Liquid level meter and liquid level measuring device of storage tank

Abstract

The utility model relates to the technical field of liquid level meters, and discloses a liquid level meter and a liquid level measuring device of a storage tank, at least two liquid level sensors are arranged in each liquid level meter, and besides the inherent liquid level sensor of the liquid level meter, at least one newly arranged liquid level sensor is additionally arranged in an oil gas cavity of each liquid level meter. A newly-arranged liquid level sensor and an inherent liquid level sensor of the liquid level meter can collect at least two independent liquid level signals; besides, the liquid level meter is further applied to the storage tank, so that a liquid level measuring device of the storage tank can output a plurality of independent liquid level results, the requirement that only two liquid stabilizing pipes are arranged when equipment is installed is met, the requirement that a plurality of independent liquid level results are output at the same time, and interlocking signals are provided for a safety interlocking system is met, and the safety interlocking system is improved. And the safety monitoring requirement is met to the greatest extent.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level gauges, in particular to a liquid level gauge and a liquid level measuring device for a storage tank. Background Art

[0002] In the safety management regulations for hazardous chemical tank areas, in order to ensure that the operation of the tank area is safe and reliable, the hazardous chemical tank area needs to have three-out-of-two liquid level gauges for valve interlocking control. When two of the liquid level gauges have high or low liquid level alarms, the control system will automatically output a control signal to achieve emergency shutdown or switching of the production equipment.

[0003] The liquid level gauge of a storage tank is generally installed on the mounting flange of the tank top. The installation position of the liquid level gauge must have a stabilizing pipe from the top of the tank to the bottom of the tank. The stabilizing pipe not only stabilizes the liquid level, but also protects the components of the liquid level gauge placed in the tank from the impact or damage of external forces. For floating roof tanks, since the stabilizing pipe must pass through the floating plate, when there are more than two stabilizing pipes, it is easy for the floating plate to be stuck by the guide pipe and cause the floating plate to be damaged. Therefore, it is best to set only two stabilizing pipes. Therefore, floating roof tanks can only ensure stable measurement of two liquid level gauges.

[0004] In the above scheme, since traditional liquid level gauges basically use one measurement principle to measure the liquid level, one liquid level gauge can only output one liquid level signal. This results in that floating roof tanks cannot meet the needs of the safety interlocking system to provide interlocking signals, and the failure rate is high. Utility Model Content

[0005] In view of this, the utility model provides a liquid level meter and a liquid level measuring device for a storage tank to solve the problem that one liquid level meter can only output one liquid level signal.

[0006] In a first aspect, the utility model provides a liquid level meter, which is arranged on a storage tank; the liquid level meter comprises an oil and gas cavity and an electrical cavity;

[0007] At least two liquid level sensors are arranged in the oil-gas cavity, and the measurement principles of the liquid level sensors are different. The liquid level sensors are suitable for measuring the liquid level in the storage tank respectively to independently collect liquid level signals;

[0008] The electrical chamber includes an output circuit, which is suitable for receiving the liquid level signals respectively collected by each of the liquid level sensors and outputting each liquid level result.

[0009] In the above solution, at least two liquid level sensors are arranged in one liquid level meter, so that at least two liquid level results can be outputted simultaneously through one liquid level meter.

[0010] In an optional embodiment, the oil-gas chamber includes two liquid level sensors with different measurement principles; the two liquid level sensors with different measurement principles are respectively a newly-installed liquid level sensor and an inherent liquid level sensor of the liquid level meter.

[0011] The above scheme adds a new liquid level sensor in the oil and gas cavity of the liquid level meter, so that the new liquid level sensor and the inherent liquid level sensor of the liquid level meter can measure the liquid level in the storage tank at the same time, and collect two independent liquid level signals.

[0012] In an optional implementation, the liquid level meter is a servo-type liquid level meter; and the newly-installed liquid level sensor is a radar-type liquid level sensor or an ultrasonic-type liquid level sensor.

[0013] The above scheme distinguishes the measurement principle of the newly-installed liquid level sensor from the measurement principle of the inherent liquid level sensor of the liquid level meter, so that the liquid level meter can output two liquid level signals.

