阅读说明：本技术 一种工作面可拆的耐磨损半开式固液两相流泵叶轮 (Wear-resistant semi-open type solid-liquid two-phase flow pump impeller with detachable working surface ) 是由 李伟 吴普 施卫东 周岭 朱勇 曹卫东 季磊磊 于 2019-10-24 设计创作，主要内容包括：本发明公开了一种工作面可拆的耐磨损半开式固液两相流泵叶轮,包括叶轮后盖板,所述叶轮后盖板上沿圆周方向均匀设置有若干片基础叶片,每片基础叶片上装配有叶片工作面衬板,所述叶片工作面衬板呈“C”型,且能够与基础叶片的工作面、进口端面和出口端面相贴合,且所述叶片工作面衬板与基础叶片之间采用可拆卸连接；本发明叶轮的叶片工作面衬板及进口边可拆卸,避免了频繁更换叶轮,减少了叶轮维护成本。(The invention discloses a wear-resistant semi-open type solid-liquid two-phase flow pump impeller with a detachable working surface, which comprises an impeller rear cover plate, wherein a plurality of basic blades are uniformly arranged on the impeller rear cover plate along the circumferential direction, a blade working surface lining plate is assembled on each basic blade, the blade working surface lining plate is C-shaped and can be attached to the working surface, the inlet end surface and the outlet end surface of each basic blade, and the blade working surface lining plate is detachably connected with the basic blades; the lining plate and the inlet edge of the working surface of the blade of the impeller are detachable, so that the frequent replacement of the impeller is avoided, and the maintenance cost of the impeller is reduced.)

1. The utility model provides a removable stand wear and tear semi-open solid-liquid two-phase flow pump impeller of working face, a serial communication port, including impeller back shroud (1), evenly be provided with a plurality of basic blades (3) along the circumferencial direction on impeller back shroud (1), be equipped with blade working face welt (2) on every piece basic blade (3), blade working face welt (2) are "C" type, and blade working face welt (2) can laminate mutually with working face, inlet end face and the outlet end face of basic blade (3), just adopt between blade working face welt (2) and the basic blade (3) to dismantle and be connected.

2. The abrasion-resistant semi-open type solid-liquid two-phase flow pump impeller with the detachable working surface as claimed in claim 1, wherein the inlet end surface and the outlet end surface of the blade working surface lining plate (2) are detachably connected with the inlet end surface and the outlet end surface of the base blade (3) respectively through screws.

3. The abrasion-resistant semi-open type solid-liquid two-phase flow pump impeller with the detachable working surface is characterized in that a through hole (6) vertical to a rear cover plate (1) of the impeller is formed in the inlet end of a lining plate (2) of the working surface of the impeller, a cylindrical pin (4) is fixedly arranged in front of the inlet end of a base blade (3), and the cylindrical pin (4) is matched with the through hole (6) to realize pin joint of the inlet end of the lining plate (2) of the working surface of the impeller and the inlet end of the base blade (3); the outlet end face of the blade working face lining plate (2) is detachably connected with the outlet end face of the base blade (3) through screws.

4. The detachable-working-surface abrasion-resistant semi-open solid-liquid two-phase pump impeller according to claim 1, 2 or 3, characterized in that the base blade (3) is a cylindrical blade or a spatially twisted blade.

5. The impeller of the abrasion-resistant semi-open type solid-liquid two-phase flow pump with the detachable working surface as claimed in claim 4, wherein the number of the base blades (3) is 4-8, and the base blades are uniformly distributed on the rear cover plate (1) of the impeller.

6. The impeller of the abrasion-resistant semi-open type solid-liquid two-phase flow pump with the detachable working surface as claimed in claim 5, wherein the vane working surface lining plate (2) is integrally manufactured by adopting a high-hardness abrasion-resistant material.

7. The abrasion-resistant semi-open type solid-liquid two-phase flow pump impeller with the detachable working surface as claimed in claim 6, wherein a slope convex surface (10) is processed on the working surface at the inlet end of the blade working surface lining plate (2).

