CN2407166Y - Impeller structure of centrifugal pump - Google Patents

Abstract

The utility model relates to an impeller structure of centrifugal pumps, which comprises an impeller hub, a back cover, a front cover, and a plurality of blade bodies. Every blade body is provided with a front combination sheet fixed on the front cover, a rear combination sheet fixed on the back cover, a blade between the front combination sheet and the rear combination sheet. The end of the front combination sheet which enters a flow opening is provided with a notching part to make the front end of the front combination sheet not project to the circumference of the front cover when the blade bodies combine the front cover. One end of the rear combination sheet near a shaft center is provided with an arc-shaped front edge which can just close up to the outer edge of the impeller hub. By the design of the notching part and the arc-shaped front edge, the smooth degree of the surface of the side of a flow inlet of the impeller can be kept, and turbulization can not be generated easily.

Description

The blade wheel structure of centrifugal pump

The utility model relates to a kind of blade wheel structure of centrifugal pump, refers to especially a kind ofly avoid impeller to go into the head piece place producing turbulent flow to improve pumping usefulness, and can carry out the pinpoint blade wheel structure of blade body easily.

The blade wheel structure of present centrifugal pump, in the consideration emphasis on it manufactures and designs, the pumping usefulness of impeller and the assembling and the orientation problem of blade body quite come into one's own.Because impeller is directly connected to runner smooth degree and pumping usefulness in the surperficial smooth-going degree of the oral-lateral that becomes a mandarin, therefore, how to avoid producing the height surface and causing turbulent flow at the impeller oral-lateral that becomes a mandarin, be the important topic that centrifugal pump impeller designs.Also owing to the blade body that is equiped with on the impeller more than at least six, and blade body is again to present irregular volute structure, so be not easy on the location when assembling, in case the location inaccuracy of blade body also will directly cause the reduction of impeller pumping usefulness.

And, known blade body back of the body lid, owing to be to make with metal plate punching, not only structural strength is relatively poor relatively for its large-area back of the body lid outer rim, and easily produce fold phenomenon (planeness is relatively poor), this kind effect is hour more obvious at the specific speed (Specific Speed) of impeller (pump).Prior art all need be strengthened intensity in the mode that thickens back of the body lid, and carries out secondary operations with the higher turning processing mode of cost in addition and carry on the back the precision of covering outer rim to promote, and this will further reduce competitive ability, so still have the space of further improvement.

As U. S. Patent the 5th, 082, the blade wheel structure that discloses for No. 425, be on back of the body lid (vanedcover plate), some arcuation fold (corrugation) structure to be set, the rough bottom corresponding to blade body (vane) of the position of this arcuation fold and external form (base) is therefore as long as aim at the location work that the formed recess of arcuation fold just can carry out blade body with blade body.But, because the course of working that the difficult design of this kind arcuation fold and needs are comparatively accurate, even and tool that still must be complicated behind the blade body location remains fixed in this location upward to carry out welding job with blade body, this will significantly increase the design and manufacturing processing cost of back of the body lid, and be unfavorable for the competitiveness of product in market.And, U. S. Patent 5,082, No. 425 blade wheel structure, the blade body front end of its impeller oral-lateral that closely becomes a mandarin, still can't cover fully and develop in impeller boss (hub) leading edge and impeller suction portion (suction port), cause it to go near the impeller surface of head piece and produce high or low unsmooth surface because of blade body (vane) with combining of impeller boss (hub) and suction portion (suction port), fluid very easily produces turbulent phenomenon when flowing through than a position.The personage who generally knows centrifugal pump all knows, go into the head piece place if turbulent flow takes place at impeller, its influence for pumping usefulness is the end (comparatively big external diameter end) much larger than impeller, so U. S. Patent the 5th, 082, though No. 425 blade wheel structure has the validity on the location, desire to fail to solve turbulent flow and produce the problem that causes pumping usefulness to reduce.

German patent DE 44 46 193 C2 number disclosed blade wheel structure is to be combined between preceding, the back of the body lid to form this impeller in the mode of laser bonding by a plurality of laminar whirlpools type blade body.This kind mode can solve blade body in impeller become a mandarin the be uneven sliding surface and the turbulent phenomenon that junction plane produced of oral-lateral, can therefore obtain than U. S. Patent the 5th, 082 No. 425 better pumping usefulness.Yet, the shortcoming that it is maximum can't be incorporated on the impeller in traditional spot welding mode except being its blade body, and needs to carry out outside its manufacture cost significantly increases with the laser welding, the orientation problem of its blade body is also relatively more thorny, therefore also still has further room for improvement.

