Efficient full-compensation type elastic sealing device for storage tank and mounting method of efficient full-compensation type elastic sealing device

Abstract

The invention relates to a storage tank efficient full-compensation type elastic sealing device and an installation method, the storage tank efficient full-compensation type elastic sealing device 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 disc, an outer ring plate is fixed to the supporting frame, and an inner ring plate is slidably sleeved with the outer ring plate; the lower sealing body of the lower sealing assembly is sleeved with the lower sealing cavity in a matched mode, the upper sealing body of the upper sealing assembly is sleeved with the upper sealing cavity in a matched mode, the upper sealing body and the lower sealing body are filled with gas and connected with the upper air pump and the lower air pump respectively, and a plurality of sets of elastic pieces are distributed between the upper top plate and the lower top plate at intervals along the circumference. According to the sealing device, abrasion caused by continuous friction of a sealing material is remarkably reduced in an intermittent peristaltic movement mode, the sealing state of the sealing device can be automatically adjusted along with lifting of the floating disc, manual intervention is not needed, sealing failure and replacement frequency caused by abrasion are effectively reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0002] The invention relates to the technical field of petroleum storage tank sealing, and in particular to a high-efficiency full-compensation elastic sealing device for a storage tank and an installation method thereof. Background Art

[0003] 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, so they have been widely used. However, during the transportation of the storage tank, due to factors such as the drift of the floating plate, the deformation of the storage tank and the fluctuation of the liquid level of the medium, a large annular gap will be generated between the floating plate and the tank wall, resulting in the risk of oil and gas leakage. This will not only cause environmental pollution, but may also cause safety accidents such as fire and explosion.

[0004] Traditional seals mainly include mechanical seals, bladder seals and tongue seals, etc. However, mechanical seals only rely on mechanical force to press the sealing steel plate against the tank wall, which not only causes a large oil and gas loss problem, but also has poor adaptability to the tank wall and has high requirements on the geometric shape of the tank wall, such as local unevenness. Compared with mechanical seals, bladder seals have stronger adaptability and better sealing effects, but they have poor wear resistance, are easy to break, have high requirements on the smoothness of the tank wall, and have a short service life. Tongue seals rely on the sliding contact between the elastic tongue and the tank wall to achieve a sealing effect. Although it can overcome the disadvantage of the easy breakage of bladder seals, the sealing effect that only relies on the sliding contact between the elastic tongue and the tank wall is not ideal.

[0005] In addition, the patent "CN111392253A" discloses a floating roof storage tank oil-free and gas-free space high-efficiency fully compensated elastic sealing device, which utilizes the oil-free and gas-free sealing space formed by the elastic sealing plate and the rubber sealing diaphragm to eliminate the large area of ​​oil and gas space at the bottom of the conventional seal, greatly improving the sealing effect; the patent "CN110002120A" discloses a storage tank full-compensation bladder-type high-elastic sealing device, which realizes full-compensation sealing of the storage tank through the combination of mechanical elastic compensation and space sealing.

[0006] However, the above methods still have problems in dealing with the sealing effect during the dynamic lifting and lowering of the floating plate. For example, as the oil is injected, the floating plate rises due to the buoyancy, and the sealing device needs to move synchronously during this process to ensure the continuity of the seal. However, the above sealing methods all have the problem of continuous contact between the sealing rubber body and the inner wall of the tank, that is, the sealing rubber body always keeps in contact with the inner wall of the tank during the entire process of the floating plate rising and falling, resulting in continuous friction and wear, which not only affects the sealing performance and service life of the sealing device, but also causes the movement of the floating plate to be hindered due to the increase in friction resistance, thereby affecting the overall operating efficiency and safety of the tank.

[0007] Based on this, it is necessary to study a high-efficiency fully compensated elastic sealing device and installation method for storage tanks. Summary of the invention

[0008] In view of this, the purpose of the present invention is to provide a high-efficiency fully compensated elastic sealing device for a storage tank and an installation method. The sealing device is arranged in the annular space between the inner wall of the storage tank and the floating plate, which effectively solves the problem of continuous contact wear in the dynamic sealing process of the existing sealing device.

