EP0694126A1 - Spinnpumpe für polyamide - Google Patents
Spinnpumpe für polyamideInfo
- Publication number
- EP0694126A1 EP0694126A1 EP95906876A EP95906876A EP0694126A1 EP 0694126 A1 EP0694126 A1 EP 0694126A1 EP 95906876 A EP95906876 A EP 95906876A EP 95906876 A EP95906876 A EP 95906876A EP 0694126 A1 EP0694126 A1 EP 0694126A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bores
- plate
- spinning
- spinning pump
- melt
- 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.)
- Granted
Links
- 238000009987 spinning Methods 0.000 title claims abstract description 25
- 239000004952 Polyamide Substances 0.000 title claims abstract description 9
- 229920002647 polyamide Polymers 0.000 title claims abstract description 9
- 239000000155 melt Substances 0.000 claims abstract description 10
- 238000002074 melt spinning Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 abstract 2
- 229920000642 polymer Polymers 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/086—Carter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2250/00—Geometry
- F04C2250/10—Geometry of the inlet or outlet
Definitions
- the invention relates to a spinning pump for melt spinning polyamides, consisting of a back plate, a front plate, a middle plate with a hole with a partially circular cross section for the supply of the melt and a hole with a partially circular cross section for the removal of the melt and a pair of gear wheels.
- Gear pumps for melt spinning polymer melts are known (EP-A2-0 447 766).
- the known spinning pumps are connected to a spinning pump block, which serves as a connection between an extruder and the spinnerets.
- the channels of the spinning pump block are directly connected to the drilling channels of the spinning pump.
- spinning nylon especially melt spinning nylon 6.6
- deposits are found in the spinning pump. which can become noticeable as increasing fluff numbers due to reduced quality in the course of the spinning time.
- Known spinning pumps have cylindrical inlet and outlet bores in the middle plate, which have deposits of polymer and its decomposition products after longer running times.
- the object of the invention is to provide a dead zone-free spinning pump for melt spinning polyamide 6.6, which makes it possible to ensure incrustation-free operation in order to achieve improved quality.
- Another task is to increase the productivity of the continuous melt spinning process of polyamide 6.6.
- the object is achieved in that the bores with the part-circular cross sections on the front of the middle plate are designed in such a way that the cross-sectional area of the bores against the back of the middle plate is reduced and the center points of the part-circular bores against the back of the middle plate have a parabolic profile consequences.
- the parabolic profile enables continuous operation without dead zones.
- the profile of the bores runs in a continuous and non-linear function, the first derivative of which is continuous.
- the profile of a parabola has proven to be preferred.
- transition of the holes from the middle plate to the back plate is stepless and is kink-free and represents the beginning of the profile which the holes follow.
- the profile of the pitch circle centers of the bores ends on the back of the center plate in such a way that the free pitch circle area of the bores is as small as possible, but preferably tends towards zero.
- the partial circular area is to be understood as the free cross-sectional area, which is a circle, minus the imaginary two circular partial areas, which is cut off by the rotation of a tooth of the two gear wheels in front of the cross-sectional area.
- Fig. 1 shows a section of a spinning pump with a
- Fig. 2 is a schematic view A-A on the
- Fig. 3 is a perspective view of the center plate.
- Fig. 4 shows a section B-B through the central plate with the holes according to the invention.
- Fig. 5 is a schematic representation of the inventive bore.
- the reference numeral 1 denotes a spinning block.
- the spinning pump is firmly connected via a pump protection plate 4.
- the essential parts consist of a back plate 5 and a middle plate 6.
- the end against a motor M is formed by a front plate 7.
- the front plate 7 usually includes a base plate.
- FIG. 2 shows a section A-A according to FIG. 1 through the front part of the central plate 6 of a gear pump.
- the gear wheels are designated by 8,8 '. They are arranged in bores 9.9 '.
- a bore 10 with a part-circular cross section is connected to the channel 2 and a bore 10 'is connected to the channel 3.
- the diameters of the channels 2 and 3 are the same as the diameters of the bores 10, 10 'of the center plate 6 to the back plate 5.
- the direction of rotation of the gear wheels is indicated by arrows.
- Fig. 3 the middle plate is shown in profile.
- the section shows a front 6 'and a rear 6' 1 of the center plate 6.
- An edge 12a and an edge 12b of the bore 10 meet at a point 11; the edges 12a 'and 12b' of the bore 10 'meet at a point 11'.
- Fig. 4 is a section B-B of Fig. 2. From the front 6 'of the central plate 6, the edge 12b and an edge 13, which meet at point 11; the edge 12b 'and an edge 13' meet at point 11 '.
