Explosion-proof liquid hydrogen pump with high safety

Abstract

The invention belongs to the related technical field of liquid hydrogen pumps, and particularly relates to a high-safety explosion-proof liquid hydrogen pump which comprises a working cavity, a main shaft is rotationally connected to the middle of the interior of the working cavity, one end of the main shaft penetrates through the other end of the working cavity and is fixedly connected with a fluted disc, and a driving assembly is arranged on one side of the fluted disc; the driving assembly comprises a sliding rail, a sliding groove is formed in the sliding rail, a driving motor is arranged in the sliding groove, a shell of the driving motor is slidably connected into the sliding groove, the output end of the driving motor is fixedly connected with driving teeth, and the driving teeth can be meshed with the fluted disc and drive the main shaft to rotate. The driving motor drives the main shaft and the driving teeth to quickly move, so that the driving teeth are separated from the fluted disc, the fluted disc immediately loses driving force, and the fluted disc and the main shaft can quickly stop running; and more liquid hydrogen in the working cavity can permeate out of the crack, so that greater harm can be caused.

Description

Technical Field

[0001] This invention belongs to the technical field of liquid hydrogen pumps, specifically relating to a highly safe explosion-proof liquid hydrogen pump. Background Technology

[0002] A liquid hydrogen pump is a cryogenic pump specifically designed for transporting liquid hydrogen. It is used to extract and pressurize liquid hydrogen from storage tanks at low temperatures (-253°C, approximately 20K). Considering the dangers of liquid hydrogen, if it leaks during transport, it will rapidly absorb heat to form a high concentration of hydrogen gas. If the hydrogen gas diffuses into the air and comes into contact with an open flame or electrical spark, it can easily cause an explosion.

[0003] Liquid hydrogen leaks typically occur at the rotating connection points of the liquid hydrogen pump, specifically at the connection between the pump's main shaft and its outer cylinder. The main shaft, in prolonged contact with liquid hydrogen, is prone to hydrogen embrittlement, leading to brittleness and even cracking. Upon cracking, high-pressure liquid hydrogen seeps out through the crack, causing a leak and potentially triggering an explosion. Therefore, a liquid hydrogen pump is needed that can promptly detect leaks and take immediate action to prevent an explosion. Summary of the Invention

[0004] In response to one or more of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a highly safe explosion-proof liquid hydrogen pump. The drive motor can drive the main shaft and drive teeth to move rapidly, so that the drive teeth disengage from the toothed disc, the toothed disc immediately loses driving force, and the toothed disc and the main shaft can stop running quickly. If the power to control the drive is cut off, the drive motor will rotate at high speed, and the rotor has inertia. After the power is cut off, the drive toothed disc will continue to rotate, and more liquid hydrogen will seep out from the crack inside the working chamber, causing greater damage.

[0005] To achieve the above objectives, the present invention provides a highly safe explosion-proof liquid hydrogen pump, comprising a working chamber, an inlet at one end of the working chamber, an outlet on the outer ring of the working chamber, a main shaft rotatably connected to the center of the working chamber, a plurality of impellers evenly arranged on the outer ring of the main shaft, one end of the main shaft passing through the other end of the working chamber and fixedly connected to a gear disc, and a drive assembly provided on one side of the gear disc;

[0006] The drive assembly includes a slide rail with a groove. A drive motor is installed in the groove. The housing of the drive motor is slidably connected in the groove, and the output end of the drive motor is fixedly connected to drive teeth. The drive teeth can mesh with the gear plate and drive the main shaft to rotate.

[0007] As a further improvement of the present invention, a drive component is also provided on the other side of the toothed disk, and the drive components on both sides of the toothed disk are symmetrically arranged.

[0008] As a further improvement of the present invention, a disc body is coaxially fixed on the main shaft. The disc body is located between the gear disc and the working cavity. Two pressure plates are symmetrically arranged at the center of the outer ring of the disc body. Each pressure plate includes an arc-shaped part and a horizontal part. The arc-shaped part and the horizontal part of each pressure plate are rotatably connected to the working cavity. A torsion spring is provided at the rotatable connection point between the pressure plate and the working cavity.

