CN1080366A

CN1080366A - Anticorrosion submerged pump

Info

Publication number: CN1080366A
Application number: CN 92108467
Authority: CN
Inventors: 冯逸骅
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-06-19
Filing date: 1992-06-19
Publication date: 1994-01-05

Abstract

The present invention be a kind of pump and motor combination the anticorrosion submerged pump in same pump case.Main feature is in the pump case that is made of import pump case, the pump housing and outlet pump case, and its pump housing and outlet pump case are double layer construction; Motor stator is loaded on the pump housing inner casing, and by the forward and backward seal ring and the pump housing that are arranged on the stator two ends, the seal ring on the outlet pump case cooperates the formation static seal, and motor stator and rotor are separated; Rotor goes out the perfect sealing system of the common composition of axle head mechanical dynamic seal that is equipped with and the waveform bellows pressure adjusting structure that exports the pump case center, makes pump of the present invention can make the Under Water Pumps of Korrosionsmedium.

Description

Anticorrosion submerged pump

The present invention relates to pump, be a kind of with motor combination be the pump of feature.

The pump that is used for work under the chemical industry Korrosionsmedium liquid at present has corrosion-resistant Under Water Pumps.The pump parts of this corrosion-resistant Under Water Pumps are worked under liquid level, but motor works on liquid level, and middle the connection by the long pass moving axis drives.This Under Water Pumps with long pass moving axis, its transmission shaft is longer, though major axis can be coated with fluoroplastic, middle with the bearing supporting, but still is difficult to avoid major axis that vibration takes place and is difficult to solve the etching problem of bearing connecting part; And, though the motor of this Under Water Pumps is worked on liquid level, but still be enclosed in the aggressive atmosphere, must adopt specific type of electric machine.So the working depth that existing corrosion-resistant Under Water Pumps can be under liquid is limited, and has shortcomings such as weak point in working life, complex structure, cost of production height.Submersible pump of the prior art adopts the complicated mechanical motive sealing between its pump chamber and the motor cavity, both-end sealing commonly used also is filled with oil or aqueous rust preventive and so on liquid medium in the motor cavity.But because pump chamber pressure changes, or motor cavity produces variation in pressure because medium heat expands, and often causes mechanical dynamic seal device both sides that pressure reduction is greatly arranged, thereby improved the requirement to mechanical dynamic seal, makes complex structure, the cost raising during work of this submersible pump.And the motor radiating of this pump finally is to rely on motor housing diving under water, dispels the heat its poor effect in the natural convection mode.The applicant July nineteen ninety to Patent Office of the People's Republic of China application and to be awarded a Patent right patent No. be " the whole centrifugal electric pump of two water-cooleds " patent of 90207417.2, it is a kind of pump and motor combination to be integral pump into feature, its main structure is: water pump cover and electric machine casing directly are connected, the main shaft of impeller extends in the electric machine casing, and with two sliding supported conditions that are arranged on the forward and backward cover plate of electric machine casing, main shaft between these two sliding bearings is provided with rotor, and motor stator then is fixed on the electric machine casing.The electric pump of this structure can or be made submersible pump usefulness in order to conveying general fluid medium, but also is not suitable for as the Under Water Pumps of carrying Korrosionsmedium.

The objective of the invention is for a kind of anticorrosion submerged pump is provided, make pump and motor all can place Korrosionsmedium, thereby major axis structure and the etching problem that overcomes the bearing connecting part have been avoided, expensive specific type of electric machine be need not select for use, the normal sealing problem that causes because of the thermal expansion of motor cavity medium that takes place of submersible pump and the heat dissipation problem of motor also solved simultaneously.

