CH562964A5 - Centrifugal pump with flow deflecting rim - suitable for central heating plant, cavitation noise is almost eliminated - Google Patents
Centrifugal pump with flow deflecting rim - suitable for central heating plant, cavitation noise is almost eliminatedInfo
- Publication number
- CH562964A5 CH562964A5 CH421873A CH421873A CH562964A5 CH 562964 A5 CH562964 A5 CH 562964A5 CH 421873 A CH421873 A CH 421873A CH 421873 A CH421873 A CH 421873A CH 562964 A5 CH562964 A5 CH 562964A5
- Authority
- CH
- Switzerland
- Prior art keywords
- impeller
- centrifugal pump
- flow
- pump according
- pump
- Prior art date
Links
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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2272—Rotors specially for centrifugal pumps with special measures for influencing flow or boundary layer
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
At the circumference of the pump rotor (9) or on the pump housing surrounding the rotor, a rim (11) is provided which deflects the flow of fluid axially. The transfer of velocity-head to pressure-head in the pump is achieved within the pump rotor and during the flow past the deflecting rim. The pump medium leaves the pump without local pressure fluctuations which are usually the cause of pump noise. The rim round the rotor overlaps the rotor outlet completely or partially. The edge of the rim is parallel to the centreline of the rotor.
Description
Bei den bekannten Zentrifugalpumpen, insbesondere Umwälzpumpen von Zentralheizungen, macht sich jede Geräuschbildung während des Laufes unangenehm bemerkbar, da sie insbesondere während der Nachtzeit auffällig wird.
Die vorliegende Erfindung bezweckt, diesen Übelstand zu vermindern. Die erfindungsgemässe Zentrifugalpumpe kennzeichnet sich dadurch aus, dass am Radumfang oder am Gehäuse im Bereich des Radumfanges strömungsablenkende Mittel vorgesehen sind.
Ein Ausführungsbeispiel des Erfindungsgegenstandes wird anschliessend anhand einer Figur erläutert, welche eine Zentrifugalpumpe im Längsschnitt darstellt.
Das Pumpengehäuse 1 ist mit einem Zulaufstutzen 2, einem Laufrad 3 sowie einem Druckstutzen 4 ausgerüstet. Das Laufrad 3 ist mit Laufschaufeln 5 versehen, welche mitsamt einer Laufscheibe 9 und einer Deckscheibe Schaufelkanäle 7 festlegen. Diese Laufradscheibe 9 ist an ihrem äusseren Ende mit einem glockenförmigen Rand 11 versehen, welcher die aus den Schaufelkanälen 7 austretenden Ströme in Richtung gegen die Ansaugseite hin ablenkt. Das freie Ende des Randes verläuft praktisch parallel zur Pumpenradachse. Zum Antreiben des Laufrades 3 ist ein Antriebsmotor 13 mit einer Welle 15 vorgesehen.
Es ist auch möglich, derartige Ablenkmittel am Gehäuse anzubringen und sie entsprechend im Bereich des Laufradumfanges in die Schaufelkanalströmung vorstehen zu lassen.
Es handelt sich bei diesen Ablenkmitteln um solche, welche die Strömung insbesondere in axialer Richtung ablenken.
Dabei wird vermutlich die Umsetzung von Geschwindigkeitsin Druckenergie innerhalb des Pumpenrades und der Ablenkmittel vollzogen. Das Strömungsmedium verlässt den rotierenden Teil der Pumpe ohne örtliche Druckschwankungen, welche als Hauptursache des pfeifenden Geräusches angesehen werden.
PATENTANSPRUCH
Zentrifugalpumpe, dadurch gekennzeichnet, dass am Radumfang oder am Gehäuse im Bereich des Radumfanges strömungsablenkende Mittel vorgesehen sind.
UNTERANSPRÜCHE
1. Zentrifugalpumpe nach Patentanspruch, dadurch gekennzeichnet, dass die Mittel als in die Strömung aus den Schaufeln vorstehender, z. B. auf seinem ganzen Umfang geschlossener, glockenförmiger Rand ausgebildet sind.
2. Zentrifugalpumpe nach Unteranspruch 1, dadurch gekennzeichnet, dass der Rand als Fortsetzung des Laufrad Wandkörpers ausgebildet ist.
3. Zentrifugalpumpe nach Patentanspruch, dadurch gekennzeichnet, dass sich die Mittel, insbesondere als Teil des Laufrades, in Richtung gegen die Einlaufseite der Pumpe hin erstrekken.
