Pressure balancing device for liquid storage tank

Abstract

The utility model provides a pressure balancing device for a liquid storage tank, which belongs to the technical field of chemical engineering and comprises a partition plate, a pressure balancing mechanism, a balancing pipeline mechanism and a control mechanism. The partition plate is arranged in the liquid storage tank and provided with an air inlet and an air outlet. The pressure balance mechanism comprises a balance shell and a pressure air bag, and the pressure air bag is arranged in the balance shell; the balance pipeline mechanism comprises an air inlet pipeline, a first air outlet pipeline and a second air outlet pipeline; the air inlet pipeline is connected with the air inlet and the pressure air bag; the first gas outlet pipeline is connected with the pressure airbag and a gas phase port of the tank car; the second air outlet pipeline is connected with the pressure airbag and the air outlet; and the control mechanism is arranged on the pipeline balancing mechanism. According to the pressure balancing device of the liquid storage tank, when the internal pressure of the liquid storage tank is too large or too small, the pressure air bag absorbs or releases air by means of the pressure air bag and the second air inlet pipeline, the internal pressure of the liquid storage tank is guaranteed to be stable, and then the liquid storage tank is better protected.

Description

Technical Field

[0001] This utility model belongs to the field of chemical technology, specifically relating to a pressure balancing device for a liquid storage tank. Background Technology

[0002] In numerous fields such as industrial production, chemical engineering, and energy, liquid storage tanks are extremely common and crucial pieces of equipment used to store various liquid raw materials, products, or intermediate media. These liquids may possess different physical and chemical properties, such as flammability, explosiveness, toxicity, and corrosiveness. During the filling or storage of raw materials, maintaining stable and balanced pressure is of paramount importance in liquid storage tanks.

[0003] Currently, when filling raw materials, a balance tank is generally used to connect the storage tank and the tank truck to balance the pressure between the two. At the same time, a control valve is installed on the storage tank to control the pressure inside the storage tank when the pressure is too high or too low. However, this method makes it easy for raw materials to leak into the air, thereby polluting the air. Utility Model Content

[0004] This utility model provides a pressure balancing device for a liquid storage tank to solve the technical problem in the prior art where the use of control valves to control the pressure of liquid storage tanks leads to the easy leakage of raw materials into the air.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a pressure balancing device for a liquid storage tank, comprising:

[0006] A partition plate is disposed inside the liquid storage tank and divides the interior of the liquid storage tank into a balance chamber and a liquid storage chamber; the liquid inlet and liquid outlet of the liquid storage tank are both located in the liquid storage chamber; the partition plate has an air inlet and an air outlet, and the air inlet and the air outlet are both located in the gas phase region of the liquid storage chamber;

[0007] A pressure balancing mechanism is provided in the balancing chamber; the pressure balancing mechanism includes a balancing shell and a pressure bladder; the balancing shell is fixedly connected to the inner wall of the liquid storage tank; the pressure bladder is located inside the balancing shell;

[0008] A balancing pipeline mechanism is disposed within the balancing chamber; the balancing pipeline mechanism includes an air inlet pipe, a first air outlet pipe, and a second air outlet pipe; one end of the air inlet pipe is connected to the air inlet, and the other end is connected to the pressure bladder; one end of the first air outlet pipe is connected to the pressure bladder, and the other end passes through the tank body of the storage tank and connects to the gas phase port of the tank truck; one end of the second air outlet pipe is connected to the pressure bladder, and the other end is connected to the air outlet;

[0009] A control mechanism, located on the balance pipeline mechanism, is used to control the opening or closing of the air inlet pipe, the first air outlet pipe, and the second air outlet pipe.

[0010] In one possible implementation, the control mechanism includes a first control valve and a second control valve; the first control valve is located on the first air outlet pipe; and the second control valve is located on the second air outlet pipe.

