Fluid switch, seawater desalination energy recovery column and array structure thereof

Abstract

This invention belongs to the field of liquid residual pressure energy recovery and utilization technology in process industries. It discloses a novel fluid switcher and, based on this, develops a novel seawater desalination energy recovery tower and a typical parallel array configuration, aiming to solve the problems of complex structure and low reliability of the original valve-controlled device. This invention vertically arranges the pressure exchange cylinder, significantly reducing the footprint and making capacity expansion more flexible and convenient. The internal cavity design of the fluid switcher at the brine end and the check valve assembly at the seawater end is more compact and smooth, and the design of the inlet and outlet pipe interfaces for each fluid stream is more rational. The flow pattern and uniformity of the fluid flowing directly into or out of the main pipe are better, resulting in less flow resistance loss and further improving the energy recovery efficiency and reliability of the device.

Description

Technical Field

[0001] This invention belongs to the field of liquid residual pressure energy recovery and utilization technology in process industries. Specifically, it relates to a reverse osmosis seawater desalination energy recovery device that facilitates pressure energy exchange between pressurized liquid and pressurized liquid. Background Technology

[0002] Reverse osmosis desalination, as an important high-tech method for producing freshwater from seawater, has been widely adopted in coastal areas worldwide. This technology is a pressure-driven membrane separation process. In the process, the feed seawater is first pressurized to 5.5-8.0 MPa by a high-pressure pump, and then enters the reverse osmosis membrane module for salt / water separation. The desalinated water produced by the reverse osmosis membrane accounts for approximately 45% of the total feed water, while about 55% of the seawater is retained and concentrated by the reverse osmosis membrane, with a pressure still exceeding 5.0 MPa. Directly discharging this high-pressure brine would result in a significant waste of system energy. Therefore, employing energy recovery devices to efficiently recover and utilize the pressure energy in the high-pressure brine has become an important way to achieve energy conservation, emission reduction, and green, low-carbon development in reverse osmosis desalination systems.

[0003] Energy recovery devices, as a key component of reverse osmosis seawater desalination technology, are mainly classified into two categories based on their working principle: centrifugal and positive displacement. Centrifugal devices, as an earlier product, have an energy recovery efficiency of 50-80%, while positive displacement energy recovery devices only require a one-step "pressure energy-pressure energy" conversion, achieving an energy recovery efficiency of over 95%, and have become the mainstream product for research, development, and market application both domestically and internationally. Valve-regulated energy recovery devices are a typical example of positive displacement energy recovery devices. This type of device generally consists of a fluid switcher at the brine end, a pressure exchange cylinder, and a check valve assembly at the seawater end. Through the reciprocating switching of the fluid switcher and the passive response of the check valve assembly, the pressurization and depressurization processes of a single-cylinder device are alternately completed. By arranging single-cylinder devices in parallel arrays, such as double-cylinder, triple-cylinder, or higher configurations, continuous and stable pressure exchange processes can be achieved.

[0004] The fluid switcher at the brine end is the core component of this device. Patent 201310005355.5 discloses a reciprocating self-sealing fluid switcher with a single pressure exchange cylinder. It primarily reduces the driving power and energy consumption of the valve core assembly by adding pre-pressurization and pre-depressurization valve plates to the outside of the high-pressure and low-pressure chamber valve plates. However, this patent has the following shortcomings: First, both the high-pressure and low-pressure chamber valve core assemblies are combined valve plate structures, opening and closing sequentially during switching, resulting in a complex structure and easy damage to small components, reducing the reliability of the switcher's reciprocating motion. Second, although pre-pressurization and pre-depressurization valve plates are introduced to the outside of the valve plates, the pressure difference resistance on both sides during the valve plate opening and closing process is not fundamentally eliminated, and the driving force remains relatively large during switching. Third, the split-chamber structure design of the switcher increases the complexity of the fluid flow, creating numerous dead-end areas, resulting in significant flow resistance losses and reduced energy recovery efficiency. Summary of the Invention

[0005] This invention addresses the technical problems of existing valve-controlled energy recovery devices, such as complex fluid switch structure, low valve plate reliability, and still high drive power and energy consumption. It designs a novel fluid switch and, based on this, develops a novel seawater desalination energy recovery tower and a typical parallel array configuration, aiming to solve the problems of complex structure and low reliability of the original valve-controlled device.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] According to one aspect of the present invention, a fluid switcher is provided, comprising a switcher valve body, one end of which is coaxially connected to a pressure relief chamber housing and the other end of which is coaxially connected to a high-pressure chamber connector.

[0008] The switch valve body has a coaxially arranged axial through cavity, which includes a switch intermediate cavity and a switch first concave cavity and a switch second concave cavity at both ends. The inner diameter of the switch first concave cavity and the switch second concave cavity are both larger than the inner diameter of the switch intermediate cavity. The junction of the switch intermediate cavity with the switch first concave cavity and the switch second concave cavity is respectively provided with a chamfer, thereby forming a conical structure.

[0009] The switch valve body is provided with a pressure exchange cylinder first interface along its radial direction. The pressure exchange cylinder first interface is connected to the intermediate cavity of the switch and is used to connect the pressure exchange cylinder.

[0010] The axial through cavity of the switcher is equipped with a first internal component of the switching valve and a second internal component of the switching valve, both of which are integrally formed structures.

[0011] The first internal component of the switching valve includes a first connecting shaft, a first valve plate, and a second connecting shaft connected coaxially in sequence. The first valve plate is slidable within the intermediate cavity of the switcher. A first limiting end is coaxially provided on the side of the first valve plate facing the first connecting shaft, and the diameter of the first limiting end is larger than the inner diameter of the intermediate cavity of the switcher. The stepped surface of the first limiting end is machined into an arc-shaped surface to form a line seal with the conical structure at the junction of the intermediate cavity of the switcher and the first concave cavity of the switcher. Multiple sealing water lines are provided on the circumferential surface of the first valve plate to form a circumferential seal with the intermediate cavity of the switcher. A first radial flow portion and a first positioning ring are coaxially provided on the side of the first valve plate facing the second connecting shaft. The first radial flow portion is located between the first valve plate and the first positioning ring. The first positioning ring ensures that the first internal component of the switching valve never detaches from the intermediate cavity of the switcher during the switching process.

