Hydraulic switching valve group for energy recovery device and working method

Abstract

The invention relates to the technical field of seawater desalination equipment, and discloses a hydraulic switching valve group for an energy recovery device and a working method.The hydraulic switching valve group comprises a switching valve group body, and a high-pressure seawater one-way valve and a low-pressure seawater one-way valve are arranged on the outer wall of the switching valve group body; the switching valve group body comprises an outer shell, a pressurizing piston is slidably connected to the inner wall of the outer shell, a piston cover is installed on the outer wall of the pressurizing piston, a round rod is installed on the inner wall of the pressurizing piston, and a reciprocating lead screw is installed at the end, away from the pressurizing piston, of the round rod. High-pressure strong brine drives the impeller to rotate to drive the reciprocating lead screw and the pressurizing piston to move, pressure energy and kinetic energy of the high-pressure strong brine are directly converted into linear reciprocating motion of the pressurizing piston, pressurizing of low-pressure seawater is achieved, the energy transfer path is short, and loss is low; efficiency loss caused by multiple energy form conversion in a traditional energy recovery device is avoided, the structure is simple, no complex electric control part exists, the equipment manufacturing cost and the maintenance cost are low, and meanwhile the power requirement of the high-pressure pump is reduced.

Description

Technical Field

[0001] This invention relates to the field of seawater desalination equipment technology, specifically to a hydraulic switching valve assembly and its operating method for an energy recovery device. Background Technology

[0002] In fields such as seawater desalination and industrial wastewater treatment, membrane separation technologies such as reverse osmosis are often used to purify and reuse water resources. During the operation of such systems, a large amount of high-pressure concentrated brine is generated after membrane separation. Directly discharging this high-pressure concentrated brine would not only result in a huge waste of pressure energy, but could also cause environmental problems such as shock and noise due to the direct discharge of high-pressure fluid. At the same time, the system front end needs to continuously input high-pressure feed water into the membrane module, which consumes a lot of electricity to drive the high-pressure pump, resulting in high energy consumption and high operating costs for the entire system.

[0003] Existing switching valve assemblies convert the pressure energy of high-pressure concentrated brine into electrical energy through a generator, and then use an electric motor to drive a pressurizing mechanism to pressurize low-pressure water. This multiple energy conversions result in significant energy loss, leading to generally low overall recovery efficiency. Therefore, developing a hydraulic switching valve assembly with high energy conversion efficiency is of great practical significance. Summary of the Invention

[0004] This invention provides a hydraulic switching valve assembly and its operating method for an energy recovery device, which solves the problems mentioned in the background art.

[0005] The present invention provides the following technical solution: a hydraulic switching valve group for an energy recovery device, comprising a switching valve group body, wherein a high-pressure seawater check valve and a low-pressure seawater check valve are provided on the outer wall of the switching valve group body; The switching valve assembly body includes an outer shell. A pressure piston is slidably connected to the inner wall of the outer shell. A piston cover is installed on the outer wall of the pressure piston. A round rod is installed on the inner wall of the pressure piston. A reciprocating screw is installed at the end of the round rod away from the pressure piston. A slider is threadedly connected to the outer edge of the reciprocating screw. An impeller is installed on the outer wall of the slider. A power housing is installed on the outer wall of the outer shell. The impeller is located in the power housing. A high-pressure concentrated brine inlet pipe is installed on the outer wall of the power housing. A protective shell is installed at the end of the power housing away from the outer shell. A low-pressure concentrated brine outlet pipe is installed on the outer wall of the protective shell. A sealing plate is installed at the end of the outer shell away from the power housing. A high-pressure seawater outlet pipe and a low-pressure seawater inlet pipe are installed on the outer wall of the sealing plate.

[0006] As a preferred embodiment of the present invention, the inner wall of the pressurizing piston is provided with a circular hole, the circular rod is located in the circular hole, the outer wall of the circular rod is provided with a circular groove, and a retaining spring is installed on the inner wall of the circular groove.