For achieving the above object, the present invention also adopts pump and motor integration structure, and special design has been done in aspects such as the cooling of motor, sealing, insulation.Concrete structure is: pump case of the present invention comprises import pump case, the pump housing and outlet pump case, and the three axially connects in turn.The pump housing is designed to have the double-layer shell structure of concentric inside and outside shell, is wing radial rib with section therebetween inside and outside shell is fused, and then becomes the ring runner with guide-ring between the inside and outside shell of the pump housing; Pump housing inner casing one end (front end) is provided with the cylindrical shape center base.The pump housing two ends of this double-layer shell structure are connected with the import pump case respectively and have the outlet pump case of cylindrical shape center base, and inlet/outlet is positioned on the same axis; Rotating shaft is by forward and backward sliding supported condition heart among pump housing inner casing center base and outlet housing center base; Adopt the mechanical dynamic seal device between rotating shaft and pump housing inner casing, the one end disposes pump impeller after passing dynamic seal apparatus.Motor stator among the present invention is fixed within the pump housing inner casing on the circle, and the rotor corresponding with stator is fixed in the rotating shaft of disposing impeller, and this rotor is with japanning or plastic-coated insulation, corrosion protection.In the present invention, the motor stator two ends are equipped with stator end plate and the forward and backward seal ring that nonmagnetic substance is made, before this, increasing back sealing ring is positioned respectively in the interior circle of stator end plate, and be pressed on by forward and backward seal ring on the center base of pump housing inner casing center base and outlet pump case, constitute static seal structure.In the mill, in motor stator circle and with the connecting part of stator end plate and forward and backward seal ring all with sealant and insulated paint or plastic-coated filling gap so that seal, then motor stator just separates with rotor, can't seepage; Japanning or plastic-coated on the rotor.See thus, the stator among the present invention and rotor by pump housing inner casing and with it mutually the rotating shaft of sealing sealed in the close inner chamber (motor cavity) at pump housing inner casing, so pump chamber and motor cavity are effectively to isolate; Be full of liquid oil in the motor cavity.Heating value in the motor cavity is cooled off by the pump main flow in the ring runner on the pump housing.Owing to can influence the reliability of rotor axis mechanical motive sealing in the pump chamber in variation in pressure or the motor cavity during because of factor generation variation in pressure such as thermal expansions, so also comprise that one makes that mechanical dynamic seal device pressure at both sides reaches balanced pressure-equalizing device in the rotating shaft among the present invention, this pressure-equalizing device can be a kind of free-piston with seal ring of device in the outlet pump case, also can be to isolate elastic film or isolate elasticity waveform bellows, after this pressure-equalizing device has been arranged, when in variation in pressure in the pump chamber or the motor cavity during because of factor generation variation in pressure such as thermal expansions, pressure-equalizing device is subjected to displacement, can regulate the volume and the pressure of motor cavity, by the pressure transmission effect of motor cavity topping up, make the isostasy of the mechanical dynamic seal both sides of rotating shaft place.

Mechanical dynamic seal device among the present invention mainly comprises rubber oil seal with reinforce and the cover of obturaging.The cover front end of obturaging has tooth, in its circular groove with axial embedding impeller back, on interior circle of this cover of obturaging and drive the circular groove that is shaped on some cross-distribution on the cylindrical of impeller hub, and the tortuous mazy type that between by the tooth portion of the cover front end of obturaging and rubber oil seal with reinforce, constitutes obturage be filled with in the chamber viscosity big and with the immiscible also sealing medium of chemical reaction not of the working medium of pump.This sealing medium can adopt lithium grease or adhesive seal media such as molybdenum disulphide grease or fluorine fat.

Therefore advantage of the present invention is, the pump housing is a double Shell, and has the ring runner of guide-ring, and the turnover of flowing is little, and then flow resistance is little; The heating value of motor stator, rotor is subjected to the cold by force fast of main flow in the pump housing, and good cooling results is so the present invention has higher efficient, energy-conservation good; Owing to adopted pressure-equalizing device, made mechanical dynamic seal device working stability reliable; Forward and backward seal ring on the motor stator separates motor stator and rotor, and this has just guaranteed the sealing and the insulation of motor.See thus, the present invention has done integrated design to pump and motor, and for satisfying requirements such as cooling effect, sealing, insulating properties and pressure balance, the present invention has made above-mentioned particular design to relevant parts, so the present invention can be used as the submersible pump of work under the Korrosionsmedium liquid.

Below in conjunction with the accompanying drawing illustrated embodiment the present invention is further described.

Description of drawings:

Fig. 1 is a sectional view of the present invention.