[0012] The second internal component of the switching valve includes a third connecting shaft and a second valve plate coaxially connected, with the third connecting shaft threadedly connected to the second connecting shaft; the second valve plate, the second limiting end, the second radial flow portion, and the second positioning ring are structurally identical and symmetrically arranged with the first valve plate, the first limiting end, the first radial flow portion, and the first positioning ring, respectively; the stepped surface of the second limiting end is machined into an arc-shaped surface to form a line seal with the conical surface structure at the junction of the intermediate cavity of the switcher and the second concave cavity of the switcher; the circumferential surface of the second valve plate is provided with multiple sealing water lines to form a circumferential seal with the intermediate cavity of the switcher;

[0013] The pressure relief chamber housing is closed at one end and has its axial inner cavity extending through the other end. A drive shaft is coaxially arranged in the axial inner cavity. One end of the drive shaft passes through the closed end of the pressure relief chamber housing and is used to connect to an external drive mechanism. The other end is threadedly connected to the first connecting shaft. A balance piston is mounted on the drive shaft and can slide in the axial inner cavity. The balance piston divides the axial inner cavity into a balance cavity and a pressure relief cavity, wherein the balance cavity is located between the closed end of the pressure relief chamber housing and the balance piston. The pressure relief chamber housing is connected to the switch valve body through a flange, so that the pressure relief cavity is connected to the first cavity of the switch. The pressure relief chamber housing has a through pressure relief fluid outlet along its radial direction. The pressure relief fluid outlet is connected to the pressure relief cavity but is never connected to the balance cavity.

[0014] The high-pressure chamber connector is provided with an axially penetrating high-pressure fluid inlet; the high-pressure chamber connector is connected to the switch valve body via a flange, so that the high-pressure fluid inlet is connected to the second cavity of the switch.

[0015] The sidewall of the switch valve body and the sidewall of the pressure relief chamber housing are respectively provided with flow holes at the same circumferential angle. The two flow holes are respectively connected to the balance chamber and the second cavity of the switch. The two flow holes are connected by a balance pipe. The balance pipe is provided with a flow regulating valve. The flow regulating valve is used to introduce high-pressure fluid into the balance chamber, so as to apply a pressure difference force to the first internal component and the second internal component of the switch valve through the drive shaft, so as to balance the pressure difference force during the opening process of the first internal component and the second internal component of the switch valve.

[0016] Furthermore, the first radial flow section includes a plurality of radial flow windows for fluid flow and ribs between the radial flow windows, wherein the outer diameter of the ribs is the same as the outer diameter of the first valve plate and the first positioning ring;

[0017] The second radial flow section includes a plurality of radial flow windows for fluid flow and ribs between the radial flow windows, wherein the outer diameter of the ribs is the same as the outer diameter of the second valve plate and the second positioning ring.

[0018] Furthermore, one side of the balance piston is limited by a shaft platform on the drive shaft, and the other side is fixed by a locking nut mounted on the drive shaft.

[0019] Furthermore, the central hole of the balance piston is provided with a seal for static sealing, and the outer circumferential surface is provided with a seal for dynamic sealing.

[0020] Furthermore, the drive shaft, the balance piston, the first internal component of the switching valve, and the second internal component of the switching valve are all coaxially arranged.

[0021] According to another aspect of the present invention, a seawater desalination energy recovery tower is provided, comprising a vertically arranged pressure exchange cylinder, the upper part of which is connected to the aforementioned fluid switch, the fluid switch serving as the brine end; and a check valve assembly connected to the lower part of the pressure exchange cylinder, the check valve assembly serving as the seawater end.

[0022] The fluid switcher is connected to the pressure exchange cylinder through the first interface of the pressure exchange cylinder, and the check valve assembly is connected to the pressure exchange cylinder through the second interface of the pressure exchange cylinder.

[0023] Furthermore, the check valve assembly includes a check valve body, one end of which is coaxially connected to a pressurization chamber housing, and the other end is coaxially connected to a low-pressure chamber connector.

[0024] The check valve body has a coaxially arranged check valve axial through cavity inside, which includes a check valve intermediate cavity and a check valve first recess and a check valve second recess at both ends; the inner diameter of the check valve first recess and the check valve second recess are both larger than the inner diameter of the check valve intermediate cavity.

[0025] The check valve body is provided with the second port of the pressure exchange cylinder along its radial direction, and the second port of the pressure exchange cylinder is connected to the intermediate cavity of the check valve.

[0026] The pressure chamber housing is coaxially arranged inside the pressure chamber housing. One end of the pressure chamber housing is radially provided with a pressure fluid outlet. The other end of the pressure chamber housing is connected to the check valve body through a flange, so that the pressure chamber is connected to the first cavity of the check valve.

[0027] The low-pressure chamber connector is coaxially provided with a low-pressure fluid inlet. The low-pressure chamber connector is connected to the check valve body through a flange, so that the low-pressure fluid inlet is connected to the second cavity of the check valve.

[0028] A first sleeve of the check valve is fixed at the junction of the pressurization chamber housing and the check valve body, and a second sleeve of the check valve is fixed at the junction of the intermediate cavity of the check valve and the second concave cavity of the check valve. A first inner component of the check valve and a second inner component of the check valve are respectively installed on the first sleeve and the second sleeve. The first sleeve, the second sleeve, the first inner component, and the second inner component of the check valve are all coaxially arranged with the check valve body.

[0029] The first and second internal components of the check valve have the same structure and installation direction, each including a central shaft and a valve plate integrally connected to one end of the central shaft. A spring is fitted outside the central shaft. The central shaft of the first internal component passes through the first sleeve of the check valve and can slide relative to it. The valve plate of the first internal component moves within the first cavity of the check valve and its diameter is larger than the inner diameter of the intermediate cavity of the check valve. The spring of the first internal component is located between its valve plate and the first sleeve of the check valve. The central shaft of the second internal component passes through the second sleeve of the check valve and can slide relative to it. The valve plate of the second internal component moves within the second cavity of the check valve and its diameter is larger than the inner diameter of the low-pressure fluid inlet. The spring of the second internal component is located between its valve plate and the second sleeve of the check valve.

[0030] Furthermore, the first and second sleeves of the check valve have the same structure, both including a fixed ring and a central ring arranged in concentric circles. The central ring and the fixed ring are connected by radially evenly distributed connecting parts. The fixed ring is used to fix the first and second sleeves of the check valve, and the central ring is used to install the first and second internal components of the check valve.

[0031] According to another aspect of the present invention, a seawater desalination energy recovery tower array structure is provided, comprising one or more seawater desalination energy recovery tower basic units arranged side by side, each seawater desalination energy recovery tower basic unit comprising two of the above-mentioned seawater desalination energy recovery towers, wherein the fluid switchers and check valve groups in the two seawater desalination energy recovery towers in each seawater desalination energy recovery tower basic unit are symmetrically arranged.

[0032] Furthermore, in each of the basic units of the seawater desalination energy recovery tower, the high-pressure fluid inlet direction in the fluid switch of the two seawater desalination energy recovery towers is opposite to the low-pressure fluid inlet direction in the check valve group;

[0033] In the fluid switchers of the two seawater desalination energy recovery towers, the high-pressure fluid inlet is directly connected to the same high-pressure brine header, and the pressure relief fluid outlet is directly connected to two pressure relief brine headers respectively.

