Liquid hydrogen pump with leakage self-detection function

Abstract

The invention provides a liquid hydrogen pump with a leakage self-detection function. The liquid hydrogen pump comprises a driving assembly and a pumping assembly arranged at the output end of the driving assembly. A connecting pipe is arranged at one end of the pumping assembly, and a sealing piece is arranged at the intersection of the connecting pipe and the pumping assembly. The outer surface wall of the sealing piece is sleeved with a leakage detection assembly, the leakage detection assembly comprises a sleeve connected to the outer surface wall of the sealing piece in a sleeving mode, a hydrogen sensor is arranged on the upper surface wall of the sleeve and used for detecting the concentration of hydrogen, and a signal transmission module is arranged on one side of the hydrogen sensor and electrically connected with the hydrogen sensor. The leakage detection assembly is used for receiving a detection signal of the hydrogen sensor and judging whether leakage occurs or not, gas collection bags are arranged in the two ends of the sleeve and used for collecting leaked hydrogen, and the leakage detection assembly can monitor whether leakage occurs in the operation process of the liquid hydrogen pump in real time through the leakage detection assembly, and the leaked hydrogen is collected through the gas collection bags. And therefore, the problems that the leakage detection of the existing liquid hydrogen pump is lagged and the safety is insufficient are solved.

Description

Technical Field

[0001] This invention relates to the field of liquid hydrogen transport equipment, and in particular to a liquid hydrogen pump with self-detection of leaks. Background Technology

[0002] With the increasing global demand for clean energy, liquid hydrogen, as a highly efficient, clean, and high-energy-density energy carrier, is finding increasingly widespread applications in aerospace, energy, transportation, and many other fields. As a core component of liquid hydrogen delivery systems, the liquid hydrogen pump plays a crucial role in pressurizing and transporting liquid hydrogen to designated locations.

[0003] However, the unique physical properties of liquid hydrogen present significant challenges to the design and operation of liquid hydrogen pumps. Liquid hydrogen has an extremely low temperature, requiring pump materials to possess excellent cryogenic performance, and placing extremely high demands on the sealing system. Furthermore, liquid hydrogen is highly permeable; even minute gaps can lead to leakage. Once a liquid hydrogen pump leaks, not only will this valuable energy source be lost, but more seriously, the leaked liquid hydrogen rapidly vaporizes into hydrogen gas, which, when mixed with air, can easily cause an explosion. Additionally, the low temperature of liquid hydrogen can lead to serious safety accidents such as frostbite.

[0004] Currently, existing liquid hydrogen pumps have many shortcomings in terms of sealing and leak detection. Most liquid hydrogen pumps rely solely on traditional sealing components for sealing, lacking effective leak detection methods. This means that during the operation of the liquid hydrogen pump, leaks are often only detected when the leakage reaches a significant level or obvious abnormalities occur, such as pressure changes or temperature anomalies. This lag in detection makes it impossible to take timely measures in the early stages of a leak, increasing safety risks.

[0005] While some liquid hydrogen pumps are equipped with leak detection devices, the principle behind these detection methods poses certain safety risks. These devices typically rely on sensors to detect the concentration of hydrogen in the mixture after leaking hydrogen mixes with air to determine if a leak has occurred. However, this means that the hydrogen must first escape into the air to be detected. During this process, a potential safety threat already exists, especially in locations with extremely high safety requirements, such as space launch sites and large energy storage facilities. In such cases, this detection method could lead to serious safety accidents.

[0006] In summary, existing liquid hydrogen pumps suffer from problems such as delayed detection and insufficient safety in leak detection, failing to meet the growing demand for safe and reliable operation. Therefore, developing a liquid hydrogen pump with self-detection capabilities that can monitor leaks in real time without causing safety hazards during the detection process is of significant practical importance. Summary of the Invention

[0007] To overcome existing problems, this application provides a liquid hydrogen pump with leak self-detection. The leak detection component can monitor whether a leak occurs during the operation of the liquid hydrogen pump in real time, and the leaked hydrogen is collected by the gas collection bag and cannot overflow into the air. This solves the problems of lagging leak detection and insufficient safety of existing liquid hydrogen pumps, improves the reliability and safety of liquid hydrogen pump operation, and is suitable for liquid hydrogen storage, transportation and related industrial conveying scenarios.