[0009] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a high-efficiency fully compensated elastic sealing device for a storage tank, comprising a support frame, an upper sealing assembly and a lower sealing assembly, wherein the support frame is fixed to the side of the floating plate, and an outer ring plate is fixed on the side away from the floating plate, and an inner ring plate is slidably sleeved inside the outer ring plate; the bottom of the outer ring plate and the top of the inner ring plate are respectively inclined to extend in the direction close to the storage tank, and the ends thereof are tightly in 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 tightly in contact with the inner wall of the storage tank; the upper sealing assembly comprises an upper top plate, an upper sealing body, an upper bladder and an upper clamping plate, and an upper A card plate, an upper bladder body is fixed on the inner side of the upper card plate; one end of the upper top plate contacts the inner wall of the storage tank, and the other end extends in the horizontal direction and is clamped and fixed with the upper card plate in the inner ring plate, so that an upper sealed chamber is formed between the upper top plate, the inner ring plate and the tank wall, and the upper sealing body is matched and fitted in the upper sealed chamber and is in close contact with the inner wall of the storage tank; a plurality of groups of elastic members are distributed at intervals along the circumference between the upper top plate and the lower top plate; and the upper sealing body and the lower sealing body are filled with gas and are respectively connected to the upper air pump and the lower air pump; the lower sealing body is connected to the upper bladder body through an air pipe; when the floating plate floats up and down, the upper air pump and the lower air pump are controlled by a controller to adjust the gas volume in the upper sealing body and the lower sealing body respectively, so that the two can alternately expand and contract while floating up and down with the floating plate, thereby forming a dynamic adjustment of the strong sealing and weak sealing states.

[0010] Furthermore, the inner side of the support frame is fixedly connected to the floating plate by bolts, and the top is bent inward to form a support platform; the outer side wall of the support frame is fixedly connected to the outer ring plate by bolts, and a support plate is provided inwardly along the horizontal direction on one side of the outer ring plate adjacent to the support frame.

[0011] Furthermore, the support frame also includes a U-shaped pressure plate and a through bolt. The support plate is arranged above the support platform, and the opening of the U-shaped pressure plate presses downward on the support plate. The through bolt passes through the U-shaped pressure plate, the support plate and the support platform in sequence along the vertical direction, and a nut is assembled at the bottom, so that the outer ring plate and the support frame are fastened together.

[0012] Furthermore, the top of the lower sealing body is fixed to the lower top plate, and the lower sealing body is sleeved with a self-plastic inner elastic sheet with an opening facing downward; the bottom of the upper sealing body is fixed to the upper top plate, and the upper sealing body is sleeved with a self-plastic inner elastic sheet with an opening facing upward.

[0013] Furthermore, a layer of rubber sealing membrane can be matched and provided on the outer surfaces of the upper sealing body and the lower sealing body, and the rubber sealing membrane is nitrile or fluororubber.

[0014] Furthermore, 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 press between the upper and lower top plates respectively.

[0015] Furthermore, a limit stop is provided at the top port of the outer ring plate.

[0016] Furthermore, the lower sealing assembly also includes a lower clamping plate and a lower sac body; an annular groove is provided inside the outer ring plate below the inner ring plate, and the lower clamping plate is mounted in the annular groove; the lower clamping plate is fixedly connected to the lower sac body on the side away from the lower top plate, and the lower sac body is connected to the upper sealing body; the lower clamping plate is clamped and fixed to the lower top plate.

[0017] Furthermore, an upper ring tube and a lower ring tube are fixed on the floating plate by means of mounting buckles, the upper air pump is connected to the upper ring tube via a first air pipe, upper bronchial tubes are evenly arranged on the upper ring tube, each upper bronchial tube is respectively connected to the upper sealing body, and an upper air valve is installed on the first air pipe; the lower air pump is connected to the lower ring tube via a second air pipe, lower bronchial tubes are evenly arranged on the lower ring tube, each lower bronchial tube is respectively connected to the lower sealing body, and a lower air valve is installed on the second air pipe.

[0018] The present invention also provides a method for installing a high-efficiency full-compensation elastic sealing device for a storage tank, comprising the following steps: Step 1: Place the support frame on the side of the floating plate and adjust the position to ensure that it is level and stable. Use bolts to fix the inner side of the support frame to the floating plate. Step 2: vertically install the lower top plate above the outer ring plate so that the bottom of the outer ring plate is in close contact with the tank wall to form a lower sealed chamber, and fit the lower sealing body into the lower sealed chamber; Step 3, vertically install the upper top plate and the inner ring plate, so that the top of the inner ring plate is in close contact with the tank wall to form an upper sealed chamber, and fit the upper sealing body into the upper sealed chamber; and evenly distribute the elastic parts along the circumference and fix them between the upper and lower top plates; Step 4: Fix the outer ring plate to the support frame with bolts, install the support plate, U-shaped pressure plate and through bolts, and tighten the nuts to firmly combine the outer ring plate with the support frame; Step 5, connecting the upper air pump to the upper ring tube through the first air pipe, and installing an upper air valve on the first air pipe, so that each upper bronchial tube is separated from the upper ring tube and connected to the upper sealing body respectively; connecting the lower air pump to the lower ring tube through the second air pipe, and installing a lower air valve on the second air pipe, so that each lower bronchial tube is separated from the lower ring tube and connected to the lower sealing body respectively; Step 6: Use the controller to drive the upper and lower air pumps to inject gas into the upper and lower sealing bodies to expand them, ensuring that the sides of the upper and lower sealing bodies are in close contact with the tank wall; and connect the upper bladder body to the lower sealing body through the lower bronchus, and connect the lower bladder body to the upper sealing body through the upper bronchus.

