CN104864764B - Bypass mutual-lock sealing structure for air pre-heater - Google Patents
Bypass mutual-lock sealing structure for air pre-heater Download PDFInfo
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- CN104864764B CN104864764B CN201510228443.0A CN201510228443A CN104864764B CN 104864764 B CN104864764 B CN 104864764B CN 201510228443 A CN201510228443 A CN 201510228443A CN 104864764 B CN104864764 B CN 104864764B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention discloses a bypass mutual-lock sealing structure for an air pre-heater. The bypass mutual-lock sealing structure comprises a substrate and a sealing part fixed at one side of the substrate. The sealing part comprises multiple sealing pieces which are arranged side by side and obliquely relative to the substrate. Four sides of each sealing piece are respectively a gap lateral side, a plain-end lateral side, an isometric arc side and a fixing lateral side. Each gap lateral side is disposed at the opposite side to each plain-end lateral side and provided with a gap. Each isometric arc side is an isometric arc surface. One side, close to each fixing lateral side, of each sealing piece is fixed onto the substrate. In adjacent sealing pieces, a plain-end lateral side of one sealing piece is arranged below a gap lateral side of the other sealing piece in an overlapping mode. The above plain-end lateral side is in surface contact with an edge of a gap of the above gap lateral side. The sealing pieces are provided with strip-shaped deformed gaps. The bypass mutual-lock sealing structure for the air pre-heater has following beneficial effects: the bypass mutual-lock sealing structure is easily deformed and has good structural stability, sealing effect and long service lifetime under acting forces of sealing rings in a rotor circumferential direction.
Description
Technical field
The present invention relates to air preheater and seal component structural field, particularly relate to a kind of air preheater bypass interlocking-type and seal structure.
Background technology
Rotary regenerative air preheater is called for short air preheater, it it is the heat-exchange apparatus of large-sized boiler, due to relative to tubular air preheater, the feature such as have that compact conformation, volume are little, heat-transfer surface density high, overall mass is light, metal consumption is few, to arrange easy for installation, cold end corrosion lighter, is widely used on station boiler.Air preheater is that the flue gas heat utilizing boiler to discharge preheats the air entered needed for boiler participation burning, or the reclaimer as boiler smoke heat, so that above heat is used as the equipment of other purposes such as fuel dehumidifying, heating, the purpose that this equipment is arranged is to improve the efficiency of boiler.The air leak rate of air curtain of air preheater is the important indicator affecting boiler efficiency, and the above air leak rate of air curtain of air preheater of the prior art is generally 6%-8% under normal circumstances, and poor sealing is even as high as 20%, so, the efficiency of boiler is affected big by the Sealing Technology of air preheater.
In prior art, in air preheater, flue gas and air typically use adverse current, and the one end arranging gas approach and air outlet slit in air preheater is defined as hot junction, and the other end of air preheater is cold end.During air preheater working rotor, inevitably by because hot shaping and gravity deformation are superimposed upon on rotor the mushroom deformation formed.For avoiding air preheater work process rotor and stator contact, the preset clearance between general rotor and stator is relatively big, and the air leak rate of air curtain of air preheater is controlled to serve vital effect by this axial seal structure allowing for rotor.Bypass seal i.e. circumference bypass seal, bypass seal is when air preheater is without effective axial sealer, and it can prevent air from being passed through in shell by rotor circumference with flue gas, and without heating surface；When axial seal imprecision, air side by rotor perimeter in flue, cause air directly to leak.During prior art Practical Project uses, the service life of the bypass seal of air preheater and sealing stability await improving further.
Summary of the invention
In using for above-mentioned prior art Practical Project, the service life of the bypass seal of air preheater and sealing stability await the problem improved further, the invention provides a kind of air preheater bypass interlocking-type and seal structure.
