CN101776279A

CN101776279A - Supporting and center fixing structure of rotor of miniature rotary air preheater

Info

Publication number: CN101776279A
Application number: CN200910197464A
Authority: CN
Inventors: 张渐明; 张建国; 蔡明坤; 沈建新
Original assignee: Shanghai Boiler Works Co Ltd
Current assignee: Shanghai Boiler Works Co Ltd
Priority date: 2009-10-21
Filing date: 2009-10-21
Publication date: 2010-07-14
Anticipated expiration: 2029-10-21
Also published as: CN101776279B

Abstract

The invention provides a supporting and center fixing structure of a rotor of a miniature rotary air preheater, which is characterized in that the supporting and center fixing structure comprises a rail plate and a transmission shroud ring, wherein the rail plate is arranged at the lower end of the side surface of the rotor, the transmission shroud ring is arranged at the upper side of the rail plate, the upper end of the side surface of a supporting tube body positioned at the lower side of the rotor is provided with a bottom plate, the inner side of the supporting tube body corresponding to the position of the bottom plate is provided with a supporting post, the bottom plate is fixed to the supporting post, a pin shaft is arranged on the bottom plate, the pin shaft is connected with a first rolling wheel through a rolling bearing, the first rolling wheel is arranged under the rail plate, an external structural frame is connected with a second rolling wheel through a screw bolt and a gasket, the outer side of a screw bolt positioned between the external structural frame and the second rolling wheel is provided with a spring, and the second rolling wheel is arranged at the side surface of the rail plate. The invention has a simple structure, and a guide bearing and a supporting bearing are not needed to be arranged on the supporting and center fixing structure.

Description

A kind of supporting of rotor of miniature rotary air preheater and the structure that centers

Technical field

The present invention relates to a kind of supporting of rotor of miniature rotary air preheater and the structure that centers, can be used for the small air preheater of root diameter below 6 meters, belong to the rotary type heat exchanger technical field.

Background technology

The energy-saving and emission-reduction of Industrial Stoves mainly rely on reclaims the heat energy that it discharges flue gas, as shown in Figure 1, be the miniature rotary air preheater structural representation, described miniature rotary air preheater is made up of loam cake 1, rotor 2, supporting cylinder 3, transmission device 4, outside framework 5 and expansion guide 6.Its operation principle is by continuing rotor rotated 2, with the heat absorption of high temperature side (being the waste gas that kiln is discharged), emit heat when turning to low temperature side (promptly sending into the air of kiln), realizing the recycling of heat energy in the waste gas.Consider heat exchange efficiency and arrangement convenience, generally the waste gas that temperature is reached about 1200 ℃ is introduced from the top, and cold air is introduced from the below, and rotor 2 axis normal are in the arrangement on ground.Waste gas can drop to below 200 ℃ in temperature after the heat release, discharges from the bottom.Thereby for rotor 2, upper temp will be more than the bottom height, and the upper expansion amount is also much bigger than the bottom.Common station boiler generally is lower than 450 ℃ with the inlet EGT of rotary regenerative air preheater, and the turnover position of waste gas and air and air preheater shown in Figure 1 are basic identical.

As shown in Figure 2, be the supporting of traditional rotor and the structural representation that centers, a guide end axle 12 that is connected with rotor center tube 11 is set above rotor 2, a guide bearing 13 is installed on the guide end axle 12, guide bearing is fixed on the top built-in beam 14; A supported end axle 15 is set below rotor to link to each other with central tube 11, rotor weight is delivered on the thrust bearing 16 that is arranged on supported end axle below, two bearings have been made the centre of gyration line 17 of rotor up and down, thrust bearing 16 is installed on the bottom built-in beam 18, built-in beam connects by the bearing 19 that is positioned at its two ends up and down, forms a framework support mechanism.