8. The detachable-working-surface wear-resistant semi-open type solid-liquid two-phase flow pump impeller as claimed in claim 7, wherein an included angle α between the tangent of the outer surface of the slope convex surface (10) and the tangent of the outer surface of the vane working surface lining plate (2) is 5-10 degrees, and the length of the slope convex surface (10) is one fifth of the length of the working surface of the vane working surface lining plate (2).

Technical Field

The invention belongs to the technical field of fluid machinery, and particularly relates to a wear-resistant semi-open type solid-liquid two-phase flow pump impeller with a detachable working surface.

Background

The solid-liquid two-phase fluid widely exists in nature and in a plurality of industrial productions, under the condition of conveying a two-phase medium containing silt particles, the abrasion of a main hydraulic component can cause the serious reduction of the performance of a pump, an impeller is used as a core component of a centrifugal pump to continuously provide energy for a flowing medium, the impeller is seriously abraded by long-time particle washing, the performance of the pump is further sharply reduced, and the problem of how to solve the abrasion of a pump overflowing component, particularly the impeller, is always a bottleneck of the industry. With the gradual popularization of the application of the solid-liquid two-phase flow centrifugal pump, the problem of abrasion becomes more and more prominent. A large number of experiments and engineering practices show that when two-phase fluid containing larger particle diameters is conveyed, especially when a pump impeller runs at a high rotating speed, the working surfaces of the blades and the inlet and outlet edges of the blades are seriously abraded. The existing design method of the solid-liquid two-phase flow pump cannot meet increasingly complex working conditions, particle abrasion is not solved well, abrasion is delayed mainly by improving the performance of pump materials, once abrasion is worsened, the whole impeller can only be scrapped and cannot be maintained, and the impeller is replaced by a new impeller, so that the production cost is increased.

Through retrieval, the related patents: CN204113726U fixes and detaches the blade through the slide block, the clamping groove and the clamping device, the blade is required to have a certain thickness to be provided with the clamping groove, the applicability is low, and the processing and detaching processes of the clamping groove are complex; CN107664139A fixes and dismantles the blade through slot spring fastening structure, but is difficult to be suitable for the complicated appearance of cylinder blade and space distortion blade, and the structure of spring and cylinder fore-set is difficult to be used for dismantling the blade; CN209324432U fixes and removes the blade through the sliding and threaded connection of the limited block, thread bush and wheel disc; the invention relates to a detachable blade, which mainly aims to facilitate the disassembly and assembly convenience of the blade, excessively depends on a spring and a clamping groove for fixing and disassembling, is easy to block and block by particles when a medium containing particles is conveyed, so that the structure is invalid, the abrasion characteristic of the blade is less considered, a method for directly disassembling the whole blade is mainly adopted, and the material cost for replacing the whole blade is still relatively high.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a wear-resistant semi-open type solid-liquid two-phase flow pump impeller with a detachable working surface, and the wear of blades is reduced by adding a slope convex surface on the working surface to drive particles to rotate so as to enable the particles to move away from the working surface; in addition, the liner plate and the inlet edge of the working surface of the blade can be detached, so that the frequent replacement of the impeller is avoided, and the maintenance cost of the impeller is reduced.

The technical scheme adopted by the invention is as follows:

the utility model provides a removable stand wear and tear semi-open solid-liquid two-phase flow pump impeller of working face, includes the impeller back shroud, evenly be provided with a plurality of basic blades along the circumferencial direction on the impeller back shroud, be equipped with the blade working face welt on every piece of basic blade, the blade working face welt is "C" type, and can laminate mutually with the working face of basic blade, import terminal surface and outlet end face, just adopt between blade working face welt and the basic blade to dismantle and be connected.