[0011] In one possible implementation, the control mechanism further includes a first sensor, a second sensor, and a pressure-resistant assembly; both the first and second sensors are located within the balance housing and are positioned opposite each other; the first sensor is electrically connected to the first control valve; the second sensor is electrically connected to the second control valve; the pressure-resistant assembly is located between the pressure bladder and the second sensor, and the pressure-resistant assembly has the freedom to move along the inner wall of the balance housing toward or away from the second sensor, to prevent the second control valve from controlling the opening of the second air outlet pipe when raw materials are added; a sealing plate is provided on the first air outlet pipe for sealing the first air outlet pipe.

[0012] In one possible implementation, the pressure-resistant assembly includes a pressure-resistant plate and a plurality of elastic elements; the pressure-resistant plate is located between the pressure bladder and the second sensor and is slidably connected to the balance housing; the plurality of elastic elements are respectively disposed on the upper and lower sides of the second sensor, and the two ends of the elastic elements are respectively connected to the inner walls of the pressure-resistant plate and the balance housing.

[0013] In one possible implementation, the pressure balancing mechanism further includes two fixing plates; the two fixing plates are respectively disposed on opposite sides of the balancing shell, and one end of the fixing plate is connected to the balancing shell, and the other end is connected to the inner wall of the tank.

[0014] In one possible implementation, the intake pipe is provided with a heating jacket.

[0015] In one possible implementation, the fixing plate is provided with a heater, which is connected to the heating jacket.

[0016] In one possible implementation, the second exhaust pipe is provided with a cooling jacket.

[0017] In one possible implementation, the fixed plate is provided with a cooler, which is connected to the cooling jacket.

[0018] In one possible implementation, the pressure balancing mechanism further includes two reinforcing ribs; the two reinforcing ribs are respectively disposed on the two fixed plates, with one end connected to the fixed plate and the other end connected to the balancing shell.

[0019] The beneficial effects of the liquid storage tank pressure balancing device provided by this utility model are as follows: Compared with the prior art, in use, the liquid storage port of the tanker truck is connected to the liquid inlet of the liquid storage tank, and the first vent pipe of the balancing pipeline mechanism is connected to the gas phase port of the tanker truck. When the tanker truck fills the liquid storage tank with raw materials, the gas in the liquid storage tank enters the inlet pipe through the inlet, and then enters the pressure bladder through the inlet pipe, causing the pressure bladder to expand. After the pressure bladder expands to a certain extent, the control mechanism opens the first vent pipe, allowing gas to enter the tanker truck, thereby creating a backflow and pressure replenishment working state between the tanker truck and the liquid storage tank, maintaining the pressure stability of the liquid storage tank and the tanker truck. After the raw materials are filled, the control mechanism closes the first vent pipe. When the internal pressure of the storage tank becomes too high due to changes in the external environment, the gas in the gas phase zone of the storage tank will enter the pressure bladder through the inlet pipe, causing the pressure bladder to expand further and thus reducing the internal pressure of the storage tank. When the internal pressure of the storage tank becomes too low due to changes in the external environment, the control mechanism opens the second inlet pipe, and the gas in the pressure bladder will enter the gas phase zone of the storage tank through the second inlet pipe, thereby increasing the internal pressure of the storage tank and ensuring the stability of the internal pressure. In this way, the inlet pipe and the first vent pipe enable the storage tank and the tank truck to form a backflow and pressure replenishment working state, which can ensure the pressure balance between the storage tank and the tank truck when the storage tank is filled with raw materials. At the same time, when the internal pressure of the storage tank becomes too high or too low due to the influence of the external environment, the pressure bladder absorbs or releases gas through the pressure bladder and the second inlet pipe, ensuring the stability of the internal pressure of the storage tank and thus better protecting the storage tank. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram showing the connection between the liquid storage tank and the pressure balancing device provided in an embodiment of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the pressure balancing device provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram showing the connection between the liquid storage tank and the pressure balancing device provided in an embodiment of the present invention. Figure 2 .

