CA2098500A1 - Pulverizing chamber of a counterjet pulverizer - Google Patents
Pulverizing chamber of a counterjet pulverizerInfo
- Publication number
- CA2098500A1 CA2098500A1 CA 2098500 CA2098500A CA2098500A1 CA 2098500 A1 CA2098500 A1 CA 2098500A1 CA 2098500 CA2098500 CA 2098500 CA 2098500 A CA2098500 A CA 2098500A CA 2098500 A1 CA2098500 A1 CA 2098500A1
- Authority
- CA
- Canada
- Prior art keywords
- pulverizing chamber
- wearing
- chamber according
- basal part
- wearing ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/06—Jet mills
- B02C19/065—Jet mills of the opposed-jet type
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
This invention relates to a pulverizing chamber of a counterjet pulverizer, which chamber is mainly cylindrical and at least two conically arranged, to a common point (2) directed accelerating nozzles (1) terminate at it, the inner walls of which pulverizing chamber are made of a wearing-resistant special material. The invention is characterized in that the pulverizing chamber comprises a fixed basal part (3), in the vicinity of whose open end the accelerating nozzles (1) terminate, as well as of an exchangeable wearing ring (5) mounted rotatably on this open end, whereby the contact surfaces (6) of the basal part (3) and the wearing ring (5) are formed as sliding surfaces.
Description
WO 92~11090 PCT/F191/004011 A pulverizing chamber of a coun-terJet pulverizer This invention relates to a pulverizing chamber of a counterjet pulverizer, which chamber is mainl~
cylindrical and at least two conically arranged, to a common point directed accel~rating nozzles terminate at it, the inner walls of which pulverizlng chamber are made of a wearing-resistant sp~cial material.
In such a counterjet pulveri~er, the pulverization occurs mainly autogenously in a pulverlzing chamber having a sma~l volume, in-to which the material to be pulveri2ed flows at a high speed via ~he ac~elerating nozzles of the, pulveri~er and supported by a working gas. The gas/material jets impact against each-t other at ~heir common intersection, whereby the pulverization o~
mater~al particles i~ caused by the impact effect. The pulverizing nozz~es are arranged ~lightly conically relative to each other such ~ha~ the mate,rial particles would pen~trate into the opposi-te ~ozzl~s or nozzle to an extent as low as possible.
The par~icles, which ~o no~ crush a~ the interse~tion of the gas/paxticle ~e~s, impac~ against a wall of the pulverizing chamber at a high speed, whlch causes wearing of the wall especially ~n those parts of the pulverizing chamber, which are loca~ed on the opposi~e side of the oriice of the noz~l~, and i~ the a~ial dlrect$on between the inter~ection of the gasJmaterial ~ets and the outlet op~ning o~ th~ pulverizin~ c~am~er. Because of this, the pulveriz~ng chamber must be made of e~peciall~ wearing-resistant special materials, which are expenslve and di~ficult to fa~ricate and trea~.
,,~ .
The object of the present ~nven~ion is the entension of the operating life and the facilitation of the fabrica- .
tion ~f a pulverizing chamber of a counterjet pulverizer. : -W~92~11090 ~$~ PCT/F191/0~ W
In accordance ~th the inventio~, this ma~ be solved such ~ha~ the pulvertzing ch~mber comprises a ~ixed basal part, in the ~icini~y o whose open end the accelerating nozzles ~rminate, as well as an exohangeable wearing 5 ring mounted rotatably on th~s open end, whereby the contact suraces of the fixed part and the wearing ring r are formed as sliding surfac~s.
.
The other characteristics of the invention appear rom the enclosed claims l to 9.
The inven~ion is next described in more detail with reference to the accompanying drawingt in which Fig. 1 is an axial sectional view of the inven~ive pulverizing chamber, in which certain alternati~e embodiments of different ~omponents are shown by way o example, and Fig. 2 shows the pulv~rizing chamber of F~g. 1 seen fxom the ~op.
.
Fig. 3 is a more detailed side elevation of one certain preferred embodime~t of the i~ven~lon as an axial sec~o~, in w~ich the a~tachment of the accelera-tion nozzle is shown~
The pulverizing chamber of the counter~et pul~erizer is main~y ~ylindrical and at least two coniGally ~xranged, ~o a common p~int 1 direo~ed accelera~ing nozzles 2 terminate at it, which are.arranged slightly conically rela~ o each other such ~hat ~he material particles woul~ penetrate into the opposite nozzle 1 ~o an exten~
as low as possible. Around this lntersection 2 an actual wearing zone is formed. The inner walls of the pulveri-zi~g ~hamber are subjedted ~o a ve~y high wearing stress at least a~ ~hose poin~s, against which the material .
