A kind of submerged liquid hydrogen pump impeller anti-cavitation device

Abstract

The utility model relates to the field of liquid hydrogen pump impeller anti cavitation discloses a kind of submerged liquid hydrogen pump impeller anti cavitation device, including fixed cylinder, the fixed cylinder inside is provided with pressure reducing mechanism and adjusting water flow mechanism, the pressure reducing mechanism includes impeller, the impeller outer wall is fixedly connected with conveying column, the conveying column outer wall is fixedly connected with conveying twisted blade, the conveying column outer wall is rotatably connected with fixed support, the fixed cylinder outer wall is fixedly connected with water outlet pipe, the fixed support outer wall is fixedly connected with water inlet pipe.In the utility model, pressure reducing mechanism is driven by motor to rotate synchronously with impeller and conveying column, conveying twisted blade reduces liquid hydrogen turbulent flow, fixed support guarantees conveying column stability, one-way ring guides high-pressure liquid hydrogen backflow to fixed cylinder inlet side to supplement pressure, inhibits bubble generation from the source, avoids impeller damage, guarantees liquid hydrogen flow continuous, maintains the flow and lift stability of pump, reduces noise vibration, prevents pump body failure.

Description

Technical Field

[0001] This utility model relates to the field of anti-cavitation of liquid hydrogen pump impellers, and in particular to an anti-cavitation device for submersible liquid hydrogen pump impellers. Background Technology

[0002] The liquid hydrogen pump impeller is a key component in a liquid hydrogen pump used for pressurizing and transporting liquid hydrogen. It is usually mounted on the pump shaft and consists of a series of blades. Through high-speed rotation, it generates centrifugal force, converting the kinetic energy of liquid hydrogen into pressure energy, thereby achieving efficient transport of liquid hydrogen.

[0003] Before activating the anti-cavitation device on the liquid hydrogen pump impeller, check the sealing performance to ensure there is no liquid hydrogen leakage at the connection points, confirm that the assembly clearance between the device and the pump body meets the technical specifications, verify that the preheating or precooling system is in normal condition, and perform gradient cooling of the anti-cavitation components according to the liquid hydrogen pump startup procedure to avoid damage to the components due to low temperature impact. Check the filter device of the inlet pipeline and remove impurities to prevent blockage of the flow channel and ensure the continuity and cleanliness of the liquid hydrogen supply. Confirm that the regulating mechanism is in the initial setting position and matches the rated operating parameters of the liquid hydrogen pump. After starting the liquid hydrogen pump, the relevant functions of the anti-cavitation device must be activated simultaneously.

[0004] Liquid hydrogen possesses unique physical properties such as low density, low viscosity, and low latent heat of vaporization. When these cavitation bubbles move with the liquid flow to the high-pressure area, they collapse instantly, generating high-frequency, high-intensity pulsating shock waves that continuously impact the impeller surface. This causes fatigue and loosening of the metal grains on the impeller surface, as well as material spalling. Simultaneously, the formation and collapse of cavitation bubbles disrupt the continuity of liquid hydrogen flow, resulting in unstable pump flow rate and head, a significant decrease in efficiency, and noticeable noise and vibration. In severe cases, it can lead to pump overheating, jamming, or even leakage, affecting the safe and stable operation of the entire liquid hydrogen delivery system. To address these issues, a submersible liquid hydrogen pump impeller anti-cavitation device is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an anti-cavitation device for the impeller of an immersion liquid hydrogen pump, which aims to improve the problem of cavitation caused by abnormal impeller inlet pressure during liquid hydrogen transportation in the prior art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an anti-cavitation device for an immersion liquid hydrogen pump impeller, comprising a fixed cylinder, wherein a pressure reducing mechanism and a water flow regulating mechanism are provided inside the fixed cylinder, the pressure reducing mechanism includes an impeller, a conveying column is fixedly connected to the outer wall of the impeller, a conveying impeller is fixedly connected to the outer wall of the conveying column, a fixed bracket is rotatably connected to the outer wall of the conveying column, a water outlet pipe is fixedly connected to the outer wall of the fixed cylinder, a water inlet pipe is fixedly connected to the outer wall of the fixed bracket, a high-pressure conveying hole is opened on the outer wall of the fixed cylinder, a conveying cylinder is fixedly connected to the outer wall of the fixed cylinder, a one-way ring is fixedly connected to the inner wall of the conveying cylinder, and a high-pressure input hole is opened on the outer wall of the fixed cylinder.