[0007] As a preferred embodiment of the present invention, a limiting groove is formed on the inner wall of the circular hole, and a protrusion is installed on the outer wall of the circular rod. The protrusion is located in the limiting groove. Two sets of circular grooves and retaining springs are provided, and the two circular grooves and two retaining springs are respectively located on both sides of the protrusion.

[0008] As a preferred embodiment of the present invention, a fan wheel is installed at the end of the impeller away from the pressurizing piston, and the fan wheel is located in the protective housing.

[0009] As a preferred embodiment of the present invention, an installation pipe is installed on the outer wall of the low-pressure concentrated brine discharge pipe, a tail sealing ring is installed on the inner wall of the installation pipe, a sealing rod is slidably connected to the inner wall of the tail sealing ring, and a reversing plate is installed on the end of the sealing rod near the reciprocating screw, and the reversing plate is installed on the reciprocating screw.

[0010] As a preferred embodiment of the present invention, a limiting rod is installed on the inner wall of the outer shell, and a limiting block is slidably connected to the outer edge of the limiting rod, and the limiting block is installed on the pressurizing piston.

[0011] As a preferred embodiment of the present invention, an extension cylinder is installed at the end of the power housing away from the protective housing, and a central sealing ring is installed at the end of the extension cylinder away from the power housing. The round rod is slidably connected to the central sealing ring and the extension cylinder.

[0012] As a preferred embodiment of the present invention, the outer wall of the power housing is provided with an observation groove, and the inner wall of the observation groove is fitted with a sealing glass.

[0013] As a preferred embodiment of the present invention, a high-pressure seawater check valve is installed at the end of the high-pressure seawater discharge pipe away from the outer casing, and a low-pressure seawater check valve is installed at the end of the low-pressure seawater inlet pipe away from the outer casing.

[0014] The operating method of the hydraulic switching valve assembly for the energy recovery device includes the following steps: S1: High-pressure concentrated brine enters the power housing through the high-pressure concentrated brine inlet pipe. The flow of high-pressure concentrated brine drives the impeller and slider in the power housing to rotate. S2: When the impeller and slider rotate, they drive the reciprocating screw, sealing rod, round rod, pressure piston and piston cover to move towards the sealing plate in the outer shell. The pressure piston and piston cover squeeze the low-pressure seawater in the outer shell, and the low-pressure seawater is discharged through the high-pressure seawater discharge pipe and the high-pressure seawater check valve. S3: The continuous input of high-pressure concentrated brine will drive the impeller and slider to rotate continuously. When the pressurizing piston contacts the limit rod, the reciprocating screw, sealing rod, round rod, pressurizing piston and piston cover move in the opposite direction to the sealing plate in the outer shell. S4: Low-pressure seawater is pumped into the outer shell through the pressurizing piston and piston cover, so that the outer shell contains low-pressure seawater that needs to be pressurized.

[0015] The present invention has the following beneficial effects: 1. The hydraulic switching valve assembly and its working method for the energy recovery device drive the impeller to rotate through high-pressure concentrated brine, which in turn drives the reciprocating screw and the pressurizing piston to move. The pressure energy and kinetic energy of the high-pressure concentrated brine are directly converted into the linear reciprocating motion of the pressurizing piston, thereby pressurizing the low-pressure seawater. The energy transmission path is short and the loss is low, avoiding the efficiency loss of multiple energy form conversions in traditional energy recovery devices. The structure is simple, without complex electrical control components, and the equipment manufacturing and maintenance costs are low. At the same time, it reduces the power requirement of the high-pressure pump.

[0016] 2. The hydraulic switching valve assembly and its working method used in the energy recovery device achieve initial decompression when the impeller is driven to rotate by high-pressure concentrated brine. At the same time, its pressure energy can be completely transferred to low-pressure seawater, so that the low-pressure seawater is pressurized into high-pressure seawater, realizing dual use of one energy. It can both depressurize the high-pressure concentrated brine and pressurize the low-pressure seawater, thus greatly improving the energy utilization rate.

