A novel pump tower structure and its liquefied gas storage container

Abstract

The present invention relates to the technical field of liquefied gas storage, and discloses a novel pump tower structure and its liquefied gas storage container. A novel pump tower structure includes a bottom plate, and a fixing component is arranged on the bottom plate. The fixing component includes a pump tower base. In order to make the pump tower structure more stable, the novel pump tower structure and its liquefied gas storage container are provided with a fixing component to fixedly install the bottom end of the pump tower base on the bottom plate, and a liquid outlet pipe and three liquid inlet pipes are respectively installed with the cooperation of hoop clamps, and they are in an equilateral triangle shape, which improves the stability of the pump tower structure. The weight of the liquid outlet pipe is twice that of a single liquid inlet pipe, so that the weight distribution of each side of the equilateral triangle is the same, further improving the stability. At the same time, compared with the traditional pump tower structure, there is no obstruction at the bottom end of the liquid outlet pipe, and no pressure drop is formed inside, which is convenient for liquid discharge. At the same time, a staircase component is installed on the pump tower base, and the liquid outlet pipe does not bear the weight of the staircase component, which can improve the stability of the overall pump tower structure.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied gas storage, and particularly to a novel pump tower structure and its liquefied gas storage container. Background Art

[0002] In the technical field of liquefied gas storage equipment, a container for storing ultra-low temperature liquefied gas (such as liquefied natural gas LNG, storage temperature is about -160°C) and its supporting pump tower structure are used, mainly applied to the liquid phase conveying system of LNG storage tanks, which involves the structural design and stability optimization of the pump tower base, liquid outlet pipe, and liquid inlet pipe.

[0003] In the existing liquefied gas storage container, ultra-low temperature LNG is stored inside. The supporting pump tower base and the foundation at the bottom of the storage tank are strongly connected (such as bolt fixation), and its function is to limit the liquid outlet pipe to prevent the liquid outlet pipe from shaking horizontally and being damaged. A clearance fit is adopted between the liquid outlet pipe and the pump tower base because the liquid outlet pipe will contract upward due to thermal expansion and contraction in the ultra-low temperature environment. If strong fixation is adopted, it will cause structural stress concentration or deformation. In the existing design, the liquid outlet pipe is a single pipe, the number and layout of the liquid inlet pipes do not form a stable geometric structure, and the liquid inlet of the liquid outlet pipe is directly connected to the pump tower base. The structural design of the pump tower base forms an obstruction at the liquid inlet of the liquid outlet pipe, resulting in a blocked flow path when liquefied gas enters the liquid outlet pipe. In the existing technology, the maintenance staircase is directly installed on the liquid outlet pipe. The liquid outlet pipe not only undertakes the liquid phase conveying function but also bears the weight of the staircase, resulting in the liquid outlet pipe additionally bearing the structural load.

[0004] The existing pump tower base only limits the liquid outlet pipe through a clearance fit. Although it allows thermal expansion and contraction, the single liquid outlet pipe support structure has limited anti-shaking ability in the horizontal direction. Especially during the operation of the storage tank, the overall stability of the pump tower may be poor due to factors such as liquid flow vibration and environmental loads (such as wind force and earthquake). Moreover, the weight of the staircase is borne by the liquid outlet pipe, increasing the structural load of the liquid outlet pipe and further exacerbating the risk of its deformation, resulting in a decrease in the overall stability of the pump tower. Also, the structural design of the existing pump tower base forms an obstruction at the liquid inlet of the liquid outlet pipe. Liquefied gas needs to bypass the pump tower base to enter the liquid outlet pipe, resulting in a blocked flow path and forming a pressure drop in the liquid outlet pipe, increasing the pumping resistance and reducing the liquid phase conveying efficiency. The existing design does not optimize the weight distribution of the liquid inlet pipe, liquid outlet pipe, and pump tower base, and the center of gravity positions of each pipe do not form a stable geometric structure (such as an equilateral triangle), resulting in the deviation of the center of gravity of the overall structure and further affecting the stability.

