Stepped double-layer sealed boiler inspection door

Abstract

The utility model discloses a stepped double-layer sealed boiler inspection door which comprises a channel, the edge of an outlet of the channel is folded outwards to form a folded edge, an expansion channel is connected around the outer edge of the folded edge, and the channel outlet and the expansion channel form a stepped shape through the folded edge. A door plate capable of closing the expansion channel is hinged to the outer wall of the expansion channel, a door plate inner interlayer cover is connected to the inner end face of the door plate, a first sealing ring is connected to the portion, surrounding the door plate inner interlayer cover, of the inner end face of the door plate, a wire groove is formed in the first sealing ring, and the folded edge is covered with a second sealing ring and a rotating door plate. The edge of the expansion channel can be embedded into the wire groove, and the door plate inner interlayer cover is pressed on the second sealing ring so as to achieve double-layer sealing. The door has the technical advantages of being simple in structure, convenient to use, good in sealing performance and the like.

Description

Technical Field

[0001] The utility model relates to a boiler inspection door, more specifically, to a stepped double-layer sealed boiler inspection door, belonging to the field of boilers. Background Art

[0002] Inspection doors are installed at the inspection, installation, and cleaning locations of various boiler components. They are required by the regulations to be equipped with components. Inspection doors need to withstand the same pressure and temperature as the boiler body, and must have sealing and temperature resistance. Previous designs often used single-layer sealing and the bolt connection operation was complicated. At the same time, when the boiler withstands negative pressure of more than 10,000 Pa, it can no longer meet the sealing requirements, resulting in widespread cold air leakage on site, reducing the quality of recoverable energy, seriously affecting the main steam production of the boiler, and increasing the load of the blast and induced draft fans and the overall system self-loss. Therefore, it is an inevitable trend to develop an inspection door with technical characteristics such as good sealing effect and convenient opening and closing. Utility Model Content

[0003] In order to solve the above-mentioned problems in the prior art, the utility model provides a stepped double-layer sealed boiler inspection door with technical characteristics such as simple structure, convenient use and good sealing.

[0004] In order to achieve the above purpose, the utility model is implemented by the following technical solutions:

[0005] A stepped double-layer sealed boiler inspection door comprises a channel, wherein the edge of the channel outlet is folded outward to form a folded edge, an expansion channel is connected around the outer edge of the folded edge, the channel outlet and the expansion channel are stepped by the folded edge, a door panel capable of closing the expansion channel is hinged on the outer wall of the expansion channel, an inner interlayer cover of the door panel is connected to the inner end surface of the door panel, a No. 1 sealing ring is connected around the inner interlayer cover of the door panel on the inner end surface of the door panel, a wire groove is provided on the No. 1 sealing ring, and a No. 2 sealing ring is covered on the folded edge, and when the door panel is rotated, the edge of the expansion channel can be embedded in the wire groove and the inner interlayer cover of the door panel is pressed onto the No. 2 sealing ring to achieve double-layer sealing.

[0006] Preferably, a plurality of locking devices are connected to the outer wall of the expansion channel, and the locking devices can be engaged on the outer end surface of the door panel to lock the door panel.

[0007] Preferably, the locking device includes a fixed block connected to the outer wall of the expansion channel, and a rotatable handle is connected to the fixed block via a rotating shaft. Corresponding to the rotating handle, a locking block is connected to the door panel, and the rotating handle can engage and press the handle onto the locking block.

[0008] Preferably, the inner interlayer cover of the door panel is filled with a heat-insulating layer.

[0009] Preferably, one side of the inner sandwich cover of the door panel is tilted so as to leave a gap with the inner wall of the expansion channel, and the width of the gap gradually increases from the outside to the inside.

[0010] Preferably, a sealing ring baffle is connected to the door panel surrounding the No. 1 sealing ring to prevent the No. 1 sealing ring from being squeezed, deformed and overflowing.

[0011] Preferably, the channel, the expansion channel and the folded edge are integrally formed.

[0012] Preferably, the door panel is connected to the outer wall of the expansion channel through a composite hinge.

[0013] Preferably, the extension channel and the door panel are both rectangular, two composite hinges are connected to one side surface of the extension channel, and at least one locking device is connected to each other side surface of the extension channel to achieve uniform sealing and locking force.

[0014] Preferably, a mounting slot is provided on the folded edge, and the No. 2 sealing ring is located in the mounting slot.

[0015] Beneficial effect: The double-layer locking seal effectively improves the air leakage problem of the inspection door when the boiler is running at high negative pressure for a long time. It has the characteristics of high pressure resistance and high efficiency sealing. At the same time, the inspection door is easy and quick to open and close. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the utility model.

[0017] Figure 2 It is a part of the structure of the utility model Figure 1 .

[0018] Figure 3 It is a part of the structure of the utility model Figure 2 .