For solving the problems referred to above, the air preheater bypass interlocking-type that the present invention provides seals structure and solves problem by techniques below main points: air preheater bypass interlocking-type seals structure, including substrate and the sealing being fixed on substrate side, described sealing includes multiple diaphragm seal, described diaphragm seal is arranged side by side, and diaphragm seal tilts relative to substrate, four sides of diaphragm seal are respectively breach side, flat mouth side, isometrical arc-shaped edges and fixing side, described breach side is positioned at the offside of flat mouth side, and it is provided with breach on breach side, isometrical arc-shaped edges is isometrical arcwall face, diaphragm seal is fixed on substrate near the side of fixing side, in adjacent diaphragm seal, the flat mouth side of one of them diaphragm seal is erected on below the breach side of another diaphragm seal, and this flat mouth side is that face contacts with the edge of breach on this breach side；
Being additionally provided with the deformation breach in strip on described diaphragm seal, one end of described deformation breach is intersected with isometrical arc-shaped edges, and the length direction of described deformation breach is positioned at the spacing direction of isometrical arc-shaped edges and fixing side.
Concrete, the substrate of setting is for fixing multiple diaphragm seal and the present invention being fixed on by substrate the stator of air preheater；The isometrical arc-shaped edges being arranged on diaphragm seal seals for being formed with the sealing ring in rotor circumference direction；Curvature corresponding to isometrical arc-shaped edges is extraneous between rotor and between diameter of stator bore；The version that diaphragm seal is obliquely installed relative to substrate, facilitate implementation during rotor mushroom deformation, the side action of the sealing ring of rotor circumferential direction in sealing surface near the part of isometrical arc-shaped edges, diaphragm seal generation elastic deformation to such an extent as to the isometrical arc-shaped edges of diaphragm seal can contact with the sealing ring in rotor circumference direction all the time, and the diaphragm seal of cold for rotor end can be installed as free end and towards hot junction and applies primary stress by the diaphragm seal of hot end of rotor being installed as free end towards cold end by process above；As preferred version, in installation process, it is set to diaphragm seal and forms a full circle week around rotor.
In the present invention, it is set to: in adjacent diaphragm seal, the flat mouth side of one of them diaphragm seal is erected on below the breach side of another diaphragm seal, and this flat mouth side is the version that face contacts with the edge of breach on this breach side, the most adjacent diaphragm seal sets up form by breach side concave portion overlap joint, can be during each diaphragm seal stress, particularly in the uneven loading process of rotor deformation, between adjacent diaphragm seal, overlap mutually restricts, avoid that single diaphragm seal deflection is excessive causes plastic deformation, local leakage amount is big, the defects such as diaphragm seal material fatiguability inefficacy；This flat mouth side is in the version that face contacts with the edge of breach on this breach side, this contact surface is preferably fitted with this flat mouth side under diaphragm seal free state completely, when diaphragm seal is heated with free end pressurized, the gap produced on breach can be preferably filled up again in the thermal expansion of diaphragm seal；The diaphragm seal of above version and bonding relation so that be finally similar to an annular sealing ring for realizing the sealing structure of air preheater bypass seal, and the change width of this sealing ring is with rotor deformation as reference quantity, and to strong above with reference to amount adaptive faculty；The deformation breach arranged on the most each diaphragm seal is also used for providing expansion clearance into the thermal stress deformation of diaphragm seal, being beneficial to present invention holding of each diaphragm seal shape during life-time service, the most described deformation breach is the opening V-notch to diaphragm seal free end.
Further technical scheme is:
For ease of present invention installation in concrete utilization, described substrate is a full circle ring or the full circle ring being spliced by multistage arc, the end face of adjacent arc is face contact, and contact surface is positioned at the radial direction of full circle ring, described diaphragm seal is fixed on the inner side of full circle ring, and the isometrical arc-shaped edges of all diaphragm seals is respectively positioned on same circumference.
For ease of replacing and position, the output length adjustment of single diaphragm seal, also including fixture block and many connecting bolts, described diaphragm seal is all folded between bolted fixture block and substrate.
For ease of forming multiple-sealed ring on the axial direction of air preheater rotor, it is beneficial to reduce the slip that passes into others' hands of air preheater, the more than row of diaphragm seal on substrate, and it is contour to be in the diaphragm seal free end with row, the free end end of different row's diaphragm seals is positioned on differing heights.