[0005] In summary, the existing technology has deficiencies in the stability of the pump tower structure, fluid conveying efficiency, and load distribution, and it is urgent to improve the overall performance through structural improvement. In view of this, we propose a novel pump tower structure and its liquefied gas storage container. Summary of the Invention

[0006] The object of the present invention is to provide a novel pump tower structure and its liquefied gas storage container to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A novel pump tower structure includes a bottom plate, and a fixing component is arranged on the bottom plate. The fixing component includes:

[0009] A pump tower base, the pump tower base is fixedly installed on the top of the bottom plate. An outlet pipe and an inlet pipe are fixedly installed on the pump tower base in sequence through a hoop. A hoop is also arranged between the outlet pipe and the inlet pipe. There are three groups of inlet pipes, and the three groups of inlet pipes are linearly arrayed at equal intervals. A hoop is also arranged between the three groups of inlet pipes. The connecting lines formed by the centers, that is, the center-of-gravity positions, of the three groups of inlet pipes and the outlet pipe are equilateral triangles. The weight of the outlet pipe is twice that of a single group of inlet pipes. This weight distribution method can make the weight borne by each side of the equilateral triangle reach an equilibrium state;

[0010] A staircase member, and the staircase member is also fixedly installed on the pump tower base.

[0011] Preferably, there are two groups of hoops, and the two groups of hoops are respectively located at the upper and lower ends of the pump tower base, making the overall pump tower structure more firm.

[0012] Preferably, there are multiple groups of staircase members, and the multiple groups of staircase members are spirally linearly arrayed at equal intervals in the up-and-down direction of the pump tower base, so as to better carry out maintenance.

[0013] Preferably, the hoop and the staircase member do not intersect to prevent interference.

[0014] A liquefied gas storage container includes a novel pump tower structure, and also includes a tank wall. The tank wall is fixedly installed on the top of the bottom plate. A tank top is fixedly installed on the top of the tank wall. A secondary insulation block is fixedly installed inside the tank wall. A main insulation block is fixedly installed inside the secondary insulation block. An adiabatic ceiling is fixedly installed inside the top end of the main insulation block. There is a gap between the bottom ends of the outlet pipe and the inlet pipe and the inner bottom surface of the secondary insulation block. The top ends of the outlet pipe and the inlet pipe penetrate and are fixedly installed inside the tank top and the adiabatic ceiling. It also includes a maintenance component, and the maintenance component is arranged on the tank top.

[0015] Preferably, the maintenance component includes a maintenance cylinder. The maintenance cylinder is fixedly installed inside the tank top. The maintenance cylinder penetrates the adiabatic ceiling, and a bottom cover is hingedly installed at the bottom end of the maintenance cylinder.

[0016] Preferably, a threaded cover is threadedly installed at the top end of the maintenance cylinder, and a handle is fixedly installed at the center of the top of the threaded cover, which is convenient for rotating the threaded cover.

[0017] Preferably, an annular block is fixedly installed on the arc-shaped outer wall at the top of the inspection cylinder. The annular block is filled with antifreeze, and a conical cover is fixedly installed on the top of the annular block.

[0018] Preferably, a ladder is arranged inside the inspection cylinder to facilitate maintenance better.

[0019] Preferably, an auxiliary component is arranged on the threaded cover. The auxiliary component includes an auxiliary block. The auxiliary block is fixedly installed on the arc-shaped outer wall of the threaded cover. A fastener is arranged between the auxiliary block and the tank top. There are multiple groups of the auxiliary blocks and fasteners, and the multiple groups of the auxiliary blocks and fasteners are equally spaced in a circumferential array with the center of the circular cross-section of the threaded cover as the array center, so that the threaded cover is not easily loosened.

