Liquid inlet and outlet control system of storage tank

Abstract

The utility model provides a storage tank liquid inlet and outlet control system. The storage tank liquid inlet and outlet control system comprises a liquid outlet pipeline, a pressure relief pipeline, a backflow pipeline and a controller. The liquid outlet pipeline is communicated between the liquid outlet storage tank and the liquid storage tank, and the liquid outlet pipeline is sequentially communicated with a liquid outlet flow meter, a hydraulic pump and a pressure regulating valve. One end of the pressure relief pipeline is communicated between the hydraulic pump and the pressure regulating valve, and the other end of the pressure relief pipeline is communicated with the liquid outlet storage tank, so that the pressure in the downstream pipeline of the hydraulic pump is reduced when the pressure in the downstream pipeline of the hydraulic pump exceeds a preset value. A pressure relief flow meter is arranged on the pressure relief pipeline and used for measuring the pressure relief amount in the pressure relief pipeline. The backflow pipeline is communicated between the liquid storage tank and the liquid outlet storage tank and used for liquid backflow. A backflow flow meter is arranged on the backflow pipeline and used for measuring the backflow amount in the backflow pipeline. The controller is in signal connection with the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter so as to collect the outflow amount, the pressure relief amount and the backflow amount and judge whether leakage happens to the control system or not, and operation safety of the system is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid transportation technical field, especially a kind of storage tank inlet and outlet liquid control system. BACKGROUND

[0002] In the storage tank inlet and outlet liquid system, by setting flowmeter on pipeline and collecting flow information of important position, to ensure that inlet and outlet liquid safe and reliable operation and realize liquid volume accurate control.

[0003] However, in the conventional storage tank inlet and outlet liquid system, generally by temperature sensor, pressure sensor and liquid level sensor to monitor and control pipeline and container. This monitoring method is difficult to accurately monitor and quantify the flow in the container and pipeline, difficult to carry out quantitative operation and monitoring, prone to dangerous situation. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of storage tank inlet and outlet liquid control system, it can monitor the flow of liquid in pipeline in real time, and ensure the safety of inlet and outlet liquid system.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] According to one aspect of the utility model, the utility model provides a kind of storage tank inlet and outlet liquid control system, intercommunication between outlet liquid storage tank and liquid storage tank, the storage tank inlet and outlet liquid control system includes: outlet liquid pipeline, intercommunication between the outlet liquid storage tank and the liquid storage tank;The outlet liquid direction of the outlet liquid pipeline is provided with outlet liquid flowmeter, hydraulic pump and pressure regulating valve that are sequentially interconnected;The outlet liquid flowmeter is used to measure the outflow of the outlet liquid storage tank, the hydraulic pump is used to pressurize the liquid in the outlet liquid storage tank and then deliver to the liquid storage tank, and the pressure regulating valve is used to control the pressure in the downstream pipeline of the hydraulic pump;Pressure relief pipeline, one end intercommunication between the hydraulic pump and the pressure regulating valve, the other end intercommunication the outlet liquid storage tank;When the pressure in the downstream pipeline of the hydraulic pump exceeds preset value, the pressure relief pipeline can guide part of the liquid in the downstream pipeline of the hydraulic pump back to the outlet liquid storage tank to reduce the pressure in the downstream pipeline of the hydraulic pump;Pressure relief flowmeter is arranged on the pressure relief pipeline, and the pressure relief flowmeter is used to measure the pressure relief amount in the pressure relief pipeline;Backflow pipeline, intercommunication between the liquid storage tank and the outlet liquid storage tank, to be used for backflow liquid;Backflow flowmeter is arranged on the backflow pipeline, and the backflow flowmeter is used to measure the backflow in the backflow pipeline;Controller, signal connection outlet liquid flowmeter, pressure relief flowmeter and backflow flowmeter, to be used for collecting the outflow, pressure relief amount and backflow, and monitoring the operation of control system according to the outflow, pressure relief amount and backflow.

[0007] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0008] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0009] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0010] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0011] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0012] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0013] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0014] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0015] In an embodiment of the present application, the liquid outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter is larger than that of the pressure relief flow meter; the diameter of the backflow flow meter is larger than that of the liquid outlet flow meter.