This design is to the huge revolving regenerative air heater, and is comparatively reasonable, but uses on miniature rotary air preheater, following point can occur:

1. structure is too complicated, and the loam cake of air preheater and bottom cylindrical shell need be provided with built-in beam, will arrange also that in rotor exterior built-in beam connects bearing up and down, and structure is numerous and diverse, the maintenance difficulty, and manufacturing cost is also very high.

Top since kiln come waste gas and the heating after air themperature all reach 1000 ℃, can cause nearly 1000 ℃ of guide end axle temperature degree, guide end axle selection difficulty not only, and be difficult to choose anti-1000 ℃ long-term work bearing, as adopt water-cooling system will cause system too complicated, consume many cooling waters; So working under the hot environment, also there is disaster hidden-trouble as adopting grease lubrication in bearing.

Summary of the invention

The purpose of this invention is to provide a kind of supporting and the structure that centers of rotor of miniature rotary air preheater simple in structure, it does not need to be provided with guide bearing and block bearing.

In order to achieve the above object, technical scheme of the present invention provides a kind of supporting of rotor of miniature rotary air preheater and the structure that centers, it is characterized in that, comprise track plate and the transmission shroud of being located at the rotor side surface lower end, the transmission shroud is located at track plate upside, the upper end, supporting cylinder side that is positioned at the rotor downside is provided with base plate, supporting cylinder inside is provided with pillar corresponding to the position of base plate, base plate and pillar are fixed together, base plate is provided with bearing pin, bearing pin connects first roller by rolling bearing, and first roller is located at track plate below; Outside framework connects second roller by bolt and pad, and the bolt outside between the outside framework and second roller is provided with spring, and second roller is located at track plate side.

Advantage of the present invention has:

(1) no longer needs to be provided with complex components such as guide end axle, supported end axle, guide bearing, block bearing, last built-in beam, following built-in beam, connection bearing.

(2) do not need to use cooling medium.Roller working position temperature is not high, only needs to use plain oil grease lubrication, does not have disaster hidden-trouble.

(3) roller is simple and reliable project organization, all is arranged in device external, does not need the access arrangement maintenance to change, and is easy to operate.

(4) adjustment work is installed conveniently, less demanding to installation personnel technical ability.

Description of drawings

Fig. 1 is the miniature rotary air preheater structural representation;

Fig. 2 is the supporting and the structural representation that centers of traditional rotor;

Fig. 3 is the supporting and the structural representation that centers of rotor of the present invention;

Fig. 4 is the supporting and the structure I place partial enlarged drawing that centers of rotor of the present invention;

Fig. 5 is the supporting and the structure A-A sectional view that centers of rotor of the present invention.

The specific embodiment

Specify the present invention below in conjunction with embodiment.

Embodiment

As shown in Figure 3, be the supporting of rotor of the present invention and the structural representation that centers, Fig. 4 is its A-A sectional view for its I place partial enlarged drawing, Fig. 5.The supporting of described rotor of miniature rotary air preheater and the structure that centers comprise track plate 26 and the transmission shroud 27 of being located at lower end, rotor 2 side, transmission shroud 27 is located at track plate 26 upsides, the upper end, supporting cylinder 3 sides that is positioned at rotor 2 downsides is provided with base plate 24, supporting cylinder 3 inside are provided with pillar 25 corresponding to the position of base plate 24, base plate 24 and pillar 25 are fixed together, base plate 24 is provided with bearing pin 23, bearing pin 23 connects first roller, 21, the first rollers 21 by rolling bearing 22 and is located at track plate 26 belows; Outside framework 5 connects second roller 28 by bolt 29 and pad 31, and bolt 29 outsides between the outside framework 5 and second roller 28 are provided with spring 30, the second rollers 28 and are located at track plate 26 sides.

