Horizontal type multi-stage pump
Technical field the utility model relates to a kind of pump, especially for the multistage pump of carrying liquid.
Background technique is present, and along with the fast development of industries such as China's oil chemical industry, smelting, environmental protection and town water supply, the demand of high-lift horizontal type multi-stage pump is increased sharply.Existing multistage pump, particularly high-lift multi-stage pump, the key that influences its working life is a balance of axial force.Adopt the Equilibrator balancing axial thrust,, be prone to interlock, damage of bearings, the excessive problem of amount of leakage during operation because of the gap can't guarantee; Adopt the balancing drum balancing axial thrust, the remaining axial load that bearing bears is excessive, and bearing is short working life; Adopt the Balance disc balancing axial thrust, excessive because of the rotor axial pulsation, sealing mechanism is fragile.Simultaneously, horizontal type multi-stage pump also exists and rotor is carried out axial position adjusts difficulty, and impeller channel can't guarantee neutrality and influence hydraulic performance, and Bearing Installation and dismounting be difficulty, engineering time is long, maintenance cost is high deficiency relatively.
The summary of the invention the purpose of this utility model is to provide a kind of stable performance, long service life, installation and maintenance horizontal type multi-stage pump easily.
The purpose of this utility model is achieved in that a kind of horizontal type multi-stage pump, comprise: suction casing, discharge section, stage casing, stator, impeller, pump shaft, Equilibrator, pump shaft envelope parts, it is characterized in that at the two ends of pump shaft being that drive end and anti-drive end are respectively equipped with the roller bearing that bears radial load, anti-drive end also is provided with the angular contact ball bearing that bears thrust load, it is enclosed within on the bearing housing, but free floating radially; The bearing bracket stand of pump shaft anti-drive end adopts with bearing gland and is threaded.
Promptly relative with the load bearing pump shaft diameter in pump shaft two ends is less than the diameter in pump shaft stage casing, and the parts internal orifice dimension that is positioned at the pump shaft stage casing is greater than load bearing inner race external diameter.
Be provided with cooling tube in the bearing bracket stand oil pocket at pump shaft two ends.
The integrative-structure that equalizing feature in the Equilibrator adopts balancing drum to combine with Balance disc.
The utility model is to have changed the shaft strength mode on the basis of existing horizontal type multi-stage pump, and promptly bearing bears respectively axially and radial load, and the load of single bearing is reduced, and improves the working life of bearing; The non-driven-end bearing frame adopts with bearing gland and is threaded, and can greatly simplify installation procedure by the adjusting of swivel bearing gland realization to equalizing feature axial clearance; The location of Equilibrator and adjusting realize by adjusting ring, have eliminated because of the processing dimension accumulated error causes the improper installation requirement that can not satisfy pump of equalizing feature axial clearance value, and be easy to adjust.The integrative-structure that equalizing feature in the Equilibrator adopts balancing drum to combine with Balance disc has the biradial gap, reduces amount of leakage, has improved the efficient of pump, has guaranteed the balanced capacity of Equilibrator.Pump shaft is in the amount of scurrying that 0.1-0.25 is axially arranged, and the balanced capacity of balancing drum-dish in this scurries weight range is 0.9-1.5 times of the total axial force of pump shaft, and therefore, generally speaking, axial force can reach balance basically; The diameter of axle at pump shaft two ends is less than the diameter of axle at middle part, and under the condition that need not remove the load bearing inner race, the parts at just detachable pump shaft middle part bring convenience to maintenance.
Compare with existing horizontal type multi-stage pump, the utlity model has following advantage:
1, load is decomposed, bear radial load by the roller bearing that is located at the pump shaft two ends, the angular contact ball bearing that is located at pump shaft one end bears thrust load, has improved the working life of bearing.2, the equalizing feature in the Equilibrator adopts the balancing drum and the Balance disc structure combining form in biradial gap, and axial force can reach balance basically, has improved the reliability and the efficient of pump.3, bearing gland adopts with bearing bracket stand and is threaded, and is convenient to Equilibrator is regulated.4, the installation and removal of pump are extremely convenient, do not need special setting tool, and maintenance expenses is low.
Description of drawings Fig. 1 is a structural representation of the present utility model.
Embodiment is described further below in conjunction with accompanying drawing:
As shown in the figure, it is four-stage pump that present embodiment provides horizontal type multi-stage pump, is positioned at impeller 17, first stage impeller 19, the stator 18 in pump shaft 20 stage casings, and its outside pump housing suction casing 21, stage casing 16 and discharge section 15 are tightly connected mutually and are integral.The 14th, choma, pump housing two ends are connected with changeover portion 9,22, and this part structure is identical with existing multistage pump, is not describing in detail.The integrative-structure that equalizing feature in the Equilibrator has adopted balancing drum to combine with Balance disc, its outside is provided with balance set 13, axial clearance between balancing drum-dish 12 and balance set can realize that balance set is pressed on by balance set gland 30 and discharges section by swivel bearing gland 6.The end of Balance disc is provided with adjustment ring 11, adjusts the adjustment of the size realization of ring to the Balance disc axial position by change, and balancing drum-dish overlaps 31 location by snap ring 10 and snap ring.Be provided with pump shaft envelope parts 7 and load bearing on the pump shaft at pump housing two ends successively, the load bearing is to be made of two roller bearings 26 and angular contact ball bearing 4.The two ends that roller bearing is located at pump shaft are drive end and anti-drive end, are used for bearing radial load, and angular contact ball bearing is located at anti-drive end, are used for bearing thrust load.Angular contact ball bearing is located in the inside and outside bearing housing 2,3, between outer bearing sleeve 3 and the bearing bracket stand 5 certain clearance is arranged, and, can guarantee that so just angular contact ball bearing radially can float, so it only bears thrust load by stop pin 32 restriction outer bearing sleeves rotations.The bearing bracket stand 5 of anti-drive end adopts with bearing gland 6 and is threaded, so that adjust and maintenance.The bearing bracket stand 27 of drive end is connected by screw 24 with bearing gland 25.There is dustproof dish 23 end of gland.The end of bearing bracket stand is connected with oil sealing end cap 1.Be provided with disc 28 and cooling tube 29 in the oil pocket of bearing bracket stand, cooling tube is used for lubricant oil is cooled off for the coil pipe of logical cold water, guarantees the proper functioning of bearing.Promptly relative with the load bearing pump shaft diameter in pump shaft 20 two ends is less than the diameter in pump shaft stage casing, the internal orifice dimension of parts such as stuffing box gland 8, balancing drum-dish, impeller that is positioned at the parts in pump shaft stage casing such as axle envelope parts is greater than load bearing inner race external diameter, during these parts of installation or removal, can make things convenient for maintenance directly by the inner ring of roller bearing.