Mechanical self-compensating floating roof sealing unit and floating roof device

Abstract

The present invention provides a mechanical self-compensating floating roof sealing unit, including a support plate connected to the tank wall via a metal spring sheet, a support member provided at one end of the support plate away from the metal spring sheet, and a self-compensating mechanism. The self-compensating mechanism includes a guide rail arranged opposite to the support member and a driving member disposed between the support member and the guide rail. The driving member is configured to perform self-compensation of sealing pressure when the metal spring sheet deforms with the tank wall.

Description

Technical Field

[0001] This invention relates to the field of VOCs emission prevention, energy conservation and emission reduction technology for floating roof tanks, specifically to a mechanical self-compensating floating roof sealing unit and a floating roof device. Background Technology

[0002] For floating roof tanks, due to the poor sealing of the floating roof edge, VOCs continue to volatilize, posing safety hazards and resulting in poor energy conservation and emission reduction effects.

[0003] The current sealing structure of floating roof tanks has the following problem: after a certain period of service, the tank wall begins to deform outward, at which point gaps begin to form between the edge of the floating roof and the tank wall, leading to oil evaporation. Existing technology typically achieves sealing through an array of spring-loaded sealing elements.

[0004] CN105540081B discloses a spring-compensated soft sealing device for external floating roof oil tanks, including multiple sealing components disposed around the perimeter of the floating roof. A spring compensation mechanism connected to each sealing component is disposed on the floating roof. The spring compensation mechanism includes a pressure connecting rod and a return spring. One end of the pressure connecting rod is connected to the sealing component, and the other end is connected to the return spring. The elastic force of the return spring causes the pressure connecting rod to constantly press the sealing component outwards from the floating roof. The sealing component includes a movable pressure plate connected to the spring compensation mechanism on one side, and an open-cell sponge and a closed-cell sponge tightly attached to the tank wall on the other side of the movable pressure plate, with the closed-cell sponge positioned above the open-cell sponge. This device uses a torsion spring to push the pressure plate, thereby achieving a sealing pressure. However, this pressure decreases after the tank deforms, making it difficult to achieve a sealing effect.

[0005] CN110454573A discloses a composite sealing device with an ultra-hydrophobic and hydrophobic surface for floating roof tanks, including a pressure plate, a diaphragm, a labyrinth groove, a secondary sealing sponge, an upper fixing plate, bolts, gaskets, nuts, springs, rubber wrapping tape, a primary sealing sponge, an outer support plate, a lower fixing plate, and an inner support plate. The primary seal includes the upper fixing plate, spring, rubber wrapping tape, primary sealing sponge, outer support plate, lower fixing plate, and inner support plate. The secondary seal includes the pressure plate, diaphragm, labyrinth groove, secondary sealing sponge, bolts, gaskets, and nuts. Within the primary seal, the inner support plate is attached to the edge of the floating roof. The upper and lower fixing plates are connected to the inner support plate, one side of the spring is connected to the inner support plate, and the other side of the spring is connected to the outer support plate. The outer support plate can slide between the upper and lower fixing plates along the inner and outer sides. One side of the outer support plate is connected to the spring, and the other side is attached to the rubber wrapping tape. The outer side of the rubber wrapping tape has a polymer coating with nano-interface, which has ultra-hydrophobic and hydrophobic properties. The other side of the rubber wrapping tape is attached to the tank wall. The device uses a linear compression spring to push the pressure plate, thus providing a sealing pressure. However, this pressure decreases as the storage tank deforms, causing the compression spring to stretch and reducing the force on the spring, making it difficult to guarantee a sealing effect.

[0006] CN105236038B discloses a composite mechanical seal device and its installation method. The composite mechanical seal device includes a rain shield mounted on top of a floating tank. Its features include: a scraper below the rain shield; an upper support column at the top of the floating tank; and an elastic plate at the bottom of the floating tank. A shoe plate is positioned between the upper support column and the elastic plate. An oil-gas diaphragm is mounted on the elastic plate, with a diaphragm pressure strip fixed by rivets. The elastic plate is made of elastic metal. The shoe plate is fixed to the tank wall by upper and lower support devices. The upper support device is a freely retractable upper support column, and the lower support device is an elastic plate that presses the shoe plate against the tank wall using its elasticity. However, this device struggles to maintain a sealing effect even after the tank deforms, relying solely on the spring force.

