CN215725354U

CN215725354U - Sealing device of flexible air preheater with spring

Info

Publication number: CN215725354U
Application number: CN202022947948.1U
Authority: CN
Inventors: 高银春; 陆希凯
Original assignee: Jiangsu Huaxi Energy Saving Equipment Co ltd
Current assignee: Jiangsu Huaxi Energy Saving Equipment Co ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2022-02-01
Anticipated expiration: 2030-12-11

Abstract

The utility model relates to a sealing device of a spring flexible air preheater, which comprises a roller device (1), a spring device (2), a sealing plate (3) and a fixing plate (4) which are rotationally connected through a hinge structure (5), wherein the hinge structure (5) comprises a hinge shaft (6) and a hinge shaft sleeve (7) sleeved on the hinge shaft, and the hinge shaft sleeve (7) is respectively connected with the sealing plate (3) and the fixing plate (4) in a welding manner, and is characterized in that: spring assembly (2) contain supporting seat (2.1), lower support seat (2.2), go up spring holder (2.3), lower spring holder (2.4), well core rod (2.5) and spring (2.6). The utility model thoroughly avoids the lateral bending phenomenon of the spring, greatly prolongs the service life of the spring, is convenient to replace the spring, and has simple integral structure, long service life and low cost.

Description

Sealing device of flexible air preheater with spring

Technical Field

The utility model relates to a sealing device of a spring flexible air preheater, and belongs to the technical field of rotary heat exchangers.

Background

Coal fired boiler's air heater adopts rotary air heater to improve flue gas heat utilization ratio more, because rotary air heater itself is a rotating machinery, there is certain clearance between the sound, because be the malleation at the air side, the flue gas side is the negative pressure, the air can pass through closing plate and sector plate, the clearance between the arc is to the flue gas side direct leakage, still lost the heat when increasing forced draught blower and draught fan power consumption, thereby influence whole boiler efficiency, consequently the air leakage rate is lower, boiler efficiency is higher.

In order to reduce the air leakage rate, related units in China have successively proposed the sealing device of multiple structural style at present, and traditional has fixed brush seal, friction formula flexible seal and roll formula flexible seal, can both reduce the air leakage rate through transforming, but these several kinds of seals are all not durable: the service life of the fixed brush type seal is only 2 years (eliminated at present); the friction type flexible seal has large running resistance, the whole component of the sealing element is heavy, the current of the rotating motor is easy to overload, the rotating motor needs to be integrally replaced after the service life is 3-4 years, and the maintenance cost is high;

the rolling type flexible seal is superior to the rolling type flexible seal and the service life of the rolling type flexible seal depends on the service life of the spring and the service life of the roller, the spring is axially fixed at two ends, the axial direction of the spring cannot be matched with the compression direction of the spring when the spring is compressed, the spring is repeatedly bent laterally to cause premature failure of the spring at high temperature, the failed spring falls into an air preheater and can cause more serious equipment faults, and the difficulty in equipment maintenance is increased.

The structure of the spring with two movable ends disclosed in chinese patent No. 201920913315.3 improves the disadvantages of the original fixed spring structure, but still cannot completely eliminate the lateral bending phenomenon that the middle part of the spring deviates from the axis of the spring when the spring is compressed by a large force.

Disclosure of Invention

The utility model aims to overcome the defects and provide the flexible sealing device of the air preheater, which has the advantages of long service life of the spring, long service life of the whole air preheater and low cost.

The purpose of the utility model is realized as follows:

a sealing device of a flexible spring air preheater comprises a roller device, a spring device, a sealing plate and a fixing plate which are rotatably connected through a hinge structure, wherein the hinge structure comprises a hinge shaft and a hinge shaft sleeve sleeved on the hinge shaft, and the hinge shaft sleeve is respectively connected with the sealing plate and the fixing plate in a welding manner; the spring device comprises an upper supporting seat, a lower supporting seat, an upper spring seat, a lower spring seat, a central rod and a spring; the upper supporting seat and the lower supporting seat are respectively welded and installed on the sealing plate and the fixing plate; the top end of the central rod is hinged to the upper supporting seat through a pin shaft, an upper spring seat is fixedly sleeved on the upper part of the central rod, and the lower part of the central rod is slidably embedded in an axial through hole of the lower spring seat; the lower spring seat is hinged with the lower support seat through a positioning pin arranged on the edge of the lower spring seat; the spring is sleeved on the central rod, and two ends of the spring are respectively contacted with the upper spring seat and the lower spring seat;

the utility model relates to a sealing device of a spring flexible air preheater, which comprises a roller fixing seat, a bolt and a roller; the roller fixing seat is welded at the top of the sealing plate, and the roller is arranged on the roller fixing seat in a rolling manner through a bolt; the height of the top surface of the excircle of the roller is slightly higher than the top edge of the sealing plate;

the utility model relates to a sealing device of a rolling type spring flexible air preheater, wherein a positioning pin on a lower spring seat is replaced by a pin shaft, a long waist hole is formed in the lower part of a central rod, and the pin shaft of the lower spring seat is arranged in the long waist hole in a penetrating manner;

the utility model relates to a sealing device of a rolling type spring flexible air preheater, wherein the bottom of a sealing plate is a bevel and is sleeved with two welding positions with a hinge shaft; the bottom of the fixed plate is provided with an L-shaped bevel, the top of the fixed plate is provided with a bevel structure, and the bevel at the top of the fixed plate and the hinge shaft sleeve are provided with two welding positions;

the utility model relates to a sealing device of a rolling type spring flexible air preheater, wherein a spring is made of Hastelloy materials;

according to the sealing device of the rolling type spring flexible air preheater, the pin shaft and the positioning pin are replaced by bolts.

