A measuring device and a measuring method for a liquid hydrogen tank

Abstract

The application discloses a measuring device and a measuring method of a liquid hydrogen storage tank. The device is suitable for measuring parameters of the liquid hydrogen storage tank, and comprises a motor, a first magnet, a transmitter, a first signal transceiver and a processor arranged outside the liquid hydrogen storage tank, and a second magnet, a receiver, a second signal transceiver, a resonance sensor, a hole belt and an encoder arranged inside the liquid hydrogen storage tank. The application can measure the liquid level and density of liquid hydrogen in the ultra-low temperature (-253 DEG C) liquid hydrogen storage tank.

Description

Technical Field

[0001] This application belongs to the field of liquid hydrogen storage tank technology, specifically relating to a measuring device and measuring method for a liquid hydrogen storage tank. Background Technology

[0002] Liquid hydrogen storage tanks are generally divided into spherical tanks and vertical domed tanks, with a height typically exceeding 10 meters. Because liquid hydrogen is a cryogenic liquid, the liquid level, temperature, and density within the tank cannot be measured using traditional manual methods, especially for tanks with a volume of 500m³. 3 When measuring the level of large cryogenic (-253℃) liquid hydrogen storage tanks with a height approaching or exceeding 20 meters or a diameter exceeding 20 meters, conventional level measurement instruments present several challenges. If a radar level gauge is used, the dielectric constant of liquid hydrogen is typically 1.224, which is less than the minimum dielectric constant requirement of 1.6 for radar level gauges. While a capacitance level gauge can measure the liquid hydrogen level, its production, transportation, and installation are difficult due to the large size of the tank. If a conventional servo level gauge is used, it relies on the buoyancy of a float to measure the level, which is insufficient given the density of liquid hydrogen (only 70.8 kg / m³). 3 However, commercially available servo level gauges require the density of the measured liquid to be no less than 400 kg / m³. 3 .

[0003] Therefore, there is currently a lack of a method capable of handling volumes of 500m³. 3 This device measures the liquid level, temperature, density, etc., of large cryogenic (-253℃) liquid hydrogen storage tanks with a height close to or greater than 20 meters or a diameter greater than 20 meters. Summary of the Invention

[0004] This application aims to at least partially address the current lack of a method capable of handling volumes of 500m³. 3 This application addresses the technical problem of measuring the liquid level and density of large-scale liquid hydrogen storage tanks (-253°C) with a height approaching or exceeding 20 meters or a diameter exceeding 20 meters. To address this, the present application provides a measuring device and method for liquid hydrogen storage tanks.

[0005] The technical solution of this application is as follows:

[0006] On one hand, this application provides a measuring device for a liquid hydrogen storage tank, suitable for measuring the parameters of the liquid hydrogen storage tank, the device comprising:

[0007] The motor, first magnet, transmitter, first signal transceiver, and processor are installed outside the liquid hydrogen storage tank;

[0008] In addition, a second magnet, a receiver, a second signal transceiver, a resonant sensor, a perforated strip, and an encoder are disposed inside the liquid hydrogen storage tank;

[0009] The first magnet is connected to the output shaft of the motor, the second magnet is connected to the first magnet, the resonant sensor is connected to the second magnet through the perforated strip, the perforated strip can rotate and be wound around the second magnet, the encoder is disposed between the second magnet and the resonant sensor, and the encoder shaft is disposed corresponding to the perforated strip;

[0010] The transmitter is connected to the receiver, and the first transceiver is connected to the second transceiver;

[0011] The motor, the transmitter, and the first transceiver are all electrically connected to the processor, the receiver is electrically connected to the second transceiver, and the second transceiver is electrically connected to the resonant sensor and the encoder.

[0012] Furthermore, the device also includes:

[0013] The first wheel hub, the first magnet is disposed on the first wheel hub;

[0014] The second hub has the second magnet mounted on it, and the resonant sensor is connected to the second hub via the perforated strip, which can rotate and wrap around the second hub.

[0015] Furthermore, the second hub is provided with an annular groove, and the perforated strip can be wound around the annular groove.

[0016] Furthermore, the device also includes a transmission mechanism, through which the motor is connected to the first wheel hub.

[0017] Furthermore, the transmission mechanism is a worm gear transmission mechanism.

[0018] Furthermore, the device also includes a fixed shaft, one end of which is connected to the inner wall of the liquid hydrogen storage tank, and the other end of which is connected to the second wheel hub via a bearing.

[0019] Furthermore, the device also includes a temperature sensor electrically connected to the second transceiver, and the temperature sensor is connected to the second hub via the perforated belt.

[0020] Furthermore, the temperature sensor is model PT1000.

[0021] Furthermore, the device also includes a float, on which the resonant sensor and the temperature sensor are disposed, and the float is connected to the second hub via the perforated belt.

[0022] Furthermore, the wires connecting the resonant sensor and the temperature sensor to the second signal transceiver are disposed within the aperture strip.

[0023] Furthermore, the material of the perforated strip is polyetheretherketone or polyimide.

[0024] Furthermore, the material of the conductor is austenitic stainless steel.

[0025] On the other hand, this application provides a measurement method applicable to the measurement device of the aforementioned liquid hydrogen storage tank, the method comprising:

[0026] The processor records the initial height of the resonant sensor;

[0027] The processor controls the transmitter to supply power, so that the receiver, the second signal transceiver, the encoder and the resonant sensor are powered on and in working condition.

[0028] The processor controls the motor to start, so that the first magnet, the second magnet and the perforated strip are in operation, and the resonant sensor moves up and down as the perforated strip is rolled up or unrolled.

[0029] The processor analyzes and processes the resonant frequency signals transmitted sequentially by the resonant sensor through the second signal transceiver and the first signal transceiver.

[0030] After the processor detects a change in the resonant frequency signal, it controls the motor to stop running.

[0031] The processor analyzes and processes the data transmitted sequentially by the encoder through the second and first transceivers, and calculates the liquid level in the liquid hydrogen storage tank by combining the initial height of the resonant sensor.

[0032] The embodiments of this application have at least the following beneficial effects:

[0033] The measuring device for a liquid hydrogen storage tank proposed in this application is installed on the liquid hydrogen storage tank. The initial height of the resonant sensor is determined and recorded. The transmitter is controlled by a processor to power the receiver, which in turn powers a second transceiver. Finally, the second transceiver powers the resonant sensor, enabling it to operate and feeding back the detected resonant frequency signal to the second transceiver. The second transceiver then wirelessly transmits the data to a first transceiver, which finally transmits the data to the processor for analysis and processing.

[0034] Simultaneously, the processor controls the motor to drive the first magnet to rotate, which in turn drives the second magnet to rotate via magnetic force. The rotation of the second magnet causes the perforated tape to be wound up or unwound. When the resonant sensor is below the liquid surface, the processor controls the motor to rotate and wound up the perforated tape. When the resonant sensor is above the liquid surface, the processor controls the motor to rotate in the opposite direction and unwound the perforated tape. During the winding or unwinding of the perforated tape, the encoder's rotating shaft follows the movement of the perforated tape and rotates accordingly. The rotation data is fed back to the processor for analysis and processing via the second and first signal transceivers. When the resonant sensor moves to the liquid surface, it detects the change in resonant frequency. After receiving the signal indicating the change in resonant frequency, the processor controls the motor to stop rotating. After analyzing and processing the signal fed back by the encoder, the processor calculates the displacement of the resonant sensor and combines it with the initial height of the resonant sensor to calculate the liquid level in the liquid hydrogen storage tank. In other words, the liquid level of the liquid hydrogen in the liquid hydrogen storage tank is measured by this device.

[0035] Furthermore, when the resonant sensor is in operation, the exciter of the resonant sensor vibrates. Feedback from the resonant body of the resonant sensor forms a closed loop, creating a resonant body. The resonant frequency of the resonant body is proportional to the density of the surrounding medium and changes with the density of the surrounding medium. For example, the resonant frequency of the resonant body in air is F0, and the resonant frequency of the resonant body in liquid hydrogen is F1. When the resonant frequency changes from F0 to (F0+F1) / 2, it means that half of the resonant body has entered the liquid hydrogen. This serves as the basis for judging whether the resonant sensor has moved to the liquid surface. In other words, the density of the medium can be determined by the resonant sensor based on the resonant frequency, that is, the density of liquid hydrogen in the liquid hydrogen storage tank can be measured by this device.