[0009] Each of the arc-shaped portions is located close to the outer ring of the disc body. Each horizontal portion has a wedge-shaped block at its end. The two wedge-shaped blocks are arranged symmetrically at the center. Each wedge-shaped block has a guide shell on one side of its inclined surface. The guide shell is fixed to the working cavity. An extrusion block is provided inside the guide shell. The end of the extrusion block is rotatably connected to the shaft of the drive teeth.

[0010] As a further improvement of the present invention, a pressure plate is provided between the disc body and the gear disc, the main shaft is provided through the middle of the pressure plate, and extension plates are provided on both sides of the pressure plate. The extension plates are rotatably connected to the outer ring of the shaft of the drive gear.

[0011] As a further improvement of the present invention, each of the driving components is provided with a nitrogen supply component on one side, and each nitrogen supply component includes a driven tooth. The output shaft of the driven tooth is fixed to the input end of the liquid nitrogen pump. The end shell of the liquid nitrogen pump is provided with a nitrogen storage tank and a discharge pipe. The discharge pipe is connected to a main shaft that is hollow in shape, and multiple liquid outlet holes are opened on the outer ring of the main shaft.

[0012] As a further improvement of the present invention, the working chamber includes an outer explosion-proof shell and an inner working cylinder; the explosion-proof shell includes an inner shell and an outer shell, a primary cavity is provided between the inner shell and the working cylinder, a secondary cavity is provided between the inner shell and the outer shell, and the secondary cavity is connected to the primary cavity.

[0013] As a further improvement of the present invention, an early warning component is provided between the primary cavity and the primary cavity. The early warning component includes a sleeve, the lower outer ring of which is fixed to the inner shell and communicates with the primary cavity. A top tube is provided inside the sleeve, and a diaphragm is fixed to the lower end of the top tube. The edge of the diaphragm is fixed to the inner surface of the inner shell. An overflow hole is radially opened on the outer surface of the top tube. A through hole is radially opened in the sleeve.

[0014] The top of the sleeve is equipped with an L-shaped conductive plate. A sliding hole is opened on the horizontal plate of the conductive plate, and a conductive brush is installed in the sliding hole. The vertical plate of the conductive plate is connected to an alarm installed on the top of the sleeve through a wire.

[0015] As a further improvement of the present invention, a limiting plate is provided above the horizontal plate of the conductive plate, and the limiting plate is electrically connected to all the solenoid valves installed on the discharge pipe.

[0016] As a further improvement of the present invention, a trumpet-shaped annular isolation membrane is provided between the top tube and the sleeve, the inner ring of the annular isolation membrane is fixed to the outer ring of the top tube, and the outer edge of the annular isolation membrane is fixed to the inner sidewall of the sleeve.

[0017] As a further improvement of the present invention, the drive tooth is provided with a protective cover, which extends to the driven tooth position and is fixed to the liquid nitrogen pump end shell.

[0018] In summary, the technical solutions conceived by this invention have the following beneficial effects compared with the prior art:

[0019] (1) In the liquid hydrogen pump of the present invention, the drive motor drives the main shaft and drive teeth to move rapidly, so that the drive teeth disengage from the toothed disc, the toothed disc immediately loses driving force, and the toothed disc and the main shaft can stop running quickly. If the power to control the drive is cut off, the drive motor rotates at high speed, and the rotor has inertia. After the power is cut off, the drive toothed disc will still rotate, and more liquid hydrogen will seep out from the crack inside the working chamber, causing greater damage.

[0020] (2) In the liquid hydrogen pump of the present invention, the drive gear moves linearly with the drive motor and disengages from the gear disc. At the same time, the rotating shaft drives the extrusion block to extend out from the guide shell. The inclined surface of the extrusion block presses against the inclined surface of the wedge block. At the same time, the wedge block drives the pressure plate to deflect. The arc-shaped part of the pressure plate presses against the outer ring of the disc. By relying on the friction between the arc-shaped part and the disc, the disc is braked and stopped. The main shaft can be stopped immediately and the rotation can be stopped quickly, thereby reducing the amount of liquid hydrogen permeation and improving safety. Attached Figure Description

[0021] Figure 1 This is a first-view perspective perspective view of the liquid hydrogen pump in an embodiment of the present invention;