When the heat exchanger works, the fixed plate is fixedly arranged on a rotor partition plate of the heat exchanger, the sealing plate is respectively contacted with the sector plate and the arc plate of the heat exchanger through the idler wheels, when the heat expansion and cold contraction deformation occur in the working process, the idler wheels on the sealing plate are ensured to always cling to the surfaces of the sector plate and the arc plate to move by the spring of the spring device, and the gaps among the sealing plate, the sector plate and the arc plate are ensured to be stable, so that the low air leakage rate is ensured;

the central rod is arranged in the middle of the spring, so that the lateral bending phenomenon possibly occurring in the middle of the spring when the spring is compressed is completely avoided, and the service life of the spring is prolonged; even if the spring life normally expires and the fracture, cracked spring still can overlap on well core rod, can not drop to other places of heat exchanger at will, and no equipment potential safety hazard need only pull down the spring holder moreover and can conveniently change the spring, extension whole sealing device's life.

Compared with the prior art, the utility model has the beneficial effects that:

the center rod is arranged in the center of the spring, so that the side bending phenomenon of the spring is completely avoided, the service life of the spring is greatly prolonged, additional equipment faults cannot be caused even if the spring is broken, the overhaul and maintenance burden cannot be increased, the spring is convenient to replace, and the spring has the advantages of simple integral structure, long service life and low cost.

Drawings

Fig. 1 is a schematic view of an assembly structure of a sealing device of a spring flexible air preheater of the utility model.

Fig. 2 is a schematic view of a lower spring seat mounting structure of the sealing device of the flexible spring air preheater of the utility model.

Fig. 3 is a schematic structural view of a scheme that a long waist hole is formed in a center rod of the sealing device of the spring flexible air preheater.

Fig. 4 is a schematic view of a lower spring seat mounting structure of a scheme of arranging a long waist hole in a center rod of the sealing device of the flexible air preheater for a spring of the utility model.

Fig. 5 is a schematic side sectional structure view of a scheme of arranging a long waist hole in a center rod of the sealing device of the spring flexible air preheater of the utility model.

Fig. 6 is a schematic view of a compressed-state lateral cross-sectional structure of a sealing device of a spring flexible air preheater provided with a long waist hole in a center rod.

Wherein:

the hinge comprises a roller device 1, a spring device 2, a sealing plate 3, a fixing plate 4, a hinge structure 5, a hinge shaft 6 and a hinge shaft sleeve 7;

the roller fixing seat 1.1, the bolt 1.2 and the roller 1.3;

the support device comprises an upper support seat 2.1, a lower support seat 2.2, an upper spring seat 2.3, a lower spring seat 2.4, a central rod 2.5, a spring 2.6, a pin shaft 2.7, a positioning pin 2.8 and a long waist hole 2.9.

Detailed Description

Referring to fig. 1 to 6, the sealing device for the flexible spring air preheater comprises a roller device 1, a spring device 2, a sealing plate 3 and a fixing plate 4 which are rotatably connected through a hinge structure 5, wherein the hinge structure 5 comprises a hinge shaft 6 and a hinge shaft sleeve 7 sleeved on the hinge shaft, and the hinge shaft sleeve 7 is respectively connected with the sealing plate 3 and the fixing plate 4 in a welding manner; the spring device 2 comprises an upper supporting seat 2.1, a lower supporting seat 2.2, an upper spring seat 2.3, a lower spring seat 2.4, a central rod 2.5 and a spring 2.6; the upper supporting seat 2.1 and the lower supporting seat 2.2 are respectively welded and installed on the sealing plate 3 and the fixing plate 4; the top end of the central rod 2.5 is hinged to the upper supporting seat 2.1 through a pin shaft 2.7, an upper spring seat 2.3 is fixedly sleeved on the upper part of the central rod 2.5, and the lower part of the central rod 2.5 is slidably embedded in an axial through hole of the lower spring seat 2.4; the lower spring seat 2.4 is hinged with the lower support seat 2.2 through a positioning pin 2.8 arranged on the edge of the lower spring seat 2.4; the spring 2.6 is sleeved on the central rod 2.5, and two ends of the spring 2.6 are respectively contacted with the upper spring seat 2.3 and the lower spring seat 2.4;

further, the roller device 1 comprises a roller fixing seat 1.1, a bolt 1.2 and a roller 1.3; the roller fixing seat 1.1 is welded and installed at the top of the sealing plate 3, and the roller 1.3 is installed on the roller fixing seat 1.1 in a rolling mode through a bolt 1.2; the height of the top surface of the excircle of the roller 1.3 is slightly higher than the top edge of the sealing plate 3;

