Liquefaction storage tank and tank car

Abstract

The utility model provides a liquefaction storage tank and a tank car. The liquefaction storage tank comprises a tank body, a first overflow pipe and a second overflow pipe, the tank body is connected with a liquid inlet pipe and a liquid outlet pipe, the tank body is further provided with a containing cavity, the containing cavity is used for containing liquefied natural gas, and a first temperature sensor is arranged in the containing cavity. The first overflow pipe is connected with the tank body, the first overflow pipe is provided with a first liquid outlet, the first liquid outlet is located in the containing cavity, a first electromagnetic valve is arranged in the first overflow pipe, the first electromagnetic valve is electrically connected with the first temperature sensor, and the first electromagnetic valve is used for connecting or disconnecting the first overflow pipe. The second overflow pipe is connected with the tank body, the second overflow pipe is provided with a second liquid outlet, the second liquid outlet is located in the containing cavity, the second liquid outlet is higher than the first liquid outlet, a second electromagnetic valve is arranged in the second overflow pipe, and the second electromagnetic valve is used for connecting or disconnecting the second overflow pipe. According to the structure, the risk of tank explosion can be avoided, and the safety of the liquefied storage tank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid storage and transportation, and particularly relates to a liquefied storage tank and a tank truck. Background Art

[0002] In recent years, liquefied natural gas has gradually become well-known as an economic, green, environmentally friendly and safe new energy source, and has become the recognized preferred green energy source in society. Liquefied natural gas has been vigorously promoted and applied in the field of public transportation, and has rapidly advanced into the ship fuel market.

[0003] To ensure the safety of the liquefied storage tank, when the existing liquefied storage tank is filled with liquefied natural gas, generally it does not exceed 90% of the liquefied natural gas capacity of the storage tank. The density of liquefied natural gas depends on its components and temperature, usually between 430 kg / m3 and 470 kg / m3, and the density change gradient with temperature is about 1.35 kg / (m3·°C). Therefore, when the temperature of the liquefied natural gas in the liquefied storage tank is too low, if it is still filled according to 90% of the capacity, when its temperature rises, the liquefied natural gas with too low temperature will have a large volume expansion, which is likely to increase the risk of tank explosion and result in low safety of the liquefied storage tank. Summary of the Invention

[0004] An object of the utility model is to solve the technical problem in the prior art that due to the temperature rise, the density of liquefied natural gas changes, and the risk of tank explosion is likely to occur.

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

[0006] A liquefied storage tank, comprising:

[0007] A tank body, the tank body is connected with a liquid inlet pipe and a liquid outlet pipe, the tank body is further provided with a containing cavity for containing liquefied natural gas, and a first temperature sensor is arranged in the containing cavity, and the first temperature sensor can sense the temperature of the liquefied natural gas in the containing cavity;

[0008] A first overflow pipe, the first overflow pipe is connected with the tank body, the first overflow pipe has a first liquid outlet, the first liquid outlet is located in the containing cavity, a first electromagnetic valve is arranged in the first overflow pipe, the first electromagnetic valve is electrically connected with the first temperature sensor, and the first electromagnetic valve is used for conducting or cutting off the first overflow pipe; and

[0009] A second overflow pipe, which is connected to the tank body. The second overflow pipe has a second liquid outlet, and the second liquid outlet is located in the accommodating cavity, and the height of the second liquid outlet is higher than that of the first liquid outlet. A second electromagnetic valve is arranged in the second overflow pipe, and the second electromagnetic valve is used to conduct or cut off the second overflow pipe, and the second electromagnetic valve is electrically connected to the first temperature sensor;

[0010] When the temperature sensed by the first temperature sensor is less than or equal to the first threshold, the first electromagnetic valve is opened and the second electromagnetic valve is closed; when the temperature sensed by the first temperature sensor is greater than the first threshold, the first electromagnetic valve is closed and the second electromagnetic valve is opened.