[0007] Therefore, although the above method causes the spring to deform outward when the storage tank deforms outward, the pressure exerted by the deformed spring on the tank wall decreases, and the sealing effect begins to deteriorate. Thus, it cannot meet the sealing pressure requirements after the tank wall deforms.

[0008] Therefore, it is desirable in the art to provide a mechanical self-compensating floating roof sealing unit and a floating roof device to solve the above-mentioned technical problems. Summary of the Invention

[0009] The purpose of this invention is to provide a mechanical self-compensating floating roof sealing unit and a floating roof device, which can convert the linear force of a linear spring into a nonlinear longitudinal force, so that the mechanical self-compensating floating roof sealing unit can more easily adapt to the deformation of the tank wall, thereby improving the sealing effect of the floating roof.

[0010] According to a first aspect of the present invention, a mechanical self-compensating floating roof sealing unit is provided, comprising a support plate, wherein a metal spring sheet for contacting the tank wall is provided at a side end of the support plate.

[0011] The self-compensating mechanism includes a guide rail arranged opposite to the support member, and a driving member disposed between the support plate and the guide rail.

[0012] The drive component is configured to self-compensate for sealing pressure as the metal spring deforms with the tank wall.

[0013] In one embodiment, the drive element includes two support seats spaced apart on the inner wall of the support plate, and a first gear rod and a second gear rod respectively rotatably connected to the two support seats.

[0014] In one embodiment, a circular hole is provided at the first end of the guide rail, and the fixed end of the first gear rod is adapted to the circular hole by a first cylindrical pin to be fixedly installed on the guide rail.

[0015] In one embodiment, a groove is provided at the second end of the guide rail, and a slider is provided in the groove. The fixed end of the second gear rod is fixedly connected to the slider through a second cylindrical pin.

[0016] In one embodiment, the self-compensating mechanism further includes a linear spring disposed below the guide rail and connected to the first cylindrical pin and the second cylindrical pin respectively.

[0017] When the metal spring deforms outward along with the tank wall, the linear spring contracts inward to drive the second cylindrical pin and the slider to slide laterally in the groove, thereby causing the support plate to move forward and squeeze the metal spring to rebalance.

[0018] In one embodiment, the free end of the first gear shaft is meshed with the free end of the second gear shaft.

[0019] In one embodiment, the support plate is configured as an arc-shaped structure, and the metal spring is fixed to the support plate by bolts.

[0020] In one embodiment, the self-compensating mechanism further includes a floating roof plate disposed below the guide rail, and edge reinforcing ribs disposed on the floating roof plate.

[0021] In one embodiment, a plurality of the edge reinforcing ribs are arranged at intervals along the length direction of the upper plate of the floating table.

[0022] In one embodiment, the self-compensating mechanism further includes an L-shaped support plate covering the upper plate of the floating table, and a limiting groove for accommodating the guide rail is formed on the L-shaped support plate.

[0023] In one embodiment, a sealing diaphragm is provided between the L-shaped support plate and the support plate, and the sealing diaphragm is fixed to the L-shaped support plate and the support plate by bolts.

[0024] According to a second aspect of the invention, the floating roof device is configured in a disc-shaped form, comprising a plurality of mechanically self-compensating floating roof sealing units arranged circumferentially and continuously within the storage tank, as described above.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] Firstly, this device can convert the linear force of the linear spring into a nonlinear longitudinal force, making the mechanical self-compensating floating roof sealing unit more adaptable to the deformation of the tank wall, thereby improving the sealing effect of the floating roof.

[0027] Furthermore, this device utilizes a gear-connecting rod and spring mechanism to achieve self-compensation of the sealing pressure between the metal spring and the tank wall. This adapts to the deformation of the floating roof tank, further improving the sealing effect at the edge of the floating roof and preventing VOCs from evaporating, thereby enhancing the floating roof's oil and gas treatment capabilities. Additionally, when the tank wall deforms, the mechanical self-compensating floating roof sealing unit can compensate for the sealing pressure between the metal spring and the tank wall, mitigating the deterioration of the sealing effect after deformation.

