CN1019595B

CN1019595B - Centrifugal pump with oiling agent filtrating equipment

Info

Publication number: CN1019595B
Application number: CN91101247A
Authority: CN
Inventors: 弗雷德里克·W·布斯阿伦敦; 保罗·库珀
Original assignee: Ingersoll Rand Industrial US Inc
Current assignee: Ingersoll Rand Industrial US Inc
Priority date: 1990-02-06
Filing date: 1991-02-06
Publication date: 1992-12-23
Also published as: KR950006402B1; AU7305591A; CN1054650A; EP0513222A1; JPH05504810A; CA2075380A1; KR920703968A; WO1991012412A1; EP0513222A4

Abstract

A kind of shielding centrifugal pump motor driven is positioned at the group of magnets of hull outside, and the group of magnets that is positioned at the housing inboard connects with the impeller of pump and drives impeller.Bearing arrangement comprises a lubrication system that adopts pumping fluid as oiling agent and freezing mixture.The passage that is arranged in the pump case guides to each bearing with lubricating fluid.A strainer cover prevents that at above-mentioned groove fluid from carrying granule foreign and entering this groove, and the fluid in chamber rotation constantly washes away any granule foreign from filter surfaces, by fluid output they are drained.

Description

Centrifugal pump with oiling agent filtrating equipment

The present invention puts it briefly and relates to have the such centrifugal pump of the fluid of pumping as lubricating bearings.Canned motorpump is exactly an example of this type of pump, and it adopts one group of concentric rotor that has magnet, and the pump house wall of the sealed pumping fluid of magnet separates, to prevent spilling fluid from pump case.

Such pump requires the fluid lubrication internal bearings with cleaning; Because if be suspended with granule foreign in the lubricating fluid, the rate of fault of bearing is very high.For this purpose, supply fluid outside can using, but the fluid that such measure meeting dilution is pumped, and require independent fluid source and corresponding pipeline.

Similar scheme of the prior art is to extract the fluid that a part is pumped out, by delivering to each bearing behind the filter.Such filter requires frequent cleaning, and this pump that just need stop is removed filter, clears up or changes.For avoiding these difficulties, the pump of some prior art has adopted so-called flushing type filter or filter screen, and they are positioned at delivery side of pump, shunts and filters a part of fluid and then send into each bearing.Although this scheme has the advantage that makes the continuous washing and filtering device of pumping fluid, still have the shortcoming of the continuous erosion of fluid that filter is discharged from, cause frequently changing filter.

Another shortcoming of above-mentioned prior art is: a part of high-pressure spray of shunting is known from experience the efficient that reduces pump from the discharge fluid of pump.

Existing apparatus and the method narrated above have narrow limitation.Clearly, provide that a kind of to overcome above-mentioned one or more circumscribed alternative will be favourable.Therefore, provide a kind of suitable alternative, and more abundant disclosed technical characteristics below having.

U. S. Patent 4,871,301 relate to a kind of centrifugal pump, this pump comprises: a housing that contains pump chamber, one in this housing import and inlet passage and the outlet passage that leads to the outlet of this housing from pump chamber by this pump chamber, the axle that rotates in the bearing means that is installed in the described housing, one is installed in this front end with the coaxial pump impeller that rotates in pump chamber, and described housing has the passage of pumping fluid being delivered to this pump bearing arrangement from this pump chamber.

The object of the invention provides a kind of centrifugal pump, and its shunting part is pumped fluid bearing is lubricated, and with the fluid that the filtrating equipment filtering distributes, it can overcome the problem that causes in the prior art.

