Efficient full compensation type elastic sealing device for storage tank and installation method

Abstract

The application relates to a high-efficiency full-compensation type elastic sealing device for a storage tank and a mounting method, which comprises a supporting frame, an upper sealing assembly and a lower sealing assembly, the supporting frame is fixed to the side edge of a floating plate, an outer ring plate is fixed on the supporting frame, and an inner ring plate is slidably sleeved in the outer ring plate; a lower sealing body of the lower sealing assembly is matched and sleeved in a lower sealing chamber, an upper sealing body of the upper sealing assembly is matched and sleeved in an upper sealing chamber, the inner parts of the upper sealing body and the lower sealing body are filled with gas, and the upper sealing body and the lower sealing body are connected with an upper gas pump and a lower gas pump respectively, and a plurality of groups of elastic elements are distributed along the circumference and are spaced apart between an upper top plate and a lower top plate. The intermittent peristaltic moving mode significantly reduces the abrasion of the sealing material caused by continuous friction, the sealing device can automatically adjust the sealing state along with the lifting of the floating plate, manual intervention is not needed, the sealing failure and the replacement frequency caused by the abrasion are effectively reduced, and the service life of the equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum storage tank sealing, in particular to a high-efficiency full-compensation elastic sealing device for a storage tank and a mounting method. BACKGROUND

[0002] In the petroleum, chemical and other industries, storage tanks are important equipment for storing liquid media. Among them, floating roof storage tanks can effectively reduce the evaporation loss of the medium and improve the safety and economy of the storage tank, and have been widely used. However, during the transportation of the storage tank, due to the drift of the floating plate, the deformation of the storage tank and the fluctuation of the medium liquid level and other factors, a large annular gap between the floating plate and the tank wall will be caused, which will in turn cause the risk of oil and gas leakage. This not only causes environmental pollution, but also may cause fire, explosion and other safety accidents.

[0003] Traditional sealing mainly includes mechanical sealing, bladder sealing and tongue-shaped sealing, etc. However, mechanical sealing only relies on mechanical force to press the sealing steel plate tightly against the tank wall, which not only causes large oil and gas loss, but also has poor adaptability to the tank wall, and has high requirements for the geometric shape of the tank wall, such as local concave-convex degree; compared with mechanical sealing, bladder sealing has better adaptability and better sealing effect, but it has the problems of poor wear resistance, easy damage, high requirement for tank wall smoothness and short service life; tongue-shaped sealing relies on the sliding contact between the elastic tongue and the tank wall to achieve sealing, which can overcome the disadvantage of easy damage of bladder sealing, but the sealing effect of this sealing method which only relies on the sliding contact between the elastic tongue and the tank wall is not ideal.

[0004] In addition, patent "CN111392253A" discloses a floating roof storage tank oil and gas space efficient full-compensation elastic sealing device, which utilizes the oil and gas sealing space formed by the elastic sealing plate and the rubber sealing diaphragm to eliminate the large area oil and gas space under the conventional sealing, greatly improving the sealing effect; patent "CN110002120A" discloses a storage tank full-compensation bladder high-elasticity sealing device, which realizes full-compensation sealing of the storage tank through the effect of mechanical elastic compensation combined with space sealing.

[0005] However, the above methods still have problems in sealing effect during the dynamic lifting of the floating plate. For example, as the oil is injected, the floating plate rises due to the buoyancy, and during this process, the sealing device needs to move synchronously to ensure the continuity of the sealing. However, the above sealing methods all have the problem of continuous contact between the sealing rubber body and the inner wall of the storage tank, i.e. the sealing rubber body is always in contact with the inner wall of the storage tank during the whole process of the floating plate rising and falling, which causes continuous friction and wear, thus affecting the sealing performance and service life of the sealing device, and also causing the movement of the floating plate to be hindered due to the increase of friction resistance, thereby affecting the overall operation efficiency and safety of the storage tank.

[0006] Therefore, it is necessary to study a high-efficiency full-compensation elastic sealing device for a storage tank and an installation method thereof. SUMMARY

[0007] In view of this, the present application aims to provide a high-efficiency full-compensation elastic sealing device for a storage tank and an installation method thereof, which is arranged in an annular space between an inner wall of the storage tank and a floating plate, effectively solving the problem of continuous contact wear in the dynamic sealing process of the existing sealing device.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a high-efficiency full-compensation elastic sealing device for a storage tank, comprising a support frame, an upper sealing assembly and a lower sealing assembly, the support frame is fixed to the side edge of the floating plate, and the side away from the floating plate is fixed with an outer ring plate, and the inner ring plate is slidably sleeved in the outer ring plate; the bottom of the outer ring plate and the top of the inner ring plate are respectively inclined and extended towards the storage tank, and the ends thereof are in close contact with the inner wall of the storage tank; the lower sealing assembly comprises a lower top plate and a lower sealing body, the lower top plate is vertically arranged above the outer ring plate, and a lower sealing chamber is formed between the lower top plate, the outer ring plate and the inner wall of the storage tank, the lower sealing body is matched and sleeved in the lower sealing chamber and is in close contact with the inner wall of the storage tank; the upper sealing assembly comprises an upper top plate, an upper sealing body, an upper capsule and an upper clamping block, the inner ring plate is provided with the upper clamping block, and the inner side of the upper clamping block is fixed with the upper capsule; one end of the upper top plate is in contact with the inner wall of the storage tank, and the other end is extended along the horizontal direction and is fixed with the upper clamping block in the inner ring plate, so that an upper sealing chamber is formed between the upper top plate, the inner ring plate and the inner wall of the storage tank, and the upper sealing body is matched and sleeved in the upper sealing chamber and is in close contact with the inner wall of the storage tank; a plurality of groups of elastic members are distributed along the circumference between the upper top plate and the lower top plate; and the inside of the upper sealing body and the lower sealing body is filled with gas and is connected with an upper gas pump and a lower gas pump respectively; the lower sealing body is communicated with the upper capsule through an air pipe; when the floating plate floats up and down, the controller controls the upper gas pump and the lower gas pump to adjust the amount of gas in the upper sealing body and the lower sealing body respectively, so that the two bodies are alternately expanded and contracted while floating up and down with the floating plate, thereby forming dynamic adjustment of the strong sealing and weak sealing states.