[0036] In summary, the measuring device for a liquid hydrogen storage tank proposed in this application can measure the liquid level and density of liquid hydrogen in a cryogenic (-253℃) liquid hydrogen storage tank. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of a measuring device for a liquid hydrogen storage tank according to an embodiment of this application;

[0039] Figure 2 This is a partial structural diagram of a measuring device located inside a liquid hydrogen storage tank, according to an embodiment of this application.

[0040] Figure 3 This is a flowchart illustrating a measurement method implemented in this application.

[0041] Figure label:

[0042] 10-Liquid hydrogen storage tank; 20-Motor; 30-First magnet; 40-Transmitter; 50-First transceiver; 60-Processor; 70-Second magnet; 80-Receiver; 90-Second transceiver; 100-Resonant sensor; 110-Pattern strip; 111-Encoding hole; 120-Encoder; 130-First hub; 140-Second hub; 141-Annular groove; 150-Transmission mechanism; 160-Fixed shaft; 170-Temperature sensor; 180-Float. Detailed Implementation

[0043] The technical solutions of the embodiments of this application 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 this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0045] This application is described below with reference to the accompanying drawings and specific embodiments:

[0046] Please refer to Figures 1-2 This application provides a measuring device for a liquid hydrogen storage tank, combined with... Figure 1The device includes a motor 20, a first magnet 30, a transmitter 40, a first transceiver 50, a processor 60, a second magnet 70, a receiver 80, a second transceiver 90, a resonant sensor 100, a perforated strip 110, and an encoder 120.

[0047] In this embodiment, the motor 20, the first magnet 30, the transmitter 40, the first transceiver 50, and the processor 60 are disposed outside the liquid hydrogen storage tank 10, while the second magnet 70, the receiver 80, the second transceiver 90, the resonant sensor 100, the aperture strip 110, and the encoder 120 are disposed inside the liquid hydrogen storage tank 10.

[0048] The first magnet 30 is connected to the output shaft of the motor 20, the second magnet 70 is connected to the first magnet 30, the resonant sensor 100 is connected to the second magnet 70 through a perforated strip 110, the perforated strip 110 can rotate and be wound around the second magnet 70, the encoder 120 is set between the second magnet 70 and the resonant sensor 100, and the rotating shaft of the encoder 120 is set to correspond to the perforated strip 110;

[0049] Transmitter 40 is connected to receiver 80, and first transceiver 50 is connected to second transceiver 90;

[0050] The motor 20, transmitter 40 and first transceiver 50 are all electrically connected to the processor 60, the receiver 80 is electrically connected to the second transceiver 90, and the resonant sensor 100 and encoder 120 are all electrically connected to the second transceiver 90.

[0051] Specifically, in combination Figure 1 The device is installed on the liquid hydrogen storage tank 10. The initial height of the resonant sensor 100 is determined and recorded. The processor 60 controls the transmitter 40 to supply power to the receiver 80, which in turn supplies power to the second transceiver 90. Finally, the second transceiver 90 supplies power to the resonant sensor 100, putting it into operation. The sensor then feeds back the received resonant frequency signal to the second transceiver 90, which wirelessly transmits the data to the first transceiver 50. Finally, the first transceiver 50 transmits the data to the processor 60 for analysis and processing.

[0052] Simultaneously, the processor 60 controls the motor 20 to drive the first magnet 30 to rotate, and the first magnet 30 then drives the second magnet 70 to rotate through magnetic force. The rotation of the second magnet 70 winds up or unwinds the perforated strip 110. When the resonant sensor 100 is below the liquid surface, the processor 60 controls the motor 20 to rotate and wind up the perforated strip 110. When the resonant sensor 100 is above the liquid surface, the processor 60 controls the motor 20 to rotate in the opposite direction and unwind the perforated strip 110. During the winding up or unwinding of the perforated strip 110, the rotating shaft of the encoder 120 rotates along with the movement of the perforated strip 110 and transmits the rotation data. The signals are fed back to the processor 60 sequentially through the second transceiver 90 and the first transceiver 50 for analysis and processing. When the resonant sensor 100 moves to the liquid surface, the resonant frequency changes. After the processor 60 detects the change in the resonant frequency signal, it controls the motor 20 to stop rotating. After analyzing and processing the signal fed back by the encoder 120, the processor 60 calculates the displacement of the resonant sensor 100 and then calculates the liquid level in the liquid hydrogen storage tank 10 by combining the initial height of the resonant sensor 100. In other words, the liquid level of the liquid hydrogen in the liquid hydrogen storage tank 10 is measured by this device.