[0020] Compared with the prior art, the present invention provides a novel pump tower structure and its liquefied gas storage container, having the following beneficial effects:

[0021] 1. For the novel pump tower structure and its liquefied gas storage container, in order to make the pump tower structure more stable, by setting a fixing component, first, the bottom end of the pump tower base is fixedly installed on the bottom plate, and secondly, a liquid outlet pipe and three liquid inlet pipes are respectively installed with the cooperation of hoop, and they are in an equilateral triangle, so as to improve the stability of the pump tower structure. At the same time, the weight of the liquid outlet pipe is twice that of a single liquid inlet pipe, so that the weight distribution of each side of the equilateral triangle is the same, further improving the stability. At the same time, compared with the traditional pump tower structure, there is no occlusion at the bottom end of the liquid outlet pipe, so there is no pressure drop inside, which is convenient for liquid discharge. At the same time, a staircase component is installed on the pump tower base, and the liquid outlet pipe does not bear the weight of the staircase component, improving the stability, and then the stability of the overall pump tower structure can be improved.

[0022] 2. For the novel pump tower structure and its liquefied gas storage container, in order to better maintain the container body, by setting a maintenance component, when there is no liquefied gas inside the container body, rotate the handle, so that the threaded cover rotates, and then the maintenance personnel enter the inside of the inspection cylinder through the ladder, open the bottom cover, and then can transfer to the staircase component of the fixing component, so as to facilitate maintenance.

[0023] 3. For the novel pump tower structure and its liquefied gas storage container, in order to improve the sealing performance and practicability of the maintenance component, when finishing climbing out of the container body, after rotating the threaded cover, the bottom end of the threaded cover is immersed in the antifreeze inside the annular block, so that the sealing performance is better through liquid seal, and the conical cover can protect the antifreeze, and then the sealing performance and practicability of the maintenance component can be improved.

[0024] 4. For the new pump tower structure and its liquefied gas storage container, in order to make the maintenance component more stable, an auxiliary component is provided. When the threaded cover in the maintenance component is tightened to the target position, the hole positions on the auxiliary block are aligned with the preset hole positions on the tank top, and then the fasteners are screwed in, so that the threaded cover and the tank top are connected into a whole, and then the maintenance component is made more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a schematic cross-sectional view of a part of the structure of the present invention;

[0027] Figure 3 For the present invention Figure 2 is an enlarged schematic diagram of area A in the present invention;

[0028] Figure 4 is a schematic diagram of the fixing component structure of the present invention;

[0029] Figure 5 For the present invention Figure 4 is an enlarged schematic diagram of area B in the present invention;

[0030] Figure 6 is a schematic top view cross-sectional view of a part of the fixing component of the present invention;

[0031] Figure 7 is a schematic diagram of the overall structure of another perspective of the present invention;

[0032] Figure 8 For the present invention Figure 7 is an enlarged schematic diagram of area C in the present invention;

[0033] Figure 9 is a schematic cross-sectional view of a part of the tank top and the insulation ceiling of the present invention;

[0034] Figure 10 is an exploded cross-sectional view of a part of the structure of the present invention.

[0035] In the figure: 1, bottom plate; 2, tank wall; 3, tank top; 4, secondary insulation block; 5, main insulation block; 6, insulation ceiling; 7, fixing component; 71, pump tower base; 72, hoop; 73, liquid outlet pipe; 74, liquid inlet pipe; 75, staircase component; 8, maintenance component; 81, maintenance cylinder; 82, bottom cover; 83, threaded cover; 84, handle; 85, ring block; 86, conical cover; 87, ladder; 9, auxiliary component; 91, auxiliary block; 92, fastener. DETAILED DESCRIPTION OF THE INVENTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] In the present application, the orientation or positional relationship indicated by the term "upper" is based on the orientation or positional relationship shown in the drawings. This is mainly for better describing the present application and its embodiments, and is not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. Also, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific situations.

[0038] Please refer to Figure 1 - Figure 10 , the present invention provides a technical solution:

[0039] A novel pump tower structure includes a bottom plate 1, and a fixing component 7 is arranged on the bottom plate 1.