Main purpose of the present utility model, provide a kind of blade wheel structure of centrifugal pump, it has smooth-going and difficult the generations turbulent flow in impeller inlet flow oral-lateral surface, higher relatively, the no part of pumping usefulness cost simple in structure, easy to manufacture is relatively low, and the easy but validity in the location of blade body is relatively than advantages such as height.

In order to achieve the above object, in a preferred embodiment of the blade wheel structure of centrifugal pump of the present utility model, this impeller comprises: an impeller boss, be incorporated into the back of the body lid of this impeller boss, its front end is provided with a protecgulum of going into head piece, and a plurality of blade bodies, each blade body all has the preceding bonding pad that is fixed in protecgulum, be fixed in the back bonding pad of back of the body lid, and the blade between preceding bonding pad and back bonding pad, before being incorporated into this by a plurality of blade bodies, carry on the back between the lid with before inciting somebody to action, separated by spaces between the back of the body lid becomes the pumping runner of a plurality of volutes, and this blade wheel structure is characterised in that:

At the preceding bonding pad of blade body near an end of going into head piece, design has all oral areas, make when the preceding bonding pad combination of blade body is fixed on the protecgulum, the end of preceding bonding pad tool notch can't be protruding to the periphery that protecgulum is closely gone into head piece, can make that when impeller rotation pumping fluid fluid can be comparatively swimmingly enters in the impeller and is difficult for producing choked flow from going into head piece;

Bonding pad is than the end near the axle center after blade body, design has an arcuation leading edge, the outer rim that this leading edge just can be close to impeller boss is for Primary Location, and this structure also can keep impeller to keep the smooth-going state of runner and avoid turbulent flow to produce in going into the nearly impeller boss part of head piece; And, front end in the back bonding pad is provided with a blade body equalizing orifice near this arcuation leading edge place, its position just covers on one of the set equalizing orifice corresponding to the back of the body, near the rear end of back bonding pad, then be provided with a positioning hole, by this blade body equalizing orifice and positioning hole, the blade physical efficiency accurately is positioned between preceding, the back of the body lid easily, and when assembling, need only and pass this blade body equalizing orifice and positioning hole respectively with pre-designed tool (can have protruding fastening), just essence has been finished the accurate location of blade body, and very simple and convenient and cost are low.

The preferably, near the arcuation leading edge of the back bonding pad of blade body, further be provided with: one radially cuts edge, it is positioned at the side of arcuation leading edge away from blade, and, when a plurality of blade bodies are located between preceding, the back of the body lid, radially the cutting edge all of each blade body along the radial direction extension in axle center, and the front end of the arcuation leading edge of a back blade body (its have radially corner cut) just can be little by or approach the radially side cut of previous blade body, interfere and prevent that turbulent flow from producing avoiding.

The preferably, the outer periphery at back of the body lid form an outer rim flanging structure by stamping process, except that avoiding carrying on the back the outer periphery generation fold of lid, more have concurrently to strengthen and carry on the back the effect of covering structural strength and dimensional accuracy.

The preferably, this impeller also includes an increasing back sealing ring, it is incorporated on back of the body lid and the impeller boss, also be provided with the increasing back sealing ring equalizing orifice in increasing back sealing ring corresponding to the position of carrying on the back the equalizing orifice that covers, it further comprises: the part that is incorporated into impeller boss in increasing back sealing ring, form an erose interior ring structure by punching press, to promote the concentricity between increasing back sealing ring and the axle center and to combine precision.

Brief description of drawings

Fig. 1 is the stereo appearance figure of a preferred embodiment of the blade wheel structure of centrifugal pump of the present utility model.

Fig. 2 is the generalized section of blade wheel structure as shown in Figure 1.

Fig. 3 is the front elevation of blade wheel structure as shown in Figure 1.

Fig. 4 is a blade body upper viewing view of blade wheel structure of the present utility model.

Fig. 5 is the three-dimensional view of blade body shown in Figure 4.

Fig. 6 is the rear view of increasing back sealing ring of the present utility model.

