CN219317248U

CN219317248U - Ultra-narrow runner impeller

Info

Publication number: CN219317248U
Application number: CN202320607335.4U
Authority: CN
Inventors: 张荔; 王振伟; 王超; 曾庆琦; 徐剑; 代超
Original assignee: Dalian Leo Huaneng Pump Co ltd
Current assignee: Dalian Leo Huaneng Pump Co ltd
Priority date: 2023-03-24
Filing date: 2023-03-24
Publication date: 2023-07-07
Anticipated expiration: 2033-03-24

Abstract

The utility model relates to an ultra-narrow flow passage impeller, in particular to an ultra-narrow flow passage impeller for a centrifugal pump. The utility model comprises the following steps: an impeller front cover plate and an impeller rear cover plate which are cast in a split manner in an investment casting mode; the inner side of the impeller rear cover plate is cast with a raised blade; the edge of the impeller rear cover plate is cast with an inward spigot; the front cover plate of the impeller is cast with a through welded junction groove with the same shape as the blade; the blades of the impeller rear cover plate are aligned with the through welded junction grooves of the impeller front cover plate, and the rabbets of the impeller front cover plate are matched with the edges of the impeller rear cover plate, so that the impeller front cover plate and the impeller rear cover plate are assembled and welded into a whole. The radian of the through weld notch is consistent with that of the blade, the through weld notch is a welding groove, and the opening angle is 20-30 degrees; the groove width at the bottom of the groove is the same as the thickness of the blade. The technical scheme of the utility model solves the problems of high manufacturing and processing difficulty and high rejection rate of the casting process caused by extremely narrow impeller flow passage and large diameter of the small-flow high-lift centrifugal pump in the prior art.

Description

Ultra-narrow runner impeller

Technical Field

The utility model discloses an ultra-narrow flow passage impeller, relates to the technical field of centrifugal pump processing, and particularly relates to an ultra-narrow flow passage impeller for a centrifugal pump.

Background

Pumps for small-flow high-lift working conditions exist in petrochemical industry, electric power industry and other industries, such as partial small-flow lean liquid pumps and water injection pumps in oil refining devices in petrochemical industry; a carbon three hydrogenation feed pump and a wash oil injection pump in the ethylene device; a methyl ammonium pump in a urea device in the coal chemical industry; critical boiler water supplementing pumps in the power industry, and the like. The pump for the industrial device adopts the following three structural forms in China: a medium speed multistage centrifugal pump, a high speed partial flow pump or a reciprocating plunger pump. The pumps with three structures have advantages and disadvantages, wherein the purchase price of the medium-speed multistage centrifugal pump is relatively low, the later maintenance is simple and convenient, the pressure on the performance is continuous and has no pulsation, the suction performance is good, and cavitation is not easy to occur; at the same time, however, the impeller of the centrifugal pump with small flow and high lift is difficult to manufacture, especially for the flow smaller than 20m ³ The centrifugal pump impeller with specific rotation speed less than 40 has very narrow flow passage, large diameter and rated flow rate of 6.5m ³ The working condition of the multistage centrifugal pump with the single-stage lift of 37 meters is exemplified by that the design width of the impeller flow channel outlet is not more than 2mm, the impeller diameter is about 200mm, and the difficulty for manufacturing the impeller by the traditional casting process is extremely high and the rejection rate is extremely high.

Aiming at the problems in the prior art, the research and design of a novel ultra-narrow runner impeller is necessary to overcome the problems in the prior art.

Disclosure of Invention

According to the technical problems of high manufacturing and processing difficulty and high rejection rate of a casting process caused by extremely narrow runner and large diameter of the impeller of the low-flow high-lift centrifugal pump, the ultra-narrow runner impeller is provided. According to the utility model, the impeller rear cover plate and the impeller front cover plate which are respectively provided with the blades with the same radian and the through weld notch groove are cast in a split manner mainly through an investment casting mode, so that the casting difficulty is reduced, and the further processing and treatment of the surfaces of the channels and the blades are facilitated; and the front and the cover plates of the impeller are combined in a welding mode after rough machining, and then machined to be finished products. The utility model solves the problem of difficult casting of the impeller of the small-flow centrifugal pump, integrally reduces the manufacturing difficulty, reduces the rejection rate and improves the labor production efficiency.

The utility model adopts the following technical means:

an ultra-narrow flow path impeller comprising: an impeller front cover plate and an impeller rear cover plate which are cast in a split manner in an investment casting mode;

further, the inner side of the impeller rear cover plate is cast with raised blades; the edge of the impeller rear cover plate is cast with an inward spigot;

further, a through welded junction groove with the same shape as the blade is cast on the front cover plate of the impeller;

further, the blades of the impeller back cover plate are aligned with the through welded junction grooves of the impeller front cover plate, and the rabbets of the impeller front cover plate are matched with the edges of the impeller back cover plate, so that the impeller front cover plate and the impeller back cover plate are assembled and welded into a whole.

Further, the through weld notch is consistent with the arc of the blade.

Further, the through weld notch is used as a welding groove, the section of the groove is trapezoid, and the opening angle of the trapezoid is 20-30 degrees;

further, the groove width at the bottom of the groove is the same as the thickness of the blade.

Further, the processing of blade department can also process the boss with penetrating weld neck recess corresponding dimension, assembles the boss in penetrating weld neck recess when the dress is closed, auxiliary positioning and reduce the welding thickness.