For reduce diaphragm seal with rotor contact during the rate of wear, described diaphragm seal is two rows, and row's diaphragm seal therein is fixed on another row's diaphragm seal, the free end end spacing with substrate that the free end end of row's diaphragm seal that free end is higher arranges diaphragm seal with the spacing of substrate more than another, the diaphragm seal thickness being in upside is thinner than the diaphragm seal being in downside.In above structure; less owing to being in the diaphragm seal thickness of upside; free end is closer to rotor simultaneously; therefore when the sealing ring of rotor circumferential direction contacts with the diaphragm seal being in upside; the power being subject on the diaphragm seal of upside forces the common part generation elastic deformation of two row's diaphragm seals; to reduce the interaction force of the last sealing ring with rotor circumferential direction of the diaphragm seal free end being in downside, reach the technique effect of thicker diaphragm seal on the downside of protecting.
As a kind of being easy to draw materials, the comprehensive preferred version of the performance such as intensity, rigidity and wearability, described diaphragm seal be thickness between 1 to 2.5mm, the trade mark be the steel plate of 15CrMn.The described trade mark: 15CrMn is derived from GB/T 3077-2006.
The method have the advantages that
The invention discloses a kind of air preheater bypass interlocking-type and seal structure, the substrate of setting is for fixing multiple diaphragm seal and the present invention being fixed on by substrate the stator of air preheater；The isometrical arc-shaped edges being arranged on diaphragm seal seals for being formed with the sealing ring in rotor circumference direction；Curvature corresponding to isometrical arc-shaped edges is extraneous between rotor and between diameter of stator bore；The version that diaphragm seal is obliquely installed relative to substrate, facilitate implementation during rotor mushroom deformation, the side action of the sealing ring of rotor circumferential direction in sealing surface near the part of isometrical arc-shaped edges, diaphragm seal generation elastic deformation to such an extent as to the isometrical arc-shaped edges of diaphragm seal can contact with the sealing ring in rotor circumference direction all the time, and the diaphragm seal of cold for rotor end can be installed as free end and towards hot junction and applies primary stress by the diaphragm seal of hot end of rotor being installed as free end towards cold end by process above；As preferred version, in installation process, it is set to diaphragm seal and forms a full circle week around rotor.
In the present invention, it is set to: in adjacent diaphragm seal, the flat mouth side of one of them diaphragm seal is erected on below the breach side of another diaphragm seal, and this flat mouth side is the version that face contacts with the edge of breach on this breach side, the most adjacent diaphragm seal sets up form by breach side concave portion overlap joint, can be during each diaphragm seal stress, particularly in the uneven loading process of rotor deformation, between adjacent diaphragm seal, overlap mutually restricts, avoid that single diaphragm seal deflection is excessive causes plastic deformation, local leakage amount is big, the defects such as diaphragm seal material fatiguability inefficacy；This flat mouth side is in the version that face contacts with the edge of breach on this breach side, this contact surface is preferably fitted with this flat mouth side under diaphragm seal free state completely, when diaphragm seal is heated with free end pressurized, the gap produced on breach can be preferably filled up again in the thermal expansion of diaphragm seal；The diaphragm seal of above version and bonding relation so that be finally similar to an annular sealing ring for realizing the sealing structure of air preheater bypass seal, and the change width of this sealing ring is with rotor deformation as reference quantity, and to strong above with reference to amount adaptive faculty；The deformation breach arranged on the most each diaphragm seal is also used for providing the holding of each diaphragm seal shape during life-time service of expansion clearance, the beneficially present invention into the thermal stress deformation of diaphragm seal.
Therefore the present invention deforms easily under the active force of the sealing ring of rotor circumferential direction, structural stability is good, good sealing effect, service life are long.
Accompanying drawing explanation
Fig. 1 is that air preheater of the present invention bypass interlocking-type seals in structure, and one uses the structural representation that splicing form forms ring-type air preheater bypass seal specific embodiment；
Fig. 2 is that air preheater of the present invention bypass interlocking-type seals in structure, and one uses the structural representation that full circle ring group plate forms ring-type air preheater bypass seal specific embodiment；
Fig. 3 is that air preheater of the present invention bypass interlocking-type seals in structure, the structural representation of one specific embodiment of diaphragm seal；
Fig. 4 is that air preheater of the present invention bypass interlocking-type seals in structure, a scheme of installation using single diaphragm seal specific embodiment；
Fig. 5 is that air preheater of the present invention bypass interlocking-type seals in structure, a scheme of installation using double diaphragm seal specific embodiment.