[0009] Further, the inner side of the support frame is fixedly connected with the floating plate through bolts, and the top is inwardly bent to form a support platform; the outer side wall of the support frame is fixedly connected with the outer ring plate through bolts, and the side adjacent to the support frame on the outer ring plate is provided with a supporting plate inward along the horizontal direction.

[0010] Further, the support frame further comprises a U-shaped pressing plate and a through bolt, the supporting plate is arranged above the support platform, and the U-shaped pressing plate is downwardly opened and pressed on the supporting plate; the through bolt sequentially penetrates the U-shaped pressing plate, the supporting plate and the support platform along the vertical direction, and the bottom is provided with a nut, so that the outer ring plate and the support frame are tightly fastened together.

[0011] Further, the lower sealing body top is fixed with the lower top plate, and a self-plastic inner elastic sheet opening downward is sleeved in the lower sealing body; the upper sealing body bottom is fixed with the upper top plate, and a self-plastic inner elastic sheet opening upward is sleeved in the upper sealing body.

[0012] Further, the outer surface of the upper sealing body and the lower sealing body can be further matched with a layer of rubber sealing diaphragm, and the rubber sealing diaphragm is butyronitrile or fluorine rubber.

[0013] Further, the elastic member includes a spring and a telescopic rod, the telescopic rod is vertically installed between the upper top plate and the lower top plate, the spring is sleeved outside the telescopic rod, and the upper top surface and the lower top surface of the spring are respectively pressed against the upper top plate and the lower top plate.

[0014] Further, the outer ring plate top end is further provided with a limiting stop.

[0015] Further, the lower sealing assembly further includes a lower clamping plate and a lower capsule, the inner ring plate lower portion of the outer ring plate is internally provided with a ring groove, the lower clamping plate is sleeved in the ring groove, the lower clamping plate is fixedly connected with the lower capsule on the side away from the lower top plate, the lower capsule is communicated with the upper sealing body, and the lower clamping plate is clamped and fixed with the lower top plate.

[0016] Further, the floating disc is fixed with an upper ring pipe and a lower ring pipe through a mounting buckle, the upper air pump is communicated with the upper ring pipe through a first air pipe, the upper ring pipe is uniformly provided with upper branch air pipes, each upper branch air pipe is communicated with the upper sealing body, and an upper air valve is mounted on the first air pipe; the lower air pump is communicated with the lower ring pipe through a second air pipe, the lower ring pipe is uniformly provided with lower branch air pipes, each lower branch air pipe is communicated with the lower sealing body, and a lower air valve is mounted on the second air pipe.

[0017] The application further provides a mounting method of the storage tank efficient full-compensation type elastic sealing device.

[0018] Step 1, place the support frame on the side of the floating disc and adjust the position to ensure that it is horizontal and stable, and fixedly connect the inner side of the support frame with the floating disc through bolts;

[0019] Step 2, vertically install the lower top plate above the outer ring plate, make the outer ring plate bottom closely contact with the tank wall to form a lower sealing chamber, and match the lower sealing body with the lower sealing chamber;

[0020] Step 3, vertically install the upper top plate with the inner ring plate, make the inner ring plate top closely contact with the tank wall to form an upper sealing chamber, match the upper sealing body with the upper sealing chamber, and fix the elastic member between the upper and lower top plates along the circumference;

[0021] Step 4, the outer ring plate is fixedly connected to the support frame through bolts, and the supporting plate, the U-shaped pressing plate and the penetrating bolt are installed, and the nuts are fastened, so that the outer ring plate is firmly combined with the support frame;

[0022] Step 5, the upper air pump is communicated with the upper ring pipe through the first air pipe, and the upper air valve is installed on the first air pipe, each upper branch air pipe is branched from the upper ring pipe and communicated with the upper sealing body respectively; the lower air pump is communicated with the lower ring pipe through the second air pipe, and the lower air valve is installed on the second air pipe, each lower branch air pipe is branched from the lower ring pipe and communicated with the lower sealing body respectively;

[0023] Step 6, the upper and lower air pumps are driven by the controller to inject gas into the upper and lower sealing bodies respectively, so that they are inflated, the side edges of the upper and lower sealing bodies are tightly attached to the tank wall, and the upper capsule body is connected with the lower sealing body through the lower branch air pipe, and the lower capsule body is connected with the upper sealing body through the upper branch air pipe.

