Quick-open type coal-fired unit boiler manhole door sealing structure and using method thereof

Abstract

The invention discloses a quick-open type coal-fired unit boiler manhole door sealing structure and a using method thereof, and relates to the technical field of manhole door sealing. Comprising a flange, the top end of the flange is rotationally connected with a manhole door, a connecting piece is fixed to the bottom end of the manhole door, a plurality of limiting openings are formed in the connecting piece, a first limiting piece is arranged in the flange and comprises a plurality of fixing sleeves fixed to the inner wall of the flange, the fixing sleeves correspond to the limiting openings in a one-to-one mode, and heat-sensitive elastomers are fixed in the fixing sleeves. By arranging the first limiting piece, when the temperature in a boiler rises, a heat-sensitive elastomer expands to drive a moving block to move forwards, the moving block moves to drive a limiting rod to move, the limiting rod is inserted into a limiting opening, and a connecting piece at the bottom end of the manhole door is fixed; the top end and the bottom end of the manhole door are fixed through the first limiting piece and the second limiting piece, and the manhole door, the flange and an external fixing device are prevented from loosening due to the high-temperature and high-pressure environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manhole door sealing, in particular to a quick-opening type coal-fired unit boiler manhole door sealing structure and a use method thereof. BACKGROUND

[0002] During the operation of the coal-fired unit, the boiler needs to be regularly overhauled, maintained and cleaned. The manhole door, as a passageway for the operator to enter and exit the inside of the boiler, is crucial in terms of sealing performance and opening convenience. The existing boiler manhole door connecting device (publication number: CN209726256U) has the following shortcomings in use: The existing coal-fired unit boiler manhole door sealing structure has poor sealing effect. Since it only relies on external fixation, the high-temperature and high-pressure environment during the operation of the boiler can easily cause the manhole door, flange and external fixation device to loosen. This causes a gap between the manhole door and the flange, which in turn causes leakage. This not only causes energy waste, but also poses a threat to the safety of surrounding equipment and personnel, thereby reducing the sealing performance. Therefore, the present application proposes a quick-opening type coal-fired unit boiler manhole door sealing structure and a use method thereof to solve the above problems. SUMMARY

[0003] The present application aims to provide a quick-opening type coal-fired unit boiler manhole door sealing structure and a use method thereof to solve the problems raised in the background.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solution: a quick-opening type coal-fired unit boiler manhole door sealing structure, comprising a flange, the top end of the flange being rotationally connected with a manhole door, the bottom end of the manhole door being fixed with a connecting piece, a plurality of limiting openings being formed in the connecting piece, a first limiting piece being arranged in the flange, the first limiting piece comprising a plurality of fixed sleeves fixed to the inner wall of the flange, the fixed sleeves corresponding one-to-one to the limiting openings, a heat-sensitive elastic body being fixed in the fixed sleeve, a moving block being slidably connected in the fixed sleeve, the heat-sensitive elastic body being fixed to the moving block, a limiting rod being fixed to one side of the moving block, the limiting rod penetrating through the fixed sleeve and being inserted into the limiting opening, a spring being fixed between the moving block and the inner wall of the fixed sleeve.

[0005] Preferably, the top end of the flange is provided with a second limiting piece, the second limiting piece comprising a cover rod rotationally connected to the top end of the flange, a plurality of moving grooves being formed in the inside of the cover rod, a moving plate being slidably connected in the moving grooves, a plug being fixed to the bottom end of the moving plate, a plurality of connecting blocks corresponding one-to-one to the plug being fixed to the outer wall of the manhole door, an insertion slot being formed in the top end of the connecting block, the plug penetrating through the cover rod and being inserted into the insertion slot.

[0006] Preferably, the second limiting piece further comprises a plurality of screw rods screwed to the top end of the cover rod, the screw rods corresponding one-to-one to the moving plates, the bottom end of the screw rod being rotationally connected to the moving plate in the moving groove.

[0007] Preferably, the top end of the flange is fixed with a first fixing part, the end of the first fixing part is rotatably connected with a first rotating rod, and the first rotating rod is fixed with the manhole door.