[0011] In one embodiment, the liquefied gas storage tank further includes a third electromagnetic valve, and the third electromagnetic valve is arranged on the liquid inlet pipe, and the third electromagnetic valve is electrically connected to the first temperature sensor, and the third electromagnetic valve is used to conduct or cut off the liquid inlet pipe.

[0012] In one embodiment, the liquefied gas storage tank further includes a first inductor, and the first inductor is arranged in the first overflow pipe and is electrically connected to the first electromagnetic valve and the third electromagnetic valve. The first inductor can sense whether liquefied natural gas flows into the first overflow pipe. When liquefied natural gas flows in, the first electromagnetic valve and the third electromagnetic valve are closed.

[0013] In one embodiment, the liquefied gas storage tank further includes a second inductor, and the second inductor is arranged in the second overflow pipe and is electrically connected to the second electromagnetic valve and the third electromagnetic valve. The second inductor can sense whether liquefied natural gas flows into the second overflow pipe. When liquefied natural gas flows in, the second electromagnetic valve and the third electromagnetic valve are closed.

[0014] In one embodiment, the first inductor is a second temperature sensor, and the second temperature sensor can sense the temperature in the first overflow pipe; when the temperature sensed by the second temperature sensor is less than or equal to the second threshold, the first electromagnetic valve and the third electromagnetic valve are closed, and the second threshold is less than the first threshold.

[0015] In one embodiment, the second inductor is a third temperature sensor, and the third temperature sensor can sense the temperature in the second overflow pipe. When the temperature sensed by the third temperature sensor is less than or equal to the second threshold, the second electromagnetic valve and the third electromagnetic valve are closed, and the second threshold is less than the first threshold.

[0016] In one embodiment, the first temperature sensor is arranged at the bottom of the accommodating cavity.

[0017] In one embodiment, the liquefied natural gas storage tank further includes a first alarm, which is disposed in the first overflow pipe. The first alarm can sense the liquefied natural gas in the first overflow pipe and issue a warning; and / or

[0018] The liquefied natural gas further includes a second alarm, which is disposed in the second overflow pipe. The second alarm can sense the liquefied natural gas in the second overflow pipe and issue a warning.

[0019] In one embodiment, the liquefied natural gas storage tank further includes a protective sleeve, which is sleeved on the outer periphery of the first temperature sensor.

[0020] The present utility model further provides another embodiment, a tanker truck, including a vehicle body and the liquefied natural gas storage tank according to any one of the above. The liquefied natural gas storage tank is disposed on the vehicle body, and the liquefied natural gas storage tank is a horizontal storage tank.

[0021] It can be seen from the above technical solutions that the present utility model has at least the following advantages and positive effects:

[0022] In the present utility model, liquefied natural gas is filled into the accommodation cavity of the tank body through the liquid inlet pipe. When the temperature of the liquefied natural gas is less than or equal to the first threshold, the first solenoid valve is opened and the second solenoid valve is closed. That is, when the temperature of the liquefied natural gas is less than or equal to the first threshold, the first overflow pipe is opened and the second overflow pipe is closed. When the liquefied natural gas is filled to the first liquid outlet, the liquefied natural gas flows out from the first overflow pipe, so that the liquefied natural gas is maintained at the first capacity of the storage tank.

[0023] When the temperature of the liquefied natural gas is greater than the first threshold, the first solenoid valve is closed and the second solenoid valve is opened. That is, when the temperature of the liquefied natural gas is greater than the first threshold, the first overflow pipe is closed and the second overflow pipe is opened. When the liquefied natural gas is filled to the first liquid outlet, the liquefied natural gas cannot flow out from the first overflow pipe, and the liquefied natural gas continues to be filled into the storage tank. When the liquefied natural gas is filled to the second liquid outlet, it flows out from the second overflow pipe, so that the liquefied natural gas is maintained at the second capacity of the storage tank. With such a setting, different volumes of liquefied natural gas are filled according to different temperatures, which can avoid the risk of tank explosion and improve the safety of the liquefied natural gas storage tank. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a liquefied natural gas storage tank in an embodiment of the present utility model.