[0007] As a further description of the above technical solution: The pressure reducing mechanism also includes a fixed housing, on the inner wall of which a motor is fixedly connected, and the output shaft of the motor is fixedly connected to the inner wall of the impeller.

[0008] As a further description of the above technical solution: The outer wall of the impeller is rotatably connected to the inner wall of the fixed cylinder.

[0009] As a further description of the above technical solution: The side wall of the fixed shell is fixedly connected to the side wall of the conveying cylinder.

[0010] As a further description of the above technical solution: The water flow regulating mechanism includes a fixed cylinder II. A knob is rotatably connected to the inner wall of the fixed cylinder II. A worm gear is fixedly connected to the side wall of the knob. A worm wheel is meshed with the outer wall of the worm gear. A pressing block is fixedly connected to the inner wall of the worm wheel. A connecting column is slidably connected to the inner wall of the pressing block. A baffle is fixedly connected to the side wall of the connecting column. An annular shell is slidably connected to the outer wall of the baffle. A U-shaped frame is fixedly connected to the inner wall of the fixed cylinder II. The inner wall of the U-shaped frame is slidably connected to the outer wall of the connecting column.

[0011] As a further description of the above technical solution: The inner wall of the second fixed cylinder is fixedly connected to the outer wall of the fixed cylinder, and the inner wall of the second fixed cylinder is fixedly connected to the outer wall of the water inlet pipe.

[0012] As a further description of the above technical solution: The outer wall of the fixed cylinder is rotatably connected to the inner wall of the extrusion block.

[0013] As a further description of the above technical solution: The water flow regulating mechanism also includes a fixed outer shell, the inner wall of which is fixedly connected to the outer wall of the fixed cylinder, and the outer wall of the baffle abuts against the outer wall of the conveying column.

[0014] This utility model has the following beneficial effects: 1. In this utility model, the pressure reducing mechanism drives the impeller and the conveying column to rotate synchronously through the motor. The conveying impeller reduces the turbulence of liquid hydrogen, the fixed bracket ensures the stability of the conveying column, and the one-way ring guides the high-pressure liquid hydrogen back to the inlet side of the fixed cylinder to replenish the pressure. This suppresses the generation of bubbles from the source, avoids impeller damage, ensures continuous liquid hydrogen flow, maintains stable pump flow and head, reduces noise and vibration, and prevents pump failure.

[0015] 2. In this utility model, the water flow regulating mechanism drives the baffle to move radially through components such as knobs, worm gears, and worm wheels, precisely adjusting the liquid hydrogen flow cross section and flow rate. Combined with the high-pressure return pressure balance of the pressure reducing mechanism, the dual action suppresses bubble generation, avoids impeller cavitation damage, is suitable for low temperature and high pressure working conditions, has a compact structure and no easily damaged sealing components, and the mechanical adjustment is suitable for different conveying needs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of an anti-cavitation device for an immersion liquid hydrogen pump impeller proposed in this utility model. Figure 2 This is a schematic diagram of the fixing cylinder of an anti-cavitation device for an immersion liquid hydrogen pump impeller proposed in this utility model; Figure 3 This is a schematic diagram of the fixed housing of an anti-cavitation device for an immersion liquid hydrogen pump impeller proposed in this utility model.