[0016] From the above technical scheme can know, the utility model at least has the following advantages and positive effect:

[0017] In the utility model, the storage tank inlet and outlet liquid control system includes liquid outlet pipeline, pressure relief pipeline, backflow pipeline and controller. Among them, the liquid outlet pipeline is communicated between the liquid outlet storage tank and the liquid storage tank, and the liquid outlet pipeline is sequentially communicated with the liquid outlet flowmeter, the hydraulic pump and the pressure regulating valve, the liquid outlet flowmeter is used for measuring the outflow of the liquid in the liquid outlet storage tank, the hydraulic pump is used for pressurizing the liquid in the liquid outlet storage tank and conveying to the liquid storage tank, and the pressure regulating valve is used for controlling the pressure in the downstream pipeline of the hydraulic pump, to ensure the infusion efficiency. One end of the pressure relief pipeline is communicated between the hydraulic pump and the pressure regulating valve, and the other end is communicated with the liquid outlet storage tank, so that when the pressure in the downstream pipeline of the hydraulic pump exceeds the preset value, the pressure relief pipeline can guide part of the liquid in the downstream pipeline of the hydraulic pump to the liquid outlet storage tank, to reduce the pressure in the downstream pipeline of the hydraulic pump. At the same time, the pressure relief pipeline is provided with a pressure relief flowmeter for measuring the pressure relief amount in the pressure relief pipeline. The backflow pipeline is communicated between the liquid storage tank and the liquid outlet storage tank, for backflow liquid. The backflow pipeline is provided with a backflow flowmeter for measuring the backflow amount in the backflow pipeline. The controller is signal connected with the liquid outlet flowmeter, the pressure relief flowmeter and the backflow flowmeter, to collect the outflow, the pressure relief amount and the backflow amount, and to determine whether the control system leaks according to the outflow, the pressure relief amount and the backflow amount information, and to ensure the operation safety of the system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the principle schematic diagram of the storage tank inlet and outlet liquid control system of the utility model embodiment.

[0019] The following is explained:

[0020] 1-liquid outlet storage tank;2-liquid storage tank;10-liquid outlet pipeline;11-liquid outlet flowmeter;12-hydraulic pump;13-pressure regulating valve;14-first stop valve;15-first control valve;16-pressure transmitter;20-pressure relief pipeline;21-pressure relief flowmeter;22-check valve;30-backflow pipeline;31-backflow flowmeter;32-second stop valve;33-second control valve;40-liquid level meter. DETAILED DESCRIPTION

[0021] The typical embodiments embodying the features and advantages of the utility model will be described in detail in the following description. It should be understood that the utility model can have various changes on different embodiments, which do not deviate from the scope of the utility model, and the description and drawings in essence are used for illustration, not to limit the utility model.

[0022] In the description of the utility model, it is understood that in the embodiment shown in the drawings, the indication of direction or position relationship (such as up, down, left, right, front and back) is only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. When these elements are in the position shown in the drawing, these descriptions are appropriate. If the position of these elements changes, the direction of the indication also changes accordingly.

[0023] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0024] In the field of liquid hydrogen storage and application, liquid storage needs to be transferred within a specific hydraulic interval when discharging. Therefore, when the liquid pressure is too low, a hydraulic pump is needed to convert low-pressure liquid into high-pressure liquid, and then the high-pressure liquid is transferred to the gas equipment.

[0025] In the traditional tank liquid inlet and outlet system, a temperature sensor, a pressure sensor and a liquid level sensor are generally used to monitor and control the pipeline and the container. This monitoring method is difficult to accurately monitor and quantify the flow in the container and the pipeline, and it is difficult to perform quantitative operation and monitoring, which can easily lead to dangerous situations. Therefore, a tank liquid inlet and outlet control system is proposed to solve the above problems.

[0026] The scheme is further illustrated by the following embodiments:

[0027] Figure 1 It is a principle schematic diagram of the tank liquid inlet and outlet control system of the utility model embodiment.

[0028] Please refer to Figure 1 The tank liquid inlet and outlet control system of the embodiment is connected between the liquid outlet tank 1 and the liquid storage tank 2, so as to transfer the liquid in the liquid outlet tank 1 to the liquid storage tank 2 after pressurization. Among them, the liquid outlet tank 1 and the liquid storage tank 2 can store liquid hydrogen, liquid natural gas and the like. The liquid outlet tank 1 can be a container tank truck or a skid-mounted tank truck for storing liquid hydrogen, and the liquid storage tank 2 can be a tank provided in a hydrogen filling station or a tank in a gas equipment.

[0029] Please refer to Figure 1 The tank liquid inlet and outlet control system can include a liquid outlet pipeline 10, a pressure relief pipeline 20, a backflow pipeline 30 and a controller.