[0034] The low-pressure fluid inlet of the check valve assembly in the two seawater desalination energy recovery towers is directly connected to the same low-pressure seawater header, and the pressurized fluid outlet is directly connected to two pressurized seawater headers respectively.

[0035] Furthermore, the axial directions of the high-pressure brine header and the depressurization brine header are both perpendicular to the axial direction of the fluid switcher and the axial direction of the pressure exchange cylinder.

[0036] Furthermore, the axial directions of the low-pressure seawater header and the pressurized seawater header are both perpendicular to the axial direction of the check valve assembly and the axial direction of the pressure exchange cylinder.

[0037] The beneficial effects of this invention are:

[0038] (i) For fluid switchers, a balance piston is added to the drive shaft to balance the pressure difference on both sides of the valve plate during the opening and closing process, thereby fundamentally reducing the driving force. In other words, high-pressure fluid is introduced into the balance chamber through the balance pipe. In this way, the huge pressure difference on both sides during the opening of the first / second internal parts of the switching valve can be offset by the pressure difference on both sides of the balance piston, thereby fundamentally eliminating the problem of large driving force energy consumption caused by the pressure difference on both sides of the first / second internal parts of the switching valve during the switching process. The flow regulating valve set on the balance pipe and the balance chamber form a damping orifice structure, which has a damping effect, making the switching speed of the external drive mechanism more stable during the switching process.

[0039] (ii) For fluid switchers, the first / second internal components of the switching valve are both stepped integrated structures with fewer parts and reliable function, which can avoid the problem of high and low pressure crossflow of fluid during the switching process; the first / second internal components of the switching valve and the end face line seal and circumferential seal of the switcher valve body form a double seal, which is conducive to enhancing the sealing effect; the positioning ring ensures that the first / second internal components of the switching valve do not leave the intermediate cavity of the switcher during the switching process, avoiding the impact and jamming caused by the valve plate entering and leaving the intermediate cavity of the switcher during the switching process.

[0040] (iii) For the check valve assembly, two check valves are integrated into one valve body structure, corresponding to the fluid switch, which simplifies the number of device parts, reduces manufacturing costs, and makes the whole unit more streamlined and compact, facilitating installation, maintenance and parallel array.

[0041] (iv) For the energy recovery tower and its array, the vertical arrangement of the pressure exchange cylinder greatly reduces the footprint of the device, and the capacity expansion of the device is more flexible and convenient; the internal cavity design of the fluid switch at the brine end and the check valve group at the seawater end is more compact and smooth, the interface design of each fluid inlet and outlet pipe is more reasonable, the fluid flow pattern and uniformity of the fluid flowing directly into or out of the main pipe are better, the flow resistance loss is smaller, and the energy recovery efficiency and reliability of the device are further improved. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of the seawater desalination energy recovery tower provided in an embodiment of the present invention;

[0043] Figure 2 This is a schematic cross-sectional view of the fluid switch in the pressurization working position provided in an embodiment of the present invention;

[0044] Figure 3 This is a schematic cross-sectional view of the fluid switch in the pressure relief working position provided in an embodiment of the present invention;

[0045] Figure 4 This is a cross-sectional schematic diagram of the switch valve body in the fluid switch provided in an embodiment of the present invention;

[0046] Figure 5 (a) Schematic diagram of the structure of the first internal component of the switching valve in the fluid switcher provided in the embodiment of the present invention; (b) Schematic diagram of the cross section.

[0047] Figure 6 (a) A cross-sectional view and (b) a side view of the second internal component of the switching valve in the fluid switcher provided in the embodiment of the present invention;

[0048] Figure 7 This is a schematic cross-sectional view of the check valve assembly in the pressurization working position provided in an embodiment of the present invention;

[0049] Figure 8 This is a schematic cross-sectional view of the check valve assembly in the pressure relief working position provided in an embodiment of the present invention;

[0050] Figure 9 This is a cross-sectional schematic diagram of the check valve body in the check valve assembly provided in an embodiment of the present invention;

[0051] Figure 10 This is a side view of the first / second sleeve of the check valve in the check valve assembly provided in an embodiment of the present invention;

[0052] Figure 11 This is a three-dimensional structural diagram of a 2*3 multi-cylinder array for seawater desalination energy recovery tower provided in an embodiment of the present invention;

[0053] Figure 12 (a) Front view, (b) Top view, and (c) Side view of a 2*3 multi-cylinder array for seawater desalination energy recovery tower provided in an embodiment of the present invention.

[0054] In the above diagram: 1: Fluid switch; 2: Check valve assembly; 3: Pressure exchange cylinder; 4: Brine reducer; 5: Seawater reducer; 6: First flange of reducer; 7: Second flange of reducer; 8: Third flange of reducer; 9: Fourth flange of reducer; 10: High-pressure brine main pipe; 11: Depressurized brine main pipe; 12: Low-pressure seawater main pipe; 13: Pressurized seawater main pipe;

[0055] 101: Drive shaft; 102: Balance piston; 103: Locking nut; 104: Pressure relief chamber housing; 105: Balance pipe; 106: Flow regulating valve; 107: First internal component of switching valve; 1071: First connecting shaft; 1072: First limiting end; 1073: First valve plate; 1074: Second connecting shaft; 1075: First radial flow section; 1076: First positioning ring; 108: Switch valve body; 109: Second internal component of switching valve; 1091: Third internal component of switching valve. Connecting shaft; 1092: Second limiting end; 1093: Second valve plate; 1094: Second radial flow section; 1095: Second positioning ring; 110: High-pressure chamber connector; 111: High-pressure fluid inlet; 112: First interface of pressure exchange cylinder; 113: Axial through cavity of switcher; 1131: First concave cavity of switcher; 1132: Intermediate cavity of switcher; 1133: Second concave cavity of switcher; 114: Pressure relief cavity; 115: Pressure relief fluid outlet; 116: Balance cavity;

[0056] 201: Pressurized fluid outlet; 202: Pressurized chamber housing; 203: First internal component of check valve; 204: Second interface of pressure exchange cylinder; 205: Axial through cavity of check valve; 2051: First recess of check valve; 2052: Intermediate cavity of check valve; 2053: Second recess of check valve; 206: Second internal component of check valve; 207: Low-pressure chamber connecting pipe; 208: Low-pressure fluid inlet; 209: Second bushing of check valve; 210: Check valve body; 211: First bushing of check valve; 212: Pressurized chamber; Detailed Implementation

[0057] To further understand the invention's content, features, and effects, the following embodiments are provided, along with detailed descriptions in conjunction with the accompanying drawings:

[0058] like Figure 1 As shown, the seawater desalination energy recovery tower provided by the present invention mainly includes three parts: a fluid switcher 1 at the brine end, a check valve group 2 at the seawater end, and a pressure exchange cylinder 3. The fluid switcher 1 at the brine end must be connected to an external drive mechanism to achieve reciprocating motion and complete the switching of the pressure increase and decrease process.