[0024] The following are the labeling elements in the figure:

[0025] 1. Divider plate; 11. Air inlet; 12. Air outlet; 2. Pressure balancing mechanism; 21. Balancing shell; 22. Pressure bladder; 23. Fixing plate; 24. Reinforcing rib; 3. Balancing pipeline mechanism; 31. Air inlet pipe; 32. First air outlet pipe; 33. Second air outlet pipe; 34. Sealing plate; 4. Control mechanism; 41. First control valve; 42. Second control valve; 43. First sensor; 44. Second sensor; 45. Pressure-resistant plate; 46. Elastic element; 5. Liquid storage tank; 51. Balancing chamber; 52. Liquid storage chamber; 6. Heating jacket; 7. Heater; 8. Cooling jacket; 9. Cooler. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] Please see Figures 1 to 3The pressure balancing device for a liquid storage tank provided by this utility model will now be described. A pressure balancing device for a liquid storage tank includes a partition plate 1, a pressure balancing mechanism 2, a balancing pipeline mechanism 3, and a control mechanism 4. The partition plate 1 is disposed inside the liquid storage tank 5, dividing the interior of the liquid storage tank 5 into a balancing chamber 51 and a storage chamber 52. The inlet and outlet of the liquid storage tank 5 are both located in the storage chamber 52. The partition plate 1 has an air inlet 11 and an air outlet 12, both located in the gas phase region of the storage chamber 52. The pressure balancing mechanism 2 is disposed in the balancing chamber 51. The pressure balancing mechanism 2 includes a balancing shell 21 and a pressure bladder 22. The balancing shell 21 is fixedly connected to the inner wall of the liquid storage tank 5. The pressure bladder 22 is disposed within the balancing shell. Inside 21; the balancing pipeline mechanism 3 is located inside the balancing chamber 51; the balancing pipeline mechanism 3 includes an air inlet pipe 31, a first air outlet pipe 32, and a second air outlet pipe 33; one end of the air inlet pipe 31 is connected to the air inlet 11, and the other end is connected to the pressure bladder 22; one end of the first air outlet pipe 32 is connected to the pressure bladder 22, and the other end passes through the tank body of the liquid storage tank 5 and is connected to the gas phase port of the tank truck; one end of the second air outlet pipe 33 is connected to the pressure bladder 22, and the other end is connected to the air outlet 12; the control mechanism 4 is located on the balancing pipeline mechanism 3 and is used to control the opening or closing of the air inlet pipe 31, the first air outlet pipe 32, and the second air outlet pipe 33.

[0031] Compared with the prior art, the liquid storage tank pressure balancing device provided in this embodiment connects the liquid storage port of the tanker truck to the liquid inlet of the liquid storage tank 5 during use, and the first vent pipe 32 of the balancing pipeline mechanism 3 is connected to the gas phase port of the tanker truck. When the tanker truck fills the liquid storage tank 5 with raw materials, the gas in the liquid storage tank 5 enters the vent pipe 31 through the vent 11, and then enters the pressure bladder 22 through the vent pipe 31, causing the pressure bladder 22 to inflate. After the pressure bladder 22 inflates to a certain extent, the control mechanism 4 opens the first vent pipe 32 to allow gas to enter the tanker truck, thereby creating a backflow and pressure replenishment working state between the tanker truck and the liquid storage tank 5, maintaining the pressure stability of the liquid storage tank 5 and the tanker truck. After the raw materials are filled, the control mechanism 4 closes the first vent pipe 32. When the internal pressure of the storage tank 5 becomes too high due to changes in the external environment, the gas in the gas phase zone of the storage tank 5 will enter the pressure bladder 22 through the inlet pipe 31, causing the pressure bladder 22 to expand further, thereby reducing the internal pressure of the storage tank 5. When the internal pressure of the storage tank 5 becomes too low due to changes in the external environment, the control mechanism 4 opens the second inlet pipe 31, and the gas in the pressure bladder 22 will enter the gas phase zone of the storage tank 5 through the second inlet pipe 33, thereby increasing the pressure of the storage tank. The internal pressure of the storage tank 5 is maintained to ensure its stability. In this way, the storage tank 5 and the tank truck are in a recirculation and pressure replenishment state through the air inlet pipe 31 and the first air outlet pipe 32. This ensures the pressure balance between the storage tank 5 and the tank truck when the storage tank 5 is filled with raw materials. At the same time, when the internal pressure of the storage tank 5 is too high or too low due to the influence of the external environment, the pressure bladder 22 absorbs or releases gas through the second air inlet pipe 31 to ensure the internal pressure of the storage tank 5 is stable, thereby better protecting the storage tank 5.