[0024] The beneficial effects of the above technical scheme are: the sealing device provided by the application ingeniously solves the problem of continuous friction and wear of the sealing device between the tank and the floating disc in the process of frequent lifting, and has the following characteristics: first, it can realize self-adaptive adjustment during the lifting of the floating disc, reduce the direct contact between the sealing rubber body and the inner wall of the tank, and reduce the wear; second, it should have excellent elastic compensation ability to cope with the displacement of the floating disc caused by the change of liquid level, and ensure that the sealing effect is not affected; third, the structure design should be reasonable, convenient for installation and maintenance, and applicable to various types of floating roof tanks.

[0025] The application utilizes the corresponding control of the upper and lower air pumps, the alternating expansion and contraction of the upper and lower sealing bodies, to form dynamic adjustment of strong and weak sealing states. This air pressure regulation mechanism can quickly respond to the change of the position of the floating disc, so that it is always in close contact with the inner wall of the tank during the upward and downward movement of the floating disc, realizes efficient sealing, and effectively prevents medium evaporation and leakage.

[0026] In the application, the multiple sets of elastic members distributed along the circumference between the upper top plate and the lower top plate provide additional support and buffer to the upper sealing assembly and the lower sealing assembly through intermittent energy storage and release, so that the sealing device can maintain stable sealing effect when subjected to external force. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of an embodiment of the application;

[0028] Figure 2 It is a sectional view of the support frame;

[0029] Figure 3 It is a schematic diagram of the internal structure of the upper and lower sealing bodies;

[0030] Figure 4 is a sectional view of the inner ring plate;

[0031] Figure 5 is a schematic view of the gas path connection of the upper and lower sealing assemblies;

[0032] Figure 6 is a schematic view of the gas path connection mechanism of the lower ring pipe;

[0033] Figure 7 is a schematic view of another gas path connection structure of the upper and lower capsules;

[0034] Figure 8 is a schematic view of another embodiment of the present application.

[0035] Reference signs: 1 - tank wall, 2 - floating disc, 3 - support frame, 31 - support platform, 32 - nut, 33 - bolt, 34 - pressing plate, 4 - outer ring plate, 40 - stop table, 41 - supporting plate, 42 - lower top plate, 43 - lower sealing body, 44 - lower ring pipe, 441 - fixing seat, 45 - lower air valve, 46 - second air pipe, 47 - lower sealing chamber, 48 - lower branch air pipe, 49 - lower branch pipe, 5 - inner ring plate, 51 - upper top plate, 52 - upper sealing body, 521 - limiting groove, 522 - upper clamping block, 523 - limiting spring, 524 - upper capsule, 525 - air inlet, 6 - elastic member, 61 - spring, 62 - telescopic rod, 7 - lower air pump, 8 - upper air pump, 9 - auxiliary air pump, 91 - auxiliary pipe, 92 - auxiliary pressure valve, 10 - clamping groove, 101 - pressure capsule, 102 - pressure clamping tooth, 103 - fixed capsule. DETAILED DESCRIPTION

[0036] The present application will be further described in detail below in conjunction with the drawings and specific embodiments:

[0037] Embodiment 1 aims to provide a high-efficiency full-compensation elastic sealing device for storage tanks, mainly used for sealing in the annular space between the tank wall and the floating disc. With the rapid development of the petroleum and chemical industry, large floating roof storage tanks are the main storage equipment for liquid materials such as crude oil and refined oil, and their sealing performance is directly related to storage safety, environmental protection, and energy consumption control. Commonly used sealing devices include elastic sealing and capsule sealing, and the setting of the sealing device can effectively shield the evaporation of the gas phase in the annular space and reduce the loss of stored materials. In view of the problem that the sealing structure in the prior art is prone to wear and tear and cannot dynamically adjust the sealing tension, the present embodiment provides a high-efficiency full-compensation elastic sealing device for storage tanks, which can reduce the direct and continuous contact between the sealing rubber body and the inner wall of the storage tank during the dynamic lifting of the floating disc, thereby effectively reducing wear and tear, improving sealing effect, and ensuring long-term stable operation of the storage tank.

[0038] As Figures 1-5As shown, the storage tank high-efficiency full compensation type elastic sealing device provided by the embodiment comprises a support frame 3, an upper sealing assembly and a lower sealing assembly, wherein the inner side of the support frame is fixedly connected with the side edge of the floating disc through bolts, the support frame extends upward along the vertical direction, the top is bent inward horizontally to form a support platform 31, a U-shaped pressing plate 34 is arranged on the support platform, and a through bolt 33 is screwed in the pressing plate. The outer side wall of the support frame is fixed with an outer ring plate 4 through bolts.

[0039] As shown in Figure 1 and 2 , the side of the outer ring plate close to the support frame is provided with a supporting plate 41 in the horizontal direction, the supporting plate is arranged above the support platform 31, the opening of the U-shaped supporting plate is downwardly pressed on the supporting plate, the through bolt 33 on the pressing plate passes through the U-shaped pressing plate, the supporting plate and the support platform in sequence along the vertical direction, and the bottom is provided with a nut, and in addition, a rubber gasket is arranged between the bolt and the pressing plate, so that the outer ring plate and the support frame are tightly sealed and fixed together.