[0014] In an optional embodiment, a control mechanism is arranged in the electrical cavity, and the electrical interface of the newly-installed liquid level sensor is connected to a corresponding interface of the control mechanism;

[0015] The control mechanism is suitable for controlling each of the liquid level sensors to measure the liquid level in the storage tank.

[0016] The above scheme is based on the control mechanism to achieve accurate measurement and effective control of the liquid level, which not only improves the accuracy and stability of the liquid level measurement, but also provides strong support for industrial automation and intelligence.

[0017] In an optional embodiment, a common mounting flange is arranged in the oil-gas cavity; the newly-installed liquid level sensor is fixed to the common mounting flange in the oil-gas cavity by flange bolts;

[0018] The output circuit of the liquid level meter is also suitable for outputting a current signal of 4mA to 20mA and a switch alarm signal.

[0019] The above scheme uses a common mounting flange for the newly installed liquid level sensor and the inherent liquid level sensor of the liquid level meter. The use of a common mounting flange can save space and simplify the installation process. By designing a universal flange interface, these different types of liquid level sensors can share the same mounting point. This not only reduces the workload during the installation process, but also reduces the installation cost and maintenance cost.

[0020] In a second aspect, the utility model provides a liquid level measuring device for a storage tank, wherein the liquid level measuring device comprises the liquid level meter as described above.

[0021] The above scheme applies the liquid level meter to the storage tank, so that the liquid level measurement device of the storage tank can output multiple liquid level results at the same time. This not only meets the need of only two liquid stabilizing tubes when the equipment is installed, but also meets the need of outputting multiple liquid level results at the same time and providing interlocking signals for the safety interlocking system, so as to maximize the safety monitoring needs.

[0022] In an optional embodiment, the liquid level measuring device includes a first liquid level gauge and a second liquid level gauge;

[0023] The first liquid level gauge is arranged with a first inherent liquid level sensor and a first newly installed liquid level sensor; the second liquid level gauge is arranged with a second inherent liquid level sensor and a second newly installed liquid level sensor; the measurement principles of the first inherent liquid level sensor, the first newly installed liquid level sensor, the second inherent liquid level sensor and the second newly installed liquid level sensor are all different.

[0024] The liquid level measuring device of the above scheme includes two liquid level gauges. Therefore, there is no need to install a third liquid stabilizing tube when installing the equipment, ensuring that each liquid level gauge achieves liquid stabilization or protection in accordance with the installation standards; and four liquid level results can be output simultaneously to meet safety monitoring needs to the greatest extent.

[0025] In an optional embodiment, the liquid level measuring device further comprises a common wiring terminal cavity;

[0026] The first electrical cable of the first liquid level meter is connected to the first electrical terminal in the common wiring terminal cavity; the second electrical cable of the second liquid level meter is connected to the second electrical terminal in the common wiring terminal cavity.

[0027] The above solution can simplify wiring, reduce costs and improve installation efficiency by sharing the wiring terminal cavity.

[0028] In an optional embodiment, the liquid level measuring device further includes a common power supply; the first power supply terminal of the first liquid level meter is connected to the common power supply through the first power supply connection terminal of the common wiring terminal cavity; the second power supply terminal of the second liquid level meter is connected to the common power supply through the second power supply connection terminal of the common wiring terminal cavity;

[0029] Alternatively, the liquid level measuring device also includes a first power supply and a second power supply; the first power supply end of the first liquid level meter is connected to the first power supply through the first power supply connection terminal of the common terminal cavity; the second liquid level meter is connected to the second power supply through the second power supply connection terminal of the common terminal cavity.

[0030] The above scheme provides flexible options in power supply settings. Shared power supply provides a more economical and practical option. In order to ensure the stability and safety of the system, separate power supply can also reduce the risk of fault propagation.

[0031] In an optional embodiment, the liquid level measuring device further includes a common communication bus; the first communication end of the first liquid level meter is connected to the common communication bus via the first communication connection terminal of the common wiring terminal cavity; the second communication end of the second liquid level meter is connected to the common communication bus via the second communication connection terminal of the common wiring terminal cavity;

[0032] Alternatively, the liquid level measuring device further comprises a signal cable, and the output circuit of the first liquid level meter is connected to the control mechanism of the second liquid level meter, so that the output circuit of the second liquid level meter simultaneously outputs the liquid level result measured by the first liquid level meter and the liquid level result measured by the second liquid level meter.

