Manhole sealing device for boiler drum

Abstract

A manhole sealing device for a boiler drum comprises a sealing door and a sealing cover which are sequentially arranged from inside to outside, the sealing cover is connected with the sealing door through a plurality of connecting bolts, an annular gasket is arranged between the sealing door and the sealing cover, the annular gasket is arranged on an annular boss of a manhole door seat, and the annular gasket is attached to the surface of the sealing cover. The annular gasket comprises a plurality of first cushion blocks, second cushion blocks are connected between the adjacent first cushion blocks, the compression resistance of the second cushion blocks is larger than that of the first cushion blocks, and the second cushion blocks are close to the connecting bolts. The sealing effect is prevented from being affected by local damage of the annular gasket.

Description

Technical Field

[0001] This utility model relates to the field of boiler drum technology, specifically a manhole sealing device for boiler drums. Background Technology

[0002] The steam drum is a key component of a boiler system, primarily used to store water and steam and to achieve steam-water separation during boiler operation. It is typically located at the top of the boiler and must withstand a high-temperature, high-pressure working environment. The manhole is an important opening on the steam drum, its main function being to facilitate personnel access for inspection, cleaning, and maintenance, ensuring the safe operation of the boiler. Simultaneously, during boiler manufacturing and installation, the manhole also facilitates the installation and disassembly of internal equipment.

[0003] To ensure a tight seal between the manhole cover and the steam drum, preventing steam and water leakage, a metal or graphite spiral wound gasket is typically installed inside the manhole. The manhole cover and gland are then secured together with several bolts. However, both the diameter of the metal and graphite spiral wound gaskets are larger than the manhole opening, requiring some deformation for installation. Careless installation can easily damage these gaskets, affecting the sealing performance. After experimentation, the applicant opted for copper gaskets, which soften upon heating during installation, making them easier to install. However, since the manhole cover and gland are connected by bolts, uneven tightening of the bolts can easily cause uneven stress on the gaskets, leading to localized damage and compromising the sealing effect. Utility Model Content

[0004] To address the problem of uneven stress and localized damage caused by existing copper gaskets, this invention provides a manhole sealing device for boiler drums, preventing localized damage to the gasket from affecting the sealing effect.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a manhole sealing device for a boiler drum, comprising a sealing door and a cover arranged sequentially from the inside to the outside, the cover being connected to the sealing door by multiple connecting bolts, an annular gasket being provided between the sealing door and the cover, the annular gasket being provided on the annular protrusion of the manhole door seat, and the annular gasket being in contact with the surface of the cover, the annular gasket comprising a plurality of first pads, with a second pad connecting adjacent first pads, the second pad having a compressive strength greater than that of the first pad, and the second pad being close to the connecting bolts.

[0006] As a further optimization of the manhole sealing device for boiler drum, the first pad is provided with a dovetail groove at its end, and the second pad is provided with a dovetail block at its end, and the dovetail blocks can be inserted into the dovetail grooves one by one.

[0007] As a further optimization of the manhole sealing device for boiler drum, the first pad is integrally connected to an extension plate at its end, and the second pad includes a first U-shaped part and a second U-shaped part. After the first U-shaped part and the second U-shaped part are connected, they enclose a space that can accommodate the two extension plates.

[0008] As a further optimization of the manhole sealing device for boiler drum, the two sides of the first U-shaped part are integrally connected with a docking plate, and the two sides of the second U-shaped part are provided with docking grooves for the docking plate to enter.

[0009] As a further optimization of the manhole sealing device for boiler drum, the outer surface of the sealing door is provided with a plurality of bolt seats, and the bolt seats are provided with screw holes that cooperate with the connecting bolts.

[0010] As a further optimization of the manhole sealing device for boiler drum, the bolt seats are evenly distributed on the surface of the sealing door along the circumferential direction of the sealing door.

[0011] As a further optimization of the manhole sealing device for boiler drum, the sealing door is provided with an inclined surface that cooperates with the manhole door seat.

[0012] As a further optimization of the manhole sealing device for boiler drum, a handle is provided on the outer surface of the sealing door.

