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Forward skewed multi-blade impeller with narrow cavity and integral casting technique thereof

An integral casting, multi-wing technology, used in non-variable volume pumps, liquid fuel engines, components of pumping devices for elastic fluids, etc., can solve the problem that the noise index cannot meet the needs of fan development, noise control The problem of limited means is to achieve the effect of simple control means, light weight and high casting precision for air noise and vibration acceleration level.

Active Publication Date: 2010-07-28
CHINA SHIP DEV & DESIGN CENT +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the limitations of its structural form and processing technology, most of this type of fan used riveted combined impellers in the past, and its noise control methods were limited, and the noise index could no longer meet the needs of fan development.

Method used

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  • Forward skewed multi-blade impeller with narrow cavity and integral casting technique thereof
  • Forward skewed multi-blade impeller with narrow cavity and integral casting technique thereof
  • Forward skewed multi-blade impeller with narrow cavity and integral casting technique thereof

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with drawings and embodiments.

[0027] The structure of forward multi-blade narrow cavity impeller of the present invention is as figure 1 , 2 As shown, it includes a base plate 4 and a hollow front plate 2. The outer diameter D of the base plate is 235mm, and a narrow blade 1 is arranged circumferentially between the base plate and the front plate. The blades are arc-shaped, and the radian θ 2Л / 3, the radius of curvature R is 15mm, the blade radial length L is 28mm, the outlet height H of the blade meridian surface is 16mm, the blade thickness δ is 2mm, 26 blades are evenly distributed along the circumference, and each blade is evenly spaced to form a narrow cavity 5 , the other side of the blade is connected with the front disk, the front disk is hollow and ring-shaped, the outer diameter is the same as that of the base disk, and an air inlet hole is set in the middle, and the diameter D1 of the ai...

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Abstract

The invention relates to a forward skewed multi-blade impeller with a narrow cavity, which is used for a centrifugal fan and is low in noise, and an integral casting technique thereof. The impeller comprises a base plate and a hollow front plate, and narrow blades are installed along the circumference between the base plate and the front plate. The difference lies in that the blades are arc-shaped; the radial length of each blade is 20mm-30mm; the outlet height H of the meridian plane of each blade is 10mm-20mm; the number of the blades distributed along the circumference is 20-60; and the whole impeller is integrally cast. The impeller is compact in structure, low in noise, light in weight, high in structural strength and simple and convenient in maintenance. By adopting a moveable blade mold structure to fabricate an impeller inner core blank removing mold so as to finish the integral casting of the impeller, the invention solves the technical problem of blank removal failure of a closed impeller with a narrow cavity and has the advantages of high casting precision and good quality of the impeller, low casting cost and high production efficiency. The technique is widely applicable for integral casting of various multi-blade impellers, with the effect obviously better than that of similar products.

Description

technical field [0001] The invention relates to a forward multi-blade narrow-cavity impeller with low-noise characteristics for a centrifugal fan and an integral casting process of the impeller. Background technique [0002] Centrifugal fans are widely used in various fields of industrial production. On the premise of ensuring the reliability of operation, the existing centrifugal fans are developing towards low-noise, high-efficiency, and energy-saving multi-blade centrifugal fans. Among them, the low noise of fans has been paid more and more attention, especially in the shipbuilding industry, the noise and vibration indicators of fans are becoming more and more strict. The impeller is the key component of the centrifugal fan, and the structure and processing technology of the impeller directly affect the various performances and noise indicators of the fan. [0003] Forward multi-blade narrow-cavity impellers are generally used in high-pressure, low-flow special centrifug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/28F04D29/30B22D25/02
Inventor 李志印余黎毛志强余成伟王勇任凡吴声敏彭光明彭文波张京伟
Owner CHINA SHIP DEV & DESIGN CENT
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