CN220892293U - Bimetal thermal compensation sealing device of air preheater - Google Patents
Bimetal thermal compensation sealing device of air preheater Download PDFInfo
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- CN220892293U CN220892293U CN202322475565.2U CN202322475565U CN220892293U CN 220892293 U CN220892293 U CN 220892293U CN 202322475565 U CN202322475565 U CN 202322475565U CN 220892293 U CN220892293 U CN 220892293U
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- 238000007789 sealing Methods 0.000 title claims abstract description 183
- 238000003475 lamination Methods 0.000 claims abstract description 69
- 238000005452 bending Methods 0.000 claims abstract description 39
- 238000005192 partition Methods 0.000 claims abstract description 32
- 230000007246 mechanism Effects 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000004323 axial length Effects 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 17
- 238000005516 engineering process Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 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
- 238000000034 method Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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 utility model discloses a bimetal thermal compensation sealing device of an air preheater, which is arranged on a radial partition plate at the hot end of a rotor of the air preheater, and at least comprises a sealing lamination and a driving plate which are arranged along the thickness direction, wherein the linear expansion coefficient of the driving plate is larger than that of the sealing lamination, and the device also comprises a backing plate; baffle, backing plate, drive plate and sealed lamination set gradually along thickness direction, and baffle, backing plate and drive plate's top all is less than sealed lamination's top, and the backing plate top is higher than the baffle top, and the backing plate top is the bending of skew drive plate higher than the baffle. The utility model adopts the structure of combining the backing plate, the driving plate and the sealing lamination, combines the advantages of rigid sealing and flexible sealing, not only can effectively compensate the triangular air leakage area of the air preheater caused by heating and obviously reduce the air leakage rate of the air preheater, but also can elastically yield the sealing lamination once the air preheater is worn, does not need to be provided with structures such as a sealing hinge, a spring and the like, has low noise, long service life, stable and safe operation and easy replacement.
Description
Technical Field
The utility model relates to a bimetal thermal compensation sealing device of an air preheater, and belongs to the technical field of sealing.
Background
The rotary air preheater is tail flue gas heat exchange equipment commonly adopted in large coal-fired power plants, helps the system to improve heat transfer efficiency and reduce heat loss, and has the characteristics of small volume, high heat exchange surface density, light weight, contribution to installation and arrangement, light low-temperature corrosion compared with a tubular heat exchanger and the like. When the air preheater is operated, because a large pressure difference exists between the flue gas side and the air side, air can leak to the flue gas side through a gap between the rotor and the shell, so that the heat efficiency of the boiler is reduced, the coal consumption is increased, and the rated load of the boiler is not reached, thereby influencing the economic benefit of a power plant. And when the air leakage quantity is extremely large, the boiler output can be reduced, and the safe operation of the power plant is affected. The main method for reducing the air leakage is to install a seal at the air leakage position, and the common seals can be divided into a rigid seal and a flexible seal.
The traditional air preheater sealing technology adopts a rigid sealing technology with gaps. The sealing technology is to calculate the thermal expansion gap of the rotor in advance, directly install the rigid sealing plate on the air preheater rotor grid plate, form a plurality of air reservoirs between the sealing plates in the rotating process of the rotor, and reduce the pressure difference along with the rotating direction in turn, thus achieving the purpose of reducing the air leakage rate. Because the set clearance value is calculated according to the full-load running state, the air leakage is larger during half-load running; when the operation is abnormal (such as abnormal smoke temperature), the rotor is easy to be blocked.
The flexible seal mainly adopts a mode of sealing hinges and springs, and the springs are deformed and fail after long-time operation, so that the elasticity is reduced, and the rotating speed of the air preheater is influenced. The sealing piece can compensate abrasion in a certain range according to abrasion conditions, but noise is extremely high in the operation process, the spring piece is easy to fatigue fracture, the strength and the service life of the sealing piece are difficult to ensure, the safe operation of the air preheater is influenced, and a plurality of adverse effects are brought.