[0019] The beneficial effects of the above technical solution are as follows: the sealing device provided by the present invention cleverly solves the problem of continuous friction and wear faced by the sealing device between the storage tank and the floating plate during frequent lifting and lowering, and has the following characteristics: First, it can realize adaptive adjustment during the lifting and lowering of the floating plate, reduce the direct contact between the sealing rubber body and the inner wall of the storage tank, thereby reducing wear; second, it should have excellent elastic compensation ability to cope with the displacement of the floating plate caused by the change of liquid level, to ensure that the sealing effect is not affected; third, the structural design needs to be reasonable, easy to install and maintain, and can be applicable to various types of floating roof storage tanks.

[0020] The present invention utilizes the gas path connection structure controlled by the upper and lower air pumps, and the upper sealing body and the lower sealing body alternately expand and contract, thereby forming a dynamic adjustment of the strong sealing and weak sealing states. This air pressure adjustment mechanism can quickly respond to the change of the floating plate position, so that the floating plate is always in close contact with the inner wall of the storage tank during the process of moving up and down, achieving efficient sealing and effectively preventing the volatilization and leakage of the medium.

[0021] In the present invention, multiple groups of elastic members are distributed along the circumference between the upper top plate and the lower top plate at intervals, which provide additional support and buffering effects to the upper sealing assembly and the lower sealing assembly through intermittent energy storage and release, so that the sealing device can maintain a stable sealing effect when subjected to external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of an implementation mechanism of the present invention; Figure 2 is a schematic diagram of a cross-sectional structure of a support frame; Figure 3 Schematic diagram of the internal structure of the upper sealing body and the lower sealing body; Figure 4 is a schematic diagram of the cross-sectional structure of the inner ring plate; Figure 5 It is a schematic diagram of the gas path connection of the upper sealing component and the lower sealing component; Figure 6 It is a schematic diagram of the gas path connection mechanism of the lower ring pipe; Figure 7It is a schematic diagram of another gas path connection structure of the upper bladder body and the lower bladder body; Figure 8 It is another schematic diagram of the structure of implementation of the present invention.

[0023] Figure numerals: 1-tank wall, 2-floating plate, 3-support frame, 31-support platform, 32-nut, 33-bolt, 34-pressing plate, 4-outer ring plate, 40-blocking platform, 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 bronchial pipe, 49-lower branch pipe, 5-inner ring plate, 51-upper top plate, 52-upper sealing body, 521-limiting groove, 522-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-top pressure capsule, 102-top pressure clamping tooth, 103-fixing capsule. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Example 1. This example aims to provide a highly efficient and fully compensated elastic sealing device for a storage tank, which is mainly used for sealing in the annular space between the tank wall and the floating plate. With the rapid development of the petrochemical industry, large floating roof storage tanks are the main storage equipment for liquid materials such as crude oil and refined oil. Their sealing performance is directly related to storage safety, environmental protection and energy consumption control. Commonly used sealing devices include elastic seals, bladder seals, etc. 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 easy to wear and the sealing tension cannot be dynamically adjusted, this example provides a highly efficient and fully compensated elastic sealing device for a storage tank, 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 plate, thereby effectively reducing wear, improving the sealing effect, and ensuring the long-term stable operation of the storage tank.

[0025] like Figure 1-5 As shown, the high-efficiency fully compensated elastic sealing device for a storage tank provided in this 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 to the side of the floating plate by bolts, the support frame extends vertically upward, and the top is horizontally bent inward to form a support platform 31, on which a U-shaped pressing plate 34 is provided, and through bolts 33 are screwed into the pressing plate. An outer ring plate 4 is fixed to the outer wall of the support frame by bolts.

[0026] like Figure 1 and 2As shown, a support plate 41 is provided inwardly along the horizontal direction on one side of the outer ring plate close to the support frame, and the support plate is arranged above the support platform 31, wherein the U-shaped support plate opening is pressed downward on the support plate, and the through bolt 33 on the pressure plate vertically passes through the U-shaped pressure plate, the support plate and the support platform in sequence, and a nut is assembled at the bottom, and a rubber gasket is also provided between the bolt and the pressure plate, so that the outer ring plate and the support frame are sealed and fastened together.