Furthermore, the inlet end face and the outlet end face of the blade working face lining plate are detachably connected with the inlet end face and the outlet end face of the basic blade through screws respectively;

furthermore, a through hole vertical to the rear cover plate of the impeller is arranged at the inlet end of the blade working surface lining plate, a cylindrical pin is fixedly arranged at the front part of the inlet end of the basic blade, and the cylindrical pin is matched with the through hole to realize pin joint of the inlet end of the blade working surface lining plate and the inlet end of the basic blade; the outlet end face of the liner plate of the blade working face is detachably connected with the outlet end face of the base blade through a screw;

further, the base blade is a cylindrical blade or a space twisted blade;

furthermore, 4-8 base blades are uniformly distributed on the rear cover plate of the impeller;

further, the lining plate of the working surface of the blade is integrally made of high-hardness wear-resistant materials;

further, a slope convex surface is processed on the working surface of the inlet end of the lining plate of the working surface of the blade;

further, an included angle α between the tangent line of the outer surface of the slope convex surface and the tangent line of the outer surface of the blade working surface lining plate is 5-10 degrees, and preferably 8 degrees.

The invention has the beneficial effects that:

1. the working surface of the inlet end of the lining plate of the working surface of the blade is provided with a slope convex surface with a certain angle, a fluid medium flows through the slope drawing surface to generate a starting vortex, the vortex drives particles to rotate, the direction is opposite to the rotating direction of the impeller, and the Magnus effect is generated. Under the effect, the particles move towards the direction deviating from the working surface, so that the impact frequency to the lining plate of the working surface of the blade is reduced, and the abrasion of the blade is reduced.

2. The lining plate of the working surface of the blade is integrally made of high-hardness wear-resistant materials, so that the wear resistance of the impeller is improved, and the working surface and the inlet and the outlet which are seriously worn can be conveniently replaced due to the detachable lining plate. Although wear-resistant materials are used, the detachable working face is designed to be small in thickness, so that the material cost is saved, and compared with the method of replacing the whole impeller or manufacturing the whole impeller by adopting the wear-resistant materials, the method is low in processing and manufacturing cost.

3. The detachable part and the original impeller are simple in connection and fixing mode, and the parts with serious abrasion can be replaced without detaching the impeller from the pump shaft, so that the detachment and the installation are greatly facilitated, and the maintenance time is saved.

Drawings

FIG. 1 is a general assembly drawing of a wear-resistant semi-open type solid-liquid two-phase flow pump impeller with a detachable working surface;

FIG. 2 is a three-dimensional schematic view of an impeller back shroud and its base blades;

FIG. 3 is a three-dimensional schematic view of a removable bucket face liner;

FIG. 4 is a schematic view of the detachable vane face liner plate coupled to the impeller back shroud cylindrical pin;

FIG. 5 is a schematic view of the threaded coupling of the removable vane face liner to the base vane;

in the figure, the impeller comprises an impeller rear cover plate 1, a blade working surface lining plate 2, a base blade 3, a cylindrical pin 4, a screw 5, a through hole 6, a through hole 7, a thread 8, a threaded hole 9, an inlet edge 10, a slope convex surface 11, an outlet edge 12 and a through hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in figure 1, the invention designs a wear-resistant semi-open type solid-liquid two-phase flow pump impeller with a detachable working surface, which comprises an impeller rear cover plate 1, wherein 6 pieces of basic blades 3 are uniformly arranged on the impeller rear cover plate 1 along the circumferential direction, each piece of basic blade 3 is provided with a detachable blade working surface lining plate 2, the blade working surface lining plate 2 is integrally made of high-hardness wear-resistant materials such as high manganese steel, tungsten carbide and the like, the structure of the blade working surface lining plate 2 is shown in figure 3, the blade working surface lining plate 2 is in a C shape and can be attached to the working surface, the inlet end surface and the outlet end surface of the basic blade 3, in order to generate a certain vortex and induce the Magnus effect, a slope convex surface 10 is processed on the working surface at the inlet end of the blade working surface lining plate 2, the included angle α between the outer surface tangent line of the slope convex surface 10 and the outer surface tangent line of the blade working surface lining plate 2 is 8 degrees, and the length of the slope convex surface 10 is one fifth of the working surface length of the.

In order to realize the detachability between the blade working surface lining plate 2 and the base blade 3, the invention provides two designs, which specifically comprise the following steps: