CN2789464Y - Water inlet up moving counter-flow liquid bottom pump - Google Patents

Abstract

The utility model discloses a water inlet up moving counter-flow liquid bottom pump, which is mainly composed of a pump cover, an impeller, a pump body and upper moving static water bearings. The utility model is characterized in that a water inlet of the impeller is upward and is arranged on the pump cover. The utility model has reasonable structure, overflow water is changed into supplementing water under the condition that water films exist between the moving static water bearings, thus eliminating the internal leakage of 5 percents of flow rate of a liquid bottom pump. Under the condition of fretting the moving static water bearings, the output flow rate of the pump can be ensured, thus improving the efficiency of the liquid bottom pump and extending the service life of the pump. The water inlet moves upward to cause the vortex effect generated by the rotation of the impeller to be away from the sedimentation zone of a liquid pool, thus up to the hilt avoiding the self loss of the pump because of industrial garbages at the sedimentation zone.

Description

The adverse current Under Water Pumps that moves on the water intake

Technical field:

The utility model belongs to the technical field of industrial pump, particularly relates to a kind of adverse current Under Water Pumps.

Background technique:

Under Water Pumps has formed product line as the modification structures of single stage single suction volute pump, at chemical-process, and environmental protection treatment, paint industry, printed circuit board (PCB)s etc. all are widely used.This depends primarily on it has start and need not the diversion advantage; The essential diversion of lay special stress on start in vertical centrifugal pump operation instruction for sleeping in commonly used, this is by on the dress liquid level because of centrifugal pump, start is with the beginning, water shortage in the pump so that impeller the pump inlet district draw into enough degree of vacuum with liquid pool in liquid draw up, take off liquid running thereby draw into pump, consequently the contact friction in the machine envelope explosion pump in addition part kill so that burn out motor at last revolving swollen the rising of heating at a high speed.And the impeller of Under Water Pumps places the following start of liquid level to need not the diversion advantage on the product structure just.And because whole pump places within the liquid pool, and pump does not have external leakage extremely, even partly part damage in addition in the pump is that the internal leakage of pump increases suddenly at most, but can not causes environmental pollution.

Yet the Under Water Pumps of weighing existing type from efficient required standard also exists some disadvantages, and its basic reason is product structure.Figure 1 shows that the General Construction of the Under Water Pumps of existing type, now come dissection and analysis by figure.

6 is impellers among the figure, and import is downward, because impeller rotates the centrifugal force that produces, liquid flows to into the pump housing and by the effect of pump housing inner spiral casing runner, and speed can be converted into the pressure energy, finishes the whole operations of pump from the low pressure area to the zone of high pressure by outlet pipe when pump turns round.Meanwhile at the impeller back side and pump cover 3, gap (2 ∽ 3mm) between impeller 6 fronts and the pump housing 5 is full of pressure liquid, the back side and pump cover 3, the gap (0.2 ∽ 0.5mm) that pressure liquid between the impeller 6 infiltrates between the sound submerged bearing 4 forms the friction moisture film, enters liquid pool by the overflow hole on the support column 2 at last.Pressure liquid between impeller 6 fronts and the pump housing 5 is then by the same friction moisture film that forms in the gap (0.2 ∽ 0.5mm) of impeller port ring and casing ring.Leak into water intake.Draw into following drawback thus;

1, pump efficiency descends too fast, owing to must form moisture film between the sound submerged bearing 4 of Under Water Pumps, prevent frictional heating, the gap of (0.2 ∽ 0.5mm) therefore is set between moving submerged bearing 4 and hydrostatic bearing 3, use the slit damping principle, the flow loss of pump is controlled in the minimum (≤5%) to guarantee the efficient of pump.Yet along with putting off of time, particle in the liquid, pump head goes out radial force reaction that hydraulic coupling causes on axle and produce amount of deflection, part is processed reasons such as the accuracy of form and position in addition, moving, hydrostatic wearing and tearing aggravation, the gap increases day by day, damping effect is also ineffective, and increasing liquid is discharged to overflow area from pump housing internal pressure district.Same reason, liquid is also along with the pressure liquid between impeller 6 fronts and the pump housing 5 then leaks into the imbibition low pressure area by the gap increase of impeller port ring and casing ring, the liquid outlet quantity of its consequence pump descends day by day, and a large amount of working solutions spillway hole from the support column flows back to liquid pool.