[0053] Furthermore, when the resonant sensor 100 is in operation, the exciter of the resonant sensor 100 vibrates. Feedback from the resonator of the resonant sensor 100 forms a closed loop, and the resonant frequency of the resonator is proportional to the density of the surrounding medium and changes with the density of the surrounding medium. For example, the resonant frequency of the resonator in air is F0, and the resonant frequency of the resonator in liquid hydrogen is F1. When the resonant frequency changes from F0 to (F0+F1) / 2, that is, half of the resonator enters the liquid hydrogen, this is used as the basis for judging that the resonant sensor 100 has moved to the liquid surface. In other words, the density of the medium can be judged by the resonant frequency through the resonant sensor 100, that is, the density of liquid hydrogen in the liquid hydrogen storage tank 10 can be measured by this device.

[0054] In this embodiment of the application, coding holes 111 are equally spaced along the length direction of the perforated strip 110. When the perforated strip 110 is running, the encoder 120 counts and encodes the coding holes 111 to accurately measure the length change of the perforated strip 110 during operation.

[0055] In this embodiment, the transmitter 40 is a wireless power transmitter, and the receiver 80 is the wireless power receiver. The transmitter 40 and the receiver 80 transmit power wirelessly.

[0056] In this embodiment of the application, both the first transceiver 50 and the second transceiver 90 are wireless transceivers, and the first transceiver 50 and the second transceiver 90 transmit signals wirelessly.

[0057] In this embodiment, the structure of the resonant sensor 100 can be a resonant cylinder, a resonant tuning fork, a direct piezoelectric ceramic resonator, etc., and this embodiment does not limit it.

[0058] Furthermore, combined Figure 1 The device also includes a first hub 130 and a second hub 140. A first magnet 30 is disposed on the first hub 130, and a second magnet 70 is disposed on the second hub 140. A resonant sensor 100 is connected to the second hub 140 via a perforated band 110, which can rotate and wrap around the second hub 140. This allows the first magnet 30 and the second magnet 70 to be mounted and fixed via the first hub 130 and the second hub 140, respectively, and facilitates connection with other structures of the device via the first hub 130 and the second hub 140.

[0059] In this embodiment, coils can be respectively disposed on the opposing surfaces of the first hub 130 and the second hub 140. The coil on the first hub 130 is connected to the transmitter 40 and the first transceiver 50, and the coil on the second hub 140 is connected to the receiver 80 and the second transceiver 90, so as to realize wireless transmission of power and signals through the coils on the first hub 130 and the second hub 140. In addition, the receiver 80 and the second transceiver 90 can be disposed on the second hub 140.

[0060] Combination Figure 1 The second hub 140 is provided with an annular groove 141, and the perforated strip 110 can be wound in the annular groove 141 to ensure the winding effect of the perforated strip 110 on the second hub 140 and to prevent the perforated strip 110 from falling off.

[0061] In this embodiment, the device further includes a transmission mechanism 150. The motor 20 is connected to the first hub 130 via the transmission mechanism 150. Since the rotational speed of the motor 20 is often relatively high, the hole belt 110 and the resonant sensor 100 in the device move too fast, affecting the measurement accuracy of the device. Therefore, it is necessary to reduce the rotational speed through the transmission mechanism 150 to ensure measurement accuracy.

[0062] In this embodiment, the transmission mechanism 150 can be a worm gear transmission mechanism 150, a gear transmission mechanism 150, etc., and this embodiment does not limit it.

[0063] The preferred transmission mechanism is a worm gear transmission mechanism 150, which includes a worm, a transmission shaft, and a worm. The worm is connected to the output shaft of the motor 20, the transmission shaft is connected to the first hub 130, and the worm wheel is mounted on the transmission shaft and meshes with the worm for transmission.

[0064] Combination Figure 2 The device also includes a fixed shaft 160, one end of which is connected to the inner wall of the liquid hydrogen storage tank 10, and the other end of which is connected to the second hub 140 via a bearing to fix the second hub 140 and ensure the rotation of the second hub 140.

