EP1079115A2 - Pumpengehäuse aus Kunststoff - Google Patents
Pumpengehäuse aus Kunststoff Download PDFInfo
- Publication number
- EP1079115A2 EP1079115A2 EP00116683A EP00116683A EP1079115A2 EP 1079115 A2 EP1079115 A2 EP 1079115A2 EP 00116683 A EP00116683 A EP 00116683A EP 00116683 A EP00116683 A EP 00116683A EP 1079115 A2 EP1079115 A2 EP 1079115A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal pump
- pump according
- housing
- pump housing
- inlet
- 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
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
- F05D2300/433—Polyamides, e.g. NYLON
Definitions
- the present invention relates to a centrifugal pump operated by an electric motor for conveying process water in building supply systems, with a motor housing surrounding the electric motor and with a pump housing which covers an impeller chamber which accommodates the impeller on the end face and which has an inlet channel which opens into an inlet connection, and which has an outlet channel which is in particular coaxial ( in-line ”) to the outlet port arranged outlet port.
- Centrifugal pumps with such pump housings have been around for a long time well known.
- high pressures with pressure peaks of up to 30 bar to be able to withstand the pump housings of these pumps known to be made of corrosion-resistant metal in particular cast from a special copper alloy.
- Such cast or pressed metal housing with molded nozzle for connection to the pipelines are resistant and also guarantee high operational reliability of the pumps with the high pressures that occur in service water circuits.
- a disadvantage of the known domestic water pumps with pump housings is made of metal that the housing because of the high Material costs and because of the complex manufacturing process are comparatively expensive. Thats how it is suppost to be cast or pressed metal housing with cutting Processes, for example by drilling, milling or turning, to be reworked to its final form. In addition to the Material costs thus burden the manufacturing costs Pump price.
- the object of the present invention is no longer one for suitable centrifugal pump for use in service water systems create, the pump housing is inexpensive and at simple manufacturing, great resistance to has high pressures and pressure peaks.
- the one-piece plastic pump housing has first of all the great advantage that it is compared to the previously known metal housings because of the cheaper material and because of the simpler manufacturing process is cheaper. In particular, in the manufacture completely without machining become.
- the entire pump housing can be used according to the invention all the ducting in it in just one Spraying process can be made. It is injection mold required advantageously designed so that the pump housing with only a single injection point is injected. A particularly high strength of the Pump housing and thus a great reliability of the Centrifugal pump can be reached.
- the housing according to the invention is particularly light and yet suitable in service water pumps to be used and the pressure peaks that occur withstand up to 30 bar.
- this Pump housing a cylindrical covering the impeller chamber Cover part, which is surrounded by an external thread and the to hold the pump housing in a corresponding on Motor housing internal thread is screwed.
- This type of connection is particularly stable and contributes to Increase the strength of the pump.
- the thread can be in particular with about 67 mm outer diameter and about 2.5 mm Dimension the slope so that the pump housing in the previously used motor housing is screwable. Consequently the pumps on the market can be easily retrofit with the plastic housing according to the invention.
- the front especially the cover with the direct molded connection piece, with star-shaped arrangement Stiffening ribs provided that the inlet channel and Hold the outlet duct at least up to the height of its axis.
- Stiffening ribs create an additional connection between the channels on the one hand and the lid-shaped pump housing or the cover part on the other. They improve the Stability of the pump housing.
- the stiffening ribs are as stated, aligned radially or in a star shape and cover the housing or the cover part like a dome Inclusion of the molded channels.
- the injection mold designed so that the only injection point on one of the Line channels, especially on the outer wall of the inlet channel is arranged approximately in the center of the pump housing.
- the plastic is distributed during injection almost evenly in a flow direction from the injection point over the reinforcement ribs to the bottom of the housing, without weld lines.
- weld lines occur there where two plastics flow during the spraying process meet. They form weaknesses because of themselves the fibers present in the plastic do not meet these joints interweave, only the plastic flows into each other or the surfaces of the plastic baked together.
- the weld lines form zones less Resilience.
- the webs or ribs formed on the housing thus have on the one hand the purpose of reinforcing and serving the housing on the other hand as lead structures that have a homogeneous distribution ensure the plastic in the injection mold. Because of of the homogeneous flow process in a preferred direction Avoid weld lines and there is a resistant Pump housing from a single source.
- the foot of the inlet duct with the foot of the outlet duct connects and which is almost at the height of the inner diameter on the Outer wall of the outlet channel opens. So the plastic can run directly into the pressure port from the injection point.
