CN205745303U

CN205745303U - The open elastic sealing device of air preheater

Info

Publication number: CN205745303U
Application number: CN201620429279.XU
Authority: CN
Inventors: 徐凤奎; 何庆中; 郑纯刚; 赵献丹; 王俊; 陈增宏
Original assignee: ZIGONG DONGAN POWER STATION EQUIPMENT MANUFACTURING Co Ltd; Sichuan University of Science and Engineering
Current assignee: ZIGONG DONGAN POWER STATION EQUIPMENT MANUFACTURING Co Ltd; Sichuan University of Science and Engineering
Priority date: 2016-05-12
Filing date: 2016-05-12
Publication date: 2016-11-30
Anticipated expiration: 2026-05-12

Abstract

The utility model discloses a kind of open elastic sealing device of air preheater, including seat board, flexible member and sealing plate, it is characterized in that described flexible member includes more than the two sections corrugated platings overlapped, one end of adjacent two sections of corrugated platings couples and connects firmly with the U-board outside this end, be positioned at the corrugated plating of a lateral edges and described sealing plate one end couple and connect firmly with the U-board outside this end, sealing plate one section be obliquely installed, one end of the corrugated plating and seat board that are positioned at opposite side edge couples and connects firmly with the U-board outside this end.This utility model not only this compact conformation is simple, and sealing member is connected as a single entity with flexible member, deforms less, can avoid coming off and catching phenomenon of sealing member, it is ensured that long-time normal work.

Description

The open elastic sealing device of air preheater

Technical field

This utility model relates to a kind of elastic sealing device for air preheater.

Background technology

Rotary regenerative air preheater is the heat-exchange apparatus of large coal-fired boiler, and it utilizes the heat of boiler smoke to heat the air needed for burning, improves the thermal efficiency of boiler with this.During operation, the temperature of air preheater upper end flue gas is higher than lower end, the swell increment of rotor upper end is more than lower end, adds the effect of deadweight, and rotor can become " mushroom ", seal clearance between rotor and fanning strip can change, upper gap becomes big, and underclearance diminishes, and causes sealing to reduce, air leak rate of air curtain increases, and affects the thermal efficiency that boiler combustion runs；Gap diminishes, and will increase the resistance between rotor and fanning strip, fanning strip serious wear, shortens air preheater non-failure operation time, increases and safeguard use cost, so, the Sealing Technology of air preheater and seal structure, is the key technology of each air preheater.Leaking out of air preheater is mainly made up of two parts, directly leaks out and carries and leaks out.Directly leaking out and account for the 70%-80% of total inleakage, the gap between upper and lower fanning strip and the rotor cold end radial seal of heat is the main portions directly leaked out, and accounts for the 70%-80% of direct inleakage, and therefore radial seal is the main cause causing air-heater leakage.Radial seal structure is generally divided into non-contacting seal and two kinds of forms of contact seal.Contactless radial seal is that fanning strip is used automatic or manual guiding mechanism, wherein top sealing sector plate uses automatic adjustment mode mostly, bottom realizes the adjustment of seal clearance frequently with the most periodically adjustment mode, the operation principle of this sealing structure is to be provided with adjustment actuator on air preheater fanning strip, according to fanning strip and the detection real-time to seal clearance of gyroaxis gap detection device, the change of the most hot running clearance is beyond setting value, actuator action, the adjustment fanning strip working clearance reaches to design seal clearance, its sealing property is made to reach optimum state.The type sealing device part electricity power enterprise boiler operatiopn sealing property at home was preferable in recent years, but structure is complicated, and the operating condition of air preheater is required height, the most domestic operating experience is not enough, maintenance safeguard does not catches up with, and causes operational reliability the highest, and maintenance and repair cost is high.Contact radial seal technology is to arrange radial spring seal device on Sectorial sealplate, and sealing member contacts sealing with gyroaxis, and has contact adaptivity.When air preheater runs, once form seal clearance or seal interference, flexible member self-adaptive recovery or compression, it is ensured that with Sectorial sealplate laminating degree, reach seal request.Owing to this compact conformation is simple, without complicated guiding mechanism, in theory without seal clearance, air preheater rotor roundness and thermal deformation are required relatively low, good sealing effect, reliability is high, maintenance cost is low, has obtained extensively approval and the favorable comment of station boiler electricity power enterprise, but the sealing member of this device separates with flexible member, deformation of elastic element is relatively big, and sealing member and flexible member existence come off and catching phenomenon.

Summary of the invention

The purpose of this utility model is for deficiencies of the prior art, a kind of open elastic sealing device of air preheater is provided, it not only this compact conformation simple, and sealing member is connected as a single entity with flexible member, deform less, coming off and catching phenomenon of sealing member can be avoided, it is ensured that long-time normal work.

For reaching above-mentioned purpose, a kind of open elastic sealing device of air preheater of the present utility model, including seat board, flexible member and sealing plate, it is characterized in that described flexible member includes more than the two sections corrugated platings overlapped, one end of adjacent two sections of corrugated platings couples and connects firmly with the U-board outside this end, be positioned at the corrugated plating of a lateral edges and described sealing plate one end couple and connect firmly with the U-board outside this end, sealing plate one section be obliquely installed, one end of the corrugated plating and seat board that are positioned at opposite side edge couples and connects firmly with the U-board outside this end；

During use, seat board is fixed on hot junction or the cold end of rotor storehouse lattice, contacts with the neighbouring surface of corresponding fanning strip under the effect of the flexible member that sealing plate forms corrugated plating, forms contact and seals；When the radial clearance in hot junction or cold end changes, under the effect of the flexible member of corrugated plating composition, it is ensured that sealing plate is adjacent to fanning strip all the time, it is achieved the automatic compensation in gap, thus reach the sealing effectiveness of zero clearance；This utility model not only this compact conformation is simple, and sealing plate is connected as a single entity with flexible member, can avoid coming off and catching phenomenon of sealing member, it is ensured that long-time normal work；Each U-board both can increase linking intensity, can prevent again the union end of correspondence from being washed away by the dust in flue gas, it is to avoid union end comes off；The sealing plate being obliquely installed is little with the contact surface of fanning strip, therefore weares and teares less, has longer service life；

As further improvement of the utility model, every section of corrugated plating all includes the two panels corrugated plating of overlapping；The two panels corrugated plating of every section of corrugated plating when moving up and down can phase mutual friction, absorb energy, improve the stability in shock absorbing process, Reducing distortion；

As further improvement of the utility model, the corrugated plating U-board with sealing plate union end is also fixedly connected with backplate, backplate be positioned at sealing plate sealing surface side；When seat board is fixed on the hot junction of rotor storehouse lattice, corrugated plating and sealing plate union end washed away the most serious by dust in flue gas, the backplate at this can reduce U-board and sealing plate abrasion, be further ensured that long-time normal work；

As further improvement of the utility model, sealing plate the back side of tilting section sealing surface side be fixedly connected with wing plate；Wing plate can play certain lateral seal effect, can improve simultaneously sealing plate rigidity；

In sum, this utility model not only this compact conformation is simple, and sealing member is connected as a single entity with flexible member, deforms less, can avoid coming off and catching phenomenon of sealing member, it is ensured that long-time normal work.

Accompanying drawing explanation

Fig. 1 is the front view of this utility model embodiment.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model is described in further detail.

As shown in Figure 1, the open elastic sealing device of air preheater of this embodiment, including seat board 1, flexible member and sealing plate 2, described flexible member includes seven sections of corrugated platings overlapped 3, every section of corrugated plating 3 all includes the two panels corrugated plating 4 and 5 of overlapping, one end of adjacent two sections of corrugated platings 3 is connected firmly by spot welding link and with the U-board 6 outside this end by spot welding and rivet, it is positioned at the corrugated plating 3 of a lateral edges and one end of described sealing plate 2 and is connected firmly by spot welding and rivet by spot welding link and with the U-board 7 outside this end, U-board 7 is also fixedly connected with backplate 9, backplate 9 is positioned at the sealing surface side of sealing plate 2, one section of sealing plate 2 is obliquely installed, it is fixedly connected with wing plate 10 at the back side of the tilting section sealing surface side of sealing plate 2；It is positioned at the corrugated plating 3 at opposite side edge and one end of seat board 1 and is connected firmly by spot welding and rivet by spot welding link and with the U-board 8 outside this end；

During use, seat board 1 is fixed on hot junction or the cold end of rotor storehouse lattice, contacts with the neighbouring surface of corresponding fanning strip under the effect of the flexible member that sealing plate 2 forms at each corrugated plating 3, forms contact and seals；When the radial clearance in hot junction or cold end changes, under the effect of the flexible member of corrugated plating 3 composition, it is ensured that sealing plate 2 is adjacent to fanning strip all the time, it is achieved the automatic compensation in gap, thus reach the sealing effectiveness of zero clearance；This utility model not only this compact conformation is simple, and sealing plate 2 is connected as a single entity with flexible member, can avoid coming off and catching phenomenon of sealing member, it is ensured that long-time normal work；Each U-board 6,7,8 both can increase linking intensity, can prevent again the union end of correspondence from being washed away by the dust in flue gas, it is to avoid union end comes off；The sealing plate 2 being obliquely installed is little with the contact surface of fanning strip, therefore weares and teares less, has longer service life；The two panels corrugated plating 4,5 of every section of corrugated plating 3 when moving up and down can phase mutual friction, absorb energy, improve the stability in shock absorbing process, Reducing distortion；When seat board 1 is fixed on the hot junction of rotor storehouse lattice, corrugated plating 3 is washed away the most serious with the union end of sealing plate 2 by dust in flue gas, backplate 9 at this can reduce U-board 7 and the abrasion of sealing plate 2, prevents the damage of U-board 7, comes off, and is further ensured that long-time normal work；Wing plate 10 can play certain lateral seal effect, can improve the rigidity of sealing plate 2 simultaneously.

Claims

1. the open elastic sealing device of air preheater, including seat board, flexible member and sealing plate, it is characterized in that described flexible member includes more than the two sections corrugated platings overlapped, one end of adjacent two sections of corrugated platings couples and connects firmly with the U-board outside this end, be positioned at the corrugated plating of a lateral edges and described sealing plate one end couple and connect firmly with the U-board outside this end, sealing plate one section be obliquely installed, one end of the corrugated plating and seat board that are positioned at opposite side edge couples and connects firmly with the U-board outside this end.

2. the open elastic sealing device of air preheater as claimed in claim 1, it is characterised in that every section of corrugated plating all includes the two panels corrugated plating of overlapping.

3. the open elastic sealing device of air preheater as claimed in claim 1 or 2, it is characterised in that be also fixedly connected with backplate in the corrugated plating U-board with sealing plate union end, backplate be positioned at sealing plate sealing surface side.

4. the open elastic sealing device of air preheater as claimed in claim 3, it is characterised in that sealing plate the back side of tilting section sealing surface side be fixedly connected with wing plate.