[0040] As shown in Figure 4 , the inner ring plate 5 is also slidably sleeved in the outer ring plate, and a limiting stop table 40 is further arranged at the end of the outer ring plate, so as to avoid the upward sliding of the inner ring plate out of the outer ring plate. And the bottom of the outer ring plate and the top of the inner ring plate respectively extend to the direction close to the storage tank, and the ends thereof are provided with lip-shaped outer folded edges, and are tightly contacted with the tank wall 1 respectively, so that a primary sealing cavity is formed between the inner ring plate, the outer ring plate and the tank wall. Through the cooperation of the upper sealing assembly and the lower sealing assembly, the whole sealing device can be automatically adjusted with the change of the liquid level in the storage tank, so that the inner ring plate and the outer ring plate are always in close contact with the inner wall of the storage tank, realizing the sealing compensation effect in the whole range and the whole process, and effectively avoiding the sealing failure problem caused by the fluctuation of liquid level.

[0041] As shown in Figure 1 , Figure 4 and Figure 5 , the upper sealing assembly comprises an upper top plate 51, an upper sealing body 52, an upper clamping block 522, an upper capsule 524, an upper branch pipe 53, an upper branch air pipe 54 and an upper ring pipe 58, etc., wherein one end of the upper top plate 51 is in contact with the inner wall of the storage tank, and the other end extends in the horizontal direction and is fixedly connected with the upper clamping block in the inner ring plate. Specifically, a limiting groove 521 is arranged close to the middle position of the inner ring plate, an upper capsule 524 is sleeved in the limiting groove along the annular extension direction of the inner ring plate, one side of the upper capsule is fixed in the deep part of the limiting groove, the other side is fixed with a limiting spring 523, and the end of the limiting spring is fixed with the upper clamping block 522. The upper clamping block is in U-shaped structure and its opening faces the upper top plate direction, and is fixedly connected with the upper top plate.

[0042] In the natural state, when the upper capsule is inflated through the air inlet 525 on the upper capsule, the upper capsule will expand and press upward to the top plate. In this process, the limiting spring 523 is compressed, and the upper clamp block 522 and the upper top plate connected thereto are driven to move horizontally to the tank wall. When the upper capsule is filled with gas and reaches the preset pressure, the upward pressure generated by the expansion of the upper capsule tightly presses the upper top plate on the tank wall, so that the position of the inner ring plate does not change during the up-down movement of the sealing body under the driving of the outer ring plate.

[0043] At the same time, when the upper top plate contacts the tank wall, the upper top plate, the inner ring plate and the tank wall form an upper sealing chamber 55, and the upper sealing body 52 is matched and fitted in the upper sealing chamber. As shown in Figure 3 , the bottom of the upper sealing body 52 is fixed with the upper top plate, and a self-plastic inner spring is further fitted in the upper sealing body. The opening of the self-plastic inner spring faces upward, and the bottom is attached and fixed with the upper sealing body. Under the action of the self-plastic inner spring, the side edge of the inflated upper sealing body is tightly pressed against the inner wall of the tank.

[0044] As shown in Figure 1 , Figure 5 , and Figure 6 , the upper ring pipe 58 is further provided on the top surface of the floating plate through the fixing seat. The upper ring pipe is communicated with the upper air pump 8 through the first air pipe 56. The upper ring pipe is uniformly divided into a plurality of upper branch air pipes 54. Each upper branch air pipe is communicated with the upper sealing body, and the lower capsule is communicated with the upper branch air pipe 54 through the lower branch pipe 53, for discharging and adjusting the gas in the lower capsule. The upper air valve 57 is further connected on the first air pipe. The suction and discharge states of the upper air pump are controlled by the controller, so as to realize the contraction and expansion adjustment of the upper sealing body, and then realize the adjustment of different pressing degrees between the upper sealing body and the tank wall, so as to facilitate the guarantee of different sealing strengths in the annular space during the lifting of the floating plate, effectively reduce the friction between the upper sealing body and the tank wall, and reduce the wear.

[0045] As shown in Figure 1 , and Figure 5 , the lower sealing assembly is similar to the upper sealing assembly, and includes a lower top plate 42, a lower sealing body 43, a lower ring pipe 44, a lower air valve 45, a second air pipe 46, a lower branch air pipe 48 and a lower branch pipe 49, etc. The lower top plate 42 is vertically arranged above the outer ring plate and is clamped and fixed by the lower clamp plate. Specifically, as shown in Figure 4As shown, the inner ring plate below the outer ring plate is also provided with a limiting groove, and a lower clamping plate is sleeved in the limiting groove. The lower clamping plate is fixedly connected with a lower capsule body through a spring on the side away from the lower top plate. The other side of the lower clamping plate is fixedly clamped on the lower top plate. By injecting gas into the lower capsule body to make it inflate and expand, the lower clamping plate and the lower top plate are pushed by the spring to tightly abut against the tank wall, so that the position of the lower top plate is adjusted during the descent of the floating plate. When the inside of the lower capsule body is filled with gas and reaches a preset pressure, the upward pressure generated by the expansion tightly presses the lower top plate against the tank wall, so that the position of the outer ring plate does not change during the up-down movement of the upper sealing body driven by the inner ring plate.

[0046] At the same time, when the lower top plate contacts the tank wall, a lower sealing chamber 47 is formed between the lower top plate, the outer ring plate and the tank wall. The lower sealing body is matched and sleeved in the lower sealing chamber. Similarly, as shown in Figure 3 The lower sealing body 43 is fixed on the top of the lower top plate, and a self-plastic inner spring 421 is sleeved in the lower sealing body. The opening of the self-plastic inner spring faces downward, and the top is attached and fixed to the lower sealing body. Under the action of the self-plastic inner spring, the side edges of the inflated lower sealing body are tightly pressed against the inner wall of the tank.