[0008] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0009] A liquid hydrogen pump with leak self-detection includes a drive assembly and a pumping assembly disposed at the output end of the drive assembly. The drive assembly is driven to the pumping assembly and is used to drive the pumping assembly to achieve liquid hydrogen delivery.

[0010] The pumping assembly is provided with a connecting pipe at one end, and a sealing element is provided at the intersection of the connecting pipe and the pumping assembly;

[0011] The outer wall of the seal is fitted with a leakage detection component, and both ends of the leakage detection component are provided with connecting components.

[0012] The leak detection assembly includes a sleeve fitted over the outer wall of the seal. The inner diameter of the sleeve is designed according to the outer diameter of the liquid hydrogen pump seal, ensuring that the sleeve size is larger than the seal size so that the sleeve can fit over the outside of the seal. The cross-sectional diameter of the sleeve is larger than that of the seal. The sleeve is made of a low-temperature resistant, high-strength, and airtight metal material. A hydrogen sensor is installed on the upper surface of the sleeve to detect the concentration of hydrogen gas. The hydrogen sensor is based on advanced electrochemical or optical detection principles and can detect extremely low concentrations of hydrogen gas in a very short time. The hydrogen sensor is fixed to the upper surface of the sleeve by a special mounting structure to ensure that its detection probe can fully contact the gas inside the sleeve. A signal transmission module is installed on one side of the hydrogen sensor. The signal transmission module can accurately receive the weak signal output by the hydrogen sensor, amplify and process it, and compare it with a preset leak threshold. If the detection signal exceeds the threshold, the signal transmission module immediately issues a leak alarm signal. The signal transmission module and the hydrogen sensor are connected by a low-temperature cable to ensure the stability and reliability of signal transmission. The signal transmission module employs low-temperature performance electronic components and circuit design, integrating signal amplification, processing, and judgment circuits. It amplifies and processes the output signal of the hydrogen sensor, compares it with a preset leakage threshold, and issues a leakage alarm signal. The signal transmission module is electrically connected to the hydrogen sensor, receiving its detection signal and determining whether a leak has occurred. Both ends of the sleeve are equipped with gas collection bladders to collect leaked hydrogen. These bladders are made of low-temperature resistant, highly elastic, and airtight rubber. When filled with gas, the bladders expand. Each end of the bladder has a sealing hose made of a low-temperature resistant and hydrogen-corrosion-resistant polymer material. The hose's inner diameter matches the interface size of the bladder, and both ends use special sealing connectors to connect to the bladder and related components. The sealing hose is connected to both ends of the sleeve, and its length is cut as needed to prevent twisting or excessive stretching when connecting the sleeve to other components. Special sealing connectors at both ends of the sealing hose ensure a tight seal.

[0013] Preferably, the pumping assembly includes a connecting shaft connected to the shaft. The connecting shaft is made of the same material as the shaft and is manufactured through forging and precision machining. One end of the connecting shaft is connected to the impeller shaft, and the other end is connected to the shaft of the drive assembly. A keyed or splined connection is used to ensure the reliability of power transmission. One end of the connecting shaft is provided with a pump body, and the other end of the pump body is provided with a volute. The volute and the impeller inside it are integrated into a single design. The shape of the volute is optimized according to the flow trajectory of liquid hydrogen in the pump body to improve the flow rate and pressure of liquid hydrogen. The inner wall of the volute is precision machined to reduce the flow loss of liquid hydrogen inside the volute. An outlet pipe is provided above the volute, and an inlet pipe is provided below the volute. An impeller is provided inside the volute. The inlet pipe, outlet pipe, and connecting pipe of the pump body are connected by a sealing element, and the connection part of the sealing element is sealed with a rubber sealing gasket.

[0014] Preferably, the drive assembly includes a base with a shock-absorbing rubber pad or spring at its bottom to reduce the transmission of vibrations generated by the motor body during operation to other components. The upper surface of the base is precision machined to ensure stable installation of the connecting seat. The motor body is located above the base, and a connecting seat is provided at the contact position between the motor body and the base. The external shape of the connecting seat is designed according to the connection requirements of the motor body and the shaft to ensure a tight connection with the motor body and the shaft. The connecting seat and the base are connected by bolts to ensure a firm connection. A shaft is provided at the intersection of the motor body and the pumping assembly. The surface of the shaft is hardened and ground to improve its hardness and smoothness. Both ends of the shaft are machined with keyways or splines that are compatible with the output shaft of the motor body and the connecting shaft of the pumping assembly to ensure reliable power transmission.

[0015] Preferably, the connecting assembly includes a first arc-shaped plate and a second arc-shaped plate. The curvature of the first and second arc-shaped plates is designed according to the outer diameter of the sleeve to ensure that they can tightly surround the sleeve and prevent deformation during fastening. The first and second arc-shaped plates are made of high-strength, low-temperature resistant metal materials with anti-corrosion treatment on the surface. The curvature is adapted to the outer diameter of the sealing hose. The first and second arc-shaped plates are in contact with the leakage detection assembly. A connecting hinge is provided at one end of the first and second arc-shaped plates. The rotating part of the connecting hinge is lubricated and coated with low-temperature grease to ensure flexible rotation in low-temperature environments.

[0016] The second arc-shaped plate has a pressure plate at the end away from the connecting hinge. A hole is provided at the intersection of the pressure plate and the screw to ensure that pressure can be applied evenly when the fastener tightens the screw. The first arc-shaped plate has a screw at the position of the pressure plate. A fastener is screwed onto the outer wall of the screw. The fastener is a high-strength nut, and the screw is a high-strength bolt that matches the nut. The material is low-temperature resistant alloy steel. The length of the screw is determined according to the actual installation requirements to ensure that sufficient tightening force can be provided during the tightening process. The surfaces of the screw and the fastener are treated with rust prevention, such as zinc plating or nickel plating, to improve their corrosion resistance in the liquid hydrogen environment.

[0017] The advantages of the embodiments of this application are:

[0018] 1. A leak detection component is fitted onto the outer wall of the seal of the liquid hydrogen pump. The sleeve is tightly fitted onto the outside of the seal to form a relatively closed space for collecting any leaking hydrogen. A hydrogen sensor is installed on the upper surface of the sleeve to detect the concentration of hydrogen inside the sleeve in real time. A signal transmission module is connected to one side of the hydrogen sensor. This module is electrically connected to the hydrogen sensor and is responsible for receiving the detection signal from the hydrogen sensor. It also uses a built-in algorithm to determine whether the liquid hydrogen pump is leaking. This allows the leak detection component to tightly surround the seal and detect leaking hydrogen as soon as possible, achieving real-time monitoring.

[0019] 2. Gas collection bladders are installed inside both ends of the casing. When liquid hydrogen leaks, the vaporized hydrogen first enters the gas collection bladder and is collected, preventing the hydrogen from directly overflowing into the air. Sealed hoses are connected to both ends of the gas collection bladder to further ensure that the hydrogen does not leak into the external environment. This not only effectively collects the leaked hydrogen but also avoids the safety hazards caused by hydrogen overflow, thus improving the safety of the liquid hydrogen pump operation.

[0020] 3. Connecting components are installed at both ends of the leak detection assembly. The first and second arc-shaped plates are connected by a connecting hinge and can rotate around the hinge axis for easy installation and disassembly. During installation, the first and second arc-shaped plates are wrapped around both ends of the sleeve, and the pressure plate is fixed by screws and fasteners, thereby firmly connecting the leak detection assembly to the relevant parts of the liquid hydrogen pump. This ensures the reliability of the connection and facilitates maintenance and replacement of the leak detection assembly when needed. At the same time, the design of the connecting components can adapt to sleeves of different diameters. By adjusting the tightness of the screws and fasteners, the arc-shaped plates can be made to fit tightly against the sleeve surface, ensuring the sealing and stability of the connection and guaranteeing the long-term stable operation of the leak detection assembly. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of the liquid hydrogen pump with leak self-detection according to the present invention.

