A turbine type high-efficiency hydraulic turbine pump based on nuclear power for seawater desalination

Abstract

The present application relates to the technical field of seawater desalination, and discloses a turbine type high-efficiency hydraulic turbine pump for nuclear power seawater desalination, which comprises a turbine type turbine pump, a pressure cabin in sealing communication with the outer wall of an inlet flange, a piston member in sliding connection in the pressure cabin, a base ring fixedly connected to the inner wall of the inlet flange, a fixed ring fixedly connected to the base ring, a plurality of guide plates in annular equidistant distribution between the fixed ring and the base ring, a hollow groove formed in the upper part of the guide plate, and an expansion plate in rotary connection in the hollow groove. The pressure cabin and the piston member cooperatively monitor the water pressure change. When the water pressure decreases, the piston member drives the positioning ring to synchronously descend, thereby releasing the expansion plate from the limiting. After the expansion plate is turned out, the area of the upper part of the guide plate is increased, the water flow impacts the guide slope, drives the guide plate to deflect to form a spiral guide member, accurately corrects the water flow inflow angle, makes it adapt to the turbine blade inlet angle, effectively suppresses the cavitation phenomenon, and guarantees that the turbine type turbine pump is always in the best kinetic energy conversion working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seawater desalination, and particularly relates to a turbine type high-efficiency hydraulic turbine pump for nuclear power seawater desalination. BACKGROUND

[0002] The hydraulic turbine pump is a key energy-saving device in the field of seawater desalination, and its core function is to recover the energy of high-pressure liquid. In the process of seawater desalination, it drives the hydraulic turbine by means of the high-pressure concentrated brine generated by the reverse osmosis membrane element, converts the residual pressure energy of the concentrated brine into mechanical energy, and then transmits the mechanical energy to the pump end through coaxial transmission to drive the pump body to rotate to pressurize the feed seawater, thereby reducing the energy consumption of the seawater pressurization link and achieving the energy-saving goal.

[0003] However, the current widely used turbine type turbine pump has design limitations: such devices all have a highest efficiency point, and only when the flow and pressure of the liquid are near the design point, the highest efficiency can be achieved. Once the operating condition deviates from the design value, the turbine efficiency will drop significantly. The seawater desalination plant needs to adjust the load according to the change of water demand (such as day and night alternation, seasonal change), which leads to the fact that the turbine pump is often operated in a non-design condition, and the actual average energy-saving effect is far lower than the theoretical value.

[0004] Especially when the system load (flow) is reduced, cavitation phenomenon is easily caused, that is, local pressure is too low to cause liquid vaporization to form bubbles, a large number of bubbles occupy the flow passage space, change the effective flow area and direction of the fluid, and destroy the streamline flow designed for the impeller, which will cause the head (or output power), efficiency and flow of the device to drop sharply, and the performance curve will become unstable. At the same time, the bubbles will impact and damage the surface of the impeller when they break, and once the turbine pump is damaged and stops for maintenance, the seawater desalination process will be forced to stop, which seriously limits the flexibility of the desalination plant operation. Therefore, in order to protect the equipment, the seawater desalination plant sometimes has to avoid the low load operation interval, or is forced to sacrifice the operating efficiency, and is in a dilemma. SUMMARY

[0005] In view of the problem in the prior art that when the system load is reduced, cavitation phenomenon occurs in the turbine pump, which damages the turbine and reduces the seawater desalination efficiency, a turbine type high-efficiency hydraulic turbine pump for nuclear power seawater desalination is provided.

[0006] The purpose is to set a pre-rotation mechanism in the inlet flange, cancel the limiting of the expansion plate when the water pressure is reduced, change the stress angle of the guide plate when the expansion plate is unfolded, guide the water flow to rotate after the guide plate is inclined, match the flow rate and direction of the water flow again, and inhibit the cavitation phenomenon.