[0065] Combination Figure 1 The device also includes a temperature sensor 170, which is electrically connected to a second transceiver 90. The temperature sensor 170 is connected to a second hub 140 via a perforated belt 110. The second transceiver 90 supplies power to the temperature sensor 170. The temperature sensor 170 feeds back the measured temperature data to the second transceiver 90. The second transceiver 90 transmits the data to the processor 60 for analysis and processing via a first transceiver 50, thereby enabling the device to measure the temperature inside the liquid hydrogen storage tank 10.

[0066] In this embodiment, the temperature sensor 170 can be a temperature sensor element such as PT1000 that can measure ultra-low temperatures, and this embodiment does not limit it.

[0067] Combination Figure 1 The device also includes a float 180, a resonant sensor 100 and a temperature sensor 170 mounted on the float 180. The float 180 is connected to the second hub 140 via a perforated belt 110, so that the resonant sensor 100 and the temperature sensor 170 are mounted together by the float 180, ensuring that the temperature measured by the temperature sensor 170 is the temperature at the location of the resonant sensor 100, thereby clarifying whether the temperature sensor 170 is measuring the air or liquid hydrogen in the liquid hydrogen storage tank 10.

[0068] In this embodiment, the wires connecting the resonant sensor 100 and the temperature sensor 170 to the second signal transceiver 90 are disposed within the perforated strip 110 to protect the wires from ultra-low temperatures and from damage during the movement of the perforated strip 110 and the resonant sensor 100.

[0069] In this embodiment, the material of the perforated strip 110 is an engineering plastic that is resistant to ultra-low temperatures, such as polyetheretherketone or polyimide, which ensures the bending performance and low-temperature resistance of the perforated strip 110. Generally, the engineering plastic and the conductor are made into a special flat cable by using a cable hot extrusion process, and then holes are punched in the middle of the flat cable at a certain distance.

[0070] In this embodiment, the wires used to connect the resonant sensor 100 and the temperature sensor 170 to the second transceiver 90 are made of austenitic stainless steel to ensure that the wires can maintain normal connection between the resonant sensor 100 and the temperature sensor 170 and the second transceiver 90 under ultra-low temperature conditions.

[0071] The performance parameters achievable by the measuring device for a liquid hydrogen storage tank proposed in this application are shown in the table below:

[0072]

[0073] Please refer to Figure 3 This application also proposes a measurement method applicable to the aforementioned measuring device for liquid hydrogen storage tanks, combined with... Figure 3 The method includes the following steps:

[0074] S1: Processor 60 records the initial height of resonant sensor 100;

[0075] S2: The processor 60 controls the transmitter 40 to supply power, so that the receiver 80, the second signal transceiver 90, the encoder 120 and the resonant sensor 100 are powered on and put into operation.

[0076] S3: The processor 60 controls the motor 20 to start, so that the first magnet 30, the second magnet 70 and the perforated strip 110 are in motion, and the resonant sensor 100 moves up and down as the perforated strip 110 is rolled up or unrolled.

[0077] S4: The processor 60 analyzes and processes the resonant frequency signals transmitted sequentially by the resonant sensor 100 through the second signal transceiver 90 and the first signal transceiver 50.

[0078] S5: After the processor 60 detects a change in the resonant frequency signal, it controls the motor 20 to stop running;

[0079] S6: The processor 60 analyzes and processes the data transmitted sequentially by the encoder 120 through the second signal transceiver 90 and the first signal transceiver 50, and calculates the liquid level height in the liquid hydrogen storage tank 10 by combining the initial height of the resonant sensor 100.