[0030] Specifically, the liquid outlet pipeline 10 is connected between the liquid outlet storage tank 1 and the liquid storage tank 2, and a liquid outlet flow meter 11, a hydraulic pump 12 and a pressure regulating valve 13 are sequentially connected in the liquid outlet direction of the liquid outlet pipeline 10. Among them, the liquid outlet flow meter 11 is used to measure the outflow of the liquid outlet storage tank 1, the hydraulic pump 12 is used to pressurize the liquid in the liquid outlet storage tank 1 and deliver it into the liquid storage tank 2, that is, the hydraulic pump 12 is used to drive the liquid in the liquid outlet storage tank 1 to flow and be pressurized, so that the pressurized liquid is delivered into the liquid storage tank 2 along the liquid outlet pipeline 10. The pressure regulating valve 13 is used to control the pressure in the pipeline downstream of the hydraulic pump 12 to prevent the pressure in the liquid outlet pipeline 10 downstream of the hydraulic pump 12 from being too high, affecting the safety and efficiency of liquid delivery.

[0031] At the same time, one end of the pressure relief pipeline 20 is connected between the hydraulic pump 12 and the pressure regulating valve 13, and the other end is connected to the liquid outlet storage tank 1. When the pressure in the liquid outlet pipeline 10 downstream of the hydraulic pump 12 exceeds the preset value, the pressure relief pipeline 20 can guide part of the liquid in the pipeline downstream of the hydraulic pump 12 back into the liquid outlet storage tank 1, thereby reducing the pressure in the pipeline downstream of the hydraulic pump 12, so that the pressure in the liquid outlet pipeline 10 downstream of the hydraulic pump 12 is within the preset pressure range, ensuring the safety and efficiency of liquid delivery of the liquid outlet pipeline 10.

[0032] In this embodiment, the pressure relief pipeline 20 is provided with a pressure relief flow meter 21, and the pressure relief flow meter 21 is used to measure the pressure relief amount in the pressure relief pipeline 20, that is, the pressure relief flow meter 21 is used to measure the flow from the pressure relief pipeline 20 to the liquid outlet storage tank 1.

[0033] In addition, the backflow pipeline 30 is connected between the liquid storage tank 2 and the liquid outlet storage tank 1 to backflow liquid, thereby ensuring the flow efficiency of the liquid between the liquid storage tank 2 and the liquid outlet storage tank 1.

[0034] Among them, the backflow pipeline 30 is provided with a backflow flow meter 31, and the backflow flow meter 31 is used to measure the backflow amount in the backflow pipeline 30, that is, the backflow flow meter 31 is used to measure the flow from the liquid storage tank 2 to the liquid outlet storage tank 1.

[0035] It should be noted that the liquid outlet flow meter 11, the pressure relief flow meter 21 and the backflow flow meter 31 are all electromagnetic flow meters, and the diameter of the liquid outlet flow meter 11 is greater than that of the pressure relief flow meter 21, and the diameter of the backflow flow meter 31 is greater than that of the liquid outlet flow meter 11, so as to ensure that the liquid outlet flow meter 11, the pressure relief flow meter 21 and the backflow flow meter 31 can normally operate and accurately measure and read the flow data in each pipeline.

[0036] In the embodiment, the controller can be signal connected with the outflow flowmeter 11, the pressure relief flowmeter 21 and the backflow flowmeter 31. Specifically, the outflow flowmeter 11, the pressure relief flowmeter 21 and the backflow flowmeter 31 are each provided with a communication component, so that the outflow flowmeter 11, the pressure relief flowmeter 21 and the backflow flowmeter 31 can be connected with the controller through the communication components, thereby enabling the controller to remotely read the data of the outflow, the pressure relief and the backflow collected by the outflow flowmeter 11, the pressure relief flowmeter 21 and the backflow flowmeter 31 respectively, and monitor the operation of the control system according to the outflow, the pressure relief and the backflow.

[0037] Specifically, when the outflow is equal to the sum of the pressure relief and the backflow, the in-out liquid control system works normally. When the outflow is greater than the sum of the pressure relief and the backflow, the in-out liquid control system leaks, and a dangerous situation occurs, in which case the controller will issue an alarm and stop the operation of the in-out liquid control system to ensure the safety of the system.

[0038] In addition, the controller can also be connected with the hydraulic pump 12 to control the start or stop of the hydraulic pump 12.

[0039] Referring to Figure 1 The in-out liquid control system of the storage tank can also include a pressure transmitter 16. The pressure transmitter 16 can be connected to the outflow pipeline 10 and located upstream of the hydraulic pump 12 to measure the pressure in the outflow pipeline 10 upstream of the hydraulic pump 12, so as to ensure that the pressure in the outflow pipeline 10 is within the working pressure range of the hydraulic pump 12, and avoid excessive or insufficient pressure in the pipeline upstream of the hydraulic pump 12. That is, the pressure transmitter 16 can be used to measure the pressure in the pipeline on the inlet side of the hydraulic pump 12, so as to ensure that the liquid pressure in the pipeline on the inlet side of the hydraulic pump 12 is within the working pressure of the hydraulic pump 12.