Although the air preheater sealing technology has been developed, the air preheater sealing technology has problems such as too loud noise, short service life and difficult replacement. In order to better meet the operation requirement of a boiler, effectively reduce the air leakage rate and the station service power consumption of the air preheater, improve the efficiency of the boiler and achieve the purposes of energy conservation and emission reduction, a set of sealing device capable of meeting engineering application for a long time is urgently needed to be developed and applied.
Disclosure of Invention
The utility model provides a bimetal thermal compensation sealing device of an air preheater, which is arranged on a radial partition plate at the hot end of a rotor of the air preheater and is used for eliminating a triangular air leakage area of the air preheater caused by heating, so that the air leakage rate of the air preheater is obviously reduced, and the device is low in noise, long in service life and easy to replace.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
The bimetal thermal compensation sealing device of the air preheater is arranged on a radial partition plate at the hot end of a rotor of the air preheater, one end of the bimetal thermal compensation sealing device is close to a rotor central cylinder, the other end of the bimetal thermal compensation sealing device is close to angle steel at the outer edge of the rotor, the bimetal thermal compensation sealing device at least comprises a sealing lamination and a driving plate which are arranged along the thickness direction, the linear expansion coefficient of the driving plate is larger than that of the sealing lamination, and the driving plate also comprises a backing plate; baffle, backing plate, drive plate and sealed lamination set gradually along thickness direction, and baffle, backing plate and drive plate's top all is less than sealed lamination's top, and the backing plate top is higher than the baffle top, and the backing plate top is the bending of skew drive plate higher than the baffle.
The part of the top of the backing plate, which is higher than the partition plate, is bent away from the driving plate, namely, the part of the top of the backing plate, which is higher than the partition plate, is bent towards the direction away from the driving plate, namely, towards the partition plate.
The base plate is arranged, and meanwhile, the bending part of the base plate beyond the partition plate is provided with the bending part, so that the effect of effectively resisting deformation can be achieved, and the service life of the device is prolonged; the setting of backing plate can cover burr, solder joint etc. on the baffle simultaneously, improves the stability of device. In practice, after multiple overhauls, the mounting holes on the partition plate can be enlarged, and the application is provided with the backing plate, and the standard design of the mounting holes on the backing plate improves the stability of the sealing device.
The drive plate has a linear expansion coefficient greater than the linear expansion coefficient of the seal stack. Like this, when being heated, can produce relative differential expansion between drive plate and the sealed lamination, sealed lamination produces upwarp deformation under the drive of drive plate, and then effectively compensates the air leakage clearance, and when sealed lamination upwarp excessive time, sealed lamination possesses buffering and transitional effect.
The application adopts the structure of combining the backing plate, the driving plate and the sealing lamination instead of adopting the structure of sealing hinges, springs and the like, has the characteristics of rigidity and flexibility, and can effectively reduce the air leakage rate of the air preheater, and has the advantages of low noise, long service life and stable and safe operation.
The rotor center cylinder, the rotor outer edge angle steel, the partition plate, the sector plates and the like are all conventional components of the air preheater, and the application is not repeated.
In order to facilitate processing and ensure stability of the device, as one preferable specific embodiment, the bending of the backing plate is one-time bending, and the bending angle of the backing plate is 35-60 degrees.
Further preferably, the thickness of the backing plate is 1-2mm, and the backing plate is made of a metal material having a difference of not more than 30% from the expansion coefficient of the separator. For example, the backing plate can be made of carbon steel.
In order to achieve both sealing effect and workability, the sealing lamination is formed by overlapping a sealing sheet and a sealing thick sheet along the thickness direction, wherein the thickness of the sealing sheet is 1-2mm, the thickness of the sealing thick sheet is 2.5-3.5mm, the bottom of the sealing sheet is aligned with the bottom of the sealing thick sheet, and the top of the sealing sheet is 2-6mm higher than the top of the sealing thick sheet.