[0019] Figure 4 It is an enlarged view of point A of the present utility model.

[0020] Figure 5 It is an enlarged view of point B of the present utility model. DETAILED DESCRIPTION

[0021] The following is in conjunction with the instruction manual Figure 1-5 , the utility model is further described, but the utility model is not limited to the following embodiments.

[0022] like Figure 1-5The figure shows a specific embodiment of a stepped double-layer sealed boiler inspection door, which is a stepped double-layer sealed boiler inspection door, including a channel 1, the edge of the channel 1 outlet is folded outward to form a folded edge 2, and an expansion channel 3 is connected around the outer edge of the folded edge 2. The channel 1 outlet and the expansion channel 3 are stepped by the folded edge 2, and a door panel 4 capable of closing the expansion channel 3 is hinged on the outer wall of the expansion channel 3, and a door panel inner sandwich cover 5 is connected to the inner end surface of the door panel 4. A No. 1 sealing ring 6 is connected to the inner end surface of the door panel 4 around the door panel inner sandwich cover 5, and a wire groove is opened on the No. 1 sealing ring 6, and the folded edge 2 is covered with a No. 2 sealing ring 7. When the door panel 4 is rotated, the edge of the expansion channel 3 can be embedded in the wire groove and the door panel inner sandwich cover 5 is pressed on the No. 2 sealing ring 7 to achieve double-layer sealing.

[0023] Usage: Rotate the door panel 4 so that the door panel 4 covers the opening of the extension channel 3. As the door panel 4 is covered, the edge of the extension channel 3 can be embedded in the wire groove to achieve the first seal. Due to the stepped design, when the door panel inner interlayer cover 5 on the inner side of the door panel 4 is completely embedded in the extension channel 3, the door panel inner interlayer cover 5 will be pressed on the second sealing ring 7 to achieve the second seal, which has the characteristics of high pressure resistance and high efficiency sealing.

[0024] A compression gap for the No. 1 sealing ring 6 is preferably reserved between the door panel 4 and the expansion channel 3. The compression gap is required to be ≤10% of the thickness of the No. 1 sealing ring 6. The No. 1 sealing ring 6 adopts a lightweight insulation material with a compression rate of ≤10%. As the door panel 4 is closed, the No. 1 sealing ring 6 is naturally and evenly locked to achieve a one-time locking and sealing of the inspection door. At the same time, a sealing ring baffle 12 is arranged circumferentially on the door panel 4 to prevent the primary sealing ring 6 from being squeezed, deformed and overflowed.

[0025] A compression gap for the No. 2 sealing ring 7 is reserved between the interlayer cover 5 and the folded edge 2 inside the door panel. The compression gap is required to be ≤10% of the thickness of the No. 2 sealing ring 7. The No. 2 sealing ring 7 uses a lightweight thermal insulation material with a compression rate of ≤10%. As the inspection door is closed, the interlayer cover 5 inside the door panel naturally compresses the No. 2 sealing ring 7 to achieve secondary compression and sealing of the inspection door.

[0026] The technical solution of this application improves the sealing performance of the inspection door under high negative pressure conditions through the synergistic effect of the primary and secondary seals, adopts a locking device to improve the opening and closing efficiency of the inspection door, and streamlines the operation process under the premise of ensuring the sealing performance, providing a solid foundation for the efficient operation of the boiler. Conventional bolt-connected single-layer seals are prone to poor sealing of the inspection door after long-term operation, and internal leakage occurs frequently. After adopting this utility model patent, the occurrence of internal leakage can be effectively reduced, reducing the self-consumption of the induced draft fan while improving the efficiency of waste heat recovery.

[0027] Take a 50t / h steel plant sintering cooling process waste heat boiler as an example. In the past, it took 0.5h to open and close a single bolt sealing inspection door. There are 14 inspection doors on a single boiler body. It takes 14h for two people to repair and maintain a single boiler. With this utility model patent, one person can complete it. At the same time, the opening and closing time of a single inspection door can be shortened by half. Calculated based on 5 shutdowns for maintenance per year, this improvement can save 53h of maintenance man-hours. It can be seen that this utility model provides reliable support for flue gas heat recovery and greatly reduces the workload of maintenance personnel.

[0028] In a preferred embodiment, a plurality of locking devices are connected to the outer wall of the expansion channel 3, and the locking devices can be engaged with the outer end surface of the door panel 4 to lock the door panel 4. The locking device includes a fixed block 8, and the fixed block 8 is connected to the outer wall of the expansion channel 3. A rotatable handle 9 is connected to the fixed block 8 through a rotating shaft. A locking block 10 is connected to the door panel 4 corresponding to the rotating handle 9. The handle 9 can be engaged and pressed on the locking block 10 by rotating the handle 9.