[0023] Figure 2 This is a schematic diagram of the overall structure of the pumping component, the leak detection component, and the connecting component in the liquid hydrogen pump with leak self-detection of the present invention.

[0024] Figure 3 This is a schematic diagram of the overall structure connecting the pumping component and the leakage detection component in the liquid hydrogen pump with leakage self-detection of the present invention.

[0025] Figure 4 This is a schematic diagram of the overall structure of the drive component in the liquid hydrogen pump with leak self-detection of the present invention.

[0026] Figure 5 This is a schematic diagram of the overall structure of the pumping component in the liquid hydrogen pump with leak self-detection of the present invention.

[0027] Figure 6 This is a schematic diagram of the overall structure of the leak detection component in the liquid hydrogen pump with leak self-detection of the present invention.

[0028] Figure 7 This is a schematic diagram of the overall structure of the connecting components in the liquid hydrogen pump with leak self-detection of the present invention.

[0029] Explanation of key figure labels:

[0030] 1. Drive assembly; 11. Base; 12. Connecting seat; 13. Shaft; 14. Motor body; 2. Pumping assembly; 21. Pump body; 22. Connecting shaft; 23. Discharge pipe; 24. Volute; 25. Inlet pipe; 3. Leakage detection assembly; 31. Sleeve; 32. Hydrogen sensor; 33. Signal transmission module; 34. Sealing hose; 35. Gas collection bag; 4. Connecting assembly; 41. First arc plate; 42. Second arc plate; 43. Connecting hinge; 44. Pressure plate; 45. Fastener; 46. Screw; 5. Connecting pipe; 6. Seal. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. In addition, for the sake of convenience, the terms "upper," "lower," "left," and "right" are equivalent to the upper, lower, left, and right directions of the accompanying drawings themselves, and the terms "first," "second," etc., are used for descriptive purposes and have no other special meaning.

[0032] This application provides a liquid hydrogen pump with leak self-detection, solving the problems in the prior art. A leak detection component is sleeved on the outer wall of the liquid hydrogen pump's seal. The sleeve is tightly fitted around the seal, forming a relatively closed space for collecting potentially leaking hydrogen. A hydrogen sensor is installed on the upper surface of the sleeve, which can detect the concentration of hydrogen inside the sleeve in real time. A signal transmission module is connected to one side of the hydrogen sensor. This module is electrically connected to the hydrogen sensor and is responsible for receiving the detection signal from the hydrogen sensor. It also uses a built-in algorithm to determine whether the liquid hydrogen pump is leaking. This allows the leak detection component to tightly surround the seal and detect leaking hydrogen as soon as possible, achieving real-time monitoring.

[0033] Gas collection bladders are installed inside both ends of the casing. When liquid hydrogen leaks, the vaporized hydrogen first enters the gas collection bladder and is collected, preventing the hydrogen from directly overflowing into the air. Sealed hoses are connected to both ends of the gas collection bladder to further ensure that the hydrogen does not leak into the external environment. This not only effectively collects the leaked hydrogen but also avoids the safety hazards caused by hydrogen overflow, thus improving the safety of the liquid hydrogen pump operation.

[0034] Connecting components are installed at both ends of the leak detection assembly. The first and second arc-shaped plates are connected by a connecting hinge and can rotate around the hinge axis for easy installation and disassembly. During installation, the first and second arc-shaped plates are wrapped around both ends of the sleeve, and the pressure plate is fixed by screws and fasteners, thereby firmly connecting the leak detection assembly to the relevant parts of the liquid hydrogen pump. This ensures the reliability of the connection and facilitates maintenance and replacement of the leak detection assembly when needed. At the same time, the design of the connecting components can adapt to sleeves of different diameters. By adjusting the tightness of the screws and fasteners, the arc-shaped plates can be made to fit tightly against the sleeve surface, ensuring the sealing and stability of the connection and guaranteeing the long-term stable operation of the leak detection assembly.

