CN2527747Y - Impeller type centrifugal screening electric pump - Google Patents

Abstract

The utility model relates to a centrifugal electric pump, in particular to an impeller type centrifugal shielding electric pump. In the structure of the utility model, a pump and a motor are arranged on a motor shaft in a shell; a motor shell is connected by flange with a pump shell; the impellers of the pump are connected with the motor shaft by keys; an auger inducer is in key connection to the motor shaft in front of the impellers; a shielding sleeve is arranged between a rotor and a stator of the motor. With mechanical and electronic integration, compact structure, small size, light weight, no leakage, convenient maintenance, normal operation in negative pressure and good performance, the utility model can be applied for fluid delivery equipments in the industries of petroleum, chemical engineering, refrigeration and pharmacy.

Description

The propeller type centrofugal shielded electric-pump

The utility model relates to a kind of centrifugal electric pump, and particularly a kind of propeller type centrofugal shielded electric-pump is used for the equipment that industries such as oil, chemical industry, refrigeration, pharmacy are carried liquid.

Motor and pump are separated from each other in the present centrifugal electric pump.Axle between motor and the pump is connected and adopts connector, thereby need seal axle, and its complex structure, volume are big and easily produce the phenomenon of leakage.And the import of pump may quit work because of losing pressure reduction with outlet when whole system is in negative pressure state, influences the normal operation of system.

In view of the situation of above-mentioned technology, the purpose of this utility model provides a kind of propeller type centrofugal shielded electric-pump that a kind of energy can be obeyed above-mentioned shortcoming.

For realizing the purpose of this utility model, can realize by following technological scheme, the propeller type centrofugal shielded electric-pump, comprise motor and electric pump, pump and motor are with being contained in the housing, the impeller of pump, inducer, rotor is with being contained on the motor shaft, be fixedly connected with key with motor shaft, have suction inlet and Pai Kou on the impeller, inner chamber is provided with centrifugal dividing plate, the screw auger formula inducer of key connecting is housed on the motor shaft in the place ahead of impeller, between rotor and stator, housing is housed, two ports of housing are fixed on the flange of electric machine casing, electric machine casing connects with flange with the housing of pump, side at the pump housing is provided with liquid-inlet, opposite side at the pump housing is provided with liquid outlet, be provided with housing between the rotor of motor and the stator, can open the copper cash winding of stator and liquor separation to avoid the corrosion of liquid winding, in order to consider that this electric pump very easily is subjected to the influence of cavitation effect, therefore require the suction side that enough fluid column static pressures must be arranged, make and form pressure reduction between the import of liquid and the outlet and could guarantee that feed flow does not interrupt, electric pump can run well, make the pump can be in proper functioning under the negative pressure, so the impeller the place ahead at pump is provided with inducer, when pressure reduction is not enough, inducer in the placement can drain into liquid in the suction inlet of pump by force, discharge through centrifugal impeller again, guarantee the proper functioning of pump, the side that the import of liquid is located at the pump housing through L type runner to pump housing end face center, outlet is provided with along pump housing tangent line at the opposite side of the pump housing, an annular chamber is arranged for inducer work in the upper-end surface of L type runner.

Working principle of the present utility model: the import of pump enters pipeline with system liquid and is connected, and outlet is connected with the discharge pipe of system, and refluxing opening is connected with inlet line.Connect electric rear motor rotation impeller and inducer rotation, liquid is sucked, through the impeller centrifugal action liquid is discharged, wherein sub-fraction is in order to the inlet line of cooling off and lubricated liquid is got back to liquid from refluxing opening.

The utility model compared with prior art, with the impeller of pump and rotor and inducer with connecting with motor shaft with key, promptly be assemblied on the same axis, the shared housing of pump and motor, form electromechanical integration, so promptly do not need shaft sealing not need shaft joint yet, and get final product cooling motor Castor Oil bearing again by the liquid of motor; The copper cash winding of stator and liquid are separated to avoid the corrosion of liquid to winding; Compact structure, the little nothing leakage of boundary dimension, easy to maintenance makes enough proper functioning under negative pressure state of pump owing to be provided with inducer.Further improved pump performance, especially in refrigeration plant, when low-temperature condition, negative pressure appearance appears in system, and this electric pump runs well, so this pump can be finished general pump and finishes the operating mode that do not become in refrigeration system.