[0032] Please see Figure 1 and Figure 2 As a specific embodiment of the liquid storage tank pressure balancing device provided by this utility model, the control mechanism 4 includes a first control valve 41 and a second control valve 42. The first control valve 41 is located on the first vent pipe 32, and the second control valve 42 is located on the second vent pipe 33. The control valves can realize remote control and automated operation. Through the first control valve 41 and the second control valve 42, the opening and closing of the first vent pipe 32 and the second vent pipe 33 can be controlled very conveniently. At the same time, the control valves can regulate the flow rate to maintain the stable operation of the first vent pipe 32 and the second vent pipe 33, and prevent damage to the balancing pipeline mechanism 3 due to excessive or insufficient pressure. Both the first control valve 41 and the second control valve 42 are solenoid valves.

[0033] Please see Figure 1 and Figure 2As a specific embodiment of the liquid storage tank pressure balancing device provided by this utility model, the control mechanism 4 further includes a first sensor 43, a second sensor 44, and an anti-pressure component; the first sensor 43 and the second sensor 44 are both disposed inside the balancing housing 21, and the first sensor 43 and the second sensor 44 are arranged opposite to each other; the first sensor 43 is electrically connected to the first control valve 41; the second sensor 44 is electrically connected to the second control valve 42; the anti-pressure component is disposed between the pressure bladder 22 and the second sensor 44, and the anti-pressure component has a direction along the inner wall of the balancing housing 21 toward or away from the second sensor 44. The system provides four degrees of freedom of movement to prevent the second control valve 42 from opening the second vent pipe 33 when adding raw materials. A sealing plate 34 is provided on the first vent pipe to seal it. After the tanker truck is connected to the storage tank 5, under pressure, gas in the storage tank 5 enters the pressure bladder 22 through the inlet 11 and inlet pipe 31. The pressure bladder 22 expands and contacts the first sensor 43 and the pressure-resistant component. The first sensor 43 is compressed, converting the pressure into an electrical signal that is transmitted to the first control valve 41. The first control valve 41 opens the first vent pipe 32, creating a backflow pressure replenishment between the tanker truck and the storage tank 5. Simultaneously, the opening of the first vent pipe 32 stops the pressure bladder 22 from expanding, preventing the pressure-resistant component from contacting the second sensor 44, thus maintaining the closure of the second vent pipe 33. This prevents the second sensor 44 from being compressed and opening the second vent pipe 33 when adding raw materials, which would affect the backflow pressure replenishment between the tanker truck and the storage tank 5. After the raw materials are added, the first vent pipe 32 is completely sealed with the sealing plate 34. When the internal pressure of the storage tank 5 becomes too high due to external environmental influences, the gas in the gas phase zone of the storage tank 5 enters the pressure bladder 22 through the inlet pipe 31. The pressure bladder 22 further expands and pushes the anti-pressure component towards the second sensor 44. The second sensor 44 is compressed and transmits an electrical signal to the second control valve 42. The second control valve 42 opens the second vent pipe 33, and a backflow pressure is formed between the pressure bladder 22 and the storage tank 5, maintaining the internal pressure of the storage tank 5. When the internal pressure of the storage tank 5 becomes too low due to external environmental influences, the gas in the pressure bladder 22 enters the gas phase zone of the storage tank 5 through the inlet pipe 31, increasing the internal pressure of the storage tank 5 and maintaining its internal pressure stability. Both the first sensor 43 and the second sensor 44 are pressure sensors.

[0034] The sensor and the solenoid valve are connected through a control system, which is either a PLC or a microcontroller.