[0040] In an embodiment of the present invention, the fixing component 7 includes a pump tower base 71. The pump tower base 71 is fixedly installed on the top of the bottom plate 1. At the beginning of construction, the bottom end of the pump tower base 71 is tightly and firmly fixed on the bottom plate 1 to ensure that the pump tower base 71 and the bottom plate 1 form a stable whole, effectively resisting various external forces. Subsequently, the construction workers start to install the hoop 72. The hoop 72 is made of a metal material with high toughness and high strength, which can closely fit the surface of the pipeline and provide reliable fastening force. The liquid outlet pipe 73 and the liquid inlet pipe 74 are sequentially fixedly installed on the pump tower base 71 through the hoop 72. In addition, two groups of hoops 72 are provided, and the two groups of hoops 72 are respectively located at the upper and lower ends of the pump tower base 71, making the overall pump tower structure more firm. A hoop 72 is also provided between the liquid outlet pipe 73 and the liquid inlet pipe 74. Three groups of liquid inlet pipes 74 are provided. The connecting lines formed by the centers, that is, the center of gravity positions, of the three groups of liquid inlet pipes 74 and the liquid outlet pipe 73 are equilateral triangles. The weight of the liquid outlet pipe 73 is twice that of a single group of liquid inlet pipes 74. The construction workers first surround the liquid outlet pipe 73 and the liquid inlet pipe 74 with the hoop 72, and then use the matching bolts and nuts for fastening. The liquid inlet pipes 74 are set to three, and the three groups of liquid inlet pipes 74 are linearly arrayed at equal intervals. A hoop 72 is also provided between the three groups of liquid inlet pipes 74 and is distributed in an equilateral triangle with the liquid outlet pipe 73. Since the weight of the liquid outlet pipe 73 is twice that of a single liquid inlet pipe 74, this weight distribution method can make the weight borne by each side of the equilateral triangle reach an equilibrium state. From the perspective of mechanical principles, this uniform weight distribution can make the forces borne by the pump tower structure in all directions more balanced, thereby effectively improving the overall stability of the pump tower structure. This stability can reduce the risk of the pump tower structure shaking, displacing or even being damaged due to uneven force. Compared with the traditional pump tower structure, the bottom end of the liquid outlet pipe 73 of the present application has no shielding objects. During the flow of liquefied gas, no pressure drop will be formed inside the liquid outlet pipe 73. According to the principle of fluid mechanics, the shielding objects inside the pipeline will increase the flow resistance of the fluid and then generate pressure drop, while the liquid outlet pipe 73 of the present invention avoids this problem, enabling the liquefied gas to flow out more smoothly and improving the liquid outlet efficiency.

[0041] In an embodiment of the present invention, a staircase member 75 is also fixedly installed on the pump tower base 71. In addition, multiple groups of staircase members 75 are provided, and the multiple groups of staircase members 75 are linearly arrayed in a spiral shape at equal intervals in the up and down directions of the pump tower base 71, so as to better carry out maintenance. In addition, the hoop 72 and the staircase member 75 do not intersect to prevent interference. Further, the staircase member 75 is installed on the pump tower base 71, and the staircase member 75 is firmly fixed to the pump tower base 71 by means of welding or high-strength bolt connection, etc. Since the weight of the staircase member 75 is not borne by the liquid outlet pipe 73, the liquid outlet pipe 73 does not need to bear the additional load brought by the staircase member 75, which further ensures the stability of the pump tower structure and also avoids potential safety hazards such as pipeline rupture and leakage caused by abnormal force on the liquid outlet pipe 73.

[0042] A liquefied gas storage container includes a new type of pump tower structure, and also includes a tank wall 2. The tank wall 2 is fixedly installed on the top of the bottom plate 1, and the tank top 3 is fixedly installed on the top of the tank wall 2. A secondary insulation block 4 is fixedly installed inside the tank wall 2, and a main insulation block 5 is fixedly installed inside the secondary insulation block 4. An adiabatic ceiling 6 is fixedly installed inside the top end of the main insulation block 5. There is a gap between the bottom ends of the liquid outlet pipe 73 and the liquid inlet pipe 74 and the inner bottom surface of the secondary insulation block 4. The top ends of the liquid outlet pipe 73 and the liquid inlet pipe 74 penetrate and are fixedly installed inside the tank top 3 and the adiabatic ceiling 6. It should be noted that this liquefied gas storage container can be a land LNG tank or an LNG ship's cabin, and also includes a maintenance component 8, and the maintenance component 8 is arranged on the tank top 3.

