CN210859356U

CN210859356U - Centrifugal pump impeller with good cavitation resistance

Info

Publication number: CN210859356U
Application number: CN201921544004.0U
Authority: CN
Inventors: 郭文彬
Original assignee: Anhui Olivier Pump Valve Machinery Co ltd
Current assignee: Anhui Olivier Pump Valve Machinery Co ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-06-26
Anticipated expiration: 2029-09-17

Abstract

The utility model discloses a centrifugal pump impeller that anti cavitation erosion nature is good belongs to centrifugal pump technical field, including semi-open impeller, semi-open impeller comprises impeller body and protection subassembly, impeller body includes blade and back shroud, protection subassembly including the attaching plate with outside convex protection die sleeve on the attaching plate, the inside cavity bottom opening of protection die sleeve sets up, the protection die sleeve with the size phase-match of blade just cup joints the outer wall of blade, the attaching plate passes through the screw fixation and the upper surface of back shroud, the middle part of attaching plate sets up the convex post, the top of convex post sets up the arc surface. The blades are protected by sleeving the protection component on the blades, the protection die sleeve of the protection component is identical to the distribution condition and size of the blades, and can be sleeved on the blades to protect each blade, so that the impeller body is effectively prevented from being damaged by cavitation erosion.

Description

Centrifugal pump impeller with good cavitation resistance

Technical Field

The utility model relates to a centrifugal pump technical field, in particular to centrifugal pump impeller that anti cavitation erosion nature is good.

Background

The centrifugal pump is a pump for conveying liquid by centrifugal force generated when an impeller rotates, and mainly comprises the impeller, a pump body, a pump shaft, a bearing, a sealing ring, a stuffing box and the like. It is mainly characterized in that: the device has the advantages of compact structure, wide flow lift range, uniform flow, stable operation, small vibration, lower equipment installation, maintenance and repair cost and the like, and the moving object has the phenomena of deformation and material degradation on the surface after being subjected to cavitation impact, which are also called degradation or cavitation. Cavitation is a complex phenomenon of fluid dynamics, materials science, and physico-chemistry. Cavitation erosion is surface damage generated by relative motion of a solid surface and liquid, usually occurs on the surfaces of water pump parts, water turbine blades, ship propellers and the like, impact waves which harm impellers and pump shells are transmitted during cavitation erosion, and the surface of the water pump parts can be enabled to have spots and cracks even fall off gradually in a spongy manner after a certain time under the combined action of micro-dissolved oxygen in the liquid on chemical corrosion of metal; when cavitation occurs, noise is generated, and the pump body vibrates; meanwhile, the apparent density of the liquid is reduced due to the generation of steam, so that the actual flow rate, the outlet pressure and the efficiency of the liquid are reduced, and the liquid can not be output at all in severe cases.

The damage of cavitation erosion to the impeller is controlled to traditional centrifugal pump adoption change impeller blade's contained angle usually, but can not avoid the production of cavitation erosion phenomenon completely, consequently blade direct contact liquid still can receive the cavitation erosion phenomenon to influence, long-time the use, the position of damage will be enlarged, thereby lead to the impeller to damage completely, and the blade and the integrative structure of back lid of traditional impeller in addition, can't solve through the soldering when the large tracts of land damage appears in the blade, consequently need the whole impeller of changing, the maintenance cost has also been improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at just in order to solve the direct and liquid contact of impeller of above-mentioned centrifugal pump, cavitation phenomenon damage impeller's problem appears in the during operation easily and provide a centrifugal pump impeller that cavitation erosion resistance is good, has through die sleeve and liquid contact, and the protection blade is not damaged, and the convenient change of protection die sleeve, advantage that economic more is suitable for.