Fig. 1 is the vertical middle sectional view of the utility model;

Fig. 2 is a side view;

Fig. 3 is a plan view.

Specifically describe this suitable new embodiment below in conjunction with accompanying drawing:

As shown in drawings: electric machine casing 5 connects formation with the pump housing 1 with flange bolt and comprises that motor and pump are a housing, and the pump housing is established L type flow channel for liquids, and processing one in the upper end of runner can be for the annular chamber of inducer work.Electric machine casing 5 is a garden tubular steel welding construction, wherein cylindrical portions may is that the steel plate compacting is welded into type, the rear and front end is welded with the garden dish of steel plate system, in order to connect front and rear cover 4,12 and the pump housing 1 front cover 4 is gray iron casting, is provided with connecing of being connected with housing and coils and bearing hole, and axis hole is in order to an end of supporting axle, the blank of front cover 4 is promptly plastic after machined into, the rear end cover mouth also is a gray iron casting, is provided with connecing of being connected with housing simultaneously and coils and the withdrawing fluid outlet machined into moulding.

Electric machine casing 9 connects with the flange of the housing 1 of pump, motor shaft 9 extends in the pump housing, and the impeller 3 of pump is connected with key with motor shaft, and pump and motor are all a housing, electric machine casing 9 and pump housing housing 1 connect with flange, and the impeller 3 and the rotor 8 of pump are assemblied on the same axis.Impeller 3 is a gray iron casting, is shaped as the garden dish type, is cast with suction inlet and Pai Kou, and inner chamber has centrifugal dividing plate, and impeller 3 also must be done balance quality and handle after machined into.Be provided with stainless steel shielding cover 6 between rotor 8 and the stator 9, two ports are fixed on the forward and backward flange 13, being provided with a kind of screw auger formula inducer 2 in impeller 3 the place aheads of pump is contained on the motor shaft with key connecting, impeller 3 has suction inlet and Pai Kou, inner chamber has centrifugal dividing plate, inducer 2 is that a screw auger formula impeller is associated in motor shaft 9, together rotate at random, inducer 2 is after 1.5 millimeters corrosion resistant plate and stainless steel axle sleeve twine, welding tractor is made and is the garden Cylindrical object, is welded into by two screw auger blades and sleeve.

8 front ends of the rotor of pump prolong and one section diameter of axle, leave the shaft part that 2 equal in length are taken turns in an isogeneous induction after loading onto impeller, are tightened in order to inducer 2 usefulness nuts to be installed.Graphite bearing is a standard piece, is shaped as tubular, the fluid course groove is arranged so that liquid lubrication, and axle sleeve is moulding of stainless steel material machined into and nitriding treatment, and axle is No. 45 steel are made the finished product axle through machined into and heat treatment fastening impeller of front end and an inducer.

The assembling of pump: be assembled to motor stator 7 interference in half-finished housing right earlier, after the burn-on back termination dish of housing, carrying out secondary operations finishes, again housing is welded in the housing, carry out last shaping operation, will process each part after qualified and clean to purge and carry out integral installation after clean and join, earlier graphite bearing 11 is packed into the two ends of axle are fixed with pin, and the back termination dish that rear end cover 12 is added behind the asbestos washer with housing is connected and fixed with bolt.Rotor shaft is packed in the housing, front cover is penetrated axle to be gone up and housing front end land bolton, impeller is inserted in the axle that retainingf key is housed to be gone up inducer 2 is packed into before the impeller 3, locate with key, nut is tightened, armored pump body 1 usefulness asbestos washer housing front end connects uses bolton, and terminal box 10 is connected with bolt with housing.

Claims (1)

1, a kind of propeller type centrofugal shielded electric-pump, comprise motor and pump, housing 6 its two ports are housed between rotor 8 and the stator 7 to be fixed on the flange of electric machine casing 5 two ends, the L type passage that it is characterized in that the pump housing has an annular chamber, motor shaft 9 extends in the pump housing 1, the screw auger formula inducer 2 in the impeller 3 of pump and the place ahead thereof and motor shaft 9 are with key connecting, and electric machine casing 5 connects with the flange of the pump housing 1 housing.

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