CN220551281U - Sealing structure of central air duct of axial-flow induced draft fan - Google Patents
Sealing structure of central air duct of axial-flow induced draft fan Download PDFInfo
- Publication number
- CN220551281U CN220551281U CN202321737728.3U CN202321737728U CN220551281U CN 220551281 U CN220551281 U CN 220551281U CN 202321737728 U CN202321737728 U CN 202321737728U CN 220551281 U CN220551281 U CN 220551281U
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- air duct
- sealing
- diffusion
- dryer
- central
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- 238000007789 sealing Methods 0.000 title claims abstract description 47
- 238000009792 diffusion process Methods 0.000 claims abstract description 39
- 238000005260 corrosion Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000010963 304 stainless steel Substances 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 6
- 239000000428 dust Substances 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 244000208734 Pisonia aculeata Species 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Drying Of Solid Materials (AREA)
Abstract
The utility model relates to a central air duct sealing structure of an axial-flow induced draft fan, which comprises two guide rails, wherein a diffusion air duct and an air inlet air duct are respectively connected to the two guide rails in a sliding manner, a main body air duct is arranged between the diffusion air duct and the air inlet air duct, central air ducts are arranged in the diffusion air duct and the air inlet air duct, impellers are arranged in the main body air duct, and the central air duct corresponds to the impellers; the two inner walls of the central air duct are connected with sealing plates through bolts, strip-shaped threaded holes are formed in the sealing plates, the positions of the sealing plates can be adjusted according to the position deviation of the air inlet air duct and the diffusion air duct during the reflow, the gaps between the air inlet air duct and the diffusion air duct and the main air duct are reduced, and the rate of equipment dust accumulation and smoke corrosion in the central air duct is effectively reduced.
Description
Technical Field
The utility model relates to a central air duct sealing structure of an axial flow type induced draft fan, and belongs to the technical field of axial flow fans.
Background
The induced air blower of the thermal power plant can suck out the products of boiler combustion from the tail flue and discharge the products into the atmosphere through the chimney. At present, an induced draft fan of a thermal power plant is often an axial flow fan and is arranged between a dust remover and a desulfurizing tower.
The air inlet air cylinders and the diffusion air cylinders of some axial-flow induced fans need to be pulled back and forth during installation and maintenance, the air inlet air cylinders and the diffusion air cylinders need to slide along the base rails, and when the outer rings of the air inlet air cylinders and the diffusion air cylinders are locked through bolts during pull-back, the central air cylinder gap of the inner ring should be as small as possible; however, in practice, the mounting error at the time of pull-back causes uneven gaps between the left and right sides. Deformation after long-term operation causes the whole circumference of the central air duct to deform, and the gap between the central air duct and the impeller is quite irregular. The installation error and the deformation of the parts after long-time operation exist, the gap between the air inlet air cylinder and the diffusion air cylinder after the assembly and the main air cylinder is enlarged, so that smoke and dust enter the central air cylinder from the gap, the dust accumulation of the hub and the hydraulic cylinder and the smoke corrosion degree and rate are accelerated, and the service lives of the hub bolts and the hydraulic cylinder are shortened.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides the central air duct sealing structure of the axial-flow type induced draft fan, which can adjust the positions of sealing sheets according to the position deviation of the air inlet air duct and the diffusion air duct during the reflow, reduce the gap between the air inlet air duct and the diffusion air duct and the main air duct, and effectively reduce the rate of dust accumulation and smoke corrosion of equipment in the central air duct.
The technical scheme of the utility model is as follows:
the utility model provides an axial-flow type draught fan center dryer seal structure, includes two guide rails, two on the guide rail sliding connection have diffusion dryer and air inlet dryer respectively, be provided with the main part dryer between diffusion dryer and the air inlet dryer, diffusion dryer and air inlet dryer are inside to be provided with the center dryer, the inside impeller that is provided with of main part dryer, center dryer corresponds with the impeller; the two inner walls of the central air duct are connected with sealing sheets through bolts, and strip-shaped threaded holes are formed in the sealing sheets.
The inner wall of the sealing piece is also provided with a pressing plate in a fitting mode, and the pressing plate is connected with the central air duct through a bolt and compacts the sealing piece to be tightly attached to the inner wall of the central air duct.