[0017] Legend: 1. Fixed cylinder one; 2. Pressure reducing mechanism; 211. Conveying cylinder; 212. Fixed shell; 213. Motor; 214. Impeller; 215. One-way ring; 216. High-pressure conveying port; 217. High-pressure input port; 218. Conveying blade; 219. Conveying column; 220. Fixed bracket; 221. Inlet pipe; 222. Outlet pipe; 3. Water flow regulating mechanism; 311. Knob; 312. Worm gear; 313. Worm wheel; 314. Extrusion block; 315. Connecting column; 316. Baffle; 317. Recurved frame; 318. Ring shell; 319. Fixed cylinder two; 320. Fixed outer shell. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figures 1-3This utility model provides an embodiment of an anti-cavitation device for an immersion liquid hydrogen pump impeller, comprising a fixed cylinder 1. The fixed cylinder 1 contains a pressure-reducing mechanism 2 and a water flow regulating mechanism 3. The pressure-reducing mechanism 2 includes an impeller 214, which rotates at high speed along the inner wall of the fixed cylinder 1 to generate suction, drawing liquid hydrogen from the inlet pipe 221. Simultaneously, it drives a conveying column 219 to rotate synchronously. The conveying column 219 is fixedly connected to the outer wall of the impeller 214. The conveying column 219 rotates with the impeller 214, driving a conveying impeller 218 to guide the flow of liquid hydrogen. This also serves as a mechanism for regulating the water flow 3. Baffle 316 provides a base for contact. A conveying impeller 218 is fixedly connected to the outer wall of the conveying column 219. The conveying impeller 218 is fixed to the outer wall of the conveying column 219 to guide the orderly flow of liquid hydrogen, reduce water flow turbulence and disturbance, and lower the risk of sudden local pressure changes. A fixed bracket 220 is rotatably connected to the outer wall of the conveying column 219, providing rotational support to prevent the conveying column 219 from shifting during high-speed rotation and ensuring a stable liquid hydrogen flow path. A water outlet pipe 222 is fixedly connected to the outer wall of the fixed cylinder 1, serving as a liquid hydrogen output channel to reduce pressure. Stable liquid hydrogen output completes the transportation process. A water inlet pipe 221 is fixedly connected to the outer wall of the fixed support 220, serving as a liquid hydrogen input channel to guide external liquid hydrogen into the fixed cylinder 1. Its flow cross-section is adjustable via a baffle 316 to accommodate different transportation needs. A high-pressure delivery hole 216 is provided on the outer wall of the fixed cylinder 1, allowing high-pressure liquid hydrogen from inside the fixed cylinder 1 to flow into the delivery cylinder 211, providing a channel for pressure reflux. A delivery cylinder 211 is fixedly connected to the outer wall of the fixed cylinder 1. The fixed shell 212 guides the high-pressure liquid hydrogen back to the inlet side of the fixed cylinder 1, balancing the inlet pressure and suppressing bubble generation. A one-way ring 215 is fixedly connected to the inner wall of the conveying cylinder 211. The one-way ring 215 is fixed to the inner wall of the conveying cylinder 211, allowing liquid hydrogen to flow unidirectionally from the fixed cylinder 1 to the inlet side, avoiding reverse interference from the backflowing liquid hydrogen and ensuring the pressure balance effect. A high-pressure input hole 217 is opened on the outer wall of the fixed cylinder 1, allowing the high-pressure liquid hydrogen in the conveying cylinder 211 to flow back to the inlet side of the fixed cylinder 1 to replenish the inlet pressure. Reference Figures 1-3 The pressure reducing mechanism 2 also includes a fixed shell 212, which fixes the motor 213 and provides protection, and provides stable support for the connection between the output shaft of the motor 213 and the impeller 214, ensuring accurate power transmission. The motor 213 is fixedly connected to the inner wall of the fixed shell 212. The motor 213 provides the core power for liquid hydrogen transportation, driving the impeller 214 and the conveying column 219 to rotate at high speed. The output shaft of the motor 213 is fixedly connected to the inner wall of the impeller 214, the outer wall of the impeller 214 is rotatably connected to the inner wall of the fixed cylinder 1, and the side wall of the fixed shell 212 is fixedly connected to the side wall of the conveying cylinder 211. Reference Figures 1-3The water flow regulating mechanism 3 includes a fixed cylinder 319, which carries components such as the worm gear 312, worm wheel 313, and extrusion block 314, providing installation and movement space for the flow rate regulating structure. A knob 311 is rotatably connected to the inner wall of the fixed cylinder 319, providing a manual operation interface for flow rate regulation. The knob 311 drives the worm gear 312 to rotate. The worm gear 312 is fixedly connected to the side wall of the knob 311, and the worm gear 312 is fixedly connected to the knob 311, meshing to drive the worm wheel 313 to rotate, transmitting the rotational power of the knob 311 to the extrusion block 314, thus realizing the reversal of the power direction. A worm gear 313 is meshed with the outer wall, and the worm gear 313 meshes with the worm 312, driving the extrusion block 314 to rotate along the inner wall of the fixed cylinder 319, connecting the power transmission between the worm 312 and the extrusion block 314. The extrusion block 314 is fixedly connected to the inner wall of the worm gear 313, and the extrusion block 314 rotates with the worm gear 313, pushing the connecting column 315 to slide through the inclined surface, converting the rotational power into the radial movement force of the connecting column 315. The connecting column 315 is slidably connected to the inner wall of the extrusion block 314, and the connecting column 315 connects the extrusion block 314 and the baffle 316, transmitting the thrust of the extrusion block 314, driving the baffle 316 along the annular shell 318. Radial movement adjusts the flow cross-section. A baffle 316 is fixedly connected to the side wall of the connecting column 315. The baffle 316 moves radially along the inner wall of the annular shell 318, adjusting the liquid hydrogen flow cross-section of the inlet pipe 221 by its contact with the outer wall of the conveying column 219, thus precisely regulating the inlet flow rate. The annular shell 318 is slidably connected to the outer wall of the baffle 316, limiting the sliding trajectory of the baffle 316 to ensure smooth radial movement and precise flow rate adjustment. A U-shaped frame 317 is fixedly connected to the inner wall of the fixed cylinder 319, limiting the sliding direction of the connecting column 315. To prevent the connecting column 315 from shifting and causing the baffle 316 to fail to adjust, the inner wall of the loop frame 317 is slidably connected to the outer wall of the connecting column 315. The inner wall of the second fixed cylinder 319 is fixedly connected to the outer wall of the first fixed cylinder 1. The inner wall of the second fixed cylinder 319 is fixedly connected to the outer wall of the water inlet pipe 221. The outer wall of the second fixed cylinder 319 is rotatably connected to the inner wall of the extrusion block 314. The water flow regulating mechanism 3 also includes a fixed outer shell 320. The fixed outer shell 320 provides protection and fixed support for the second fixed cylinder 319, ensuring the overall structure of the water flow regulating mechanism 3 is stable and does not affect the liquid hydrogen flow path. The inner wall of the fixed outer shell 320 is fixedly connected to the outer wall of the second fixed cylinder 319.