[0059] The pressure exchange cylinder 3 is arranged vertically, the fluid switcher 1 is located above the pressure exchange cylinder 3, and the check valve group 2 is located below the pressure exchange cylinder 3.

[0060] The fluid switch 1 at the brine end is fixedly connected to the brine end reducer 4 via the first reducer flange 6, and the brine end reducer 4 is fixedly connected to the pressure exchange cylinder 3 via the second reducer flange 7. The check valve assembly 2 at the seawater end is fixedly connected to the seawater end reducer 5 via the third reducer flange 8, and the seawater end reducer 5 is fixedly connected to the pressure exchange cylinder 3 via the fourth reducer flange 9.

[0061] like Figure 2 and Figure 3 As shown, the fluid switcher 1 mainly includes a switcher valve body 108, a first internal component of the switching valve 107, a second internal component of the switching valve 109, a pressure relief chamber housing 104, a drive shaft 101, a balance piston 102, a high-pressure chamber connection pipe 110, a balance pipe 105, and a flow regulating valve 106. The switcher valve body 108, the first internal component of the switching valve 107, the second internal component of the switching valve 109, the pressure relief chamber housing 104, the drive shaft 101, the balance piston 102, and the high-pressure chamber connection pipe 110 are all coaxially arranged.

[0062] like Figure 4 As shown, the switch valve body 108 is provided with a stepped cylindrical axially penetrating cavity 113. The axially penetrating cavity 113 extends axially along the switch valve body 108 and coincides with its central axis. It includes a switch intermediate cavity 1132 and a switch first recess 1131 and a switch second recess 1133 disposed at both ends of the switch intermediate cavity 1132. The inner diameters of the switch first recess 1131 and the switch second recess 1133 are both larger than the inner diameter of the switch intermediate cavity 1132. A chamfer is provided at the junction of the switch intermediate cavity 1132 with the switch first recess 1131 and the switch second recess 1133, thereby forming a conical structure.

[0063] The switch valve body 108 is provided with a pressure exchange cylinder first port 112 along its radial direction, and the pressure exchange cylinder first port 112 is connected to the switch intermediate cavity 1132. The pressure exchange cylinder first port 112 is generally located at the bottom of the switch valve body 108 and is used to connect the pressure exchange cylinder 3 through the brine end reducer 4.

[0064] The axially connected switching valve first inner component 107 and switching valve second inner component 109 are provided in the switching axial through cavity 113 of the switching valve body 108.

[0065] like Figure 5As shown, the first internal component 107 of the switching valve is integrally formed from a first connecting shaft 1071, a first limiting end 1072, a first valve plate 1073, a second connecting shaft 1074, a first radial flow portion 1075, and a first positioning ring 1076. The first connecting shaft 1071, the first valve plate 1073, and the second connecting shaft 1074 are coaxially connected in sequence. The end of the first connecting shaft 1071 is used for threaded connection with the drive shaft 101, and the end of the second connecting shaft 1074 is used for threaded connection with the third connecting shaft 1091. The first valve plate 1073 has a cylindrical structure and can slide within the intermediate cavity 1132 of the switcher. The first limiting end 1072 is coaxially provided on the side of the first valve plate 1073 facing the first connecting shaft 1071. The diameter of the first limiting end 1072 is larger than the inner diameter of the intermediate cavity 1132 of the switcher, and it can move within the first recess 1131 of the switcher. The stepped surface of the first limiting end 1072 is machined into an arc-shaped surface to form a line seal with the conical structure at the junction of the intermediate cavity 1132 and the first concave cavity 1131 of the switcher. Multiple sealing water lines are provided on the circumferential surface of the first valve plate 1073. These sealing water lines rotate around the circumferential surface of the first valve plate 1073, and their cross-section is rectangular or serrated. These sealing water lines form a circumferential seal with the intermediate cavity 1132 of the switcher. Thus, the first internal component 107 of the switching valve and the intermediate cavity 1132 of the switcher have both axial and circumferential seals, and this dual seal improves the sealing effect. A first radial flow portion 1075 and a first positioning ring 1076 are coaxially arranged on the side of the first valve plate 1073 facing the second connecting shaft 1074. The first radial flow portion 1075 is located between the first valve plate 1073 and the first positioning ring 1076. The first radial flow section 1075 includes multiple radial flow windows for fluid flow and ribs between the radial flow windows. The outer diameter of the ribs is the same as the outer diameter of the first valve plate 1073 and the first positioning ring 1076, ensuring smooth movement during switching. Thus, the first radial flow section 1075 has a dual function of flow and guidance. The outer diameter of the first positioning ring 1076 is the same as the diameter of the first valve plate 1073, ensuring that the first internal component 107 of the switching valve never disengages from the intermediate cavity 1132 of the switcher during switching, avoiding impact and jamming caused by the first valve plate 1073 entering and exiting the intermediate cavity 1132 of the switcher during switching.

[0066] like Figure 6As shown, the second internal component 109 of the switching valve is integrally formed from a third connecting shaft 1091, a second limiting end 1092, a second valve plate 1093, a second radial flow portion 1094, and a second positioning ring 1095. The second limiting end 1092, the second valve plate 1093, the second radial flow portion 1094, and the second positioning ring 1095 are symmetrically arranged with the first limiting end 1072, the first valve plate 1073, the first radial flow portion 1075, and the first positioning ring 1076, respectively. The third connecting shaft 1091 is coaxially connected to the second valve plate 1093, and the end of the third connecting shaft 1091 is threadedly connected to the second connecting shaft 1074. The second valve plate 1093 has a cylindrical structure and can slide within the intermediate cavity 1132 of the switcher. A second limiting end 1092 is coaxially disposed on the side of the second valve plate 1093 facing away from the third connecting shaft 1091. The second limiting end 1092 is larger than the diameter of the intermediate cavity 1132 of the switcher and can move within the second recess 1133 of the switcher. The stepped surface of the second limiting end 1092 is machined into an arc-shaped surface to form a line seal with the conical structure at the junction of the intermediate cavity 1132 and the second recess 1133 of the switcher. Multiple sealing water lines are disposed on the circumferential surface of the second valve plate 1093. The sealing water lines are arranged circumferentially along the circumferential surface of the second valve plate 1093, and their cross-section is rectangular or sawtooth groove, etc. The sealing water lines are used to form a circumferential seal with the intermediate cavity 1132 of the switcher.

