Mechanical sealing structure

Abstract

The utility model relates to a mechanical sealing structure which comprises a floating disc connecting plate, a sealing structure is installed on the floating disc connecting plate, and the sealing structure is composed of a first spring plate, a stainless steel plate, a sealing plate, a second spring plate, a baffle and a filler strip. One side of a first spring plate, one side of a second spring plate, one side of a sealing plate, one side of a stainless steel plate, one side of a baffle and one side of a filler strip are overlapped and connected with a floating disc connecting plate through bolts, the first spring plate is inserted into the floating disc connecting plate, the filler strip is further arranged at the lower end of the floating disc connecting plate, and the filler strip and a sealing structure are fixed to the floating disc connecting plate through bolts. A gasket is further arranged at the overlapped position of the first spring plate, the second spring plate and the sealing plate, a baffle used for fastening is arranged on the upper surface of the stainless steel plate located on the outer layer, and the sealing structure is completely immersed in liquid. The sealing structure solves the problems that an existing sealing structure applied to the floating disc cannot adapt to the welding seam requirement of the tank wall, so that adaptability is reduced, the sealing effect is poor, and potential safety hazards are likely to be generated.

Description

Technical Field

[0001] This utility model relates to the field of floating roof sealing structure technology, specifically a mechanical seal structure. Background Technology

[0002] A floating roof, also known as a floating top plate, is an important component of the top of a storage tank and is commonly found in storage tank equipment such as oil tanks and liquid tanks.

[0003] The floating roof sealing structure is a sealing device between the floating roof and the tank wall. Its function is to float up and down with the rise and fall of the liquid level in the storage tank to maintain the airtightness of the tank space and prevent the evaporation of the medium and the entry of external pollutants.

[0004] Common sealing structures include double seals (bladder + tongue type) and liquid-immersed bladder + tongue type seals, for example, with... Figure 7 and 8 All are existing technologies with a double seal of bladder type + tongue type, and their attachments Figure 6 The attached diagram illustrates the existing liquid-immersed bladder-type + tongue-type double seal technology. Figure 7 For example, because the capsule is positioned at the top and is sealed below by a tongue-shaped sealing tape that does not contact the stored medium, oil will not enter even if the capsule sealing tape is scratched, thus not hindering normal use. However, this method still has certain drawbacks. The drawback is that the tongue-shaped seal at the bottom creates a large oil and gas space between the seal and the liquid surface, which theoretically poses a certain safety hazard, for example, as shown in the attached image. Figure 8 For example, a combination with a bladder seal at the bottom and a tongue seal at the top requires high-quality welds on the tank wall, ensuring they are smooth and do not scratch the skin. The advantage is a good seal, significantly reducing the oil-gas space between the bladder and the liquid surface. The disadvantage is that if the bladder seal tape is torn, oil can easily seep in, causing the bladder seal tape to fail. Existing technology uses a liquid-immersed bladder seal + tongue seal (see attached...). Figure 6 For example, the liquid-immersed bladder + tongue double seal, this type of seal is based on the ordinary bladder + tongue double seal (see attached). Figure 8 Based on this, upper and lower support plates and upper limit plates are added to the lower bladder-type sealing tape. At the same time, at least 50mm of the bladder-type sealing tape is immersed below the liquid surface during operation, and it will not flip up during operation. The advantages are that there is no oil and gas space, the sealing support is in place, and the sealing performance is more efficient. The disadvantage is that it requires higher requirements for the tank wall welds.

[0005] Therefore, in order to achieve the advantages of the sealing structure in the prior art while solving its drawbacks, and to prevent the occurrence of safety hazards, increase the sealing effect, and adapt to the unevenness of the tank wall welds, a mechanical seal structure is proposed to solve the technical problems existing in the prior art. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a mechanical seal structure that solves the problems of existing sealing structures used in floating roofs being unable to adapt to the requirements of tank wall welds, thus reducing adaptability, and having poor sealing effects, which can easily lead to safety hazards.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a mechanical seal structure, including a floating disc connecting plate, on which a sealing structure is installed. The sealing structure consists of a first spring plate, a stainless steel plate, a sealing plate, a second spring plate, a baffle, and a gasket. The first spring plate, the second spring plate, the sealing plate, the stainless steel plate, the baffle, and the gasket are stacked on one side and connected to the floating disc connecting plate by bolts. The first spring plate is inserted into the floating disc connecting plate. A gasket is also provided at the lower end of the floating disc connecting plate. The gasket is fixed to the floating disc connecting plate together with the sealing structure by bolts. A gasket is also provided at the overlapping part of the first spring plate, the second spring plate, and the sealing plate. A baffle for fastening is provided on the upper surface of the outer stainless steel plate. The sealing structure is completely immersed in liquid.