[0008] Preferably, the top end of the flange is fixed with a second fixing part, the end of the second fixing part is rotatably connected with a second rotating rod, and the second rotating rod is fixed with the cover rod.

[0009] Preferably, the cover rod is fixed with a connecting rod, and the bottom end of the connecting rod is in contact with the top end of the manhole door.

[0010] Preferably, the bottom end of the manhole door is fixed with a sealing gasket, and the sealing gasket is tightly attached to the inner wall of the flange.

[0011] Preferably, the top end of the flange is provided with a plurality of mounting holes.

[0012] Preferably, the cover rod and the connecting rod form a mouth-shaped structure, and the connecting part is located on the inner side of the sealing gasket.

[0013] A use method of a quick-opening type boiler manhole door sealing structure of a coal-fired unit, comprising the following steps: S1: first, the manhole door is covered, so that the sealing gasket is inserted into the flange; S2: then the cover rod is rotated above the manhole door, the rotating screw is rotated, the screw drives the moving plate to move downward, the moving plate drives the insertion block to be inserted into the insertion slot to realize limiting, and the manhole door is fixed; S3: when the temperature in the boiler rises, the heat-sensitive elastic body expands to drive the moving block to move forward, the moving block moves to drive the limiting rod to move, so that the limiting rod is inserted into the limiting port to fix the connecting part at the bottom end of the manhole door; S4: when the boiler stops working and the temperature decreases, the heat-sensitive elastic body returns to the original position, the spring and the heat-sensitive elastic body drive the limiting rod to return to the original position, and the connecting part is no longer limited and fixed; S5: when the boiler needs to be maintained, the screw is reversely rotated, the screw drives the moving plate to move upward, the moving plate drives the insertion block to move out of the insertion slot, then the cover rod is rotated away from the manhole door, and finally the manhole door is opened to maintain the boiler.

[0014] Compared with the prior art, the beneficial effects of the present application are: By setting the first limiting piece, when the temperature in the boiler rises, the heat-sensitive elastomer expands to drive the moving block to move forward, the moving block moves to drive the limiting rod to move, so that the limiting rod is inserted into the limiting opening to fix the connecting piece at the bottom end of the manhole door. The top and bottom of the manhole door are fixed by the first limiting piece and the second limiting piece, so as to avoid the loosening of the manhole door, flange and external fixing device caused by high temperature and high pressure environment. The gap between the manhole door and the flange is formed, which further causes leakage, which not only causes energy waste, but also threatens the safety of surrounding equipment and personnel.

[0015] At the same time, by covering the manhole door, the sealing gasket is inserted into the flange; then the cover rod is rotated above the manhole door, the rotating screw rod is rotated, the screw rod drives the moving plate to move downward, the moving plate moves downward to drive the insertion block to insert into the insertion slot to realize limiting, and the manhole door is fixed. When the boiler needs to be repaired, the screw rod is rotated in the opposite direction, the moving plate is driven upward, the insertion block is moved out of the insertion slot, then the cover rod is rotated away from the manhole door, and finally the manhole door is opened to repair the boiler. The boiler is closed and opened conveniently and quickly, and it is not necessary to install the bolts one by one between the manhole door and the flange and to remove them one by one later, so that the installation and opening efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a sectional view of the present application; Figure 3 It is a schematic diagram of the structure of the present application after removing the flange; Figure 4 It is a schematic diagram of the connecting block structure of the present application; Figure 5 It is a schematic diagram of the first limiting piece structure of the present application; Figure 6 It is a cover rod sectional view of the present application.