- the parabola according to the invention is described by lines 13, 13 '.
- the course of the bore 10 is illustrated in the schematic illustration in FIG. 5.
- the radius r of the Pitch circle of the bore 10 remains constant over the entire length through the central plate 6.
- the parabolic shape of the bore 10 is described by the edge 13 and a partial circle center 13a, which come together on the back 6 ' 1 of the center plate 6 in point 11.
- a melt is pressed through the channel 2 of the bore 10 by means of extruder pressure.
- the melt is conveyed from the bore 10 through the bore 10 by the counter-rotation of the gears 8 and 8 '. From the bore 10 'the melt is increased. Pressure through the channel 3 a spinneret, not shown.
- the spinning pump according to the invention enables dead zone-free conveying and an increase in productivity of more than 10%. Deposits of cracked PA 6.6 are practically prevented.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH427/94 | 1994-02-14 | ||
CH42794 | 1994-02-14 | ||
PCT/CH1995/000029 WO1995022002A1 (de) | 1994-02-14 | 1995-02-07 | Spinnpumpe für polyamide |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0694126A1 true EP0694126A1 (de) | 1996-01-31 |
EP0694126B1 EP0694126B1 (de) | 1998-06-03 |
Family
ID=4186779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95906876A Expired - Lifetime EP0694126B1 (de) | 1994-02-14 | 1995-02-07 | Spinnpumpe für polyamide |
Country Status (7)
Country | Link |
---|---|
US (1) | US5618172A (de) |
EP (1) | EP0694126B1 (de) |
JP (1) | JP2961119B2 (de) |
CN (1) | CN1062645C (de) |
DE (1) | DE59502392D1 (de) |
ES (1) | ES2121344T3 (de) |
WO (1) | WO1995022002A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2195661T3 (es) * | 1998-10-01 | 2003-12-01 | Dow Global Technologies Inc | Bomba de engranajes para bombear fluidos de alta viscosidad. |
DE102009029522A1 (de) * | 2009-09-17 | 2011-03-24 | Robert Bosch Gmbh | Zahnradpumpe mit zwei rotierenden Pumpelementen |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE518993C (de) * | 1931-02-21 | Barmag Barmer Maschf | Einrichtung zum Druckausgleich fuer Kunstseide-Spinnpumpen | |
US2460649A (en) * | 1942-03-07 | 1949-02-01 | Geza W Muiler | Gear pump with flow cushioning means |
FR948868A (fr) * | 1947-06-24 | 1949-08-12 | Perfectionnement aux pompes à engrenages | |
DE1553125A1 (de) * | 1965-02-20 | 1970-04-30 | Maschf Augsburg Nuernberg Ag | Zahnradpumpe |
US3817668A (en) * | 1969-05-28 | 1974-06-18 | K Mayer | Gear wheel pump with feed passage of constant hydraulic cross section |
GB2169350B (en) * | 1985-01-05 | 1989-06-21 | Hepworth Plastics Ltd | Gear pumps |
JP2552857B2 (ja) * | 1987-04-06 | 1996-11-13 | カヤバ工業株式会社 | ギヤポンプ |
DE4007858C1 (en) * | 1990-03-13 | 1991-08-14 | Rhone-Poulenc Rhodia Ag, 7800 Freiburg, De | Rotary liquid pump - has pump coupled to block by symmetrically placed fastening screws |
-
1995
- 1995-02-07 DE DE59502392T patent/DE59502392D1/de not_active Expired - Fee Related
- 1995-02-07 EP EP95906876A patent/EP0694126B1/de not_active Expired - Lifetime
- 1995-02-07 ES ES95906876T patent/ES2121344T3/es not_active Expired - Lifetime
- 1995-02-07 US US08/532,556 patent/US5618172A/en not_active Expired - Lifetime
- 1995-02-07 JP JP7520884A patent/JP2961119B2/ja not_active Expired - Fee Related
- 1995-02-07 WO PCT/CH1995/000029 patent/WO1995022002A1/de active IP Right Grant
- 1995-02-07 CN CN95190087A patent/CN1062645C/zh not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9522002A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2961119B2 (ja) | 1999-10-12 |
JPH08510529A (ja) | 1996-11-05 |
EP0694126B1 (de) | 1998-06-03 |
CN1123049A (zh) | 1996-05-22 |
ES2121344T3 (es) | 1998-11-16 |
DE59502392D1 (de) | 1998-07-09 |
WO1995022002A1 (de) | 1995-08-17 |
CN1062645C (zh) | 2001-02-28 |
US5618172A (en) | 1997-04-08 |
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