[0043] In an embodiment of the present invention, the maintenance component 8 includes a maintenance cylinder 81. A ladder 87 is arranged inside the maintenance cylinder 81 for better maintenance. The maintenance cylinder 81 is fixedly installed inside the tank top 3 and penetrates through the thermal insulation ceiling 6. A bottom cover 82 is hingedly installed at the bottom end of the maintenance cylinder 81. Additionally, a threaded cover 83 is threadedly installed at the top end of the maintenance cylinder 81, and a handle 84 is fixedly installed at the center of the top of the threaded cover 83 for facilitating the rotation of the threaded cover 83. Moreover, a circular ring block 85 is fixedly installed on the arc-shaped outer wall at the top end of the maintenance cylinder 81, and antifreeze is filled inside the circular ring block 85. A conical cover 86 is fixedly installed at the top of the circular ring block 85. Further, when the liquefied gas inside the container body has been completely emptied and it is confirmed through strict safety inspections that maintenance operations can be carried out, the maintenance personnel start to operate. The maintenance personnel use tools to rotate the handle 84. The handle 84 and the threaded cover 83 are of an integral structure, thereby driving the threaded cover 83 to rotate synchronously. The threaded cover 83 is threadedly connected to the top end of the maintenance cylinder 81. As the threaded cover 83 rotates, it gradually separates from the maintenance cylinder 81. After opening the threaded cover 83, the maintenance personnel enter the maintenance cylinder 81 by means of the ladder 87 inside the maintenance cylinder 81. The maintenance personnel descend along the ladder 87. After reaching the bottom end of the maintenance cylinder 81, they find the hinge point of the bottom cover 82. The maintenance personnel open the bottom cover 82. At this time, a passage to the staircase member 75 of the fixing component 7 is opened up. The maintenance personnel transfer from the bottom cover 82 to the staircase member 75. Along the path of the staircase member 75, it is convenient to comprehensively maintain various parts of the container body, including checking whether the pipeline connections inside the container are loose, whether the tank body is corroded, etc. After the maintenance personnel complete the maintenance work of the container body and need to restore the sealing performance of the maintenance component 8, the maintenance personnel rotate the handle 84 in the reverse direction, driving the threaded cover 83 to rotate towards the top end of the maintenance cylinder 81. As the threaded cover 83 rotates, it gradually approaches the circular ring block 85 at the top end of the maintenance cylinder 81. When the threaded cover 83 rotates to a certain position, its bottom end just dips into the antifreeze pre-filled inside the circular ring block 85. The antifreeze has good sealing performance and can maintain a stable liquid state at normal temperature. After the bottom end of the threaded cover 83 is immersed in the antifreeze, a liquid seal effect is formed. In terms of the sealing principle, this liquid seal method can effectively prevent external air, dust and other impurities from entering the container body, and at the same time can also prevent the possible leakage of trace gases remaining inside the container to the external environment. At the same time, the conical cover 86 is made of corrosion-resistant and wear-resistant materials. Its top opening is tightly connected to the circular ring block 85, and the bottom is gradually expanded in a conical shape. The conical structure of the conical cover 86 can guide the possible falling water droplets, sundries, etc. along the conical surface to slide down, preventing them from directly falling into the antifreeze inside the circular ring block 85. In this way, it effectively avoids the interference of external factors on the antifreeze, ensures the stability and reliability of the liquid seal, and thus significantly improves the sealing performance and practicality of the maintenance component 8.