More particularly, the object of the invention provides a kind of pump, and it has a housing, and this housing comprises a pump housing and a pump cover, and they are linked together and form a pump chamber, and this housing also has the import and the outlet that supply pumping fluid to enter and discharge this pump chamber; Also have an impeller that is arranged in described pump chamber, the fluid of this pump chamber is passed through in its pumping, and discharges fluid with the pressure higher than the hydrodynamic pressure that enters this pump chamber by described import from described outlet; The axle that also has the described impeller of a supporting, it is bearing in the axle journal mode and is arranged in the outer bearing means of described pump chamber; Also having one distributes a part of fluid and fluid is delivered to the pipeline of bearing means to be lubricated from described pump chamber; And one cover the filter that leads to described pump chamber oral area at described pipeline, it filters the fluid that enters described pipeline, described filter bits is near a side of impeller, the outlet that is pumped fluid in described housing is inwardly located, cause in the pump chamber and the close fluid of described impeller face crosses this filter and flows at the surface of revolution of this place's impeller, so that make pump in operation process, wash away any granule foreign from this filter.

A further object of the invention promptly discloses a kind of pump and has had a pump case and a pump cover; 1. wherein said pump case and pump cover are paired being linked together, and 2. have relative face, have formed a pump chamber and an isolation ward between them; Impeller uses journal rest in described pump case; Described impeller is the rotor body with blade, is limited in rotationally in the described pump chamber; And wherein said pump cover has the device that an independent permission fluid enters described pump chamber, with one independent discharge the device of fluid from described pump chamber, described relative face is common to form the expedite fluid passage that between described pump chamber and described device for draining fluid we opens; Described isolation ward is turned unlimited towards the blade of described impeller; And also comprise the device that is formed in the described pump case, in order to fluid is imported described pump case and described pump chamber in proper order from described isolation ward.

The present invention relates to a kind of centrifugal pump comprises: a housing that contains pump chamber, one in this housing import and lead to inlet passage and an outlet passage that leads to the outlet in this housing from pump chamber of this pump chamber; One is installed in the interior bearing means of described housing so that the axle that rotates; One is installed in the pump impeller of this front end to rotate in pump chamber in company with this, and described housing has the passage of pumping fluid being delivered to this pump bearing arrangement from this pump chamber; It is characterized in that: described passage has an opening that leads to described pump chamber, it with the non-pumping face of described impeller adjoin mutually with accept from described adjacent pump chamber fluid partly; With a filter that is installed on the described housing, its topped opening at described passage, thereby make the fluid that enters described passage by filter and be filtered device and filter, fluid flows through described filter to be lower than the hydrodynamic pressure of arranging described delivery side of pump, and any granule foreign that is deposited on described filter surfaces all can be washed away from described filter surfaces by the fluid that crosses described surface by described impeller drive.

Above-mentioned and otherwise content will be clearer by coming below in conjunction with accompanying drawing the present invention is described in detail.But should be understood that the understanding on ground, accompanying drawing is not to be only to be usefulness in order to say something to the qualification of invention.

Brief description to drawing:

Fig. 1 is the cross sectional view of shielding centrifugal pump along the impeller rotating shaft of pump, and it depicts one embodiment of the present of invention;

Fig. 2 is the partial enlarged drawing of Fig. 1, and it shows impeller, housing lid connecting part and the part that is attached thereto, and comprises the topped filter that is directed at the pipeline import of pump bearing at pumping fluid;

Fig. 3 is the perspective view of filter and housing lid, and it shows that pumping fluid crosses the vortex motion of filter surfaces.

Shielding centrifugal pump shown in the drawings comprises that a pump case 1 this pump case contains 2, one pump chambers 3 of an axial inlet and an outlet 4, and they are passed the pump case runner entirely and are communicated with.Pump case 1 also comprises a mounting base 5 and the annular flange dish 6 around pump chamber 3.This annular flange dish 6 is suitable for bearing a cap 7, and it is around the shell 10 that can hold a set of pieces, and comprising the axially extended axle 11 that drives semi-open type pump impeller 12, when pump work, impeller 12 rotates in pump chamber 6.The specifically narration below of this shell 10.This half-opened impeller 12 comprises a cover plate 13 and a series of blade 14, and one side of blade 14 fuses with cover plate 13.