The utility model discloses a following technical scheme realizes above-mentioned purpose, a centrifugal pump impeller that anti cavitation nature is good, including semi-open impeller, semi-open impeller comprises impeller body and protection subassembly, impeller body includes blade and back shroud, protection subassembly including the attaching plate with outside convex protection die sleeve on the attaching plate, the inside cavity bottom opening of protection die sleeve sets up, the protection die sleeve with the size phase-match of blade and cup joint the outer wall of blade, the attaching plate passes through the screw fixation and is in the upper surface of back shroud, the middle part of attaching plate sets up the convex post, the top of convex post sets up the arc surface.

Preferably, the blade and the rear cover plate are of an integral structure.

Preferably, the attaching plate and the protective die sleeve are of an integrated structure.

Preferably, the protective die sleeve is of a three-layer structure, the middle layer is a base layer, and the upper layer and the lower layer of the base layer are respectively a smooth ceramic layer and a rubber lining layer.

Preferably, the rubber lining layer is close to the blade.

Preferably, the width of one end of the protective die sleeve close to the attaching plate is gradually narrowed towards the top end.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the blade is protected by sleeving the protection assembly on the blade, the protection die sleeve of the protection assembly is identical to the distribution condition and the size of the blade, the protection die sleeve can be sleeved on the blade and protects each blade, the impeller body is effectively prevented from being damaged by cavitation erosion, the protection assembly is fixed on the impeller body through screws, and the protection assembly can be detached for replacement even if used for a long time and damaged by cavitation erosion on the surface, so that the impeller body is maintained more economically and conveniently.

2. The protection die sleeve is that the cover protects the blade on the blade, and the protection die sleeve adopts three layer construction, and the intermediate level is the basic unit, and the one deck that contacts the blade is the rubber inner liner, and the superficial layer is smooth ceramic layer, and smooth ceramic layer can prevent that the protection die sleeve from producing the bubble because of the surface is uneven, and the rubber inner liner can slow down the damage of rivers impact protection die sleeve to the blade, prolongs the life of blade, also reduces the wearing and tearing to the blade when the installation is dismantled to the protection die sleeve.

Drawings

Fig. 1 is a schematic view of the overall structure of the device of the present invention.

Fig. 2 is a schematic diagram of the protective assembly sleeving structure of the present invention.

Fig. 3 is a schematic diagram of the three-layer structure of the protective die sleeve of the present invention.

Fig. 4 is a schematic view of the protective die sleeve structure of the present invention.

In the figure: 1. semi-open impeller, 2, impeller body, 21, back shroud, 22, blade, 3, protection subassembly, 31, laminating board, 32, protection die sleeve, 33, convex column, 34, arc surface, 35, smooth ceramic layer, 36, basic unit, 37, rubber inner liner.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, a centrifugal pump impeller with good cavitation erosion resistance comprises a semi-open impeller 1, the semi-open impeller 1 is composed of an impeller body 2 and a protection component 3, the impeller body 2 includes blades 22 and a back cover plate 21, the protection component 3 includes an attachment plate 31 and a protection die sleeve 32 protruding outward from the attachment plate 31, the protection die sleeve 32 is provided with a hollow bottom opening, the protection die sleeve 32 is matched with the blades 22 in size and sleeved on the outer wall of the blades 22, the attachment plate 31 is fixed on the upper surface of the back cover plate 21 through screws, a convex column 33 is provided in the middle of the attachment plate 31, the top end of the convex column 33 is provided with an arc surface 34, when the semi-open impeller 1 rotates, liquid does not form vortex and gathers at the center of the semi-open impeller 1, pressure at the center of the semi-open impeller 1 is reduced, the blades 22 are protected by sleeving the die sleeve 32 on the blades 22, protection die sleeve 32 and blade 22's distribution and structure phase-match, from top to bottom the suit on blade 22 surface, like this blade 22 is when rotatory centrifugal transport liquid, through the indirect contact liquid of protection die sleeve 32, even take place the cavitation phenomenon in the liquid like this, also loss protection die sleeve 32 earlier, even the impaired unable use of protection die sleeve 32, inside still has blade 22 to play the guard action, the centrifugal pump damage can not appear, and protection component 3 passes through the screw and installs on impeller body 2, convenient to detach changes.