Figure acceptance of the bid note is respectively as follows: 1, substrate, and 2, fixture block, 3, connecting bolt, 4, diaphragm seal, 41, breach, 42, breach side, 43, flat mouth side, 44, isometrical arc-shaped edges, 45, fixing side, 46, deformation breach.
Detailed description of the invention
The invention provides one air preheater bypass interlocking-type and seal structure, be used for solving: during prior art Practical Project uses, the problem that the service life of the bypass seal of air preheater and sealing stability await improving further.The structure provided by the present invention can reach techniques below effect: this sealing structure deforms easily under the active force of the sealing ring of rotor circumferential direction, structural stability is good, good sealing effect, service life are long.
Below in conjunction with embodiment, the present invention is described in further detail, but the present invention is not limited only to following example:
Embodiment 1:
nullAs shown in Figures 1 to 4，Air preheater bypass interlocking-type seals structure，Including substrate 1 and the sealing being fixed on substrate 1 side，Described sealing includes multiple diaphragm seal 4，Described diaphragm seal 4 is arranged side by side，And diaphragm seal 4 tilts relative to substrate 1，Four sides of diaphragm seal 4 are respectively breach side 42、Flat mouth side 43、Isometrical arc-shaped edges 44 and fixing side 45，Described breach side 42 is positioned at the offside of flat mouth side 43，And on breach side 42, it is provided with breach 41，Isometrical arc-shaped edges 44 is isometrical arcwall face，Diaphragm seal 4 is fixed on substrate 1 near the side of fixing side 45，In adjacent diaphragm seal 4，The flat mouth side 43 of one of them diaphragm seal 4 is erected on the breach side less than 42 of another diaphragm seal 4，And this flat mouth side 43 is that face contacts with the edge of breach 41 on this breach side 42；
Being additionally provided with the deformation breach 46 in strip on described diaphragm seal 4, one end of described deformation breach 46 is intersected with isometrical arc-shaped edges 44, and the length direction of described deformation breach 46 is positioned at the spacing direction of isometrical arc-shaped edges 44 and fixing side 45.
Concrete, in the present embodiment, the substrate 1 of setting is for fixing multiple diaphragm seal 4 and the present invention being fixed on by substrate 1 stator of air preheater；The isometrical arc-shaped edges 44 being arranged on diaphragm seal 4 seals for being formed with the sealing ring in rotor circumference direction；The curvature of isometrical arc-shaped edges 44 correspondence is between the rotor external world and diameter of stator bore；The version that diaphragm seal 4 is obliquely installed relative to substrate 1, facilitate implementation during rotor mushroom deformation, the side action of the sealing ring of rotor circumferential direction in sealing surface near the part of isometrical arc-shaped edges 44, elastic deformation occurs diaphragm seal 4 to such an extent as to the isometrical arc-shaped edges 44 of diaphragm seal 4 can contact with the sealing ring in rotor circumference direction all the time, and the diaphragm seal 4 of cold for rotor end can be installed as free end and towards hot junction and applies primary stress by the diaphragm seal 4 of hot end of rotor being installed as free end towards cold end by process above；As preferred version, in installation process, it is set to diaphragm seal 4 and forms a full circle week around rotor.