[0033] The technical solution provided by the utility model may have the following beneficial effects:

[0034] The utility model arranges at least two liquid level sensors in a liquid level meter. In addition to the inherent liquid level sensor of the liquid level meter, at least one newly-installed liquid level sensor is added in the oil and gas cavity of each liquid level meter, so that the newly-installed liquid level sensor and the inherent liquid level sensor of the liquid level meter respectively measure the liquid level in the storage tank, and collect at least two independent liquid level signals. In addition, the utility model applies the liquid level meter to the storage tank, so that the liquid level measuring device of the storage tank can output multiple independent liquid level results, which not only meets the need of only two liquid stabilizing tubes when the equipment is installed, but also meets the need of outputting multiple independent liquid level results at the same time, and provides interlocking signals for the safety interlocking system, so that liquid level results such as four-out-of-two or four-out-of-three can be output, thereby meeting the safety monitoring needs to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of a liquid level meter according to an embodiment of the utility model;

[0037] Figure 2 It is a structural schematic diagram of a liquid level meter when the liquid level meter is a servo type liquid level meter according to an embodiment of the utility model;

[0038] Figure 3 It is a structural schematic diagram of a liquid level measuring device for a storage tank according to an embodiment of the utility model;

[0039] Among them, 1-liquid level meter; 11-electrical cavity; 111-output circuit; 112-control mechanism; 12-oil and gas cavity; 121-new liquid level sensor; 122-inherent liquid level sensor; 123-common mounting flange; 124-wheel hub; 125-measuring ruler; 2-storage tank; 3-liquid level measuring device; 31-common terminal cavity; 32-common power supply; 33-common communication bus. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0041] Since a liquid level gauge in the related art can only output one liquid level signal, in order to meet the safety management regulations of outputting at least three liquid level signals, three liquid level gauges are usually installed on the storage tank, and a corresponding stabilizing tube is set under each liquid level gauge. However, a floating roof tank can only be equipped with two stabilizing tubes, which results in one liquid level gauge failing to achieve liquid stabilization or protection in accordance with the installation standards, and various faults may occur, and the purpose of at least stably outputting three liquid level signals cannot be achieved. The embodiment of the utility model provides a liquid level gauge and a liquid level measuring device for a storage tank, in which at least two liquid level sensors are arranged in a liquid level gauge, so that at least two independent liquid level results can be output by one liquid level gauge, and the purpose of stably outputting four liquid level signals can be achieved by two liquid level gauges.

[0042] According to an embodiment of the utility model, a liquid level meter embodiment is provided. Figure 1 Schematic diagram of the structure of a liquid level meter according to an embodiment of the utility model, such as Figure 1 As shown, the liquid level meter 1 is arranged on the storage tank 2; the liquid level meter 1 includes an oil and gas chamber 12 and an electrical chamber 11;

[0043] At least two liquid level sensors (i.e. Figure 1 The newly-installed liquid level sensor 121 and the inherent liquid level sensor 122 are configured with different measuring principles, and each of the liquid level sensors is suitable for measuring the liquid level in the storage tank 2 to independently collect liquid level signals;

[0044] The electrical chamber 11 includes an output circuit 111, which is suitable for receiving the liquid level signals collected by each liquid level sensor and outputting each liquid level result.

[0045] In an optional embodiment, the oil-gas chamber 12 includes two liquid level sensors with different measuring principles; the two liquid level sensors with different measuring principles are a newly-installed liquid level sensor 121 and an inherent liquid level sensor 122 of the liquid level meter 1 .