[0022] Figure 2 This is a second-view perspective perspective view of the liquid hydrogen pump in an embodiment of the present invention;

[0023] Figure 3 This is a top view of the liquid hydrogen pump in an embodiment of the present invention;

[0024] Figure 4 This is the first front view of the liquid hydrogen pump in an embodiment of the present invention;

[0025] Figure 5 This is a perspective view of the engagement between the toothed disc and the pressure plate in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the engagement between the toothed disc and the pressure plate in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the cooperation between the pressure plate and the disc body in an embodiment of the present invention;

[0028] Figure 8 This is a cross-sectional view of the working cavity in an embodiment of the present invention;

[0029] Figure 9 This is a perspective view of the jacking pipe in an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the cooperation between the top tube and the conductive plate in an embodiment of the present invention.

[0031] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Working chamber; 2. Inlet; 3. Outlet; 4. Main shaft; 5. Impeller; 6. Gear disc; 7. Slide rail; 8. Slide groove; 9. Drive motor; 10. Drive gear; 11. Disc body; 12. Pressure plate; 13. Arc-shaped part; 14. Horizontal part; 15. Torsion spring; 16. Wedge block; 17. Guide shell; 18. Extrusion block; 19. Rotating shaft; 20. Pressure disc; 21. Extension plate; 22. Driven gear; 2 3. Liquid nitrogen pump; 24. Nitrogen storage tank; 25. Discharge pipe; 26. Liquid outlet; 27. Air slip ring; 28. Explosion-proof shell; 29. ​​Working cylinder; 30. Inner shell; 31. Outer shell; 32. Primary cavity; 33. Secondary cavity; 34. Sleeve; 35. Top pipe; 36. Diaphragm; 37. Overflow hole; 38. Through hole; 39. Conductive plate; 40. Sliding hole; 41. Conductive brush; 42. Alarm; 43. Limiting plate; 44. Solenoid valve; 45. Annular isolation diaphragm; 46. Protective cover. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Reference Figure 1 - Figure 8 A high-safety explosion-proof liquid hydrogen pump includes a working chamber 1, an inlet 2 at one end of the working chamber 1, an outlet 3 on the outer ring of the working chamber 1, a main shaft 4 rotatably connected to the center of the working chamber 1, a plurality of impellers 5 evenly arranged on the outer ring of the main shaft 4, one end of the main shaft 4 passing through the other end of the working chamber 1 and fixedly connected to a gear disk 6, a drive assembly on one side of the gear disk 6; the drive assembly includes a slide rail 7, a slide groove 8 opened on the slide rail 7, a drive motor 9 installed in the slide groove 8, a housing 31 of the drive motor 9 slidably connected in the slide groove 8, and a drive tooth 10 fixedly connected to the output end of the drive motor 9, the drive tooth 10 being able to mesh with the gear disk 6 and drive the main shaft 4 to rotate;

[0035] In this embodiment of the invention, the slide 8 is equipped with an actuator for controlling the linear motion of the drive motor 9. This actuator can be a lead screw, which is threaded to the bottom of the end housing of the drive motor 9. The end of the lead screw is connected to a servo motor, which is controlled by a PLC to realize the movement of the drive motor 9. Multiple hydrogen sensors are set at the rotational connection position between the working chamber 1 and the main shaft 4. Each hydrogen sensor is connected to the PLC, and when each hydrogen sensor detects hydrogen, it can transmit the leakage information to the PLC in the form of an analog signal. Then, the PLC immediately controls the servo motor to rotate, driving the drive motor 9 to move. However, the drive motor 9 is not immediately de-energized. Instead, the drive motor 9 drives the main shaft 4 and the drive gear 10 to move rapidly, causing the drive gear 10 to disengage from the gear disk 6. The gear disk 6 immediately loses its driving force, and the gear disk 6 and the main shaft 4 can quickly stop operating. If the power to control the drive is de-energized, the drive motor 9 will rotate at high speed, and the rotor has inertia. After the power is de-energized, the drive gear 10 will continue to rotate on the gear disk 6. More liquid hydrogen will seep out from the crack inside the working chamber 1, causing greater damage.