The preferred embodiment explanation:

See also Fig. 1, Fig. 2 and Fig. 3, wherein shown a preferred embodiment of impeller 1 structure of centrifugal pump of the present utility model, this impeller 1 can be sleeved on the axis of rotation (not shown), rotates to reach the purpose of pumping fluid in a pump case (not shown) by axle center impeller 1.Wherein, Fig. 1 is the stereo appearance figure for a preferred embodiment of impeller 1 structure of centrifugal pump of the present utility model, and Fig. 2 is generalized section, and Fig. 3 is the front elevation of preferred embodiment for this reason then.

In this preferred embodiment, this impeller 1 structure comprises: an impeller boss 10, a back of the body cover 20, one increasing back sealing ring 30, a protecgulum 40 and a plurality of blade body 50.Hold (left-hand end of Fig. 2) to be provided with one before the protecgulum 40 and go into head piece 41.Elements such as aforesaid back of the body lid 30, increasing back sealing ring 20, protecgulum 40 and blade body 50 are to be made for preferablely with panel beating, but also may be with casting or the CNC person of being processed into.Between aforementioned each element, interfix with suitable combination (for example weld, gummed etc.) again and form this impeller 1.

This impeller boss 10 has an axis hole 11, can be fixed on the axle center (not shown) and is subjected to its driven rotary by a square key (not shown) cover.

This back of the body lid 30 is incorporated into impeller boss 10, cover the back of the body lid equalizing orifice 31 that 30 appropriate position is provided with some small apertures in the back of the body, carries on the back the hydrodynamic pressure that covers 30 forward and backward both sides (and arranged on left and right sides shown in Figure 2) with order and can get appropriate balance, and avoid pressure reduction excessive.And, cover 30 outer periphery at the back of the body and can form an outer rim flanging 32 structures by the secondary stamping process, cover 30 the outer periphery generation fold phenomenon except that avoiding carrying on the back, more have enhancement concurrently and carry on the back the effect of covering 30 structural strengths and dimensional accuracy.Why need design this outer rim flanging 32 herein, mainly be because the back of the body of this plane ring-type lid 30 is made by panel beating, the accuracy to size when having influence on follow-up assembling in the trickle fold fluctuating (out-of-flatness) of edge generation easily sometimes.The utility model is by the secondary punching press, that is, earlier by the first time stamping process form the back of the body and cover the main structure part of 30 (not containing outer rim flanging 32), and then carry out also in addition shaping of while of punching press second time, form this outer rim flanging 32 of its outer periphery.Except outer rim flanging 32 structures itself help the lifting of structural strength, its secondary operations shaping also makes simultaneously that size, planeness and validity that the back of the body covers 30 outer periphery heighten.In like manner, in another preferred embodiment of the present utility model, the outer rim that also can be chosen in protecgulum 40 is set up an outer rim flanging (not shown), and have with back of the body lid outside the identical effect of edge flanging.

This increasing back sealing ring 20 is fixed in impeller boss 10 and the back of the body covers 30, as shown in Figure 6, increasing back sealing ring 20 is erose interior ring 21 structures that form by the secondary punching press, on the location that is sleeved on impeller boss 10, and increasing back sealing ring 20 also is provided with some increasing back sealing ring equalizing orifices 22 in the position that the back of the body that covers 30 corresponding to the back of the body covers equalizing orifice 31, passes through for fluid.Since interior ring 21 structures of increasing back sealing ring 20 of the present utility model be with the secondary punching press make (outward appearance main body, the punching press for the second time that punching press for the first time forms increasing back sealing ring 20 form should be erose in ring 21 structures also carry out shaping simultaneously), so dimensional accuracy is preferable, and the assembling and positioning between the impeller boss 10 is also easier.And, when increasing back sealing ring 20 is assembled with the axle center (not shown), ring 21 structures more can be guaranteed concentricity between seal ring 20 and the axle center and the radially perpendicularity between impeller outlet and the axle center in this was erose, and therefore the fluid pumping usefulness with impeller also has close association.

A plurality of blade bodies 50 are before being incorporated into this, the back of the body cover between 40,30, with preceding, carry on the back the pumping runner that the separated by spaces of covering between 40,30 becomes a plurality of volutes.Each blade body 50 includes a preceding bonding pad 51 that is fixed in protecgulum 40, be fixed in the back of the body cover 30 back bonding pad 52 and be connected in before bonding pad 51 and the back blade 53 between the bonding pad 52, and make the section of blade body 50 form the configuration of a similar Z font (or anti-Z font).