[0044] In an embodiment of the present invention, an auxiliary component 9 is provided on the threaded cap 83. The auxiliary component 9 includes an auxiliary block 91, and the auxiliary block 91 is fixedly installed on the arc-shaped outer wall of the threaded cap 83. A fastener 92 is provided between the auxiliary block 91 and the tank top 3. Additionally, there are five groups of the auxiliary block 91 and the fastener 92, and the five groups of the auxiliary block 91 and the fastener 92 are equally spaced in a circumferential array with the center of the circular cross-section of the threaded cap 83 as the array center, making the threaded cap 83 not easily loosen. Further, when the maintenance personnel tighten the threaded cap 83 in the maintenance component 8 to the target position, the hole positions on the auxiliary block 91 will align with the preset hole positions on the tank top 3. The auxiliary block 91 and the arc-shaped outer wall of the threaded cap 83 are firmly fixed by welding or other reliable connection methods to ensure that the auxiliary block 91 can move synchronously with it during the rotation of the threaded cap 83. After the hole positions are aligned, the maintenance personnel select a fastener 92 of an appropriate specification, such as a high-strength bolt, insert the fastener 92 into the hole positions on the auxiliary block 91 and the preset hole positions on the tank top 3, and then use a matching nut for tightening. During the tightening process, the tightening torque is also controlled by a torque wrench to make the fastener 92 generate sufficient fastening force to tightly connect the threaded cap 83 and the tank top 3 into a whole. Through this connection method, when the threaded cap 83 bears external forces such as vibration and pressure, these forces can be dispersed and transmitted to the tank top 3, thereby significantly enhancing the stability of the maintenance component 8. During actual use, problems such as decreased sealing performance and increased safety hazards caused by the loosening of the threaded cap 83 are effectively prevented, ensuring the safe and reliable operation of the entire liquefied gas storage container.

[0045] Working principle: At the beginning of construction, the bottom end of the pump tower base 71 is tightly and firmly fixed on the bottom plate 1 to ensure that the pump tower base 71 and the bottom plate 1 form a stable whole, effectively resisting various external forces. Subsequently, the construction personnel start to install the hoop 72. The hoop 72 is made of a metal material with high toughness and strength, and can closely fit the surface of the pipeline and provide reliable fastening force. The construction personnel first surround the liquid outlet pipe 73 and the liquid inlet pipe 74 with the hoop 72, and then use the matching bolts and nuts for fastening. The liquid inlet pipe 74 is set to three and arranged linearly at equal intervals, and is distributed in an equilateral triangle with the liquid outlet pipe 73, as Figure 6As shown, if the weight of a single liquid inlet pipe 74 is set to a, then the weight of the liquid outlet pipe 73 is 2a. Since the weight of the liquid outlet pipe 73 is twice that of a single liquid inlet pipe 74, this weight distribution method can achieve a balanced state of the weight borne by each side of the equilateral triangle, that is, the weight borne by each side of the equilateral triangle is 3a (a + a + a = 3a, a + 2a = 3a, a + 2a = 3a). From the perspective of mechanical principles, this uniform weight distribution can make the forces borne by the pump tower structure in all directions more balanced, thus effectively improving the overall stability of the pump tower structure. This stability can reduce the risk of the pump tower structure shaking, displacing or even being damaged due to uneven force; compared with the traditional pump tower structure, for the liquid outlet pipe 73 of the present application, there is no obstruction at its bottom end. During the flow of liquefied gas, no pressure drop will be formed inside the liquid outlet pipe 73. According to the principle of fluid mechanics, the obstruction inside the pipeline will increase the flow resistance of the fluid and thus generate a pressure drop, while the liquid outlet pipe 73 of the present invention avoids this problem, enabling the liquefied gas to flow out more smoothly and improving the liquid discharge efficiency.

[0046] Furthermore, a staircase member 75 is installed on the pump tower base 71. The staircase member 75 is firmly fixed to the pump tower base 71 by means of welding or connection with high-strength bolts. Since the weight of the staircase member 75 is not borne by the liquid outlet pipe 73, the liquid outlet pipe 73 does not need to bear the additional load brought by the staircase member 75, which further ensures the stability of the pump tower structure and also avoids potential safety hazards such as pipeline rupture and leakage caused by abnormal force on the liquid outlet pipe 73.