[0067] Thus, the second inner part 109 of the switching valve and the intermediate cavity 1132 of the switcher have both axial and circumferential seals, and this dual seal improves the sealing effect. A second radial flow section 1094 and a second positioning ring 1095 are coaxially arranged on the side of the second valve plate 1093 facing the third connecting shaft 1091. The second radial flow section 1094 is located between the second valve plate 1093 and the second positioning ring 1095. The second radial flow section 1094 includes multiple radial flow windows for fluid flow and ribs between the radial flow windows. The outer diameter of the ribs is the same as the outer diameter of the second valve plate 1093 and the second positioning ring 1095, ensuring smooth movement during switching. Therefore, the second radial flow section 1094 has a dual function of flow and guidance. The outer diameter of the second positioning ring 1095 is the same as the diameter of the second valve plate 1093. It is used to ensure that the second internal component 109 of the switching valve does not leave the intermediate cavity 1132 of the switcher during the switching process, thus avoiding the impact and jamming caused by the second valve plate 1093 entering and exiting the intermediate cavity 1132 of the switcher during the switching process.

[0068] One end of the switch valve body 108 is connected to the pressure relief chamber housing 104, and the other end is connected to the high pressure chamber connecting pipe 110. Both the pressure relief chamber housing 104 and the high pressure chamber connecting pipe 110 are aligned with the central axis of the switch valve body 108.

[0069] The pressure relief chamber housing 104 is closed at one end and has its axial inner cavity extending through the other end. A drive shaft 101 is coaxially mounted within the axial inner cavity of the pressure relief chamber housing 104. One end of the drive shaft 101 passes through the closed end of the pressure relief chamber housing 104 and is used to connect to an external drive mechanism; the other end is threadedly connected to the first connecting shaft 1071. The connected drive shaft 101, the first internal component 107 of the switching valve, and the second internal component 109 of the switching valve constitute the only moving part of the fluid switcher 1. A balance piston 102 is mounted in the middle section of the drive shaft 101. One side of the balance piston 102 is limited by a shaft platform on the drive shaft 101, and the other side is fixed by a locking nut 103 mounted on the drive shaft 101. The balance piston 102 can slide within the axial inner cavity of the pressure relief chamber housing 104. A seal for static sealing is provided in the central hole of the balance piston 102, and a seal for dynamic sealing is provided on its outer circumferential surface. The balance piston 102 divides the axial inner cavity of the pressure relief chamber housing 104 into a balance chamber 116 and a pressure relief chamber 114, wherein the balance chamber 116 is located between the closed end of the pressure relief chamber housing 104 and the balance piston 102. The pressure relief chamber housing 104 is connected to the switch valve body 108 via a flange, so that the pressure relief chamber 114 is connected to the first recess 1131 of the switch.

[0070] The pressure relief chamber housing 104 is provided with a pressure relief fluid outlet 115 along its radial direction, and the pressure relief fluid outlet 115 radially penetrates the pressure relief chamber housing 104. The pressure relief fluid outlet 115 is connected to the pressure relief chamber 114, but is never connected to the balance chamber 116; that is, even when the balance piston 102 moves to the limit working position of the pressurized state, it will not be within the projection range of the pressure relief fluid outlet 115.

[0071] The switch valve body 108 and the pressure relief chamber housing 104 have flow holes at the same circumferential angle on their side walls. These two flow holes are connected to the balance chamber 116 and the second concave cavity 1133 of the switch, respectively. A balance pipe 105 connects the two flow holes, and a flow regulating valve 106 is installed on the balance pipe 105 to regulate the fluid flow within the balance chamber 116. The balance pipe 105 connects the second concave cavity 1133 of the switch and the balance chamber 116, introducing high-pressure fluid into the balance chamber 116. This high-pressure fluid acts on the side of the balance piston 102 facing the balance chamber 116, applying a pressure difference to the first internal component 107 and the second internal component 109 of the switching valve via the drive shaft 101. This balances the pressure difference during the opening process of the first internal component 107 and the second internal component 109 of the switching valve, ultimately canceling out the two large pressure differences and significantly reducing drive energy consumption.

[0072] The high-pressure chamber connector 110 is provided with a high-pressure fluid inlet 111, which extends axially along the high-pressure chamber connector 110 and coincides with its central axis. The high-pressure chamber connector 110 is connected to the switch valve body 108 via a flange, so that the high-pressure fluid inlet 111 is connected to the second cavity 1133 of the switch.

[0073] like Figure 7 and Figure 8 As shown, the check valve assembly 2 includes a check valve body 210, a pressure chamber housing 202, a low-pressure chamber connecting pipe 207, a first check valve bushing 211, a second check valve bushing 209, a first check valve inner component 203, and a second check valve inner component 206, and all of the above components are coaxially arranged.

[0074] like Figure 9 As shown, the check valve body 210 is provided with a stepped cylindrical axial through cavity 205. The axial through cavity 205 extends axially along the check valve body 210 and coincides with its central axis. It includes a check valve intermediate cavity 2052 and a check valve first recess 2051 and a check valve second recess 2053 disposed at both ends of the check valve intermediate cavity 2052. The inner diameters of the check valve first recess 2051 and the check valve second recess 2053 are both larger than the inner diameter of the check valve intermediate cavity 2052.

[0075] The check valve body 210 has a pressure exchange cylinder second port 204 arranged radially thereon, which is connected to the intermediate cavity 2052 of the check valve. The pressure exchange cylinder second port 204 is generally located at the top of the check valve body 210 and is used to connect the pressure exchange cylinder 3 through the seawater end reducer 5.

[0076] One end of the check valve body 210 is connected to the pressurization chamber housing 202, and the other end is connected to the low-pressure chamber pipe 207.

[0077] The booster chamber housing 202 contains a booster chamber 212, which is axially aligned with its central axis. One end of the booster chamber housing 202 has a booster fluid outlet 201, which is radially aligned with the housing and extends through both ends, allowing the booster fluid from the booster chamber 212 to flow out of the check valve assembly. The other end of the booster chamber housing 202 is connected to the check valve body 210 via a flange, connecting the booster chamber 212 to the first recess 2051 of the check valve.

[0078] The low-pressure chamber connector 207 is provided with a low-pressure fluid inlet 208, which extends axially through the low-pressure chamber connector 207 and coincides with its central axis. The low-pressure chamber connector 207 is connected to the check valve body 210 via a flange, allowing the low-pressure fluid inlet 208 to communicate with the second recess 2053 of the check valve. Low-pressure fluid flows into the second recess 2053 of the check valve from the low-pressure fluid inlet 208.

