EP0367845B1 - Liquid ring pump - Google Patents
Liquid ring pump Download PDFInfo
- Publication number
- EP0367845B1 EP0367845B1 EP88118520A EP88118520A EP0367845B1 EP 0367845 B1 EP0367845 B1 EP 0367845B1 EP 88118520 A EP88118520 A EP 88118520A EP 88118520 A EP88118520 A EP 88118520A EP 0367845 B1 EP0367845 B1 EP 0367845B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing cover
- pressure
- baffle
- liquid ring
- control disc
- 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.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 title claims description 22
- 238000010276 construction Methods 0.000 claims 1
- 229920002457 flexible plastic Polymers 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 210000002105 tongue Anatomy 0.000 description 1
Images
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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
- F04C29/068—Silencing the silencing means being arranged inside the pump housing
-
- 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
- F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
Definitions
- the invention relates to a liquid ring pump with a pump wheel rotatably mounted in its pump housing according to the preamble of claim 1.
- Such a liquid ring pump is known from EP-PS 0 138 182.
- a very disturbing, roaring noise occurs in particular at medium suction pressures, which penetrates to the outside via the pressure or outlet connection. This noise occurs at the outlet openings of the control disc, through which the gas enclosed and compressed in the blade cells of the pump wheel is pushed out rhythmically.
- a rotary piston compressor is known from US-A-4 636 154. So that there is no oil hammer between the outlet valve closing the outlet valve and the accumulated lubricating oil in such a compressor due to the lubricating oil introduced to lubricate the rolling piston and usually collects in the muffler connected to the outlet opening of the compressor, there is a drain opening in a housing wall of the muffler the oil provided. In order to guide the oil from the outlet opening to the corresponding housing wall, an axial wall projection having an oblique wall profile is provided following the outlet opening. From this wall protrusion, the oil reaches the housing wall and then exits the silencer via the outlet opening.
- the invention has for its object to design a liquid ring pump of the generic type so that the outward noise is significantly reduced.
- the object is achieved according to the invention by the features specified in the characterizing part of claim 1.
- the desired deflection of the operating fluid is achieved by the guide surfaces extending axially into the pressure chamber. This deflection of the operating fluid creates a finely distributed fluid curtain, which has a very sound-absorbing effect. This ensures that the pumped gas does not form a passage for the noise that is not satisfied with a sufficient liquid curtain.
- Undesired throttling losses of the compressed gas are kept small by deflecting the gas as little as possible.
- one guide surface is integrally formed on the wall of the housing cover and the further guide surface is attached to the housing cover as a separate component. This avoids undercuts, which increase the cost of manufacturing the housing cover using the casting process.
- a simple attachment of the further guide surface results from the insertion of this strip-shaped guide surface into holding slots which extend in the axial direction on the housing cover.
- This additional guide surface is clamped in the holding slots in that it consists of an elastic plastic strip, the length of which is slightly greater than the straight line distance between the base surfaces of the holding slots.
- the plastic strip must be arched somewhat as a result of this length dimension when it is inserted into the holding slots, so that it is pressed against the base surfaces of the holding slots by the resulting clamping force and is thus clamped in these.
- a control disk 5 is arranged between the pump housing 1 and a housing cover 6 which closes the pump housing 1 on this side.
- a suction and a pressure nozzle 7 and 8 are integrally formed on the housing cover 6.
- the suction nozzle 7 opens into a suction chamber 9 which is delimited by the housing cover 6 and the control disk 5.
- the opening 10 of the pressure nozzle 8 is connected to a pressure chamber 11 which is likewise delimited by the housing cover 6 and the control disk 5.
- the suction chamber 9 and the pressure chamber 11 are delimited in terms of pressure from one another by a center web 12 which is integrally formed on the housing cover 6 and, if appropriate, with the interposition of a sealing element on the control disk 5.
- the control disk 5 has at least one inlet and one outlet opening.
- the inlet opening 13 connected to the suction chamber 9 is shown in broken lines.