[0017] 3. The hydraulic switching valve assembly and its working method for the energy recovery device can drive the reciprocating screw and pressurizing piston through the continuous rotation of the impeller and slider as long as there is high-pressure concentrated brine input. This allows the pressurizing piston to automatically perform reciprocating squeezing and extraction actions without the need for an additional power source, achieving continuous and stable energy recovery and conversion. It is suitable for industrial continuous production scenarios, improving energy utilization and reducing fossil energy consumption and carbon emissions. Attached Figure Description

[0018] Figure 1 This is a frontal perspective view of the present invention; Figure 2 This is a three-dimensional structural diagram of the back of the present invention; Figure 3 This is a schematic diagram of the seawater extraction profile structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the diagram; Figure 5 This is a schematic diagram of the pressurized seawater cross-sectional structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B in the diagram; Figure 7 This is a schematic diagram of the power housing structure of the present invention; Figure 8 This is a schematic diagram of the unfolded structure of the switching valve assembly body of the present invention; Figure 9This is a schematic diagram of the connection structure between the pressurizing piston and the round rod of the present invention.

[0019] In the diagram: 1. Switching valve assembly body; 2. High-pressure seawater check valve; 3. Low-pressure seawater check valve; 101. Outer shell; 102. Pressurized piston; 103. Piston cover; 104. Circular hole; 105. Limiting groove; 106. Circular rod; 107. Protrusion; 108. Circular groove; 109. Snap ring; 110. Reciprocating screw; 111. Reversing plate; 112. Sealing rod; 113. Power housing; 114. High-pressure concentrated brine inlet pipe; 115. Protective shell; 116. Low-pressure concentrated brine outlet pipe; 117. Mounting pipe; 118. Tail sealing ring; 119. Slider; 120. Impeller; 121. Fan wheel; 122. Extension cylinder; 123. Middle sealing ring; 124. Limiting block; 125. Limiting rod; 126. Sealing plate; 127. High-pressure seawater outlet pipe; 128. Low-pressure seawater inlet pipe; 129. Observation slot; 130. Sealing glass. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-9 A hydraulic switching valve assembly for an energy recovery device includes a switching valve assembly body 1, and a high-pressure seawater check valve 2 and a low-pressure seawater check valve 3 are provided on the outer wall of the switching valve assembly body 1. The switching valve assembly body 1 includes an outer shell 101. A pressure piston 102 is slidably connected to the inner wall of the outer shell 101. A piston cover 103 is installed on the outer wall of the pressure piston 102. A round rod 106 is installed on the inner wall of the pressure piston 102. A reciprocating screw 110 is installed at the end of the round rod 106 away from the pressure piston 102. A slider 119 is threadedly connected to the outer edge of the reciprocating screw 110. An impeller 120 is installed on the outer wall of the slider 119. A power housing is installed on the outer wall of the outer shell 101. 113. The impeller 120 is located in the power housing 113. A high-pressure concentrated brine inlet pipe 114 is installed on the outer wall of the power housing 113. A protective shell 115 is installed at the end of the power housing 113 away from the outer shell 101. A low-pressure concentrated brine outlet pipe 116 is installed on the outer wall of the protective shell 115. A sealing plate 126 is installed at the end of the outer shell 101 away from the power housing 113. A high-pressure seawater outlet pipe 127 and a low-pressure seawater inlet pipe 128 are installed on the outer wall of the sealing plate 126.

[0022] In the above structure, high-pressure concentrated brine enters the power housing 113 through the high-pressure concentrated brine inlet pipe 114. The flow of the high-pressure concentrated brine drives the impeller 120 in the power housing 113 to rotate. The rotation of the impeller 120 drives the slider 119 to rotate. The rotation of the slider 119 drives the reciprocating screw 110, the round rod 106, the piston cover 103, and the pressurizing piston 102 to move, causing them to move towards the sealing plate 126. Seawater in the outer casing 101 is forced out by the pressurizing piston 102 and the piston cover 103 through the high-pressure seawater discharge pipe 127, thus pressurizing the seawater in the outer casing 101. The continuous rotation of impeller 120 and slider 119 causes reciprocating screw 110, round rod 106, piston cover 103 and pressurizing piston 102 to move in the opposite direction to sealing plate 126, so that pressurizing piston 102 and piston cover 103 can draw seawater into outer shell 101 through low-pressure seawater inlet pipe 128. At this time, seawater is drawn into outer shell 101. The continuous rotation of impeller 120 and slider 119 will repeatedly squeeze and draw seawater, so that the pressure of high-pressure concentrated brine can be utilized. The high-pressure concentrated brine driving impeller 120 to rotate can also relieve the pressure of high-pressure concentrated brine, so that the pressure of high-pressure concentrated brine passing through impeller 120 is lower than that of high-pressure concentrated brine not passing through impeller 120.