[0079] The first sleeve 211 of the check valve is located at the junction of the pressurization chamber housing 202 and the check valve body 210, and is fixed to the end face of the pressurization chamber housing 202 by circumferentially distributed fastening bolts. The second sleeve 209 of the check valve is located at the junction of the check valve intermediate cavity 2052 and the check valve second recess 2053 of the check valve body 210, and is fixed to the stepped surface of the two by circumferentially distributed fastening bolts.

[0080] like Figure 10 As shown, the first sleeve 211 and the second sleeve 209 of the check valve have the same structure, both including a fixed ring and a central ring arranged in concentric circles. The central ring and the fixed ring are connected by radially evenly distributed connecting parts. The fixed ring has bolt holes evenly distributed around its circumference for installing fastening bolts.

[0081] The first internal component 203 of the check valve is installed in conjunction with the first bushing 211 of the check valve, and the second internal component 206 of the check valve is installed in conjunction with the second bushing 209 of the check valve. The first internal component 203 and the second internal component 206 of the check valve are installed in the same direction. The first internal component 203 and the second internal component 206 of the check valve have the same structure, both including a central shaft, a valve plate, and a spring; the valve plate is located at one end of the central shaft and is integrally formed with the central shaft, and the spring is sleeved outside the central shaft.

[0082] The central axis of the first inner component 203 of the check valve passes through the central ring of the first sleeve 211 of the check valve and can slide relative to it. The valve plate of the first inner component 203 of the check valve moves within the first cavity 2051 of the check valve, and its diameter is larger than the inner diameter of the intermediate cavity 2052 of the check valve. The spring of the first inner component 203 of the check valve is located between the central ring of the first sleeve 211 of the check valve and the valve plate of the first inner component 203 of the check valve.

[0083] The central axis of the second inner component 206 of the check valve passes through the central ring of the second sleeve 209 of the check valve and is capable of relative sliding. The valve plate of the second inner component 206 of the check valve moves within the second cavity 2053 of the check valve, and its diameter is larger than the inner diameter of the low-pressure fluid inlet 208. The spring of the second inner component 206 of the check valve is located between the central ring of the second sleeve 209 of the check valve and the valve plate of the second inner component 206 of the check valve.

[0084] like Figure 11 and Figure 12As shown in Figure ac, the present invention also provides a seawater desalination energy recovery tower array structure, comprising one or more basic seawater desalination energy recovery tower units arranged side by side. Each basic seawater desalination energy recovery tower unit includes two seawater desalination energy recovery towers, with fluid switchers 1 and check valve groups 2 symmetrically arranged in the two towers. Specifically, the high-pressure fluid inlets 111 of the fluid switchers 1 in the two towers face each other, and the low-pressure fluid inlets 208 of the check valve groups 2 in the two towers face each other. Generally, the two seawater desalination energy recovery towers in the basic unit are fixed by a base and a support.

[0085] In the fluid switcher 1 of the two seawater desalination energy recovery towers, the high-pressure fluid inlet 111 is directly connected to the same high-pressure brine header 10, and the pressure relief fluid outlet 115 is directly connected to two pressure relief brine headers 11 respectively. The axes of the high-pressure brine header 10 and the pressure relief brine header 11 are perpendicular to the axis of both the fluid switcher 1 and the pressure exchange cylinder 3.

[0086] In the check valve assembly 2 of the two seawater desalination energy recovery towers, the low-pressure fluid inlet 208 is directly connected to the same low-pressure seawater header 12, and the pressurized fluid outlet 201 is directly connected to two pressurized seawater headers 13 respectively. The axial directions of the low-pressure seawater header 12 and the pressurized seawater header 13 are perpendicular to both the axial direction of the check valve assembly 2 and the axial direction of the pressure exchange cylinder 3.

[0087] In this way, the seawater desalination energy recovery tower array structure can achieve continuous and stable operation of the system pressure exchange process. By arranging the basic units of the seawater desalination energy recovery tower in an array along the axial direction of the main pipe, the system's processing capacity can be increased or expanded.

[0088] The working process of the seawater desalination energy recovery tower of the present invention is as follows:

[0089] like Figure 2 As shown, the fluid switch 1 at the brine end is in the pressurization working position, the second internal component 109 of the switching valve is in the fully open state, the first internal component 107 of the switching valve is in the fully closed state, the second cavity 1133 of the switch is connected to the intermediate cavity 1132 of the switch, and the first cavity 1131 of the switch is disconnected from the intermediate cavity 1132 of the switch. By adjusting the opening of the flow regulating valve 106, the balance chamber 116 is filled with high-pressure fluid. At this time, the high-pressure brine in the high-pressure brine header 10 flows through the high-pressure fluid inlet 111 in sequence through the first cavity 1131 and the intermediate cavity 1132 of the switch, and flows into the pressure exchange cylinder 3 through the first port 112 of the pressure exchange cylinder, pressurizing the low-pressure seawater pre-filled in the pressure exchange cylinder 3, and discharging it from the check valve group 2 at the seawater end.

[0090] like Figure 7As shown, the check valve assembly 2 at the seawater end passively responds to the fluid switch 1 at the brine end and is in the pressurized working position. The first internal component 203 of the check valve is in the fully open state, the spring of the first internal component 203 of the check valve is in the maximum compression state, the second internal component 206 of the check valve is in the fully closed state, the spring of the second internal component 206 of the check valve is in the minimum compression state, the first cavity 2051 of the check valve is connected to the intermediate cavity 2052 of the check valve, and the second cavity 2053 of the check valve is disconnected from the low-pressure fluid inlet 208. At this time, the pressurized seawater in the pressure exchange cylinder 3 flows through the second port 204 of the pressure exchange cylinder in sequence through the intermediate cavity 2052 of the check valve, the first cavity 2051 of the check valve, and the pressurized cavity 212, and flows into the pressurized seawater header 13 through the pressurized fluid outlet 201. The above is the pressurization process carried out by the seawater desalination energy recovery tower.

[0091] After the pressurization process ends, the external drive mechanism, via drive shaft 101, switches the central moving component of the fluid switcher in a direction gradually moving away from the high-pressure fluid inlet 111. During the switching process, the second inner component 109 of the switching valve gradually closes. At the instant or after disconnecting the connection between the second cavity 1133 and the intermediate cavity 1132 of the switcher, the first inner component 107 of the switching valve gradually opens until it is fully open. Simultaneously, the check valve assembly passively responds to this switching process, and the entire device switches to the pressure relief operating position. During this switching process, the high-pressure fluid in the balance chamber 116 flows to the second cavity 1133 of the switcher through the balance pipe 105 and the flow regulating valve 106, which has a damping effect, making the switching process of the external drive mechanism smoother.