[0028] Secondly, this invention can assemble multiple mechanical self-compensating floating roof sealing units into a complete disc-shaped structure, thereby enhancing the sealing performance of the storage tank, solving the safety hazards and VOCs volatilization problems, and further suppressing oil volatilization and VOCs emission reduction from the source. Attached Figure Description

[0029] The invention will now be described in detail with reference to the accompanying drawings, in which:

[0030] Figure 1 The schematic diagram illustrates the structure of the mechanical self-compensating floating roof sealing unit according to the present invention;

[0031] Figure 2 This is a first disassembled diagram of the mechanical self-compensating floating roof sealing unit according to the present invention;

[0032] Figure 3 This is a second disassembled view of the mechanical self-compensating floating roof sealing unit according to the present invention;

[0033] Figure 4This is a third disassembled diagram of the mechanical self-compensating floating roof sealing unit according to the present invention;

[0034] Figure 5 This is a fourth disassembled diagram of the mechanical self-compensating floating roof sealing unit according to the present invention;

[0035] Figure 6 This is a first force analysis diagram of the mechanical self-compensating floating roof sealing unit according to the present invention;

[0036] Figure 7 This is a second force analysis diagram of the mechanical self-compensating floating roof sealing unit according to the present invention;

[0037] Figure 8 The pressure curve Fy exerted by the self-compensating mechanism on the tank wall is shown.

[0038] Figure 9 yes Figure 8 The workspace analysis diagram is formed based on this.

[0039] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0040] The meanings of the reference numerals in the attached figures are as follows:

[0041] 11 Support plate, 12 Metal spring, 13 Support base, 14 Linear spring, 15 Floating plate, 16 Edge reinforcing rib, 17 L-shaped support plate, 171 Limiting groove, 18 Sealing diaphragm;

[0042] 20 Guide rail, 21 Slide groove, 22 Slider;

[0043] 31. First gear shaft; 32. Second gear shaft;

[0044] 311 First cylindrical pin, 321 Second cylindrical pin. Detailed Implementation

[0045] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0046] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

[0048] Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The invention will now be further described with reference to the accompanying drawings.

[0050] Figure 1 The schematic diagram illustrates the structure of the mechanical self-compensating floating disk sealing unit 100 according to the present invention.

[0051] like Figure 1 As shown, according to a first aspect of the present invention, a mechanical self-compensating floating roof sealing unit 100 is provided, mainly comprising a support plate 11 and a self-compensating mechanism. The first end of the support plate 11 contacts the inner wall of the storage tank (not shown in the figures) via a metal spring 12, and the self-compensating mechanism is disposed at the second end of the support plate 11.

[0052] From this point on, the self-compensating mechanism can perform self-compensation of sealing pressure when the metal spring 12 deforms along with the tank wall, as described below. Therefore, after the tank deforms outward, the mechanical self-compensating floating roof sealing unit 100 exerts greater sealing pressure on the tank wall, helping to eliminate the problem of deteriorated sealing performance after tank wall deformation.

[0053] Figure 2 This is a first disassembled view of the mechanical self-compensating floating disk sealing unit 100 according to the present invention;

[0054] Figure 3 This is a second disassembled view of the mechanical self-compensating floating disk sealing unit 100 according to the present invention;

[0055] Figure 4 This is a third disassembled view of the mechanical self-compensating floating disk sealing unit 100 according to the present invention.

[0056] In one embodiment, such as Figure 2 , 3 As shown in Figure 4, the self-compensating mechanism includes a guide rail 20 arranged opposite to the support member, and a driving member disposed between the support member and the guide rail 20. Preferably, the driving member is configured to perform self-compensation of sealing pressure when the metal spring 12 deforms with the tank wall.

[0057] Figure 5This is a fourth disassembly diagram of the mechanical self-compensating floating roof sealing unit 100 according to the present invention.

[0058] Preferably, the drive component is constructed as a gear linkage mechanism, and the mechanical self-compensating floating disk sealing unit 100 also includes a linear spring 14 disposed below the guide rail 20. Thus, the drive component and the linear spring 14 can be configured as a gear linkage spring mechanism, which can convert the lateral tensile force of a common linear tension spring into a nonlinear longitudinal force.

[0059] Therefore, when the tank wall deforms outward, the elastic force of the metal spring 12 decreases, the linear spring 14 contracts, thereby causing the slider 21 to slide, which in turn causes the first gear rod 31 (described below) and the second gear rod 32 (described below) to rotate, thereby causing the support plate 11 to move forward. At this time, the thrust on the support plate 11 of the entire mechanism increases, so as to recompress the metal spring 12 and the tank wall, so that the metal spring 12 generates greater elastic force to reach a new equilibrium state, thereby improving the sealing effect of the floating roof.

[0060] In one embodiment, the driving component includes two support seats 13 spaced apart on the inner wall of the support plate 11, and a first gear rod 31 and a second gear rod 32 arranged symmetrically. Preferably, the first ends of the first gear rod 31 and the second gear rod 32 are respectively connected to the support seats 13, and the second ends of the first gear rod 31 and the second gear rod 32 are respectively connected to the two ends of the guide rail 20.

[0061] Preferably, the two gear rods are provided with gears of the same size at their first ends, so that the two gear rods can form a stable meshing relationship through the gears, which helps the subsequent self-compensation work. In addition, the gears can also be fixedly connected to the support seat 13 through the positioning pin to ensure that the gear linkage mechanism can operate stably.

[0062] In one embodiment, a circular hole is provided at the first end of the guide rail 20. Preferably, the fixed end of the first gear rod 31 can be locked to the circular hole via a first cylindrical pin 311, thus allowing the first gear rod 31 to be fixedly mounted on the guide rail 20, thereby restricting the movement path of the first gear rod 31. In this way, the first gear rod 31 will have the ability to rotate around the first cylindrical pin 311, which is beneficial for subsequent self-compensation.

[0063] In one embodiment, such as Figure 2 , 3 As shown in Figure 4, a groove 21 is provided at the second end of the guide rail 20. Preferably, the groove 21 is constructed into a rectangular structure, and a matching slider 22 is provided within the groove 21. It is easy to understand that, under the constraint of the groove 21, the slider 22 can only move laterally along the length direction of the guide rail 20.

[0064] Preferably, the fixed end of the second gear rod 32 can be connected to the slider 22 via the second fixing pin 321 (i.e., the pin shaft). In this invention, the two ends of the linear spring 14 are fixedly connected to the first cylindrical pin 311 and the second cylindrical pin 321, respectively.

[0065] Therefore, under the action of the linear spring 14, the second fixed pin 321 can be driven to move axially, thereby causing the slider 22 to slide laterally in the groove 21, and further causing the second gear rod 32 to rotate around the support base 13. At the same time, the first gear rod 31 will also move in coordination, so as to make the support plate 11 move forward or backward, thereby realizing the self-compensation function of the mechanical self-compensating floating disk sealing unit 100.

[0066] Preferably, the first gear rod 31, the second gear rod 32, and the guide rail 20 are configured as a self-compensating adjustment system with a closed triangular structure. Simultaneously, under the action of the support plate 11, the first cylindrical pin 311, the second cylindrical pin 321, and the slider 22, this self-compensating adjustment system is capable of meeting the sealing pressure requirements after deformation of the tank wall.

[0067] In this invention, when the tank wall deforms outward, the elastic force of the metal spring 12 decreases. At this time, the longitudinal force generated by the linear spring 14 will be greater than the elastic force of the metal spring 12. Therefore, the linear spring 14 needs to contract inward, thereby driving the second fixing pin 321 to move axially so that the slider 22 slides laterally in the slide groove 21, thereby causing the second gear rod 32 to rotate around the support base 13. At the same time, the first gear rod 31 will also move in coordination. In this way, the support plate 11 will move forward under the action of the gear linkage mechanism. Due to the special structure of this device, when the support plate 11 moves forward, the entire mechanism will increase the thrust on the support plate 11, thereby causing the metal spring 12 to generate a greater elastic force, thus restoring the balance state and ensuring the sealing performance between the metal spring 12 and the tank wall.