[0025] The description of the reference numerals is as follows:

[0026] 100, tank body; 110, accommodation cavity; 120, first temperature sensor;

[0027] 200, First overflow pipe; 210, First solenoid valve; 220, Second temperature sensor;

[0028] 300, Second overflow pipe; 310, Second solenoid valve; 320, Third temperature sensor;

[0029] 400, Liquid inlet pipe; 410, Third solenoid valve;

[0030] 500, Liquid outlet pipe;

[0031] 600, Controller. Detailed implementation mode

[0032] Typical implementation modes reflecting the features and advantages of the present utility model will be described in detail in the following description. It should be understood that the present utility model can have various changes in different implementation modes, all of which do not depart from the scope of the present utility model, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present utility model.

[0033] In the description of the present 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", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0034] In one embodiment, a tanker truck includes a vehicle body and a liquefied storage tank. The liquefied storage tank is arranged on the vehicle body. In another embodiment, the liquefied storage tank can also be arranged on a transportation means such as a ship. The liquefied storage tank is a horizontal storage tank. Compared with a vertical storage tank, the horizontal storage tank has a lower center of gravity, making the horizontal storage tank more stable and safe during the filling of liquefied natural gas or during transportation.

[0035] In one embodiment, a liquefied storage tank includes a tank body 100, a first overflow pipe 200 and a second overflow pipe 300. Specifically, the tank body 100 can be a horizontal tank body.

[0036] Specifically, the tank body 100 is also provided with a containing cavity 110. The containing cavity 110 is used to contain liquefied natural gas. The temperature of the liquefied natural gas is extremely low. The temperature of the liquefied natural gas is generally lower than -165.5 °C. The tank body 100 is provided with a heat preservation structure, which can keep the cryogenic liquefied gas inside the tank body 100 at a low temperature for a long time, so that it is stored in the tank body 100 in a liquid state.

[0037] More specifically, a first temperature sensor 120 is arranged in the containing cavity 110. The first temperature sensor 120 can sense the temperature of the liquefied natural gas in the containing cavity 110.

[0038] Among them, the first temperature sensor 120 is arranged at the bottom of the containing cavity 110. When filling liquefied natural gas, the liquid level of the liquefied natural gas slowly rises from the bottom of the containing cavity 110. Arranging the first temperature sensor 120 at the bottom of the containing cavity 110 enables the first temperature sensor 120 to sense the temperature of the liquefied natural gas faster and more accurately.

[0039] Specifically, the liquefied natural gas storage tank further includes a protective sleeve. The liquefied natural gas is a cryogenic liquid. When the liquefied natural gas is in direct contact with the first temperature sensor 120, the first temperature sensor 120 is easily damaged. The protective sleeve is sleeved on the outer periphery of the first temperature sensor 120 to prevent the liquefied natural gas from directly contacting the first temperature sensor 120, thereby preventing the first temperature sensor 120 from being damaged.

[0040] Specifically, the tank body 100 is connected with a liquid inlet pipe 400. The external liquefied natural gas enters the tank body 100 through the liquid inlet pipe 400. More specifically, the liquid inlet pipe 400 can be arranged at the top of the tank body 100. A valve can be arranged on the liquid inlet pipe 400. The on-off of the liquid inlet pipe 400 is controlled by the valve. That is, when it is necessary to fill liquefied natural gas, the valve is opened to enable the external liquefied natural gas to enter the tank body 100. When it is necessary to stop filling liquefied natural gas, the valve is closed to cut off the external liquefied natural gas from entering the tank body 100.