[0040] Of course, the pressure transmitter 16 can also be connected to the outflow storage tank 1 to measure the pressure in the outflow storage tank 1.

[0041] In the embodiment, the range of the pressure transmitter 16 is between 0 Mpa and 1.2 Mpa, and the inlet pressure of the hydraulic pump 12 is not less than 0.3 Mpa, thereby ensuring the normal operation of the hydraulic pump 12.

[0042] In addition, the pressure transmitter 16 is also communicatively connected with the controller, so that the controller can control the start or stop of the hydraulic pump 12 according to the pressure data fed back by the pressure transmitter 16.

[0043] In the embodiment, the in-out liquid control system of the storage tank can also include a check valve 22. The check valve 22 is connected to the pressure relief pipeline 20 and located upstream of the pressure relief flowmeter 21 to limit the backflow of the liquid in the pressure relief pipeline 20, thereby avoiding the liquid in the outflow storage tank 1 being directly delivered to the storage tank 2 along the pressure relief pipeline 20 and the outflow pipeline 10.

[0044] In addition, the tank liquid inlet and outlet control system can further comprise a first stop valve 14 and a second stop valve 32. The first stop valve 14 is connected to the outlet pipeline 10 and located upstream of the outlet flow meter 11, so that the liquid in the outlet tank 1 flows along the outlet pipeline 10 to the pressure relief flow meter 21. The second stop valve 32 is connected to the return pipeline 30 and located upstream of the return flow meter 31, so that the liquid in the return tank 2 flows along the return pipeline 30 to the return flow meter 31. Specifically, the first stop valve 14 or the second stop valve 32 is used to cut off or adjust the flow of liquid in the outlet pipeline 10 or the return pipeline 30, so as to adjust the liquid flow in the outlet pipeline 10 and the return pipeline 30 through the first stop valve 14 and the second stop valve 32, respectively.

[0045] Referring to Figure 1 , the tank liquid inlet and outlet control system can further comprise a first control valve 15 and a second control valve 33. The first control valve 15 is connected to the outlet pipeline 10 and located downstream of the pressure regulating valve 13, so as to open or shut off the outlet pipeline 10. The second control valve 33 is connected to the return pipeline, so as to open or shut off the return pipeline.

[0046] It should be noted that the first control valve 15 and the second control valve 33 can be connected to the controller in communication, so that when the system is in danger, the controller can control the first control valve 15 and the second control valve 33 to shut off, so as to shut off the outlet pipeline 10 and the return pipeline 30.

[0047] In this embodiment, the tank liquid inlet and outlet control system can further comprise a liquid level meter 40. The liquid level meter 40 is connected to the outlet tank 1, so as to measure the liquid level in the outlet tank 1. At the same time, the liquid level meter 40 can also be connected to the controller or the background management center in communication, so that the controller or the background management center can measure the remaining amount of liquid in the outlet tank 1.

[0048] In summary, the liquid outlet pipeline 10 is communicated between the liquid outlet storage tank 1 and the liquid storage tank 2, and the liquid outlet pipeline 10 is communicated with the liquid outlet flow meter 11, the hydraulic pump 12 and the pressure regulating valve 13 in sequence, the liquid outlet flow meter 11 is used for measuring the outflow of the liquid in the liquid outlet storage tank 1, the hydraulic pump 12 is used for pressurizing the liquid in the liquid outlet storage tank 1 and then conveying the liquid to the liquid storage tank 2, and the pressure regulating valve 13 is used for controlling the pressure in the pipeline downstream of the hydraulic pump 12 to ensure the infusion efficiency. One end of the pressure relief pipeline 20 is communicated between the hydraulic pump 12 and the pressure regulating valve 13, and the other end is communicated with the liquid outlet storage tank 1, so that when the pressure in the pipeline downstream of the hydraulic pump 12 exceeds the preset value, the pressure relief pipeline 20 can guide part of the liquid in the pipeline downstream of the hydraulic pump 12 to the liquid outlet storage tank 1 to reduce the pressure in the pipeline downstream of the hydraulic pump 12. At the same time, the pressure relief pipeline 20 is provided with the pressure relief flow meter 21 for measuring the pressure relief amount in the pressure relief pipeline 20. The return pipeline 30 is communicated between the liquid storage tank 2 and the liquid outlet storage tank 1 to return the liquid. The return pipeline 30 is provided with the return flow meter 31 for measuring the return amount in the return pipeline 30. The controller is connected with the liquid outlet flow meter 11, the pressure relief flow meter 21 and the return flow meter 31 to collect the outflow, the pressure relief amount and the return amount, and to determine whether the control system leaks according to the outflow, the pressure relief amount and the return amount, thereby ensuring the operation safety of the system.