[0080] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0081] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0082] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0083] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0086] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0087] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A measuring device for a liquid hydrogen storage tank, suitable for measuring parameters of a liquid hydrogen storage tank, characterized in that, The device includes: The motor (20), the first magnet (30), the transmitter (40), the first signal transceiver (50) and the processor (60) are located outside the liquid hydrogen storage tank (10). In addition, a second magnet (70), a receiver (80), a second signal transceiver (90), a resonant sensor (100), a perforated strip (110), and an encoder (120) are disposed inside the liquid hydrogen storage tank (10). The first magnet (30) is connected to the output shaft of the motor (20), the second magnet (70) is connected to the first magnet (30), the resonant sensor (100) is connected to the second magnet (70) through the perforated strip (110), the perforated strip (110) can rotate and be wound around the second magnet (70), the encoder (120) is disposed between the second magnet (70) and the resonant sensor (100), and the rotating shaft of the encoder (120) is correspondingly disposed with the perforated strip (110); The transmitter (40) is connected to the receiver (80), and the first transceiver (50) is connected to the second transceiver (90); The motor (20), the transmitter (40) and the first transceiver (50) are all electrically connected to the processor (60), the receiver (80) is electrically connected to the second transceiver (90), and the second transceiver (90) is electrically connected to the resonant sensor (100) and the encoder (120). The first hub (130) is provided with the first magnet (30) disposed on the first hub (130); The second hub (140) is provided with the second magnet (70) and the resonant sensor (100) is connected to the second hub (140) through the perforated strip (110). The perforated strip (110) can rotate with the second hub (140) and be wound around the second hub (140). Coils are respectively provided on the opposite surfaces of the first hub (130) and the second hub (140). The coil on the first hub (130) is connected to the transmitter (40) and the first signal transceiver (50), and the coil on the second hub (140) is connected to the receiver (80) and the second signal transceiver (90).

2. The measuring device for a liquid hydrogen storage tank according to claim 1, characterized in that, The second hub (140) is provided with an annular groove (141), and the perforated strip (110) can be wound around the annular groove (141).

3. The measuring device for a liquid hydrogen storage tank according to claim 1, characterized in that, The device also includes a transmission mechanism (150), through which the motor (20) is connected to the first wheel hub (130).

4. The measuring device for a liquid hydrogen storage tank according to claim 3, characterized in that, The transmission mechanism (150) is a worm gear transmission mechanism.

5. The measuring device for a liquid hydrogen storage tank according to claim 1, characterized in that, The device also includes a fixed shaft (160), one end of which is connected to the inner wall of the liquid hydrogen storage tank (10), and the other end of which is connected to the second hub (140) via a bearing.

6. The measuring device for a liquid hydrogen storage tank according to any one of claims 2-5, characterized in that, The device also includes a temperature sensor (170) electrically connected to the second transceiver (90) and connected to the second hub (140) via the perforated belt (110).

7. The measuring device for a liquid hydrogen storage tank according to claim 6, characterized in that, The temperature sensor (170) is model PT1000.

8. The measuring device for a liquid hydrogen storage tank according to claim 6, characterized in that, The device also includes a float (180), on which the resonant sensor (100) and the temperature sensor (170) are disposed, and the float (180) is connected to the second hub (140) through the perforated belt (110).

9. The measuring device for a liquid hydrogen storage tank according to claim 6, characterized in that, The wires connecting the resonant sensor (100) and the temperature sensor (170) to the second signal transceiver (90) are disposed within the aperture strip (110).

10. The measuring device for a liquid hydrogen storage tank according to claim 9, characterized in that, The material of the perforated strip (110) is polyetheretherketone or polyimide, and the material of the wire is austenitic stainless steel.

11. A measurement method, characterized in that, The method is applicable to the measuring device for the liquid hydrogen storage tank according to any one of claims 1-10, and the method includes: The processor (60) records the initial height of the resonant sensor (100); The processor (60) controls the transmitter (40) to supply power, so that the receiver (80), the second signal transceiver (90), the encoder (120) and the resonant sensor (100) are powered on and put into operation. The processor (60) controls the motor (20) to start, so that the first magnet (30), the second magnet (70) and the perforated strip (110) are in motion, and the resonant sensor (100) moves up and down as the perforated strip (110) is rolled up or unrolled. The processor (60) analyzes and processes the resonant frequency signals transmitted sequentially by the resonant sensor (100) through the second transceiver (90) and the first transceiver (50); After the processor (60) detects a change in the resonant frequency signal, it controls the motor (20) to stop running; The processor (60) analyzes and processes the data transmitted sequentially by the encoder (120) through the second transceiver (90) and the first transceiver (50), and calculates the liquid level in the liquid hydrogen storage tank (10) in conjunction with the initial height of the resonant sensor (100).

Images