power-on coil 504 are respectively connected to the positive and negative poles, and the two upward interfaces or the two downward interfaces of two adjacent power-on coils 504 are respectively connected to the positive and negative poles, that is, the positive and negative interfaces of the power-on coil 504 are alternating up and down and left and right (the above positive and negative poles are only distinguished, and the actual positive and negative are adjusted externally).

[0052] Specifically, the two coil interfaces of the same energized coil 504 are respectively connected to the first energized coil connection line 501 and the third energized coil connection line 505, or respectively connected to the second energized coil connection line 502 and the fourth energized coil connection line 506. At the same time, the two upward interfaces of two adjacent energized coils 504 are respectively connected to the first energized coil connection line 501 and the second energized coil connection line 502, and the two downward interfaces of two adjacent energized coils 504 are respectively connected to the third energized coil connection line 505 and the fourth energized coil connection line 506. The first energized coil connection line 501 and the fourth energized coil connection line 506 are used to connect to the same interface of the external frequency converter, and the second energized coil connection line 502 and the third energized coil connection line 505 are used to connect to another interface of the external frequency converter; two different interfaces of the external frequency converter are used alternately as positive and negative poles. The energized coil 504 and the first energized coil connection line 501, the second energized coil connection line 502, the third energized coil connection line 505, and the fourth energized coil connection line 506 are all wrapped with insulating materials to ensure that no current flows through the coils that are in contact with each other. The energized coil 504 and the first energized coil connection line 501, the second energized coil connection line 502, the third energized coil connection line 505, and the fourth energized coil connection line 506 can be fixed by welding.

[0053] A rotor type pressure exchange device has only two suspension correction groups, namely 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, respectively located above and below the driving group 5, and interact with the permanent magnet 1102 in the rotor group 11 to keep the rotor group 11 in a suspended equilibrium state, realizing the function of suspension self-correction during the working process.

[0054] The first suspension correction group 4 is located in the upper part of the internal shell 7 (above the driving group 5), and includes a first boss 401, a first 8-shaped coil 402, a first connecting line 403 of the 8-shaped coil, and a second boss 404. The first boss 401 and the second boss 404 have the same structure and are both made of non-magnetic alloy materials. They have a certain spacing in the axial direction of the internal shell 7 and are arranged correspondingly up and down, wherein the first boss 401 is on the top and the second boss 404 is on the bottom. The number of the first boss 401 and the second boss 404 is the same, and they are evenly spaced along the circumference of the internal shell 7, and the circumferential distribution of the internal shell 7 is completely corresponding to the third boss 503. The first boss 401 and the second boss 404 protrude outward relative to the internal shell 7 so that the first 8-shaped coil 402 can be wound thereon. The cross-sectional shape can be any shape such as rectangular, circular, elliptical, etc. that can allow the first 8-shaped coil 402 to be wound. In this embodiment, a rectangular shape is adopted; the first boss 401 and the second boss 404 can be welded to the internal shell 7, or they can be integrally processed and formed with the internal shell 7. A first 8-shaped coil 402 is wound in a twisted "8" shape around the outside of the first boss 401 and the outside of the second boss 404 corresponding to the upper and lower parts, and the number of the first 8-shaped coils 402 is also consistent with the number of the first boss 401 and the second boss 404. The two interfaces of the two first 8-shaped coils 402 on opposite sides of the circumference (i.e., an angle of 180°) are respectively connected through two 8-shaped coil first connecting wires 403, wherein the first 8-shaped coil 402 and the 8-shaped coil first connecting wire 403 are both wrapped with insulating materials to ensure that no current flows through the coils that are in contact with each other, and the first 8-shaped coil 402 and the 8-shaped coil first connecting wire 403 are fixed by welding.