[0092] like Figure 8 As shown, the valve plate position of the check valve group corresponding to the pressure relief working position of the fluid switch is shown. The second inner part 206 of the check valve is in the fully open state, and the spring of the second inner part 206 of the check valve is in the maximum compression state. The first inner part 203 of the check valve is in the fully closed state, and the spring of the first inner part 203 of the check valve is in the minimum compression state. The second cavity 2053 of the check valve is connected to the low-pressure fluid inlet 208, and the first cavity 2051 of the check valve is disconnected from the intermediate cavity 2052 of the check valve. At this time, the low-pressure seawater in the low-pressure seawater header 12 flows through the low-pressure fluid inlet 208, sequentially through the second cavity 2053 and the intermediate cavity 2052 of the check valve, and flows into the pressure exchange cylinder 3 through the second port 204 of the pressure exchange cylinder, depressurizing the high-pressure brine filled in the pressure exchange cylinder 3 in the previous pressurization process, and discharging it from the fluid switch 1 at the brine end.

[0093] like Figure 3As shown, the first internal component 107 of the switching valve is in a fully open state, the second internal component 109 of the switching valve is in a fully closed state, the first cavity 1131 of the switcher is connected to the intermediate cavity 1132 of the switcher, and the second cavity 1133 of the switcher is disconnected from the intermediate cavity 1132 of the switcher. By adjusting the opening of the flow regulating valve 106, the balance chamber 116 is filled with high-pressure fluid. At this time, the depressurized brine in the pressure exchange cylinder 3 flows through the first port 112 of the pressure exchange cylinder in sequence through the intermediate cavity 1132 of the switcher, the first cavity 1131 of the switcher, and the pressure relief chamber 114, and flows into the depressurized brine header 11 through the pressure relief fluid outlet 115. The above is the depressurization process carried out by the seawater desalination energy recovery tower. After the depressurization process is completed, the external drive mechanism uses the drive shaft 101 to switch the central moving part of the fluid switcher towards the high-pressure fluid inlet 111. During the switching process, the first inner part 107 of the switching valve gradually closes. At the moment or after the connection between the first cavity 1131 and the intermediate cavity 1132 of the switcher is disconnected, the second inner part 109 of the switching valve gradually opens until it is fully open. At the same time, the check valve group passively responds to the switching process, and the entire device switches to the pressurization working position.

[0094] After the repeated switching between the pressurization and depressurization processes described above, one pressurization / depressurization cycle ends, and the next pressurization / depressurization cycle begins, completing the alternation of pressurization and depressurization processes in the seawater desalination energy recovery tower.

[0095] The seawater desalination energy recovery tower array structure consists of two seawater desalination energy recovery towers arranged side by side, such as... Figure 12 In section b, inlets 1# and 2# are directly connected to the high-pressure brine header 10 (high-pressure fluid inlet 111) and the low-pressure seawater header 12 (low-pressure fluid inlet 208), forming the basic unit of the energy recovery system. This enables continuous and stable operation of the system's pressure exchange process. Arranging the basic units of the seawater desalination energy recovery tower in an array along the axial direction of the header allows for expansion of the system's processing capacity.

[0096] Specifically, such as Figure 11 This is a schematic diagram of a 2*3 multi-cylinder array scheme. Figure 12 a, 12b, and 12c are respectively Figure 11 The array scheme includes a front view, top view, and side view. The six cylinders in parallel are numbered 1#, 2#, 3#, 4#, 5#, and 6#. By controlling the external drive mechanism of each seawater desalination energy recovery tower, cylinders 1#, 3#, and 5# can simultaneously perform pressurization or depressurization processes, while cylinders 2#, 4#, and 6# can simultaneously perform the opposite process to the three cylinders mentioned above, thereby achieving continuous and stable operation of the pressure exchange process.

[0097] 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 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 the present invention without departing from the spirit and scope of the claims, and these modifications all fall within the scope of protection of the present invention.

Claims

1. A fluid switcher, characterized in that, Includes a switch valve body, one end of which is coaxially connected to the pressure relief chamber housing, and the other end is coaxially connected to the high pressure chamber pipe; The switch valve body has a coaxially arranged axial through cavity, which includes a switch intermediate cavity and a switch first concave cavity and a switch second concave cavity at both ends. The inner diameter of the switch first concave cavity and the switch second concave cavity are both larger than the inner diameter of the switch intermediate cavity. The junction of the switch intermediate cavity with the switch first concave cavity and the switch second concave cavity is respectively provided with a chamfer, thereby forming a conical structure. The switch valve body is provided with a pressure exchange cylinder first interface along its radial direction. The pressure exchange cylinder first interface is connected to the intermediate cavity of the switch and is used to connect the pressure exchange cylinder. The axial through cavity of the switcher is equipped with a first internal component of the switching valve and a second internal component of the switching valve, both of which are integrally formed structures. The first internal component of the switching valve includes a first connecting shaft, a first valve plate, and a second connecting shaft connected coaxially in sequence. The first valve plate is slidable within the intermediate cavity of the switcher. A first limiting end is coaxially provided on the side of the first valve plate facing the first connecting shaft, and the diameter of the first limiting end is larger than the inner diameter of the intermediate cavity of the switcher. The stepped surface of the first limiting end is machined into an arc-shaped surface to form a line seal with the conical structure at the junction of the intermediate cavity of the switcher and the first concave cavity of the switcher. Multiple sealing water lines are provided on the circumferential surface of the first valve plate to form a circumferential seal with the intermediate cavity of the switcher. A first radial flow portion and a first positioning ring are coaxially provided on the side of the first valve plate facing the second connecting shaft. The first radial flow portion is located between the first valve plate and the first positioning ring. The first positioning ring ensures that the first internal component of the switching valve never detaches from the intermediate cavity of the switcher during the switching process. The second internal component of the switching valve is integrally formed from a third connecting shaft, a second limiting end, a second valve plate, a second radial flow portion, and a second positioning ring. The third connecting shaft is coaxially connected to the second valve plate and threadedly connected to the second connecting shaft. The second valve plate, the second limiting end, the second radial flow portion, and the second positioning ring have the same structure as the first valve plate, the first limiting end, the first radial flow portion, and the first positioning ring, and are symmetrically arranged. The stepped surface of the second limiting end is machined into an arc-shaped surface to form a line seal with the conical surface structure at the junction of the intermediate cavity of the switcher and the second concave cavity of the switcher. The circumferential surface of the second valve plate is provided with multiple sealing water lines to form a circumferential seal with the intermediate cavity of the switcher. The pressure relief chamber housing is closed at one end and has its axial inner cavity extending through the other end; a drive shaft is coaxially arranged in the axial inner cavity, one end of which passes through the closed end of the pressure relief chamber housing and is used to connect to an external drive mechanism; the other end is threadedly connected to the first connecting shaft. The drive shaft is equipped with a balance piston, which can slide within the axial inner cavity. The balance piston divides the axial inner cavity into a balance cavity and a pressure relief cavity, wherein the balance cavity is located between the closed end of the pressure relief cavity housing and the balance piston. The pressure relief cavity housing is connected to the switch valve body via a flange, allowing the pressure relief cavity to communicate with the first recess of the switch. The pressure relief cavity housing has a through pressure relief fluid outlet along its radial direction, which communicates with the pressure relief cavity but is never connected to the balance cavity. The high-pressure chamber connector is provided with an axially penetrating high-pressure fluid inlet; the high-pressure chamber connector is connected to the switch valve body via a flange, so that the high-pressure fluid inlet is connected to the second cavity of the switch. The sidewall of the switch valve body and the sidewall of the pressure relief chamber housing are respectively provided with flow holes at the same circumferential angle. The two flow holes are respectively connected to the balance chamber and the second cavity of the switch. The two flow holes are connected by a balance pipe. The balance pipe is provided with a flow regulating valve. The flow regulating valve is used to introduce high-pressure fluid into the balance chamber, so as to apply a pressure difference force to the first internal component and the second internal component of the switch valve through the drive shaft, so as to balance the pressure difference force during the opening process of the first internal component and the second internal component of the switch valve.