[0020] Working principle: The motor 213 inside the fixed housing 212 starts, and the output shaft drives the impeller 214 to rotate at high speed along the inner wall of the fixed cylinder 1. The rotation of the impeller 214 generates suction, drawing liquid hydrogen from the inlet pipe 221 into the fixed cylinder 1. The impeller 214 drives the conveying column 219 to rotate synchronously. The conveying blades 218 on the outer wall of the conveying column 219 further guide the flow of liquid hydrogen, reducing water flow turbulence and reducing local pressure changes caused by turbulence. The fixed bracket 220 provides stable support for the conveying column 219 to prevent it from shifting during rotation. When the impeller 214 rotates at high speed... High pressure is generated in a certain area inside the fixed cylinder 1. High-pressure liquid hydrogen enters the conveying cylinder 211 through the high-pressure conveying port 216. The one-way ring 215 on the inner wall of the conveying cylinder 211 only allows liquid hydrogen to flow in one direction, avoiding backflow interference. The high-pressure liquid hydrogen is guided by the conveying cylinder 211 and flows back to the inlet side of the fixed cylinder 1 through the high-pressure input port 217 to replenish the liquid hydrogen pressure at the inlet side. This prevents the pressure at the impeller 214 inlet from falling below the saturated vapor pressure of liquid hydrogen due to excessive suction, thus suppressing bubble formation at the source. Finally, the liquid hydrogen with stable pressure is output through the outlet pipe 222, completing the delivery process. Rotating the knob 311 inside the fixed cylinder 319 drives the worm gear 312 to rotate. The worm gear 312 engages with and drives the worm wheel 313. The worm wheel 313 drives the extrusion block 314 to rotate along the inner wall of the fixed cylinder 319. When the extrusion block 314 rotates, its inclined surface pushes the connecting column 315 to slide along the inner wall of the U-shaped frame 317. The connecting column 315 drives the baffle 316 to move radially along the inner wall of the annular shell 318. The baffle 316 abuts against the outer wall of the conveying column 219. By adjusting the obstruction of the baffle 316... The area is changed to alter the liquid hydrogen flow cross-section of the inlet pipe 221 entering the fixed cylinder 1, thereby precisely adjusting the inlet flow rate. When the liquid hydrogen delivery demand is large, the knob 311 is rotated to move the baffle 316 outward, increasing the flow cross-section, reducing the water flow velocity gradient, and avoiding a sudden drop in pressure due to excessively high local flow velocity. When the delivery volume is small, the baffle 316 is moved inward, reducing the flow cross-section, maintaining stable liquid hydrogen pressure at the inlet side, and avoiding insufficient inlet pressure at the impeller 214 due to insufficient flow.