[0036] The working principle between the drive component, actuator, and gear 6 is similar to that of a car engine starter. Under the drive of the electromagnet inside the starter, the starter gear extends and meshes with the flywheel of the car engine to ignite the car. Afterward, the gear immediately retracts and resets under the drive of the electromagnet. In this embodiment, the drive gear 10 moves backward with the drive motor 9 and disengages from the gear 6. After the leakage problem is resolved, the drive gear 10 resets and meshes with the gear 6. The meshing action of the drive gear 10 and the gear 6 is the same as the working principle of the starter and flywheel.

[0037] Reference Figure 1 - Figure 4 The other side of the toothed disk 6 is also provided with a drive assembly, and the drive assemblies on both sides of the toothed disk 6 are symmetrically arranged.

[0038] Drive components are provided on both sides of the gear disk 6. The gear disk 6 meshes symmetrically with two drive teeth 10. First, it can provide stronger driving force for the rotation of the main shaft 4 and the impeller 5, so that the liquid hydrogen pump can operate stably. At the same time, the gear disk 6 is symmetrically driven on both sides, and the pressure between the outer ring of the main shaft 4, the working chamber 1 and the sealing material is more uniform, which can reduce wear and thus effectively extend the normal service life of the main shaft 4.

[0039] Reference Figure 1 - Figure 7 A disc body 11 is coaxially fixed to the main shaft 4. The disc body 11 is located between the gear disc 6 and the working cavity 1. Two pressure plates 12 are symmetrically arranged at the center of the outer ring of the disc body 11. Each pressure plate 12 includes an arc-shaped part 13 and a horizontal part 14. The arc-shaped part 13 and the horizontal part 14 of each pressure plate 12 are rotatably connected to the working cavity 1. A torsion spring 15 is provided at the rotatable connection point between the pressure plate 12 and the working cavity 1.

[0040] Each of the arc-shaped portions 13 is located near the outer ring of the disc body 11. Each horizontal portion 14 has a wedge block 16 at its end. The two wedge blocks 16 are arranged in a centrally symmetrical manner. Each wedge block 16 has a guide shell 17 on one side of its inclined surface. The guide shell 17 is fixed to the working cavity 1. An extrusion block 18 is provided inside the guide shell 17. The end of the extrusion block 18 is rotatably connected to the rotating shaft 19 of the drive tooth 10.

[0041] The drive gear 10 moves linearly with the drive motor 9 and disengages from the gear disk 6. At the same time, the rotating shaft 19 drives the extrusion block 18 to extend from the guide shell 17. The inclined surface of the extrusion block 18 presses against the inclined surface of the wedge block 16. Meanwhile, the wedge block 16 drives the pressure plate 12 to deflect. The arc-shaped part 13 of the pressure plate 12 presses against the outer ring of the disk body 11. Relying on the friction between the arc-shaped part 13 and the disk body 11, the disk body 11 is braked and stopped. This can immediately stop the rotation of the main shaft 4, thus quickly controlling the rotation of the impeller 5, thereby reducing the amount of liquid hydrogen permeation and improving safety.

[0042] When the drive gear 10 is reset, the rotating shaft 19 pushes the compression block 18 into the guide shell 17. Under the torque of the torsion spring 15 connected to it, the pressure plate 12 quickly disengages from the disc body 11 and stops compressing the disc 20 body 11. At the same time, the drive gear 10 also meshes with the gear disc 6, and the liquid hydrogen pump can continue to operate.

[0043] Reference Figure 1 - Figure 6 A pressure plate 20 is provided between the disc body 11 and the gear disc 6. The main shaft 4 passes through the middle of the pressure plate 20. Extension plates 21 are provided on both sides of the pressure plate 20. The extension plates 21 are rotatably connected to the outer ring of the rotating shaft 19 of the drive gear 10.