[0007] The technical scheme of the present application is a turbine type high-efficiency hydraulic turbine pump for nuclear power seawater desalination, comprising a turbine type turbine pump, an inlet flange and an outlet flange arranged on the turbine type turbine pump, a pressure cabin in sealing communication with the outer wall of the inlet flange, a piston connected slidingly in the pressure cabin, a plurality of elastic elements connected between the piston and the pressure cabin, a base ring fixedly connected to the inner wall of the inlet flange, a fixed ring fixedly connected in the base ring, a plurality of guide plates distributed at equal intervals in a ring shape between the fixed ring and the base ring, a connecting shaft fixedly connected to the upper part of the guide plate, the connecting shaft being rotatably connected to the base ring and the fixed ring at both ends, and an air slot being formed in the upper part of the guide plate, an expansion plate being rotatably connected in the air slot, the area of the expansion plate from the shaft center to one side of the fixed ring being greater than the area of the expansion plate from the shaft center to one side of the base ring, and a guide inclined surface being formed in the upper end of the expansion plate.

[0008] A positioning ring is vertically and slidingly connected in the fixed ring, a rope is connected between the positioning ring and the piston, and the positioning ring and the expansion plate are in abutting cooperation.

[0009] Further, a drainage inclined surface is formed in one end of the base ring towards the inlet end of the inlet flange.

[0010] Further, the piston comprises a piston plate, a piston ring is fixedly connected to the outer edge of the piston plate, and the piston ring is in sliding contact with the inner wall of the pressure cabin.

[0011] A plurality of elastic elements are distributed at equal intervals in a ring shape, the elastic element comprises a telescopic rod, a spring is sleeved on the outer side of the telescopic rod, the two ends of the spring are fixedly connected with the two ends of the telescopic rod, and the two ends of the telescopic rod are fixedly connected with the piston plate and the inner wall of the pressure cabin.

[0012] Further, a ring-shaped groove is formed in the outer wall of the base ring, a sealing ring is sleeved on the ring-shaped groove, the sealing ring is in close abutment with the inner wall of the inlet flange, and a plurality of positioning bolts are connected between one end of the base ring and the inlet flange.

[0013] Further, the rotation range of the expansion plate is 0° to 50°, and a gap is formed in the side of the fixed ring towards the expansion plate.

[0014] Further, a fixed frame is fixedly connected between the inner part of the base ring and the upper end of the fixed ring, a wire bundling frame is fixedly connected in one end of the pressure cabin towards the inlet flange, through holes are formed in the fixed frame and the wire bundling frame, and the rope is movably penetrated through the through holes of the fixed frame and the wire bundling frame.

[0015] Further, a plurality of convex strips are fixedly arranged on the inner wall of the fixed ring, and a sliding groove matched with the convex strips is formed in the outer wall of the positioning ring.

[0016] Further, a plurality of movable plates are distributed equidistantly in the annular form in the positioning ring, the movable plates are located below the gap, the upper part of the movable plate is rotationally connected with a movable shaft, and the movable shaft is rotationally connected with the positioning ring.

[0017] Further, the piston plate is fixedly connected with a synchronous rod on the side away from the inlet flange, the other end of the synchronous rod is movably penetrated to the outside of the pressure cabin, and a pressure scale is axially engraved on the outer wall of the synchronous rod.

[0018] The outer wall of the pressure cabin is fixedly connected with a fixed seat, the fixed seat is sleeved on the outside of the synchronous rod, and the fixed seat is screwedly connected with a fastening bolt.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The pressure cabin and the piston piece cooperatively monitor the water pressure change, when the water pressure decreases, the piston piece drives the positioning ring to synchronously descend, and the limiting of the expansion plate is released. After the expansion plate is turned out, the area of the upper part of the guide plate is increased, the water flow impacts the guide inclined surface, drives the guide plate to deflect to form a spiral guide piece, accurately corrects the water flow inflow angle, makes it adapt to the turbine blade inlet angle, effectively suppresses the cavitation phenomenon, and guarantees that the turbine type turbine pump is always in the best kinetic energy conversion working condition.

[0021] 2. During the deflection process of the guide plate, the expansion plate will drive the movable plate in the fixed ring to synchronously rotate, and the two always maintain the same direction of the inclined state. This design greatly enlarges the water flow guiding area, not only enhances the regularizing effect on the water flow, but also further improves the stability and accuracy of the water flow guidance, so that the water flow state is more suitable for the operation requirement of the turbine pump.

