CN203023134U

CN203023134U - Multistage drainage pump

Info

Publication number: CN203023134U
Application number: CN 201320008640
Authority: CN
Inventors: 程爱华; 刘冬桂; 吴波
Original assignee: CHANGSHA SWAN INDUSTRIAL PUMP Co Ltd
Current assignee: Leo Group Hunan Pump Co Ltd
Priority date: 2013-01-08
Filing date: 2013-01-08
Publication date: 2013-06-26
Anticipated expiration: 2023-01-08

Abstract

The utility model discloses a multistage drainage pump which is characterized in that an inducer (8) is arranged in front of a first-stage impeller (10); a water inlet segment (7) and a water outlet segment (12) are fixed on a pump support through fasteners in a center supporting manner; a limiting block (18)is arranged at the lower end of the water inlet segment to limit circumferential movement; the lower end of the water outlet segment is in the form of a feather key (16) to be favorable for thermal expansion; shaft seals at both ends of the pump are mechanical seals (8), and mechanical seal rinsing water is self water flowing from a first stage of the pump and cooled by a cooler; the water inlet segment and the tail cap are provided with cooling cavity to receive and cool outer clean water; a drive end bearing assembly adopts cylindrical roller bearings to bear a radial load; and a non drive-end bearing assembly is a combination of cylindrical roller bearings and angular contact bearings. The drainage pump provided by the utility model is good in suction performance, high in efficiency, smooth in operation, convenient to maintain, safe and reliable, can be widely applied to delivering low pressure heater drainage water or like hot water in thermal power plants, and has very good economic benefit and social benefit.

Description

A kind of multistage drainage pump

Technical field

The utility model relates to a kind of drainage pump, particularly relates to a kind of multistage drainage pump that the hydrophobic or similar hot water of medium of low-pressure heater is carried in the thermal power plant that is widely used in.

Background technique

The needs that constantly enlarge for adapting to thermal power plant capacity and scale are as carrying the hydrophobic drainage pump of low-pressure heater also to large flow, high-lift, high-power future development.One step single sucking in the market or two-stage single suction drainage pump or flow is little or lift is low or cavitation performance is poor, maybe can not satisfy and carry the high temperature media requirement.This drainage pump adopts that the pump pin supports, the bearing suspension form, and substantial structure does not change, and when carrying high temperature media, axle is easily crooked, will cause the problems such as water pump vibration, mechanical seal damage, bearing life be short.

The model utility content

Technical problem to be solved in the utility model be to provide a kind of suction performance good, operate steadily, easy to maintenance, the safe and reliable hydrophobic multistage drainage pump of conveying high temperature.

In order to solve the problems of the technologies described above, the multistage drainage pump that the utility model provides, comprise inlet segment, water exit end, front pump support, rear pump support, first stage impeller, first section, stage casing, tail-hood, machine sealed cover, main shaft, clutch shaft bearing body, the second bearing support, clutch shaft bearing end cap, the second bearing (ball) cover, clutch shaft bearing gland, the second bearing gland, drive end axle bearing assembly and non-driven end bearing component, be furnished with the inducer of the front end that is in described first stage impeller on described main shaft; Described inlet segment adopts the intermediate support mode to be fixed on described front pump support by fastening piece, and the mode that the lower end employing of described inlet segment contacts with the limiting stopper circumference limits it and circumferentially moves; Described water exit end adopts the intermediate support mode to be fixed on described rear pump support by fastening piece, and the lower end employing of described water exit end guides with the mode of the axial contact both sides of feather key, is conducive to thermal expansion.

The two ends shaft seal of described main shaft adopts respectively the first mechanical seal and the second mechanical seal, and described stage casing is provided with flush head, and machine envelope sparge water is for picking out from described flush head through cooled self water of cooler; Being provided with the external cooling water of cooling chamber on described inlet segment, tail-hood carries out cooling; Described drive end axle bearing assembly and described non-driven end bearing component are contained in respectively the two ends of described inlet segment, water exit end, and described drive end axle bearing assembly adopts the first roller bearing to bear radial load; Described non-driven end bearing component adopts the second roller bearing and angular contact ball bearing combination.

Clutch shaft bearing body top is cast with the first radiating fin, and the second bearing support top is cast with the second radiating fin.

Oil-return groove is offered in described clutch shaft bearing gland, the second bearing gland, clutch shaft bearing end cap, the second bearing (ball) cover bottom.

Adopt the multistage drainage pump of technique scheme compared with prior art, have following advantage:

1), arrange inducer and first section before first stage impeller, can effectively improve the suction performance of pump, satisfy power plant to the requirement of the high cavitation performance of drainage pump, can make pump operation more steady, longer service life;

2), adopt multilevel hierarchy, can increase impeller progression as required, adapt to high-lift demand.

3), inlet segment, water exit end adopt the intermediate support mode, when carrying high temperature media, but the pump rotor easy on and off expand, will can not cause that water pump and motor coupler centering change, safety in operation improves greatly;

4), inlet segment is circumferentially fixed, and water exit end adopts guidance mode guiding thermal expansion, is conducive to axially moving freely of housing thermal expansion, and the housing seal performance is better, and Security is higher;

5), Pump Shaft Seal is mechanical seal, and the structure assurance machine envelope reliability of operation of the external water quench of cooling chamber is set by housing, is set to through cooling self water the problem of pump inlet pressure in the time of need consideration machine envelope sparge water with sealing sparge water opportunity;

6), the pump drive end arranges roller bearing, anti-drive end is arranged roller bearing and angular contact ball bearing combination, roller bearing bears radial load, the axial float of angular contact ball bearing restrictive axes has improved mechanical seal working life; Bearing adopt thin oil lubricant, bearing support establish the water cooling chamber carry out cooling, the annular fin of bearing support top casting simultaneously, casting is convenient, good heat dissipation effect, the bearing longer service life, bearing is safe and reliable to operation; Offer oil-return groove in bearing gland, bearing (ball) cover bottom, can effectively control the leakage of lubricant oil, safeguard still less;

In sum, the utility model be a kind of for the thermal power plant carry the hydrophobic or medium of low-pressure heater be similar to the suction performance of hot water good, operate steadily, easy to maintenance, safe and reliable multistage drainage pump.

