CN1030937C - Mixed flow blower and its inspection equipment of impeller - Google Patents

Abstract

The present invention relates to a mixed flow type blower which is used and developed in order to be used for a middle and low pressure (a pressure head is about 1200mm water column) blower. In order to reduce manufacture cost, an impeller adopts a metal plate assembly structure, and an attention is given to enhance the rigidity and the centrifugal intensity resistance. The mixed flow type blower has the characteristics of high efficiency and low noise; the present invention is also matched with an impeller inspection device which is matched with the mixed flow type blower.

Description

Mixed flow blower

The present invention relates to mixed flow blower, can be used as pressure head and be the blower about the 1200mm water column, have the efficient height, the characteristics that noise is low also can be used as the universal blower of low pressure.

As everyone knows, the above high pressure blower of pressure head 5000mm water column has the mixed flow type, but pressure head is not used less than the mixed flow type reality of 1200mm water column.

The impeller of mixed flow type in the past is by large-scale high-strength aluminium blank, makes by processing, and costs an arm and a leg, and is unsuitable for being used as general blower.

The purpose of this invention is to provide adoptable mixed flow blower below pressure head 1200mm water column, reach energy-conservation and improve environment.

In the present invention, in order to reduce manufacture cost, impeller adopts the assembly structure of sheet metal, and notes improving its rigidity and anti-centrifugal force intensity and constitute following mixed flow type impeller.

Make a cone with sheet metal with the trapezoidal radial facing of circular cone, within it on the side, with two annulus of making by plectane of size, and cylinder and the wheel hub thicker than its sheet metal, fix by methods such as welding or riveted joints, by these plectanes, cylinder and wheel hub strengthen the face centrifugal intensity of aforementioned cone, to keep concentric equalizing piston to be contained on the housing with this cylinder simultaneously, make the thrust balance in addition that acts on impeller, and in the welding of cone outside or rivet a plurality of blades and constitute impeller.

Like this, above-mentioned mixed flow type impeller itself, than the efficient height of in the past centrifugal type impeller, and because the effect of Diffuser, efficient height not only, and make inexpensive, the wall before and after constituting by the sheet metal of flat garden plate and taper.On this flat garden plate,, the space between two walls is separated corresponding of two adjacent each other parts with the suitable a plurality of parts of aforementioned two walls.Constitute a plurality of Diffusers with the space that aforementioned two walls form mutually, raise the efficiency with flaring straight line type path.

According to above-mentioned formation, the taper of mixed flow type impeller or trapezoidal the turning of garden awl can be adopted spinning, rolling-forming or press process, accurately and cheaply create, but also available sheet metal welding strengthened, in addition, mixed flow type impeller tilts because of blade system, can make the length of length of blade than radial mode, select for use under the same length of blade situation, impeller outer diameter just can be correspondingly little, rotating speed can be big like this, and little at the bending loses of ingress.Have again not to be parallel wall, but the wall in four directions, all around is the reduction speed ratio of flaring straight line type Diffuser, the parallel wall Diffuser of ratio centrifugal type in the past is big, and because path is a straight line, reason such as the eddy current loss that is caused by flow separation is little has been improved efficient significantly.Make the wall at Diffuser rear tilt to constitute taper, be impeller to be formed the mixed flow type flow and to be inclination, can make bending angle little, very reasonable, in mixed flow type in the past, it is generally acknowledged that Diffuser is a parallel wall for well, but may be interpreted as with combination of mixed flow type and path be that the double effects of straight line makes the efficient raising.

In addition, the inlet of mixed flow type impeller flow and centrifugal type more crooked little, so the little advantage of noise is also remarkable.

Describe most preferred embodiment of the present invention in detail according to accompanying drawing, wherein

Fig. 1 is a mixed flow blower integral body of the present invention, comprises the longitudinal plane side view of central shaft.

Fig. 2 is the profile diagram of radial mode impeller.

Fig. 3 is the front elevation of radial mode impeller.

Fig. 4 is the back elevation of sweepback type impeller.

Fig. 5 is the testing fixture figure of radial mode impeller.

The mat woven of fine bamboo strips 1 figure is a mixed flow blower integral body of the present invention, comprises the profile diagram of central shaft, and 1 is the air intake mouth mask among this figure, and 2 is impeller, and 3 is equalizing piston, and 4 is housing, and 5 is Diffuser, and 6 is bearing.7 is axle.This is the simplest single supporting means, also can hold at air intake oral-lateral assembly axis and form the dual-supporting mode.

When being the purposes of pressure head more than the 600mm water column, above-mentioned Diffuser 5 just is suitable for unnecessary use on common blower.

The present invention is textural relevant especially at above-mentioned mixed flow type impeller.

The structure of impeller is as the explanation of the 2 3rd figure, the mat woven of fine bamboo strips 4 figure, the 2nd figure is one of the longitudinal plane of a radial mode impeller example, it is just being looked like shown in the 3rd figure, in these figure, 201 are garden awl or trapezoidal the turning of garden awl, be called garden awl 201, it is that rolling-forming and compacting wait makes by sheet metal process spinning.Figure number 202,203 is the garden plate of ring-type, and the thickness of garden tube 204 is bored 201 big with the thickness of garden plate 202 than the garden, and the part of their suffered centrifugal force is born 201 enhancings of garden awl at this garden tube with garden plate 202.This structure is required in order to bear high speed rotating, simultaneously assembles equalizing piston on this tube inboard, garden, and in addition balance is used to make the end thrust of impeller.Proper methods such as garden awl 201 and welding of garden plate 202 usefulness or riveted joint are fixed garden tube 204 and garden awl 201 and 202 welding of garden plate.It is big that garden plate 203 is also bored 201 thickness than the garden, makes between the path end of it and garden tube 204 and garden awl, on the inboard of garden awl, with welding or proper method such as riveted joint is fixed.The internal diameter of garden awl 201 and garden plate 203 is welded on wheel hub 205, enhancing garden awl 201, and figure number 206 is the blade of plural number.On the mat woven of fine bamboo strips 3 figure, blade disposes with radiation by radial direction, and be fixed on the garden awl 201 with welding or proper method such as riveted joint, in addition, shown in the mat woven of fine bamboo strips 4 figure, 206 also can be processed into backward-swept blade, and blade adopts radial blade type or backward-swept blade type, by purposes decision, identical with the situation of common blower.

