CN210087992U

CN210087992U - Flue gas shaft sealing system

Info

Publication number: CN210087992U
Application number: CN201920940956.8U
Authority: CN
Inventors: 吉鸿祥; 赵剑
Original assignee: SHENYANG HUAJIAN GENERAL EQUIPMENT Co Ltd
Current assignee: SHENYANG HUAJIAN GENERAL EQUIPMENT Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-02-18
Anticipated expiration: 2029-06-21

Abstract

The utility model particularly relates to a flue gas shaft seal system. The problem of corrosion of the shaft seal of the smoke baffle door under different working conditions is solved, and the service life of the smoke baffle blade is prolonged. Comprises a stuffing box assembled on a shaft; the inner cavity of the stuffing box is wide in front and narrow in back; the stuffing box takes an oil seal framework as a gland, the oil seal framework is tightly plugged at the front end port of the wide part of the stuffing box, and when a shaft passes through the oil seal framework, the oil seal framework is tightly matched with the shaft or an alloy outer bushing of the shaft; an alloy inner bushing is arranged at the narrow part of the inner cavity of the stuffing box, a shaft penetrates into the stuffing box through the oil seal framework and penetrates out of the stuffing box from the alloy inner bushing, an O-shaped sealing ring for sealing is arranged at one end of the alloy inner bushing, which penetrates out of the shaft, and the O-shaped sealing ring is tightly pressed at the end part of the alloy inner bushing through a tetrafluoro pad; when the shaft penetrates through the stuffing box, a closed cavity is formed among the wide part of the inner cavity of the stuffing box, the oil seal framework and the sealing ring, and an oil filling hole communicated with the closed cavity is formed in the stuffing box.

Description

Flue gas shaft sealing system

Technical Field

The utility model relates to a flue gas shaft seal system, concretely relates to flue gas baffle shaft seal device.

Background

With the continuous improvement of national requirements for environmental protection, the flue gas emission index of the thermal heating industry also has higher requirements correspondingly. Therefore, professional skills are required to be improved correspondingly in all links from boiler combustion to flue gas emission to the atmosphere. Such as: the turn-off of the bypass flue gas damper is to facilitate personnel to enter the equipment when the equipment bypassed by the bypass is overhauled, and the flue gas needs to be completely blocked for the personal safety of the personnel. For another example: for a heating company with more than two boilers, if a plurality of boilers do not operate simultaneously, the flue gas baffle door between the operating boiler and the non-operating boiler is turned off to prevent flue gas generated by the operating boiler from flowing into the non-operating boiler, so that the standard exceeding flue gas is discharged into the atmosphere through a flue of the non-operating boiler, the atmosphere is polluted, and the environment is not up to the standard.

Therefore, the tightness of the smoke damper door when being turned off becomes a key factor for meeting environmental protection indexes and guaranteeing personal safety under various higher sealing requirements.

Among them, in the sealing of the flue gas baffle door, the sealing between the rotating shaft of the blade and the shaft sleeve, and between the shaft and the stuffing box is particularly critical. The flue gas in the boiler and the pipeline of the matched equipment contains more complex chemical components, but the content of the flue gas is more water, sulfur and the like. Different media corrode the smoke baffle door shaft, the shaft sleeve matched with the smoke baffle door shaft, the stuffing box and the like differently, so that the smoke baffle door is blocked when opened and closed, the service life is shortened, and the smoke baffle door cannot be used.

The traditional smoke damper smoke shaft sealing device is generally composed of a shaft and a stuffing box. As shown in fig. 1. The stuffing box is a cylindrical hollow barrel structure, the inner cavity of the barrel is wide in the front and narrow in the rear to form a wide part and a narrow part, the front end part of the stuffing box is sealed by a gland with a bolt, the assembled stuffing box device is sleeved on a shaft, and the stuffing box is tightly leaned against the shaft sleeve to form a shaft sealing system. And the stuffing box device forms a cavity at the wide part of the inner cavity of the cylinder after being matched with the shaft, and is used for adding sealing stuffing, and the stuffing adopts a graphite packing.

The above flue gas shaft sealing device of the flue gas baffle door has the following technical defects although the shaft sealing performance is achieved.