[0035] The technical solution in this application is to solve the above problems, and the overall approach is as follows:

[0036] Example

[0037] This embodiment provides the specific structure of a liquid hydrogen pump with leak self-detection, such as... Figure 1-7 As shown, it includes a drive assembly 1 and a pumping assembly 2 disposed at the output end of the drive assembly 1. The drive assembly 1 and the pumping assembly 2 are connected in a transmission manner to drive the pumping assembly 2 to achieve liquid hydrogen transportation.

[0038] One end of the pumping assembly 2 is provided with a connecting pipe 5, and a sealing element 6 is provided at the intersection of the connecting pipe 5 and the pumping assembly 2;

[0039] The outer wall of the seal 6 is fitted with a leak detection component 3, and both ends of the leak detection component 3 are provided with connecting components 4;

[0040] The leak detection component 3 includes a sleeve 31 fitted onto the outer wall of the seal 6. Grooves are provided at both ends of the sleeve 31, and a gas collection bladder 35 is located inside the grooves. Several holes are provided inside the grooves of the sleeve 31, allowing hydrogen gas to escape through the grooves and enter the gas collection bladder 35. The volume of the gas collection bladder 35 is designed based on the actual amount of hydrogen gas that may leak, ensuring that it can collect leaked hydrogen gas within a certain time and prevent hydrogen gas from overflowing. The sleeve 31 is made of a low-temperature resistant, high-strength, and airtight metal material, such as low-temperature alloy steel, manufactured using precision tubing processing technology. The inner diameter of the sleeve 31 is designed according to the outer diameter of the liquid hydrogen pump seal 6, ensuring that the size of the sleeve 31 is larger than the size of the seal 6, allowing the sleeve 31 to fit over the outside of the seal 6. The cross-sectional diameter of the sleeve 31 is larger than the cross-sectional diameter of the seal 6. The sleeve 31 is made of a low-temperature resistant, high-strength, and airtight metal material.

[0041] A hydrogen sensor 32 is installed on the upper surface of the sleeve 31 to detect the concentration of hydrogen gas. The hydrogen sensor 32 is based on advanced electrochemical or optical detection principles and can detect extremely low concentrations of hydrogen gas in a very short time. The hydrogen sensor 32 is fixed to the upper surface of the sleeve 31 by a special mounting structure to ensure that its detection probe can fully contact the gas inside the sleeve 31. A signal transmission module 33 is provided on one side of the hydrogen sensor 32. The signal transmission module 33 adopts electronic components and circuit design with good low-temperature performance. It integrates signal amplification, processing and judgment circuits to amplify and process the output signal of the hydrogen sensor 32 and compare it with a preset leakage threshold, and issue a leakage alarm signal. The signal transmission module 33 can accurately receive the weak signal output by the hydrogen sensor 32, amplify and process it and compare it with the preset leakage threshold. If the detection signal exceeds the threshold, the signal transmission module immediately issues a leakage alarm signal. The signal transmission module 33 and the hydrogen sensor 32 are connected by a low-temperature cable to ensure the stability and reliability of signal transmission. The signal transmission module 33 is electrically connected to the hydrogen sensor 32 to receive the detection signal of the hydrogen sensor 32 and determine whether a leak has occurred.

[0042] Both ends of the sleeve 31 are equipped with gas collecting bladders 35 for collecting leaked hydrogen. The gas collecting bladders 35 are made of low-temperature resistant, highly elastic, and airtight rubber material. When the gas collecting bladders 35 are filled with gas, their volume will increase. Both ends of the gas collecting bladders 35 are equipped with sealing hoses 34. The sealing hoses 34 are made of low-temperature resistant and hydrogen corrosion resistant polymer material. Their inner diameter is adapted to the interface size of the gas collecting bladders 35. The two ends are connected to the gas collecting bladders 35 and related components using special sealing joints. The sealing hoses 34 are connected to the two ends of the sleeve 31. The length of the sealing hoses 34 is cut as needed to ensure that there is no twisting or excessive stretching when connecting the sleeve 31 and other components. The two ends of the sealing hoses 34 use special sealing joints to ensure the sealing of the connection.

