CN101793264A

CN101793264A - Method for manufacturing impeller of desulphurization circulating pump

Info

Publication number: CN101793264A
Application number: CN 201010157913
Authority: CN
Inventors: 卢艺雄; 陈福林
Original assignee: ZIGONG HONGQI PUMP SEAL MANUFACTURE CO Ltd
Current assignee: ZIGONG HONGQI PUMP SEAL MANUFACTURE CO Ltd
Priority date: 2010-04-28
Filing date: 2010-04-28
Publication date: 2010-08-04

Abstract

The invention discloses a method for manufacturing an impeller of a desulphurization circulating pump, which comprises the steps of: 1) blank preparation, namely, preparing blanks of a front cover plate, vanes, a front end plate, a rear end plate, a closing plate, a connecting cylinder, a seal receptacle and a mounting housing, wherein all the blanks adopt stainless steel; 2) the machining of each part; 3) scribing; 4) assembly welding, namely, forming a semi-finished product of the impeller; 5) the generation of vibration effect, namely, mechanically vibrating the semi-finished product to eliminate stress; 6) the half-finished turning of the mounting shaft housing; 7) balance correction, namely, realizing the dynamic and static balance of the impeller; 8) the generation of secondary vibration effect; 9) finished turning; and 10) spay welding, namely, spray-welding hard alloy layers on the surfaces of a front cover and the vanes, the outer surfaces of the front end plate, the closing plate, the seal receptacle and the rear end plate and the two end faces of the connecting cylinder. The method has the advantages of convenient machining and relatively lower cost; and the obtained product has the advantages of high corrosion resistance and wearing resistance, light weight, high strength, long service life and good maintainability.

Description

The manufacture method of impeller of desulphurization circulating pump

Technical field

The present invention relates to a kind of manufacture method of impeller of desulphurization circulating pump.

Background technique

Along with the attention of countries in the world to environmental protection, serial mandatory environmental regulation and policy have been put into effect in succession, progressively implementing of flue-gas desulfurizing engineering (FGD) is one of effective measures of SO2 discharging in the control factory smoke, desulfuration recycle pump is one of key equipment of power station flue-gas desulfurizing engineering, impeller is the core component of pump, it need possess corrosion resistant, wear-resisting characteristic, and is determining working life, Economy, the maintainability of pump; Be widely used in the impeller of desulfuration recycle pump at present, its processing mode mainly contains two kinds: a kind of is to form with carbofrax material is integral sintered, good corrosion resistance, but main deficiency has: the mechanical processing characteristic extreme difference, can't adopt common metal cutting processing, need the specialized mould manufacturing, the die cost costliness; Material fragility is big, shock resistance, tensile strength are poor, easy to crack, and working life is shorter, as defectiveness, can't keep in repair use, has only refitting new; Another kind is to cast with high-chromium abrasion-proof cast iron to form, and its corrosion resistant, wear resistance are better, and main deficiency has: require casting technique level height, pore, slag inclusion etc. are often arranged, as defectiveness, can't keep in repair use; Hardness is higher, the mechanical processing characteristic extreme difference, and the common metal cutting is difficult to carry out, and the impeller physical dimension is difficult to guarantee; Material fragility is bigger, and shock resistance, tensile strength are poor; And integral body is solid construction, and impeller is heavier, has increased moment of torsion, and the strength and stiffness of axle are reduced, and bearing load strengthens, and the equipment that influences normally moves.

Summary of the invention

The objective of the invention is to above-mentioned deficiency at prior art, a kind of manufacture method of impeller of desulphurization circulating pump is provided, it has is convenient to processing, lower-cost advantage, the product of acquisition have corrosion resistant preferably, wear resistance, in light weight, intensity is high, long service life, maintainable good advantage.

For achieving the above object, the manufacture method of impeller of desulphurization circulating pump of the present invention, it is characterized in that may further comprise the steps: 1) blanking: get the blank of front shroud, blade, front end-plate, end plate, shrouding, connecting cylinder, sealing seat, installation axle sleeve down, above blank all adopts stainless steel; 2) process each part: front shroud is by roll bending, welding fabrication; Blade pass is crossed die-forging forming twice; End plate is by crooked, welding fabrication; Shrouding, connecting cylinder, sealing seat are by the cutting moulding; 3) line: for preparing each part assembling location; 4) assembly welding:, form the semi-finished product of impeller with each part assembling, welding; 5) jarring effect: semi-finished product are carried out mechanical vibration, eliminate stress; 6) the installation shaft cover is carried out half finish turning; 7) smoothing weighing apparatus:, realize the dynamic and static balance of impeller by the repair welding balancing weight; 8) jarring effect once more: secondary vibration eliminates stress; 9) finish turning; 10) surfacing: in the outer surface of surface, front end-plate, shrouding, sealing seat and the end plate of protecgulum and blade and the both ends of the surface of connecting cylinder, these with flow-passing surface that medium contacts on equal surfacing hard alloy layers.

