CN2045673U - Supersonic speed supermini disintegrating mill - Google Patents

Abstract

The utility model discloses a supersonic speed ultramicro disintegrator which utilizes the aerodynamic experiment technology, comprising a stable section, a jet pipe, a target chamber, a hopper, pipe lines, etc. The jet pipe is designed into a curved plane, primary materials which need to be disintegrated make an accelerated movement with a supersonic airflow which is generated when flowing across the jet pipe, and under low temperature, primary materials strike to each other for the disintegration and collide to the target head for the further disintegration in an instant. The disintegrating efficiency and the disintegrating quality are raised, and the disintegrating average particle diameter can be below 10 mu. Besides, the utility model can be used widely.

Description

Supersonic speed supermini disintegrating mill

The utility model relates to the pulverizer of raw materials such as a kind of crushing metal, ore, pottery.Be particularly related to a kind of micronizer.

The utility model is to utilize spacecraft---wind tunnel technique promptly produces the principle of supersonic airstream behind the special jet pipe of the airflow passes of certain pressure.

The clear 61-27104(1986 in Japan special permission Room June 24) disclose a kind of airslide disintegrating mill, this pulverizer does not have stable section.The jet pipe profile is simple linear pattern, and the target head is designed to square, and the target chamber outlet is designed to straight line.Not only efficient is low, energy consumption is big; While is comminuting matter most effectively.

Task of the present utility model is for Xerox provides qualified carbon dust, designs a kind of supersonic speed micronizer, improves crush efficiency to reach, powder particle diameter is little and uniform purpose.

This pulverizer is to adopt following proposal to realize.

A kind of supersonic speed micronizer of mainly forming by hopper, stable section, jet pipe and target chamber, jet pipe is that interior profile is the supersonic nozzle of curved surface, and hopper is fixed on the jet pipe outer wall, and it is affixed that an end of stable section and an end of jet pipe are pressed axis.It is affixed that one end of the other end of jet pipe and target chamber is pressed axis, it is characterized in that the profile normal direction has the hole in the jet pipe, and described hole communicates with hopper.Coarse fodder and material inlet are housed on the end cap of hopper, sieve plate and plug valve are equipped with successively in axial symmetry line place a side of hopper end cap, described target chamber is the garden tee section, and the target chamber inlet docks with profile axis direction perforate in the jet pipe, described target chamber is equipped with the conical target head that can move on the target chamber line of symmetry, described target chamber is equipped with the tilting convergence outlet of taper, before the described pulverizer jet pipe stable section is arranged, and it is affixed that jet pipe and stable section are pressed axis.

Below this pulverizer is described in further detail.

1. the utility model design has stable section, guarantees air stream flow, the constant pressure of nozzle for supplying, and nozzle exit has stable supersonic airstream.The diameter of stable section designs according to the principle that flow equates, and the flow velocity of stable section should be got the M number and calculates less than 0.01.The length of stable section is generally got 1.5 times of stable section diameter.Stable section is connected with ring flange with jet pipe, and seals with sealing ring.

2. jet pipe of the present utility model is a supersonic nozzle, and air-flow has higher ram compression (dynamic pressure q=1/2 ρ V ²), improved the crush efficiency of pulverizer.

3. in the utility model hopper mouth a sieve plate is arranged, its effect is the weight of bearing material in the hopper, prevents that material is at hopper and jet pipe in blanking channel " bridging ".Material is owing to exist pressure differential and automatic feed between hopper and the jet pipe wall.Hopper is connected with flange disc with jet pipe.And seal with sealing ring.One plug valve is arranged, in order to the control inlet amount in the utility model hopper.

4. the target head in the utility model target chamber adopts conical target head, and its effect is when guaranteeing from supersonic airstream bump target head that jet pipe comes out, also to be supersonic airstream.The cone angle of target head decides by the hardness of comminuting matter.Generally speaking, semi-cone angle is selected between 20 °～90 °.

Target chamber is connected with ring flange with jet pipe, and seals with sealing ring.

The tilting pipe design of target chamber becomes the band tapering, mainly is in order to improve the economy of equipment, to make nozzle exit that stable supersonic airstream be arranged, and be not subjected to the influence of classifying equipoment thereafter.