- the raised rib offers a special stiffening in the axial direction of the nozzle and thus increases the stability of the pump housing.
- the fiber content can be made of glass or Carbon fibers exist. These plastics stand out through a particularly high strength and rigidity low toughness. They can reach temperatures of up to endured to 240 ° Celsius and also has a high resistance against aggressive chemicals.
- Out Pump housing made of fiber-reinforced plastic can be designed so that they can handle the pressures in question easily withstand.
- connection piece on the outer edge surrounded with a reinforcement ring that is in a special advantageous embodiment made of metal and on the outer circumference of a nozzle is pressed.
- the piping can have internal threads that are located inside the connecting piece, on the pump housing be connected.
- the seal between the Pipelines and the pump housing can be known Way done by sealing material in the screw.
- the internal thread in the connecting piece ensures that previously used in such centrifugal pumps Connection standard can be maintained.
- the support ring serves to absorb tensions within the Connection thread arise.
- the figure shows a pump housing 1 made of a fiber-reinforced Plastic, especially a polyphenylene sulfide is injected.
- the pump housing is on the motor housing one not shown operated by an electric motor Domestic water pump attachable. It covers the impeller the impeller chamber accommodating the centrifugal pump on the front.
- the pump housing 1 has one surrounded by the housing wall Inlet channel 2, which opens into an inlet port 3. about the inlet channel 2 becomes the pump medium in the direction of arrow A central suction mouth of the impeller, not shown.
- the pumping medium conveyed to the outside by the rotating impeller enters an outlet channel 4, which in known Way opens into an outlet 5.
- the entire pump housing is as shown in the figure, from one piece manufactured.
- the inlet connection 3 and the outlet connection 5 are located inline on the axis 6, which is perpendicular to the axis of rotation 7 of the Impeller is arranged.
- Both the collar of the inlet nozzle 3 and the collar the outlet nozzle 5 are of a support ring 8 made of metal surrounded by an additional stability of the screw connection between the pipeline, not shown, and the Trim causes. Point for screwing in the pipes the connecting pieces 3 and 5 have an internal thread 9.
- the pump housing 1 has a cylindrical, the impeller chamber covering cover part 10, to which the nozzle with formed their walls 11 forming the channels 2 and 4 are.
- the walls 11 are arranged radially Stiffening ribs 12 connected to the cover part 10.
- the injection point 13 is approximately centrally on the wall 11 of the inlet channel 3. Zur special stiffening of the pump housing in the axial direction a raised rib 16 is provided.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims (12)
- Von einem Elektromotor betriebene Kreiselpumpe zur Förderung von Brauchwasser in Versorgungssystemen von Gebäuden, mit einem den Elektromotor umgebenden Motorgehäuse und mit einem Pumpengehäuse, das eine das Laufrad aufnehmende Laufradkammer stirnseitig bedeckt und das einen Einlaßkanal aufweist, der in einem Einlaßstutzen mündet, und das einen Auslaßkanal aufweist, der in einem koaxial (in-line") zum Einlaßstutzen angeordneten Auslaßstutzen mündet,
dadurch gekennzeichnet, daß das Pumpengehäuse (1) einstückig aus Kunststoff gefertigt ist. - Kreiselpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß das Pumpengehäuse (1) ein Spritzgießteil mit einem einzigen Anspritzpunkt (13) ist. - Kreiselpumpe nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß das Pumpengehäuse (1) ein zylindrisches die Laufradkammer abdeckendes Abdeckteil (10) aufweist, das von einem Außengewinde (14) umgeben ist und das zur Halterung des Pumpengehäuses in ein am Motorgehäuse befindliches Innengewinde einschraubbar ist. - Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß die Stirnseite Pumpengehäuses, insbesondere des Abdeckteiles (10) mit sternförmig angeordneten Versteifungsrippen (12) versehen ist, die den Einlaßkanal und den Auslaßkanal zumindest bis in Höhe ihrer Achse einfassen. - Kreiselpumpe nach Anspruch 4,