[0029] As described above, when the door panel 4 is fully closed, the handle 9 can be rotated to engage and press the handle 9 onto the locking block 10. Multiple locking devices can clamp the door panel 4 in multiple directions to make the pressure uniform. In order to improve the convenience of operation, the locking block 10 has inclined surfaces at both ends and a plane in the middle to form an isosceles trapezoid, so that the handle 9 can be quickly moved and pressed onto the locking block 10.

[0030] In a preferred embodiment, the door panel inner sandwich cover 5 is filled with a heat-insulating layer 11, the door panel 4 and the door panel inner sandwich cover 5 are sealed by welding, and a lightweight heat-insulating material, namely, the heat-insulating layer 11, is filled and compressed in the middle, thereby improving the heat-insulating sealing performance.

[0031] In a preferred embodiment, one side of the interlayer cover 5 in the door panel is tilted to leave a gap with the inner wall of the expansion channel 3, and the width of the gap gradually increases from the outside to the inside, which can ensure smooth opening and closing of the inspection door.

[0032] In a preferred embodiment, a sealing ring baffle 12 is connected to the door panel 4 around the No. 1 sealing ring 6 to prevent the No. 1 sealing ring 6 from being squeezed, deformed and overflowing.

[0033] In a preferred embodiment, the channel 1, the expansion channel 3 and the folded edge 2 are integrally formed, and the structure is firm and practical.

[0034] In a preferred embodiment, the door panel 4 is connected to the outer wall of the extension channel 3 via a composite hinge 13 .

[0035] In a preferred embodiment, the expansion channel 3 and the door panel 4 are both rectangular, two composite hinges are connected to one side of the expansion channel 3, and at least one locking device is connected to each other side of the expansion channel 3 to achieve uniform sealing and locking force.

[0036] Preferably, a mounting slot is provided on the folded edge 2, and the second sealing ring 7 is located in the mounting slot.

[0037] Finally, it should be noted that the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. A stepped double-layer sealed boiler inspection door, comprising a passage (1), Features: The edge of the outlet of the channel (1) is folded outward to form a folded edge (2), and an expansion path (3) is connected around the outer edge of the folded edge (2). The outlet of the channel (1) and the expansion path (3) form a step shape through the folded edge (2). A door panel (4) capable of closing the expansion path (3) is hinged on the outer wall of the expansion path (3). A door panel inner sandwich cover (5) is connected to the inner end surface of the door panel (4). A first sealing ring (6) is connected around the door panel inner sandwich cover (5) on the inner end surface of the door panel (4). A wire groove is provided on the first sealing ring (6). The folded edge (2) is covered with a second sealing ring (7). When the door panel (4) is rotated, the edge of the expansion path (3) can be embedded in the wire groove and the door panel inner sandwich cover (5) is pressed onto the second sealing ring (7) to achieve double-layer sealing.

2. A stepped double-layer sealed boiler inspection door according to claim 1, Features: A plurality of locking devices are connected to the outer wall of the expansion channel (3), and the locking devices can be engaged with the outer end surface of the door panel (4) to lock the door panel (4).

3. A stepped double-layer sealed boiler inspection door according to claim 2, Features: The locking device comprises a fixed block (8), the fixed block (8) being connected to the outer wall of the expansion channel (3), the fixed block (8) being connected to a rotatable handle (9) via a rotating shaft, a locking clamping block (10) being connected to the door panel (4) corresponding to the rotating handle (9), and the handle (9) can be rotated so that the handle (9) is clamped and pressed onto the locking clamping block (10).

4. A stepped double-layer sealed boiler inspection door according to claim 1, Features: The door panel inner sandwich cover (5) is filled with a heat insulation layer (11).

5. A stepped double-layer sealed boiler inspection door according to claim 1, Features: One side of the door panel inner interlayer cover (5) is tilted so as to leave a gap with the inner wall of the expansion channel (3), and the width of the gap gradually increases from the outside to the inside.

6. A stepped double-layer sealed boiler inspection door according to claim 1, Features: A sealing ring baffle (12) is connected to the door panel (4) surrounding the first sealing ring (6) to prevent the first sealing ring (6) from being squeezed, deformed and overflowing.

7. According to claim 1, a stepped double-layer sealed boiler inspection door, Features: The channel (1), the expansion channel (3) and the folded edge (2) are integrally formed.

8. According to claim 1, a stepped double-layer sealed boiler inspection door, Features: The door panel (4) is connected to the outer wall of the expansion channel (3) via a composite hinge (13).

9. According to claim 3, a stepped double-layer sealed boiler inspection door, Features: The expansion channel (3) and the door panel (4) are both rectangular, and two composite hinges are connected to one side of the expansion channel (3), and at least one locking device is connected to each other side of the expansion channel (3) to achieve uniform sealing and locking force.

10. A stepped double-layer sealed boiler inspection door according to claim 1, Features: The folded edge (2) is provided with a mounting slot, and the second sealing ring (7) is located in the mounting slot.

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