[0027] like Figure 4 As shown, an inner ring plate 5 is also slidably mounted inside the outer ring plate, and a limit stop 40 is also provided at the end of the outer ring plate to prevent the inner ring plate from sliding upward out of the outer ring plate. The bottom of the outer ring plate and the top of the inner ring plate are respectively inclined and extended toward the direction close to the storage tank, and the ends are provided with lip-shaped outer folded edges, which are respectively in close contact with the tank wall 1, so that a primary sealing cavity is surrounded by the inner ring plate, the outer ring plate and the tank wall. By cooperating with the upper sealing component and the lower sealing component, the entire sealing device can automatically adjust 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, achieving a full range and full process sealing compensation effect, and at the same time effectively avoiding the sealing failure problem caused by liquid level fluctuations.

[0028] like Figure 1 , Figure 4 and Figure 5 As shown, the upper sealing assembly includes 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 bronchial tube 54 and an upper ring pipe 58, etc., wherein one end of the upper top plate 51 contacts the inner wall of the storage tank, and the other end extends in the horizontal direction and is clamped and fixed with the upper clamping block in the inner ring plate. Specifically, a limiting groove 521 is provided near the middle of the inner ring plate, and an upper capsule 524 is sleeved inside the limiting groove along the annular extension direction of the inner ring plate. One side of the upper capsule is fixed to the deep inside of the limiting groove, and a limiting spring 523 is fixed on the other side. The end of the limiting spring is fixed to the upper clamping block 522. The upper clamping block is a U-shaped structure with its opening facing the direction of the upper top plate, and is matched and fixed with the upper top plate.

[0029] In a natural state, when the upper bladder is inflated through the air inlet 525 on the upper bladder, the upper bladder will expand and squeeze toward the upper top plate. During this process, the limit spring 523 is compressed, and at the same time, the upper clamping block 522 and the upper top plate connected thereto are driven to move horizontally toward the tank wall. When the upper bladder is filled with gas and reaches a preset pressure, the top pressure generated by its expansion presses the upper top plate tightly against the tank wall, so that the position of the inner ring plate does not change during the process of the outer ring plate driving the lower sealing body to move up and down.

[0030] At the same time, when the upper top plate contacts the tank wall, an upper sealed chamber 55 is formed between the upper top plate, the inner ring plate and the tank wall, and the upper sealing body 52 is matched and sleeved in the upper sealed chamber. Figure 3 As shown, the bottom of the upper sealing body 52 is fixed to the upper top plate, and a self-plastic inner spring sheet is also sleeved in the upper sealing body. The opening of the self-plastic inner spring sheet faces upward, and the bottom is attached and fixed to the upper sealing body. Under the action of the self-plastic inner spring sheet, the side of the inflated upper sealing body is tightly pressed against the inner wall of the storage tank.

[0031] like Figure 1 , Figure 5 and Figure 6 As shown, an upper annular tube 58 is also provided on the top surface of the floating plate through a fixed seat, and the upper annular tube is connected to the upper air pump 8 through a first air pipe 56. A plurality of upper bronchial tubes 54 are evenly divided on the upper annular tube, each of which is connected to the upper sealing body, and the lower sac is connected to the upper bronchial tube 54 through a lower branch pipe 53, which is used to adjust the exhaust of the gas in the lower sac, and an upper air valve 57 is also connected to the first air pipe, and the suction and discharge state of the upper air pump is controlled by a controller, so as to realize the contraction and expansion adjustment of the upper sealing body, and then realize the adjustment of different extrusion degrees between the upper sealing body and the tank wall, so as to ensure different sealing strengths in the annular space during the lifting and lowering of the floating plate, effectively reduce the friction between the upper sealing body and the tank wall, and reduce wear.

[0032] like Figure 1 and Figure 5 As shown, the lower sealing assembly is similar to the upper sealing assembly, including 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 bronchial pipe 48 and a lower branch pipe 49, etc., wherein the lower top plate 42 is vertically arranged above the outer ring plate and is fixed by a lower clamping block. Specifically, as shown in FIG. Figure 4 As shown, a limiting groove is also provided inside the outer ring plate below the inner ring plate, and a lower clamping plate is mounted in the limiting groove. The side of the lower clamping plate away from the lower top plate is fixedly connected to the lower bladder body by a spring, and the other side of the lower clamping plate is matched and fixedly mounted on the lower top plate. By injecting gas into the lower bladder body to inflate it, the spring can be used to push the lower clamping block to drive the lower top plate to press tightly against the tank wall, thereby flexibly adjusting the position of the lower top plate during the descent of the floating plate, that is, when the lower bladder body is filled with gas and reaches a preset pressure, the top pressure generated by its expansion presses the lower top plate tightly against the tank wall, thereby the position of the outer ring plate does not change during the process of the inner ring plate driving the upper sealing body to move up and down.