[0041] Furthermore, the tank body 100 is connected with a liquid outlet pipe 500. The liquefied natural gas in the tank body 100 flows out through the liquid outlet pipe 500. Specifically, the liquid outlet pipe 500 can be arranged at the bottom of the tank body 100. The liquid outlet of the liquid outlet pipe 500 and the liquid inlet of the liquid inlet pipe 400 are arranged opposite to each other along the height direction of the tank body 100. A valve can be arranged on the liquid outlet pipe 500. The on-off of the liquid outlet pipe 500 is controlled by the valve. That is, when it is necessary to export liquefied natural gas, the valve is opened to enable the liquefied natural gas inside the tank body 100 to flow out to the outside. When it is necessary to stop exporting liquefied natural gas, the valve is closed to cut off the external liquefied natural gas from flowing out to the outside.

[0042] In one embodiment, the first overflow pipe 200 is connected to the tank body 100. The first overflow pipe 200 has a first liquid outlet. The first liquid outlet is located within the accommodation cavity 110. When the liquid level of the liquefied natural gas reaches the first liquid outlet, the liquefied natural gas overflows from the first overflow pipe 200 to the outside. A first solenoid valve 210 is provided on the first overflow pipe 200. The first solenoid valve 210 is electrically connected to the first temperature sensor 120. The first solenoid valve 210 is used to conduct or cut off the first overflow pipe 200.

[0043] Specifically, the second overflow pipe 300 is connected to the tank body 100. The second overflow pipe 300 has a second liquid outlet. The second liquid outlet is located within the accommodation cavity 110. When the liquid level of the liquefied natural gas reaches the second liquid outlet, the liquefied natural gas overflows from the second overflow pipe 300 to the outside. The height of the second liquid outlet is higher than the height of the first liquid outlet. For example, the height of the first liquid outlet can be 83% of the liquid level height of the entire tank body 100. The height of the second liquid outlet can be 90% of the liquid level height of the entire tank body 100. A second solenoid valve 310 is provided on the second overflow pipe 300. The second solenoid valve 310 is used to conduct or cut off the second overflow pipe 300. The second solenoid valve 310 is electrically connected to the first temperature sensor 120.

[0044] When the temperature sensed by the first temperature sensor 120 is less than or equal to the first threshold value, the first solenoid valve 210 is opened and the second solenoid valve 310 is closed. When the temperature sensed by the first temperature sensor 120 is greater than the first threshold value, the first solenoid valve 210 is closed and the second solenoid valve 310 is opened. Specifically, the first threshold value can be -140°C.

[0045] During operation, the liquefied natural gas is filled into the accommodation cavity 110 of the tank body 100 through the liquid inlet pipe 400. When the temperature of the liquefied natural gas is less than or equal to the first threshold value, the first solenoid valve 210 is opened and the second solenoid valve 310 is closed. That is, when the temperature of the liquefied natural gas is less than or equal to the first threshold value, the first overflow pipe 200 is opened and the second overflow pipe 300 is closed. When the liquefied natural gas is filled to the first liquid outlet, the liquefied natural gas flows out from the first overflow pipe 200, so that the liquefied natural gas remains at the first capacity of the storage tank.

[0046] When the temperature of the liquefied natural gas is greater than the first threshold value, the first solenoid valve 210 is closed and the second solenoid valve 310 is opened. That is, when the temperature of the liquefied natural gas is greater than the first threshold value, the first overflow pipe 200 is closed and the second overflow pipe 300 is opened. When the liquefied natural gas is filled to the first liquid outlet, the liquefied natural gas cannot flow out from the first overflow pipe 200, and the liquefied natural gas continues to be filled into the storage tank. When the liquefied natural gas is filled to the second liquid outlet, it flows out from the second overflow pipe 300, so that the liquefied natural gas is maintained at the second capacity of the storage tank. The volume of the second capacity is greater than the volume of the first capacity. With such a setting, different volumes of liquefied natural gas can be filled according to different temperatures, which can avoid the risk of tank explosion and improve the safety of the liquefied storage tank.