In the present embodiment, it is set to: in adjacent diaphragm seal 4, the flat mouth side 43 of one of them diaphragm seal 4 is erected on the breach side less than 42 of another diaphragm seal 4, and this flat mouth side 43 is the version that face contacts with the edge of breach 41 on this breach side 42, the most adjacent diaphragm seal 4 sets up form by breach side 42 concave portion overlap joint, can be during each diaphragm seal 4 stress, particularly in the uneven loading process of rotor deformation, between adjacent diaphragm seal 4, overlap mutually restricts, avoid that single diaphragm seal 4 deflection is excessive causes plastic deformation, local leakage amount is big, the defects such as diaphragm seal 4 material fatiguability inefficacy；This flat mouth side 43 is in the version that face contacts with the edge of breach 41 on this breach side 42, this contact surface is preferably fitted with this flat mouth side 43 under diaphragm seal 4 free state completely, when diaphragm seal 4 is heated with free end pressurized, the gap produced on breach 41 can be preferably filled up again in the thermal expansion of diaphragm seal 4；The diaphragm seal 4 of above version and bonding relation so that be finally similar to an annular sealing ring for realizing the sealing structure of air preheater bypass seal, and the change width of this sealing ring is with rotor deformation as reference quantity, and to strong above with reference to amount adaptive faculty；The deformation breach 46 arranged on the most each diaphragm seal 4 is also used for providing expansion clearance into the thermal stress deformation of diaphragm seal 4, being beneficial to present invention holding of each diaphragm seal 4 shape during life-time service, the most described deformation breach 46 is the opening V-notch 41 to diaphragm seal 4 free end.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1, as shown in Figures 1 to 5, for ease of present invention installation in concrete utilization, described substrate 1 is a full circle ring or the full circle ring being spliced by multistage arc, the end face of adjacent arc is face contact, and contact surface is positioned at the radial direction of full circle ring, described diaphragm seal 4 is fixed on the inner side of full circle ring, and the isometrical arc-shaped edges 44 of all diaphragm seals 4 is respectively positioned on same circumference.Both the above form is as depicted in figs. 1 and 2.
For ease of replacing and position, the output length adjustment of single diaphragm seal 4, also including fixture block 2 and many connecting bolts 3, described diaphragm seal 4 is all folded between bolted fixture block 2 and substrate 1.
As a kind of being easy to draw materials, the comprehensive preferred version of the performance such as intensity, rigidity and wearability, described diaphragm seal 4 be thickness between 1 to 2.5mm, the trade mark be the steel plate of 15CrMn.The described trade mark: 15CrMn is derived from GB/T 3077-2006.
Embodiment 3:
The present embodiment is based on embodiment 1, as shown in Figures 1 to 5, for ease of forming multiple-sealed ring on the axial direction of air preheater rotor, it is beneficial to reduce the slip that passes into others' hands of air preheater, the more than row of diaphragm seal 4 on substrate 1, and it is contour to be in diaphragm seal 4 free end with row, the free end end of different row's diaphragm seals 4 is positioned on differing heights.
For reduce diaphragm seal 4 with rotor contact during the rate of wear, described diaphragm seal 4 is two rows, and row's diaphragm seal 4 therein is fixed on another row's diaphragm seal 4, the free end end spacing with substrate 1 that the free end end of row's diaphragm seal 4 that free end is higher arranges diaphragm seal 4 with the spacing of substrate 1 more than another, diaphragm seal 4 thickness being in upside is thinner than the diaphragm seal 4 being in downside.In above structure; less owing to being in diaphragm seal 4 thickness of upside; free end is closer to rotor simultaneously; therefore when the sealing ring of rotor circumferential direction contacts with the diaphragm seal 4 being in upside; the power being subject on the diaphragm seal 4 of upside forces the common part generation elastic deformation of two row's diaphragm seals 4; to reduce the interaction force of the last sealing ring with rotor circumferential direction of diaphragm seal 4 free end being in downside, reach the technique effect of thicker diaphragm seal 4 on the downside of protecting.
Above content is to combine the further description that the present invention is made by concrete preferred implementation, it is impossible to assert that the detailed description of the invention of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, other embodiments drawn under without departing from technical scheme, should be included in protection scope of the present invention.