[0033] 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, and the lower sealing body is matched and sleeved in the lower sealing chamber. Figure 3 As shown, the top of the lower sealing body 43 is fixed to the lower top plate, and a self-plastic inner spring sheet 421 is also sleeved in the lower sealing body. The opening of the self-plastic inner spring sheet faces downward, and the top is attached and fixed to the lower sealing body. Under the action of the self-plastic inner spring sheet, the side of the inflated lower sealing body is tightly pressed against the inner wall of the storage tank.

[0034] like Figure 1 and 5 As shown, a lower annular tube 44 is also provided on the top surface of the floating plate through a fixed seat, and the lower annular tube is connected to the lower air pump 7 through a second air pipe 46. A plurality of lower bronchial tubes 48 are evenly divided on the lower annular tube, and each lower bronchial tube is connected to the lower sealing body, and the upper sac body is connected to the lower bronchial tube 48 through a lower branch tube 49, which is used to adjust the gas pressure in the upper sac body, and a lower air valve 45 is also connected to the second air pipe, and valves are also installed on the lower bronchial tube 48 and the upper bronchial tube, respectively, corresponding to the control gas passage, and the suction and discharge state of the lower air pump is controlled by the controller, so as to realize the contraction and expansion adjustment of the lower sealing body, and then realize the adjustment of different extrusion degrees between the lower sealing body and the tank wall, so as to ensure different sealing strengths in the annular space during the lifting and lowering of the floating plate, effectively reduce the friction between the lower sealing body and the tank wall, and reduce wear.

[0035] In this embodiment, the outer surfaces of the upper sealing body and the lower sealing body can also be matched with a layer of rubber sealing diaphragm, which is supported by high-performance materials such as nitrile or fluororubber and has excellent elasticity and sealing. The upper sealing body and the lower sealing body can be rubber bladder structures filled with gas, thereby further improving the sealing effect, durability and corrosion resistance. Such a setting enables the storage tank sealing device to also have full compensation capabilities, that is, it can adapt to the large changes in the annular gap caused by the drift of the floating plate, the deformation of the storage tank, etc. When the floating plate drifts due to factors such as medium fluctuations, it can automatically adjust the shape and position of the upper and lower sealing bodies to ensure a close fit with the tank wall, thereby maintaining a stable sealing effect.

[0036] like Figure 4As shown, a plurality of groups of elastic members 6 are evenly arranged along the circumference in the interval between the upper top plate and the lower top plate, and the elastic members include springs 61 and telescopic rods 62, wherein the telescopic rods are vertically installed between the upper top plate and the lower top plate, and the springs are sheathed outside the telescopic rods, and the telescopic rods serve as a support and guide structure for the springs, and the upper and lower top surfaces of the springs press 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 flap rises due to the injection of oil, the lower top plate will move upward accordingly and exert a squeezing effect on the spring above. At the same time, since the upper top plate is in close contact with the inside of the storage tank, the spring is compressed and stores energy. When the upper sealing body is exhausted to reduce its internal pressure, the upper sealing body is moved upward by a certain distance under the action of the spring. Therefore, the elastic member cooperates with the upper sealing assembly and the lower sealing assembly, so that during the lifting process of the floating plate, the controller is used to control the upper air pump and the lower air pump to adjust the gas volume in the upper sealing body and the lower sealing body respectively, so that the two can float up and down with the floating plate while alternately expanding and contracting, thereby adaptively adjusting the friction between the upper sealing body and the lower sealing body and the tank wall, forming an alternating adjustment of strong and weak seals, and effectively reducing the wear between the upper and lower sealing bodies and the tank wall while ensuring the sealing effect.

[0037] Working principle description: When the storage tank high-efficiency full-compensation elastic sealing device provided in this embodiment is working, By injecting oil into the storage tank, the float slowly floats upward with the oil, and uses the support frame to drive the outer ring plate and the lower sealing assembly to move upward at the same time. At the same time, the controller controls the lower air pump to extract air from the lower sealing body, and a small amount of gas enters the upper bladder through the lower branch pipe, causing the upper bladder to expand, so that the upper top plate is in close contact with the tank wall, thereby fixing the position of the inner ring plate; When the cam is in a state of being compressed, the spring is pulled out of the air bag and the air bag is pulled inwards, and the pressure in the cam is increased ...

[0038] Repeat the above steps, adjust the pressure inside the upper sealing body, the lower sealing body, the upper bladder and the lower bladder through the upper and lower air pumps, control their different degrees of contraction and expansion, and realize the periodic contraction and expansion of the sealing device, so that the sealing device moves upward with the floating plate in an intermittent peristaltic manner, so that the upper and lower sealing bodies and the tank wall form an alternating state of strong and weak sealing, which effectively reduces the wear of the rubber sealing body without affecting the up and down sliding of the floating plate. When the floating plate descends, the modules can be adjusted in the reverse direction.