[0068] In this way, the lateral linear force of the linear spring 14 can be converted into a nonlinear longitudinal force, so that the mechanical self-compensating floating roof sealing unit 100 can more easily adapt to the deformation of the tank wall, thereby improving the sealing effect of the floating roof.

[0069] Preferably, when the tank wall deforms outward, the self-compensating mechanism moves outward accordingly, compensating for the force exerted by the metal spring 12 on the tank wall. Conversely, when the tank wall deforms inward, the self-compensating mechanism moves inward as well, similarly compensating for the force exerted by the metal spring 12 on the tank wall. Therefore, this device achieves self-compensation by controlling the sealing pressure between the metal spring 12 and the tank wall, making it easier to adapt to the deformation of the floating roof tank wall and further improving the sealing effect at the edge of the floating roof.

[0070] Therefore, this device can achieve self-compensation of the sealing pressure between the metal spring 12 and the tank wall through the gear connecting rod spring mechanism, thereby adapting to the deformation of the floating roof tank and further improving the sealing effect of the floating roof edge to prevent VOCs volatilization, thus improving the function of floating roof oil and gas treatment.

[0071] In this invention, the length direction of the guide rail 20 is the transverse direction, and conversely, the direction perpendicular to the guide rail 20 is the longitudinal direction.

[0072] In one embodiment of the present invention, such as Figure 1 and 2 As shown, the support plate 11 is constructed in an arc shape and the metal spring 12 is constructed in a U-shape, and one side of the metal spring 12 is fixed to the support plate 11 by bolts.

[0073] It is easy to understand that the force exerted by the metal spring 12 on the tank wall will change as the tank wall deforms. However, since this device adopts a self-compensation adjustment system, the force exerted by the metal spring 12 on the tank wall can be compensated by the self-compensation mechanism when the metal spring 12 deforms, thus making it easier to adapt to the deformation of the floating roof tank wall and further improving the sealing effect of the floating roof edge.

[0074] In one embodiment, such as Figure 1 As shown, the self-compensation mechanism also includes an L-shaped support plate 17, and a limiting groove 171 is formed on the upper end face of the L-shaped support plate 17. Preferably, the guide rail 20 can be smoothly nested in the limiting groove 171, thereby effectively protecting the linear spring 14 and the guide rail 20 itself, and further improving the service life of the device.

[0075] In one embodiment, such as Figure 1 and 2 As shown, the self-compensation mechanism also includes a floating plate 15 disposed below the L-shaped support plate 17. Preferably, the floating plate 15 matches the L-shaped support plate 17, and the two are connected together by welding to form a U-shaped structure, thereby improving the protection of the linear spring 14 and the guide rail 20.

[0076] In one embodiment, such as Figure 2 As shown, the self-compensation mechanism also includes multiple edge reinforcing ribs 16 disposed on the upper plate 15 of the floating roof. Preferably, the edge reinforcing ribs 16 abut against the inner wall of the L-shaped support plate 17. In this way, the overall rigidity of the L-shaped support plate 17 is significantly improved, which not only enhances the protection of the linear spring 14 and the guide rail 20, but also improves the service strength of the self-compensation adjustment system, thereby ensuring that it can work for a long time in the storage tank.

[0077] Preferably, a plurality of spaced-apart edge reinforcing ribs 16 are provided along the length of the upper plate 15 of the floating roof. Preferably, the edge reinforcing ribs 16 are constructed in a roughly triangular structure to improve the firmness and stability between the upper plate 15 of the floating roof and the L-shaped support plate 17.

[0078] In one embodiment, a sealing diaphragm 18 is provided between the L-shaped support plate 17 and the support plate 11. Preferably, the sealing diaphragm 18 is configured in a U-shape and is fixed to the L-shaped support plate 17 and the support plate 11 by bolts. It is worth noting that the sealing diaphragm 18 has a certain degree of elasticity, so when the tank wall deforms, the metal spring 12 and the support plate 11 will also move synchronously, thereby ensuring that the sealing diaphragm 18 does not break, further improving the sealing performance of the self-compensating adjustment system.

[0079] According to a second aspect of the invention, a floating roof device is provided. Preferably, the floating roof device includes a plurality of mechanically self-compensating floating roof sealing units 100 arranged circumferentially and continuously within a storage tank, as described above. Therefore, when the plurality of mechanically self-compensating floating roof sealing units 100 are joined together, they can form a complete disc-shaped structure, thereby effectively sealing the storage tank.

[0080] The installation and use process of this device is briefly described below:

[0081] This device requires multiple mechanical self-compensating floating roof sealing units 100 to be interconnected circumferentially to form a disc-shaped structure, which is then installed inside the storage tank to achieve the self-compensation function.

[0082] Inside the storage tank, the force exerted by the metal spring 12 on the tank wall changes as the tank wall deforms. However, the mechanical self-compensating floating roof sealing unit 100 has a self-compensating adjustment system, so that when the metal spring 12 deforms, it can compensate for the force exerted on the tank wall through the self-compensating mechanism, thus more easily adapting to the deformation of the floating roof tank wall and further improving the sealing effect of the floating roof edge.

[0083] Preferably, the mechanical self-compensating floating roof sealing unit 100 is mainly composed of a first gear rod 31, a second gear rod 32, and a guide rail 20, forming a closed triangular self-compensating adjustment system. Under the action of the support plate 11, the first cylindrical pin 311, the second cylindrical pin 321, and the slider 22, it can perform self-compensating adjustment. Preferably, this device converts the linear force of the linear spring 14 into a non-linear longitudinal force, allowing the mechanical self-compensating floating roof sealing unit 100 to more easily adapt to the deformation of the tank wall, thereby improving the sealing effect of the floating roof.

[0084] In short, when the tank wall deforms outward, the self-compensating mechanism moves outward accordingly, compensating for the force exerted on the tank wall by the metal spring 12. Conversely, when the tank wall deforms inward, the self-compensating mechanism moves inward as well, similarly compensating for the force exerted on the tank wall by the metal spring 12. Thus, this device achieves self-compensation by regulating the sealing pressure between the metal spring 12 and the tank wall, making it easier to adapt to the deformation of the floating roof tank wall and further improving the sealing effect at the edge of the floating roof.

[0085] Specifically, when the tank wall deforms outward, the elastic force of the metal spring 12 decreases. At this time, the longitudinal force generated by the linear spring 14 will be greater than the elastic force of the metal spring 12. Therefore, the linear spring 14 needs to contract inward, thereby driving the second fixing pin 321 to move axially so that the slider 22 slides laterally in the slide groove 21. This causes the second gear rod 32 to rotate around the support base 13, and the first gear rod 31 will also move in coordination. In this way, the support plate 11 will move forward under the action of the gear linkage mechanism to increase the thrust, thereby causing the metal spring 12 to generate a greater elastic force, thus restoring the equilibrium state and ensuring the sealing performance between the metal spring 12 and the tank wall.

[0086] The following uses different embodiments to deduce the variation law of the force in the direction (lateral) and vertical direction (longitudinal) of the linear spring 14 when the device is performing self-compensation operation. The specific content is as follows.

[0087] Example 1

[0088] Figure 6 This is a first stress analysis diagram of the mechanical self-compensating floating roof sealing unit 100 according to the present invention.

[0089] This embodiment uses the force analysis method, such as Figure 6 As shown, a force analysis is performed on point O:

[0090] By the Pythagorean theorem:

[0091]

[0092] Further, we obtain:

[0093]

[0094] Since the force triangle is similar to the structure triangle, we get:

[0095]

[0096] in,

[0097] Fx=k(x-l0)

[0098] Therefore, we obtain,

[0099]

[0100] because,

[0101]

[0102] Therefore, we obtain,

[0103]

[0104] Example 2

[0105] Figure 7 This is a second force analysis diagram of the mechanical self-compensating floating disk sealing unit 100 according to the present invention.