[0044] A pressure plate 20 is set up in conjunction with a pressure plate 12 to further brake the main shaft 4. Specifically, extension plates 21 are fixed to both sides of the pressure plate 20. The extension plates 21 are rotatably connected to the outer ring of the main shaft 4 and can also move linearly with the rotating shaft 19. When the rotating shaft 19 and the drive gear 10 retract and disengage from the gear plate 6, the rotating shaft 19 drives the pressure plate 20 to move through the extension plates 21. The pressure plate 20 presses against the surface of the gear plate 6. Relying on the friction between the pressure plate 20 and the gear plate 6, the gear plate 6 is stopped. At this time, the main shaft 4 is stopped under the action of double braking. When the gear plate 6 loses the driving force of the drive gear 10, the main shaft 4 can stop operating immediately, further reducing the leakage of liquid hydrogen.

[0045] Reference Figure 1 - Figure 4Each of the drive components has a nitrogen supply component on one side, and each nitrogen supply component includes a driven gear 22. The output shaft of the driven gear 22 is fixed to the input end of the liquid nitrogen pump 23. The end shell of the liquid nitrogen pump 23 is provided with a nitrogen storage tank 24 and a discharge pipe 25. The discharge pipe 25 is connected to a hollow main shaft 4, and the outer ring of the main shaft 4 has multiple liquid outlet holes 26. The end of the discharge pipe 25 is connected to a slip ring 27, which enables the discharge pipe 25 to rotate with the main shaft 4, and the discharge pipe 25 to communicate with the hollow part inside the main shaft 4.

[0046] After the drive gear 10 moves backward with the drive motor 9, the gear plate 6 loses driving force, and the double brakes stop the main shaft 4. At the same time, the drive gear 10 retracts and meshes with the driven gear 22. The driven gear 22 is connected to the liquid nitrogen pump 23, which can drive the liquid nitrogen pump 23 to run and inject the liquid nitrogen in the liquid nitrogen tank into the hollow part of the main shaft 4. The liquid nitrogen is discharged from multiple outlet holes 26 and flows quickly into the working chamber 1, diluting the liquid hydrogen in the working chamber 1 and reducing the risk of explosion.

[0047] Reference Figure 8 - Figure 10 The working chamber 1 includes an outer explosion-proof shell 28 and an inner working cylinder 29; the explosion-proof shell 28 includes an inner shell 30 and an outer shell 31, a primary cavity 32 is left between the inner shell 30 and the working cylinder 29, a secondary cavity 33 is left between the inner shell 30 and the outer shell 31, and the secondary cavity 33 is connected to the primary cavity 32.

[0048] The main shaft 4 is rotatably connected to the working cylinder 29, and the rotatable connection is filled with sealing material. The main shaft 4 is also rotatably connected to the explosion-proof shell 28 and the working cylinder 29, and the rotatable connection is also filled with sealing material. Multiple hydrogen sensors are installed on the inner wall of the working cylinder 29. When hydrogen is detected, the drive gear 10 first disengages from the gear plate 6. When the gear plate 6 loses driving force and brakes and stops, there is still pressure in the working cylinder 29. This pressure will cause liquid hydrogen to continue to leak, and the subsequently leaked liquid hydrogen will flow into the primary chamber 32. The liquid hydrogen absorbs the heat of the primary chamber 32 and turns into hydrogen gas. The pressure in the primary chamber 32 increases, causing the hydrogen gas to flow into the secondary chamber 33. At this time, both the primary chamber 32 and the secondary chamber 33 play a buffering role to buffer the pressure. Then, the liquid nitrogen pump 23 pumps liquid nitrogen into the working cylinder 29 and the primary chamber 32 to dilute the liquid gas and reduce the risk of explosion.

[0049] Reference Figure 8 - Figure 10An early warning component is provided between the primary cavity 32 and the primary cavity 32. The early warning component includes a sleeve 34. The lower outer ring of the sleeve 34 is fixed to the inner shell 30 and communicates with the primary cavity 32. A top tube 35 is provided inside the sleeve 34. A diaphragm 36 is fixed to the lower end of the top tube 35. The edge of the diaphragm 36 is fixed to the inner surface of the inner shell 30. An overflow hole 37 is radially opened on the outer surface of the top tube 35. A through hole 38 is radially opened in the sleeve 34.

[0050] The sleeve 34 has an L-shaped conductive plate 39 at the top. A sliding hole 40 is opened on the horizontal plate of the conductive plate 39. A conductive brush 41 is provided in the sliding hole 40. The vertical plate of the conductive plate 39 is connected to an alarm 42 at the top of the sleeve 34 through a wire.