[0017] In the figure: 1, flange; 2, first fixing piece; 3, first rotating rod; 4, manhole door; 5, connecting block; 6, fixed sleeve; 7, heat-sensitive elastomer; 8, moving block; 9, limiting rod; 10, spring; 11, connecting piece; 12, limiting opening; 13, sealing gasket; 14, insertion slot; 15, second fixing piece; 16, second rotating rod; 17, cover rod; 18, connecting rod; 19, screw rod; 20, moving slot; 21, moving plate; 22, insertion block; 23, mounting hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0019] During the operation of the coal-fired unit, the boiler needs to be regularly overhauled, maintained and cleaned. The manhole door 4 is a passageway for the operator to enter and exit the inside of the boiler, and its sealing performance and opening convenience are crucial. The sealing structure of the existing manhole door of the boiler of the coal-fired unit has poor sealing effect. Since it only relies on external fixation, when the boiler is running, the high-temperature and high-pressure environment can easily cause the manhole door 4, the flange 1 and the external fixation device to loosen. This causes a gap between the manhole door 4 and the flange 1, and further causes leakage. This not only causes energy waste, but also poses a threat to the safety of surrounding equipment and personnel. The sealing structure of the quick-opening manhole door of the boiler of the coal-fired unit and the use method thereof can fix the top end and the bottom end of the manhole door 4, thereby avoiding the high-temperature and high-pressure environment causing the manhole door 4, the flange 1 and the external fixation device to loosen, causing a gap between the manhole door 4 and the flange 1, causing leakage, causing energy waste, and posing a threat to the safety of surrounding equipment and personnel.

[0020] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 5 , the present application provides a technical solution: a sealing structure of a quick-opening manhole door of a boiler of a coal-fired unit, comprising a flange 1, the top end of the flange 1 is rotationally connected with a manhole door 4, the bottom end of the manhole door 4 is fixed with a connecting piece 11, a plurality of limiting openings 12 are formed in the connecting piece 11, a first limiting piece is arranged in the flange 1, the first limiting piece comprises a plurality of fixed sleeves 6 fixed on the inner wall of the flange 1, the fixed sleeves 6 correspond to the limiting openings 12 one by one, a heat-sensitive elastic body 7 is fixed in the fixed sleeve 6, a moving block 8 is slidably connected in the fixed sleeve 6, the heat-sensitive elastic body 7 is fixed with the moving block 8, a limiting rod 9 is fixed on one side of the moving block 8, the limiting rod 9 penetrates through the fixed sleeve 6 and is inserted into the limiting opening 12, and a spring 10 is fixed between the moving block 8 and the inner wall of the fixed sleeve 6. The top end of the flange 1 is fixed with a first fixing piece 2, the end of the first fixing piece 2 is rotationally connected with a first rotating rod 3, and the first rotating rod 3 is fixed with the manhole door 4. A plurality of mounting holes 23 are formed in the top end of the flange 1 for fixing the flange 1 on the boiler.

[0021] It should be noted that when the temperature in the boiler rises, the heat-sensitive elastic body 7 expands and drives the moving block 8 to move forward. The movement of the moving block 8 drives the limiting rod 9 to move, so that the limiting rod 9 is inserted into the limiting opening 12 to fix the connecting piece 11 at the bottom end of the manhole door 4.

[0022] As shown in Figure 1 , Figure 4 and Figure 6 , the top end of the flange 1 is provided with a second limiting piece, which comprises a cover rod 17 rotatably connected to the top end of the flange 1, a plurality of moving grooves 20 are formed in the inside of the cover rod 17, a moving plate 21 is slidably connected in the moving grooves 20, a plug 22 is fixed to the bottom end of the moving plate 21, a plurality of connecting blocks 5 corresponding to the plugs 22 are fixed to the outer wall of the manhole door 4, an insertion slot 14 is formed in the top end of the connecting block 5, and the plug 22 penetrates through the cover rod 17 and is inserted into the insertion slot 14. The second limiting piece further comprises a plurality of screw rods 19 screwed to the top end of the cover rod 17, the screw rods 19 correspond to the moving plates 21 one by one, and the bottom end of the screw rod 19 is rotatably connected to the moving plate 21 in the moving groove 20. The top end of the flange 1 is fixed with a second fixing piece 15, the end of the second fixing piece 15 is rotatably connected with a second rotating rod 16, and the second rotating rod 16 is fixed with the cover rod 17. A connecting rod 18 is fixed in the cover rod 17, and the bottom end of the connecting rod 18 is in contact with the top end of the manhole door 4. The cover rod 17 and the connecting rod 18 form a mouth-shaped shape.