[0047] As shown in Figure 1 and 5 The lower ring pipe 44 is also provided on the top surface of the floating plate through the fixing seat. The lower ring pipe is communicated with the lower air pump 7 through the second air pipe 46. The lower ring pipe is evenly divided into a plurality of lower branch air pipes 48. Each lower branch air pipe is communicated with the lower sealing body. The upper capsule body is communicated with the lower branch air pipe 48 through the lower branch pipe 49, and is used for adjusting the gas pressure in the upper capsule body. The lower air valve 45 is connected to the second air pipe. Valves are also installed on the lower branch air pipe 48 and the upper branch air pipe, respectively, for corresponding control of the gas passage. The suction and discharge states of the lower air pump are controlled by the controller, so as to realize the contraction and expansion adjustment of the lower sealing body, and then realize the adjustment of the different extrusion degrees between the lower sealing body and the tank wall, so as to facilitate the guarantee of different sealing strengths in the annular space during the lifting of the floating plate, effectively reduce the friction between the lower sealing body and the tank wall, and reduce the wear.

[0048] The outer surfaces of the upper sealing body and the lower sealing body in the embodiment can also be matched with a layer of rubber sealing diaphragm made of high-performance materials such as butyronitrile or fluorine rubber, which has excellent elasticity and sealing performance. The upper sealing body and the lower sealing body can be rubber capsule structures, which are filled with gas, so as to further improve the sealing effect, durability and corrosion resistance. Such a setting makes the tank sealing device also have full compensation capability, that is, it can adapt to the large change of the annular gap caused by the floating plate drift, tank deformation and the like. When the floating plate drifts due to medium fluctuation and other factors, the shape and position of the upper and lower sealing bodies can be automatically adjusted to ensure the close fit between the tank wall, so as to maintain stable sealing effect.

[0049] like Figure 4 As shown, multiple sets of elastic elements 6 are evenly arranged along the circumference within the gap between the upper and lower top plates. The elastic elements include springs 61 and telescopic rods 62. The telescopic rods are vertically installed between the upper and lower top plates, and springs are fitted over the telescopic rods. The telescopic rods serve as the support and guide structure for the springs. The upper and lower surfaces of the springs press against the upper and lower top plates respectively, and the top and bottom of the springs are fixed to the upper and lower ends of the telescopic rods respectively. When the floating roof rises due to oil injection, the lower top plate moves upwards accordingly, compressing the upper spring. Simultaneously, because the upper top plate is in close contact with the tank interior, the spring is compressed and stores energy. When the upper sealing body releases gas, reducing its internal pressure, the upper sealing body moves upwards a certain distance under the action of the spring. This elastic element, in conjunction with the upper and lower sealing components, allows the floating roof to adjust the gas volume in the upper and lower sealing bodies during its raising and lowering process using the controller's upper and lower air pumps. As the floating roof rises and falls, the upper and lower sealing bodies alternately expand and contract, adaptively adjusting the friction between them and the tank wall. This creates an alternating adjustment of strong and weak seals, ensuring a good sealing effect while effectively reducing wear between the upper and lower sealing bodies and the tank wall.

[0050] Working principle explanation: The high-efficiency fully compensated elastic sealing device for storage tanks provided in this embodiment, when in operation,

[0051] By injecting oil into the storage tank, the floating roof slowly floats upward with the oil, and the support frame simultaneously moves the outer ring plate and the lower sealing assembly upward. At the same time, the controller controls the lower air pump to draw air from the lower sealing body. A small amount of gas enters the upper bladder through the lower branch pipe, causing the upper bladder to expand and make the upper top plate come into close contact with the tank wall, thereby fixing the position of the inner ring plate.

[0052] and the outer ring plate and the lower top plate are moved upward, at this time the inner ring plate and the upper top plate are fixed, so that the spring is slowly compressed, with the continuous pumping of the lower air pump, the lower sealing body shrinks, at this time the friction between the lower sealing body and the tank wall is reduced, the lower sealing body and the tank wall form a weak sealing state, while the upper sealing body and the tank wall are still in a strong sealing state; when the lower sealing body shrinks to a certain extent (the upper part of the lower sealing body is always in contact with the tank wall under the action of the inner spring), the upper air pump is used to suck the gas from the upper sealing body, so that the pressure in the upper sealing body decreases and shrinks, and the lower air pump is used to inject gas into the lower sealing body, so that the pressure in the lower sealing body increases and expands, and the lower branch pipe 49 is used to suck the gas from the upper capsule, so that the upper top plate and the tank are separated, at this time the upper top plate, the inner ring plate and the upper sealing body inside move upward under the action of the spring, at this time the friction between the upper sealing body and the tank wall is reduced, and the upper sealing body and the tank wall form a weak sealing state, while the lower sealing body and the tank wall form a strong sealing state.

[0053] The above steps are repeatedly performed, the pressure in the upper sealing body, the lower sealing body, the upper capsule and the lower capsule is adjusted by the upper air pump and the lower air pump, the contraction and expansion of the sealing device are controlled, and the periodic contraction and expansion of the sealing device are realized, so that the sealing device moves upward in an intermittent peristaltic manner, so that the upper and lower sealing bodies and the tank wall form a strong sealing and weak sealing alternating state, and the wear of the rubber sealing body is effectively reduced while the floating plate slides up and down. When the floating plate descends, the modules are adjusted in reverse.