Compared with the prior art, the utility model has the following advantages:

1. according to the ultra-narrow runner impeller provided by the utility model, the front impeller cover plate and the rear impeller cover plate are respectively cast in a split manner in an investment casting manner, so that the casting difficulty is reduced;

2. the ultra-narrow runner impeller provided by the utility model has the advantages that the front impeller cover plate and the rear impeller cover plate are cast in a split mode, so that the further processing and treatment of the runner surface and the blades are facilitated;

3. the ultra-narrow runner impeller provided by the utility model solves the problem that the impeller of the small-flow centrifugal pump is difficult to cast, integrally reduces the manufacturing difficulty, reduces the rejection rate and improves the labor production efficiency.

In conclusion, the technical scheme of the utility model solves the problems of high manufacturing and processing difficulty and high rejection rate of the casting process caused by extremely narrow impeller flow passage and large diameter of the low-flow high-lift centrifugal pump in the prior art.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is a schematic view of the front cover plate of the impeller of the present utility model;

FIG. 4 is a cross-sectional view of the front shroud of the impeller of the present utility model;

FIG. 5 is a view A-A of FIG. 3 in accordance with the present utility model;

FIG. 6 is a schematic view of the back cover plate structure of the impeller of the present utility model;

FIG. 7 is a cross-sectional view of the back shroud of the impeller of the present utility model;

FIG. 8 is a schematic diagram of a welding process according to the present utility model;

FIG. 9 is a view B-B of FIG. 8 in accordance with the present utility model;

FIG. 10 is a schematic view of an impeller weld of the present utility model.

In the figure:

1. the front cover plate 11 of the impeller and the through welded notch;

2. impeller back cover plate 21, blade 211, boss 22, spigot;

3. tool 31, clamp plate A32, clamp plate B33, cushion 34, mould bottom plate.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

As shown in figures 1 and 2, the utility model provides an ultra-narrow runner impeller which is formed by welding two parts in a grouping way, and comprises an impeller rear cover plate 2 with combined blades 21 and an impeller front cover plate 1 with through welded junction grooves 11 consistent with the radian of the blades 21.

As shown in figures 3-7, the impeller front cover plate 1 and the impeller rear cover plate 2 are respectively cast in a split mode through an investment casting mode, so that casting difficulty is reduced.

The impeller front cover plate 1 in the figures 3 and 4 is cast with a through welded junction groove 11 consistent with the radian of the blade 21 as a welding groove, the welding quantity is reduced as much as possible on the premise of ensuring the welding strength and the quality according to the thickness of the blade 21 and the cover plate, the groove angle is selected to be 20-30 degrees, and the bottom groove width is equal to the thickness of the blade 21. The outer circle of the impeller front cover plate 1 is processed into the size of a spigot 22 matched with the outer circle of the impeller rear cover plate 2 before welding, and after the impeller front cover plate and the impeller rear cover plate are assembled, the lap joint of the outer circle is spot-welded to be shown in the attached figure 1, so that the positioning is convenient, and the buckling deformation of the welding of the front cover plate and the rear cover plate can be reduced through spot welding.

The impeller rear cover plate 2 of fig. 5-7 refers to the circumscribed circle diameter of the through weld notch 11 of the impeller front cover plate 1, a boss 211 with a corresponding size is processed at the position of the blade 21, and the boss 211 is assembled into the through weld notch 11 of the impeller front cover plate 1 during assembling, so that the positioning is assisted and the thickness of the welded meat is reduced, as shown in fig. 1. When special treatment requirements are placed on the flow-through surface, or when adjustment of the length of each blade 21 is required, the blade can be trimmed before assembly and welding.

As shown in figures 8-9, after the front cover plate and the rear cover plate of the impeller are assembled, the front cover plate and the rear cover plate are positioned and pressed by a tool 3; the front and rear cover plates of the assembled impeller are placed on a bottom plate 34 of the mould, the middle parts of the front and rear cover plates of the impeller pass through a bolt and a pressing plate A31 to be positioned and pressed, and then the edges of the front and rear cover plates of the impeller are pressed by a pressing plate B32 and the bolt; finally, according to the figure 10, the assembly welding is carried out in a sectional and symmetrical way, the welding seam is positioned in the groove of the front cover plate of the impeller, and the groove is filled up. And carrying out post-welding heat treatment and machining to obtain the impeller finished product.

According to the structural scheme, the casting difficulty and the processing rejection rate are reduced, the efficiency is improved as a whole, and the production period is shortened.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. An ultra-narrow runner impeller, characterized in that:

the ultra-narrow runner impeller comprises: an impeller front cover plate (1) and an impeller rear cover plate (2) which are cast in a split manner through an investment casting mode;

the inner side of the impeller rear cover plate (2) is cast with a raised blade (21); the edge of the impeller rear cover plate (2) is cast with an inward spigot (22);

the front cover plate (1) of the impeller is cast with a through weld notch (11) with the same shape as the blade (21);

the blades (21) of the impeller rear cover plate (2) are aligned with the through welded junction grooves (11) of the impeller front cover plate (1), and the rabbets (22) of the impeller front cover plate (1) are matched with the edges of the impeller rear cover plate (2), so that the impeller front cover plate (1) and the impeller rear cover plate are assembled and welded into a whole.

2. The ultra-narrow runner impeller of claim 1, wherein:

the radian of the through weld notch (11) is consistent with that of the blade (21).

3. The ultra-narrow runner impeller of claim 2, wherein:

the through weld notch groove (11) is used as a welding groove, the section of the groove is trapezoid, and the opening angle of the trapezoid is 20-30 degrees;

the groove width of the bottom of the groove is the same as the thickness of the blade (21).

4. An ultra-narrow runner impeller according to claim 3, wherein:

the blade (21) can be processed to form a boss (211) with a size corresponding to that of the through weld notch (11), and the boss (211) is assembled in the Jin Tongtou weld notch (11) during assembling to assist in positioning and reducing the thickness of meat.