[0008] Furthermore, through the above technical solution, the first spring plate is bent downwards in a curved shape, and the lower end of the first spring plate is inclined outwards.

[0009] Furthermore, the stainless steel plate is provided in two sets, and each set of stainless steel plates is bent downwards and bent upwards in a hook shape at the lower end of the stainless steel plate, with the outer side of the stainless steel plate in contact with the inner wall of the floating plate.

[0010] As a preferred technical solution, the second spring plate is bent downward and inclined outward at its lower end, with its inclined end face engaging with the bend at the lower end of the stainless steel plate.

[0011] Furthermore, an inward pressure is applied to the surface of the second spring plate at the middle of the first spring plate.

[0012] As a preferred technical solution, the sealing plate is located between the two sets of stainless steel plates and is bent downwards. The lower end of the sealing plate is inclined outwards, and this inclination is on the inner side of the hook-shaped bend of the stainless steel plate.

[0013] Compared with the prior art, the present invention provides a mechanical seal structure with the following advantages:

[0014] 1. This sealing structure consists of a first spring plate, a second spring plate, a sealing plate, a stainless steel plate, a baffle, and a gasket stacked on one side and connected to the floating roof connecting plate with bolts, making its construction relatively simple and saving construction time.

[0015] 2. Through the action of the first spring plate and the second spring plate, the stainless steel plate and the sealing plate apply pressure to the tank wall, thereby improving the sealing performance.

[0016] 3. According to the standard, the bladder seal needs to be removed when cleaning the tank. The oil and gas inside the sponge cannot evaporate, which will cause extremely high safety hazards. Using mechanical shoe-type seals eliminates the space for oil and gas storage and ensures safety.

[0017] 4. The mechanical shoe seal is made of stainless steel and is completely immersed in the liquid in the tank. This avoids the need for specific materials for bladder-type tapes depending on the media requirements. If the media in the tank is frequently changed, the mechanical shoe seal can be used for any media. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the second spring plate structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the first spring plate structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the floating roof connecting plate structure of this utility model;

[0022] Figure 5 This utility model Figure 3 A magnified schematic diagram of the structure at point A;

[0023] Figure 6 This is a schematic diagram of an existing liquid-immersed bladder-type sealing structure with a tongue-shaped seal.

[0024] Figure 7 This is a schematic diagram of an existing liquid-immersed bladder-type sealing structure with a tongue-shaped seal.

[0025] Figure 8 This is a schematic diagram of an existing liquid-immersed bladder-type sealing structure with a tongue-shaped seal.

[0026] Figure 1-5 In the middle: 1. Floating roof connecting plate; 2. First spring plate; 3. Stainless steel plate; 4. Sealing plate; 5. Second spring plate; 6. Baffle plate; 7. Gasket strip;

[0027] Figure 6 In the middle: A1, tank wall; A2, tongue-shaped sealing bag; A3, sealed bag tape;

[0028] Figure 7 Chinese: B1, sealed bag; B2, tongue-shaped sealed bag;

[0029] Figure 8 C1, tongue-shaped sealed bag; C2, solid sealed bag. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example

[0032] Please see Figure 1-8 The present invention provides the following technical solution: a mechanical seal structure, including a floating plate connecting plate 1, on which a sealing structure is installed. The sealing structure consists of a first spring plate 2, a stainless steel plate 3, a sealing plate 4, a second spring plate 5, a baffle 6, and a gasket 7. The first spring plate 2, the second spring plate 5, the sealing plate 4, the stainless steel plate 3, the baffle 6, and the gasket 7 are stacked on one side and connected to the floating plate connecting plate 1 by bolts. The first spring plate 2 is inserted into the floating plate connecting plate 1. A gasket 7 is also provided at the lower end of the floating plate connecting plate 1. The gasket 7 is fixed to the floating plate connecting plate 1 together with the sealing structure by bolts. A gasket is also provided at the overlapping part of the first spring plate 2, the second spring plate 5, and the sealing plate 4. A baffle 6 for fastening is provided on the upper surface of the outer stainless steel plate 3. The sealing structure is completely immersed in liquid.

[0033] In this implementation plan, the specific working principle is as follows: A sealing structure is installed on the floating roof. The first spring plate 2 and the second spring plate 5 apply pressure to the stainless steel plate 3 and the sealing plate 4, thereby improving the sealing effect. Furthermore, the first spring plate 2, the second spring plate 5, the sealing plate 4, the stainless steel plate 3, the baffle 6, and the gasket 7 are stacked on one side and connected to the floating roof connecting plate 1 with bolts. This facilitates construction and significantly shortens construction time. Since the sealing structure is completely immersed in the liquid, it avoids the need for specific materials in bladder-type tapes depending on the medium requirements. For example, if the medium in the tank is frequently changed, the mechanical shoe seal can be used with any medium, improving adaptability. It also avoids the problem of poor oil and gas evaporation, which could cause significant safety hazards in existing technologies, thus improving the safety of the sealing structure.