[0054] The embodiment mainly responds to the continuous friction and wear of the sealing device between the tank and the floating plate. The embodiment adjusts the sealing state dynamically to ensure the sealing effect of the tank at different liquid levels. The intermittent peristaltic movement significantly reduces the wear of the sealing material caused by continuous friction, and the sealing device can automatically adjust the sealing state with the lifting of the floating plate without manual intervention, effectively reducing the sealing failure and replacement frequency caused by wear, and prolonging the service life of the equipment.

[0055] Embodiment 2, based on embodiment 1, another gas connection mode of the upper capsule and the lower capsule is described in this embodiment.

[0056] In this embodiment, as Figure 7As shown, the upper capsule and the lower capsule are communicated through the auxiliary pipe 91, the output pipe of the auxiliary pipe is connected with the auxiliary air pump 9, and the auxiliary pressure valve 92 is also installed on the auxiliary pipe, the adjustment of the internal pressure of the upper capsule and the lower capsule is controlled by the auxiliary air pump 9 alone, and the unobstructedness of different gas paths is realized by the auxiliary pressure valve. That is, by the working of the auxiliary air pump 9, the gas can be injected into or extracted from the upper and lower capsules, so that the internal pressure thereof is changed, the auxiliary pressure valve 92 is installed on the auxiliary pipe 91 and is used for controlling the unobstructedness of different gas paths. By adjusting the opening degree or the opening and closing state of the auxiliary pressure valve, the flow direction and speed of the gas in the auxiliary pipe can be accurately controlled, the upper and lower capsules can be adaptively contracted and expanded according to different states of the strong sealing and the weak sealing, the contact state with the tank wall is changed, and the adjustment of the sealing effect is realized.

[0057] In the embodiment, the internal pressure of the upper capsule and the lower capsule can be independently controlled by the auxiliary pipe 91 and the auxiliary air pump 9, the flexibility of the gas path adjustment is improved, the independent air pressure adjustment system reduces the mutual interference between systems, the stability and reliability of the whole sealing device are improved, and the maintenance and repair are more convenient.

[0058] In the embodiment, the internal pressure of the upper capsule and the lower capsule can be independently controlled by the auxiliary pipe 91 and the auxiliary air pump 9, the flexibility of the gas path adjustment is improved, the stability and reliability of the whole sealing device are improved, and the maintenance and repair are more convenient.

[0059] In the embodiment, the internal pressure of the upper capsule and the lower capsule can be independently controlled by the auxiliary pipe 91 and the auxiliary air pump 9, the flexibility of the gas path adjustment is improved, the stability and reliability of the whole sealing device are improved, and the maintenance and repair are more convenient. Figure 8 As shown in the embodiment, the clamping groove 10 is opened in the outer ring plate along the annular extension direction thereof, the lower top plate 42 extends into the clamping groove, and the rubber type fixing capsule 103 is fixed at the end of the lower top plate, the fixing clamping tooth is arranged on the side of the fixing capsule 103 away from the lower top plate, the pressing capsule 101 is further arranged in the clamping groove 10, the inner side of the pressing capsule is fixed with the inner wall of the clamping groove, and the pressing clamping tooth 102 matched with the fixing clamping tooth on the fixing capsule 103 is arranged on the other side. When the gas is injected into the pressing capsule 101 through the gas pipe, the pressing capsule expands, the adjacent side fixing clamping tooth and the pressing clamping tooth 102 are matched and engaged, the fixing capsule 103 is continuously pressed inward with the continuous expansion of the pressing capsule, so that the lower top plate 42 is in close contact with the tank wall, and the position of the lower top plate is limited; when the internal pressure of the pressing capsule decreases, the pressing capsule shrinks, the engagement between the two is loose, the fixing capsule returns to the original state, and the lower top plate is reset.

[0060] The embodiment can flexibly control the expansion or contraction of the top pressing capsule by injecting or releasing gas into the top pressing capsule, so that the position of the lower top plate can be quickly and accurately adjusted. The non-mechanical adjustment method is simple to operate and has fast response speed. When maintenance or replacement of parts is required, the gas in the top pressing capsule can be released to loosen and reset the parts, so that the maintenance or replacement work can be conveniently performed.

[0061] In the above embodiments 1-3, the embodiment 4 provides a mounting method of the high-efficiency full-compensation elastic sealing device of the storage tank, comprising the following steps:

[0062] 1. Place the support frame on the side of the floating disc and adjust the position to ensure that it is horizontal and stable, and fix the inner side of the support frame to the floating disc with bolts. In the present application, a full-liquid stainless steel honeycomb floating disc is used, the main body of the floating disc is made of stainless steel, the honeycomb (honeycomb) box material is S30408, and the honeycomb (honeycomb) core material is 3003H18. Before the sealing device is installed, the floating disc needs to be detected and protected, and it is strictly prohibited to contact with carbon steel materials and avoid contact with strong acid or strong alkali substances. At the same time, the welding scars, burrs and other obstacles on the tank wall which may damage the sealing device are removed and polished smoothly to ensure that the floating disc seals normally and does not jam;