1. The quantity and the density of packing filled in the packing box can not be accurately controlled during assembly, the density is small, smoke is easy to leak, and the torque of the shaft can be increased due to the high density.

2. The inner surface of the stuffing box is easily corroded by low-temperature chemical acid, so that the stuffing box and the shaft are rusted and stuck to be unusable, which is shown in a point A in figure 1.

3. The front end face and the outer surface of the packing box, and the gland of the packing box and the shaft are affected by the environmental temperature difference and are easy to generate low-temperature condensation, so that the gland of the packing box and the shaft are corroded, and particularly refer to a point B in figure 1.

4. The inner surface of the stuffing box of the two

points

2 and 3 is corroded by low-temperature chemical acid, and the outer surface is corroded by environmental temperature difference condensation, so that the stuffing in the stuffing box is aged and hardened, and the stuffing box and a shaft are corroded, particularly referring to a point C in figure 1.

Therefore, as shown in fig. 2, the smoke baffle vane is normally in an open or closed state, the switching frequency is very low, and the A, B, C point is in static low-temperature condensation chemical acid corrosion for a long time, and finally the rotating shaft of the vane cannot rotate.

SUMMERY OF THE UTILITY MODEL

The utility model discloses be exactly to the defect that prior art exists, provide a flue gas shaft seal system, it is installed on the flapper door of individual layer blade to the effectual shortcoming that improves traditional flue gas baffle door-hinge sealing technique has perfected the sealed performance of flapper door-hinge, has overcome flue gas baffle door counter shaft seal's under different work condition states corrosion problems, has improved the life of flue gas baffle blade.

In order to achieve the purpose, the utility model adopts the following technical proposal that the device comprises a stuffing box assembled on a (rotating) shaft; and the inner cavity of the stuffing box is wide in front and narrow in back.

The oil seal packing box is characterized in that the oil seal framework is used as a gland and is tightly plugged at the front end port of the wide part of the packing box, and when a shaft passes through the oil seal framework, the oil seal framework is tightly matched with the shaft or an alloy outer bushing of the shaft.

An alloy inner bushing is arranged at the narrow part of the inner cavity of the stuffing box, the shaft penetrates into the stuffing box through the oil seal framework and penetrates out of the stuffing box from the alloy inner bushing, an O-shaped sealing ring for sealing is arranged at one end of the alloy inner bushing, which is penetrated out of the shaft, and the O-shaped sealing ring is tightly pressed at the end part of the alloy inner bushing through a tetrafluoro gasket.

When the shaft penetrates through the stuffing box, a closed cavity is formed among the wide part of the inner cavity of the stuffing box, the oil seal framework and the sealing ring, an oil filling hole communicated with the closed cavity is formed in the stuffing box, and lubricating grease is filled into the closed cavity through the oil filling hole.

As an optimized scheme of the utility model, the oil blanket skeleton be annular cover column structure, the axle is passed by this cover column structure, the oil blanket skeleton seals the one end of packing box tightly.

As another preferred scheme of the utility model, the oil blanket skeleton adopt the fluororubber material.

As another preferred scheme of the utility model, the oil filler point on be provided with the oil nozzle.

As another preferred scheme of the utility model, the oil filler point adopts the blast pipe bolt.

As another preferred embodiment of the present invention, the sealing ring is a fluororubber ring.

As another preferred embodiment of the present invention, the tetrafluoro pad is compressed to the end of the alloy inner liner of the stuffing box by a shaft sleeve.

Compared with the prior art the utility model discloses beneficial effect.

The utility model discloses install on the flue gas baffle door, it has changed the structure material of traditional flue gas baffle door-hinge sealing device, is changed high temperature lubricating grease oil seal by the packing to, has improved the axle leakproofness and the interaxial lubricating function of flue gas baffle blade.

The utility model discloses use on the flue gas baffle door, when the assembly, save twice process-packing and compress tightly the packing lid. And the oil seal framework is convenient to operate and easy to install, and saves manpower, materials and machining cost.

The utility model discloses it is sealed to change lubricating grease into by the packing, has both played the lubrication action of axle in the packing box, has also played superstrong sealed function, and fundamentally has solved flue gas flapper door at low temperature, and the technical problem of sealing, lubrication has prolonged its life under the operating mode of condensation acid corrosion, has great using value.