[0013] As a further optimization of the manhole sealing device for boiler drum, the cover has a channel through which the handle is exposed.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention improves the annular gasket by incorporating several first gasket blocks connected to adjacent first gasket blocks by second gasket blocks. The second gasket blocks have greater compressive strength than the first gasket blocks. To prevent uneven stress on the gasket caused by inconsistent tightening of the connecting bolts when connecting the cover to the sealing door, which could lead to localized damage to the annular gasket, the second gasket blocks closer to the connecting bolts have better compressive strength than the first gasket blocks. This effectively resists localized high stress caused by uneven tightening of the connecting bolts, thereby reducing the risk of damage. This not only protects the second gasket blocks themselves but also prevents localized damage to the first gasket blocks, ensuring an overall sealing effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the fit between the cover and the sealing door;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model;

[0018] Figure 3 This is a schematic diagram of a ring-shaped gasket;

[0019] Figure 4 This is a schematic diagram of one embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of another embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram showing the fit between the extension plate, the first U-shaped section, and the second U-shaped section;

[0022] Figure 7 This is a schematic diagram showing the fit between the sealing door, bolt seat, and handle;

[0023] The markings in the diagram are: 1. Manhole seat, 2. Sealing door, 3. Cover, 4. Connecting bolt, 5. Handle, 6. Bolt seat, 7. Screw hole, 8. Annular gasket, 9. Through hole, 10. Annular boss, 11. First pad, 12. Second pad, 13. Dovetail block, 14. Dovetail groove, 15. First U-shaped part, 16. Second U-shaped part, 17. Extension plate, 18. Butt plate. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of this utility model should be understood as prior art known or should be known by those skilled in the art, such as the structure of the boiler drum, the structure and material of the manhole seat 1, and how the sealing door 2 is connected to the boiler drum, etc.

[0025] Example 1

[0026] A manhole sealing device for boiler drums, such as Figures 1 to 3As shown, the structure includes a sealing door 2 and a cover 3 arranged sequentially from the inside to the outside, where "from the inside to the outside" refers to the boiler drum. The cover 3 is connected to the sealing door 2 by multiple connecting bolts 4. An annular gasket 8 is provided between the sealing door 2 and the cover 3. The annular gasket 8 is set on the annular boss 10 of the manhole door seat 1, and the annular gasket 8 is in contact with the surface of the cover 3. The annular gasket 8 includes several first pads 11, which are made of copper. A second pad 12 is connected between adjacent first pads 11. The compressive strength of the second pad 12 is greater than that of the first pad 11. The first pads 11 and the second pads 12 are flush. The second pad 12 is made of brass. To prevent uneven stress on the annular gasket 8 due to different tightening forces of different bolts when connecting the cover 3 to the sealing door 2 via the connecting bolts 4, which could lead to localized damage to the annular gasket 8, the second pad 12 is located close to the connecting bolts 4. The second pad 12, being closer to the connecting bolts 4, has better compressive strength than the first pad 11 and is less prone to damage. This also prevents localized damage to the first pad 11, ensuring a good seal. The first pad 11, made of copper, is slightly thicker than the second pad 12, made of brass. When the first pad 11 is deformed under pressure, it can eliminate the gap between the first pad 11 and the second pad 12, enhancing the sealing effect of the annular gasket 8.

[0027] To facilitate the connection of the cover 3 and the sealing door 2 with connecting bolts 4, multiple bolt seats 6 are provided on the outer surface of the sealing door 2. Each bolt seat 6 has a threaded hole 7 that mates with the connecting bolts 4. In this embodiment, three bolt seats 6 are provided, each with a corresponding bolt hole. The cover 3 has a through hole 9 corresponding to the bolt hole, allowing the operator to quickly align the threaded hole 7 on the cover 3 with the bolt seat 6 on the sealing door 2 during installation. The bolt seats 6 are evenly distributed along the circumference of the sealing door 2, ensuring uniform force on the annular gasket 8. These three bolt seats 6 are arranged in a triangular pattern, ensuring a good connection while avoiding excessive connecting bolts 4 that would complicate the connection process and prevent uneven force distribution on the annular gasket 8. To ensure proper fit between the sealing door 2 and the manhole seat 1 and enhance the stability of the sealing door 2, a bevel is provided on the sealing door 2 to mate with the manhole seat 1. A handle 5 is provided on the outer surface of the sealing door 2 for easy opening and closing. After the sealing door 2 and the annular gasket 8 are set up, the cover 3 will be connected to the sealing door 2 by the connecting bolt 4. The cover 3 has a channel through which the handle 5 is exposed.

[0028] The above are the basic embodiments of this utility model. Further improvements, optimizations, and limitations can be made based on the above to obtain the following embodiments:

[0029] Example 2

[0030] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 4 As shown, in order to facilitate the connection between the first pad 11 and the second pad 12, the end of the first pad 11 is provided with a dovetail groove 14, and the end of the second pad 12 is provided with a dovetail block 13. The dovetail blocks 13 can be inserted into the dovetail groove 14 one by one.