[0023] In a preferred embodiment: the inner wall of the pressurizing piston 102 is provided with a circular hole 104, the circular rod 106 is located in the circular hole 104, the outer wall of the circular rod 106 is provided with a circular groove 108, and a retaining ring 109 is installed on the inner wall of the circular groove 108.

[0024] In the above structure, by installing the round rod 106 in the round hole 104 and then installing the snap ring 109 on the round rod 106, the round rod 106 can move the pressure piston 102 and the piston cover 103 when it moves, and it is also convenient to separate the pressure piston 102 and the round rod 106 during maintenance.

[0025] In a preferred embodiment: a limiting groove 105 is formed on the inner wall of the circular hole 104, and a protrusion 107 is installed on the outer wall of the circular rod 106. The protrusion 107 is located in the limiting groove 105. Two sets of circular grooves 108 and retaining rings 109 are provided, and the two circular grooves 108 and the two retaining rings 109 are respectively located on both sides of the protrusion 107.

[0026] In the above structure, the limiting groove 105 and the protrusion 107 are provided to prevent the round rod 106 from rotating. This prevents the impeller 120 and the slider 119 from rotating and thus preventing them from driving the round rod 106, the reciprocating screw 110, the reversing plate 111, and the sealing rod 112 to rotate, thereby improving the stability and rationality of the device operation. By providing two retaining rings 109, the round rod 106 can move forward or backward to drive the pressure piston 102.

[0027] In a preferred embodiment, a fan wheel 121 is mounted on the end of the impeller 120 away from the pressurizing piston 102, and the fan wheel 121 is located in the protective housing 115.

[0028] In the above structure, by setting the fan wheel 121, the high-pressure concentrated brine drives the impeller 120 and the slider 119 to rotate after passing through the impeller 120, resulting in the first pressure reduction. When the high-pressure concentrated brine passes through the fan wheel 121 after being depressurized, it can improve the stability of the impeller 120 rotation. At the same time, the high-pressure concentrated brine undergoes a second pressure reduction process, so that the high-pressure concentrated brine can be fully depressurized.

[0029] In a preferred embodiment: an installation pipe 117 is installed on the outer wall of the low-pressure concentrated brine discharge pipe 116, a tail sealing ring 118 is installed on the inner wall of the installation pipe 117, a sealing rod 112 is slidably connected to the inner wall of the tail sealing ring 118, and a reversing plate 111 is installed at one end of the sealing rod 112 near the reciprocating screw 110. The reversing plate 111 is installed on the reciprocating screw 110.

[0030] In the above structure, the tail sealing ring 118 serves to fix and limit the tail sealing ring 118. The tail sealing ring 118 can seal the connection between the sealing rod 112 and the installation tube 117, preventing the depressurized concentrated brine from leaking through the installation tube 117 and improving the sealing performance of the device. At the same time, the tail sealing ring 118 can also keep the round rod 106, the reciprocating screw 110 and the sealing rod 112 on the same horizontal line, improving the stability of the device. With the reversing plate 111, when the reversing plate 111 contacts the slider 119, the reciprocating screw 110 can move towards the low-pressure concentrated brine discharge pipe 116.

[0031] In a preferred embodiment: a limiting rod 125 is installed on the inner wall of the outer casing 101, and a limiting block 124 is slidably connected to the outer edge of the limiting rod 125. The limiting block 124 is installed on the pressurizing piston 102.

