CN206320075U

CN206320075U - A kind of thermal power plant mill exhauster leak-proof device

Info

Publication number: CN206320075U
Application number: CN201621437783.0U
Authority: CN
Inventors: 王克书; 胡玉方
Original assignee: Electricity Generating Corp Ltd Of Wild Horse Stockaded Village Datang Guizhou
Current assignee: Electricity Generating Corp Ltd Of Wild Horse Stockaded Village Datang Guizhou
Priority date: 2016-12-26
Filing date: 2016-12-26
Publication date: 2017-07-11
Anticipated expiration: 2026-12-26

Abstract

The utility model discloses a kind of thermal power plant mill exhauster leak-proof device, including impeller axle, spiral case, impeller and accessory impeller, the impeller axle is installed on impeller central hole, its one end stretches out spiral case end face, the accessory impeller is installed on the rear trochal disc of impeller, and impeller is installed on the inside of spiral case with accessory impeller.The utility model can make the reliability of mill exhauster be largely increased, because the leakage powder between impeller axle and nest shell is solved, be prevented effectively from coal dust causes impeller bearing to damage into mill exhauster impeller bearing, reduces the generation of impeller bearing burning damage accident, significantly reduces the workload of maintainer.Pollution of the coal dust to lubricating oil station lubricating oil is avoided simultaneously, the abrasion of equipment operation is reduced, and environmental pollution is controlled, and scene, which is carried out production strictly in line with rules and regulations, is protected, and achieves obvious Social benefit and economic benefit.

Description

A kind of thermal power plant mill exhauster leak-proof device

Technical field

The utility model is related to a kind of thermal power plant mill exhauster leak-proof device.

Background technology

Felt seal is used between impeller axle and nest shell in the mill exhauster of thermal power plant, because mill exhauster impeller axle is revolved at a high speed Turn the felt between impeller axle and nest shell wear and tear, the malleation breeze airflow between last mill exhauster impeller and nest shell will from felt with Blown out in impeller shaft clearance, the breeze airflow blown out from felt and impeller shaft clearance can cause impeller into mill exhauster impeller bearing Bearing damage, while a large amount of breeze airflows enter Air seriously polluted environment, making the environment of carrying out production strictly in line with rules and regulations at scene can not ensure.Fire No. 4~5 mill exhauster impeller bearing burning damage accidents occur every year on average for power power plant, and mill exhauster occurs after impeller bearing accident, more Change impeller bearing and at least want 24 hours, the necessary load down operation of unit, sends out 100,000 less on an hourly basis during impeller bearing is changed Calculate, when an accident is by 2,400,000 ten million ﹒ of electricity is lost, calculated by 0.35 yuan of electricity is often spent, direct economic loss is during thousand watts of ﹒ 840000/time, five 4,200,000 yuan of minor losses.

Utility model content

In order to solve the above technical problems, the utility model provides a kind of thermal power plant mill exhauster leak-proof device.

The utility model is achieved by the following technical programs.

A kind of thermal power plant mill exhauster leak-proof device that the utility model is provided, including impeller axle, spiral case, impeller and pair Impeller, the impeller axle is installed on impeller central hole, and its one end stretches out spiral case end face, and the accessory impeller is installed on after impeller On wheel disc, impeller is installed on the inside of spiral case with accessory impeller.

Impeller is overlapped with the center line of accessory impeller with spiral case center line.

The accessory impeller is combined by some blades.

The number of sheets of the accessory impeller is 5~7.

The accessory impeller is to be fixed in a welding manner on the rear trochal disc of impeller.

The vanelets setting angle of the accessory impeller is consistent with impeller.

The vanelets thickness of the accessory impeller is 3~4mm, a width of 20~25mm, the equal length or difference of length and impeller 5mm。

The vanelets material of the accessory impeller is abrasion-proof manganese steel or steel alloy.

The beneficial effects of the utility model are：

Compared with prior art, after using the utility model, the reliability of mill exhauster is largely increased, due to impeller Leakage powder between axle and nest shell is solved, and is prevented effectively from coal dust and causes impeller bearing to damage into mill exhauster impeller bearing, The generation of impeller bearing burning damage accident is reduced, the workload of maintainer is significantly reduced.Coal dust is avoided to lubricating oil simultaneously Stand the pollution of lubricating oil, reduce the abrasion of equipment operation, environmental pollution is controlled, and scene, which is carried out production strictly in line with rules and regulations, is protected, obtain Obvious Social benefit and economic benefit.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model；

In figure：1- impeller axles, 2- spiral cases, 3- impellers, 4- accessory impellers, 41- rear trochal discs

Embodiment

Be described further below the technical solution of the utility model, but claimed scope be not limited to it is described.

It is described further with reference to accompanying drawing, a kind of described thermal power plant mill exhauster leak-proof device includes impeller axle 1, snail Shell 2, impeller 3 and accessory impeller 4, the impeller axle 1 are installed on the centre bore of impeller 3, and its one end stretches out the end face of spiral case 2, the pair Impeller 4 is installed on the rear trochal disc 41 of impeller 3, and impeller 3 is installed on the inside of spiral case 2 with accessory impeller 4.

