CN203257719U - Anti-explosion double-screw-rod self-pumping pump - Google Patents

Abstract

The utility model provides an anti-explosion double-screw-rod self-pumping pump which comprises a pump body, a flow inlet and a flow outlet. A cover plate, locating sleeves, bushings, a mechanical seal, a locating ring, a connecting plate, a mechanical seal gland, a driven shaft, a bearing gland, a roller bearing, a drive shaft, a driven gear, a driven gear, a gear nut, a bracket, a double-row angle contact ball bearing, a blank cap, a bearing nut and a transparent cover are arranged on the pump body. The drive shaft and the driven shaft are in linkage motion through the drive gear and the driven gear. One end of the drive shaft and one end of the driven shaft are respectively sleeved with a screw sleeve. The other end of the drive shaft and the other end of the driven shaft are fixedly connected to the pump body through the locating sleeves, the bushings and locking nuts. The screw sleeves on the drive shaft and the driven shaft are made of poly ether ether ketone (PEEK) materials. The anti-explosion double-screw-rod self-pumping pump has the anti-explosion function, and can ensure that equipment in petrochemical enterprises operates safely, stably and efficiently.

Description

Explosion-proof twin-screw Strong self priming pump

Technical field

The utility model relates to a kind of pump, and particularly a kind of explosion-proof twin-screw Strong self priming pump is applied to petroleum chemical industry.

Background technique

As everyone knows, put under petroleum chemical enterprise's refinery device liquid under the liquid such as main use long shaft submerged pump, submerged pump, strong self-priming pump, non-sealing self-sucking pump, interior backflow self-priming pump, turbine-type self-priming pump in the past and put on pump, even use putting on pump under the liquid of common two screw pump as petroleum chemical enterprise's refinery device, it is existent defect and deficiency, the serious potential safety hazard that namely exists medium to fire easily also.

Put on the pump structure principle under above-mentioned each liquid and pluses and minuses as follows:

(1) long shaft submerged pump

1, main structure principle and characteristics

(1) impeller immerses under the liquid, and available NPSH NPSHA＞necessary net positive suction head NPSHR is difficult for finding time;

(2) upper end rolling bearing and bottom Tuo Wa combination realizes rotor axial location and radial support;

(3) outside one liquid stream of introducing of self-pumping watt is lubricated holder.

2, the problem that exists in the operation process

(1) pump shaft is longer, and lifting and maintenance are very inconvenient;

(2) pump shaft is longer, vibrate larger, the holder watt rapid wear, rate of fault is relatively high;

(3) pump has unusually, be difficult for to find, can not on-call maintenance, to such an extent as to cause equipment badly damaged, and easily cause security incident;

(4) have gas-phase space in the oil sump, the mechanical friction spark that produces in the pump operation process easily causes the combustible gas blast, has larger potential safety hazard.

(2) submerged pump

1, main structure principle and characteristics

(1) motor and the pump housing immerse under the liquid, and available NPSH NPSHA＞necessary net positive suction head NPSHR is difficult for finding time;

(2) pump housing and motor are coaxial, three mouthfuls of bearing combinations of motor side, rotor axial location and radial support;

(3) adopt two pass mechanical seal, sealing is immersed in the oil sealing.

2, the problem that exists in the operation process

(1) motor and the pump housing immerse under the liquid, inconvenient maintenance;

(2) after electrical apparatus element wore out, easily electric leakage was not explosion-proof;

(3) component are perishable, and the life-span is short;

(4) the machine envelope also lost efficacy than being easier to.

(3) strong self-priming pump

1, main structure principle and characteristics

(1) centrifugal pump shaft is lengthened, drives the suction-exhaust mechanism that is configured in the bearing housing place by self pump shaft, with plastic flexible pipe with suction-exhaust mechanism and pump suction pipe UNICOM;

(2) plugged, suction-exhaust mechanism is discharged gas in suction pipe and the pump case, and medium sucks pump chamber, and the pump shaft with suction-exhaust mechanism and High Rotation Speed breaks away from again, makes it stop suction and discharge, regulates outlet valve, makes pump operation.