Drawings

The present invention will be further described with reference to the accompanying drawings and the following detailed description. The scope of protection of the present invention is not limited to the following description.

Fig. 1 is the sealing structure diagram between the traditional smoke baffle door spindle and the stuffing box of the utility model.

Figure 2 is a schematic view of a flue gas damper door to which the present invention is applied.

Fig. 3 is an enlarged view of a portion a in fig. 2 according to the present invention.

In the figure, 1 is a valve body, 2 is a stuffing box, 3 is a shaft, 4 is stuffing, 5 is a gland, 6 is a bolt, 7 is an alloy inner bushing, 8 is a tetrafluoro pad, 9 is a seal ring, 10 is an oil injection hole, 11 is an oil injection nozzle, 12 is an oil seal framework, 13 is an alloy outer bushing, 14 is lubricating grease, 15 is a blade, and 16 is a shaft sleeve.

Detailed Description

The utility model discloses an improvement of doing on prior art's basis, figure 2 is a flue gas flapper door, and the flue gas flapper door includes the frame and can be for the rotatory blade 15 of frame, and wherein, the frame is inlayed in the valve body 1 of flue gas flapper door (or called flue gas flapper valve), through axis of rotation 3, and blade 15 reaches the purpose of blocking the flue gas round the axis of rotation in the frame internal rotation. The utility model discloses be used for improving the leakproofness between axis of rotation 3, axle sleeve 16 and the stuffing box 2 promptly.

As shown in fig. 3, the present invention includes a stuffing box assembled on (rotating) shaft 3; and the inner cavity of the stuffing box 2 is wide in front and narrow in back. Wherein the stuffing box 2 is fixed on the valve body 1.

The stuffing box 2 takes an oil seal framework 12 as a gland 5, the gland is tightly plugged at the front end port of the wide part of the stuffing box 2, and when the shaft 3 passes through the oil seal framework 12, the oil seal framework 12 is tightly matched with the shaft 3 or an alloy outer bushing 13 of the shaft; an alloy inner bushing 7 is arranged at the narrow part of the inner cavity of the stuffing box, a shaft penetrates into the stuffing box 2 through an oil seal framework 12 and penetrates out of the stuffing box from the alloy inner bushing 7, an O-shaped sealing ring 9 for sealing is arranged at one end, penetrating out of the shaft, of the alloy inner bushing 7, and the O-shaped sealing ring 9 is tightly pressed at the end part of the alloy inner bushing 13 through a tetrafluoro gasket 8 (tetrafluoro gasket); when the shaft 3 penetrates through the stuffing box 2, a closed cavity is formed among the wide part of the inner cavity of the stuffing box, the oil seal framework 12 and the sealing ring 9, an oil filling hole 10 communicated with the closed cavity is formed in the stuffing box, and the oil filling hole 10 is used for filling lubricating grease 14 into the closed cavity.

Preferably, the oil seal framework 12 is an annular sleeve-shaped structure, a shaft passes through the sleeve-shaped structure, and the oil seal framework tightly seals one end of the stuffing box.

Preferably, the oil seal framework 12 is made of fluororubber.

Preferably, the oil filling hole 10 is provided with an oil filling nozzle 11.

Preferably, the oil injection hole 10 is an exhaust pipe bolt.

Preferably, the sealing ring 9 is a fluorine rubber ring.

Preferably, the tetrafluoro pad 8 is compressed outside the stuffing box by a bushing, and the bushing 16 is connected with the blade 15.

Specifically, 1, this shaft seal system, by oil blanket skeleton 12 replace prior art's gland 5, oil blanket skeleton 12 is made by high temperature fluororubber material, closely cooperates when assembling with the outer bush alloy sleeve pipe of axle (alloy outer bush 13), can bear the low temperature condensation under the various operating modes, low temperature acid corrosion, has improved B point axle sealing performance. The shaft 3 with the stainless steel sleeve can rotate freely and never be rusted. Meanwhile, when the smoke baffle door is assembled, the shaft sealing system does not need two processes of packing and packing 4 and pressing the gland 5, so that the labor is saved, the material is saved, and the machining cost is reduced.