Powered support 16 is assemblied in the outside of shell 10, and is fixed on pump case 1 and the cap 7 with a series of bolts of arranging along flange plate 6 outer circumference 17.This powered support 16 comprises that also a mounting base 5 that is fit on pump case 1 supports the mounting base 18 of this pump.The a pair of axially spaced bearing 20 of live axle 19 usefulness and 21 is installed in rotation in this powered support 16, and bearing 20 and 21 is fixed on the both sides of support inner bearing chambers 22 16, and bearing chamber 22 is suitable for holding the oiling agent of bearing.This outer end of 19 is suitable for being connected on the drive motor (not shown) with common hitch bar.

Cap 7 is ring parts, and it slips in the pump case 1 interior groove around pump chamber 3, and has a flange 25 that overlaps with the flange plate 6 of being with the hole of accepting bolt 17.This annular flange flange 25 is clipped between the annular flange dish 26 of flange plate 6 and powered support 16 open ends, with bolt 17 cap 7 and powered support 16 is fixed on the pump case 1.

This shell 10 comprises a tube shell 30, and it is packed in the cap 7 and has a ring-shaped step 31, rests against on the exterior edge face of cap 7, is controlling the degree of depth that tube shell 30 stretches into cap 7.Tube shell 30 two ends have respectively the groove around antero posterior axis journal bearing sleeve 33 and 34.Impeller shaft 11 passes bearing housing 33 and 34, and the corresponding axle sleeve 36 and 37 of rotation in bearing housing 33 and 34 is housed.Axle sleeve 36 and 37 can slide with the thimble between them 39 on axle 11.

The front end of impeller shaft 11 has an outward extending flange 41, and thrust ring 42 rests against on the front-end face of flange 41 and front axle bearing sleeve 33.This thrust ring 42 is being controlled the axial motion backward of impeller shaft 11.Impeller 12 has a threaded piece 44, and it is screwed in the tapped hole of axle 11 front ends.Impeller 12 rests against on the shaft flange 41.47, one of thrust bearings are equipped with key connecting internal magnet clamp holder 50 and nut 52 that is screwed in the rear end of axle 11 with screw thread on axle 11 in axle 11 rear end.This nut 52 is locked at tube shell 30 with the swivel assembly of all shells 10.In and pass on the appropriate location of axle on 11 of bearing housing 33 and 34.

The periphery of internal magnet clamp holder 50 is equipped with series of magnets 58, and they are near the internal surface rotation of thin jar shape radome 59, and radome is contained in the outside of other part of magnet clamp holder 50 and shell 10.Powered support 16 comprises an external magnet clamp holder 61, and it is contained on the live axle 19 and along with being close to jar shape radome 59 and rotates.Internal surface around external magnet clamp holder 61 is equipped with the magnet 62 that a series of spacings separate, and the magnet 58 on they and the above-mentioned internal magnet clamp holder 50 forms magnetic and gets in touch, and the moment of torsion that external magnet clamp holder 61 is produced is delivered on the impeller shaft 11 of pump.Using the impeller of magnet drives pump by this way, is known in the canned motorpump prior art.

The annular groove 63 that is formed on its front-end face 66 is arranged on the cap 7, its threaded shaft 11 and be positioned at impeller 12 ear end face 68 near, with a fluid passage 64 of extending,, pumping fluid surrounds the chamber 60 that contains magnet clamp holder 50 so that being sent into jar shape radome 59 from pump chamber 3 with groove 63.This fluid flow to thrust bearing 47 from chamber 60, passes this thrust bearing, flows through the shaft bearing that comprises bearing housing 33 and 34 forward along axle 11 then, and the thrust bearing 42 near impeller 12 flows out from the axle 11.This fluid plays effect lubricated and that cool off each bearing.When the character that is pumped fluid is suitable for making oiling agent, just can uses and be pumped fluid as oiling agent.

Obviously, concerning lubricated fluid, should not contain granule foreign, to prolong the working life of bearing; Therefore, wish that granule foreign does not enter fluid passage 64 and chamber 60 by pump chamber 3.Otherwise granule foreign will deposit in the chamber 60 that comprises the space between bearing housing 33 and 34, and gathering of granule foreign can hinder the proper functioning of pump, even may damage the bearing of pump.For this reason, groove 63 tops are provided with it are covered on annular filter or filter screen 70; It is consistent with the gabarit shape of groove 63, is formed on the front-end face 66 of cap 7, enters the granule foreign of groove 63 with interception.