In order to further improve structural stability, the sealing thick plates are adjacent to the driving plate, and the sealing thin plates and the tops of the sealing thick plates are all provided with one-time bending at the same height, and the bending angle of the sealing thick plates is larger than that of the sealing thin plates. Thus, the sealing thick sheet can effectively support and strengthen the sealing thin sheet and can play a double sealing effect.
In order to achieve both sealing effect and stability, the bending directions of the sealing thin sheet, the sealing thick sheet and the backing plate are the same; wherein, the bending angle of the sealing thick sheet and the sealing thin sheet is smaller than the bending angle of the backing plate. In this way, once the compensation amount is too large, the impact grinding occurs, and the sealing lamination can effectively elastically retract.
As a preferred embodiment, the bending angle of the backing plate is 40-50 degrees, the bending angle of the sealing thick sheet is 25-30 degrees, and the bending angle of the sealing thin sheet is 15-20 degrees.
The bending angle of the application is the angle of each component deviating from the vertical direction.
The terms vertical, top, bottom, up, down, and the like of the present application refer to relative positions shown in the drawings, and when the direction of the device is changed, the relative positional relationship thereof is also changed adaptively, so that the present application is not to be construed as being absolutely limited.
The top of the sealing sheet, sealing thick sheet, partition plate, backing plate, etc., i.e., the upper edge of the sealing sheet, sealing thick sheet, partition plate, backing plate, etc., and the lower part of the sealing sheet, sealing thick sheet, partition plate, backing plate, etc., i.e., the lower edge of the sealing sheet, sealing thick sheet, partition plate, backing plate, etc.
In order to further improve stability and sealing effect, the bimetal thermal compensation sealing device of the air preheater further comprises a pressing plate, a clamping bolt and a sleeve; the separator, the backing plate, the driving plate, the sealing lamination and the pressing plate are sequentially arranged along the thickness direction, and the tops of the separator, the backing plate, the driving plate and the pressing plate are lower than the top of the sealing lamination; the mounting holes on the sealing lamination are longitudinal waist-shaped holes, the mounting holes on the driving plate are transverse waist-shaped holes, so that warping compensation after heating is facilitated, the mounting holes on the partition plate, the base plate and the pressing plate are round matched with clamping bolts, and the clamping bolts sequentially penetrate through the mounting holes on the partition plate, the base plate, the sleeve and the pressing plate and are then fixed by nuts; one end close to the rotor center cylinder is an expansion starting end, the other end is a free end, the sleeve is positioned between the backing plate and the pressing plate of the free end and simultaneously penetrates through the longitudinal waist-shaped hole on the sealing lamination and the transverse waist-shaped hole on the driving plate, the clamping bolt of the free end sequentially penetrates through the baffle plate, the backing plate, the sleeve and the pressing plate and then is fixed by the nut, and the axial length of the sleeve is 1.5-2.5 mm greater than the sum of the thickness of the driving plate and the thickness of the sealing lamination. Thus, after the nut is locked, the driving plate and the sealing lamination still have a certain compensation space. The expansion starting end does not need to be provided with a sleeve, namely, at the expansion starting end, the clamping bolts sequentially penetrate through the partition plate, the base plate, the driving plate, the sealing lamination and the pressing plate and then are fixed by nuts.
The mounting holes on the partition plate, the base plate and the pressing plate are round holes matched with the clamping bolts, the outer diameter of the sleeve is smaller than the diameters of the mounting holes on the base plate and the pressing plate, namely, the sleeve can be positioned between the base plate and the pressing plate and cannot penetrate through the mounting holes of the base plate and the pressing plate.
The backing plate, the driving plate and the pressing plate are all arranged along the length direction of the sealing lamination. In the thickness direction, the baffle, the backing plate, the driving plate, the sealing lamination and the pressing plate are connected in sequence, and the baffle, the backing plate, the driving plate, the sealing lamination and the pressing plate are respectively provided with mounting holes corresponding to each other, so that clamping bolts can conveniently penetrate through the baffle, the backing plate, the driving plate, the sealing lamination and the pressing plate at the same time, and mounting is realized.