2, the import eddy flow is from decreasing, from figure (one) as seen, the water inlet guard of pump is positioned at the foot of pump, and the precipitation zone of liquid pool just, a large amount of industrial refuses, the chemical industry crystal all is deposited in the bottom of liquid pool, behind pump startup, pond liquid pours in the pump by guard under the effect of pump inlet low pressure, meanwhile because the rotation of impeller, and near the eddy flow that pump inlet, forms, be enough to sludge in the nearest pond of pump is stirred, again sneak in the liquid, though there is guard to stop the oarse-grained industrial rubbish utmost point, tiny chemical industry crystallization enters in the pump with liquid, infiltrate the sound submerged bearing, aggravated the abrasion of this other part that partly rubs in the gap of impeller port ring, quickened the damage of pump, this is very fatal.

Summary of the invention:

It is a kind of that the purpose of this utility model is to provide, and can effectively overcome above-mentioned defective, improved emptying effectiveness and prolonged the adverse current Under Water Pumps that moves on the water intake that moves on the water intake in working life.To achieve these goals, the technological scheme that the utility model adopted is, the adverse current Under Water Pumps that moves on a kind of water intake, and mainly by pump cover, impeller, the pump housing with go up dynamic and static submerged bearing and forms, its characteristics are: impeller intake makes progress, and is arranged on the pump cover.Owing to adopt such scheme, be not difficult to draw as drawing a conclusion, the utility model is rational in infrastructure, be skillfully constructed, after low pressure area goes to top, transfers low pressure area to by overflow area in the whole support column, spillway hole changes suction (gas) hole into, and the interstitial fluid stream that is arranged between the quiet moving submerged bearing in impeller inlet upper end transfers low pressure area suction zone of high pressure variation by the zone of high pressure to the original state of overflow area.The direct effect that this variation brings is to keep the gap between the quiet moving submerged bearing to exist under the moisture film prerequisite, the change spilling water is moisturizing, eliminated the internal leakage of Under Water Pumps flow 5%, both made under the situation of sound submerged bearing wearing and tearing, also can guarantee the output flow of pump, both improve Under Water Pumps efficient, prolonged the working life of pump.Move on the water intake in addition and make cyclonic effect that the impeller rotation produces precipitation zone, the damage certainly of having avoided the industrial refuse of precipitation to bring to greatest extent, tool promotional value to pump away from liquid pool.

Description of drawings:

Fig. 1 is the structural representation of conventional Under Water Pumps;

Fig. 2 is a structural representation of the present utility model.

Embodiment:

Below in conjunction with drawings and Examples the utility model is described in further detail.

Among Fig. 2, pump impeller 50 water intakes upwards, pond liquid enters impeller from the water intake that is arranged on the pump cover 40, in the water intake outer ring guard is set, to stop the industrial refuse in the liquid of pond to enter, the import upper end disposes quiet moving submerged bearing 20,30, and impeller 50 front and back all dispose sealing opening ring, and back impeller is set, add a pair of sound submerged bearing 60,80 of configuration in addition in the lower end of the pump housing 70.Thus and thus, the liquid of pump stream is inverted, and low pressure area forwards top to by the end opening of pump, and it is the change of adverse current that the operation conditions of pump takes place from following current, and the variation of matter also takes place pump performance thereupon.

Claims (1)

1, the adverse current Under Water Pumps that moves on a kind of water intake mainly is made up of pump cover, impeller, the pump housing and last dynamic and static submerged bearing, and it is characterized in that: impeller intake upwards is arranged on the pump cover.

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