, , . . .
WO92/110~0 ~ PCT/F191/00400 particles penetrating uncrushed thr~ugh the pulverizing ~one 2 impact. Because of this, the inner walls of the pulveriz.ing chamber must be made of especlally wearing-re~istant spPcial ma~erials, which are expensive and di~icult to fabricate and treat9 By means of the solution according to the invention, it has been possible to multiply the operatlng life of the pulverizlng chamber at the same t$me as its fabrication costs at least in somes cases have considerably decreased. Such a good resul~ is achleved when the pulverizing chamber is fabrica~ed such that it comprises a fixed basal part 3, in th~ ~icinity of whose open end are arranged inlet openlngs 4 for the orifices of the accelerating noz~les l. At the open end of the basal part 3 an exchangeable wearing rlng 5 is rotatably arranged, whereby the contact surfaces o ~he basal part 3 and the waaring xing ~ are ormed as ~lidlng surfaces 6.
Th~ inve~tive pulverizlng chamber is used such that a~
20 int~rval s o~ ~ couple of hundreds of operating hoursg dependtng on the material to b~ pulveriz~d, the wearing ring ~ of the pulverizlng chamber is rota~ed by some degrees around its axis, whereby worn sectlons move away . from the point where th~ wearing ls at its highest. The :~ 25 stepwise ro~atlon of ~he w~arlng rlngs can be performed so many times at said intervals that the first worn .~ .
sections Qn~er the following poin~ subjected ~o heavy weari~g, whereby the wearing ring must be replaced with a new on~. If ~h~ wearin~ in the axial directlon is ~ery 30 limlted, it i8 pre~rable to design both end suraces o~ ~
the wearing ring 5 such tha~ the wear~ng ring 5 can till be turned arou~d, whereby ~he opera~ing lie of the wearing ring is duplicated.
The sliding surfaces 6 have to be d~rected so that the gas~material ~ets rapidly flowing ~rom the accelerating nozzle 1 cannot penetrate into them, whereby the most .',, ', , simple alternative is to arrange them completely radial, but in this case the sliding surfaces 6 do not facilitate the concentration of the pulverizing chamber parts 3 and 5.
If a built-in concentration capacity is desired for the construction, the sliding surfaces 6 may be e.g. designed in the form of a truncated cone, or if a very accurate concentration is necessary, the sliding surfaces 6 may be designed such that one sliding surface 6 has a longitudinal groove and the other, or opposite sliding surface 6 has a ridge that completely fits into this groove, as shown on the right-sided side wall of Fig. 1.
If a heavy-wearing material is pulverized with the counterjet pulverizer, it is useful to fabricate both the basal part 3 and the wearing ring 5 from the same special material, but if the wearing concentrate only on those points of the walls of the pulverizing chamber, which axe located on the opposite side of the orifice of each . ;.
pulverizing chamber 1 and in the axial direction, with respect to the intersection of the gas/material jets, on the side of an outlet opening of the pulverizing chamber, the basal part 3 may be fabricated preferably from steel.
If wearing occurs n a very limited area, the pulverizing chamber may be comprised of several wearing rings 5, whereby the wearing ring, which is subjected to heavier wearing, is rotated more often and replaced at more frequent intervals than a wearing ring 5 located in a more protected space.
For keeping the different parts 3, 5 together, it is preferable that the entire pulverizing chamber is mounted inside a separate frame structure 8.
The drawing shows two alternative embodiments of how the accelerating nozzles 1 are brought into the pulverizing WO9~/11090 ~ 3~ ~CT/~ /O~OO
chamber. If the material to be pulverlzed is a heavily-wearing material, the right-sided solution i~ preerable, since it is capable of protecting the ends of the accelerating nozzles 1 from wearing excessively. I~, by contrast, a softer material is pul~eriz~d or if the ! material to be pulverized ~s by its particle s~ze ~ery fin~-powdered, ~he left-sided solution is better, whereby also the ends of the accelerating nozzles may be brought closer to the pulverizing zone.
The pulverizing chamber may be made by its construction either fully circular or brought into a orm of a regular polygon. In the latter case, the number of sides of the polygon defines how many degr~es the wearing ring must bo rotated.at a time.