[0055] The second suspension correction group 6 is located in the lower half of the internal shell 7 (below the drive group 5), and includes a fourth boss 601, a second 8-shaped coil 602, a second connecting line 603 of the 8-shaped coil, and a fifth boss 604. The fourth boss 601 and the fifth boss 604 have the same structure and are both made of non-magnetic alloy materials. They have a certain spacing in the axial direction of the internal shell 7 and are arranged correspondingly up and down, wherein the fourth boss 601 is on the top and the fifth boss 604 is on the bottom. The fourth boss 601 and the fifth boss 604 are the same in number, and are evenly spaced and distributed along the circumference of the internal shell 7, and their circumferential distribution in the internal shell 7 completely corresponds to the third boss 503. The fourth boss 601 and the fifth boss 604 protrude outward relative to the internal housing 7 so that the second 8-shaped coil 602 can be wound thereon. The cross-sectional shape thereof can be any shape such as a rectangle, a circle, an ellipse, etc. that can be wound around the second 8-shaped coil 402. In this embodiment, a rectangle is adopted. The fourth boss 601 and the fifth boss 604 can be welded to the internal housing 7 or can be integrally formed with the internal housing 7. A second 8-shaped coil 602 is wound around the outer portion of the fourth boss 601 and the outer portion of the fifth boss 604 corresponding to the upper and lower portions in a twisted "8" shape. The number of the second 8-shaped coils 602 is also the same as the number of the fourth boss 601 and the fifth boss 604. The two interfaces of the two second 8-shaped coils 602 on the opposite sides of the circumference (i.e., an angle of 180°) are respectively connected by two 8-shaped coil second connecting wires 603, wherein the second 8-shaped coils 602 and the 8-shaped coil second connecting wires 603 are wrapped with insulating materials on the outside to ensure that no current passes through the coils that are in contact with each other, and the second 8-shaped coils 602 and the 8-shaped coil second connecting wires 603 are fixed by welding.

[0056] Combination Figure 3-Figure 5As shown, the rotor assembly 11 is located inside the internal shell 7, and includes a first packaging block 1101, a permanent magnet 1102, a rotor body 1103 and a second packaging block 1104. The rotor body 1103 is made of a wear-resistant non-magnetic material. In addition to the rotor channel 1105, a plurality of permanent magnet packaging channels 1106 are provided. The permanent magnet packaging channels 1106 extend axially along the rotor body 1103 and are evenly spaced in the circumferential direction. The permanent magnet packaging channels 1106 are located between the rotor channel 1105 and the outer rotating surface of the rotor body 1103. The permanent magnet packaging channel 1106 is embedded in the permanent magnet 1102, and the upper and lower ends of the permanent magnet 1102 are respectively packaged by the first packaging block 1101 and the second packaging block 1104 to isolate the contact between water and the permanent magnet 1102, thereby sealing the permanent magnet 1102. The first encapsulation block 1101 and the second encapsulation block 1104 are sealing materials with good elasticity and wear resistance, and are respectively embedded and installed at the two ends of each permanent magnet encapsulation channel 1106, and 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, and the first encapsulation block 1101 and the second encapsulation block 1104 can be fixed by applying adhesive on the surface in contact with the permanent magnet 1102. The arrangement of each permanent magnet 1102 should ensure that the positive and negative poles of adjacent permanent magnets 1102 are in opposite directions, that is, the two positive poles or two negative poles of adjacent permanent magnets 1102 are respectively facing the central axis of the rotor body 1103 and facing away from the central axis of the rotor body 1103. The magnetization amount of the permanent magnet 1102 depends on the gravity of the rotor group 11 and the required speed range of the rotor group 11. The number of the permanent magnet 1102 is the same as the third boss 503, the energized coil 504, the first boss 401, the second boss 404, the first 8-shaped coil 402, the fourth boss 601, the fifth boss 604, and the second 8-shaped coil 602. The top of the first 8-shaped coil 402 and the bottom of the second 8-shaped coil 602 are flush with the upper and lower end faces of the permanent magnet 1102 respectively.

[0057] Preferably, the rotor body 1103 is provided with a hollow channel 1107 along its central axis, and the hollow channel 1107 is used to reduce the gravity of the rotor body 1103 and reduce the magnetic force required to drive the rotor group 11 to rotate. During normal operation, the fluid flows through the rotating rotor channel 1105. Due to the effect of the magnetic force, the rotor group 11 rotates in a suspended equilibrium state at the middle position of the internal shell 7 during normal operation. The suspended equilibrium state means that the end surface liquid film thickness of the gap between the upper and lower end surfaces of the rotor group 11 and the end surface of the end cover 12 is in a basically equal dynamic stable state, and the circumferential liquid film thickness of the annulus between the outer circumference of the rotor group 11 and the inner circumference of the internal shell 7 is in a basically equal dynamic stable state.