[0031] In this embodiment, three second pads 12 are provided. Before installing the annular gasket 8, the second pads 12 are spliced ​​and combined with the first pads 11 to form the required annular gasket 8. Among them, the second pads 12 with dovetail blocks 13 are close to the positions of the connecting bolts 4. When the cover 3 and the sealing door 2 are connected and fixed by the connecting bolts 4, even if the tightening force of the connecting bolts 4 at different positions is different, resulting in uneven pressure on the second pads 12, since the compressive strength of the second pads 12 is better than that of the first pads 11, it can effectively protect the first pads 11 from damage and also ensure that the second pads 12 themselves are not damaged.

[0032] Example 3

[0033] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 5 and Figure 6 As shown, an extension plate 17 is integrally connected to the end of the first pad 11. The extension plate 17 is located in the middle of the end of the first pad 11. The second pad 12 includes a first U-shaped portion 15 and a second U-shaped portion 16. After the first U-shaped portion 15 and the second U-shaped portion 16 are connected, they enclose a receiving space that can accommodate two extension plates 17. In this embodiment, three second pads 12 are provided. The inner side of the first U-shaped portion 15 and the inner side of the second U-shaped portion 16 can fit against the extension plates 17 to ensure tightness. A mating plate 18 is integrally connected to the two sides of the first U-shaped portion 15, and a mating groove is opened on the two sides of the second U-shaped portion 16 for the mating plate 18 to enter. Before installing the annular gasket 8, the first U-shaped portion 15 and the second U-shaped portion 16 are mated together so that they are flush with the first pad 11. At this time, the two extension plates 17 of the adjacent first pad 11 are located in the receiving space, and the first U-shaped portion 15 and the second U-shaped portion 16 wrap around the two extension plates 17 to form a protective structure. When the cover 3 is connected and fixed to the sealing door 2 by the connecting bolts 4, even if the tightening force of the connecting bolts 4 at different positions is different, resulting in uneven pressure on the second pad 12 wrapped on the first pad 11, since the pressure resistance of the second pad 12 is better than that of the first pad 11, it can effectively protect the first pad 11 from damage and also ensure that the second pad 12 itself is not damaged, thereby ensuring the stability and reliability of the entire sealing structure.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A manhole sealing device for a boiler drum, characterized in that: The enclosure includes a sealing door (2) and a cover (3) arranged sequentially from the inside to the outside. The cover (3) is connected to the sealing door (2) by multiple connecting bolts (4). An annular gasket (8) is provided between the sealing door (2) and the cover (3). The annular gasket (8) is provided on the annular boss (10) of the manhole door seat (1), and the annular gasket (8) is in contact with the surface of the cover (3). The annular gasket (8) includes several first pads (11). A second pad (12) is connected between adjacent first pads (11). The compressive strength of the second pad (12) is greater than that of the first pad (11). The second pad (12) is close to the connecting bolts (4).

2. The manhole sealing device for a boiler drum as described in claim 1, characterized in that: The first pad (11) has a dovetail groove (14) at its end, and the second pad (12) has a dovetail block (13) at its end. The dovetail blocks (13) can be inserted into the dovetail groove (14) one by one.

3. The manhole sealing device for a boiler drum as described in claim 1, characterized in that: The first pad (11) has an extension plate (17) integrally connected to its end. The second pad (12) includes a first U-shaped part (15) and a second U-shaped part (16). The first U-shaped part (15) and the second U-shaped part (16) are connected to form a space that can accommodate the two extension plates (17).

4. The manhole sealing device for a boiler drum as described in claim 3, characterized in that: The first U-shaped part (15) has a docking plate (18) integrally connected to its two sides, and the second U-shaped part (16) has docking grooves on its two sides for the docking plate (18) to enter.

5. The manhole sealing device for a boiler drum as described in claim 1, characterized in that: The outer surface of the sealing door (2) is provided with a plurality of bolt seats (6), and the bolt seats (6) are provided with screw holes (7) that cooperate with the connecting bolts (4).

6. The manhole sealing device for a boiler drum as described in claim 5, characterized in that: The bolt seats (6) are evenly distributed on the surface of the sealing door (2) along the circumferential direction.

7. The manhole sealing device for a boiler drum as described in claim 1, characterized in that: The sealing door (2) is provided with an inclined surface that cooperates with the manhole door seat (1).

8. The manhole sealing device for a boiler drum as described in claim 1, characterized in that: A handle (5) is provided on the outer surface of the sealed door (2).

9. The manhole sealing device for a boiler drum as described in claim 8, characterized in that: The cover (3) has a channel, through which the handle (5) is exposed.

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