[0047] It should be noted that the mass of the liquefied natural gas filled in the tank body 100 is constant. The lower the temperature of the liquefied natural gas, the greater the density and the smaller the required volume. When the temperature of the liquefied natural gas is less than or equal to the first threshold value, the volume of the liquefied natural gas is the volume of the first capacity. The higher the temperature of the liquefied natural gas, the smaller the density and the larger the required volume. When the temperature of the liquefied natural gas is greater than the first threshold value, the volume of the liquefied natural gas is the volume of the second capacity.

[0048] In the related art, only an overflow pipe with a capacity of 90% is provided in the tank body. When the temperature of the liquefied natural gas is too high, the density of the liquefied natural gas is small and the required filling volume is large. When it is filled to 90% of the volume of the storage tank, the preset mass can be reached. At this time, the temperature of the liquefied natural gas has a small space for increase, that is, the expandable volume space is small, and the mass will not exceed the preset value. The 10% reserved space can meet the safety requirements. When the temperature of the liquefied natural gas is too low, the density of the liquefied natural gas is large and the required filling volume is small. Suppose that when it is filled to 83% of the capacity, the preset mass has been reached. When it is filled to 90% of the capacity, it has significantly exceeded the preset mass. At this time, the temperature of the liquefied natural gas has a large space for increase, that is, the expandable volume space is large, and the mass also exceeds the preset value. The 10% reserved space cannot meet the safety requirements, and there is a risk of tank explosion. For the liquefied storage tank of the present application, when the temperature of the liquefied natural gas is too low, the filling stops when the liquefied natural gas reaches the first overflow pipe. At this time, the liquefied storage tank also has a reserved space of 17%, which is larger than the 10% reserved space, and the liquefied natural gas will not exceed the preset mass, reducing the risk of tank explosion.

[0049] In an embodiment, the liquefied storage tank further includes a third solenoid valve 410. The third solenoid valve 410 is arranged on the liquid inlet pipe 400. The third solenoid valve 410 is electrically connected to the first temperature sensor 120. The third solenoid valve 410 is used to conduct or cut off the liquid inlet pipe 400. According to the temperature sensed by the first temperature sensor 120, the third solenoid valve 410 is opened or closed.

[0050] When liquefied natural gas flows out of the first overflow pipe 200 or the second overflow pipe 300, the third solenoid valve 410 closes, blocking the liquid inlet pipe 400 and stopping the refueling of liquefied natural gas. Compared with manually closing the liquid inlet pipe 400, setting the third solenoid valve 410 is more efficient and more automated.

[0051] In one embodiment, the liquefied gas storage tank further includes a controller 600. The controller 600 is electrically connected to the first solenoid valve 210, the second solenoid valve 310, the third solenoid valve 410, and the first temperature sensor 120 respectively. When the temperature sensed by the first temperature sensor 120 is less than or equal to the first threshold, the controller 600 controls the first solenoid valve 210 to open and the second solenoid valve 310 to close. When the temperature sensed by the first temperature sensor 120 is greater than the first threshold, the controller 600 controls the first solenoid valve 210 to close and the second solenoid valve 310 to open.

[0052] In one embodiment, the liquefied gas storage tank further includes a first inductor. The first inductor is disposed on the first overflow pipe 200 and is electrically connected to the first solenoid valve 210 and the third solenoid valve 410. The first inductor can sense whether liquefied natural gas flows into the first overflow pipe 200. When liquefied natural gas flows in, the first solenoid valve 210 and the third solenoid valve 410 close. With this setting, when liquefied natural gas is refueled to the first liquid outlet, the liquid inlet pipe 400 and the first overflow pipe 200 can be quickly closed. Specifically, the first inductor can be a temperature sensor, a flow rate sensor, a pressure sensor, etc.

[0053] Specifically, the first inductor can be electrically connected to the controller 600. When the first inductor senses that liquefied natural gas flows into the first overflow pipe 200, the controller 600 controls the first solenoid valve 210 and the third solenoid valve 410 to close.