[0022] 3. By rotating the fastening bolt, the position of the synchronous rod can be manually adjusted and locked, and then the working state of the piston piece and the guide plate is fixed. This function makes the equipment can flexibly control the water flow guiding effect under complex and changeable water pressure conditions, and takes into account the convenience of automatic adjustment and the flexibility of manual intervention, significantly improves the operation reliability and equipment adaptability of the guide plate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic view of the overall structure of the present application;

[0024] Figure 2 It is a structure schematic view of the base ring and the sealing ring of the present application;

[0025] Figure 3 It is a structure sectional view schematic view of the inlet flange and the pressure cabin of the present application;

[0026] Figure 4 It is a structure sectional view schematic view of the inlet flange and the pressure cabin of the present application;

[0027] Figure 5 Structure diagram of the base ring, fixing ring and flow guide plate of the present application;

[0028] Figure 6 Structure diagram of the extension plate and positioning ring of the present application;

[0029] Figure 7 Structure diagram of the flow guide plate and extension plate of the present application;

[0030] Figure 8 Structure diagram of the positioning ring and movable plate of the present application;

[0031] Figure 9 Structure diagram of the flow guide plate, extension plate and movable plate of the present application in the inclined and unfolded state.

[0032] In the figure:

[0033] 1. Turbine type turbine pump; 2. Inlet flange; 3. Outlet flange; 4. Pressure cabin; 5. Piston piece; 51. Piston plate; 52. Piston ring; 6. Elastic piece; 61. Telescopic rod; 62. Spring; 7. Base ring; 8. Annular groove; 9. Sealing ring; 10. Fixing ring; 11. Flow guide plate; 12. Empty groove; 13. Extension plate; 14. Flow guide inclined surface; 15. Letting gap; 16. Positioning ring; 17. Rope; 18. Fixing frame; 19. Wire binding frame; 20. Convex strip; 21. Movable plate; 22. Positioning bolt; 23. Synchronous rod; 24. Fixing seat; 25. Fastening bolt; 26. Pressure scale. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] Example 1, refer to Figures 1-7For the first embodiment of the present application, a turbine type high-efficiency hydraulic turbine pump for nuclear power seawater desalination is provided, comprising a turbine type turbine pump 1, an inlet flange 2 and an outlet flange 3 arranged on the turbine type turbine pump 1, the outer wall of the inlet flange 2 is in sealing communication with a pressure cabin 4, the piston piece 5 is slidably connected in the pressure cabin 4, a plurality of elastic pieces 6 are connected between the piston piece 5 and the pressure cabin 4, the inner wall of the inlet flange 2 is fixedly connected with a base ring 7, the inner wall of the base ring 7 is fixedly connected with a fixed ring 10, a plurality of guide plates 11 are annularly and equidistantly distributed between the fixed ring 10 and the base ring 7, a connecting shaft is fixedly connected to the upper part of the guide plate 11, the two ends of the connecting shaft are rotatably connected with the base ring 7 and the fixed ring 10 respectively, and a hollow groove 12 is formed in the upper part of the guide plate 11, an expansion plate 13 is rotatably connected in the hollow groove 12, the area from the axis of the expansion plate 13 to one side of the fixed ring 10 is larger than the area from the axis of the expansion plate 13 to one side of the base ring 7, and a guide inclined surface 14 is formed in the upper end of the expansion plate 13; a positioning ring 16 is vertically and slidably connected in the fixed ring 10, a rope 17 is connected between the positioning ring 16 and the piston piece 5, and the side edge of the positioning ring 16 abuts against the expansion plate 13.