[0058] Combination Figure 6As shown, end covers 12 are respectively installed between the rotor group 11 and the top shell 3 and between the rotor group 11 and the bottom shell 8. The upper and lower end covers 12 have the same structure and are symmetrically arranged, and are made of wear-resistant non-magnetic material.

[0059] The end cover 12 is provided with an axially through low-pressure channel 1201 and a high-pressure channel 1202, which are used to circulate high-pressure brine, high-pressure seawater and low-pressure brine, low-pressure seawater respectively. The end face of the end cover 12 relative to the bottom shell 8 or the top shell 3 is provided with a high-pressure sealing groove 1203 and a low-pressure sealing groove 1206, and sealing rings are installed in 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. The high-pressure sealing groove 1203 is generally arranged around the high-pressure channel 1202, and its contour is usually annular. The low-pressure sealing groove 1206 is generally arranged at a position close to the outer edge of the end cover 12, and its contour is usually circular. In addition, the outer side of the low-pressure sealing groove 1206 cannot be too close to the outer circumference of the end cover 12 to ensure the strength of the seal. The outer rotating surface of the end cover 12 is provided with a circumferential sealing ring 1204 to prevent the leakage of the high-pressure fluid in the circumferential liquid film of the rotor group 11.

[0060] The high-pressure brine flowing in through the high-pressure brine inlet 1 flows through the high-pressure channel 1202 of the end cover 12 and enters the rotor channel 1105 for pressure exchange; the low-pressure brine that completes the pressure exchange inside the rotor channel 1105 flows through the low-pressure channel 1201 of the end cover 12 and flows out through the low-pressure brine outlet 2. Different from the rotor-type pressure exchange device driven by hydraulic force, which requires an axial spiral gradient hydraulic structure to realize the use of the tangential component of the fluid inflow to impact the rotor rotation, the rotation speed has a greater correlation with the flow rate and spiral angle of the fluid; since the present invention relies on magnetic drive, the low-pressure channel 1201 and the high-pressure channel 1202 of the end cover 12 do not need to design a complex hydraulic structure, and can maintain an axially uniform cross-section through structure.

[0061] Combination Figure 7 As shown, in addition to the first positioning hole 301 and the first bolt hole 302, the top shell 3 is provided with a second positioning hole 303 on the surface opposite to the end cover 12. The second positioning hole 303 and the fourth positioning hole 1205 on the surface opposite to the end cover 12 are matched with each other and assembled with pins to achieve the positioning of the end cover 12, wherein the second positioning hole 303 and the fourth positioning hole 1205 are both blind holes, the number is the same (generally not less than 2), and they are evenly distributed in an annular shape. The positioning method of the bottom shell 8 and the end cover 12 is the same as the positioning method of the top shell 3 and the end cover 12, and will not be repeated here.

[0062] The working process of the magnetically driven, suspended self-correcting rotor pressure exchange device of the present invention is as follows:

[0063] The working process of the pressure exchange device includes a pressurization process and a pressure relief process. The pressurization process is: high-pressure salt water flows in from the high-pressure salt water inlet 1, enters the rotor channel 1105 through the high-pressure channel 1202, pressurizes the low-pressure seawater pre-filled in the rotor channel 1105, and the pressurized high-pressure seawater is discharged from the rotor channel 1105, the high-pressure channel 1202 and the high-pressure seawater outlet 10 in sequence; the pressure relief process is: low-pressure seawater flows in from the low-pressure seawater inlet 9, enters the rotor channel 1105 through the low-pressure channel 1201, and depressurizes the high-pressure salt water in the rotor channel 1105, and the depressurized low-pressure salt water is discharged from the rotor channel 1105, the low-pressure channel 1201 and the low-pressure salt water outlet 2 in sequence.