As Fig. 4 and shown in Figure 5, hold at the back bonding pad 52 of blade body 50 near one of impeller boss 10 (axle center), include an arcuation leading edge 521 and and radially cut edge 523.The external form of this arcuation leading edge 521 roughly cooperates the size shape of impeller boss 10 outer rims, and its extended length just is matched with the quantity of blade body 50 and five equilibrium is (for example in addition with impeller boss 10 outer rims, blade body 50 quantity of this preferred embodiment are six, so the length of arcuation leading edge 521 can be surrounded the angle part about 60 of impeller boss 10 outer rims are spent just approximately), its outer rim that just can be close to impeller boss 10 is for the most preliminary location, and the plane smoothness of part that can keep the nearly impeller boss 10 of impeller input head piece is to avoid the generation of turbulent flow.And, near this arcuation leading edge 521, being provided with a blade body equalizing orifice 524, its position is just covered on the equalizing orifice 31 corresponding to the back of the body that the back of the body covers on 30, and back bonding pad 52 is in then being provided with a positioning hole 522 near the end (being the rear end) away from arcuation leading edge 521.By this arcuation leading edge 521 and blade body equalizing orifice 524, can make blade body 50 can accurately be positioned preceding, the back of the body easily and cover between 40,30.So, when carrying out blade body 50 and the back of the body when covering 30 be assembled, only need that each blade body equalizing orifice 524 of each blade body 50 is aimed at each back of the body respectively and cover equalizing orifice 31 (tool that also can be not shown in the figures with pre-aligned locating stud, cover 30 rear sides by the back of the body and pass positioning hole 522 and blade body equalizing orifice 524 respectively) with locating stud not shown in the figures, just can reach the accurate location work at blade body 50 two ends easily, so just, can be very easily and accurately with blade body 50 assemblings, be positioned the back of the body and cover on 30, very easy and cost is low.

The part that is in close proximity to the blade inlet edge 531 of blade 53 in arcuation leading edge 521 is provided with a corner cut (unnumbered) radially, and cutting edge in the footpath 523 then is to be positioned at the side of arcuation leading edge 521 away from blade inlet edge 531.By this kind structure, when a plurality of blade bodies 50 be located in preceding, the back of the body cover 40,30 between the time, the radially corner cut of each blade body 50 is all extended along the radial direction in axle center with 523 generals that radially cut edge, and the radially corner cut of a back blade body 50 just can littlely lean on (or approaching) in the radially side cut 523 (as shown in Figure 3) of previous blade body 50, not only avoid the generation interfered, and the smooth flat degree that more can keep impeller to go into head piece end (that is the end positions of blade inlet edge 531) paraxial heart place takes place to avoid turbulent flow.The utility model is provided with blade body equalizing orifice 524 by blade body 50 corresponding to the place that the back of the body covers equalizing orifice 31 positions, and the design of positioning hole 522, and the position structure of collocation arcuation leading edge 521, to make the validity of assembling location of blade body 50 of the present utility model heighten, but assembly program is easier relatively, and element (for example back of the body lid) structure is also oversimplified all the better, has overcome the defective of prior art fully.

In addition, the utility model bonding pad 51 before blade body 50 is held near one of blade inlet edge 531 (or going into head piece 41), be provided with all oral areas 511, the preceding bonding pad 51 that makes blade body 50 is when being fixed on the protecgulum 40, this end that preceding bonding pad 51 has notch 511 can't be protruding to the periphery that protecgulum 40 is closely gone into head piece 41, so can present smooth-going surface near blade inlet edge 531 and protecgulum 40 connecting parts, can make when impeller 1 rotation pumping fluid, fluid can enter in the impeller 1 from going into head piece 41 comparatively swimmingly, and is difficult for producing choked flow and turbulent flow.As shown in Figure 4, the position of the notch 511 of bonding pad 51 and size before being somebody's turn to do, in this preferred embodiment, be to extend towards " radially " direction respectively with the central point 0 in axle center, make to present an angle α between notch 511 edges of blade inlet edge 531 and preceding bonding pad 51.In this preferred embodiment, the angle of this α angle is being good between about 10-30 degree angle.