[0054] In one embodiment, the first inductor can be a second temperature sensor 220. The second temperature sensor 220 can sense the temperature in the first overflow pipe 200. When the temperature sensed by the second temperature sensor 220 is less than or equal to the second threshold, the first solenoid valve 210 and the third solenoid valve 410 close. When liquefied natural gas enters the first overflow pipe 200, the temperature in the first overflow pipe 200 will quickly drop to the second threshold. That is, it can be determined whether there is liquefied natural gas overflow in the first overflow pipe 200 through the second temperature sensor 220.

[0055] Specifically, the second threshold is less than the first threshold. The second threshold can be -120 °C.

[0056] More specifically, the second temperature sensor 220 is electrically connected to the controller 600. When the temperature of the second temperature sensor 220 is lower than the second threshold, the controller 600 controls the first solenoid valve 210 and the third solenoid valve 410 to close.

[0057] More specifically, the liquefied gas storage tank further includes a second sensor disposed on the second overflow pipe 300 and electrically connected to the second solenoid valve 310 and the third solenoid valve 410. The second sensor can sense whether liquefied natural gas flows into the second overflow pipe 300. When liquefied natural gas flows in, the second solenoid valve 310 and the third solenoid valve 410 are closed. With such a setting, when liquefied natural gas is filled to the second liquid outlet, the liquid inlet pipe 400 and the second overflow pipe 300 can be quickly closed. Specifically, the second sensor can be a temperature sensor, a flow rate sensor, a pressure sensor, or the like.

[0058] Specifically, the second sensor can be electrically connected to the controller 600. When the second sensor senses that liquefied natural gas flows into the second overflow pipe 300, the controller 600 controls the second solenoid valve 310 and the third solenoid valve 410 to close.

[0059] In one embodiment, the second sensor can be the third temperature sensor 320. The third temperature sensor 320 can sense the temperature in the second overflow pipe 300. When the temperature sensed by the third temperature sensor 320 is less than or equal to the second threshold, the second solenoid valve 310 and the third solenoid valve 410 are closed. When liquefied natural gas enters the second overflow pipe 300, the temperature in the second overflow pipe 300 will quickly drop to the second threshold. That is, it can be determined whether there is liquefied natural gas overflowing in the second overflow pipe 300 through the third temperature sensor 320.

[0060] Specifically, the third temperature sensor 320 is electrically connected to the controller 600. When the temperature of the third temperature sensor 320 is lower than the second threshold, the controller 600 controls the second solenoid valve 310 and the third solenoid valve 410 to close.

[0061] In one embodiment, the liquefied gas storage tank further includes a first alarm. The first alarm is disposed on the first overflow pipe 200. The first alarm can sense the liquefied natural gas in the first overflow pipe 200 and give an alarm. When the first overflow pipe 200 overflows, the first alarm gives an alarm, thereby alerting the staff to ensure the safety of the liquefied gas storage tank. Specifically, the first alarm can be an audible and visual alarm.

[0062] Specifically, the liquefied natural gas further includes a second alarm. The second alarm is disposed on the second overflow pipe 300. The second alarm can sense the liquefied natural gas in the second overflow pipe 300 and give an alarm. When the first overflow pipe 200 overflows, the first alarm gives an alarm, thereby alerting the staff to ensure the safety of the liquefied gas storage tank. More specifically, the second alarm can be an audible and visual alarm.

[0063] In one embodiment, the liquefied storage tank further includes a display screen. The display screen, the first alarm, and the second alarm are all electrically connected to the controller 600. After the first alarm or the second alarm gives a warning, the staff can record the warning event on the display screen.