[0046] Specifically, the liquid level meter 1 is used to measure the liquid height in the storage tank 2, the oil and gas chamber 12 is responsible for measuring the liquid level of the liquid in the storage tank 2, and the electrical chamber 11 is responsible for processing and transmitting the measured liquid level signal. The electrical chamber 11 includes at least two liquid level sensors with different measurement principles, that is, different liquid level sensors use different technologies or methods to measure liquid, and each liquid level sensor can independently give a liquid level measurement result. The electrical chamber 11 contains an output circuit 111, which receives the liquid level signals collected by each liquid level sensor in the oil and gas chamber 12, and processes and converts these signals to output each liquid level result. Optionally, the output circuit 111 includes components such as amplifiers, filters, and analog-to-digital converters (ADCs). In this embodiment, the liquid level meter 1 allows the use of multiple sensors with different measurement principles to measure the liquid level, thereby improving the reliability and accuracy of the measurement. At the same time, the output circuit 111 in the electrical chamber 11 can conveniently process and transmit these measured values, making it easy to be used by other devices or systems.

[0047] In an optional embodiment, if Figure 1 As shown, a common mounting flange 123 is also arranged in the oil-gas chamber 12; the newly-installed liquid level sensor 121 is fixed to the common mounting flange 123 in the oil-gas chamber 12 by flange bolts, so that the newly-installed liquid level sensor 121 and the inherent liquid level sensor 122 of the liquid level meter 1 share a mounting flange, and are connected to the storage tank 2 through the common mounting flange 123.

[0048] Specifically, in order to ensure that the common mounting flange 123 can closely cooperate with the newly installed liquid level sensor 121 and the liquid level meter 1, the common mounting flange 123 must simultaneously meet the installation hole position, size and installation requirements of the newly installed liquid level sensor 121 and the liquid level meter 1. During installation, the newly installed liquid level sensor 121 is fixed to the common mounting flange 123 in the liquid level meter 1 by flange bolts, and corresponding calibration and verification operations can be performed after installation, which can include testing at different liquid level heights to ensure that the sensor can accurately sense changes in the liquid level. In this embodiment, the common mounting flange 123 can save space and simplify the installation process. By designing a universal flange interface, these different types of liquid level sensors can share the same mounting point, which can not only reduce the workload during the installation process, but also reduce installation costs and maintenance costs.

[0049] In an optional embodiment, since the newly-installed liquid level sensor 121 is arranged in the oil and gas cavity 12 of the liquid level gauge 1, the newly-installed liquid level sensor 121 and the liquid level gauge 1 also share an electrical cavity 11, that is, the electrical parts of the newly-installed liquid level sensor 121 and the existing inherent liquid level sensor 122 of the liquid level gauge 1 are integrated in the same space. By integrating the newly-installed liquid level sensor 121 with the electrical parts of the liquid level gauge 1, the number of required cables and connectors can be reduced, the installation complexity can be reduced, and potential failure points can be reduced.

[0050] In an optional embodiment, a control mechanism 112 is arranged in the electrical chamber 11, and the electrical interface of the newly-installed liquid level sensor 121 is connected to the corresponding interface of the control mechanism 112;

[0051] The electrical interface of the inherent liquid level sensor 122 of the liquid level meter 1 is also connected to the corresponding interface of the control mechanism 112;

[0052] The control mechanism is suitable for controlling each of the liquid level sensors to measure the liquid level in the storage tank 2;

[0053] The output circuit 111 of the liquid level meter 1 is also suitable for outputting a current signal of 4 mA to 20 mA and a switch alarm signal.

[0054] Optionally, when the liquid level meter 1 is a servo-type liquid level meter, the control mechanism 112 may include a control sub-mechanism and a servo mechanism. The control sub-mechanism is responsible for receiving liquid level signals, making decisions and interacting with other systems, while the servo mechanism is responsible for executing instructions, adjusting sensor positions and achieving precise measurements. The two work closely together to ensure accurate measurement and stable operation of the liquid level meter 1.

[0055] Specifically, in a liquid level meter, a current signal of 4mA to 20mA usually indicates the height or change of the liquid level. For example, 4mA indicates the lowest liquid level, while 20mA indicates the highest liquid level. The intermediate values ​​between 4mA and 20mA correspond to different liquid level heights. In a liquid level meter, a switch alarm signal is usually used to indicate whether the liquid level has reached a preset safety or operating limit. For example, when the liquid level exceeds or falls below a certain safety threshold, the liquid level meter can send a switch alarm signal to trigger an alarm or take other safety measures.