2. An O-shaped fluororubber ring (a sealing ring 9) is added at the joint of the front end (the rear end of the stuffing box) of a shaft sleeve 16 of a rotating shaft of a smoke damper door, is embedded on the inner circle (the shaft end near) of an alloy lining sleeve 7 of the stuffing box 2, and is compressed by a PTFE gasket 8. During assembly, the stuffing box 2 is tightly matched with the shaft 3 which is lined with the stainless steel sleeve outside, so that the flue gas flow rate in the baffle door can be borne, and the sealing problem of the shaft sealing device at the point A due to wind pressure low-temperature acid corrosion is solved.

3. After the shaft 3 lined with the stainless steel sleeve is assembled with the stuffing box device, a closed cavity is formed between the shaft 3 and the stuffing box device and is used for adding stuffing 14, after the stuffing is injected from the oil injection nozzle 11, the exhaust hole bolt (oil injection hole 10) is opened, and after the oil is filled, the exhaust hole is locked. And C, filling lubricating grease. A lubricating grease film is formed between the alloy inner bushing 7 and the alloy outer bushing 13 (0.02 mm) of the A-point stuffing box, so that the technical problem of corrosion between the A-point stuffing box 2 and the shaft 3 is solved.

More specifically, the utility model discloses a stuffing box structure is the same with current technique, is similar to cylindrical hollow tube structure, and interior surface machining goes out a step, makes front end and rear end thickness different, and the front end is thin, and the rear end is thick. During assembly, the stainless steel sleeve (alloy inner bushing 7) lined in the stuffing box is lined at the rear end of the inner side of the stuffing box 2 and aligned with the rear end. The front end is provided with an oil seal framework 12. The stuffing box 2 behind the inner lining, the shaft 3 behind the outer lining and the oil seal framework 12 form a cavity for adding the stuffing 14, lubricating grease is injected from the oil injection nozzle 11, after the cavity is filled with the lubricating grease, the exhaust hole is automatically sealed to form the stuffing box device, an arc groove is processed at the rear end of the stuffing box lining alloy sleeve (the alloy inner bushing 7) at the rear end of the device close to the shaft side, the O-shaped fluororubber ring 9 is clamped into the groove and is internally hooped on the shaft 3 behind the outer lining alloy sleeve, and the rear end is pressed by the tetrafluoro cushion 8 and is extruded at the front end of the shaft sleeve 16 at the rear end. The shaft sealing system is completed.

It should be understood that the above detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.

Claims

1. A flue gas shaft seal system comprising a stuffing box fitted over a shaft; the inner cavity of the stuffing box is wide in front and narrow in back; the oil seal packing box is characterized in that an oil seal framework is used as a gland and is tightly plugged in the front end port of the wide part of the packing box, and when a shaft passes through the oil seal framework, the oil seal framework is tightly matched with the shaft or an alloy outer bushing of the shaft;

an alloy inner bushing is arranged at the narrow part of the inner cavity of the stuffing box, a shaft penetrates into the stuffing box through the oil seal framework and penetrates out of the stuffing box from the alloy inner bushing, an O-shaped sealing ring for sealing is arranged at one end of the alloy inner bushing, which penetrates out of the shaft, and the O-shaped sealing ring is tightly pressed at the end part of the alloy inner bushing through a tetrafluoro pad;

2. The flue gas shaft seal system of claim 1 wherein: the oil seal framework is of an annular sleeve-shaped structure, a shaft penetrates through the sleeve-shaped structure, and one end of the packing box is tightly sealed by the oil seal framework.

3. The flue gas shaft seal system of claim 1 wherein: the oil seal framework is made of fluororubber.

4. The flue gas shaft seal system of claim 1 wherein: and an oil filling nozzle is arranged on the oil filling hole.

5. The flue gas shaft seal system of claim 1 wherein: the oil filling hole adopts an exhaust pipe bolt.

6. The flue gas shaft seal system of claim 1 wherein: the sealing ring is a fluororubber ring.

7. The flue gas shaft seal system of claim 1 wherein: the tetrafluoro pad is pressed on the end part of the alloy inner bushing of the stuffing box by a shaft sleeve.