The attachment of the accelera~ing nozzles 1 to the rame structure 8 and an accurate concentration with respect to the lntersQation 2 may be pre~erably ~eallz~d such that 2a at each end of each accalera~ing nozzle 1 is arranged a pair of O-rings 10, surrounding the accelerating nozzle 1 and adjustable by means of a clamping ring 9. This solu~ion also e~fectively prevents ~he entry o~ dust into the surrounding ~pace at the same ~ime as the structure 25 a::ts as an aff~ctive damper for vi}:ratlons and a possible resonance.
":
' ~.
cylindrical and at least two conically arranged, to a common point directed accel~rating nozzles terminate at it, the inner walls of which pulverizlng chamber are made of a wearing-resistant sp~cial material.
In such a counterjet pulveri~er, the pulverization occurs mainly autogenously in a pulverlzing chamber having a sma~l volume, in-to which the material to be pulveri2ed flows at a high speed via ~he ac~elerating nozzles of the, pulveri~er and supported by a working gas. The gas/material jets impact against each-t other at ~heir common intersection, whereby the pulverization o~
mater~al particles i~ caused by the impact effect. The pulverizing nozz~es are arranged ~lightly conically relative to each other such ~ha~ the mate,rial particles would pen~trate into the opposi-te ~ozzl~s or nozzle to an extent as low as possible.
The par~icles, which ~o no~ crush a~ the interse~tion of the gas/paxticle ~e~s, impac~ against a wall of the pulverizing chamber at a high speed, whlch causes wearing of the wall especially ~n those parts of the pulverizing chamber, which are loca~ed on the opposi~e side of the oriice of the noz~l~, and i~ the a~ial dlrect$on between the inter~ection of the gasJmaterial ~ets and the outlet op~ning o~ th~ pulverizin~ c~am~er. Because of this, the pulveriz~ng chamber must be made of e~peciall~ wearing-resistant special materials, which are expenslve and di~ficult to fa~ricate and trea~.
,,~ .
The object of the present ~nven~ion is the entension of the operating life and the facilitation of the fabrica- .
tion ~f a pulverizing chamber of a counterjet pulverizer. : -W~92~11090 ~$~ PCT/F191/0~ W
In accordance ~th the inventio~, this ma~ be solved such ~ha~ the pulvertzing ch~mber comprises a ~ixed basal part, in the ~icini~y o whose open end the accelerating nozzles ~rminate, as well as an exohangeable wearing 5 ring mounted rotatably on th~s open end, whereby the contact suraces of the fixed part and the wearing ring r are formed as sliding surfac~s.
.
The other characteristics of the invention appear rom the enclosed claims l to 9.
The inven~ion is next described in more detail with reference to the accompanying drawingt in which Fig. 1 is an axial sectional view of the inven~ive pulverizing chamber, in which certain alternati~e embodiments of different ~omponents are shown by way o example, and Fig. 2 shows the pulv~rizing chamber of F~g. 1 seen fxom the ~op.
.
Fig. 3 is a more detailed side elevation of one certain preferred embodime~t of the i~ven~lon as an axial sec~o~, in w~ich the a~tachment of the accelera-tion nozzle is shown~
The pulverizing chamber of the counter~et pul~erizer is main~y ~ylindrical and at least two coniGally ~xranged, ~o a common p~int 1 direo~ed accelera~ing nozzles 2 terminate at it, which are.arranged slightly conically rela~ o each other such ~hat ~he material particles woul~ penetrate into the opposite nozzle 1 ~o an exten~
as low as possible. Around this lntersection 2 an actual wearing zone is formed. The inner walls of the pulveri-zi~g ~hamber are subjedted ~o a ve~y high wearing stress at least a~ ~hose poin~s, against which the material .
, , . . .
WO92/110~0 ~ PCT/F191/00400 particles penetrating uncrushed thr~ugh the pulverizing ~one 2 impact. Because of this, the inner walls of the pulveriz.ing chamber must be made of especlally wearing-re~istant spPcial ma~erials, which are expensive and di~icult to fabricate and treat9 By means of the solution according to the invention, it has been possible to multiply the operatlng life of the pulverizlng chamber at the same t$me as its fabrication costs at least in somes cases have considerably decreased. Such a good resul~ is achleved when the pulverizing chamber is fabrica~ed such that it comprises a fixed basal part 3, in th~ ~icinity of whose open end are arranged inlet openlngs 4 for the orifices of the accelerating noz~les l. At the open end of the basal part 3 an exchangeable wearing rlng 5 is rotatably arranged, whereby the contact surfaces o ~he basal part 3 and the waaring xing ~ are ormed as ~lidlng surfaces 6.