[0051] The alarm component is a physically driven alarm. Specifically, when the primary chamber 32 is filled with hydrogen, the increased pressure in the primary chamber 32 pushes the diaphragm 36, which in turn pushes the top tube 35 upward. As the top tube 35 moves upward, its upper end extends into the sliding hole 40. An external wire connected to the top tube 35 makes electrical contact with the conductive brush 41 inside the sliding hole 40, thereby closing the circuit of the alarm 42. The alarm 42 then sounds an alarm, warning that the liquid hydrogen leakage has exceeded a threshold, such as exceeding a safety limit. At a minimum, safety personnel can issue safety warnings and evacuate on-site staff based on the hazard, serving as an audible and visual warning. Simultaneously, in conjunction with a hydrogen sensor, the safety of the liquid hydrogen pump operation is ensured. When the jacking pipe 35 moves upward, the overflow hole 37 on the outer surface of the jacking pipe 35 connects with the through hole 38 on the sleeve 34, thus connecting the primary chamber 32 with the secondary chamber. The hydrogen in the primary chamber 32 flows sequentially along the overflow hole 37 and the through hole 38 to the secondary chamber 33, releasing pressure and reducing the possibility of explosion.

[0052] Reference Figure 8 - Figure 10 A limiting plate 43 is provided above the horizontal plate of the conductive plate 39, and the limiting plate 43 is electrically connected to all the solenoid valves 44 installed on the discharge pipe 25.

[0053] When the liquid hydrogen pump is running, the solenoid valve 44 is closed to prevent liquid hydrogen from flowing from the outlet hole 26 into the discharge pipe 25. When the top pipe 35 moves upward and is electrically connected to the limit plate 43, the PLC controls the solenoid valve 44 to open, and at the same time the liquid nitrogen pump 23 injects liquid nitrogen into the discharge pipe 25 and enters the working chamber 1.

[0054] Reference Figure 8 - Figure 10 A funnel-shaped annular isolation membrane 45 is provided between the top tube 35 and the sleeve 34. The inner ring of the annular isolation membrane 45 is fixed to the outer ring of the top tube 35, and the outer edge of the annular isolation membrane 45 is fixed to the inner side wall of the sleeve 34.

[0055] The annular isolation membrane 45 is used to physically isolate hydrogen from the conductive brush 41. When the top tube 35 moves upward and comes into contact with the conductive brush 41, there is an electric spark. The annular isolation membrane 45 separates the hydrogen from the electric spark to prevent the electric spark from causing a hydrogen explosion.

[0056] Reference Figure 1 The drive tooth 10 is provided with a protective cover 46, which extends to the position of the driven tooth 22 and is fixed to the end shell of the liquid nitrogen pump 23. The protective cover 46 is provided to protect the drive tooth 10 and the driven tooth 22 and prevent them from being touched by foreign objects, which could cause safety accidents.

[0057] Working principle:

[0058] When liquid hydrogen leaks, the hydrogen sensor detects the hydrogen and transmits the leak information to the PLC as an analog signal. The PLC immediately drives the actuator, which moves the drive motor 9, causing the drive gear 10 to disengage from the gear disk 6. The gear disk 6 immediately loses its driving force. At the same time, the wedge block 16 presses against the pressing block 18, the pressure plate 12 presses against the disk body 11, and the rotating shaft 19 drives the pressure plate 20 to press against the gear disk 6, thus pausing the gear disk 6 and the main shaft 4. The drive gear 10 also meshes with the driven gear 22, driving the liquid nitrogen pump 23 and pumping it into the working chamber 1 to dilute the leaked liquid hydrogen and reduce the risk of explosion.

[0059] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A highly safe explosion-proof liquid hydrogen pump, characterized in that, It includes a working chamber, with an inlet at one end and an outlet on the outer ring of the working chamber. A main shaft is rotatably connected to the center of the working chamber. Multiple impellers are evenly arranged on the outer ring of the main shaft. One end of the main shaft passes through the other end of the working chamber and is fixedly connected to a gear plate. A drive assembly is provided on one side of the gear plate. The drive assembly includes a slide rail with a groove. A drive motor is installed in the groove. The housing of the drive motor is slidably connected in the groove, and the output end of the drive motor is fixedly connected to drive teeth. The drive teeth can mesh with the gear plate and drive the main shaft to rotate.