[0034] To achieve the elastic force of the double spring plates and increase the pressure applied to the stainless steel plate 3, please refer to [the relevant documentation]. Figure 2 As can be seen, the first spring plate 2 is bent downwards and is located at the lower end of the first spring plate 2, which is inclined outwards. The first spring plate 2 is in contact with the second spring plate 5. Therefore, the elastic force generated by the first spring plate 2 and the elastic force generated by the second spring plate 5 together seal the stainless steel plate 3 and the sealing plate 4 on the surface of the tank wall, further improving the sealing effect.

[0035] To prevent damage to the sealing structure due to uneven weld seams on the tank wall, please refer to the following for details. Figure 5 As can be seen, there are two sets of stainless steel plates 3, and each set of stainless steel plates 3 is bent downwards and bent upwards in a hook shape at the lower end of the stainless steel plate 3. The outer side of the stainless steel plate 3 contacts the inner wall of the floating plate. Through the bending action, the unevenness of the weld seam can be effectively prevented from damaging the sealing structure, regardless of whether it moves up or down.

[0036] To effectively increase the pressure applied to stainless steel plate 3, please refer to the following: Figure 2 As can be seen, the second spring plate 5 is bent downwards and tilted outwards at its lower end. Its tilted end face is engaged with the bend at the lower end of the stainless steel plate 3. The second spring plate 5 is in contact with the bend of the stainless steel plate 3. This ensures that the elastic effect is applied to the bend and effectively improves the sealing effect.

[0037] In order to effectively transfer the elastic force of the first spring plate 2 to the second spring plate 5, please refer to the following for details. Figure 2 It can be seen that the middle of the first spring plate 2 applies inward pressure to the surface of the second spring plate 5.

[0038] To improve the stability of the stainless steel plate 3 seal, please refer to [the relevant documentation]. Figure 2 As can be seen, the sealing plate 4 is located in the middle of the two sets of stainless steel plates 3 and bends downward. The lower end of the sealing plate 4 is inclined outward, and this inclination is on the inner side of the hook-shaped bend of the stainless steel plate 3. If the stainless steel plate 3 is a whole, it is easy for the stainless steel plate 3 to be stressed and deformed due to the large contact surface. Therefore, the stainless steel plate 3 is divided into two groups, and the two groups of stainless steel plates 3 are connected by the sealing plate 4. This solves the problem that the stainless steel plate 3 is not easy to deform. In addition, the lower end of the sealing plate 4 is the bend of the top column, so it can provide support for the stainless steel plate 3 when it is descending.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mechanical seal structure, comprising a floating disc connecting plate (1), characterized in that: A sealing structure is installed on the floating dock connecting plate (1). The sealing structure consists of a first spring plate (2), a stainless steel plate (3), a sealing plate (4), a second spring plate (5), a baffle (6), and a gasket (7). The first spring plate (2), the second spring plate (5), the sealing plate (4), the stainless steel plate (3), the baffle (6), and the gasket (7) are stacked on one side and connected to the floating dock connecting plate (1) by bolts. The first spring plate (2) is inserted into the floating dock connecting plate (1). A gasket (7) is also provided at the lower end of the floating dock connecting plate (1). The gasket (7) is fixed to the floating dock connecting plate (1) together with the sealing structure by bolts. A gasket is also provided at the overlapping part of the first spring plate (2), the second spring plate (5), and the sealing plate (4). A baffle (6) for fastening is provided on the upper surface of the outer stainless steel plate (3). The sealing structure is completely immersed in the liquid.

2. The mechanical seal structure according to claim 1, characterized in that: The first spring plate (2) is bent downwards and is located at the lower end of the first spring plate (2) and is inclined outwards.

3. The mechanical seal structure according to claim 1, characterized in that: The stainless steel plate (3) is provided in two sets, and each set of stainless steel plate (3) is bent downwards and bent upwards in a hook shape at the lower end of the stainless steel plate (3), with the outer side of the stainless steel plate (3) in contact with the inner wall of the floating plate.

4. The mechanical seal structure according to claim 1, characterized in that: The second spring plate (5) is bent downward and tilted outward at the lower end of the second spring plate (5), and its tilted end face is stuck at the bend at the lower end of the stainless steel plate (3).

5. The mechanical seal structure according to claim 1, characterized in that: The first spring plate (2) applies inward pressure to the surface of the second spring plate (5) at the middle.

6. The mechanical seal structure according to claim 1, characterized in that: The sealing plate (4) is located in the middle of the two sets of stainless steel plates (3) and is bent downwards. The lower end of the sealing plate (4) is inclined outwards, and the inclination is on the inside of the hook-shaped bend of the stainless steel plate (3).

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