Th~ inve~tive pulverizlng chamber is used such that a~
20 int~rval s o~ ~ couple of hundreds of operating hoursg dependtng on the material to b~ pulveriz~d, the wearing ring ~ of the pulverizlng chamber is rota~ed by some degrees around its axis, whereby worn sectlons move away . from the point where th~ wearing ls at its highest. The :~ 25 stepwise ro~atlon of ~he w~arlng rlngs can be performed so many times at said intervals that the first worn .~ .
sections Qn~er the following poin~ subjected ~o heavy weari~g, whereby the wearing ring must be replaced with a new on~. If ~h~ wearin~ in the axial directlon is ~ery 30 limlted, it i8 pre~rable to design both end suraces o~ ~
the wearing ring 5 such tha~ the wear~ng ring 5 can till be turned arou~d, whereby ~he opera~ing lie of the wearing ring is duplicated.
The sliding surfaces 6 have to be d~rected so that the gas~material ~ets rapidly flowing ~rom the accelerating nozzle 1 cannot penetrate into them, whereby the most .',, ', , simple alternative is to arrange them completely radial, but in this case the sliding surfaces 6 do not facilitate the concentration of the pulverizing chamber parts 3 and 5.
If a built-in concentration capacity is desired for the construction, the sliding surfaces 6 may be e.g. designed in the form of a truncated cone, or if a very accurate concentration is necessary, the sliding surfaces 6 may be designed such that one sliding surface 6 has a longitudinal groove and the other, or opposite sliding surface 6 has a ridge that completely fits into this groove, as shown on the right-sided side wall of Fig. 1.
If a heavy-wearing material is pulverized with the counterjet pulverizer, it is useful to fabricate both the basal part 3 and the wearing ring 5 from the same special material, but if the wearing concentrate only on those points of the walls of the pulverizing chamber, which axe located on the opposite side of the orifice of each . ;.
pulverizing chamber 1 and in the axial direction, with respect to the intersection of the gas/material jets, on the side of an outlet opening of the pulverizing chamber, the basal part 3 may be fabricated preferably from steel.
If wearing occurs n a very limited area, the pulverizing chamber may be comprised of several wearing rings 5, whereby the wearing ring, which is subjected to heavier wearing, is rotated more often and replaced at more frequent intervals than a wearing ring 5 located in a more protected space.
For keeping the different parts 3, 5 together, it is preferable that the entire pulverizing chamber is mounted inside a separate frame structure 8.
The drawing shows two alternative embodiments of how the accelerating nozzles 1 are brought into the pulverizing WO9~/11090 ~ 3~ ~CT/~ /O~OO
chamber. If the material to be pulverlzed is a heavily-wearing material, the right-sided solution i~ preerable, since it is capable of protecting the ends of the accelerating nozzles 1 from wearing excessively. I~, by contrast, a softer material is pul~eriz~d or if the ! material to be pulverized ~s by its particle s~ze ~ery fin~-powdered, ~he left-sided solution is better, whereby also the ends of the accelerating nozzles may be brought closer to the pulverizing zone.
The pulverizing chamber may be made by its construction either fully circular or brought into a orm of a regular polygon. In the latter case, the number of sides of the polygon defines how many degr~es the wearing ring must bo rotated.at a time.
The attachment of the accelera~ing nozzles 1 to the rame structure 8 and an accurate concentration with respect to the lntersQation 2 may be pre~erably ~eallz~d such that 2a at each end of each accalera~ing nozzle 1 is arranged a pair of O-rings 10, surrounding the accelerating nozzle 1 and adjustable by means of a clamping ring 9. This solu~ion also e~fectively prevents ~he entry o~ dust into the surrounding ~pace at the same ~ime as the structure 25 a::ts as an aff~ctive damper for vi}:ratlons and a possible resonance.
":
' ~.
Claims (9)
1. A pulverizing chamber of a counterjet pulverizer, which chamber is mainly cylindrical and at which at least two conically arranged, to a common point (2) directed accelerating nozzles (1) terminate, the inner walls of which pulverizing chamber are made of a wearing-resistant special material, characterized in that the pulverizing chamber comprises a fixed basal part (3), in the vicinity of whose open end the accelerating nozzles (1) terminate, as well as of an exchangeable wearing ring (5) mounted rotatably on this open end, whereby the contact surfaces (5) of the basal part (3) and the wearing ring (5) are formed as sliding surfaces.