[0023] It should be noted that by covering the manhole door 4, the sealing gasket 13 is inserted into the flange 1; then the cover rod 17 is rotated above the manhole door 4, the screw rod 19 is rotated to drive the moving plate 21 to move downward, the moving plate 21 moves downward to drive the plug 22 to insert into the insertion slot 14 to realize limiting and fix the manhole door 4, when the boiler needs to be repaired, the screw rod 19 is rotated in the opposite direction to drive the moving plate 21 to move upward, the moving plate 21 moves upward to drive the plug 22 to move out of the insertion slot 14, then the cover rod 17 is rotated away from the manhole door 4, and finally the manhole door 4 is opened to repair the boiler. The boiler is closed and opened conveniently and quickly, and it is not necessary to install the bolts one by one between the manhole door 4 and the flange 1 and to remove them one by one later, which improves the installation and opening efficiency, and the top end and the bottom end of the manhole door 4 are fixed by the first limiting piece and the second limiting piece, which avoids the loosening of the manhole door 4, the flange 1 and the external fixing device caused by high temperature and high pressure environment, so that the gap between the manhole door 4 and the flange 1 is formed, and then leakage is caused, which not only causes energy waste, but also threatens the safety of surrounding equipment and personnel.

[0024] As shown in Figure 2 , the bottom end of the manhole door 4 is fixed with a sealing gasket 13, and the sealing gasket 13 is tightly attached to the inner wall of the flange 1. The connecting piece 11 is located on the inner side of the sealing gasket 13.

[0025] It should be noted that the sealing gasket 13 can fill the small gap between the manhole door 4 and the flange 1, prevent the internal medium (such as gas, liquid, dust, etc.) from leaking, and prevent external impurities (such as air, moisture, dust) from entering, ensuring the stability of the internal environment of the equipment or system.

[0026] As shown in Figures 1-6 A method for using the sealing structure of the manhole door of the fast-opening coal-fired unit boiler, comprising the following steps: S1: First, cover the manhole door 4 so that the sealing gasket 13 is inserted into the flange 1; S2: Then rotate the cover rod 17 above the manhole door 4, rotate the screw rod 19, so that the screw rod 19 drives the moving plate 21 to move downward, the moving plate 21 drives the insertion block 22 to insert into the insertion slot 14 to realize limiting, because the insertion block 22 is inserted into the insertion slot 14, the cover rod 17 is limited and cannot be rotated, thereby fixing the manhole door 4; S3: When the temperature in the boiler rises, the heat-sensitive elastomer 7 expands and drives the moving block 8 to move forward, the moving block 8 moves and drives the limiting rod 9 to move, so that the limiting rod 9 is inserted into the limiting opening 12, and the connecting piece 11 at the bottom end of the manhole door 4 is fixed; S4: When the boiler stops working, the temperature decreases, the heat-sensitive elastomer 7 returns to the original position, and the spring 10 and the heat-sensitive elastomer 7 drive the limiting rod 9 to return to the original position, and no longer limit and fix the connecting piece 11; S5: When the boiler needs to be repaired, rotate the screw rod 19 in the opposite direction, so that the screw rod 19 drives the moving plate 21 to move upward, the moving plate 21 moves upward and drives the insertion block 22 to move out of the insertion slot 14, then rotate the cover rod 17 away from the manhole door 4, and finally open the manhole door 4 to repair the boiler.

[0027] It should be noted that the double fixation disperses the stress generated by temperature changes, reduces the load of external fixation devices, reduces the risk of loosening and fatigue damage, prolongs the service life, and does not need manual adjustment. The internal limiting rod 9 can automatically respond to temperature changes, adapt to complex working conditions such as boiler start-stop and load fluctuation, and reduce maintenance workload.

[0028] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A quick-opening manhole sealing structure for a coal-fired boiler unit, comprising a flange (1), characterized in that: The top of the flange (1) is rotatably connected to a manhole door (4), and the bottom of the manhole door (4) is fixed with a connector (11). Multiple limiting ports (12) are opened in the connector (11). A first limiting component is provided in the flange (1). The first limiting component includes multiple fixing sleeves (6) fixed to the inner wall of the flange (1). The fixing sleeves (6) correspond one-to-one with the limiting ports (12). A heat-sensitive elastomer (7) is fixed in the fixing sleeve (6). A moving block (8) is slidably connected in the fixing sleeve (6). The heat-sensitive elastomer (7) is fixed to the moving block (8). A limiting rod (9) is fixed on one side of the moving block (8). The limiting rod (9) passes through the fixing sleeve (6) and is inserted into the limiting port (12). A spring (10) is fixed between the moving block (8) and the inner wall of the fixing sleeve (6).