gekennzeichnet durch eine erhabene Verbindungsrippe (16), die den Fuß des Einlaßkanales mit dem Fuß des Auslaßkanales verbindet und die nahezu in Höhe des Innendurchmessers an der Außenwandung des Auslaßkanales mündet. - Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß der Einlaßstutzen (3) und der Auslaßstutzen (5) von einem insbesondere aus Metall geformten Stützring (8) umgeben sind. - Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß der Kunststoff einen Anteil von insbesondere 20% - 30% Glas und/oder Kohlefasern aufweist. - Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß der Kunststoff ein Polyamid (PA) oder ein Polyphenylensulfid (PPS) ist. - Kreiselpumpe nach einem der vorherigen Ansprüche,
gekennzeichnet durch ein Spaltrohr, das den Rotor vom Stator hydraulisch trennt. - Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß der Anspritzpunkt (13) sich an der Oberfläche des Einlasstutzens (3) oder der Wandungen (2) des Einlaßkanales befindet. - Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß der Einlaßkanal beim Spritzen des Pumpengehäuses von zwei senkrecht aufeinanderstoßenden Kernen geformt wird. - Kreiselpumpe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß in das zylindrische Abdeckteil (10) ein profilierter Dichtring (15), insbesondere ein O-Ring, in eine entsprechend dafür vorgesehene Nut eingelegt ist, der das Pumpengehäuse (1) gegenüber dem Motorgehäuse abdichtet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19940146 | 1999-08-24 | ||
DE19940146 | 1999-08-24 |
Publications (4)
Publication Number | Publication Date |
---|---|
EP1079115A2 true EP1079115A2 (de) | 2001-02-28 |
EP1079115A3 EP1079115A3 (de) | 2001-04-18 |
EP1079115B1 EP1079115B1 (de) | 2005-11-30 |
EP1079115B2 EP1079115B2 (de) | 2013-04-24 |
Family
ID=7919453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00116683.4A Expired - Lifetime EP1079115B2 (de) | 1999-08-24 | 2000-08-02 | Pumpengehäuse aus Kunststoff |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1079115B2 (de) |
DE (1) | DE50011736D1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002036404A1 (de) * | 2000-11-02 | 2002-05-10 | Lucas Automotive Gmbh | Unterdruck-bremskraftverstärker |
EP2236839A1 (de) | 2009-04-04 | 2010-10-06 | Grundfos Management A/S | Kreiselpumpenaggregat |
US9624945B2 (en) | 2013-06-13 | 2017-04-18 | Johnson Electric S.A. | Circulation pump |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL299318A (de) * | 1900-01-01 | |||
GB1526940A (en) * | 1975-12-18 | 1978-10-04 | British Gas Corp | Centrifugal liquid pumps |
DE3011888A1 (de) * | 1980-03-27 | 1981-10-01 | Richard 7066 Baltmannsweiler Halm | Kreiselpumpe |
DE3813654A1 (de) * | 1988-04-22 | 1989-11-02 | Licentia Gmbh | Umwaelzpumpe |
EP0919727A1 (de) * | 1997-11-28 | 1999-06-02 | WILO GmbH | Motorkreiselpumpe |
-
2000
- 2000-08-02 DE DE50011736T patent/DE50011736D1/de not_active Expired - Lifetime
- 2000-08-02 EP EP00116683.4A patent/EP1079115B2/de not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL299318A (de) * | 1900-01-01 | |||
GB1526940A (en) * | 1975-12-18 | 1978-10-04 | British Gas Corp | Centrifugal liquid pumps |
DE3011888A1 (de) * | 1980-03-27 | 1981-10-01 | Richard 7066 Baltmannsweiler Halm | Kreiselpumpe |
DE3813654A1 (de) * | 1988-04-22 | 1989-11-02 | Licentia Gmbh | Umwaelzpumpe |
EP0919727A1 (de) * | 1997-11-28 | 1999-06-02 | WILO GmbH | Motorkreiselpumpe |
Non-Patent Citations (1)
Title |
---|
BUSE F W: "NON-METALLIC PUMPS" , WORLD PUMPS,GB,TRADE AND TECHNICAL PRESS LTD. MORDEN, NR. 5, PAGE(S) 142-145 XP000084075 ISSN: 0262-1762 * das ganze Dokument * * Tabelle 1 * * Seite 1, Spalte 3, Zeile 2 - Zeile 27 * * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002036404A1 (de) * | 2000-11-02 | 2002-05-10 | Lucas Automotive Gmbh | Unterdruck-bremskraftverstärker |
EP2236839A1 (de) | 2009-04-04 | 2010-10-06 | Grundfos Management A/S | Kreiselpumpenaggregat |
US9624945B2 (en) | 2013-06-13 | 2017-04-18 | Johnson Electric S.A. | Circulation pump |
Also Published As
Publication number | Publication date |
---|---|
DE50011736D1 (de) | 2006-01-05 |
EP1079115B2 (de) | 2013-04-24 |
EP1079115A3 (de) | 2001-04-18 |
EP1079115B1 (de) | 2005-11-30 |
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