2. A pulverizing chamber according to Claim 1, characterized in that both end surfaces (6) of the wearing ring (5) are of the same shape, whereby the wearing ring (5) may be turned around.
3. A pulverizing chamber according to Claim 1 or 2, characterized in that the sliding surfaces (6) are radial.
or extend conically.
or extend conically.
4. A pulverizing chamber according to Claim 3, characterized in that one sliding surface (6) has a longitudinal groove and the other one has a ridge that completely fits into said groove.
5. A pulverizing chamber according to any of the preceding Claims, characterized in that the basal part (33 and the wearing ring, (5) are made of same material.
6. A pulverizing chamber according to any of the preceding Claims 1 to 4, characterized in that the basal part (3) is made of ordinary steel and the wearing ring (5) is made of a special material.
7. A pulverizing chamber according to any of the preceding Claims, characterized in that it has at least two wearing rings (5) placed on top of each other.
8. A pulverizing chamber according to any of the preceding Claims, characterized in that the basal part (3) and the wearing ring (5) are mounted on a separate frame structure (8).
9. A pulverizing chamber according to Claim 8, characterized in that the attachment of the accelerating nozzles (1) to the frame structure (8) and an accurate concentration with respect to the intersection (2) are realized such that at each end of each accelerating nozzle (1) is arranged a pair of O-rings (10), surrounding the accelerating nozzle (1) and adjustable by means of a clamping ring (9).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI906266A FI86514C (en) | 1990-12-19 | 1990-12-19 | Mill chamber for a counter-jet mill |
| FI906266 | 1990-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2098500A1 true CA2098500A1 (en) | 1992-06-20 |
Family
ID=8531613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2098500 Abandoned CA2098500A1 (en) | 1990-12-19 | 1991-12-19 | Pulverizing chamber of a counterjet pulverizer |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0561897A1 (en) |
| AU (1) | AU9060191A (en) |
| CA (1) | CA2098500A1 (en) |
| FI (1) | FI86514C (en) |
| WO (1) | WO1992011090A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5521297A (en) | 1993-06-04 | 1996-05-28 | Salk Institute Biotechnology/Industrial Associates | Nucleic acids encoding human metabotropic glutamate receptors |
| AUPN388195A0 (en) * | 1995-06-29 | 1995-07-20 | Glover, Mark Richard | Water grinding of particulate material using high and ultra high pressure water processing |
| AUPN829796A0 (en) * | 1996-02-23 | 1996-03-21 | Bengold Holdings Pty Ltd | Improved grinding method and apparatus for performing same |
| DE10008373C2 (en) * | 2000-02-23 | 2002-11-28 | Helmut Adelsberger | Method and device for determining ion channel activity |
| RU2153937C1 (en) * | 2000-03-07 | 2000-08-10 | Черников Игорь Александрович | Vortex-type mill |
| EP1667797B1 (en) * | 2003-09-19 | 2011-05-25 | Micropulva Ltd. Oy | Improved acceleration nozzle for gas-solids suspension |
| WO2015071528A1 (en) * | 2013-11-14 | 2015-05-21 | Micropulva Ltd Oy | Method for limiting an amount of its particle size smallest fraction which is generated in the counterjet grinding process of minerals |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI74222C (en) * | 1985-09-18 | 1988-01-11 | Finnpulva Ab Oy | KVARNHUS FOER TRYCKAMMARKVARN. |
-
1990
- 1990-12-19 FI FI906266A patent/FI86514C/en not_active IP Right Cessation
-
1991
- 1991-12-19 WO PCT/FI1991/000400 patent/WO1992011090A1/en not_active Application Discontinuation
- 1991-12-19 AU AU90601/91A patent/AU9060191A/en not_active Abandoned
- 1991-12-19 CA CA 2098500 patent/CA2098500A1/en not_active Abandoned
- 1991-12-19 EP EP19920900697 patent/EP0561897A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| FI906266A0 (en) | 1990-12-19 |
| EP0561897A1 (en) | 1993-09-29 |
| WO1992011090A1 (en) | 1992-07-09 |
| FI86514C (en) | 1992-09-10 |
| FI906266A (en) | 1992-05-29 |
| FI86514B (en) | 1992-05-29 |
| AU9060191A (en) | 1992-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19960619 |