2, the problem that exists in the operation process

(1) the suction and discharge system failure rate is high, because bearing housing has added the suction-exhaust mechanism load, bearing housing bearing and suction and discharge driving gear be rapid wear very, often repair and replacement;

(2) inhale vacuum and begin in the pump housing without medium, machine end-blocking face is done rotation and is often caused dry friction to damage, and as with after the packing seal dry grinding, it is large that the gap becomes, and gas leakage vacuumizes frequent inefficacy;

(3) the suction-exhaust mechanism gear needs the manual gear clutch, and the tooth phenomenon is beaten in operation inconvenience when often gears to engage and disengage occuring, easily produce spark, has potential safety hazard;

(4) medium often is inhaled into suction-exhaust mechanism, causes the water spray phenomenon;

(5) complex structure, the dismounting inconvenient maintenance, nonstandard pump safeguards that interchangeability is poor.

(4) non-sealing self-sucking pump

1, main structure principle and characteristics

(1) in pump case, is provided with gas-liquid separation chamber, starts in the front liquid storage room with the pump housing and below thereof and fill medium, separate and backflow by the continuous gas-liquid delivery of impeller after starting, the suction pipe air is taken away, reach the purpose that medium is sucted introducing.

2, the topic that exists in the operation process

(1) the self-priming performance reliability is low, and frequent self-priming lost efficacy when especially medium had impurity, and pump startup is not shown liquid;

(2) pump efficiency is low, itself has hydraulic loss and return loss, and hydraulic performance falls behind, and power consumption is large;

(3) suction capacity is poor, and maximum sucts 4.5m;

(4) the intake air control valve often lost efficacy, and caused after the termination of pumping medium siphon to flow backwards, and self-priming lost efficacy when again starting, frequent maintenance;

When (5) stopping transport, liquid overflows from accessory vane shaft seal easily in the pump.

(5) interior backflow self-priming pump (being also referred to as vapor and liquid mixed self-priming pump)

1, main structure principle

(1) in the pump housing, is designed with gas-liquid separation chamber, before starting pump filled medium, by the continuous gas-liquid delivery of impeller, separation and backflow, the pump suction pipe space is vacuumized after starting, reach the purpose that medium sucts.

2, the problem that exists in the operation process

(1) liquid backflow hole, separation chamber is subject to the impurity obstruction in the pump housing, often causes self-priming to lose efficacy;

(2) pump efficiency is low, has hydraulic loss and return loss;

(3) self-priming time is longer;

(4) the self-priming performance reliable rows is not high, and suction capacity is poor.

(6) turbine-type self-priming pump

1, main structure principle

(1) rotate the turbine engine that reaches 10000 rev/mins at the suction side of centrifugal pump configuration high-speed and vacuumize, medium is drawn in the pump case, with the pump startup operation, turbine engine quits work again.

2, the problem that exists in the operation process

When (1) vacuumizing, the inflammable gas of liquid pool gas-phase space is discharged by the impeller of turbine blower fan High Rotation Speed, because turbine draught fan impeller and housing clearance between guide vanes are very little, are easy to produce frictional heating or produce spark, the serious potential safety hazard that therefore exists dielectric gas to fire;

(2) easy to wear between turbine multistage wind wheel and the housing stator, suction capacity degradation after the wearing and tearing;

(3) turbine engine tank level control system defectiveness easily stops up malfunctioning;

(4) body that turbine engine is bled can't be collected, and can only be discharged in the atmosphere, and toxic gas pollutes and endangers;

(5) turbine engine complex structure, the maintenance cost expense is high, safeguards inconvenience.

The model utility content

The purpose of this utility model provides a kind of explosion-proof twin-screw Strong self priming pump, has explosion prevention function, can guarantee that the equipment in the petrochemical enterprise can be safely, steadily, efficiently operation.

The technical solution of the utility model: explosion-proof twin-screw Strong self priming pump, comprise the pump housing, inflow entrance and outflow opening, the pump housing is provided with cover plate, setting sleeve, lining, mechanical seal, positioning ring, connecting plate, the machine sealed cover, driven shaft, bearing gland, roller bearing, driving shaft, driving gear, driven gear, gear nut, carriage, double-row angular contact bal bearing, stifle, bearing nut and transparent cover, wherein driving shaft and driven shaft are realized linkage action by driving gear and driven gear, one end of driving shaft and driven shaft overlaps respectively screw-casing is arranged, setting sleeve is passed through in the other end of driving shaft and driven shaft, lining and locking nut are fixedly connected on the pump housing, and the screw-casing that on driving shaft and the driven shaft there is cover adopts the peek material.

Between driven shaft and the screw-casing adjusting nut is installed.