[0043] Furthermore, the sealing element 6 is installed at the intersection of the connecting pipe 5 of the liquid hydrogen pump and the pumping component 2, ensuring that the sealing element 6 is firmly installed and has a good seal. Then, the sleeve 31 is fitted onto the outer wall of the sealing element 6, and the hydrogen sensor 32 is installed on the upper surface of the sleeve 31 according to the design position. The cryogenic cable with the signal transmission module 33 is connected, and the gas collecting bags 35 are installed inside both ends of the sleeve 31 respectively, ensuring that the gas collecting bags 35 are installed in the correct position and have a good seal. Finally, the airtightness of the entire leak detection component 3 is tested by filling the sleeve 31 with inert gas at a certain pressure and using professional leak detection equipment to detect whether there is a gas leak. If a leak is found, the cause is found and repaired in time to ensure that the airtightness of the leak detection component 3 meets the requirements.

[0044] The pumping assembly 2 includes a connecting shaft 22 connected to the shaft 13. The connecting shaft 22 is made of the same material as the shaft 13 and is manufactured through forging and precision machining. One end of the connecting shaft 22 is connected to the impeller shaft, and the other end is connected to the shaft 13 of the drive assembly 1. A keyed or splined connection is used to ensure reliable power transmission. One end of the connecting shaft 22 is equipped with a pump body 21, and the other end of the pump body 21 is equipped with a volute 24. The volute 24 and the impeller inside it are integrated into a single design. The shape of the volute 24 is optimized according to the flow trajectory of liquid hydrogen in the pump body 21 to improve the flow rate of liquid hydrogen. To reduce pressure, the inner wall of the volute 24 is precision machined to reduce the flow loss of liquid hydrogen within the volute. An outlet pipe 23 is located above the volute 24, and an inlet pipe 25 is located below the volute 24. The interiors of the outlet pipe 23 and inlet pipe 25 are polished to reduce resistance to liquid hydrogen flow. The outlet pipe 23 and inlet pipe 25 are connected to the pump body 22 by welding or flange connection to ensure a secure and well-sealed connection. An impeller is located inside the volute 24. The inlet pipe 25, outlet pipe 23, and connecting pipe 5 of the pump body 21 are connected by a sealing element 6, with the connection points of the sealing element 6 sealed by a rubber gasket.

[0045] Next, first, install the pump body 22 in a suitable position, and through adjustment and calibration, ensure that the levelness and verticality of the pump body 22 meet the requirements. Then, install the connecting shaft 21 on the impeller shaft of the pump body 22 to ensure a firm connection. Next, connect the outlet pipe 23 and the inlet pipe 25 to the inlet and outlet of the pump body 22 respectively. Finally, install the volute 24 on the pump body 22 and fix the connecting bolts to ensure that the pumping assembly 2 is installed.

[0046] The drive assembly 1 includes a base 11, the bottom of which is equipped with a shock-absorbing rubber pad or shock-absorbing spring to reduce the transmission of vibrations generated by the motor body 14 during operation to other components. The upper surface of the base 11 is precision machined to ensure that the connecting seat 12 can be installed stably. The motor body 14 is located on top of the base 11. The connecting seat 12 is located at the contact position between the motor body 14 and the base 11. The external shape of the connecting seat 12 is designed according to the connection requirements of the motor body 14 and the shaft 13 to ensure a tight connection with the motor body 14 and the shaft 13. The connecting seat 12 and the base 11 are connected by bolts to ensure a firm connection. The shaft 13 is located at the intersection of the motor body 14 and the pumping assembly 2. The surface of the shaft 13 is quenched and ground to improve its hardness and smoothness. The two ends of the shaft 13 are respectively machined with keyways or splines that are compatible with the output shaft of the motor body 14 and the connecting shaft 21 of the pumping assembly 2 to ensure the reliability of power transmission.