[0032] In the above structure, by setting the limiting block 124 and the limiting rod 125, when the pressurizing piston 102 and the limiting block 124 are moving, the limiting block 124 on the pressurizing piston 102 slides on the limiting rod 125, so that the pressurizing piston 102 always maintains linear motion. Because of the setting of the limiting groove 105 and the protrusion 107, if the pressurizing piston 102 is not limited, the pressurizing piston 102 will affect the rotation of the impeller 120 and the slider 119. Through the cooperation of the limiting rod 125 and the limiting block 124, when the impeller 120 and the slider 119 rotate, they will drive the reciprocating screw 110, the round rod 106 and the pressurizing piston 102 to move, which further improves the rationality of the device. When the pressurizing piston 102 contacts the limiting rod 125, the rotation of the impeller 120 and the slider 119 will drive the pressurizing piston 102 to move towards the sealing plate 126.

[0033] In a preferred embodiment: an extension tube 122 is installed at the end of the power housing 113 away from the protective housing 115, and a central sealing ring 123 is installed at the end of the extension tube 122 away from the power housing 113. The round rod 106 is slidably connected to the central sealing ring 123 and the extension tube 122.

[0034] In the above structure, by setting the extension tube 122, a central sealing ring 123 can be installed on the extension tube 122. The central sealing ring 123 can seal between the round rod 106 and the extension tube 122, so that the concentrated brine in the power housing 113 will not enter the outer housing 101 through the extension tube 122, further improving the sealing performance of the device. The reciprocating screw 110 can carry the concentrated brine into the extension tube 122 without exceeding the central sealing ring 123. The movement of the reciprocating screw 110 in the extension tube 122 can also carry the concentrated brine in the extension tube 122 away from the extension tube 122, so that the concentrated brine will not exist in the extension tube 122 for a long time.

[0035] In a preferred embodiment, an observation groove 129 is provided on the outer wall of the power housing 113, and a sealed glass 130 is installed on the inner wall of the observation groove 129.

[0036] In the above structure, through the setting of the observation slot 129 and the sealing glass 130, the inspection personnel can observe whether there is seawater between the pressurizing piston 102 and the power housing 113 through the observation slot 129. If there is seawater, it means that the sealing components on the device are damaged and the sealing components on the device need to be replaced in time.

[0037] In a preferred embodiment: a high-pressure seawater discharge pipe 127 is equipped with a high-pressure seawater check valve 2 at the end away from the outer casing 101, and a low-pressure seawater inlet pipe 128 is equipped with a low-pressure seawater check valve 3 at the end away from the outer casing 101.

[0038] In the above structure, with the high-pressure seawater check valve 2 and the low-pressure seawater check valve 3, when seawater enters the outer shell 101, the low-pressure seawater check valve 3 is in the open state and the high-pressure seawater check valve 2 is in the closed state. When seawater needs to exit from the outer shell 101, the low-pressure seawater check valve 3 is in the closed state and the high-pressure seawater check valve 2 is in the open state. The extraction of the pressurizing piston 102 and the pressure of the seawater itself can open the low-pressure seawater check valve 3. When the pressurizing piston 102 is squeezing the seawater, the squeezed seawater will close the low-pressure seawater check valve 3, while the high-pressure seawater check valve 2 will be opened by the pressure of the seawater.

[0039] The operating method of the hydraulic switching valve assembly for the energy recovery device includes the following steps: S1: High-pressure concentrated brine enters the power housing 113 through the high-pressure concentrated brine inlet pipe 114. The flow of high-pressure concentrated brine drives the impeller 120 and slider 119 in the power housing 113 to rotate. S2: When the impeller 120 and the slider 119 rotate, they drive the reciprocating screw 110, sealing rod 112, round rod 106, pressure piston 102 and piston cover 103 to move towards the sealing plate 126 in the outer shell 101. The pressure piston 102 and piston cover 103 squeeze the low-pressure seawater in the outer shell 101, and the low-pressure seawater is discharged through the high-pressure seawater discharge pipe 127 and the high-pressure seawater check valve 2. S3: The continuous input of high-pressure concentrated brine will drive the impeller 120 and slider 119 to rotate continuously. When the pressurizing piston 102 contacts the limiting rod 125, the reciprocating screw 110, sealing rod 112, round rod 106, pressurizing piston 102 and piston cover 103 move in the opposite direction to the sealing plate 126 in the outer shell 101. S4: Low-pressure seawater is pumped into the outer shell 101 by pressurizing piston 102 and piston cover 103, so that the outer shell 101 contains low-pressure seawater to be pressurized.