Description of drawings

Fig. 1 is the utility model structural representation.

Embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Referring to Fig. 1, by rod, inlet segment 7, first section 9, stage casing 11, water exit end 12 are linked together, be furnished with the inducer 8 of the front end that is in first stage impeller 10 on main shaft 36; Inlet segment 7 adopts the intermediate support mode to be fixed on front pump support 34 by fastening piece, and the mode that inlet segment 7 lower ends employings contact with limiting stopper 18 circumference limits it and circumferentially moves; Water exit end 12 adopts the intermediate support mode to be fixed on rear pump support 17 by fastening piece, and water exit end 12 lower ends employings guide with the mode of feather key 16 axial contact both sides, are conducive to thermal expansion; The two ends shaft seal of main shaft 36 adopts respectively the first mechanical seal 6, the first machine sealed cover 5 and the second mechanical seal 61, the second machine sealed cover 20, stage casing 11 is provided with flush head 35, and machine envelope sparge water is for picking out from flush head 35 through cooled self water of cooler; Being provided with the external cooling water of cooling chamber on inlet segment 7, tail-hood 13 carries out cooling; Drive end axle bearing assembly and non-driven end bearing component are contained in respectively the two ends of inlet segment 7, water exit end 12, and the drive end axle bearing assembly adopts the first roller bearing 3 to bear radial load; Non-driven end bearing component adopts the second roller bearing 31 and angular contact ball bearing 14 combinations, the second roller bearing 31 bears radial load, angular contact ball bearing 14 bears instantaneous axial load, simultaneously control the rotor axial amount of altering together with the second bearing (ball) cover 15, be conducive to protect mechanical seal; Bearing adopts thin oil lubricant, bearing support to establish the water cooling chamber to carry out coolingly, and clutch shaft bearing body 2 tops are cast with the first radiating fin 32, the second bearing support 21 tops and are cast with the second radiating fin 33 simultaneously; Oil-return groove is offered in clutch shaft bearing gland 4, the second bearing gland 41, clutch shaft bearing end cap 1, the second bearing (ball) cover 15 bottoms.

The drainage pump suction performance that the utility model provides is good, efficient is high, operate steadily, easy to maintenance, safe and reliable, can be widely used in the thermal power plant and carry the hydrophobic or similar hot water of low-pressure heater, have good economic benefit and social benefit.

Personnel in the art should be realized that, above-described embodiment is not with this novel restriction of opposing, as long as in this novel connotation scope, any above-described embodiment technique variation, flexible program are not all exceeded protection domain of the present utility model.

Claims

1. multistage drainage pump, comprise inlet segment (7), water exit end (12), front pump support (34), rear pump support (17), first stage impeller (10), first section (9), stage casing (11), tail-hood (13), the first machine sealed cover (5), the second machine sealed cover (20), main shaft (36), clutch shaft bearing body (2), the second bearing support (21), clutch shaft bearing end cap (1), the second bearing (ball) cover (15), clutch shaft bearing gland (4), the second bearing gland (41), drive end axle bearing assembly and non-driven end bearing component, it is characterized in that: the inducer (8) that is furnished with the front end that is in described first stage impeller (10) on described main shaft (36), described inlet segment (7) adopts the intermediate support mode to be fixed on described front pump support (34) by fastening piece, and the mode that described inlet segment (7) lower end employing contacts with limiting stopper (18) circumference limits it and circumferentially moves, described water exit end (12) adopts the intermediate support mode to be fixed on described rear pump support (17) by fastening piece, and described water exit end (12) lower end employing guides with the mode of the axial contact both sides of feather key (16), is conducive to thermal expansion.

2. multistage drainage pump according to claim 1, it is characterized in that: the two ends shaft seal of described main shaft (36) adopts respectively the first mechanical seal (6) and the second mechanical seal (61), described stage casing (11) is provided with flush head (35), and machine envelope sparge water is for picking out from described flush head (35) through cooled self water of cooler; Being provided with the external cooling water of cooling chamber on described inlet segment (7), tail-hood (13) carries out cooling; Described drive end axle bearing assembly and described non-driven end bearing component are contained in respectively the two ends of described inlet segment (7), water exit end (12), and described drive end axle bearing assembly adopts the first roller bearing (3) to bear radial load; Described non-driven end bearing component adopts the second roller bearing (31) and angular contact ball bearing (14) combination.

3. multistage drainage pump according to claim 1 and 2 is characterized in that: clutch shaft bearing body (2) top is cast with the first radiating fin (32), and the second bearing support (21) top is cast with the second radiating fin (33).

4. multistage drainage pump according to claim 1 and 2 is characterized in that: oil-return groove is offered in described clutch shaft bearing gland (4), the second bearing gland (41), clutch shaft bearing end cap (1), the second bearing (ball) cover (15) bottom.