[0047] Further, when the liquefied gas inside the container body has been completely emptied and it is confirmed through strict safety inspections that maintenance operations can be carried out, the maintenance personnel start to operate. The maintenance personnel cooperate with tools to rotate the handle 84. The handle 84 and the threaded cap 83 are of an integrated structure, thereby driving the threaded cap 83 to rotate synchronously. The threaded cap 83 is threadedly connected to the top of the maintenance cylinder 81. As the threaded cap 83 rotates, it gradually separates from the maintenance cylinder 81. After opening the threaded cap 83, the maintenance personnel enter the maintenance cylinder 81 through the ladder 87 inside the maintenance cylinder 81. The maintenance personnel descend along the ladder 87. After reaching the bottom of the maintenance cylinder 81, they find the hinge point of the bottom cover 82. The maintenance personnel open the bottom cover 82. At this time, a passage to the staircase member 75 of the fixing assembly 7 is opened up. The maintenance personnel transfer from the bottom cover 82 to the staircase member 75. Along the path of the staircase member 75, it is convenient to comprehensively maintain various parts of the container body, including checking whether the pipeline connections inside the container are loose, whether the tank body is corroded, etc. After the maintenance personnel complete the maintenance work of the container body, they need to perform an operation to restore the sealing performance of the maintenance assembly 8. The maintenance personnel rotate the handle 84 in the reverse direction, driving the threaded cap 83 to rotate towards the top of the maintenance cylinder 81. As the threaded cap 83 rotates, it gradually approaches the annular block 85 at the top of the maintenance cylinder 81. When the threaded cap 83 rotates to a certain position, its bottom end just dips into the antifreeze pre-filled inside the annular block 85. The antifreeze has good sealing performance and can maintain a stable liquid state at normal temperature. After the bottom end of the threaded cap 83 is immersed in the antifreeze, a liquid seal effect is formed. In terms of the sealing principle, this liquid seal method can effectively prevent external air, dust and other impurities from entering the container body, and at the same time prevent the possible residual trace gas inside the container from leaking into the external environment. At the same time, the conical cover 86 is made of corrosion-resistant and wear-resistant materials. Its top opening is tightly connected to the annular block 85, and the bottom is tapered and gradually expands. The conical structure of the conical cover 86 can guide the possible falling water droplets, sundries, etc. from the outside to slide along the conical surface, preventing them from directly falling into the antifreeze inside the annular block 85. In this way, it effectively avoids the interference of external factors on the antifreeze, ensures the stability and reliability of the liquid seal, and thus significantly improves the sealing performance and practicality of the maintenance assembly 8.

[0048] Further, when the maintenance personnel tighten the threaded cap 83 in the maintenance component 8 to the target position, the hole positions on the auxiliary block 91 will align with the preset hole positions on the tank top 3. The auxiliary block 91 and the arc-shaped outer wall of the threaded cap 83 are firmly fixed by welding or other reliable connection methods to ensure that the auxiliary block 91 can move synchronously with it during the rotation of the threaded cap 83. After the hole positions are aligned, the maintenance personnel select a fastener 92 of appropriate specification, such as a high-strength bolt, insert the fastener 92 into the hole positions on the auxiliary block 91 and the preset hole positions on the tank top 3, and then use a matching nut for tightening operation. During the tightening process, the tightening torque is also controlled by a torque wrench to make the fastener 92 generate sufficient fastening force to tightly connect the threaded cap 83 and the tank top 3 into a whole. Through this connection method, when the threaded cap 83 bears external forces such as vibration and pressure, these forces can be dispersed and transmitted to the tank top 3, thus significantly enhancing the stability of the maintenance component 8. During actual use, problems such as a decrease in sealing performance and an increase in safety hazards caused by the loosening of the threaded cap 83 are effectively prevented, ensuring the safe and reliable operation of the entire liquefied gas storage container.

[0049] The above has generally described the present invention in detail, but based on the present invention, some modifications or improvements can be made, which are obvious to those of ordinary skill in the technical field. Therefore, modifications or improvements made without departing from the spirit and idea of the present invention are within the protection scope of the present invention.