Because impeller 1 structure of centrifugal pump of the present utility model, the configuration of its each element is all very simple, and each blade body 50 is by blade body equalizing orifice 524, positioning hole 522, the arcuation leading edge 521 and the 523 isostructural designs of radially cutting edge, make the not only very simple and easy and location of the assembly working of blade body 50 of the present utility model accurately, more significantly reduce the chance that turbulent flow produces, thus the utility model no matter in make or assembling on all more or less freely relatively, precision and cost lower.In addition, because notch 511, the arcuation leading edge 521 of blade body 50 and 523 etc. the design of radially cutting edge, more make the utility model in blade inlet edge 531 two ends combine with protecgulum 40 and impeller boss 10 front ends locate near, all can present the smooth surface state, make pumping fluid be able to smooth and easy flowing through, in turbulent flow prevent that effect is better, pumping usefulness is higher, overcome the disappearance of prior art fully.

Certainly, the above is to utilize a preferred embodiment to describe the utility model in detail, and non-limiting scope of the present utility model, and those skilled in the art all can understand be, many appropriate changes and adjustment, still do not lose main idea of the present utility model place, also do not break away from spirit and scope of the present utility model.

Claims (5)

1. the blade wheel structure of a centrifugal pump can be sleeved on the axis of rotation, is rotated to reach the purpose of pumping fluid by the axle center impeller; This impeller comprises that an impeller boss, is incorporated into the back of the body lid of this impeller boss, its front end and is provided with a protecgulum and an a plurality of blade body of going into head piece, each blade body includes the blade of back bonding pad and between preceding bonding pad and back bonding pad that a preceding bonding pad, that is fixed in protecgulum is fixed in back of the body lid, by before a plurality of blade bodies being incorporated into this, between the back of the body lid the separated by spaces between preceding, the back of the body lid is become the pumping runner of a plurality of volutes, this blade wheel structure is characterised in that:

At the preceding bonding pad of blade body near an end of going into head piece, all oral areas are arranged, make when the preceding bonding pad combination of blade body is fixed on the protecgulum, this end that preceding bonding pad has notch can't be protruding to the periphery that protecgulum is closely gone into head piece, can make that when impeller rotation pumping fluid fluid can be comparatively swimmingly enters in the impeller and is difficult for producing in this position choked flow and turbulent flow from going into head piece;

At the back bonding pad of blade body near the end in axle center, be provided with an arcuation leading edge, this leading edge just can be close to the outer rim of impeller boss, and in being respectively equipped with near a blade body equalizing orifice and a positioning hole that approaches this arcuation leading edge near the two ends of blade body, the position of blade body equalizing orifice just covers on one of the set equalizing orifice corresponding to the back of the body, by positioning hole and blade body equalizing orifice the blade physical efficiency accurately is positioned between preceding, the back of the body lid easily.

2. the blade wheel structure of centrifugal pump as claimed in claim 1, it is characterized in that: comprise further near the arcuation leading edge of the back bonding pad of blade body being positioned at the corner cut and be positioned at the arcuation leading edge and radially cut edge radially that the arcuation leading edge is in close proximity to part of vane away from one of the side of blade, and when a plurality of blade bodies are located between preceding, the back of the body lid, the radially corner cut of each blade body is all extended along the radial direction in axle center with radially cutting edge, and the radially corner cut of a back blade body just can little radially side cut of leaning on or approaching previous blade body.

3. the blade wheel structure of centrifugal pump as claimed in claim 1, it is characterized in that: the outer periphery at back of the body lid are formed with an outer rim flanging structure by stamping process, except that avoiding carrying on the back the outer periphery generation fold phenomenon of lid, more have concurrently to strengthen and carry on the back the effect of covering structural strength and dimensional accuracy.

4. the blade wheel structure of centrifugal pump as claimed in claim 1, it is characterized in that: this impeller further comprises an increasing back sealing ring, the sealing ring is incorporated on back of the body lid and the impeller boss, also be provided with the increasing back sealing ring equalizing orifice at increasing back sealing ring corresponding to the position of carrying on the back the equalizing orifice that covers, be incorporated into the part of impeller boss at increasing back sealing ring, by punching press form one erose within ring structure, with the concentricity that improves seal ring and axle center and impeller and axle center in perpendicularity radially.

5. the blade wheel structure of centrifugal pump as claimed in claim 1, it is characterized in that: the position of the notch of this preceding bonding pad and size, central point with the axle center radially extends, and make and present an angle α between the notch edge of blade inlet edge and preceding bonding pad that the angle of this α angle is between the 10-30 degree.

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