Wherein, the sealing sheet is made of 304 stainless steel with the thickness of 1mm, and the surface is coated with a corrosion-resistant coating.
Wherein, the clamp plate adopts Q235 carbon steel that thickness is 3mm to make.
Wherein, sealing piece and clamp plate are each a plurality of arc structures concatenation and form.
The utility model has the following beneficial effects:
this device is through the central dryer internally mounted sealing washer at diffusion dryer and inlet air dryer to through set up the rectangular shape screw hole that sets up along central dryer axial on the sealing washer, can produce the clearance between diffusion dryer and inlet air dryer two and main part dryer, through loosening the bolt and remove the sealing washer, through sealing washer shutoff clearance, can reduce the clearance between inlet air dryer and diffusion dryer and the main part dryer, effectively reduce the rate of equipment deposition and flue gas corrosion in the central dryer.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
fig. 2 is a semi-sectional view of the interior of the present utility model.
The reference numerals in the drawings are as follows:
1. a guide rail; 2. a diffusion wind barrel; 3. an air inlet air duct; 4. a main body air duct; 5. a central air duct; 7. a sealing sheet; 8. and (5) pressing plates.
Detailed Description
The utility model will now be described in detail with reference to the drawings and to specific embodiments.
Referring to fig. 1 and 2, the utility model provides a technical scheme:
the utility model provides an axial-flow type draught fan center dryer seal structure, including two guide rails 1, sliding connection has diffusion dryer 2 and inlet air dryer 3 respectively on two guide rails 1, be provided with main part dryer 4 between diffusion dryer 2 and the inlet air dryer 3, diffusion dryer 2 and inlet air dryer 3 are mutually independent, lay respectively with main part dryer 4's both sides, two guide rails 1 include four slide rails, diffusion dryer 2 and inlet air dryer 3 each are equipped with two slide rails that set up side by side about promptly, diffusion dryer 2 and inlet air dryer 3 inside all are provided with center dryer 5, inside dryer (the part that does not walk the flue gas promptly) is called center dryer 5, main part dryer 4 inside is provided with the impeller, center dryer 5 corresponds with the impeller, in the design, main part dryer 4 both sides should closely laminate with the impeller with diffusion dryer 2 and inlet air dryer 3 (i.e. diffusion dryer, inlet air dryer and main part dryer's outer lane) through the bolt locking. Due to installation errors, deformation of parts after long-time operation and other factors, gaps between the air inlet air duct 3 and the diffusion air duct 2 after the air inlet air duct is assembled back and the main air duct 4 are changed, so that flue gas and dust enter the central air duct 5 from the gaps; the sealing plates 7 are provided with strip-shaped threaded holes, the inner walls of the two central air cylinders 5 are connected with the sealing plates 7 through bolts, and are connected with the inner walls of the central air cylinders 5 through the matching bolts of the strip-shaped threaded holes, the inner walls of the sealing plates 7 are also provided with pressing plates 8 in a fitting mode, the pressing plates 8 are connected with the central air cylinders 5 through bolts, and the sealing plates 7 are tightly fixed on the inner walls of the central air cylinders 5, namely, a cylindrical structure from outside to inside of the central air cylinders 5, the sealing plates 7 and the pressing plates 8 is integrally formed; at this time, when the installation or maintenance is finished, after the fan is assembled again, the diffusion air duct 2 and the air inlet air duct 3 are pulled again and locked with the flange surface, the relative position of the air duct of the whole fan is fixed, although the whole fan is pulled again and combined into a whole, the gap between the diffusion air duct 2 and the air inlet air duct 3 and the main air duct 4 is enlarged due to installation errors, deformation of parts after long-time operation and other factors, at this time, the gaps between the diffusion air duct 2 and the air inlet air duct 3 and the main air duct 4 respectively enter the inside of the central air duct 5 of the diffusion air duct 2 and the air inlet air duct 3, the bolts are loosened slightly, the pressing plate 8 is led to loosen the compaction effect on the sealing plate 7, at this time, the sealing plate 7 is provided with the strip-shaped threaded holes, the trend of the strip-shaped threaded holes is the axial direction of the central air duct 5, the sealing plate 7 can be slightly knocked to drive the sealing plate 7 to move upwards on the strip-shaped threaded holes until the gap reaches a reasonable range, the gap at the position close to the impeller at the central air duct 5 is filled, the width of the sealing plate is about 50mm, the gap between the pressing plate is about 30mm, the gap between the central air duct 5 and the impeller is generally within the range of 10-15 mm along the circumference, the gap between the size can be completely reduced.