The beneficial effects of the utility model: the peek material has radioresistance, stable, the hydrolysis resistance of insulating properties, resistance to compression, the advantage such as corrosion-resistant, has self-lubricating effect with its mechanical parts that are made into, also have simultaneously the advantages such as heatproof, thermostability is good, superelevation is heat-resisting, screw-casing therefore of the present utility model adopts the peek material can make the twin-screw Strong self priming pump also have in use the advantages such as heatproof, thermostability is good, superelevation is heat-resisting, be applied in and have explosion prevention function in the petrochemical enterprise, and can make device security, steadily, efficiently operation; The utility model is by being equipped with adjusting nut between driven shaft and screw-casing, can adjust according to the situation of concrete use the rate of tension of screw-casing, so that the screw-casing on the screw-casing on the driven shaft and the driving shaft closely, cooperate efficiently, production can be carried out smoothly.

The same long shaft submerged pump of the utility model, submerged pump, non-sealing self-sucking pump, turbine sucking pump and strong self-priming pump, turbine-type self-priming pump etc. are compared in addition, and following advantages is arranged:

1: pump does not insert medium, and is not fragile;

2: the complete machine pump is convenient to maintenance more than ground;

3: it is time saving and energy saving that a pump priming is only permitted in start;

4: the self-priming machine suction head reaches seven meters, and suction capacity is strong;

5: rotatable parts are away from medium pool, and are safe and reliable;

6: self-priming speed is fast, requires low to field working conditions;

7: simple in structure, can need not special self-priming apparatus by self-priming;

8: feed flow that can the pulsating movement free continuous and stable;

9: without agitated medium emulsification situation;

10: can gas-liquid delivery, the NPSHr value is little;

11: but the transfer of highly viscous medium;

12: can carry the very low medium of flash-point;

13: the phenomenon that does not have inner convolution or reflux, more energy-conservation.

Description of drawings

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

Embodiment

As shown in Figure 1, explosion-proof twin-screw Strong self priming pump, comprise the pump housing 7, inflow entrance and outflow opening, the pump housing 7 is provided with cover plate 1, setting sleeve 2, lining 3, mechanical seal 9, positioning ring 10, connecting plate 11, machine sealed cover 12, driven shaft 13, bearing gland 14, roller bearing 15, driving shaft 16, driving gear 17, driven gear 18, gear nut 19, carriage 20, double-row angular contact bal bearing 21, stifle 22, bearing nut 23 and transparent cover 24, wherein driving shaft 16 and driven shaft 13 are realized linkage action by driving gear 17 and driven gear 18, one end of driving shaft 16 and driven shaft 13 overlaps respectively screw- casing 5,6, the other end of driving shaft 16 and driven shaft 13 is by setting sleeve 2, lining 3 and locking nut 4 are fixedly connected on the pump housing 7, the screw-casing 5 that on driving shaft and the driven shaft there is cover, 6 adopt the peek material.Between driven shaft 13 and the screw-casing 6 adjusting nut 8 is installed.

During use, motor is supplied with two screw pump power rotates driving screw (being comprised of driving shaft 16 and screw-casing 5), and drive sub-screws (being formed by driven shaft 13 and screw-casing 6) by driving gear 17, driven gear 18 and rotate, driving screw and sub-screw be intermeshing to be made and consists of one by one continuous each other Seal cage between spiral chute on the screw rod and the pump housing 7 inwalls, the sealing chamber has suction, continuous rotation along with screw rod, Seal cage has no to stir the vertically forward promotion of continuous and stable of ground and moves one by one, thereby realizes the purpose of pumping.

Claims (2)

1. explosion-proof twin-screw Strong self priming pump, comprise the pump housing (7), inflow entrance and outflow opening, the pump housing (7) is provided with cover plate (1), setting sleeve (2), lining (3), mechanical seal (9), positioning ring (10), connecting plate (11), machine sealed cover (12), driven shaft (13), bearing gland (14), roller bearing (15), driving shaft (16), driving gear (17), driven gear (18), gear nut (19), carriage (20), double-row angular contact bal bearing (21), stifle (22), bearing nut (23) and transparent cover (24), wherein driving shaft (16) and driven shaft (13) are realized linkage action by driving gear (17) and driven gear (18), one end of driving shaft (16) and driven shaft (13) overlaps respectively screw-casing (5,6), the other end of driving shaft (16) and driven shaft (13) is by setting sleeve (2), lining (3) and locking nut (4) are fixedly connected on the pump housing (7), it is characterized in that: the screw-casing (5 that on driving shaft and the driven shaft there is cover, 6) adopt the peek material.

2. explosion-proof twin-screw Strong self priming pump as claimed in claim 1 is characterized in that: between driven shaft (13) and the screw-casing (6) adjusting nut (8) is installed.

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