The vane 22 and the back cover plate 21 are integrated, the vane body 2 composed of the vane 22 and the back cover plate 21 is more sturdy and durable, the attaching plate 31 and the protective die sleeve 32 are integrated, the protective component 3 composed of the attaching plate 31 and the protective die sleeve 32 is more sturdy and durable, the protective component 3 can be conveniently and integrally taken down for replacement during replacement, compared with replacement of the vane body 2, the protective die sleeve 32 is more economical and convenient to be a three-layer structure, the middle layer is a base layer 36, the upper layer and the lower layer of the base layer 36 are respectively a smooth ceramic layer 35 and a rubber lining layer 37, the rubber lining layer 37 is close to the vane 22, the smooth ceramic layer 35 enables the surface of the protective die sleeve 32 to be smoother, bubbles inside a pump head during operation of the centrifugal pump are reduced, so that cavitation is reduced, the rubber lining layer 37 is in contact with the vane 22, abrasion of the protective die sleeve 32 to the surface of, the impact force can also be offset partly by rubber liner 37, avoids blade 22 also to receive the damage, has improved blade 22's life greatly, and the one end that protection die sleeve 32 is close to rigging plate 31 narrows down towards the width on top in proper order, and the liquid bubble that can avoid the centrifugation to produce erodees the surface of protection die sleeve 32 perpendicularly, and the inclined plane can guide the bubble to slide from protection die sleeve 32 surface fast.

The utility model discloses a theory of operation: through suit protective assembly 3 on impeller body 2, protective die sleeve 32 on the protective assembly 3 aligns blade 22, from top to bottom the cover is outside at blade 22, the binding plate 31 pastes the upper surface at back shroud 21, through the screw fixation, constitute semi-open impeller 1, semi-open impeller 1 during operation, protective die sleeve 32 protects blade 22, after long-time use, if protective die sleeve 32 is damaged by cavitation erosion, through dismantling the screw, take off protective assembly 3 change a new protective assembly 3 can, but impeller body 2 repeatedly usable.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a centrifugal pump impeller that cavitation erosion resistance is good, includes semi-open impeller (1), its characterized in that: semi-open impeller (1) comprises impeller body (2) and protection component (3), impeller body (2) include blade (22) and back shroud (21), protection component (3) including rigging board (31) with outwards convex protection die sleeve (32) on rigging board (31), the inside cavity bottom opening of protection die sleeve (32) sets up, protection die sleeve (32) with the size phase-match of blade (22) and cup joint the outer wall of blade (22), rigging board (31) are through the screw fixation the upper surface of back shroud (21), the middle part of rigging board (31) sets up convex post (33), the top of convex post (33) sets up arc surface (34).

2. The impeller for a centrifugal pump having good cavitation erosion resistance according to claim 1, wherein: the blades (22) and the rear cover plate (21) are of an integral structure.

3. The impeller for a centrifugal pump having good cavitation erosion resistance according to claim 1, wherein: the attaching plate (31) and the protective die sleeve (32) are of an integral structure.

4. The impeller for a centrifugal pump having good cavitation erosion resistance according to claim 1, wherein: the protective die sleeve (32) is of a three-layer structure, the middle layer is a base layer (36), and the upper layer and the lower layer of the base layer (36) are respectively a smooth ceramic layer (35) and a rubber lining layer (37).

5. The impeller for a centrifugal pump having good cavitation erosion resistance according to claim 4, wherein: the rubber lining layer (37) is close to the blade (22).

6. The impeller for a centrifugal pump having good cavitation erosion resistance according to claim 1, wherein: the width of one end of the protective die sleeve (32) close to the attaching plate (31) is gradually narrowed towards the top end.