[0063] 2. Install the lower top plate vertically above the outer ring plate by bolts, so that the bottom of the outer ring plate is tightly attached to the tank wall to form a lower sealing chamber, and the lower sealing body is matched and installed in the lower sealing chamber. Ensure the sealing of the connection during installation;

[0064] 3. Install the upper top plate and the inner ring plate vertically, so that the top of the inner ring plate is tightly attached to the tank wall to form an upper sealing chamber, and the upper sealing body is matched and installed in the upper sealing chamber. The elastic member is fixed between the upper and lower top plates along the circumference;

[0065] 4. Fix the outer ring plate to the support frame by bolts, and install the supporting plate, U-shaped pressing plate and through bolts, and tighten the nuts to firmly combine the outer ring plate and the support frame;

[0066] 5. Connect the upper gas pump to the upper ring pipe through the first gas pipe, and install the upper gas valve on the first gas pipe. Each upper branch gas pipe is branched from the upper ring pipe and connected to the upper sealing body. Connect the lower gas pump to the lower ring pipe through the second gas pipe, and install the lower gas valve on the second gas pipe. Each lower branch gas pipe is branched from the lower ring pipe and connected to the lower sealing body. Connect the upper capsule to the lower sealing body through the lower branch pipe, and connect the lower capsule to the upper sealing body through the upper branch pipe. Install the valve on the gas path;

[0067] 6. The controller drives the upper and lower air pumps to inject gas into the upper and lower sealing bodies, causing them to expand and ensuring that the sides of the upper and lower sealing bodies are tightly attached to the tank wall. In the initial state, both the upper and lower sealing bodies are in an expanded state and are in close contact with the inner wall of the tank to form a strong seal.

[0068] 7. After all installation is completed, a water filling test shall be conducted. The water used for the water filling test should be clean fresh water with a pH value of 6.0 to 8.3 and a chloride content of less than 25 × 10⁻⁶ kg / L. The water temperature should not be lower than 5℃ and should not be higher than 50℃. The contact time between the internal floating roof and the water should not exceed 7 days and should not exceed 21 days at most. During the water filling test, the internal floating roof should be steadily raised from the lowest position to the highest design liquid level and then left to stand for 2 hours. When no abnormal phenomena occur during the entire process, the water can be drained to the lowest liquid level. During the draining process, the internal floating roof should descend steadily. During the water filling and raising test of the internal floating roof, the installation unit shall always have a dedicated person to monitor the process. If any problems are found, the water filling should be stopped immediately and repairs should be carried out. The water filling test can only continue after the repairs are completed.

[0069] Furthermore, during the water filling test, the steps in Example 1 above were used to perform preliminary debugging of the sealing device, check whether it could normally adjust the amount of gas in the upper and lower sealing bodies, observe whether the sealing device could move with the floating plate and maintain an effective seal, and conduct a comprehensive airtightness test to ensure that the entire sealing device was leak-free.

[0070] 8. After the water filling and lifting test is completed and the inspection is passed, immediately clean the accumulated water, mud and other dirt in the tank so that the storage tank can be put into use.

[0071] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. The basic concept of the present invention lies in achieving alternating strong and weak sealing by dynamically adjusting the state of the upper and lower sealing components, avoiding continuous sliding contact between the rubber sealing body and the inner wall of the storage tank, and ensuring efficient sealing between the inner wall of the storage tank and the floating roof at any liquid level, preventing the evaporation and leakage of the medium. Furthermore, the alternating movement of the upper and lower sealing bodies effectively reduces continuous friction between the rubber sealing body and the tank wall, achieving efficient and uninterrupted sealing of the annular space between the inner wall of the storage tank and the floating roof, while significantly reducing wear on the sealing material and extending the service life of the sealing device. Simultaneously, the connection of the air circuit system enables automated and intelligent control of the sealing process, improving the convenience and safety of operation. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A high efficiency full compensation elastic sealing device for a storage tank, characterized by: The application relates to a sealing device for a floating roof of a storage tank, which comprises a support frame, an upper sealing assembly and a lower sealing assembly. The upper sealing assembly comprises an upper top plate, an upper sealing body, an upper capsule and an upper clamping block, one end of the upper top plate is in contact with the inner wall of the storage tank, the other end of the upper top plate extends along the horizontal direction and is fixedly connected with the upper clamping block in the inner ring plate, a limiting groove is arranged at the position close to the middle part of the inner ring plate, the upper capsule is sleeved in the limiting groove along the annular extending direction of the inner ring plate, so that the upper top plate, the inner ring plate and the tank wall form an upper sealing chamber, the upper sealing body is matched and sleeved in the upper sealing chamber and is in close contact with the inner wall of the storage tank, a plurality of elastic members are distributed between the upper top plate and the lower top plate along the circumference, the upper sealing body and the lower sealing body are filled with gas and are connected with an upper air pump and a lower air pump respectively, and the lower sealing body is communicated with the upper capsule through an air pipe. When the floating roof floats up and down, the controller controls the upper air pump and the lower air pump to adjust the gas amount in the upper sealing body and the lower sealing body respectively, so that the upper sealing body and the lower sealing body are alternately expanded and contracted while floating up and down with the floating roof, thereby forming dynamic adjustment of the strong sealing and weak sealing states.

2. The high efficient full-compensated elastic sealing device for storage tank according to claim 1, characterized in that: The inner side of the support frame is fixedly connected with the floating roof through bolts, and the top part is inwardly bent to form a support platform. The outer side wall of the support frame is fixedly connected with the outer ring plate through bolts, and a supporting plate is arranged on the side of the outer ring plate adjacent to the support frame and inwardly extending along the horizontal direction.