Claims

1. A novel pump tower structure, characterized in that, It includes a bottom plate (1), and a fixing component (7) is arranged on the bottom plate (1). The fixing component (7) includes: A pump tower base (71). The pump tower base (71) is fixedly installed at the top of the bottom plate (1). An outlet pipe (73) and an inlet pipe (74) are successively fixedly installed on the pump tower base (71) through a hoop (72). A hoop (72) is also arranged between the outlet pipe (73) and the inlet pipe (74). There are three groups of inlet pipes (74). The three groups of inlet pipes (74) are linearly arrayed at equal intervals. A hoop (72) is also arranged between the three groups of inlet pipes (74). The connection lines formed by the centers, i.e., the centroid positions, of the three groups of inlet pipes (74) and the outlet pipe (73) are equilateral triangles. The weight of the outlet pipe (73) is twice that of a single group of inlet pipes (74). This weight distribution method can make the weight borne by each side of the equilateral triangle reach an equilibrium state. A staircase component (75). The staircase component (75) is also fixedly installed on the pump tower base (71).

2. The novel pump tower structure according to claim 1, wherein: There are two groups of hoops (72), and the two groups of hoops (72) are respectively located at the upper and lower ends of the pump tower base (71).

3. A novel pump tower structure according to claim 1, characterized in that: There are multiple groups of staircase components (75), and the multiple groups of staircase components (75) are spirally linearly arrayed at equal intervals in the up-and-down direction of the pump tower base (71).

4. A novel pump tower structure according to claim 1, characterized in that: The hoop (72) and the staircase component (75) do not intersect.

5. A liquefied gas storage container, characterized in that: It includes the novel pump tower structure according to any one of claims 1-4, and also includes a tank wall (2). The tank wall (2) is fixedly installed at the top of the bottom plate (1). A tank top (3) is fixedly installed at the top of the tank wall (2). A secondary insulation block (4) is fixedly installed inside the tank wall (2). A main insulation block (5) is fixedly installed inside the secondary insulation block (4). An adiabatic ceiling (6) is fixedly installed inside the top end of the main insulation block (5). There is a gap between the bottom ends of the outlet pipe (73) and the inlet pipe (74) and the inner bottom surface of the secondary insulation block (4). The top ends of the outlet pipe (73) and the inlet pipe (74) penetrate and are fixedly installed inside the tank top (3) and the adiabatic ceiling (6). It also includes a maintenance component (8), and the maintenance component (8) is arranged on the tank top (3).

6. The liquefied gas storage container according to claim 5, wherein: The maintenance component (8) includes a maintenance cylinder (81). The maintenance cylinder (81) is fixedly installed inside the tank top (3). The maintenance cylinder (81) penetrates the adiabatic ceiling (6). A bottom cover (82) is hingedly installed at the bottom end of the maintenance cylinder (81).

7. A liquefied gas storage container according to claim 6, characterized in that: A threaded cover (83) is threadedly installed at the top end of the maintenance cylinder (81). A handle (84) is fixedly installed at the center of the top of the threaded cover (83).

8. A liquefied gas storage container according to claim 7, characterized in that: An annular block (85) is fixedly installed on the arc-shaped outer wall at the top end of the maintenance cylinder (81). The annular block (85) is filled with antifreeze. A conical cover (86) is fixedly installed at the top of the annular block (85).

9. A liquefied gas storage container according to claim 8, characterized in that: A ladder (87) is arranged inside the maintenance cylinder (81).

10. A liquefied gas storage container according to claim 9, characterized in that: An auxiliary component (9) is provided on the threaded cap (83). The auxiliary component (9) includes an auxiliary block (91). The auxiliary block (91) is fixedly installed on the arc-shaped outer wall of the threaded cap (83). A fastener (92) is provided between the auxiliary block (91) and the tank top (3). Multiple groups of the auxiliary block (91) and the fastener (92) are provided, and the multiple groups of the auxiliary block (91) and the fastener (92) are equally spaced in a circumferential array with the center of the circular cross-section of the threaded cap (83) as the array center.

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