[0036] Specifically, the inside of the pressure cabin 4 is synchronous with the pressure in the water inlet pipe, the water pressure change drives the piston piece 5 to move axially in the pressure cabin 4, when the water pressure decreases, the piston piece 5 moves through the rope 17 to drive the positioning ring 16 to descend, after the positioning ring 16 cancels the limiting of the expansion plate 13, the expansion plate 13 rotates to the outside of the guide plate 11, when the water flow passes through the base ring 7 area, it will contact the guide inclined surface 14 on the expansion plate 13, the water flow impact force drives the guide plate 11 to deflect synchronously around the connecting shaft, so that the fixed ring 10, the guide plate 11 and the base ring 7 cooperate to form a complete spiral guide piece. Subsequently, the water flow spirally flows under the joint guidance of the guide plate 11 and the expansion plate 13, so as to change the flow rate and direction of the water flow, correct the relative inflow angle of the water flow, ensure that the water flow movement direction is highly matched with the turbine blade inlet angle of the turbine type turbine pump 1, and ensure that the turbine type turbine pump 1 remains in the best efficiency kinetic energy conversion working condition.

[0037] The present application can automatically adjust the guide structure according to the water pressure change in the water inlet pipe without manual intervention, realize the dynamic optimization of the water flow state, correct the relative inflow angle of the water flow, maintain the adaptability of the water flow and the turbine blade under low load working condition, reduce the probability of cavitation phenomenon, effectively alleviate the efficiency decline problem of the traditional turbine pump under non-design working condition, reduce the risk of impeller damage, prolong the service life of the equipment, and improve the stability and flexibility of the nuclear power seawater desalination system operation.

[0038] It should be noted that Figure 3 The communication port of the pressure cabin 4 and the inlet flange 2 is arranged above the base ring 7, the water pressure in the pressure cabin 4 is synchronous with the water pressure in the water inlet pipe, and the piston piece 5 is matched to monitor the water pressure change.

[0039] With reference to Figure 3 , the base ring 7 is provided with a drainage inclined surface at one end of the inlet end of the inlet flange 2.

[0040] Specifically, when the water flow enters the base ring 7, the drainage inclined surface at the inlet end of the base ring 7 can pre-comb the water flow, reduce the initial turbulence, and improve the stability after the water flow enters.

[0041] With reference to Figure 3 , Figure 4 , the piston piece 5 includes a piston plate 51, the outer circular side of the piston plate 51 is fixedly connected with a piston ring 52, the piston ring 52 is in sliding contact with the inner wall of the pressure cabin 4; a plurality of elastic pieces 6 are distributed in a ring shape at equal intervals, the elastic piece 6 includes a telescopic rod 61, the telescopic rod 61 is sleeved with a spring 62 on the outer side, the two ends of the spring 62 are respectively connected and fixed with the two ends of the telescopic rod 61, and the two ends of the telescopic rod 61 are respectively connected and fixed with the piston plate 51 and the inner wall of the pressure cabin 4.

[0042] Specifically, the piston plate 51 cooperates with the piston ring 52 to separate the inside of the pressure cabin 4, preventing the water flow from overflowing through the pressure cabin 4, and under the action of water pressure, the piston piece 5 will slide away from the inlet flange 2, and the setting of the elastic piece 6 offsets the thrust of the water pressure, when the water pressure changes, the elastic piece 6 drives the piston piece 5 to move adaptively, wherein when the water pressure decreases, the elastic force of the elastic piece 6 is greater than the water pressure, and the piston piece 5 moves left in the pressure cabin 4; when the water pressure increases, the elastic force of the elastic piece 6 is less than the water pressure, and the piston piece 5 moves right in the pressure cabin 4.

[0043] With reference to Figure 2 , the outer side wall of the base ring 7 is provided with a ring-shaped groove 8, the ring-shaped groove 8 is sleeved with a sealing ring 9, the sealing ring 9 is in close abutment with the inner wall of the inlet flange 2, and a plurality of positioning bolts 22 are connected between one end of the base ring 7 and the inlet flange 2.

[0044] Specifically, the base ring 7 is sealed and connected with the inner wall of the inlet flange 2 through cooperation with the sealing ring 9; a threaded groove adapted to the positioning bolt 22 is pre-formed on the inner wall of the inlet flange 2, the positioning bolt 22 is threadedly connected with the corresponding threaded groove after passing through the base ring 7, so as to complete the fixation of the base ring 7 and the inlet flange 2, which can solve the cavitation problem caused by the reduction of water pressure at the minimum cost without changing the existing equipment structure, and is simple to disassemble and assemble, facilitating subsequent maintenance.