4. Zentrifugalpumpe nach Patentanspruch, dadurch gekennzeichnet, dass die Mittel die Austritts-Schaufelkanäle mindestens teilweise, insbesondere vollständig überdecken.
5. Zentrifugalpumpe nach Unteranspruch 1, dadurch gekennzeichnet, dass der Bereich des Randendes mindestens annähernd parallel zur Laufradachse verläuft.
**WARNUNG** Ende DESC Feld konnte Anfang CLMS uberlappen**.
With the known centrifugal pumps, in particular circulation pumps for central heating systems, any noise formation during operation makes itself unpleasantly noticeable, since it is particularly noticeable during the night.
The present invention aims to alleviate this drawback. The centrifugal pump according to the invention is characterized in that flow-deflecting means are provided on the wheel circumference or on the housing in the area of the wheel circumference.
An exemplary embodiment of the subject matter of the invention will then be explained using a figure which shows a centrifugal pump in longitudinal section.
The pump housing 1 is equipped with an inlet connection 2, an impeller 3 and a pressure connection 4. The impeller 3 is provided with rotor blades 5 which, together with a rotor disk 9 and a cover disk, define blade channels 7. This impeller disk 9 is provided at its outer end with a bell-shaped edge 11 which deflects the flows emerging from the blade channels 7 in the direction towards the suction side. The free end of the edge runs practically parallel to the pump wheel axis. A drive motor 13 with a shaft 15 is provided for driving the impeller 3.
It is also possible to attach such deflection means to the housing and to have them protrude into the blade channel flow in the area of the impeller circumference.
These deflection means are those which deflect the flow, in particular in the axial direction.
In doing so, the conversion of speed into pressure energy is presumably carried out within the impeller and the deflection means. The flow medium leaves the rotating part of the pump without local pressure fluctuations, which are considered to be the main cause of the whistling noise.
PATENT CLAIM
Centrifugal pump, characterized in that flow deflecting means are provided on the wheel circumference or on the housing in the area of the wheel circumference.
SUBCLAIMS
1. Centrifugal pump according to claim, characterized in that the means as protruding into the flow from the blades, for. B. are formed on its entire circumference closed, bell-shaped edge.
2. Centrifugal pump according to dependent claim 1, characterized in that the edge is designed as a continuation of the impeller wall body.
3. Centrifugal pump according to claim, characterized in that the means, in particular as part of the impeller, extend in the direction towards the inlet side of the pump.
4. Centrifugal pump according to claim, characterized in that the means at least partially, in particular completely, cover the outlet vane channels.
5. Centrifugal pump according to dependent claim 1, characterized in that the region of the edge end extends at least approximately parallel to the impeller axis.
** WARNING ** End of DESC field could overlap beginning of CLMS **.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH421873A CH562964A5 (en) | 1973-03-23 | 1973-03-23 | Centrifugal pump with flow deflecting rim - suitable for central heating plant, cavitation noise is almost eliminated |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH421873A CH562964A5 (en) | 1973-03-23 | 1973-03-23 | Centrifugal pump with flow deflecting rim - suitable for central heating plant, cavitation noise is almost eliminated |
Publications (1)
Publication Number | Publication Date |
---|---|
CH562964A5 true CH562964A5 (en) | 1975-06-13 |
Family
ID=4271999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH421873A CH562964A5 (en) | 1973-03-23 | 1973-03-23 | Centrifugal pump with flow deflecting rim - suitable for central heating plant, cavitation noise is almost eliminated |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH562964A5 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0870928A1 (en) * | 1997-04-10 | 1998-10-14 | Whirlpool Corporation | Circulating centrifugal pump for a diswasher |
FR3007086A1 (en) * | 2013-06-18 | 2014-12-19 | Cryostar Sas | CENTRIFUGAL WHEEL |
-
1973
- 1973-03-23 CH CH421873A patent/CH562964A5/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0870928A1 (en) * | 1997-04-10 | 1998-10-14 | Whirlpool Corporation | Circulating centrifugal pump for a diswasher |
FR3007086A1 (en) * | 2013-06-18 | 2014-12-19 | Cryostar Sas | CENTRIFUGAL WHEEL |
WO2014202903A1 (en) * | 2013-06-18 | 2014-12-24 | Cryostar Sas | Centrifugal rotor |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PL | Patent ceased |