[0035] Please see Figure 2As a specific embodiment of the liquid storage tank pressure balancing device provided by this utility model, the pressure-resistant component includes a pressure-resistant plate 45 and multiple elastic elements 46; the pressure-resistant plate 45 is located between the pressure bladder 22 and the second sensor 44, and is slidably connected to the balancing housing 21; the multiple elastic elements 46 are respectively disposed on the upper and lower sides of the second sensor 44, and the two ends of the elastic elements 46 are respectively connected to the inner walls of the pressure-resistant plate 45 and the balancing housing 21; when the pressure bladder 22 further expands, it will squeeze the pressure-resistant plate 45 to move towards the second sensor 44, and at the same time compress the elastic elements 46, so that the pressure-resistant plate 45 squeezes the second sensor 44; when the pressure of the liquid storage tank 5 is stable, the pressure bladder 22 contracts, the elastic elements 46 reset by elastic force, and push the pressure-resistant plate 45 to reset, the second sensor 44 transmits an electrical signal to the second control valve 42, and the second control valve 42 closes the second air outlet pipe 33.

[0036] Please see Figure 3 As a specific embodiment of the pressure balancing device for the liquid storage tank provided by this utility model, the pressure balancing mechanism 2 also includes two fixing plates 23; the two fixing plates 23 are respectively disposed on opposite sides of the balancing shell 21, and one end of the fixing plate 23 is connected to the balancing shell 21, and the other end is connected to the inner wall of the tank; the balancing shell 21 is fixed in the balancing cavity 51 by means of the two fixing plates 23, so as to prevent the balancing shell 21 from moving randomly when the liquid storage tank 5 moves.

[0037] Please see Figure 2 As a specific embodiment of the liquid storage tank pressure balancing device provided by this utility model, a heating jacket 6 is provided on the air inlet pipe 31; when the internal pressure of the liquid storage tank 5 is too low, the gas in the pressure bladder 22 enters the liquid storage tank 5 through the air inlet pipe 31. At this time, the gas is heated by the heating jacket 6, and then the heated gas comes into contact with the gas in the liquid storage tank 5 and exchanges heat, causing the gas in the liquid storage tank 5 to heat up, thereby quickly stabilizing the internal pressure of the liquid storage tank 5.

[0038] Please see Figure 3 As a specific embodiment of the liquid storage tank pressure balancing device provided by this utility model, a heater 7 is provided on the fixed plate 23, and the heater 7 is connected to the heating jacket 6; the gas in the air inlet pipe 31 is heated by the heater 7, thereby ensuring the heating function of the heating jacket 6; the heater 7 is set on the fixed plate 23 to make the structure of the pressure balancing device more compact.

[0039] Please see Figure 2As a specific embodiment of the liquid storage tank pressure balancing device provided by this utility model, a cooling jacket 8 is provided on the second vent pipe 33. When the internal pressure of the liquid storage tank 5 is too high, the gas located in the gas phase zone of the liquid storage tank 5 will enter the pressure bladder 22 through the inlet pipe 31. The pressure bladder 22 will further expand, causing the anti-pressure component to squeeze the second sensor 44. Subsequently, the second sensor 44 controls the second control valve 42 to open the second vent pipe 33. When the gas in the pressure bladder 22 enters the liquid storage tank 5 through the second vent pipe 33, it will be cooled by the cooling jacket 8. The cooled gas will come into contact with the gas in the liquid storage tank 5 and exchange heat, thereby cooling down the gas in the liquid storage tank 5 and ultimately stabilizing the internal pressure of the liquid storage tank 5 quickly.

[0040] Please see Figure 3 As a specific embodiment of the liquid storage tank pressure balancing device provided by this utility model, a cooler 9 is provided on the fixed plate 23, and the cooler 9 is connected to the cooling jacket 8; the cooler 9 is used to ensure that the cooling jacket 8 can cool the gas in the second air inlet pipe 31; the cooler 9 is set on the fixed plate 23, so that the structure of the pressure balancing device is more compact.

[0041] Please see Figure 3 As a specific embodiment of the liquid storage tank pressure balancing device provided by this utility model, the pressure balancing mechanism 2 also includes two reinforcing ribs 24; the two reinforcing ribs 24 are respectively disposed on two fixed plates 23, and one end is connected to the fixed plate 23, and the other end is connected to the balancing shell 21; the reinforcing ribs 24 are used to enhance the support capacity and fixing effect of the fixed plate 23.