Constitute impeller 2 according to the method described above, can hold anti-high speed rotating, more obviously more cheap than in the past mixed flow type impeller.

When garden awl 201 as no garden plate 202,203 can hold anti-centrifugal force from the rigidity of dependence garden awl itself, the thickness that the garden will be bored the path side is thicker than the thickness of big footpath side, so just need change its size step by step, this structure only depends on casting or forges back machining and make, and its price that will become is very expensive like this, in contrast, impeller of the present invention is from the sheet material spinning, rolling-forming or press process become garden awl 201, can save machining, so low price.

In addition, will try one's best and be advisable for a short time in the gap between blade 206 and the air intake mouth mask 1, thereby cover 1 and bore 1 identical with the garden, use spinning, rolling-forming or press process are carried out machining after making on demand, blade 206 and cover 1 corresponding end face, for being coincide with cover, it processes in principle, but this processing method adopts special-purpose imitative type device in principle because thin being difficult to of blade cuts, by the gas cutting machine of its imitative type guiding support, plasma cutting machine, perhaps high speed sander processing.But, when hanging down, also can adopt machine cut as processing charges.

But before its fine finishing, with the angle of the inlet end 206a of blade, the inlet of like axial flow blower twists like that, makes blade import gas in the garden slidingly.Just need one for this reason and can take office the special device of checking blade angle in the meaning radius distance from the center.

The distortion of this blade inlet end 206a, press process is good in advance before blade installation, and Jie can be proofreaied and correct by hand, so that meet the requirement of above-mentioned testing fixture.

This testing fixture is by following principle work, and the 5th figure is the diagram of inspection body, has provided on garden awl 201, the situation that the blade 206 of a radial mode is fixing.X-X is the rotary middle spindle in garden 201, and this axle is by support S-S supporting.

P is a contact pilotage, the front end of this P is contacted blade tip 206a, make the garden coning change minute angle Δ φ, state when moving to B by an A, this, the some A, the some B be the distance that R is arranged from axle X-X, the axle direction displacement distance Δ X and the angle of rotation Δ φ of contact pilotage front end can be detected, and be installed on running shaft X-X, and can be free to slide rotation.

The detection means of its Δ X and Δ φ adopts electromagnetism length measuring machine and pulse motors to realize automation.And link with computer, can automatically indicate near the gradient the point of contact, perhaps can carry out manually, its concrete structure can be chosen wantonly.Gradient between some A, B, the first time are like being expressed as β ₁=Tan-((γ Δ φ/Δ X ₁).

In order to obtain more accurate data, awl minute angle Δ φ in rotation garden obtains β again ₁=Tan ^-1(γ Δ φ/Δ X ₂) and β=β ₁+ β ₂Calculate)/2.

For with the aid of pictures easily, A, B point are exaggerative intentionally to be left, and is actually and detects blade inlet end utmost point gradient nearby.Above online the carrying out of calculation available computers also can also can more promptly be handled by online use portable computer, whether adopts whether online deciding as circumstances require.

Testing fixture is as described below,, has the support with the axle X-X supporting of impeller that is, and under the front end situation to blade inlet end alignment contact pilotage, the inlet blade angle degree that the device of the small angle delta φ of blade rotation is formed detects testing fixture.

In addition, the processing device of blade front-end face can use suitable imitative type device and constitutes simply, so details is omitted.

In addition, equalizing piston 3 is different with blower in the past, and it is fixed on the body housing 4, and garden tube 204 only has some spaces with it, when preventing to leak, also makes the thrust balance in addition that acts on blade.But, the balance of this thrust should make some rearward promotion of thrust and blade 206 and cover 1 and do not contact, the 5th, a plurality of parts of on the plat part 101 of cover 1, fixing, shown in the mat woven of fine bamboo strips 1 figure, parts that this is adjacent and being complementary with it, it is a plurality of that taper shape housing sidewall 401 forms the straight line type path of flaring together, becomes Diffuser.Sidewall 401 is made for the garden taper, and for rationally, owing to be linear passages, when adopting this garden to bore, fluid also can not separate when impeller is the mixed flow type, and it is big that the deceleration effect of Diffuser becomes, and efficient improves.

According to impeller of the present invention, the mixed flow type failed to adopt in the mesolow field in the past, and the mixed flow type can practicability now, helped energy-conservation and reduced noise.

Claims (2)

1. mixed flow blower, make a cone with sheet metal with the trapezoidal surface of revolution of circular cone, it is characterized by: within it on the side, by welding or riveted joint, with two annulus of making by plectane of size, and cylinder and the wheel hub thicker than its sheet metal are fixed, by these plectanes, cylinder and wheel hub strengthen the anti-centrifugal force intensity of aforementioned cone, to keep concentric equalizing piston to be contained on the housing with this cylinder simultaneously, make the thrust balance in addition that acts on impeller, and in its cone outside welding or riveted joint a plurality of blades and constitute impeller.

2. mixed flow blower as claimed in claim 1 is characterized by: (5) and the conical housing sidewall (401) that is complementary with it of a plurality of parts of installing at air intake mouth mask plat part constitute a plurality of flaring straight line type paths and form Diffuser.

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