See that by figure import pump case 1, the pump housing 2 and outlet pump case 6 link in turn.Impeller 12 is housed in the import pump case 1.The pump housing 2 is for to have the double-layer shell structure of concentric inside and outside shell, and is wing radial rib with section inside and outside shell is connected to one, is ringwise pump housing runner between then inside and outside shell, and the inner casing front end has a cylindrical circular center base 21.Also for useful radial rib connects the double layer construction with ring runner, its endothecium structure constitutes the cylindrical shape center base 5 of outlet pump case 6 to outlet pump case 6.Motor stator 3 is installed on the inner casing of the pump housing 2, the stator end plate 15 and 16 that two ends have electrician's glue worker of thickening to do, forward and backward seal ring 14 and 17 is positioned respectively in the interior circle of two stator end plates 15,16, and is combined on the cylindrical of cylindrical shape center base 5 of the center base 21 of shell within the housing 2 and outlet pump case 6 through

seal ring

13 and 18 clamping sleeves respectively; Motor stator 3 interior circles are with high solid epoxy insulation varnish filling clearance seal, with the connecting part of stator end plate 15,16, forward and backward seal ring 14,17 polyurethane kind adhesive adhering and sealing.Rotor 4 is assemblied in the same rotating shaft 8 with impeller 12, and rotating shaft 8 is supported in the

center base

21 and 5 of the pump housing 2 and outlet pump case 6 by front and back sliding bearing 9,7; Dress was with impeller 12 after rotating shaft 8 anterior extension ends passed the mechanical dynamic seal device.Rotor 4 is coated with behind the water-fast insulated paint coated nylon again, fills machinery oil in the cavity 20 all around.See by figure, in the cylindrical shape center base 5 of outlet pump case 6 the rubber waveform bellows that the forward and backward pressure of mechanical dynamic seal device is played the adjustment effect is housed.Mechanical dynamic seal device in the present embodiment comprises rubber oil seal with reinforce 10 and has the cover 11 of obturaging of sealing teeth, in the circular groove that this cover 11 of obturaging is shaped on axial embedding impeller 12 backs by sealing teeth, and, also be shaped on some circular grooves on the interior circle of cover 11 of obturaging and on the periphery of impeller 12 wheel hubs correspondingly, both cross-distribution, this just makes and begins to be full of lithium grease in the present embodiment to constituting tortuous labyrinth sealing between the rubber oil seal with reinforce 10 in the labyrinth from the cover 11 tooth portions of obturaging.

Claims

1, a kind of pump and motor combination the anticorrosion submerged pump in same pump case, pump case comprises import pump case, the pump housing and outlet pump case, the import and export of pump are positioned on the same axis, impeller and rotor are assemblied in the same rotating shaft, rotating shaft is passed through forward and backward sliding supported condition in the pump case center, and dress is characterized in that with impeller after the one end passed the mechanical dynamic seal device:

(1) pump housing 2 is wing radial rib with section inside and outside housing is fused for having the double Shell of concentric inside and outside shell;

(2) motor stator 3 is fixed on the interior circle of the pump housing 2 inner casings, two ends are equipped with stator end plate 15,16 and the forward and backward seal ring 14,17 that nonmagnetic substance is made respectively, before this, increasing back sealing ring 14,17 is positioned respectively in the interior circle of stator end plate 15,16, and is pressed on by forward and backward seal ring 13,18 on the center base 21 and outlet pump case center base 5 of the pump housing 2 inner casings; Use sealant and insulated paint filling gap on the inner ring of motor stator 3 and with the connecting part of stator end plate 15,16 and forward and backward seal ring 14,17;

(3) comprise that also one makes mechanical dynamic seal device pressure at both sides in the rotating shaft reach balanced pressure-equalizing device.

2, according to the described anticorrosion submerged pump of claim 1, it is characterized in that said pressure-equalizing device can be arranged on a kind of free-piston with seal ring in the outlet pump case, also can be to isolate elastic film or isolate elasticity waveform bellows 19.

3, according to claim 1 or 2 described anticorrosion submerged pumps, it is characterized in that said mechanical dynamic seal device mainly comprises rubber oil seal with reinforce 10 and the cover 11 of obturaging, cover 11 front ends of obturaging have tooth, in its circular groove with axial embedding impeller 12 backs, the circular groove that some cross-distribution are arranged on the wheel hub periphery of cover 11 interior circle and impeller 12 of obturaging, and the tortuous mazy type that constitutes between by the tooth portion of cover 11 front ends of obturaging and rubber oil seal with reinforce 10 is obturaged and is filled with the adhesive seal medium in the chamber.