[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure balancing device for a liquid storage tank, characterized in that, include: A partition plate is disposed inside the liquid storage tank and divides the interior of the liquid storage tank into a balance chamber and a liquid storage chamber; the liquid inlet and liquid outlet of the liquid storage tank are both located in the liquid storage chamber; the partition plate has an air inlet and an air outlet, and the air inlet and the air outlet are both located in the gas phase region of the liquid storage chamber; A pressure balancing mechanism is provided in the balancing chamber; the pressure balancing mechanism includes a balancing shell and a pressure bladder; the balancing shell is fixedly connected to the inner wall of the liquid storage tank; the pressure bladder is located inside the balancing shell; A balancing pipeline mechanism is disposed within the balancing chamber; the balancing pipeline mechanism includes an air inlet pipe, a first air outlet pipe, and a second air outlet pipe; one end of the air inlet pipe is connected to the air inlet, and the other end is connected to the pressure bladder; one end of the first air outlet pipe is connected to the pressure bladder, and the other end passes through the tank body of the storage tank and connects to the gas phase port of the tank truck; one end of the second air outlet pipe is connected to the pressure bladder, and the other end is connected to the air outlet; A control mechanism, located on the balance pipeline mechanism, is used to control the opening or closing of the air inlet pipe, the first air outlet pipe, and the second air outlet pipe.

2. The pressure balancing device for a liquid storage tank as described in claim 1, characterized in that, The control mechanism includes a first control valve and a second control valve; the first control valve is located on the first air outlet pipe; the second control valve is located on the second air outlet pipe.

3. The pressure balancing device for a liquid storage tank as described in claim 2, characterized in that, The control mechanism further includes a first sensor, a second sensor, and a pressure-resistant component; the first sensor and the second sensor are both located inside the balance housing and are arranged opposite to each other; the first sensor is electrically connected to the first control valve; the second sensor is electrically connected to the second control valve; the pressure-resistant component is located between the pressure bladder and the second sensor, and the pressure-resistant component has the freedom to move along the inner wall of the balance housing toward or away from the second sensor, so as to prevent the second control valve from controlling the second air outlet pipe to open when raw materials are added; a sealing plate is provided on the first air outlet pipe for sealing the first air outlet pipe.

4. The pressure balancing device for a liquid storage tank as described in claim 3, characterized in that, The pressure-resistant assembly includes a pressure-resistant plate and multiple elastic elements; the pressure-resistant plate is located between the pressure airbag and the second sensor, and is slidably connected to the balance shell; the multiple elastic elements are respectively disposed on the upper and lower sides of the second sensor, and the two ends of the elastic elements are respectively connected to the inner walls of the pressure-resistant plate and the balance shell.

5. The pressure balancing device for a liquid storage tank as described in claim 1, characterized in that, The pressure balancing mechanism also includes two fixing plates; the two fixing plates are respectively located on opposite sides of the balancing shell, and one end of the fixing plate is connected to the balancing shell, and the other end is connected to the inner wall of the tank.

6. The pressure balancing device for a liquid storage tank as described in claim 5, characterized in that, The air intake pipe is equipped with a heating jacket.

7. A pressure balancing device for a liquid storage tank as described in claim 6, characterized in that, A heater is provided on the fixed plate, and the heater is connected to the heating jacket.

8. The pressure balancing device for a liquid storage tank as described in claim 5, characterized in that, The second exhaust pipe is equipped with a cooling jacket.

9. A pressure balancing device for a liquid storage tank as described in claim 8, characterized in that, A cooler is provided on the fixed plate, and the cooler is connected to the cooling jacket.

10. A pressure balancing device for a liquid storage tank as described in claim 5, characterized in that, The pressure balancing mechanism also includes two reinforcing ribs; the two reinforcing ribs are respectively disposed on the two fixed plates, with one end connected to the fixed plate and the other end connected to the balancing shell.

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