[0047] Furthermore, firstly, the base 11 is fixed on the mounting base of the liquid hydrogen pump, ensuring that the base 11 is level and firm. Then, the connecting seat 12 is installed on the base 11. Through adjustment and calibration, the position and angle of the connecting seat 12 are ensured to be accurate. Finally, the motor body 14 is installed on the connecting seat 12, and electrical connections and debugging are performed to ensure that the drive component 1 can operate normally.

[0048] The connecting component 4 includes a first arc plate 41 and a second arc plate 42. The first arc plate 41 and the second arc plate 42 are made of high-strength, low-temperature resistant metal materials, such as stainless steel, and are manufactured by stamping or forging processes. The curvature of the first arc plate 41 and the second arc plate 42 is designed according to the outer diameter of the sleeve 31 to ensure that they can tightly surround the sleeve 31 so as to ensure that they will not deform during the fastening process. The surfaces of the first arc plate 41 and the second arc plate 42 are treated with anti-corrosion, such as spraying a low-temperature resistant anti-corrosion coating to improve their service life in the liquid hydrogen environment. The surfaces of the first arc plate 41 and the second arc plate 42 are treated with anti-corrosion, and the curvature is adapted to the outer diameter of the sealing hose 34. The first arc plate 41 and the second arc plate 42 are in contact with the leakage detection component 3. A connecting hinge 43 is provided at one end of the first arc plate 41 and the second arc plate 42. The rotating part of the connecting hinge 43 is lubricated and coated with low-temperature grease to ensure that it can rotate flexibly in the low-temperature environment.

[0049] The second arc-shaped plate 42 has a pressure plate 44 at the end away from the connecting hinge 43. The first arc-shaped plate 41 has a screw 46 at the position of the pressure plate 44. A hole is opened at the intersection of the pressure plate 44 and the screw 46 to ensure that pressure can be applied evenly when the fastener 45 tightens the screw 46. The outer wall of the screw 46 is screwed with the fastener 45, which is a high-strength nut. The screw 46 is made of a high-strength bolt that matches the nut. The material is low-temperature resistant alloy steel. The length of the screw 46 is determined according to the actual installation requirements to ensure that sufficient tightening force can be provided during the tightening process. The surfaces of the screw 46 and the fastener 45 are treated with anti-rust treatment, such as zinc plating or nickel plating, to improve their corrosion resistance in the liquid hydrogen environment.

[0050] Furthermore, the first arc plate 41 and the second arc plate 42 are connected together by the connecting hinge 43 to ensure that the installation is firm and the rotation is flexible. The connecting component 4 is wrapped around both ends of the sleeve 31, and the positions of the first arc plate 41 and the second arc plate 42 are adjusted so that the first arc plate 41 and the second arc plate 42 are tightly attached to the surface of the sleeve 31.

[0051] Pass the screw 46 through the pressure plate 44 and screw on the fastener 45. Gradually tighten the fastener 45 with a wrench or power tool so that the pressure plate 44 presses firmly against the second arc plate 42, thereby firmly fixing the connecting component 4 onto the sleeve 31. After installation, check the installation of the connecting component 4 to ensure that the first arc plate 41 and the second arc plate 42 fit tightly against the sleeve 31, the connecting hinge 43 rotates normally, and there is no looseness of the pressure plate 44 and the fastener 45.