[0021] The fixed outer casing 320 provides protection and support for the water flow regulating mechanism 3, ensuring the stability of the baffle 316 adjustment process and not affecting the liquid hydrogen flow path. The motor 213 drives the impeller 214 to rotate, and at the same time, the knob 311 of the water flow regulating mechanism 3 is rotated to adjust the position of the baffle 316 according to the liquid hydrogen delivery requirements and set a suitable inlet flow rate. The liquid hydrogen enters the fixed cylinder 1 through the inlet pipe 221 and flows to the outlet pipe 222 under the action of the impeller 214 and the conveying blade 218. The high-pressure liquid hydrogen in the fixed cylinder 1 flows back to the inlet side through the conveying cylinder 211 to balance the pressure fluctuation. The high-pressure return of the pressure reducing mechanism 2 supplements the inlet pressure and avoids local low pressure. The water flow regulating mechanism 3 stabilizes the inlet flow rate and reduces turbulence and pressure change. The dual action inhibits the generation of liquid hydrogen vaporization bubbles and protects the impeller 214 from cavitation damage. It is suitable for the low temperature and high pressure working environment of the submersible liquid hydrogen pump. The structure is compact and has no easily worn sealing parts. The working condition is adapted through mechanical adjustment, taking into account both anti-cavitation effect and delivery efficiency.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A submersible liquid hydrogen pump impeller anti-cavitation device, comprising a fixed cylinder (1), characterized in that: The fixed cylinder (1) is equipped with a pressure reducing mechanism (2) and a water flow regulating mechanism (3). The pressure reducing mechanism (2) includes an impeller (214), a conveying column (219) is fixedly connected to the outer wall of the impeller (214), a conveying blade (218) is fixedly connected to the outer wall of the conveying column (219), a fixed bracket (220) is rotatably connected to the outer wall of the conveying column (219), a water outlet pipe (222) is fixedly connected to the outer wall of the fixed cylinder (1), a water inlet pipe (221) is fixedly connected to the outer wall of the fixed bracket (220), a high-pressure conveying hole (216) is opened on the outer wall of the fixed cylinder (1), a conveying cylinder (211) is fixedly connected to the outer wall of the fixed cylinder (1), a one-way ring (215) is fixedly connected to the inner wall of the conveying cylinder (211), and a high-pressure input hole (217) is opened on the outer wall of the fixed cylinder (1).

2. The anti-cavitation device for an impeller of a submersible liquid hydrogen pump according to claim 1, characterized in that: The pressure reducing mechanism (2) also includes a fixed shell (212), on which a motor (213) is fixedly connected, and the output shaft of the motor (213) is fixedly connected to the inner wall of the impeller (214).

3. The anti-cavitation device for an immersion liquid hydrogen pump impeller according to claim 1, characterized in that: The outer wall of the impeller (214) is rotatably connected to the inner wall of the fixed cylinder (1).

4. The anti-cavitation device for an impeller of a submersible liquid hydrogen pump according to claim 2, characterized in that: The side wall of the fixed shell (212) is fixedly connected to the side wall of the conveying cylinder (211).

5. The anti-cavitation device for an impeller of a submersible liquid hydrogen pump according to claim 1, characterized in that: The water flow regulating mechanism (3) includes a fixed cylinder (319), a knob (311) is rotatably connected to the inner wall of the fixed cylinder (319), a worm gear (312) is fixedly connected to the side wall of the knob (311), a worm wheel (313) is meshed with the outer wall of the worm gear (312), a pressing block (314) is fixedly connected to the inner wall of the worm wheel (313), a connecting column (315) is slidably connected to the inner wall of the pressing block (314), a baffle (316) is fixedly connected to the side wall of the connecting column (315), an annular shell (318) is slidably connected to the outer wall of the baffle (316), a loop frame (317) is fixedly connected to the inner wall of the fixed cylinder (319), and the inner wall of the loop frame (317) is slidably connected to the outer wall of the connecting column (315).

6. The anti-cavitation device for an impeller of a submersible liquid hydrogen pump according to claim 5, characterized in that: The inner wall of the second fixed cylinder (319) is fixedly connected to the outer wall of the first fixed cylinder (1), and the inner wall of the second fixed cylinder (319) is fixedly connected to the outer wall of the inlet pipe (221).

7. The anti-cavitation device for an impeller of a submersible liquid hydrogen pump according to claim 5, characterized in that: The outer wall of the fixed cylinder (319) is rotatably connected to the inner wall of the extrusion block (314).

8. The anti-cavitation device for an impeller of a submersible liquid hydrogen pump according to claim 5, characterized in that: The water flow regulating mechanism (3) also includes a fixed outer shell (320), the inner wall of the fixed outer shell (320) is fixedly connected to the outer wall of the fixed cylinder (319), and the outer wall of the baffle (316) abuts against the outer wall of the conveying column (219).

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