As a further improvement on the present invention, when assembly welding, also be welded with gusset that connects front end-plate, end plate, shrouding, connecting cylinder and the gusset that connects front end-plate, connecting cylinder, sealing seat, installation axle sleeve; Can improve the intensity of impeller;

The present invention adopts each stainless steel parts assembly welding, the surface spraying weld hard alloy layer processes impeller, its technological level is less demanding, die cost is lower, have and be convenient to processing, lower-cost advantage, products obtained therefrom not only has corrosion resistant preferably, wear resistance, and by front end-plate, end plate, shrouding, the bonnet inside that connecting cylinder is formed, and be hollow-core construction between bonnet and the installation axle sleeve, have in light weight, the advantage that intensity is high, and has a favorable mechanical processibility, no matter be in manufacture process, also be to use and re-use after all can keeping in repair after the wearing and tearing, it is good maintainable good to have, add by twice jarring effect and eliminate stress long service life;

In sum, the present invention has is convenient to processing, lower-cost advantage, the product of acquisition have corrosion resistant preferably, wear resistance, in light weight, intensity is high, long service life, maintainable good advantage.

Description of drawings

Fig. 1 is the plan view by the impeller of the present invention's acquisition.

Fig. 2 is the left view of Fig. 1.

Fig. 3 is the E-E sectional drawing of Fig. 1.

Embodiment

The present invention is further detailed explanation below in conjunction with accompanying drawing.

The manufacture method of this impeller of desulphurization circulating pump may further comprise the steps: 1) blanking: get the blank of front shroud, blade, front end-plate, end plate, shrouding, connecting cylinder, sealing seat, gusset, installation axle sleeve down, above blank all adopts stainless steel; 2) process each part: front shroud is by roll bending, welding fabrication; Blade pass is crossed die-forging forming twice; End plate is by crooked, welding fabrication; Shrouding, connecting cylinder, sealing seat are by the cutting moulding; 3) line: for preparing each part assembling location; 4) assembly welding: as Fig. 1, Fig. 2 and shown in Figure 3, with front end-plate 3a, end plate 3b, connecting cylinder 3c, the shrouding 3d of protecgulum 1, six blades 2, ring-type, axle sleeve 4, ring sealing base 5, five stiffening ribs 7, eight stiffening rib 8 assemblings, welding are installed, stiffening rib 7 connects front end-plate 3a, end plate 3b, shrouding 3d, connecting cylinder 3c, stiffening rib 8 connects front end-plate 3a, connecting cylinder 3c, sealing seat 5, axle sleeve 4 is installed, and forms the semi-finished product of impeller; 5) jarring effect: semi-finished product are loaded onto shaking machine carry out mechanical vibration, for stainless steel material, jarring effect has the effect that eliminates stress preferably; 6) the installation shaft cover is carried out half finish turning; 7) smoothing weighing apparatus:, realize the dynamic and static balance of impeller by the repair welding balancing weight; 8) jarring effect once more: secondary vibration eliminates stress; 9) the installation shaft cover is carried out finish turning; 10) surfacing: in the outer surface of surface, front end-plate 3a, shrouding 3d, sealing seat 5 and the end plate 3b of protecgulum 1 and blade 2 and the both ends of the surface of connecting cylinder 3c, these with flow-passing surface that medium contacts on equal surfacing hard alloy layers 9.

Technological level of the present invention is less demanding, die cost is lower, have and be convenient to processing, lower-cost advantage, products obtained therefrom not only has preferably corrosion resistant, wearability, and by front end-plate 3a, end plate 3b, shrouding 3d, the bonnet inside that connecting cylinder 3c forms, and be hollow-core construction between bonnet and the installation axle sleeve 4, have in light weight, the advantage that intensity is high, and has a good machining property, no matter be in manufacture process, or re-use after all can keeping in repair after the use wearing and tearing, it is good maintainable good to have, add by twice dither effect and eliminate stress long service life.

Claims

1. the manufacture method of an impeller of desulphurization circulating pump is characterized in that may further comprise the steps: 1) blanking: get the blank of front shroud, blade, front end-plate, end plate, shrouding, connecting cylinder, sealing seat, installation axle sleeve down, above blank all adopts stainless steel; 2) process each part: front shroud is by roll bending, welding fabrication; Blade pass is crossed die-forging forming twice; End plate is by crooked, welding fabrication; Shrouding, connecting cylinder, sealing seat are by the cutting moulding; 3) line: for preparing each part assembling location; 4) assembly welding:, form the semi-finished product of impeller with each part assembling, welding; 5) jarring effect: semi-finished product are carried out mechanical vibration, eliminate stress; 6) the installation shaft cover is carried out half finish turning; 7) smoothing weighing apparatus:, realize the dynamic and static balance of impeller by the repair welding balancing weight; 8) jarring effect once more: secondary vibration eliminates stress; 9) finish turning; 10) surfacing: in the outer surface of surface, front end-plate, shrouding, sealing seat and the end plate of protecgulum and blade and the both ends of the surface of connecting cylinder, these with flow-passing surface that medium contacts on equal surfacing hard alloy layers.

2. the manufacture method of impeller of desulphurization circulating pump as claimed in claim 1 is characterized in that also being welded with gusset that connects front end-plate, end plate, shrouding, connecting cylinder and the gusset that connects front end-plate, connecting cylinder, sealing seat, installation axle sleeve when assembly welding.