[0045] With reference to Figures 6-8 , the rotation range of the expansion plate 13 is 0° to 50°, and the side of the fixed ring 10 facing the expansion plate 13 is provided with a gap notch 15.

[0046] Specifically, in the working condition without water pressure reduction, the upper end of the positioning ring 16 limits the expansion plate 13, so that the expansion plate 13 is accommodated in the empty slot 12; when the water pressure is reduced, the positioning ring 16 is lowered and the limitation on the expansion plate 13 is cancelled; due to the gravity of the expansion plate 13 towards the side of the fixed ring 10 being greater than the other side, the expansion plate 13 rotates into the corresponding gap 15 under the action of gravity; at this time, the area sum of the upper part of the guide plate 11 shaft and the expansion plate 13 is greater than the area of the lower part of the guide plate 11 shaft; at this time, when the water flow passes through the guide slope 14, the expansion plate 13 and the guide plate 11 are pushed to rotate until the expansion plate 13 is in contact with the gap 15; the guide plate 11 is arranged at a certain angle with the water flow direction, and the passing water flow moves in a spiral manner under the guidance of the guide plate 11.

[0047] The state switching of the expansion plate 13 is automatically controlled through water pressure change, the water flow form is adaptively adjusted, the spiral water flow design can improve the kinetic energy utilization efficiency of the water flow, and the stability and reliability of the structure movement are ensured through the synergistic effect of gravity and water flow thrust.

[0048] Wherein, when the turbine type turbine pump 1 restores the best operating condition, high water pressure makes the piston 5 drive the positioning ring 16 to rise, the upper end of the positioning ring 16 is in sliding contact with the inclined surface of the expansion plate 13, the expansion plate 13 is pushed to rotate reversely, and the expansion plate 13 is limited in the empty slot 12; at this time, due to the area of the lower part of the guide plate 11 shaft being greater than the area of the upper part of the guide plate 11 shaft, the guide plate 11 is arranged in parallel with the water flow, does not guide the water flow, and thus does not affect the best inflow angle of the water flow under the normal working condition.

[0049] Referring to Figure 4 , Figure 5 The inner part of the base ring 7 and the upper end of the fixed ring 10 are fixedly connected together, the fixed frame 18 is fixedly connected in one end of the pressure cabin 4 towards the inlet flange 2, the fixed frame 18 and the line binding frame 19 are both provided with through holes, and the rope 17 is movably penetrated through the through holes of the fixed frame 18 and the line binding frame 19.

[0050] Specifically, the fixed frame 18 and the line binding frame 19 jointly limit the rope 17; when the piston 5 moves with the change of water pressure, the rope 17 can always maintain the best tension angle, so as to stably drive the positioning ring 16 to realize synchronous movement.

[0051] Embodiment 2, referring to Figure 8 This is the second embodiment of the application, which is different from the first embodiment in that a plurality of protrusions 20 are fixedly arranged on the inner wall of the fixed ring 10 in the axial direction, and the outer wall of the positioning ring 16 is provided with sliding grooves matched with the protrusions 20.

[0052] Specifically, the cooperation of the protrusions 20 and the corresponding sliding grooves enables the positioning ring 16 to slide straightly along the axial direction of the fixed ring 10.

[0053] Referring to Figure 8 , Figure 9 , the positioning ring 16 is annularly and equidistantly distributed with a plurality of movable plates 21 below the gap 15, and the upper part of the movable plate 21 is rotatably connected with a movable shaft, and the movable shaft is rotatably connected with the positioning ring 16.

[0054] Specifically, the movable plate 21 is the same as the guide plate 11, and in the working condition where the water pressure is not reduced, the movable plate 21 is arranged in parallel with the water flow, and after the water pressure is reduced, the expansion plate 13 is deflected into the gap 15 and then contacts the upper end of the movable plate 21, so that the movable plate 21 is deflected synchronously with the guide plate 11, thereby further increasing the guiding area of the water flow.

[0055] Through the cooperative action of the movable plate 21 and the guide plate 11, the water flow guiding area can be significantly increased, and the water flow guiding effect can be improved; at the same time, the linkage design of the movable plate 21 makes the overall structure more flexible in adjusting the water flow state, and can adapt to the water flow control requirements under different water pressure conditions. The rest of the structure is the same as that of example 1.