Claims (6)
1. air preheater bypass interlocking-type seals structure, including substrate (1) and the sealing that is fixed on substrate (1) side, it is characterized in that, described sealing includes multiple diaphragm seal (4), described diaphragm seal (4) is arranged side by side, and diaphragm seal (4) tilts relative to substrate (1), four sides of diaphragm seal (4) are respectively breach side (42), flat mouth side (43), isometrical arc-shaped edges (44) and fixing side (45), described breach side (42) is positioned at the offside of flat mouth side (43), and on breach side (42), it is provided with breach (41), isometrical arc-shaped edges (44) is isometrical arcwall face, diaphragm seal (4) is fixed on substrate (1) near the side of fixing side (45)；
In adjacent diaphragm seal (4), the flat mouth side (43) of one of them diaphragm seal (4) is erected on the breach side (42) of another diaphragm seal (4) below, and the edge of this flat mouth side (43) breach (41) upper with this breach side (42) is that face contacts；
The deformation breach (46) in strip it is additionally provided with on described diaphragm seal (4), one end of described deformation breach (46) is intersected with isometrical arc-shaped edges (44), and the length direction of described deformation breach (46) is positioned at the spacing direction of isometrical arc-shaped edges (44) and fixing side (45)；
Described deformation breach (46) is the opening V-notch to diaphragm seal (4) free end.
Air preheater the most according to claim 1 bypass interlocking-type seals structure, it is characterized in that, described substrate (1) is a full circle ring or the full circle ring being spliced by multistage arc, the end face of adjacent arc is face contact, and contact surface is positioned at the radial direction of full circle ring, described diaphragm seal (4) is fixed on the inner side of full circle ring, and the isometrical arc-shaped edges (44) of all diaphragm seals (4) is respectively positioned on same circumference.
Air preheater the most according to claim 1 bypass interlocking-type seals structure, it is characterised in that also including fixture block (2) and many connecting bolts (3), described diaphragm seal (4) is all folded between bolted fixture block (2) and substrate (1).
Air preheater the most according to claim 1 bypass interlocking-type seals structure, it is characterized in that, the more than row of diaphragm seal (4) on substrate (1), and it is contour to be in diaphragm seal (4) free end with row, the free end end of different rows' diaphragm seal (4) is positioned on differing heights.
Air preheater the most according to claim 4 bypass interlocking-type seals structure, it is characterized in that, described diaphragm seal (4) is two rows, and row's diaphragm seal (4) therein is fixed on another row's diaphragm seal (4), the free end end spacing with substrate (1) that the free end end of row's diaphragm seal (4) that free end is higher arranges diaphragm seal (4) with the spacing of substrate (1) more than another, diaphragm seal (4) thickness being in upside is thinner than the diaphragm seal (4) being in downside.
Air preheater the most according to claim 1 bypass interlocking-type seal structure, it is characterised in that described diaphragm seal (4) be thickness between 1 to 2.5mm, the trade mark be the steel plate of 15CrMn.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510228443.0A CN104864764B (en) | 2015-05-07 | 2015-05-07 | Bypass mutual-lock sealing structure for air pre-heater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510228443.0A CN104864764B (en) | 2015-05-07 | 2015-05-07 | Bypass mutual-lock sealing structure for air pre-heater |
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| CN104864764B true CN104864764B (en) | 2017-01-11 |
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| CN114877071B (en) * | 2022-05-12 | 2023-09-05 | 中国航发四川燃气涡轮研究院 | Fingertip sealing structure with contact finger and processing method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2288009A (en) * | 1994-03-31 | 1995-10-04 | Wes Technology Inc | Sealing in rotary regenerative heaters |
| JP2000193386A (en) * | 1998-12-25 | 2000-07-14 | Kansai Electric Power Co Inc:The | Rotating reproduction heat exchanger |
| CN2738193Y (en) * | 2004-09-04 | 2005-11-02 | 王卫东 | Spoke type sealing device for rotary air preheater |
| CN100535573C (en) * | 2006-05-12 | 2009-09-02 | 北京化工大学 | Rotary air preheater with brush type sealing device |
| CN201514151U (en) * | 2009-09-28 | 2010-06-23 | 哈尔滨润河科技有限公司 | Rotary air preheater sealing device |
| CN201652409U (en) * | 2010-04-28 | 2010-11-24 | 哈尔滨锅炉厂预热器有限责任公司 | High efficient and sealed rotary type air preheater and sealing member structure thereof |
| CN204594304U (en) * | 2015-05-07 | 2015-08-26 | 四川东能节能技术有限公司 | Air preheater bypass flap seal structure |
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