Consider that small air preheater diameter is little, with the combustion gas of its underpart and the partial design of introducing cold air is supporting cylinder 3, arranges roller 21 in supporting cylinder 3 peripheries, shares the weight of rotor 2, by supporting cylinder 3, be delivered on the outside framework 5 in ground.Roller group structure is: first roller 21 is enclosed within on the horizontally disposed bearing pin 23 by two roller bearings 22, and bearing pin is welded on and is fixed on the outer base plate 24 of cylindrical shell.The inboard of base plate place cylindrical shell is provided with local reinforcement or pillar 25.The layout quantity of first roller 21 is according to rotor weight, pays the utmost attention to number and be four multiple.

Rotor 2 housings below, be the temperature of rotor lowest part herein, generally be no more than 200 ℃, arrange a circle track plate 26, the steel plate that promptly goes in ring, its excircle and rotor 2 turning together guarantee good circularity.Track plate 26 bottoms are placed on the supporting rollern 21, and when transmission shroud 27 was driven by transmission device 4, track plate 26 lower surfaces promptly became rotor 2 rotating orbital planes.

Second roller 28 is located on the newel of outside framework 5, is provided with four groups altogether, is connected on the outside framework with bolt 29 and spring 30.Second roller 28 contacts with rotor track plate 26 peripheries, and four group of second roller 28 determined the centre of gyration of rotor 2 jointly, bears rotor 2 thermal expansion counter-force transmission counteragents.The quantity of second roller 28 can change according to actual needs, arranges one or several roller.

With different by rotor 2 outer Monday of section rotational line speed, uneven for avoiding wearing and tearing, first roller 21 can consider to adopt ladder or inclined design to first roller 21 by rotor centerline one end, and the skidding the during transmission of assurance roller is partially or completely offset.When adopting inclined design, first roller, 21 boss ratios should equal the boss ratio of track plate 26 contact-making surface rings.

Track plate 26 cooperates first roller 21, the design of skidding of minimum needs, and the lower surface of track plate 26 can be designed to the inclined-plane that inner thick outer end approaches, or cascaded surface.The cooperation of the size basis and first roller 21 is decided.The thickness of track plate 26 needs to obtain after the integrated stress analysis.

In track plate operating position, temperature basically identical on the whole circumference, so four groups of second roller, 28 installation requirement unanimities that center, spring 30 decrements are the pairing swell increment of operating temperature of 2 coverboard lower ends from the room temperature to the rotor, the maximum compressibility of setting spring 30 in view of the above, and carry out spacingly, avoid causing rotor 2 secundlies because of spring 30 performance differences.

Because of rotor 2 thermal expansion forces are very big, so the spring 30 of centralizer can adopt the form of the big elastic force of little decrement, optionally form has spiral compression spring and butterfly spring.

The driving force size variation is little, and direction is constant, so when regulating rotor 2 centre of gyration lines, need to observe rotor 2 deflection situations in rotary rotor 2 backs, adjusts pad 31 thickness of centralizer in good time.

The present invention is by adopting the periphery supporting mode, effective simplification the overall structure of small air preheater, all rotatable parts are arranged in and are easy to approaching rotor periphery, and are easy to operate, needing at high temperature location arrangements bearing to have avoided the difficult problem of cooling and lubricating.

Claims

1. the supporting of a rotor of miniature rotary air preheater and the structure that centers, it is characterized in that, comprise track plate (26) and the transmission shroud (27) of being located at rotor (2) lower end, side, transmission shroud (27) is located at track plate (26) upside, the upper end, supporting cylinder (3) side that is positioned at rotor (2) downside is provided with base plate (24), the inner position corresponding to base plate (24) of supporting cylinder (3) is provided with pillar (25), base plate (24) and pillar (25) are fixed together, base plate (24) is provided with bearing pin (23), bearing pin (23) connects first roller (21) by rolling bearing (22), and first roller (21) is located at track plate (26) below; Outside framework (5) connects second roller (28) by bolt (29) and pad (31), and bolt (29) outside that is positioned between outside framework (5) and second roller (28) is provided with spring (30), and second roller (28) is located at track plate (26) side.