[0106] This embodiment uses the principle of virtual work, such as... Figure 7 As shown, according to the Pythagorean theorem, we have:

[0107]

[0108] Where, the expression for y is:

[0109]

[0110] Taking the differential of the function, we get:

[0111]

[0112] Based on the static force of virtual work:

[0113] Fx·dx=Fy·dy

[0114] Where Fx is the tension of the spring.

[0115]

[0116] Fy can be obtained from this, as shown below:

[0117]

[0118] Example 3

[0119] Figure 8 The pressure curve Fy exerted by the self-compensating mechanism on the tank wall is shown.

[0120] Assuming the spring stiffness k = 1000 N / m, the initial spring length l0 = 0.03 m, b = 0.06 m, and c = 0.02 m, inputting these parameters and formulas into Matlab will yield the following results: Figure 8 The pressure curve Fy of the self-compensating mechanism on the tank wall is shown below. The following content provides a practical demonstration.

[0121] For example, when inputting into Matlab,

[0122] >>xlabel('y'),ylabel('F')

[0123] >>y=0:0.0025:0.06;

[0124] t = 0.06 * 0.06 - y * y;

[0125] m = (2 * t - 0.01) / t;

[0126] F = -2 * 1000 * y / m;

[0127] plot(y,F)

[0128] >>xlabel('y(m)'),ylabel('Fy(N)')

[0129] Example 4

[0130] Figure 9 yes Figure 8 The workspace analysis diagram is formed based on this.

[0131] The device has four moving parts, which are connected by four pins (cylindrical pins and locating pins), one sliding pair, and one gear pair. The overall degree of freedom is 3*4-2*5-1=1, ensuring that the support 13 can only move in the direction of extension and retraction perpendicular to the linear spring 14.

[0132] In practical applications, this device operates as follows: Figure 9As shown in the diagram of states AB, the area near A represents the initial working state. At this point, the pressure exerted by the mechanism on the tank wall is relatively low. By adjusting the stiffness of the linear spring 14 and the length of the connecting rod, a reasonable sealing pressure is applied to the tank wall by the gear connecting rod. When the tank wall deforms outward, the gear connecting rod mechanism extends, and the working state gradually shifts towards point B. Throughout the transition from state A to state B, the sealing pressure on the tank wall remains above the AB line. That is, although the tank wall deforms outward, the sealing pressure does not decrease, thus achieving a good seal.

[0133] During installation, the self-compensation mechanism is initially set to operate near state A. The elastic force of the metal spring 12 is adjusted to be equal to the thrust of the self-compensation mechanism Fy. When the tank wall deforms outward, the elastic force of the metal spring 12 decreases, and at this time Fy is greater than the elastic force of the metal spring 12.

[0134] As the self-compensating mechanism transitions from state A to state B, Fy increases, compressing the metal spring 12 and increasing its elastic force until equilibrium is restored. At this point, the self-compensating mechanism is in a state between A and B, and the sealing pressure is obviously greater than the initial sealing pressure. That is, although the tank wall deforms outward, the sealing pressure of the floating roof sealing ring does not decrease due to the presence of the sealing structure, and the sealing effect is unaffected.

[0135] Preferably, such as Figure 9 As shown, as y gradually decreases, the pressure Fy exerted by the self-compensating mechanism on the tank wall first increases and then decreases. The portion above the straight line AB is the working range of the mechanical self-compensating floating roof sealing unit 100. Therefore, the process ends when the device is pressurized and moves from point C to point A. At this point, if the floating roof tank wall deforms outward, y increases. That is, from point A to point B, even with outward deformation of the tank wall, the sealing pressure of the mechanical self-compensating floating roof sealing unit 100 does not decrease, and the sealing pressure value remains above the straight line AB. Therefore, the problem of decreased sealing pressure during tank wall deformation is solved.

[0136] Compared with existing technologies, the advantages of this invention are:

[0137] Firstly, this device can convert the linear force of the linear spring 14 into a nonlinear longitudinal force, so that the mechanical self-compensating floating roof sealing unit 100 can more easily adapt to the deformation of the tank wall, thereby improving the sealing effect of the floating roof.