[0056] Example 3, referring to Figure 4 , this is the third embodiment of the application, which is different from the second embodiment: the piston plate 51 is fixedly connected with a synchronous rod 23 away from the inlet flange 2, the other end of the synchronous rod 23 is movably penetrated to the outside of the pressure chamber 4, and the outer wall of the synchronous rod 23 is axially marked with a pressure scale 26; the outer wall of the pressure chamber 4 is fixedly connected with a fixed seat 24, the fixed seat 24 is sleeved on the outside of the synchronous rod 23, and the fixed seat 24 is threadedly connected with a fastening bolt 25.

[0057] Specifically, when the piston 5 moves with the change of water pressure, the worker can intuitively master the water pressure change value in the inlet flange 2 through the displacement change of the synchronous rod 23 and the pressure scale 26; when the water pressure changes frequently or is unstable, the position of the synchronous rod 23 can be manually adjusted, and then the fastening bolt 25 is rotated to tightly abut against the synchronous rod 23, so as to artificially fix the position of the piston 5, thereby realizing manual control of the angle state of the guide plate 11. The cooperation of the pressure scale 26 and the synchronous rod 23 realizes the visual monitoring of the water pressure change, which is convenient for real-time mastering of the working condition; the manual adjustment function improves the adaptability of the equipment, which can flexibly control the water flow guiding state under complex water pressure conditions, and enhances the convenience and reliability of the operation.

[0058] The sliding gap is arranged between the synchronizing rod 23 and the fixing seat 24, the gap is used for keeping the air pressure in the pressure cabin 4 synchronized with the outside when the piston 5 moves, avoiding the air pressure to interfere with the movement of the piston 5, the pressure scale 26 is calibrated based on the displacement of the synchronizing rod 23, the displacement parameter of the synchronizing rod 23 is converted into the corresponding pressure value in advance and marked as the scale, therefore the actual displacement of the synchronizing rod 23 can be directly read through the pressure scale 26, realizing the visualization of the displacement and the pressure. The rest of the structure is the same as that of the embodiment 2.

[0059] In combination with the embodiments 1-3, the working principle of the present application is as follows: when the water pressure is reduced, the elastic member 6 drives the piston 5 to move left.

[0060] The piston 5 is connected with the positioning ring 16 in the fixing ring 10 through the rope 17, the water pressure is reduced to make the positioning ring 16 descend, releasing the limiting of the expansion plate 13 in the empty slot 12 of the guide plate 11. The expansion plate 13 rotates to the leaving gap 15 of the fixing ring 10 due to the gravity difference, the water flow impacts the guide slope 14 of the expansion plate 13, driving the guide plate 11 to deflect around the connecting shaft, forming the spiral guide member with the base ring 7 and the fixing ring 10, guiding the water flow to flow spirally, correcting the relative inflow angle of the water flow, making it adapt to the turbine blade inlet angle of the turbine type turbine pump 1, maintaining the best kinetic energy conversion working condition and reducing the cavitation.

[0061] When the water pressure is restored, the piston 5 drives the positioning ring 16 to ascend, pushing back the expansion plate 13 to the empty slot 12, the guide plate 11 is parallel to the water flow, not affecting the normal working condition. The whole process does not need manual intervention, realizing the dynamic optimization of the water flow and improving the equipment operation stability.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application, although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A high-efficiency turbine pump for seawater desalination in nuclear power plants, comprising a turbine pump (1), and an inlet flange (2) and an outlet flange (3) disposed on the turbine pump (1), characterized in that, The outer wall of the inlet flange (2) is sealed and connected to a pressure chamber (4). A piston (5) is slidably connected inside the pressure chamber (4). Multiple elastic components (6) are connected between the piston (5) and the pressure chamber (4). A base ring (7) is fixedly connected to the inner wall of the inlet flange (2). A fixed ring (10) is fixedly connected inside the base ring (7). Multiple guide plates (11) are distributed in a ring at equal intervals between the fixed ring (10) and the base ring (7). A connecting shaft is fixedly connected to the upper part of the guide plate (11). The two ends of the connecting shaft are rotatably connected to the base ring (7) and the fixed ring (10) respectively. A slot (12) is opened on the upper part of the guide plate (11). An extension plate (13) is rotatably connected inside the slot (12). The area from the axis of the extension plate (13) to the side of the fixed ring (10) is greater than the area from the axis of the extension plate (13) to the side of the base ring (7). A guide slope (14) is opened at the upper end of the extension plate (13). A positioning ring (16) is vertically slidably connected inside the fixing ring (10). The positioning ring (16) and the piston (5) are connected by a rope (17), and the positioning ring (16) abuts against the side of the expansion plate (13).