This filter 70 can be with any suitable mode installation in position in groove 63, and this does not plan to narrate as for details is installed.For example, available bonding or fix with threaded fastener.The starting point is to make such particulate matter neither to be detained also, and not erosion filter 70 is very important.For this reason, the present invention considers like this: even filter 70 is near the ear end face 68 of impeller 12.The rotation of impeller 12 causes that near the pumping fluids the rotor ear end face 68 do one's utmost with wheel rotation, causes a kind of scroll fluid that flows that sweeps away filter 70.This power has strengthened the scroll fluid that crosses filter 70, shows with arrow that in Fig. 3 this fluid can siphon away or sweep away the granule foreign that is blocked on filter 70 end faces, and it is taken away the fluid that all the other are pumped, and causticize filter 70 not.Be readily appreciated that heavier granule foreign may not be subjected to the pull of vacuum effect of above-mentioned filter 70, but also can be under deposition on the filter 70; On the contrary; Heavier like this granule foreign can outwards be thrown away by centrifugal force, and drains with pumping fluid.In fact, so heavier granule foreign or can not arrive filter 70 is because filter 70 is the positions that are positioned at away from being pumped main flow.Be filtered device 70 that tackled, that be enhanced with fluid vortex cross filter 70 those can find the lighter granule foreign that enters fluid passage 64 road warps just.

It should be noted that especially: in the pump of novelty of the present invention, between pump chamber 3 and discharge opeing outlet 4 without any obstruction.All are pumped fluid and all drain into outlet 4.Near the hydrodynamic pressure that hydrodynamic pressure in impeller 12 back exports 4 is low; This fluid is not the fluid that is pressurized to head pressure at first, but as the fluid through reducing pressure before the lubricating fluid, thereby reduced loss, and this being lost in when using the head pressure fluid to do to lubricate also can be taken place in the prior art.Exhausted do not have the fluid of discharge and circulate as oiling agent, without any need for outer loop agent pipeline or any outer confession circulation agent pipeline yet.The liquid speed that crosses filter 70 is starkly lower than the speed that outlet 4 discharge fluid may have that flows through when sweeping away filter.This just causes alleviating filter 70 erosion effects.The much bigger catchment area that may provide than the slip ring that is arranged on pump discharge or filter is provided the annular groove 63 of the shunting lubricating fluid that is provided.

Although the present invention has done to describe and narrate in conjunction with most preferred embodiment, will be appreciated that: under the prerequisite that does not break away from content of the present invention as claimed in claim, can also make some mutation and variation.

Claims

1, a kind of centrifugal pump comprises: a housing that contains pump chamber, one in this housing import and lead to inlet passage and an outlet passage that leads to the outlet in this housing from pump chamber of this pump chamber; One is installed in the interior bearing means of described housing so that the axle that rotates; One is installed in the pump impeller of this front end to rotate in pump chamber in company with this, and described housing has the passage of pumping fluid being delivered to this pump bearing arrangement from this pump chamber; It is characterized in that: described passage has an opening that leads to described pump chamber, it with the non-pumping face of described impeller adjoin mutually with accept from described adjacent pump chamber fluid partly; With a filter that is installed on the described housing, its topped opening at described passage, thereby make the fluid that enters described passage by filter and be filtered device and filter, fluid flows through described filter to be lower than the hydrodynamic pressure of arranging described delivery side of pump, and any granule foreign that is deposited on described filter surfaces all can be washed away from described filter surfaces by the fluid that crosses described surface by described impeller drive.

2, centrifugal pump according to claim 1 is characterized in that described housing has an annular groove that is formed on wherein, and it is relative with the non-pumping face of described impeller, and around the described axle that drives described impeller; And described filter is made of the annular filter screen of a topped described annular groove.

3, centrifugal pump according to claim 1 is characterized in that the ear end face of described filter near described impeller.

4, centrifugal pump according to claim 3, it is characterized in that described groove threaded shaft and be positioned at impeller ear end face near.