[0056] For current signals of 4mA to 20mA, the liquid level meter 1 should have circuits inside that can generate this current range, and these circuits can accurately adjust the output current according to the actual measured value of the liquid level; for the switch alarm signal, this embodiment pre-configures the alarm threshold of the liquid level meter, and when the liquid level reaches the alarm threshold, the liquid level meter generates a corresponding switch output.

[0057] In an optional implementation, the liquid level meter 1 is a servo-type liquid level meter; the newly-installed liquid level sensor 121 is a radar-type liquid level sensor or an ultrasonic-type liquid level sensor.

[0058] For details, see Figure 2 When the liquid level meter is a servo type liquid level meter, the structure diagram of the liquid level meter is shown as follows: Figure 2 As shown, the liquid level meter 1 is a servo type liquid level meter, and also includes a hub 124 and a measuring ruler 125; the hub 124 is mainly used for guiding and positioning, and one end of the high-precision measuring ruler 125 is wound in the groove of the hub 124, which can prevent the measuring ruler 125 from slipping out of the groove of the hub 124 during the liquid level detection process, thereby ensuring the accuracy and stability of the measurement.

[0059] Optionally, the measuring ruler 125 may be a coded ruler tape or a coded steel wire.

[0060] Specifically, when the liquid level meter 1 is a servo-type liquid level meter, the inherent liquid level sensor 122 of the liquid level meter 1 includes a float, which is used to sense changes in the liquid level. When the liquid level changes, the float will move up and down with the rise and fall of the liquid level. Since the float is affected by the dual effects of gravity and buoyancy, when the liquid level changes, the position of the float will also change accordingly. When the float moves, it will drive the measuring ruler 125 connected to it, thereby changing the coupling difference between the outer magnet wheel and the inner magnet wheel of the hub 124. This coupling difference will produce a change in magnetic flux, which is then detected by an electromagnetic sensor (such as a Hall element). By measuring the change in this magnetic flux, the servo-type liquid level meter can accurately calculate the height of the liquid level.

[0061] To summarize, in this embodiment, at least two liquid level sensors are arranged in a liquid level meter. In addition to the inherent liquid level sensor of the liquid level meter, at least one new liquid level sensor is added in the oil and gas cavity of each liquid level meter, so that the new liquid level sensor and the inherent liquid level sensor of the liquid level meter respectively measure the liquid level in the storage tank, and collect at least two independent liquid level signals.

[0062] In this embodiment, a liquid level measuring device for a storage tank is also provided. Figure 3 As shown, the liquid level measuring device 3 includes: Figure 1 and Figure 2 The level gauge 1 is shown. Figure 3 The liquid level measuring device 3 is shown to include a structure of two liquid level meters.

[0063] Specifically, this embodiment applies a liquid level meter to a storage tank to constitute a liquid level measuring device 3 of the storage tank, so that the liquid level measuring device 3 of the storage tank can output multiple liquid level results at the same time. This not only meets the need of only two liquid stabilizing tubes when the equipment is installed, but also meets the need of outputting multiple liquid level results at the same time and providing interlocking signals for the safety interlocking system, so as to maximize the safety monitoring needs.

[0064] In an optional embodiment, the liquid level measuring device includes a first liquid level gauge and a second liquid level gauge;

[0065] The first liquid level gauge is provided with a first inherent liquid level sensor and a first newly installed liquid level sensor; the second liquid level gauge is provided with a second inherent liquid level sensor and a second newly installed liquid level sensor; the measurement principles of the first inherent liquid level sensor, the first newly installed liquid level sensor, the second inherent liquid level sensor and the second newly installed liquid level sensor are all different.

[0066] Specifically, the liquid level measuring device 3 of this embodiment includes two liquid level meters, ensuring that each liquid level meter achieves liquid stabilization or protection according to the installation standard; and four liquid level results can be output simultaneously to meet the safety monitoring needs to the greatest extent.

[0067] In an optional embodiment, the liquid level measuring device further comprises a common wiring terminal cavity 31;

[0068] The first electrical cable of the first liquid level meter is connected to the first electrical terminal in the common wiring terminal cavity; the second electrical cable of the second liquid level meter is connected to the second electrical terminal in the common wiring terminal cavity.