Thermal power plant 200MW unit boilers bin storage type pulverizing system uses centrifugal Powder discharging fan, is arranged in operation Powder machine impeller 3, which rotates at a high speed, sends into milling waste steam processed in burner hearth.Gap original between impeller axle 1 and nest shell 2 uses felt seal, by In mill exhauster impeller axle 1 and felt contacts, felt is easily worn in operation, is just ground between mill exhauster impeller axle 1 and nest shell 2 Coal dust is blown out at the felt of damage.

This be due to impeller 3 in the running, zone of positive pressure, i.e. impeller 3 and the trailing wheel of nest shell 2 are formed between impeller axle 1 and nest shell 2 41 pressure superatmospherics of disk, force coal dust outwards to fly out.Pressure is less than big between rear trochal disc 41 to make nest shell 2 and impeller 3 Air pressure, that is, form negative pressuren zone, therefore, and accessory impeller 4 is installed additional in the rear trochal disc 41 of nest shell 2 and impeller 3.Stop when installing additional in mill exhauster In the state of operation, impeller 3 is hung out or when changing impeller 3, using 5~7 thickness 3~4mm, wide 20~25mm, length and leaf Take turns the roughly equal abrasion-proof manganese steel of 3 length or other steel alloys are fabricated to vanelets.Vanelets made after along the blade of prophyll wheel 3 Direction and angle welded, when being welded on the rear trochal disc 41 of impeller 3, because the thickness of rear trochal disc 41 is thicker, therefore Easily produced during welding on rear trochal disc 41 needs to carry out hot place to the welding position of impeller 3 after additional stress, therefore increase accessory impeller 4 Reason.

When the impeller 3 of mill exhauster is in the case where motor is rotated, because accessory impeller 4 is welded on the rear trochal disc 41 of mill exhauster impeller 3 On, accessory impeller 4 is with the high-speed rotation of impeller 3, and the high-speed rotation band of accessory impeller 4 breeze airflow of starting moving between shell 2 and impeller 3 revolves at a high speed Turn, then breeze airflow acquisition centrifugal force is got rid of to the top of nest shell 2 at this.Make to form negative pressure between mill exhauster impeller axle 1 and nest shell 2, Then just it is avoided that the breeze airflow leakage in nest shell 2.Because increase accessory impeller 4 is in coal dust Relatively centralized region, therefore accessory lobes 4 vanelets serious wears are taken turns, it is necessary to periodically carry out soldering or replacing.

Breeze airflow is avoided into mill exhauster bearing and entrance atmosphere pollution ring using accessory impeller 4 is installed additional in mill exhauster Border, so as to avoid mill exhauster impeller bearing damage accident, pulverized coal preparation system lubricant pollution accident and ensure the text at scene Open-birth is produced.

Impeller 3 is overlapped with the center line of accessory impeller 4 with the center line of spiral case 2.

The accessory impeller 4 is combined by some blades.

The number of sheets of the accessory impeller 4 is 5~7.

The accessory impeller 4 is fixed in a welding manner on the rear trochal disc 41 of impeller 3.

The vanelets setting angle of the accessory impeller 4 is consistent with impeller 3, so that the centrifugal force that impeller 4 is produced when rotating is big.

The vanelets thickness of the accessory impeller 4 is 3~4mm, a width of 20~25mm, the equal length or phase of length and impeller 3 Poor 5mm.

The vanelets material of the accessory impeller 4 is abrasion-proof manganese steel or steel alloy, so that vanelets service life is more longlasting.

Claims

1. a kind of thermal power plant mill exhauster leak-proof device, it is characterised in that：Including impeller axle (1), spiral case (2), impeller (3) and Accessory impeller (4), the impeller axle (1) is installed on impeller (3) centre bore, and its one end stretches out spiral case (2) end face, the accessory impeller (4) it is installed on the rear trochal disc of impeller (3) (41), impeller (3) is installed on the inside of spiral case (2) with accessory impeller (4).

2. a kind of thermal power plant mill exhauster leak-proof device as claimed in claim 1, it is characterised in that：Impeller (3) and accessory lobes The center line of wheel (4) is overlapped with spiral case (2) center line.

3. a kind of thermal power plant mill exhauster leak-proof device as claimed in claim 1, it is characterised in that：The accessory impeller (4) Combined by some blades.

4. a kind of thermal power plant mill exhauster leak-proof device as claimed in claim 1, it is characterised in that：The accessory impeller (4) The number of sheets be 5~7.

5. a kind of thermal power plant mill exhauster leak-proof device as claimed in claim 1, it is characterised in that：The accessory impeller (4) It is to be fixed in a welding manner on the rear trochal disc of impeller (3) (41).

6. a kind of thermal power plant mill exhauster leak-proof device as claimed in claim 1, it is characterised in that：The accessory impeller (4) Vanelets setting angle and impeller (3) it is consistent.

7. a kind of thermal power plant mill exhauster leak-proof device as claimed in claim 1, it is characterised in that：The accessory impeller (4) Vanelets thickness be 3~4mm, a width of 20~25mm, the equal length or difference 5mm of length and impeller (3).

8. a kind of thermal power plant mill exhauster leak-proof device as claimed in claim 1, it is characterised in that：The accessory impeller (4) Vanelets material be abrasion-proof manganese steel or steel alloy.