[0052] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A liquid hydrogen pump with self-detection of leaks, characterized in that, include: A drive assembly (1) and a pumping assembly (2) disposed at the output end of the drive assembly (1), wherein the drive assembly (1) and the pumping assembly (2) are connected in a transmission manner to drive the pumping assembly (2) to achieve liquid hydrogen transport; The pumping assembly (2) is provided with a connecting pipe (5) at one end, and a sealing element (6) is provided at the intersection of the connecting pipe (5) and the pumping assembly (2). The outer wall of the seal (6) is fitted with a leakage detection component (3), and both ends of the leakage detection component (3) are provided with connecting components (4). The leakage detection component (3) includes a sleeve (31) fitted onto the outer wall of the seal (6). A hydrogen sensor (32) is provided on the upper surface of the sleeve (31) for detecting the concentration of hydrogen. A signal transmission module (33) is provided on one side of the hydrogen sensor (32). The signal transmission module (33) is electrically connected to the hydrogen sensor (32) for receiving the detection signal from the hydrogen sensor (32) and determining whether a leak has occurred. Gas collection bags (35) are provided inside both ends of the sleeve (31) for collecting leaked hydrogen. A sealing hose (34) is provided at both ends of the gas collection bag (35).

2. The liquid hydrogen pump with leak self-detection according to claim 1, characterized in that: The pumping assembly (2) includes a connecting shaft (22) connected to the shaft (13). One end of the connecting shaft (22) is provided with a pump body (21), and the other end of the pump body (21) is provided with a volute (24). An outlet pipe (23) is provided above the volute (24), and an inlet pipe (25) is provided below the volute (24). An impeller is provided inside the volute (24).

3. The liquid hydrogen pump with leak self-detection according to claim 1, characterized in that: The drive assembly (1) includes a base (11), a motor body (14) is provided above the base (11), a connecting seat (12) is provided at the contact position between the motor body (14) and the base (11), and a shaft (13) is provided at the intersection of the motor body (14) and the pumping assembly (2).

4. The liquid hydrogen pump with leak self-detection according to claim 1, characterized in that: The connecting component (4) includes a first arc plate (41) and a second arc plate (42). The first arc plate (41) and the second arc plate (42) are in contact with the leakage detection component (3). A connecting hinge (43) is provided at one end of the first arc plate (41) and the second arc plate (42). The second arc plate (42) has a pressure plate (44) at one end away from the connecting hinge (43), and the first arc plate (41) has a screw (46) at the position of the pressure plate (44), and the outer wall of the screw (46) is screwed with a fastener (45).

5. The liquid hydrogen pump with leak self-detection according to claim 1, characterized in that: The cross-sectional diameter of the sleeve (31) is larger than that of the sealing element (6), and the sleeve (31) is made of a metal material that is resistant to low temperature, has high strength and good airtightness.

6. The liquid hydrogen pump with leak self-detection according to claim 1, characterized in that: The signal transmission module (33) adopts electronic components and circuit design with good low-temperature performance. It integrates signal amplification, processing and judgment circuits to amplify and process the output signal of the hydrogen sensor (32) and compare it with the preset leakage threshold, and issue a leakage alarm signal.

7. The liquid hydrogen pump with leak self-detection according to claim 1, characterized in that: The air collection bag (35) is made of a rubber material that is resistant to low temperature, highly elastic and has good airtightness. The volume of the air collection bag (35) will increase after it is filled with gas and expands.

8. The liquid hydrogen pump with leak self-detection according to claim 1, characterized in that: The sealing hose (34) is made of a low-temperature resistant and hydrogen corrosion resistant polymer material. Its inner diameter is adapted to the interface size of the gas collection bag (35). Both ends are connected to the gas collection bag (35) and related components using special sealing connectors.

9. The liquid hydrogen pump with leak self-detection according to claim 4, characterized in that: The first arc plate (41) and the second arc plate (42) are made of high-strength, low-temperature resistant metal materials, and the surface is treated with anti-corrosion. The arc is adapted to the outer diameter of the sealing hose (34).

10. The liquid hydrogen pump with leak self-detection according to claim 2, characterized in that: The volute (24) and its internal impeller are designed as an integrated unit. The inlet pipe (25), outlet pipe (23) and connecting pipe (5) of the pump body (21) are connected by a sealing element (6). The connection part of the sealing element (6) is sealed with a rubber sealing gasket.

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