[0069] Specifically, when connecting the common terminal cavity 31, the cables and connectors of the level meter are installed in the common terminal cavity 31 according to the wiring requirements of the level meter to ensure that the cable connection is firm and reliable. The two level meters share a terminal cavity, which can reduce the number of cables and connectors required for installation, reduce installation complexity and cost, and in a limited space, sharing a terminal cavity can more effectively utilize space and reduce the occupied volume. By reducing the number of cables and connectors, potential failure points can be reduced, thereby improving the reliability of the system and facilitating maintenance. In this embodiment, the oil and gas cavity 12, the electrical cavity 11 and the common terminal cavity 31 are physically isolated. The physical isolation of the three cavities means that the three chambers are physically separated from each other, and there is no direct physical connection between them, which can prevent the medium (such as liquid or gas) in the oil and gas cavity 12 from directly contacting the electronic components in the electrical cavity 11, thereby avoiding potential fire or explosion hazards.

[0070] In an optional embodiment, the liquid level measuring device 3 further includes a common power supply 32; the first power supply end of the first liquid level meter is connected to the common power supply 32 via the first power supply connection terminal of the common wiring terminal cavity 31; the second power supply end of the second liquid level meter is connected to the common power supply 32 via the second power supply connection terminal of the common wiring terminal cavity 31;

[0071] Alternatively, the liquid level measuring device 3 also includes a first power supply and a second power supply; the first power supply end of the first liquid level meter is connected to the first power supply through the first power supply connection terminal of the common terminal cavity 31; the second liquid level meter is connected to the second power supply through the second power supply connection terminal of the common terminal cavity 31.

[0072] Specifically, this embodiment provides flexible options in terms of power supply settings. A shared power supply can reduce the number of cables and connectors, simplify the installation and maintenance process, and reduce the cost of power supply equipment and cables. Separate power supply can provide electrical isolation, reduce or eliminate electrical interference between different devices. If one of the level meters fails or requires maintenance, separate power supply can ensure that the other level meter continues to operate normally. Whether to share the power supply or separate the power supply depends on the specific application scenario and equipment requirements.

[0073] In an optional embodiment, the liquid level measuring device 3 further includes a common communication bus 33; the first communication end of the first liquid level meter is connected to the common communication bus 33 via the first communication connection terminal of the common wiring terminal cavity 31; the second communication end of the second liquid level meter is connected to the common communication bus 33 via the second communication connection terminal of the common wiring terminal cavity 31;

[0074] Alternatively, the liquid level measuring device 3 further comprises a signal cable, and the output circuit of the first liquid level meter is connected to the control mechanism of the second liquid level meter, so that the output circuit of the second liquid level meter simultaneously outputs the liquid level result measured by the first liquid level meter and the liquid level result measured by the second liquid level meter.

[0075] Specifically, through address allocation and communication protocol support, two level meters can share a communication bus and communicate independently. This configuration provides cost-effectiveness, flexibility and scalability, while ensuring that each level meter can independently and accurately send and receive data. When sharing a communication bus, it is necessary to ensure that the address of each level meter is unique, and the two level meters need to support the same communication protocol so that they can communicate on the same bus.

[0076] Specifically, when both liquid level meters support the same communication protocol, the output circuit of the first liquid level meter can be connected to the control mechanism of the second liquid level meter through a signal cable, so that the data of the first liquid level meter can be connected to the main board of the second liquid level meter, and the second liquid level meter can output two liquid level data at the same time through the communication protocol, thereby improving the flexibility and functionality of the system and reducing the need for additional hardware or wiring.

[0077] Optionally, the first liquid level gauge and the second liquid level gauge may share a CPU central processing unit, or the first liquid level gauge and the second liquid level gauge may use independent CPU central processing units respectively.

[0078] To sum up, the utility model arranges at least two liquid level sensors in a liquid level meter. In addition to the inherent liquid level sensor of the liquid level meter, at least one newly installed liquid level sensor is added in the oil and gas cavity of each liquid level meter, so that the newly installed liquid level sensor and the inherent liquid level sensor of the liquid level meter respectively measure the liquid level in the storage tank and collect at least two independent liquid level signals. In addition, the utility model applies the liquid level meter to the storage tank, so that the liquid level measuring device of the storage tank can output at least multiple independent liquid level results, which not only meets the need of only two liquid stabilizing tubes when the equipment is installed, but also meets the need of outputting multiple independent liquid level results at the same time, providing interlocking signals for the safety interlocking system, and can output liquid level results such as four-out-of-two or four-out-of-three to maximize the safety monitoring needs.