2. The explosion-proof liquid hydrogen pump with high safety according to claim 1, characterized in that, The other side of the gear disk is also provided with a drive component, and the drive components on both sides of the gear disk are symmetrically arranged.

3. The explosion-proof liquid hydrogen pump with high safety according to claim 1, characterized in that, A disc body is coaxially fixed to the main shaft. The disc body is located between the gear disc and the working cavity. Two pressure plates are symmetrically arranged at the center of the outer ring of the disc body. Each pressure plate includes an arc-shaped part and a horizontal part. The arc-shaped part and the horizontal part of each pressure plate are rotatably connected to the working cavity. A torsion spring is provided at the rotatable connection point between the pressure plate and the working cavity. Each of the arc-shaped portions is located close to the outer ring of the disc body. Each horizontal portion has a wedge-shaped block at its end. The two wedge-shaped blocks are arranged symmetrically at the center. Each wedge-shaped block has a guide shell on one side of its inclined surface. The guide shell is fixed to the working cavity. An extrusion block is provided inside the guide shell. The end of the extrusion block is rotatably connected to the shaft of the drive teeth.

4. The explosion-proof liquid hydrogen pump with high safety according to claim 3, characterized in that, A pressure plate is provided between the disc body and the gear disc. The main shaft passes through the middle of the pressure plate, and extension plates are provided on both sides of the pressure plate. The extension plates are rotatably connected to the outer ring of the shaft of the drive gear.

5. A high-safety explosion-proof liquid hydrogen pump according to claim 2, characterized in that, Each of the drive components has a nitrogen supply component on one side, and each nitrogen supply component includes a driven tooth. The output shaft of the driven tooth is fixed to the input end of the liquid nitrogen pump. The end housing of the liquid nitrogen pump is provided with a nitrogen storage tank and a discharge pipe. The discharge pipe is connected to a hollow main shaft, and multiple liquid outlet holes are opened on the outer ring of the main shaft.

6. The explosion-proof liquid hydrogen pump with high safety according to claim 3, characterized in that, The working chamber includes an outer explosion-proof shell and an inner working cylinder; the explosion-proof shell includes an inner shell and an outer shell, with a primary cavity between the inner shell and the working cylinder, and a secondary cavity between the inner shell and the outer shell, and the secondary cavity is connected to the primary cavity.

7. A high-safety explosion-proof liquid hydrogen pump according to claim 6, characterized in that, An early warning component is provided between the primary cavities. The early warning component includes a sleeve, the lower outer ring of which is fixed to the inner shell and communicates with the primary cavity. A top tube is provided inside the sleeve, and a diaphragm is fixed to the lower end of the top tube. The edge of the diaphragm is fixed to the inner surface of the inner shell. An overflow hole is radially opened on the outer surface of the top tube. A through hole is radially opened in the sleeve. The top of the sleeve is equipped with an L-shaped conductive plate. A sliding hole is opened on the horizontal plate of the conductive plate, and a conductive brush is installed in the sliding hole. The vertical plate of the conductive plate is connected to an alarm installed on the top of the sleeve through a wire.

8. A high-safety explosion-proof liquid hydrogen pump according to claim 7, characterized in that, A limiting plate is provided above the horizontal plate of the conductive plate, and the limiting plate is electrically connected to all the solenoid valves installed on the discharge pipe.

9. A high-safety explosion-proof liquid hydrogen pump according to claim 7, characterized in that, A trumpet-shaped annular isolation membrane is provided between the jacking pipe and the casing. The inner ring of the annular isolation membrane is fixed to the outer ring of the jacking pipe, and the outer edge of the annular isolation membrane is fixed to the inner wall of the casing.

10. A high-safety explosion-proof liquid hydrogen pump according to claim 4, characterized in that, The drive tooth is provided with a protective cover, which extends to the driven tooth position and is fixed to the liquid nitrogen pump end housing.

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