In order to better ensure the sealing effect, nuts on clamping bolts at the initial end of expansion are completely screwed down and fixed, and nuts on the rest clamping bolts are incompletely screwed down and fixed, so that the sealing lamination and the driving plate are heated and then are respectively and freely expanded towards the other end close to the angle steel at the outer edge of the rotor.
In order to better ensure the running stability and the sealing effect, two groups of driving mechanisms are arranged between the sealing lamination and the driving plate at the downstream of the expansion starting end, one group of driving mechanisms is close to the expansion starting end, and the other group of driving mechanisms is close to the free end; the driving mechanism comprises a driving center block, a lifting block and a contraction block; the driving center block is positioned between the jacking block and the shrinkage block, the driving center block is fixed on the driving plate, and the jacking block and the shrinkage block are both fixed on the sealing lamination.
The technology not particularly limited by the present utility model refers to the prior art.
The bimetal thermal compensation sealing device for the air preheater adopts a structure of combining the backing plate, the driving plate and the sealing lamination, combines the advantages of rigid sealing and flexible sealing, can effectively compensate the triangular air leakage area of the air preheater caused by heating, obviously reduces the air leakage rate of the air preheater, can elastically retract the sealing lamination once the air preheater is worn, does not need to be provided with a sealing hinge, a spring and other structures, has low noise, long service life, and is stable and safe to operate and easy to replace.
Drawings
FIG. 1 is a schematic installation diagram of a bimetal thermal compensation sealing device of an air preheater;
FIG. 2 is a front view of the bimetal thermal compensation sealing device of the air preheater of the present utility model;
FIG. 3 is an enlarged partial schematic view of the sealing device of FIG. 2 in accordance with the present utility model;
FIG. 4 is a side view of the bi-metallic thermal compensation seal of the air preheater of the present utility model;
FIG. 5 is a schematic view of the driving mechanism of the present utility model;
In the figure, 1 is a rotor central cylinder, 2 is a sector plate, 3 is a bimetal thermal compensation seal, 4 is a radial partition plate, 5 is a clamping bolt assembly (comprising clamping bolts and nuts), 6 is a driving mechanism, 7 is a sealing lamination, 8 is a driving plate, 9 is a sealing sheet, 10 is a sealing thick sheet, 11 is a backing plate, 12 is a nut, 13 is a clamping bolt, 14 is a pressing plate, 15 is a shrinkage block, 16 is a driving central block, 17 is a jacking block, A is an expansion starting end, and B is a free end.
Detailed Description
For a better understanding of the present utility model, the following examples are further illustrated, but are not limited to the following examples.
The orientation or positional relationship indicated by the present utility model such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Example 1
1-2, The bimetal thermal compensation sealing device of the air preheater is arranged on a hot end radial partition board of a rotor of the air preheater, one end of the bimetal thermal compensation sealing device is close to a rotor central cylinder, the other end of the bimetal thermal compensation sealing device is close to angle steel at the outer edge of the rotor, the bimetal thermal compensation sealing device at least comprises a sealing lamination and a driving plate, the sealing lamination and the driving plate are arranged along the thickness direction, the linear expansion coefficient of the driving plate is larger than that of the sealing lamination, and the driving plate also comprises a backing plate; on the thickness direction as shown in fig. 4, the separator, the backing plate, the driving plate and the sealing lamination are sequentially arranged along the thickness direction, the tops of the separator, the backing plate and the driving plate are lower than the top of the sealing lamination, the top of the backing plate is higher than the top of the separator, and the part of the top of the backing plate higher than the separator is bent away from the driving plate.