45 ° of angles of tilting conduit axis and target chamber axis, tapering is generally chosen between 1:5～1:15, and this depends mainly on the size of the height or the flow of nozzle velocity.

5. jet pipe of the present utility model adopts the analytic method design, has so just reduced the pressure loss of jet pipe moderate supersonic speed stream in accelerator, thereby has reduced energy consumption.

Jet pipe is got sliding fit in nozzle section, strict sealing between outer shell of column and the jet pipe.

The calculating of jet pipe profile:

The jet pipe profile mainly is made up of three parts, i.e. converging portion, expansion segment and changeover portion.It is to use analytic method that its profile is calculated, and the fundamental curve that calculates also will carry out boundary-layer, and quality is added the correction of influence, and handles suspended particles stream with permanent decalage method.

The AB section is a converging portion in the accompanying drawing 3, designs with empirical equation.Formula is:

1/(A ²) － 1/(A ₁ ²) ＝（ 1/(A ₂ ²) － 1/(A ₁ ²) ）（ (X)/(L) － 1/(2π) Sin (2πX)/(L) ）

A is a sectional area, and footnote 1,2 is imported and exported area for converging portion, and L is a length;

The BC section is an expansion segment, is calculated as follows (sweep)

D is the nozzle exit diameter, and α is for flowing to semi-cone angle;

The DE section is a changeover portion, and computing formula is:

Wherein $F\left(\mathrm{\θ}\right)=\sqrt{[{\mathrm{Sin}}^2\mathrm{\θ}+2(\mathrm{Cos\θ}-\mathrm{Cos\α})(\sqrt{M^2-1}\mathrm{Sin\θ}+\mathrm{Cos\θ})]}$

θ is a flow angle;

At last converging portion abscissa R ' is reached the correction that the Y value is carried out boundary-layer displacement thickness and quality interpolation influence.Correction factor the former between 0.006～0.018, the latter chooses between (look its addition what) 0.10～0.50.

The utility model novel structure, cost is low, and the pulverizing scope is wide, quality good, efficient is high.

This supersonic speed micronizer is to utilize airflow kinetic energy to come the machinery of work done.The compressed air of drying by special jet pipe adiabatic expansion, is set up supersonic airstream, and static temperature sharply descends.Meanwhile, because the negative pressure ejector action of supersonic airstream needs material crushed when hopper suction air-flow accelerating sections, quicken with air-flow, at this moment material collides mutually in accelerator and pulverizes, and hits the target head with high speed, and its moment is further pulverized.Powder after the low-temperature grinding tilting pipeline of flowing through send grader, and in grader, because the centrifugal action of air-flow, the pulverulent product of release mesh takes out, and reenters pulverizer than the material of coarseness and pulverizes.Advantage of the present utility model is to utilize supersonic airstream to quicken by the pulverizing of comminuted material, and the material scope of being pulverized is wide, and can to pulverize Mohs' hardness be 9.36 boron carbide, all can obtain the little and uniform micropowders of particle diameter.And this mill structure is reasonable, and is cheap.

Accompanying drawing 1 is the utility model structural representation.Wherein: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. stable section of sieve plate of material inlet of motor of coarse fodder mouth of hopper of plug valve of jet pipe of target head of target chamber

Accompanying drawing 2 is the utility model process chart, wherein: 1. 2. 3. 4. 5. blower fan of sack cleaner of whirlwind of grader of pulverizer

Accompanying drawing 3 is the utility model jet pipe schematic diagram.

Below in conjunction with accompanying drawing embodiment is described.

The utility model is made up of following components: (seeing accompanying drawing 1)

1. stable section is 10.:

10. treated dry air enters stable section by pipeline, and high pressure draught is at this flow velocity that slows down.Stable section 10. diameter and the flow velocity of local air-flow and jet pipe 3. throat diameter is closely related, stable section length 10. depends on stable section diameter 10..The angle of flare of its expansion is unsuitable excessive, to reduce unnecessary windage loss.The stable section 10. effect in pulverizer mainly is the potential energy that recovers air-flow.

2. jet pipe is 3.:

This part is the core of pulverizer, and jet pipe 3. contraction section adopts the exact Analytic Method design.The jet pipe of this purposes 3..Be different from the jet pipe that wind tunnel test is used, having in the incoming flow needs the material crushed particle.Therefore we have handled floating outstanding particle flux with permanent decalage method, have also considered the correction that boundary-layer and quality are added.The 3. interior profile of whole jet pipe is designed to curved surface.Help setting up desirable supersonic flow field like this, can avoid energy loss simultaneously.