3. The high efficiency, fully compensated, elastic sealing device for a storage tank of claim 2, wherein: The support frame further comprises a U-shaped pressing plate and a through bolt, the supporting plate is arranged above the support platform, the U-shaped pressing plate is downwardly opened and pressed on the supporting plate, and the through bolt sequentially penetrates the U-shaped pressing plate, the supporting plate and the support platform along the vertical direction, and the bottom part is provided with a nut, so that the outer ring plate and the support frame are tightly fixed together.

4. The high efficiency, fully compensated, elastic sealing device for storage tanks of claim 1, wherein: The top part of the lower sealing body is fixed with the lower top plate, and a self-plastic inner elastic sheet with a downward opening is sleeved in the lower sealing body; the bottom part of the upper sealing body is fixed with the upper top plate, and a self-plastic inner elastic sheet with an upward opening is sleeved in the upper sealing body.

5. The high efficiency, fully-compensated, elastic sealing device for a storage tank of claim 4, wherein: The outer surface of the upper sealing body and the lower sealing body can further be matched with a layer of rubber sealing diaphragm, and the rubber sealing diaphragm is butyronitrile or fluorine rubber.

6. The high efficiency, fully-compensated, elastic sealing device for a storage tank of claim 1, wherein: The elastic member comprises a spring and a telescopic rod, the telescopic rod is vertically installed between the upper top plate and the lower top plate, the spring is sleeved outside the telescopic rod, and the upper top surface and the lower top surface of the spring are respectively pressed between the upper top plate and the lower top plate.

7. The high efficiency, fully-compensated, elastic sealing device for storage tanks of claim 1, wherein: A limiting stop table is further arranged at the top port of the outer ring plate.

8. The high efficiency, fully-compensated, elastic sealing device for storage tanks of claim 1, wherein: The lower sealing assembly further comprises a lower clamping plate and a lower capsule, a ring groove is arranged in the inner part of the outer ring plate below the inner ring plate, the lower clamping plate is sleeved in the ring groove, the lower capsule is fixedly connected with the lower clamping plate at the side away from the lower top plate, the lower capsule is communicated with the upper sealing body, and the lower clamping plate is fixedly connected with the lower top plate.

9. The high efficiency, fully-compensated, elastic sealing device for storage tanks of claim 1, wherein: The upper ring pipe and the lower ring pipe are fixed on the floating disc through mounting buckles, the upper air pump is communicated with the upper ring pipe through a first air pipe, the upper ring pipe is uniformly provided with upper branch air pipes, each upper branch air pipe is communicated with an upper sealing body, and an upper air valve is mounted on the first air pipe; the lower air pump is communicated with the lower ring pipe through a second air pipe, the lower ring pipe is uniformly provided with lower branch air pipes, each lower branch air pipe is communicated with a lower sealing body, and a lower air valve is mounted on the second air pipe.

10. A method for installing a high-efficiency full-compensated elastic sealing device for a storage tank, using the high-efficiency full-compensated elastic sealing device for a storage tank according to any one of claims 1 to 8, characterized by: The method comprises the following steps: Step 1, place the support frame on the side of the floating disc and adjust the position to ensure that it is horizontal and stable, and fix the inner side of the support frame to the floating disc by using bolts; Step 2, vertically install the lower top plate above the outer ring plate, make the bottom of the outer ring plate closely contact with the tank wall to form a lower sealing chamber, and match the lower sealing body to be fitted in the lower sealing chamber; Step 3, vertically install the upper top plate and the inner ring plate, make the top of the inner ring plate closely contact with the tank wall to form an upper sealing chamber, match the upper sealing body to be fitted in the upper sealing chamber, and fix the elastic members along the circumference between the upper and lower top plates; Step 4, fix the outer ring plate to the support frame by using bolts, the support frame comprises a U-shaped pressing plate and a through bolt, one side of the outer ring plate adjacent to the support frame is provided with a supporting plate in the horizontal direction, the opening of the U-shaped pressing plate is downwardly pressed on the supporting plate; after the supporting plate, the U-shaped pressing plate and the through bolt are installed, the through bolt passes through the U-shaped pressing plate and the supporting plate in the vertical direction in sequence, and the fastening nut is used to make the outer ring plate and the support frame firmly combined; Step 5, connect the upper air pump to the upper ring pipe through the first air pipe, install the upper air valve on the first air pipe, each upper branch air pipe is branched from the upper ring pipe and communicated with the upper sealing body, connect the lower air pump to the lower ring pipe through the second air pipe, install the lower air valve on the second air pipe, and each lower branch air pipe is branched from the lower ring pipe and communicated with the lower sealing body; Step 6, drive the upper and lower air pumps by the controller to inject gas into the upper and lower sealing bodies to make them expand, and ensure that the side edges of the upper and lower sealing bodies closely contact with the tank wall; the inner part of the outer ring plate below the inner ring plate is provided with a ring groove, the lower clamping plate is fitted in the ring groove, the lower clamping plate is fixedly connected with the lower capsule body on the side away from the lower top plate, the upper capsule body is connected with the lower sealing body through the lower branch air pipe, and the lower capsule body is connected with the upper sealing body through the upper branch air pipe.

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