further, a positioning pin 2.8 on the lower spring seat 2.4 is replaced by a pin 2.7, a long waist hole 2.9 is formed in the lower portion of the central rod 2.5, and the pin 2.7 of the lower spring seat 2.4 penetrates through the long waist hole 2.9;

furthermore, the bottom of the sealing plate 3 is a bevel and is provided with two welding positions with the hinge shaft sleeve 7; the bottom of the fixed plate 4 is an L-shaped bevel, the top of the fixed plate 4 is a bevel structure, and the bevel at the top of the fixed plate 4 and the hinge shaft sleeve 7 are provided with two welding positions;

further, the spring 2.6 is made of hastelloy materials;

further, the pin shaft 2.7 and the positioning pin 2.8 are replaced by bolts.

When the heat exchanger works, the fixing plate 4 is fixedly arranged on a rotor partition plate of the heat exchanger, the sealing plate 3 is respectively contacted with the sector plate and the arc plate of the heat exchanger through the roller 1.3, when the heat expansion and cold contraction deformation occurs in the working process, the spring 2.6 of the spring device 2 ensures that the roller 1.3 on the sealing plate 3 always clings to the surfaces of the sector plate and the arc plate to move, and ensures that the gap between the sealing plate 3 and the sector plate and the arc plate is stable, thereby ensuring the low air leakage rate;

the central rod 2.5 is arranged in the middle of the spring 2.6, so that the lateral bending phenomenon possibly occurring in the middle of the spring 2.6 when the spring is compressed is completely avoided, and the service life of the spring 2.6 is prolonged; even the spring 2.6 life-span normally expires and the fracture, cracked spring still can overlap on well core rod 2.5, can not drop to other places of heat exchanger at will, and no equipment potential safety hazard need only pull down spring holder 2.4 moreover and can conveniently change spring 2.6, extension whole sealing device's life.

In addition: it should be noted that the above-mentioned embodiment is only a preferred embodiment of the present patent, and any modification or improvement made by those skilled in the art based on the above-mentioned conception is within the protection scope of the present patent.

Claims

1. The utility model provides a flexible air preheater sealing device of spring, contains gyro wheel device (1), spring assembly (2), rotates closing plate (3) and fixed plate (4) of connecting through hinge structure (5), hinge structure (5) contain hinge axle (6) and suit at epaxial hinge axle sleeve (7) of hinge, hinge axle sleeve (7) respectively with closing plate (3) and fixed plate (4) welded connection, its characterized in that: the spring device (2) comprises an upper supporting seat (2.1), a lower supporting seat (2.2), an upper spring seat (2.3), a lower spring seat (2.4), a central rod (2.5) and a spring (2.6); the upper supporting seat (2.1) and the lower supporting seat (2.2) are respectively welded and installed on the sealing plate (3) and the fixing plate (4); the top end of the central rod (2.5) is hinged to the upper supporting seat (2.1) through a pin shaft (2.7), an upper spring seat (2.3) is fixedly sleeved on the upper part of the central rod (2.5), and the lower part of the central rod (2.5) is slidably embedded in an axial through hole of the lower spring seat (2.4); the lower spring seat (2.4) is hinged with the lower support seat (2.2) through a positioning pin (2.8) arranged on the edge of the lower spring seat (2.4); the spring (2.6) is sleeved on the central rod (2.5), and two ends of the spring (2.6) are respectively contacted with the upper spring seat (2.3) and the lower spring seat (2.4).

2. The spring flexible air preheater sealing arrangement of claim 1, wherein: the roller device (1) comprises a roller fixing seat (1.1), a bolt (1.2) and a roller (1.3); the roller fixing seat (1.1) is welded at the top of the sealing plate (3), and the roller (1.3) is arranged on the roller fixing seat (1.1) in a rolling manner through a bolt (1.2); the height of the top surface of the excircle of the roller (1.3) is slightly higher than the top edge of the sealing plate (3).

3. The spring flexible air preheater sealing arrangement of claim 1, wherein: the locating pin (2.8) on the lower spring seat (2.4) is replaced by a pin shaft (2.7), the lower part of the central rod (2.5) is provided with a long waist hole (2.9), and the pin shaft (2.7) of the lower spring seat (2.4) penetrates through the long waist hole (2.9).

4. The spring flexible air preheater sealing arrangement of claim 1, wherein: the bottom of the sealing plate (3) is a bevel and is provided with two welding positions with the hinge shaft sleeve (7); the bottom of the fixing plate (4) is an L-shaped bevel, the top of the fixing plate is a bevel structure, and the bevel at the top of the fixing plate (4) and the hinge shaft sleeve (7) are provided with two welding positions.

5. The spring flexible air preheater sealing arrangement of claim 1, wherein: the spring (2.6) is made of Hastelloy.

6. The spring flexible air preheater sealing arrangement of claim 1, wherein: the pin shaft (2.7) and the positioning pin (2.8) are replaced by bolts.