[0049] Although the present application has been described with reference to several exemplary embodiments, it is understood that the words that have been used are words of description and illustration, rather than words of limitation. As the application can be embodied in many different forms without departing from the spirit or essential characteristics thereof, it is understood that the present application is not limited to any particular described embodiments described above, but is instead defined by the appended claims in their broadest form, and equivalents thereof, and all changes and modifications that come within the meaning and range of equivalents of the claims are therefore intended to be embraced by the claims.

Claims

1. A tank in-out liquid control system which is connected between an out-liquid tank and an in-liquid tank, characterized by, The tank inlet and outlet liquid control system comprises: An outlet pipeline is communicated between the outlet tank and the storage tank; an outlet flow meter, a hydraulic pump and a pressure regulating valve are sequentially communicated in the outlet direction of the outlet pipeline; the outlet flow meter is used for measuring the outflow of the outlet tank, the hydraulic pump is used for pressurizing the liquid in the outlet tank and delivering it into the storage tank, and the pressure regulating valve is used for controlling the pressure in the pipeline downstream of the hydraulic pump; A pressure relief pipeline is communicated between the hydraulic pump and the pressure regulating valve at one end and communicated with the outlet tank at the other end; when the pressure in the pipeline downstream of the hydraulic pump exceeds a preset value, the pressure relief pipeline can guide part of the liquid in the pipeline downstream of the hydraulic pump back into the outlet tank to reduce the pressure in the pipeline downstream of the hydraulic pump; a pressure relief flow meter is arranged on the pressure relief pipeline, and the pressure relief flow meter is used for measuring the pressure relief amount in the pressure relief pipeline; A backflow pipeline is communicated between the storage tank and the outlet tank for backflow liquid; a backflow flow meter is arranged on the backflow pipeline, and the backflow flow meter is used for measuring the backflow amount in the backflow pipeline; A controller is signal-connected with the outlet flow meter, the pressure relief flow meter and the backflow flow meter for collecting the outflow, the pressure relief amount and the backflow amount and monitoring the operation of the control system according to the outflow, the pressure relief amount and the backflow amount.

2. The tank access control system of claim 1, wherein, The outlet flow meter, the pressure relief flow meter and the backflow flow meter are all electromagnetic flow meters, and the caliber of the outlet flow meter is larger than that of the pressure relief flow meter; the caliber of the backflow flow meter is larger than that of the outlet flow meter.

3. The tank access control system of claim 1, wherein, Communication components are arranged on the outlet flow meter, the pressure relief flow meter and the backflow flow meter, so that the outlet flow meter, the pressure relief flow meter and the backflow flow meter can be connected with the controller through the communication components.

4. The tank access control system of claim 1, wherein, A pressure transmitter is further included; the pressure transmitter is communicated on the outlet pipeline and located on the inlet side of the hydraulic pump for measuring the pressure in the pipeline upstream of the hydraulic pump in the outlet pipeline.

5. The tank access control system of claim 1, wherein, A check valve is further included; the check valve is communicated on the pressure relief pipeline and located upstream of the pressure relief flow meter to limit the backflow of the liquid in the pressure relief pipeline.

6. The tank access control system of claim 1, wherein, A first stop valve is further included; the first stop valve is communicated on the outlet pipeline and located upstream of the outlet flow meter; when the first stop valve is turned on, the liquid in the outlet tank can flow to the outlet flow meter along the outlet pipeline.

7. The tank access control system of claim 1, wherein A second stop valve is further included; the second stop valve is communicated on the backflow pipeline and located upstream of the backflow flow meter; when the second stop valve is turned on, the liquid in the storage tank can flow to the backflow flow meter along the backflow pipeline.

8. The tank access control system of claim 1, wherein, A first control valve is further included; the first control valve is communicated on the outlet pipeline and located downstream of the pressure regulating valve to turn on or shut off the outlet pipeline.

9. The tank access control system of claim 1, wherein, A second control valve is further included; the second control valve is communicated on the backflow pipeline to turn on or shut off the backflow pipeline.

10. The tank access control system of claim 1, wherein, A liquid level meter is further included; the liquid level meter is communicated on the outlet tank to measure the liquid level in the outlet tank.

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