[0040] Working principle: During use, high-pressure concentrated brine enters the power housing 113 through the high-pressure concentrated brine inlet pipe 114. The high-pressure concentrated brine flowing in the power housing 113 drives the impeller 120 and slider 119 to rotate, allowing the high-pressure concentrated brine to undergo initial decompression. The rotation of the impeller 120 and slider 119 drives the reciprocating screw 110, sealing rod 112, round rod 106, pressure piston 102, and piston cover 103 to move within the outer casing 101. When the piston cover 103 moves toward the sealing plate 126, the pressurizing piston 102 and piston cover 103 compress the seawater in the outer casing 101. This compression closes the low-pressure seawater check valve 3 and opens the high-pressure seawater check valve 2, pressurizing the seawater in the outer casing 101. The pressure of the high-pressure concentrated brine is switched to that of the low-pressure seawater, thus pressurizing the low-pressure seawater into high-pressure seawater. The continuous rotation of the impeller 120 and slider 119 causes the slider 119 to contact the reversing plate 111. After the reversing plate 111 contacts, the reciprocating screw 110, sealing rod 112, round rod 106, pressurizing piston 102, and piston cover 103 move in the opposite direction to the sealing plate 126 within the outer casing 101. At this time, the pressurizing piston 102 and piston cover 103 draw low-pressure seawater into the outer casing 101 through the low-pressure seawater check valve 3 and the low-pressure seawater inlet pipe 128. The low-pressure seawater check valve 3 is opened by the force of the pressurizing piston 102 and the pressure of the seawater, while the high-pressure seawater check valve 2 remains closed. When the pressurizing piston 102 moves, it causes the limiting block 124 to move on the limiting rod 125. When the pressurizing piston 102 contacts the limiting rod 125, the reciprocating screw 110, sealing rod 112, round rod 106, pressurizing piston 102 and piston cover 103 continue to move from the outer shell 101 toward the sealing plate 126 to pressurize the seawater. As long as high-pressure concentrated brine enters the power housing 113 through the high-pressure concentrated brine inlet pipe 114, the pressure conversion of high-pressure concentrated brine can be achieved.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended technical solutions and their equivalents.

Claims

1. A hydraulic switching valve assembly for an energy recovery device, comprising a switching valve assembly body (1), characterized in that: The outer wall of the switching valve group body (1) is provided with a high-pressure seawater check valve (2) and a low-pressure seawater check valve (3). The switching valve assembly body (1) includes an outer shell (101), a pressure piston (102) is slidably connected to the inner wall of the outer shell (101), a piston cover (103) is installed on the outer wall of the pressure piston (102), a round rod (106) is installed on the inner wall of the pressure piston (102), a reciprocating screw (110) is installed at the end of the round rod (106) away from the pressure piston (102), a slider (119) is threadedly connected to the outer edge of the reciprocating screw (110), an impeller (120) is installed on the outer wall of the slider (119), and a power source is installed on the outer wall of the outer shell (101). The impeller (120) is located in the power housing (113). A high-pressure concentrated brine inlet pipe (114) is installed on the outer wall of the power housing (113). A protective shell (115) is installed at the end of the power housing (113) away from the outer shell (101). A low-pressure concentrated brine outlet pipe (116) is installed on the outer wall of the protective shell (115). A sealing plate (126) is installed at the end of the outer shell (101) away from the power housing (113). A high-pressure seawater outlet pipe (127) and a low-pressure seawater inlet pipe (128) are installed on the outer wall of the sealing plate (126).