2. The turbine-type high-efficiency hydraulic turbine pump for nuclear power seawater desalination according to claim 1, characterized in that, The base ring (7) has a flow-guiding slope at one end facing the inlet end of the inlet flange (2).

3. The turbine-type high-efficiency hydraulic turbine pump for nuclear power seawater desalination according to claim 1, characterized in that, The piston component (5) includes a piston plate (51), and a piston ring (52) is fixedly connected to the outer circumference of the piston plate (51). The piston ring (52) slides in contact with the inner wall of the pressure chamber (4). Multiple elastic components (6) are distributed in a ring at equal intervals. Each elastic component (6) includes a telescopic rod (61). A spring (62) is sleeved on the outside of the telescopic rod (61). The two ends of the spring (62) are respectively connected and fixed to the two ends of the telescopic rod (61). The two ends of the telescopic rod (61) are respectively connected and fixed to the piston plate (51) and the inner wall of the pressure chamber (4).

4. The turbine-type high-efficiency hydraulic turbine pump for nuclear power seawater desalination according to claim 1, characterized in that, An annular groove (8) is provided on the outer wall of the base ring (7), and a sealing ring (9) is fitted on the annular groove (8). The sealing ring (9) is in close contact with the inner wall of the inlet flange (2), and multiple positioning bolts (22) are connected between one end of the base ring (7) and the inlet flange (2).

5. The turbine-type high-efficiency hydraulic turbine pump for nuclear power seawater desalination according to claim 1, characterized in that, The expansion plate (13) has a rotation range of 0° to 50°, and the fixing ring (10) has a clearance notch (15) on the side facing the expansion plate (13).

6. The turbine-type high-efficiency hydraulic turbine pump for nuclear power seawater desalination according to claim 1, characterized in that, A fixing frame (18) is fixedly connected to the inside of the base ring (7) and the upper end of the fixing ring (10). A wire harness (19) is fixedly connected to the end of the pressure chamber (4) facing the inlet flange (2). Both the fixing frame (18) and the wire harness (19) have through holes. The rope (17) moves through the through holes of the fixing frame (18) and the wire harness (19).

7. The turbine-type high-efficiency hydraulic turbine pump for nuclear power seawater desalination according to claim 1, characterized in that, The inner wall of the fixing ring (10) is axially fixed with a plurality of protrusions (20), and the outer wall of the positioning ring (16) is provided with a sliding groove that matches the protrusions (20).

8. The turbine-type high-efficiency hydraulic turbine pump for nuclear power seawater desalination according to claim 5, characterized in that, The positioning ring (16) contains a number of movable plates (21) arranged in a ring at equal intervals. The movable plates (21) are located below the clearance notch (15). The upper part of the movable plates (21) is rotatably connected to a movable shaft, which is rotatably connected to the positioning ring (16).

9. The turbine-type high-efficiency hydraulic turbine pump for nuclear power seawater desalination according to claim 3, characterized in that, The piston plate (51) is fixedly connected to a synchronizing rod (23) on the side away from the inlet flange (2). The other end of the synchronizing rod (23) extends movably through to the outside of the pressure chamber (4), and pressure scales (26) are axially engraved on the outer wall of the synchronizing rod (23). The outer wall of the pressure chamber (4) is fixedly connected to a fixing seat (24), the fixing seat (24) is sleeved on the outside of the synchronizing rod (23), and a fastening bolt (25) is threaded on the fixing seat (24).

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