2. The quick-opening manhole sealing structure for a coal-fired boiler unit according to claim 1, characterized in that: The flange (1) is provided with a second limiting member at its top end. The second limiting member includes a cover rod (17) rotatably connected to the top end of the flange (1). Multiple moving grooves (20) are provided inside the cover rod (17). A moving plate (21) is slidably connected inside the moving groove (20). An insert block (22) is fixed at the bottom end of the moving plate (21). Multiple connecting blocks (5) corresponding to the insert blocks (22) are fixed on the outer wall of the manhole door (4). A slot (14) is provided at the top end of the connecting block (5). The insert block (22) passes through the cover rod (17) and is inserted into the slot (14).

3. The quick-opening manhole sealing structure for a coal-fired boiler unit according to claim 2, characterized in that: The second limiting member also includes a plurality of screws (19) screwed to the top of the cover rod (17). The screws (19) correspond one-to-one with the moving plate (21). The bottom end of the screw (19) is located in the moving groove (20) and is rotatably connected to the moving plate (21).

4. The quick-opening manhole sealing structure for a coal-fired boiler unit according to claim 1, characterized in that: The flange (1) is fixed with a first fixing member (2) at its top end, and a first rotating rod (3) is rotatably connected to the end of the first fixing member (2). The first rotating rod (3) is fixed to the manhole door (4).

5. The quick-opening manhole sealing structure for a coal-fired boiler unit according to claim 1, characterized in that: The top of the flange (1) is fixed with a second fixing member (15), and the end of the second fixing member (15) is rotatably connected with a second rotating rod (16), which is fixed to the cover rod (17).

6. The quick-opening manhole sealing structure for a coal-fired boiler unit according to claim 2, characterized in that: A connecting rod (18) is fixed inside the cover rod (17), and the bottom end of the connecting rod (18) contacts the top end of the manhole door (4).

7. The quick-opening manhole sealing structure for a coal-fired boiler unit according to claim 1, characterized in that: The bottom end of the manhole door (4) is fixed with a sealing gasket (13), and the sealing gasket (13) is tightly fitted to the inner wall of the flange (1).

8. The quick-opening manhole sealing structure for a coal-fired boiler unit according to claim 1, characterized in that: The flange (1) has multiple mounting holes (23) extending through its top end.

9. The quick-opening manhole sealing structure for a coal-fired boiler unit according to claim 2, characterized in that: The cover rod (17) and the connecting rod (18) form a U-shape, and the connector (11) is located inside the sealing gasket (13).

10. A method for using a quick-opening coal-fired boiler manhole sealing structure, characterized in that, The quick-opening manhole sealing structure for a coal-fired boiler unit, as described in any one of claims 1-9, is adopted. Includes the following steps: S1: First, by covering the manhole door (4), the gasket (13) is inserted into the flange (1); S2: Then rotate the cover rod (17) above the manhole door (4), and rotate the screw (19) so that the screw (19) drives the moving plate (21) to move downward. The moving plate (21) moves downward and drives the insert (22) to insert into the slot (14) to achieve the limit and fix the manhole door (4). S3: When the temperature inside the boiler rises, the heat-sensitive elastomer (7) expands and drives the moving block (8) to move forward. The movement of the moving block (8) drives the limiting rod (9) to move, so that the limiting rod (9) is inserted into the limiting port (12) to fix the connector (11) at the bottom of the manhole door (4). S4: When the boiler stops working and the temperature drops, the heat-sensitive elastomer (7) returns to its original position, and the spring (10) and the heat-sensitive elastomer (7) drive the limit rod (9) to return to its original position, and no longer limit and fix the connecting part (11); S5: When the boiler needs to be repaired, rotate the screw (19) in the opposite direction so that the screw (19) drives the moving plate (21) to move upward. The moving plate (21) moves upward and drives the insert (22) to move out of the slot (14). Then rotate the cover rod (17) away from the manhole door (4). Finally, open the manhole door (4) to repair the boiler.

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