3. target chamber is 1.:

1. target chamber is that stuff and other stuff stream quickens, the section of fragmentation, and this part designs according to the supersonic jet principle.Supersonic jet go out jet pipe 3. after, be not to continue expansion to quicken, but the round platform district that the supersonic domain cross section reduces gradually, the length that this is regional has also just determined 2. present position of target head.What any also should be described here is to different materials.Target head 2. present position has an optimum value, should adjust in the use.1. target chamber is designed to the garden cylindricality, and 2. the target head is designed to taper.

In order to be designed to the mobility status of supersonic jet, the border of truncated cone-shaped supersonic domain should be one and freely flow the border.Therefore, target chamber diameter and jet pipe 1. has certain corresponding relation between 3..

The supersonic airstream band particle hits target head 2. after, mixed flow is with certain angle, shrinks tilting pipeline through one section and sends into the micro-powder graded machine of Cyclonic and carry out classification.

4. hopper is 5.:

5. hopper is the container of temporary transient charge and feeding, and the upper end top cover has two charging apertures, one be material inlet 8., one is the coarse fodder import after the grader classification, the negative pressure self-feeding is adopted in feeding.Need jet pipe 3. charging aperture form negative pressure.Lower ending opening docks with the 3. interior profile normal direction perforate of jet pipe.

For prevent than fine powder hopper 5. in " scaffolding ", stir with puddler.In order to prevent that impure big particle diameter material blocking channel is arranged in the raw material.One sieve plate is arranged 9. in the hopper, can stop big particle diameter material to fall.

The utility model implementation result is good, and its debug results is as follows:

Unloaded flow field velocity: the M=3.291 of target chamber～3.625

Be suitable for bleed pressure: 7.5～12 kg/cm

Disposal amount: (doing the standard material check with powdered whiting)

50～70 kilograms/hour (small-scale production machine)

～5 kilograms/hour 0.5 (use for laboratory machine)

Pulverize hardness (Mohs): less than the hardness 9.36 of 9.36(boron carbide).

The utility model model machine is produced voluntarily by us. Use dry straightly, reach even surpassed design objective. Successfully for three kinds of duplicators such as " Xerox ", " Sharp ", " Sanyo " provide required consumable material, all reached instructions for use. We have also pulverized 50 various materials such as powdered whiting, precipitated calcium carbonate, kaolin, mica, iron oxide red, graphite, coke, and crushing effect is all very desirable, and average grain diameter generally reaches in 10 μ. Some material average grain diameter reaches 0.67 μ. Crushing effect is fine, has many uses.

Test result is as follows in actual the use:

Table 1

Particle diameter (μ)	Kaolin %	Particle diameter (μ)	Kaolin %
				＜0.5	46.1	＜6.0	95.7
＜1.0	64.9	＜7.0	97.6
				＜2.0	78.5	＜8.0	99.2
＜3.0	83.5	＜9.0	99.6
				＜4.0	89.4	＜10.0	100
＜5.0	93.0	Average grain diameter (μ)	0.60

Table 2

Claims (1)

1. A kind of mainly by hopper, stable section, the supersonic speed micronizer that jet pipe and target chamber are formed, hopper is fixed on the outer wall of jet pipe, it is affixed that one end of stable section and an end of jet pipe are pressed axis, it is affixed that one end of the other end of jet pipe and target chamber is pressed axis, it is characterized in that jet pipe is that interior profile is the supersonic nozzle of curved surface, the profile normal direction has the hole in the jet pipe, described hole communicates with hopper, the import of coarse fodder and raw material is housed on the end cap of hopper, sieve plate and plug valve are equipped with successively in axial symmetry line place a side of hopper end cap, described target chamber is the garden tee section, the target chamber inlet docks with profile axis direction perforate in the jet pipe, and described target chamber one end is equipped with the target head that can move on the target chamber line of symmetry, and described target chamber is equipped with the tilting convergence outlet of taper, before the described pulverizer jet pipe stable section is arranged, it is affixed that jet pipe and stable section are pressed axis.

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