The pad is arranged in the embodiment, and the bending part is arranged at the part of the pad beyond the partition plate, so that the deformation resistance effect can be effectively achieved, and the service life of the device is prolonged; the setting of backing plate can cover burr, solder joint etc. on the baffle simultaneously, improves the stability of device. In practice, after multiple overhauls, the mounting holes on the partition plate can be enlarged, and the application is provided with the backing plate, and the standard design of the mounting holes on the backing plate improves the stability of the sealing device.
The drive plate has a linear expansion coefficient greater than the linear expansion coefficient of the seal stack. Like this, when being heated, can produce relative differential expansion between drive plate and the sealed lamination, sealed lamination produces upwarp deformation under the drive of drive plate, and then effectively compensates the air leakage clearance, and when sealed lamination upwarp excessive time, sealed lamination possesses buffering and transitional effect. The device does not adopt the structures such as a sealing hinge and a spring, but adopts the structure of combining the backing plate, the driving plate and the sealing lamination, has the characteristics of rigidity and flexibility, can effectively reduce the air leakage rate of the air preheater, and has the advantages of low noise, long service life and stable and safe operation.
Example 2
On the basis of example 1, the following modifications were further made: for the convenience of processing, as shown in fig. 4, the bending of the pad plate is one-time bending, and the bending angle of the pad plate is 45 °.
Example 3
On the basis of example 2, the following modifications were further made: the thickness of the backing plate is 2mm, and the backing plate is made of a metal material with the expansion coefficient deviation of not more than 30% from the partition plate. For example, the backing plate can be made of carbon steel. In order to achieve both the sealing effect and the workability, as shown in fig. 4, the seal laminate is formed by laminating a seal sheet and a seal thick sheet in the thickness direction, the thickness of the seal sheet is 1.5mm, the thickness of the seal thick sheet is 3mm, the bottom of the seal sheet is aligned with the bottom of the seal thick sheet, but the top of the seal sheet is 5mm higher than the top of the seal thick sheet.
Example 4
On the basis of example 3, the following modifications were further made: in order to further improve structural stability, the sealing thick plates are adjacent to the driving plate, and the sealing thin plates and the tops of the sealing thick plates are all provided with one-time bending at the same height, and the bending angle of the sealing thick plates is larger than that of the sealing thin plates. Thus, the sealing thick sheet can effectively support and strengthen the sealing thin sheet and can play a double sealing effect. In order to achieve both sealing effect and stability, the bending directions of the sealing thin sheet, the sealing thick sheet and the backing plate are the same; wherein, the bending angle of the sealing thick sheet and the sealing thin sheet is smaller than the bending angle of the backing plate. The bending angle of the backing plate is 45 degrees, the bending angle of the sealing thick sheet is 25 degrees, and the bending angle of the sealing thin sheet is 12 degrees.
Example 5
On the basis of example 4, the following modifications were further made: as shown in FIG. 4, in order to further improve stability and sealing effect, the bimetal thermal compensation sealing device of the air preheater further comprises a pressing plate, a clamping bolt and a sleeve; the baffle plate, the backing plate, the driving plate, the sealing lamination and the pressing plate are sequentially arranged along the thickness direction (the view in the thickness direction is shown in fig. 4), and the tops of the baffle plate, the backing plate, the driving plate and the pressing plate are lower than the top of the sealing lamination; the mounting holes on the sealing lamination are longitudinal waist-shaped holes, the mounting holes on the driving plate are transverse waist-shaped holes, so that warping compensation after heating is facilitated, the mounting holes on the partition plate, the base plate and the pressing plate are round matched with clamping bolts, and the clamping bolts sequentially penetrate through the mounting holes on the partition plate, the base plate, the sleeve and the pressing plate and are then fixed by nuts; one end close to the rotor center cylinder is an expansion starting end, the other end is a free end, the sleeve is positioned between the backing plate and the pressing plate of the free end and simultaneously penetrates through the longitudinal waist-shaped hole on the sealing lamination and the transverse waist-shaped hole on the driving plate, the clamping bolt of the free end sequentially penetrates through the baffle plate, the backing plate, the sleeve and the pressing plate and then is fixed by the nut, and the axial length of the sleeve is 1.5-2.5 mm greater than the sum of the thickness of the driving plate and the thickness of the sealing lamination. Thus, after the nut is locked, the driving plate and the sealing lamination still have a certain compensation space. The mounting holes on the partition plate, the base plate and the pressing plate are round holes matched with the clamping bolts, the outer diameter of the sleeve is smaller than the diameters of the mounting holes on the base plate and the pressing plate, namely, the sleeve can be positioned between the base plate and the pressing plate and cannot penetrate through the mounting holes of the base plate and the pressing plate. The expansion starting end does not need to be provided with a sleeve, and the clamping bolts of the expansion starting end sequentially penetrate through the partition plate, the base plate, the driving plate, the sealing lamination and the pressing plate and then are fixed by nuts.