[0039] This embodiment mainly deals with the continuous friction and wear of the sealing device between the storage tank and the floating plate. This embodiment ensures the sealing effect of the storage tank at different liquid levels by dynamically adjusting the sealing state. The intermittent peristaltic movement method significantly reduces the wear of the sealing material caused by continuous friction. The sealing device can automatically adjust the sealing state as the floating plate rises and falls without manual intervention, effectively reducing the sealing failure and replacement frequency caused by wear, and extending the service life of the equipment.

[0040] Embodiment 2: Based on Embodiment 1, this embodiment describes another air path connection method between the upper sac body and the lower sac body.

[0041] In this embodiment, Figure 7 As shown, the upper sac is connected to the lower sac through an auxiliary pipe 91, the output pipe of the auxiliary pipe is connected to the auxiliary air pump 9, and an auxiliary pressure valve 92 is also installed on the auxiliary pipe. The auxiliary air pump 9 controls the internal pressure of the upper sac and the lower sac individually, and the auxiliary pressure valve is used to achieve the patency of different air paths. That is, through the operation of the auxiliary air pump 9, gas can be injected into or extracted from the upper and lower sacs, thereby changing their internal pressures. The auxiliary pressure valve 92 is installed on the auxiliary pipe 91 to control the patency of different air paths. By adjusting the opening or 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, so that the upper and lower sacs can shrink and expand adaptively with the different states of strong sealing and weak sealing, thereby changing the contact state with the tank wall and achieving the adjustment of the sealing effect.

[0042] Through the design of the auxiliary pipe 91 and the auxiliary air pump 9, this embodiment can achieve independent control of the internal pressure of the upper sac and the lower sac, improve the flexibility of air path regulation, and the independent air pressure regulation system reduces mutual interference between systems, improves the stability and reliability of the entire sealing device, and is more convenient during maintenance and inspection.

[0043] Embodiment 3, based on Embodiment 2, this embodiment describes another shape structure of the adjustment structure between the lower top plate and the outer ring plate. It should be noted that the adjustment structure between the upper top plate and the inner ring plate has the same principle, and this embodiment is described by taking the lower top plate as an example.

[0044] In this embodiment, Figure 8 As shown, a clamping groove 10 is opened in the outer ring plate along its annular extension direction, and the lower top plate 42 extends into the clamping groove, and a rubber-type fixed capsule 103 is fixed at its end. A fixed clamping tooth is provided on the fixed capsule away from the lower top plate, and a top-pressing capsule 10 is also provided deep in the clamping groove 10. The inner side of the top-pressing capsule is fixed to the inner wall of the clamping groove, and the other side is provided with a top-pressing clamping tooth 102 matching the fixed clamping tooth on the fixed capsule 103. When gas is injected into the top-pressing capsule 101 through the air pipe, the top-pressing capsule expands, and the fixed clamping teeth on the adjacent side are matched and engaged with the top-pressing clamping teeth 102, and as the top-pressing capsule continues to expand, the fixed capsule 103 is continuously pressed inward, so that the lower top plate 42 is in close contact with the tank wall, and the position of the lower top plate is restricted; when the internal pressure of the top-pressing capsule decreases, it will shrink again, so that the meshing of the two is loosened, the fixed capsule returns to its original state, and drives the lower top plate to reset.

[0045] In this embodiment, by injecting or releasing gas into the top pressure bladder, the expansion or contraction thereof can be flexibly controlled, thereby realizing rapid and precise adjustment of the position of the lower top plate. This non-mechanical adjustment method is easy to operate and has a fast response speed. When maintenance or replacement of parts is required, the gas in the top pressure bladder can be easily released to loosen and reset the parts, which is convenient for maintenance or replacement.