[0138] In addition, this device can achieve self-compensation of the sealing pressure between the metal spring 12 and the tank wall through the gear connecting rod spring mechanism, thereby adapting to the deformation of the floating roof tank and further improving the sealing effect of the floating roof edge to prevent VOCs volatilization, thereby improving the function of floating roof oil and gas treatment.

[0139] In addition, when the tank wall deforms, the mechanical self-compensating floating roof sealing unit can compensate for the sealing pressure between the metal spring 12 and the tank wall, so as to change the situation where the sealing effect of the deformed metal spring 12 deteriorates.

[0140] Secondly, this invention can assemble multiple mechanical self-compensating floating roof sealing units 100 into a complete disc-shaped structure, thereby enhancing the sealing performance of the storage tank, solving the safety hazards and VOCs volatilization problems, and further suppressing oil volatilization and VOCs emission reduction from the source.

[0141] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A mechanical self-compensating floating disc sealing unit, comprising: a support plate (11) provided with a metal spring (12) for contact with a wall surface of a storage tank at a side end of the support plate (11), a self-compensation mechanism comprising a guide rail (20) arranged opposite to the support plate (11), and a driving member arranged between the support plate (11) and the guide rail (20), the driving member being configured to compensate for sealing pressure when the metal spring (12) deforms with the wall surface of the storage tank. The driving member comprises two support seats (13) arranged at intervals on an inner wall of the support plate (11), and a first gear rotating rod (31) and a second gear rotating rod (32) respectively rotatably connected to the two support seats (13). A circular hole is provided at a first end of the guide rail (20), and a fixed end of the first gear rotating rod (31) is fixedly connected to the circular hole through a first cylindrical pin (311) to be fixedly installed on the guide rail (20). A sliding groove (21) is provided at a second end of the guide rail (20), and a sliding block (22) is arranged in the sliding groove (21), and a fixed end of the second gear rotating rod (32) is fixedly connected to the sliding block (22) through a second cylindrical pin (321).

2. The mechanical self-compensating float seal unit of claim 1, wherein, The self-compensation mechanism further comprises a linear spring (14) arranged below the guide rail (20) and connected to the first cylindrical pin (311) and the second cylindrical pin (321) respectively, 3. The mechanical self-compensating float seal unit of claim 2, wherein, wherein when the metal spring (12) deforms outwardly with the wall surface of the storage tank, the linear spring (14) contracts inwardly to drive the second cylindrical pin (321) and the sliding block (22) to slide transversely in the sliding groove (21), so that the support plate (11) moves forward and presses the metal spring (12) to rebalance.

4. The mechanical self-compensating float seal unit of claim 3, wherein, The free ends of the first gear rotating rod (31) and the second gear rotating rod (32) are meshingly connected.

5. The mechanical self-compensating float seal unit of claim 4, wherein, The support plate (11) is configured in an arc-shaped structure, and the metal spring (12) is fixed to the support plate (11) by bolts. The self-compensation mechanism further comprises a floating disc upper plate (15) arranged below the guide rail (20), and edge reinforcing ribs (16) arranged on the floating disc upper plate (15).

6. The mechanical self-compensating float seal unit of claim 5, wherein, A plurality of the edge reinforcing ribs (16) are arranged at intervals along a length direction of the floating disc upper plate (15).

7. The mechanical self-compensating float seal unit of claim 1, wherein, The self-compensation mechanism further comprises an L-shaped support plate (17) arranged outside the floating disc upper plate (15), and a limiting groove (171) is formed in the L-shaped support plate (17) for accommodating the guide rail (20).

8. The mechanical self-compensating float seal unit of claim 1, wherein, A sealing diaphragm (18) is arranged between the L-shaped support plate (17) and the support plate (11), and the sealing diaphragm (18) is fixed to the L-shaped support plate (17) and the support plate (11) by bolts.

9. The mechanically self-compensating float seal unit of claim 8, wherein, 12. A floating disc device configured in a disc-shaped form, comprising a plurality of the mechanical self-compensating floating disc sealing units according to any one of claims 1 to 11 arranged continuously in a circumferential direction in a storage tank.

10. The mechanically self-compensating float seal unit of claim 9, wherein, ​ 11. The mechanically self-compensating float seal unit of claim 10, wherein, ​ ​

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