Example 6
On the basis of example 5, the following modifications were further made: in order to better ensure the sealing effect, nuts on clamping bolts at the initial end of expansion are completely screwed down and fixed, and nuts on the rest clamping bolts are incompletely screwed down and fixed, so that the sealing lamination and the driving plate are heated and then are respectively and freely expanded towards one end close to the angle steel at the outer edge of the rotor.
Example 7
On the basis of example 6, the following modifications were further made: as shown in fig. 3 and 5, in order to better ensure the running stability and sealing effect, two sets of driving mechanisms are arranged between the sealing lamination and the driving plate downstream of the expansion start end, one set of driving mechanism is close to the expansion start end, and the other set of driving mechanism is close to the free end; the driving mechanism comprises a driving center block, a lifting block and a contraction block; the driving center block is positioned between the jacking block and the shrinkage block, the driving center block is fixed on the driving plate, and the jacking block and the shrinkage block are both fixed on the sealing lamination.
The bimetal thermal compensation sealing device for the air preheater adopts the structure of combining the backing plate, the driving plate and the sealing lamination, has the advantages of both rigid sealing and flexible sealing, can not only effectively compensate the triangular air leakage area of the air preheater caused by heating and obviously reduce the air leakage rate of the air preheater, but also can elastically retract the sealing lamination once being rubbed, does not need to be provided with a sealing hinge, a spring and other structures, has low noise, long service life, and is stable and safe to operate and easy to replace.
Claims (10)
1. The utility model provides a bimetal thermal compensation sealing device of air preheater installs on radial baffle (4) of the hot junction of air preheater rotor, and one end is close to rotor center section of thick bamboo (1), the other end is close to rotor outer fringe angle steel, includes at least seal lamination (7) and drive plate (8) that set up along thickness direction, and the linear expansion coefficient of drive plate (8) is greater than the linear expansion coefficient of seal lamination (7), its characterized in that: also comprises a backing plate (11); baffle, backing plate (11), drive plate (8) and sealed lamination (7) set gradually along thickness direction, and the top of baffle, backing plate (11) and drive plate (8) all is less than the top of sealed lamination (7), and backing plate (11) top is higher than the baffle top, and the part that backing plate (11) top exceeds the baffle is the bending of skew drive plate (8).
2. The air preheater bimetal thermal compensation sealing device of claim 1, wherein: the bending of the backing plate (11) is one-time bending, and the bending angle of the backing plate (11) is 35-60 degrees.
3. The air preheater bimetal thermal compensation sealing device as set forth in claim 1 or 2, wherein: the thickness of the backing plate (11) is 1-2mm, and the backing plate (11) is made of a metal material with the expansion coefficient deviation of not more than 30% from the partition plate.