[0046] Embodiment 4, based on the above embodiments 1-3, this embodiment provides a method for installing a high-efficiency full-compensation elastic sealing device for a storage tank, comprising the following steps: 1. Place the support frame on the side of the floating plate and adjust the position to ensure that it is horizontal and stable. Use bolts to fix the inner side of the support frame to the floating plate. The present invention uses a fully liquid-contacted stainless steel honeycomb floating plate. The main body of the floating plate adopts a stainless steel structure, and the honeycomb (honeycomb) box is made of S30408; the honeycomb (honeycomb) core is made of 3003H18; before installing the sealing device, the floating plate needs to be inspected and protected. It is strictly forbidden to contact with carbon steel materials, and avoid contact with strong acidic or alkaline substances; at the same time, the welding scars, burrs and other obstacles on the tank wall that may damage the sealing device are cleaned and polished to ensure that the floating plate seal can be lifted and lowered normally without jamming; 2. Install the lower top plate vertically on the outer ring plate by bolts, so that the bottom of the outer ring plate is in close contact with the tank wall to form a lower sealed chamber, and fit the lower sealing body into the lower sealed chamber; ensure the sealing of the connection during installation; 3. Install the upper top plate and the inner ring plate vertically, so that the top of the inner ring plate is in close contact with the tank wall to form an upper sealed chamber, and fit the upper sealing body into the upper sealed chamber; and evenly distribute the elastic parts along the circumference and fix them between the upper and lower top plates; 4. Fix the outer ring plate to the support frame with bolts, install the support plate, U-shaped pressure plate and through bolts, and tighten the nuts to firmly combine the outer ring plate with the support frame; 5. Connect the upper air pump to the upper ring tube through the first air pipe, and install an upper air valve on the first air pipe. Each upper bronchial tube is branched from the upper ring tube and connected to the upper sealing body respectively; connect the lower air pump to the lower ring tube through the second air pipe, and install a lower air valve on the second air pipe. Each lower bronchial tube is branched from the lower ring tube and connected to the lower sealing body respectively; connect the upper bladder body to the lower sealing body through the lower branch pipe, connect the lower bladder body to the upper sealing body through the upper branch pipe, and install a valve on the air path; 6. The controller drives the upper and lower air pumps to inject gas into the upper and lower sealing bodies respectively to expand them, ensuring that the sides of the upper and lower sealing bodies are in close contact with the tank wall; in the initial state, the upper and lower sealing bodies are both in an expanded state and in close contact with the inner wall of the tank to form a strong seal; 7. After all installations are completed, a water filling test shall be conducted. Clean fresh water shall be used for the water filling test, and the pH value shall be 6.0-8.3. The chloride content in the water shall be less than 25×10-6㎏ / L. The water temperature shall not be lower than 5℃ and shall not be greater than 50℃. The contact time between the internal floating roof and water shall not exceed 7 days, and the longest shall not exceed 21 days. During the water filling test, the internal floating roof shall rise steadily from the lowest position to the highest design liquid level and then stand for 2 hours. When there is no abnormality in the whole process, the water can be drained to the lowest liquid level. During the water draining process, the internal floating roof shall descend steadily. During the internal floating roof water filling and lifting test, the installation unit shall always have a dedicated person to monitor. If any problem is found, the water filling shall be stopped and repaired in time. The water filling test can be continued after the repair. In addition, during the water filling test, the steps in the above embodiment 1 are used to perform preliminary debugging on the sealing device to check whether it can normally adjust the gas volume in the upper sealing body and the lower sealing body, and to observe whether the sealing device can move with the floating plate and maintain effective sealing, and a comprehensive airtightness test is performed to ensure that the entire sealing device is leak-free; 8. After the water filling and lifting test is completed and passed the inspection, the accumulated water, mud and other dirt in the tank shall be cleaned up immediately so that the storage tank can be put into use.

[0047] The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. The basic concept of the present invention is to achieve alternation between strong and weak seals by dynamically adjusting the states of the upper and lower sealing components, avoiding continuous sliding contact between the rubber seal and the inner wall of the storage tank, and ensuring efficient sealing between the inner wall of the storage tank and the floating plate at any liquid level to prevent volatilization and leakage of the medium; and the present invention drives the upper seal and the lower seal to move alternately, effectively reducing the continuous friction between the rubber seal and the tank wall, so as to achieve efficient and uninterrupted sealing of the annular space between the inner wall of the storage tank and the floating plate, while significantly reducing the wear of the sealing material and extending the service life of the sealing device; at the same time, through the connection of the gas path system, the automation and intelligent control of the sealing process is realized, which improves the convenience and safety of the operation. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A highly efficient fully compensated elastic sealing device for a storage tank, characterized in that: It includes a support frame, an upper sealing assembly and a lower sealing assembly. The support frame is fixed to the side of the floating plate, and an outer ring plate is fixed on the side away from the floating plate. An inner ring plate is slidably sleeved inside the outer ring plate. The bottom of the outer ring plate and the top of the inner ring plate are inclined and extend toward the direction close to the storage tank, and the ends thereof are in close contact with the inner wall of the storage tank. The lower sealing assembly includes 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 tightly attached to the inner wall of the storage tank. The upper sealing assembly comprises an upper top plate, an upper sealing body, an upper bladder body and an upper clamping plate. The upper clamping plate is arranged in the inner ring plate, and the upper bladder body is fixed inside the upper clamping plate. One end of the upper top plate contacts the inner wall of the storage tank, and the other end extends in the horizontal direction and is clamped and fixed to the upper clamping plate in the inner ring plate, so that an upper sealing chamber is formed between the upper top plate, the inner ring plate and the tank wall. 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. There are multiple groups of elastic members spaced along the circumference between the upper top plate and the lower top plate; the upper sealing body and the lower sealing body are filled with gas and are connected to the upper air pump and the lower air pump respectively; the lower sealing body is connected to the upper bladder body through the air pipe; When the floating plate floats up and down, the controller is used to control the upper air pump and the lower air pump to adjust the amount of gas in the upper sealing body and the lower sealing body respectively, so that the two float up and down with the floating plate while alternately expanding and contracting, thereby forming a dynamic adjustment of strong sealing and weak sealing states.

2. The high-efficiency fully-compensated elastic sealing device for a storage tank according to claim 1 is characterized in that: The inner side of the support frame is fixedly connected to the floating plate by bolts, and the top is bent inward to form a support platform; The outer side wall of the support frame is fixedly connected to the outer ring plate by bolts, and a support plate is provided inwardly along the horizontal direction on one side of the outer ring plate adjacent to the support frame.

3. The high-efficiency fully-compensated elastic sealing device for a storage tank according to claim 2 is characterized in that: The support frame also includes a U-shaped pressure plate and a through bolt. The support plate is arranged above the support platform, and the opening of the U-shaped pressure plate presses downward on the support plate. The through bolt passes through the U-shaped pressure plate, the support plate and the support platform in sequence along the vertical direction, and a nut is assembled at the bottom, so that the outer ring plate and the support frame are fastened together.

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

5. The high-efficiency fully-compensated elastic sealing device for a storage tank according to claim 4 is characterized in that: The outer surfaces of the upper sealing body and the lower sealing body can also be matched with a layer of rubber sealing diaphragm, and the rubber sealing diaphragm is nitrile or fluororubber.

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

7. The high-efficiency fully-compensated elastic sealing device for a storage tank according to claim 1 is characterized in that: A limit stop is also provided at the top port of the outer ring plate.

8. The high-efficiency fully-compensated elastic sealing device for a storage tank according to claim 1 is characterized in that: The lower sealing assembly also includes a lower clamping plate and a lower sac body; an annular groove is provided inside the outer ring plate below the inner ring plate, and the lower clamping plate is mounted in the annular groove; the lower clamping plate is fixedly connected to the lower sac body on the side away from the lower top plate, and the lower sac body is connected to the upper sealing body; the lower clamping plate is clamped and fixed to the lower top plate.

9. The high-efficiency fully-compensated elastic sealing device for a storage tank according to claim 1 is characterized in that: An upper ring tube and a lower ring tube are fixed on the floating plate by means of mounting buckles; the upper air pump is connected to the upper ring tube via a first air pipe; upper bronchial tubes are evenly arranged on the upper ring tube, each upper bronchial tube is respectively connected to an upper sealing body, and an upper air valve is installed on the first air pipe; the lower air pump is connected to the lower ring tube via a second air pipe; lower bronchial tubes are evenly arranged on the lower ring tube, each lower bronchial tube is respectively connected to a lower sealing body, and a lower air valve is installed on the second air pipe.

10. A method for installing a high-efficiency fully-compensated elastic sealing device for a storage tank, using the high-efficiency fully-compensated elastic sealing device for a storage tank as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Place the support frame on the side of the floating plate and adjust the position to ensure that it is level and stable. Use bolts to fix the inner side of the support frame to the floating plate. Step 2: vertically install the lower top plate above the outer ring plate so that the bottom of the outer ring plate is in close contact with the tank wall to form a lower sealed chamber, and fit the lower sealing body into the lower sealed chamber; Step 3, vertically install the upper top plate and the inner ring plate, so that the top of the inner ring plate is in close contact with the tank wall to form an upper sealed chamber, and fit the upper sealing body into the upper sealed chamber; and evenly distribute the elastic parts along the circumference and fix them between the upper and lower top plates; Step 4: Fix the outer ring plate to the support frame with bolts, install the support plate, U-shaped pressure plate and through bolts, and tighten the nuts to firmly combine the outer ring plate with the support frame; Step 5, connecting the upper air pump to the upper ring tube through the first air pipe, and installing an upper air valve on the first air pipe, so that each upper bronchial tube is separated from the upper ring tube and connected to the upper sealing body respectively; connecting the lower air pump to the lower ring tube through the second air pipe, and installing a lower air valve on the second air pipe, so that each lower bronchial tube is separated from the lower ring tube and connected to the lower sealing body respectively; Step 6: Use the controller to drive the upper and lower air pumps to inject gas into the upper and lower sealing bodies to expand them, ensuring that the sides of the upper and lower sealing bodies are in close contact with the tank wall; and connect the upper bladder body to the lower sealing body through the lower bronchus, and connect the lower bladder body to the upper sealing body through the upper bronchus.

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