CN2690636Y - Hollow main shaft double suction F type centirfugal fan - Google Patents

Abstract

The utility model relates to a hollow main shaft double suction F type centrifugal fan. The utility model is characterized in that the main shaft of the fan is a hollow structure, and the calculating diameter increase and the weight decrease of the main shaft can be used to improve the critical rotation speed of the main shaft of the fan. As a consequence, the problems of the insufficient rigidity and the critical rotation speed and the unstable fan running when the fans of big machine number or big span are at high rotation speed or the big span are solved, which not only lessens the weight of the main shaft of the fan and improves the bending resistance strength, but also reduces the fan cost and improves the benefit ratio of the fan and the market competition power. The fan can be applied to the dust removal and the ventilation of industries, such as the steel, the cement, the electric power, the chemical industry, etc.

Description

Hollow spindle double suction F formula centrifugal blower

Technical field

The utility model belongs to the double-sucking type centrifugal blower that is used for dust discharge, ventilation and ventilation, particularly relates to a kind of hollow spindle double suction F formula centrifugal blower.

Background technique

At present, when the centrifugal blower of the big plane No. of design, big span, the critical speed of rotation n of blower fan main shaft _HIt is a vital design factor that need think better of.Because, if the rotation speed n of blower fan main shaft surpasses the critical speed of rotation n of main shaft _H, i.e. n＞n _HThe time, then will make centrifugal blower produce vibration, can produce high vibration or resonance when serious, at this moment will produce bigger collapsing force, and cause heavy losses.In order to ensure the safety of blower fan, the working speed n＜0.75n of technical requirements blower fan _H

The critical speed of rotation n of main shaft _HWith square being directly proportional of the calculated diameter D of main shaft, simultaneously, also the square root with the weight G of main shaft is inversely proportional to, if represent with functional expression, is: $n_H\&Proportional;f({\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="Y20042002876700051.png"\; state="\{\{state\}\}">D</figure-callout>}}^2/\sqrt{G}).$ When needs improve the rotation speed n of blower fan, just must at first improve the critical speed of rotation n of main shaft _H, for this reason, the main shaft diameter D overstriking accordingly of blower fan perhaps alleviates the weight G of main shaft, can improve the critical speed of rotation n of main shaft _HBut after the diameter D of main shaft chap, then the weight G of main shaft also can correspondingly increase, and like this, can make the critical speed of rotation n of main shaft again _HReduce, from functional expression as can be known, D and G form a pair of contradiction parameter.This will make the raising of rotation speed of fan be subjected to certain restriction, thereby influence the operation area of blower fan.If creatively the main shaft with blower fan changes hollow spindle into, then above-mentioned contradiction will be readily solved.

Summary of the invention

The utility model provides a kind of hollow spindle double suction F formula centrifugal blower for solving the technical problem that exists in the known technology.

The technological scheme that the utility model is taked for the technical problem that exists in the solution known technology is:

A kind of hollow spindle double suction F formula centrifugal blower, it mainly is made up of transmitting assemblies, inlet box, adjustment doors, casing, linkage mechanism, hollow spindle, impeller, intake grill and motor component, it is characterized in that: the hollow spindle of this blower fan is connected by the boss of spindle nose one and an end internal diameter of steel pipe, the other end internal diameter of steel pipe and the boss of spindle nose two are connected, on the external diameter of the middle position of steel pipe length, an impeller rotating disk is connected.

Advantage and the good effect that the utlity model has are: the main shaft of blower fan adopts the high-quality seamless steel pipe, welds two different spindle noses respectively in the two ends of steel pipe inner radius, and at impeller rotating disk of the neutral position of hollow spindle welding, forms the hollow spindle parts.This hollow spindle structure applications is in the design of the centrifugal blower of certain big plane No., big span, when can increase at the external diameter of hollow spindle, make the weight of main shaft descend about 37.5% on the contrary, thereby reached the purpose that improves the critical speed of rotation of main shaft, and after having solved the blower fan main shaft chap of big plane No., big span, weight increases, and has reduced the contradiction of critical speed of rotation on the contrary.Hollow spindle can make the rotating speed of blower fan further improve, and the performance zones of blower fan further is expanded.When hollow spindle increased at external diameter, the weight of its main shaft decreased, and hollow spindle is bigger than the resistance to flexure of solid main shaft, and rigidity is better, also can reduce the cost of blower fan, thereby had increased the profit margin of blower fan, had improved the market competitiveness of blower fan.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the structural representation of Fig. 1 hollow spindle.

Embodiment

For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:

See also Fig. 1 and Fig. 2, the casing 4 among Fig. 1, inlet box 2 are welded by steel plate, and its outside weldings has " well " word lattice gusset, and interior welds has arm, avoids producing vibration; Impeller 7 is the double suction structure, is welded with the 16Mn steel plate, is welded with the abrasionproof backplate at root of blade, and the build-up wear-resistant layer, to prolong the working life of impeller; Intake grill 8 is convergence, streamline structure, thereby it is minimum that loss is dropped to; Adjustment doors 3 is installed in the inlet of inlet box, and stator is a wing blades, can improve the adjusting efficient of blower fan, and rolling bearing is equipped with in support place of adjusting vane, rotates flexibly, reduces friction, and raises the efficiency, and uses reliable; Transmitting assemblies 1 (comprising bearing housing, coupling), bearing housing adopts thin oil lubricant and overlap joint type sealing configuration, is provided with air relief cock, adopts the water-cooling pattern cooling, solves the leakage of oil problem at all; Coupling is the rubbercushioned sleeve bearing coupling structure; The connecting rod two ends of linkage mechanism 5 connect with Hooks coupling universal coupling, make adjustment doors 3 easy to adjust, install more convenient.

Fig. 2 is the hollow spindle structural representation of present embodiment, one end internal diameter of the boss of spindle nose 1 and seamless steel pipe 602 is an interference fit, the other end internal diameter of steel pipe 602 and spindle nose 2 604 interference fit, after being about to steel pipe and adding thermal expansion, the two ends with spindle nose one and spindle nose two insert steel pipe respectively weld after the cooling again, at last, on the external diameter of the middle position of steel pipe length, install impeller rotating disk 603, and weld together.

Claims (1)

1. hollow spindle double suction F formula centrifugal blower, it mainly is made up of transmitting assemblies (1), inlet box (2), adjustment doors (3), casing (4), linkage mechanism (5), hollow spindle (6), impeller (7), intake grill (8) and motor (9) component, it is characterized in that: the hollow spindle of this blower fan (6) is connected by the boss of spindle nose one (601) and an end internal diameter of steel pipe (602), the boss of the other end internal diameter of steel pipe (602) and spindle nose two (604) is connected, on the external diameter of the middle position of steel pipe (602) length, an impeller rotating disk (603) is connected.

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