4. The air preheater bimetal thermal compensation sealing device as set forth in claim 1 or 2, wherein: the sealing lamination (7) is formed by overlapping a sealing sheet (9) and a sealing thick sheet (10) along the thickness direction, the thickness of the sealing sheet (9) is 1-2mm, the thickness of the sealing thick sheet (10) is 2.5-3.5mm, the bottom of the sealing sheet (9) is aligned with the bottom of the sealing thick sheet (10), and the top of the sealing sheet (9) is 2-6mm higher than the top of the sealing thick sheet (10).
5. The air preheater bimetal thermal compensation sealing device of claim 4, wherein: the sealing thick sheet (10) is adjacent to the driving plate (8), the sealing thin sheet (9) and the top of the sealing thick sheet (10) are all provided with one-time bending at the same height, and the bending angle of the sealing thick sheet (10) is larger than that of the sealing thin sheet (9).
6. The air preheater bimetal thermal compensation sealing device of claim 5, wherein: the bending directions of the sealing thin sheet (9), the sealing thick sheet (10) and the backing plate (11) are the same; wherein the bending angle of the sealing thick sheet (10) and the sealing thin sheet (9) is smaller than that of the backing plate (11).
7. The air preheater bimetal thermal compensation sealing apparatus of claim 6, wherein: the bending angle of the backing plate (11) is 40-50 degrees, the bending angle of the sealing thick sheet (10) is 25-30 degrees, and the bending angle of the sealing thin sheet (9) is 15-20 degrees.
8. The air preheater bimetal thermal compensation sealing device as set forth in claim 1 or 2, wherein: the clamping device also comprises a pressing plate (14), a clamping bolt (13) and a sleeve; the partition board, the base plate (11), the driving plate (8), the sealing lamination (7) and the pressing plate (14) are sequentially arranged along the thickness direction, and the tops of the partition board, the base plate (11), the driving plate (8) and the pressing plate (14) are lower than the top of the sealing lamination (7); the mounting holes on the sealing lamination (7) are longitudinal waist-shaped holes, the mounting holes on the driving plate (8) are transverse waist-shaped holes, the mounting holes on the partition plate, the base plate (11) and the pressing plate (14) are round matched with the clamping bolts (13), and the clamping bolts (13) sequentially penetrate through the mounting holes on the partition plate, the base plate (11), the sleeve and the pressing plate (14) and then are fixed by nuts (12); one end close to the rotor center tube (1) is an expansion starting end (A), the other end is a free end (B), a sleeve is positioned between a backing plate (11) and a pressing plate (14) of the free end (B) and simultaneously penetrates through a longitudinal waist-shaped hole in the sealing lamination (7) and a transverse waist-shaped hole in the driving plate (8), a clamping bolt (13) of the free end (B) sequentially penetrates through a partition plate, the backing plate (11), the sleeve and the pressing plate (14) and then is fixed by a nut (12), and the axial length of the sleeve is larger than the thickness sum of the driving plate (8) and the sealing lamination (7) by 1.5-2.5 mm.
9. The air preheater bimetal thermal compensation sealing apparatus of claim 8, wherein: the nuts (12) on the clamping bolts (13) at the expansion starting end (A) are completely screwed and fixed, and the nuts (12) on the rest of the clamping bolts (13) are incompletely screwed and fixed, so that the sealing lamination (7) and the driving plate (8) are heated and then are respectively and freely expanded towards one end close to the angle steel at the outer edge of the rotor.
10. The air preheater bimetal thermal compensation sealing apparatus of claim 8, wherein: two groups of driving mechanisms (6) are arranged between the sealing lamination (7) and the driving plate (8) at the downstream of the expansion starting end (A), one group of driving mechanisms (6) is close to the expansion starting end (A), and the other group of driving mechanisms (6) is close to the free end (B); the driving mechanism (6) comprises a driving center block (16), a lifting block (17) and a contraction block (15); the driving center block (16) is positioned between the jacking block (17) and the shrinkage block (15), the driving center block (16) is fixed on the driving plate (8), and the jacking block (17) and the shrinkage block (15) are both fixed on the sealing lamination (7).
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| Application Number | Priority Date | Filing Date | Title |
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