[0064] The driving process of the rotor is as follows: the energized coil 504 in the driving group 5 is connected to the external frequency converter through the first energized coil connection line 501, the second energized coil connection line 502, the third energized coil connection line 505, and the third energized coil connection line 506. The external frequency converter changes the flow direction of the current 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, so that the rotor group 11 is subjected to the force of attraction and repulsion and then rotates. During the movement of the rotor group 11, these two forces are driving forces, and the magnitude of the driving force depends on the magnetization amount of the permanent magnet 1102, the current magnitude of the energized coil 504, and the frequency of the change in the direction of the current.

[0065] The suspension correction process of the rotor is as follows: when the rotor group 11 is in a suspension equilibrium state, the magnetic field generated by the permanent magnet 1102 encapsulated inside the rotor group 11 makes the induced electromotive force generated by the first 8-shaped coil 402 in the first suspension correction group 4 and the second 8-shaped coil 602 in the second suspension correction group 6 both zero. At this time, no current flows inside the first 8-shaped coil 402 and the second 8-shaped coil 602, and the rotor group 11 maintains its suspension equilibrium state unchanged. When the rotor group 11 deviates downward, the magnetic fluxes passing through the upper and lower circles of the "8" shape of the first 8-shaped coil 402 are different, and the magnetic flux passing through the upper circle is smaller, so that the induced electromotive force generated in the upper circle is smaller than the induced electromotive force generated in the lower coil, and an induced current is generated inside the first 8-shaped coil 402. The magnetic field generated by the induced current interacts with the magnetic field generated by the permanent magnet 1102, which will cause the rotor group 11 to return to a suspended equilibrium state; when the rotor group 11 deviates upward, the magnetic fluxes passing through the upper and lower circles of the "8" shape of the second 8-shaped coil 602 are different, and the magnetic flux passing through the lower circle is smaller, so that the induced electromotive force generated in the lower circle is smaller than the induced electromotive force generated in the upper coil, and an induced current is generated inside the second 8-shaped coil 602. The magnetic field generated by the induced current interacts with the magnetic field generated by the permanent magnet 1102, which will cause the rotor group 11 to return to a suspended equilibrium state. Since the 8-shaped coil on the opposite side is in a connected state, when the rotor group 11 deviates left or right, the two opposite 8-shaped coils parallel to the deviating direction will also generate an induced electromotive force due to the movement of the magnetic field of the rotor group 11, and then the induced current generated in the two opposite 8-shaped coils, and the magnetic field generated thereby will also cause the rotor group 11 to return to a suspended equilibrium state.

[0066] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A magnetically driven, suspended self-correcting rotor pressure exchange device, characterized in that: It comprises an internal shell, wherein a top shell and a bottom shell are respectively installed on the top and the bottom of the internal shell; the top shell is provided with a high-pressure salt water inlet and a low-pressure salt water 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 driving group and a second suspension correction group, and the first suspension correction group, the driving group and the second suspension correction group are protected by the outer shell; the driving group is arranged 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; the first suspension correction group and the second suspension correction group have the same structure and are symmetrically arranged, and are respectively located above and below the driving group, and are used to interact with the permanent magnet to keep the rotor group in a suspended equilibrium state; The driving group includes third bosses evenly spaced and distributed along the circumference of the internal shell, the number of the third bosses is not less than 4, and a power-on coil is wound around the outside of each of the third bosses, and after the power-on coils are wound, one end of the coil interface faces upward and the other end of the coil interface faces downward; the two coil interfaces of each of the power-on coils are respectively connected to the positive and negative poles, and the upward interfaces or downward interfaces of two adjacent power-on coils are respectively connected to the positive and negative poles; wherein the positive and negative poles are switched by an external frequency converter; The first suspension correction group includes a first boss and a second boss which are spaced apart in the axial direction of the inner shell and are arranged correspondingly up and down, and the first boss and the second boss are distributed in the circumferential direction of the inner shell and correspond to the third boss one by one; a first 8-shaped coil is wound around the outside of each group of corresponding first bosses and second bosses, and two first 8-shaped coils on opposite sides of the circumference are connected by two 8-shaped coil first connecting wires; The second suspension correction group includes a fourth boss and a fifth boss which are spaced apart in the axial direction of the inner shell and are arranged correspondingly up and down, and the fourth boss and the fifth boss are distributed in the circumferential direction of the inner shell in one-to-one correspondence with the third boss; a second 8-shaped coil is wound around the outside of each group of corresponding fourth bosses and the outside of the fifth bosses, and two of the second 8-shaped coils on opposite sides of the circumference are connected by two 8-shaped coil second connecting wires; A rotor group is arranged inside the internal shell, and the rotor group includes a rotor body. A permanent magnet packaging channel is arranged between the rotor channel and the outer rotating surface of the rotor body, and the permanent magnet packaging channel extends axially along the rotor body and is evenly spaced in the circumferential direction; a permanent magnet is embedded in the permanent magnet packaging channel, and the upper and lower ends of the permanent magnet are respectively packaged by a first packaging block and a second packaging block, and the first packaging block and the second packaging block are respectively embedded and installed at the two ends of each permanent magnet packaging channel to form a seal for the permanent magnet packaging channel; the number of the permanent magnets is the same as that of the energized coil, the first 8-shaped coil, and the second 8-shaped coil; the two positive poles or the two negative poles of the adjacent permanent magnets are respectively facing the central axis of the rotor body and facing away from the central axis of the rotor body; end covers are respectively installed between the rotor group and the top shell, and between the rotor group and the bottom shell.

2. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 1, characterized in that: The inner shell, the top shell, the bottom shell, the first boss, the second boss, the third boss, the fourth boss, the fifth boss, the rotor body, the end cover, and the outer shell are all made of non-magnetic materials.

3. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 1, characterized in that: The top shell and the bottom shell are fixed to the inner shell respectively by axially arranged bolts, and the bolts are evenly distributed in an annular shape on the top shell and the bottom shell.

4. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 1, characterized in that: The positioning of the external shell is achieved by matching and assembling the positioning pins and positioning holes respectively provided on the external shell and the top shell and the bottom shell; the fixing of the external shell is achieved by the clamping force provided by the bolts installed on the top shell and the bottom shell.

5. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 1, characterized in that: The two coil interfaces of the same energized coil are respectively connected to the first connection line of the energized coil and the third connection line of the energized coil, or are respectively connected to the second connection line of the energized coil and the fourth connection line of the energized coil; the two upward interfaces of two adjacent energized coils are respectively connected to the first connection line of the energized coil and the second connection line of the energized coil, and the two downward interfaces of two adjacent energized coils are respectively connected to the third connection line of the energized coil and the fourth connection line of the energized coil; the first connection line of the energized coil and the fourth connection line of the energized coil are used to connect to the same interface of the external frequency converter, and the second connection line of the energized coil and the third connection line of the energized coil are used to connect to another interface of the external frequency converter; two different interfaces of the external frequency converter are used alternately as positive and negative poles.

6. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 1, characterized in that: The rotor body is provided with a hollow channel along its central axis.

7. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 1, characterized in that: The outer surfaces of the first packaging block and the second packaging block are flush with the upper and lower ends of the rotor body.

8. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 1, characterized in that: The upper and lower end covers have the same structure and are symmetrically arranged. The end cover is provided with an axially through-going low-pressure channel and a high-pressure channel. The end face of the end cover relative to the bottom shell or the top shell is provided with a high-pressure sealing groove and a low-pressure sealing groove; sealing rings are installed in the high-pressure sealing groove and the low-pressure sealing groove, respectively used to achieve the sealing of high-pressure fluid and low-pressure fluid; the outer rotating surface of the end cover is provided with a circumferential sealing ring, which is used to achieve the sealing of the high-pressure fluid in the circumferential liquid film of the rotor group and the low-pressure fluid on the end face of the end cover.

9. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 8, characterized in that: The low-pressure channel and the high-pressure channel are structures that are axially connected with equal cross-sections.

10. A magnetically driven, suspended self-correcting rotor pressure exchange device according to claim 1, characterized in that: The top shell, the bottom shell and the end cover are all provided with positioning holes, and the positioning of the end cover and the top shell, and the positioning of the end cover and the bottom shell are achieved by matching the positioning holes with each other and assembling pins.

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