[0079] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A liquid level meter, characterized in that: The liquid level meter is arranged on the storage tank; the liquid level meter comprises an oil and gas chamber and an electrical chamber; At least two liquid level sensors are arranged in the oil-gas cavity, and the measurement principles of the liquid level sensors are different. The liquid level sensors are suitable for measuring the liquid level in the storage tank respectively to independently collect liquid level signals; The electrical chamber includes an output circuit, which is suitable for receiving the liquid level signals respectively collected by each of the liquid level sensors and outputting each liquid level result.

2. The liquid level meter according to claim 1, characterized in that: The oil-gas chamber includes two liquid level sensors with different measuring principles; the two liquid level sensors with different measuring principles are respectively a newly-installed liquid level sensor and an inherent liquid level sensor of the liquid level meter.

3. The liquid level meter according to claim 2, characterized in that: The liquid level meter is a servo type liquid level meter; the newly installed liquid level sensor is a radar type liquid level sensor or an ultrasonic type liquid level sensor.

4. The liquid level meter according to claim 3, characterized in that: A control mechanism is arranged in the electrical cavity, and the electrical interface of the newly-installed liquid level sensor is connected to a corresponding interface of the control mechanism; The control mechanism is suitable for controlling each of the liquid level sensors to measure the liquid level in the storage tank.

5. The liquid level meter according to any one of claims 2 to 4, characterized in that: A common mounting flange is arranged in the oil-gas cavity; the newly-installed liquid level sensor is fixed to the common mounting flange in the oil-gas cavity by flange bolts; The output circuit of the liquid level meter is also suitable for outputting a current signal of 4mA to 20mA and a switch alarm signal.

6. A liquid level measuring device for a storage tank, characterized in that: The liquid level measuring device comprises the liquid level meter according to any one of claims 1 to 5.

7. The liquid level measuring device according to claim 6, characterized in that: The liquid level measuring device comprises a first liquid level gauge and a second liquid level gauge; The first liquid level gauge is arranged with a first inherent liquid level sensor and a first newly installed liquid level sensor; the second liquid level gauge is arranged with a second inherent liquid level sensor and a second newly installed liquid level sensor; the measurement principles of the first inherent liquid level sensor, the first newly installed liquid level sensor, the second inherent liquid level sensor and the second newly installed liquid level sensor are all different.

8. The liquid level measuring device according to claim 7, characterized in that: The liquid level measuring device also includes a common wiring terminal cavity; The first electrical cable of the first liquid level meter is connected to the first electrical terminal in the common wiring terminal cavity; the second electrical cable of the second liquid level meter is connected to the second electrical terminal in the common wiring terminal cavity.

9. The liquid level measuring device according to claim 8, characterized in that: The liquid level measuring device also includes a common power supply; the first power supply end of the first liquid level meter is connected to the common power supply through the first power supply connection terminal of the common wiring terminal cavity; the second power supply end of the second liquid level meter is connected to the common power supply through the second power supply connection terminal of the common wiring terminal cavity; Alternatively, the liquid level measuring device also includes a first power supply and a second power supply; the first power supply end of the first liquid level meter is connected to the first power supply through the first power supply connection terminal of the common terminal cavity; the second liquid level meter is connected to the second power supply through the second power supply connection terminal of the common terminal cavity.

10. The liquid level measuring device according to claim 8, characterized in that: The liquid level measuring device also includes a common communication bus; the first communication end of the first liquid level meter is connected to the common communication bus through the first communication connection terminal of the common wiring terminal cavity; the second communication end of the second liquid level meter is connected to the common communication bus through the second communication connection terminal of the common wiring terminal cavity; Alternatively, the liquid level measuring device further comprises a signal cable, and the output circuit of the first liquid level meter is connected to the control mechanism of the second liquid level meter, so that the output circuit of the second liquid level meter simultaneously outputs the liquid level result measured by the first liquid level meter and the liquid level result measured by the second liquid level meter.

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