As a preference, the sealing sheet 7 is made of 304 stainless steel having a thickness of 1mm and having an anti-coating corrosion coating such as teflon coating, graphene coating, etc. on the surface thereof; the platen 8 is made of Q235 carbon steel with a thickness of 3 mm.
Preferably, the sealing sheet 7 and the pressing plate 8 are formed by splicing a plurality of arc structures; namely, the sealing sheet 7 and the pressing plate 8 are equally divided into small arc-shaped structures, and the arc-shaped structures can be adjusted according to the actual conditions of gaps at all positions, so that the sealing reliability is ensured.
The working principle of the sealing structure of the central air duct of the axial flow type induced draft fan is as follows:
under normal state, main part dryer 4 both sides are in the same place with diffusion dryer 2 and air inlet dryer 3 laminating, and when installing or overhauling, need draw to close diffusion dryer 2 and air inlet dryer 3 through guide rail 1 back and forth, at this moment, the clearance between diffusion dryer 2 and air inlet dryer 3 and main part dryer 4 is opened promptly, at this moment, when installing or overhauling finishes, when the fan is back-loading, diffusion dryer 2 and air inlet dryer 3 again draw behind the locking flange face, the wind channel relative position of whole fan is accomplished fixedly, though whole drawing again closes as an organic whole, but because of the existence of factors such as installation error and long-time operation back part deformation, clearance between diffusion dryer 2 and air inlet dryer 3 and main part dryer 4 grow, at this moment, get into diffusion dryer 2 and air inlet dryer 3's center dryer 5 inside respectively, slightly loosen the bolt, then remove sealing piece 7, it can to reach reasonable scope to seal clearance here.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (5)
1. The utility model provides an axial-flow type draught fan center dryer seal structure which characterized in that: the air inlet device comprises two guide rails (1), wherein two guide rails (1) are respectively connected with a diffusion air cylinder (2) and an air inlet air cylinder (3) in a sliding manner, a main body air cylinder (4) is arranged between the diffusion air cylinder (2) and the air inlet air cylinder (3), central air cylinders (5) are respectively arranged in the diffusion air cylinder (2) and the air inlet air cylinder (3), impellers are arranged in the main body air cylinders (4), and the central air cylinders (5) correspond to the impellers; the inner walls of the two central air cylinders (5) are connected with sealing sheets (7) through bolts, and the sealing sheets (7) are provided with strip-shaped threaded holes.
2. The center wind tunnel sealing structure of an axial flow type induced draft fan according to claim 1, wherein: the inner wall of the sealing piece (7) is also provided with a pressing plate (8) in a fitting way, and the pressing plate (8) is connected with the central air duct (5) through a bolt and compacts the sealing piece (7) to be tightly attached to the inner wall of the central air duct (5).
3. The center wind tube sealing structure of axial flow type induced draft fan as claimed in claim 2, wherein: the sealing sheet (7) is made of 304 stainless steel with the thickness of 1mm, and the surface of the sealing sheet is coated with an anti-corrosion coating.
4. A central dryer sealing structure of an axial-flow induced-draft fan as claimed in claim 3, wherein: the pressing plate (8) is made of Q235 carbon steel with the thickness of 3 mm.
5. The center wind tunnel sealing structure of an axial flow type induced draft fan as claimed in claim 4, wherein: the sealing piece (7) and the pressing plate (8) are formed by splicing a plurality of arc structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321737728.3U CN220551281U (en) | 2023-07-04 | 2023-07-04 | Sealing structure of central air duct of axial-flow induced draft fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321737728.3U CN220551281U (en) | 2023-07-04 | 2023-07-04 | Sealing structure of central air duct of axial-flow induced draft fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220551281U true CN220551281U (en) | 2024-03-01 |
Family
ID=90010382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321737728.3U Active CN220551281U (en) | 2023-07-04 | 2023-07-04 | Sealing structure of central air duct of axial-flow induced draft fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220551281U (en) |
-
2023
- 2023-07-04 CN CN202321737728.3U patent/CN220551281U/en active Active
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