2. A fluid switcher according to claim 1, characterized in that, The first radial flow section includes a plurality of radial flow windows for fluid flow and ribs between the radial flow windows, wherein the outer diameter of the ribs is the same as the outer diameter of the first valve plate and the first positioning ring; The second radial flow section includes a plurality of radial flow windows for fluid flow and ribs between the radial flow windows, wherein the outer diameter of the ribs is the same as the outer diameter of the second valve plate and the second positioning ring.

3. A fluid switcher according to claim 1, characterized in that, One side of the balance piston is limited by the shaft plate on the drive shaft, and the other side is fixed by the locking nut installed on the drive shaft.

4. A fluid switcher according to claim 1, characterized in that, The central hole of the balance piston is provided with a seal for static sealing, and the outer circumferential surface is provided with a seal for dynamic sealing.

5. A fluid switcher according to claim 1, characterized in that, The drive shaft, the balance piston, the first internal component of the switching valve, and the second internal component of the switching valve are all coaxially arranged.

6. A seawater desalination energy recovery tower, characterized in that, It includes a vertically arranged pressure exchange cylinder, the upper part of which is connected to a fluid switch as described in any one of claims 1-5, the fluid switch serving as the brine end; and the lower part of which is connected to a check valve assembly serving as the seawater end. The fluid switcher is connected to the pressure exchange cylinder through the first interface of the pressure exchange cylinder, and the check valve assembly is connected to the pressure exchange cylinder through the second interface of the pressure exchange cylinder.

7. A seawater desalination energy recovery tower according to claim 6, characterized in that, The check valve assembly includes a check valve body, one end of which is coaxially connected to a pressurization chamber housing, and the other end is coaxially connected to a low-pressure chamber connector. The check valve body has a coaxially arranged check valve axial through cavity inside, which includes a check valve intermediate cavity and a check valve first recess and a check valve second recess at both ends; the inner diameter of the check valve first recess and the check valve second recess are both larger than the inner diameter of the check valve intermediate cavity. The check valve body is provided with the second port of the pressure exchange cylinder along its radial direction, and the second port of the pressure exchange cylinder is connected to the intermediate cavity of the check valve. The pressure chamber housing is coaxially arranged inside the pressure chamber housing. One end of the pressure chamber housing is radially provided with a pressure fluid outlet. The other end of the pressure chamber housing is connected to the check valve body through a flange, so that the pressure chamber is connected to the first cavity of the check valve. The low-pressure chamber connector is coaxially provided with a low-pressure fluid inlet. The low-pressure chamber connector is connected to the check valve body through a flange, so that the low-pressure fluid inlet is connected to the second cavity of the check valve. A first sleeve of the check valve is fixed at the junction of the pressurization chamber housing and the check valve body, and a second sleeve of the check valve is fixed at the junction of the intermediate cavity of the check valve and the second concave cavity of the check valve; a first inner component of the check valve and a second inner component of the check valve are respectively installed on the first sleeve and the second sleeve; the first sleeve, the second sleeve, the first inner component, and the second inner component of the check valve are all coaxially arranged with the check valve body; The first and second internal components of the check valve have the same structure and installation direction, each including a central shaft and a valve plate integrally connected to one end of the central shaft. A spring is fitted outside the central shaft. The central shaft of the first internal component passes through the first sleeve of the check valve and can slide relative to it. The valve plate of the first internal component moves within the first cavity of the check valve and its diameter is larger than the inner diameter of the intermediate cavity of the check valve. The spring of the first internal component is located between its valve plate and the first sleeve of the check valve. The central shaft of the second internal component passes through the second sleeve of the check valve and can slide relative to it. The valve plate of the second internal component moves within the second cavity of the check valve and its diameter is larger than the inner diameter of the low-pressure fluid inlet. The spring of the second internal component is located between its valve plate and the second sleeve of the check valve.

8. A seawater desalination energy recovery tower according to claim 7, characterized in that, The first and second bushings of the check valve have the same structure, both including a fixed ring and a central ring arranged in concentric circles. The central ring and the fixed ring are connected by radially evenly distributed connecting parts. The fixed ring is used to fix the first and second bushings of the check valve, and the central ring is used to install the first and second internal components of the check valve.

9. A seawater desalination energy recovery tower array structure, characterized in that, It includes one or more basic units of seawater desalination energy recovery towers arranged side by side, each basic unit of seawater desalination energy recovery towers including two seawater desalination energy recovery towers as described in any one of claims 6-8; the fluid switchers and check valve groups in the two seawater desalination energy recovery towers in each basic unit of seawater desalination energy recovery towers are symmetrically arranged.

10. The seawater desalination energy recovery tower array structure according to claim 9, characterized in that, In each of the basic units of the seawater desalination energy recovery tower, the high-pressure fluid inlet direction in the fluid switch of the two seawater desalination energy recovery towers is opposite to that of the low-pressure fluid inlet direction in the check valve group; In the fluid switchers of the two seawater desalination energy recovery towers, the high-pressure fluid inlet is directly connected to the same high-pressure brine header, and the pressure relief fluid outlet is directly connected to two pressure relief brine headers respectively. The low-pressure fluid inlet of the check valve assembly in the two seawater desalination energy recovery towers is directly connected to the same low-pressure seawater header, and the pressurized fluid outlet is directly connected to two pressurized seawater headers respectively.

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