[0064] Although the present utility model has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present utility model can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A liquefied storage tank, characterized in that, Comprising: A tank body, the tank body is connected with a liquid inlet pipe and a liquid outlet pipe, the tank body is further provided with a containing cavity for containing liquefied natural gas, and a first temperature sensor is arranged in the containing cavity, and the first temperature sensor can sense the temperature of the liquefied natural gas in the containing cavity; A first overflow pipe, the first overflow pipe is connected with the tank body, the first overflow pipe has a first liquid outlet located in the containing cavity, a first electromagnetic valve is arranged in the first overflow pipe, the first electromagnetic valve is electrically connected with the first temperature sensor, and the first electromagnetic valve is used for conducting or cutting off the first overflow pipe; and A second overflow pipe, the second overflow pipe is connected with the tank body, the second overflow pipe has a second liquid outlet located in the containing cavity, and the height of the second liquid outlet is higher than that of the first liquid outlet. A second electromagnetic valve is arranged in the second overflow pipe, the second electromagnetic valve is used for conducting or cutting off the second overflow pipe, and the second electromagnetic valve is electrically connected with the first temperature sensor; When the temperature sensed by the first temperature sensor is less than or equal to a first threshold value, the first electromagnetic valve is opened and the second electromagnetic valve is closed; when the temperature sensed by the first temperature sensor is greater than the first threshold value, the first electromagnetic valve is closed and the second electromagnetic valve is opened.

2. The liquefied storage tank according to claim 1, wherein The liquefied storage tank further includes a third electromagnetic valve arranged on the liquid inlet pipe, and the third electromagnetic valve is electrically connected with the first temperature sensor, and the third electromagnetic valve is used for conducting or cutting off the liquid inlet pipe.

3. The liquefied storage tank according to claim 2, characterized in that, The liquefied storage tank further includes a first inductor arranged in the first overflow pipe and electrically connected with the first electromagnetic valve and the third electromagnetic valve. The first inductor can sense whether liquefied natural gas flows into the first overflow pipe. When liquefied natural gas flows in, the first electromagnetic valve and the third electromagnetic valve are closed.

4. The liquefied storage tank according to claim 2, wherein The liquefied storage tank further includes a second inductor arranged in the second overflow pipe and electrically connected with the second electromagnetic valve and the third electromagnetic valve. The second inductor can sense whether liquefied natural gas flows into the second overflow pipe. When liquefied natural gas flows in, the second electromagnetic valve and the third electromagnetic valve are closed.

5. The liquefied storage tank according to claim 2, characterized in that, The first inductor is a second temperature sensor, and the second temperature sensor can sense the temperature in the first overflow pipe; when the temperature sensed by the second temperature sensor is less than or equal to a second threshold value, the first electromagnetic valve and the third electromagnetic valve are closed, and the second threshold value is less than the first threshold value.

6. The liquefied storage tank according to claim 2, wherein, The second inductor is a third temperature sensor, and the third temperature sensor can sense the temperature in the second overflow pipe. When the temperature sensed by the third temperature sensor is less than or equal to the second threshold value, the second electromagnetic valve and the third electromagnetic valve are closed, and the second threshold value is less than the first threshold value.

7. The liquefied storage tank according to claim 1, characterized in that, The first temperature sensor is arranged at the bottom of the containing cavity.

8. The liquefied storage tank according to claim 1, wherein, The liquefied gas storage tank further includes a first alarm, which is arranged in the first overflow pipe. The first alarm can sense the liquefied natural gas in the first overflow pipe and give an alarm; and / or The liquefied natural gas further includes a second alarm, which is arranged in the second overflow pipe. The second alarm can sense the liquefied natural gas in the second overflow pipe and give an alarm.

9. The liquefied storage tank according to claim 1, characterized in that, The liquefied gas storage tank further includes a protective sleeve, which is sleeved on the outer periphery of the first temperature sensor.

10. A tanker truck, characterized in that, It includes a vehicle body and the liquefied gas storage tank according to any one of claims 1 to 9. The liquefied gas storage tank is arranged on the vehicle body, and the liquefied gas storage tank is a horizontal storage tank.

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