2. The hydraulic switching valve assembly for an energy recovery device according to claim 1, characterized in that: The inner wall of the pressurizing piston (102) is provided with a circular hole (104), the circular rod (106) is located in the circular hole (104), the outer wall of the circular rod (106) is provided with a circular groove (108), and a retaining ring (109) is installed on the inner wall of the circular groove (108).

3. The hydraulic switching valve assembly for an energy recovery device according to claim 2, characterized in that: The inner wall of the circular hole (104) is provided with a limiting groove (105), and the outer wall of the circular rod (106) is provided with a protrusion (107). The protrusion (107) is located in the limiting groove (105). The circular groove (108) and the snap ring (109) are provided in two sets, and the two circular grooves (108) and the two snap rings (109) are located on both sides of the protrusion (107).

4. The hydraulic switching valve assembly for an energy recovery device according to claim 1, characterized in that: A fan wheel (121) is installed at the end of the impeller (120) away from the pressurizing piston (102), and the fan wheel (121) is located in the protective shell (115).

5. The hydraulic switching valve assembly for an energy recovery device according to claim 1, characterized in that: The outer wall of the low-pressure concentrated brine discharge pipe (116) is equipped with an installation pipe (117), and the inner wall of the installation pipe (117) is equipped with a tail sealing ring (118). The inner wall of the tail sealing ring (118) is slidably connected with a sealing rod (112). A reversing plate (111) is installed at one end of the sealing rod (112) near the reciprocating screw (110). The reversing plate (111) is installed on the reciprocating screw (110).

6. The hydraulic switching valve assembly for an energy recovery device according to claim 1, characterized in that: A limiting rod (125) is installed on the inner wall of the outer shell (101), and a limiting block (124) is slidably connected to the outer edge of the limiting rod (125). The limiting block (124) is installed on the pressurizing piston (102).

7. The hydraulic switching valve assembly for an energy recovery device according to claim 5, characterized in that: An extension tube (122) is installed at one end of the power housing (113) away from the protective housing (115), and a central sealing ring (123) is installed at one end of the extension tube (122) away from the power housing (113). The round rod (106) is slidably connected to the central sealing ring (123) and the extension tube (122).

8. The hydraulic switching valve assembly for an energy recovery device according to claim 1, characterized in that: The outer wall of the power housing (113) is provided with an observation groove (129), and the inner wall of the observation groove (129) is fitted with a sealed glass (130).

9. The hydraulic switching valve assembly for an energy recovery device according to claim 1, characterized in that: A high-pressure seawater check valve (2) is installed at the end of the high-pressure seawater discharge pipe (127) away from the outer shell (101), and a low-pressure seawater check valve (3) is installed at the end of the low-pressure seawater inlet pipe (128) away from the outer shell (101).

10. A method for operating a hydraulic switching valve assembly for an energy recovery device, characterized in that: Includes the following steps: S1: High-pressure concentrated brine enters the power housing (113) through the high-pressure concentrated brine inlet pipe (114). The flow of high-pressure concentrated brine drives the impeller (120) and slider (119) in the power housing (113) to rotate. S2: The impeller (120) and slider (119) rotate, driving the reciprocating screw (110), sealing rod (112), round rod (106), pressurizing piston (102) and piston cover (103) to move towards the sealing plate (126) in the outer shell (101). The pressurizing piston (102) and piston cover (103) squeeze the low-pressure seawater in the outer shell (101), and the low-pressure seawater is discharged through the high-pressure seawater discharge pipe (127) and the high-pressure seawater check valve (2). S3: The continuous input of high-pressure concentrated brine will drive the impeller (120) and slider (119) to rotate continuously. When the pressurizing piston (102) comes into contact with the limiting rod (125), the reciprocating screw (110), sealing rod (112), round rod (106), pressurizing piston (102) and piston cover (103) move in the opposite direction to the sealing plate (126) in the outer shell (101); S4: Low-pressure seawater is pumped into the outer shell (101) by pressurizing piston (102) and piston cover (103), so that the outer shell (101) contains low-pressure seawater to be pressurized.

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