- the outlet bores 14 can be closed in a known manner by valves or covered by valve tongues.
- a guide surface 16 extending in the axial direction is formed on the inside of the wall 6a of the housing cover 6.
- a further guide surface 17 is designed as a separate component (for example elastic plastic strip) and is provided in the holding slots 19 and 20 provided on the central web 12 and on a holding web 18 which projects beyond a guide surface 16 in the axial direction plugged in.
- the further guide surface 17 is expediently designed as an elastic plastic strip and its axial length is somewhat larger than the straight-line distance between the base surfaces of the two holding slots 19 and 20 be bent. The resulting clamping force presses the side edges of the plastic strip against the bases of the holding slots 19 and 20, so that the plastic strip is held in its position by clamping action without further fasteners.
- the gas particles are deflected less because of their lower mass and thus less inertia and, since the two guide surfaces 16 and 17 do not overlap in the axial direction, can flow relatively straight past the guide surfaces 16 and 17 to the mouth opening 10. Your path is shown by a solid arrow 22.
- the liquid particles cross the path of the gas particles.
- a damping layer between the outlet bores 14 and the outlet slot 15 of the control disk 5 and the mouth opening 10 of the pressure port 8 is generated by the veil consisting of the liquid particles, which dampens the noise generated at the outlet bores 14 and the outlet slot 15 strongly.
- the damping measures require only minimal effort. Since the gas particles are deflected only slightly, there are no significant pressure losses.
Description
Die Erfindung betrifft eine Flüssigkeitsringpumpe mit einem in ihrem Pumpengehäuse drehbar gelagerten Pumpenrad gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a liquid ring pump with a pump wheel rotatably mounted in its pump housing according to the preamble of claim 1.
Eine solche Flüssigkeitsringpumpe ist durch die EP-PS 0 138 182 bekannt. Bei Flüssigkeitsringpumpen tritt insbesondere bei mittleren Ansaugdrücken ein sehr störendes, röhrendes Geräusch auf, das über den Druck- bzw. Auslaßstutzen nach außen dringt. Dieses Geräusch entsteht an den Auslaßöffnungen der Steuerscheibe, durch die das in den Schaufelzellen des Pumpenrades eingeschlossene und verdichtete Gas rhythmisch ausgeschoben wird.Such a liquid ring pump is known from EP-PS 0 138 182. In the case of liquid ring pumps, a very disturbing, roaring noise occurs in particular at medium suction pressures, which penetrates to the outside via the pressure or outlet connection. This noise occurs at the outlet openings of the control disc, through which the gas enclosed and compressed in the blade cells of the pump wheel is pushed out rhythmically.
Durch die US-A-4 636 154 ist ein Rollkolbenverdichter bekannt. Damit es bei einem solchen Verdichter durch das zur Schmierung des Rollkolbens eingebrachte und sich üblicherweise in dem der Auslaßöffnung des Verdichters nachgeschalteten Schalldämpfer sammelnde Schmieröl nicht zur Ölschlägen zwischen dem die Auslaßöffnung verschließenden Auslaßventil und dem angesammelten Schmieröl kommt, ist in einer Gehäusewand des Schalldämpfers eine Abflußöffnung für das Öl vorgesehen. Um das Öl von der Auslaßöffnung zu der entsprechenden Gehäusewand zu leiten, ist im Anschluß an die Auslaßöffnung ein einen schrägen Wandverlauf aufweisender axialer Wandvorsprung vorgesehen. Von diesem Wandvorsprung gelangt das Öl zu der Gehäusewand und tritt dann über die Auslaßöffnung aus dem Schalldämpfer aus.A rotary piston compressor is known from US-A-4 636 154. So that there is no oil hammer between the outlet valve closing the outlet valve and the accumulated lubricating oil in such a compressor due to the lubricating oil introduced to lubricate the rolling piston and usually collects in the muffler connected to the outlet opening of the compressor, there is a drain opening in a housing wall of the muffler the oil provided. In order to guide the oil from the outlet opening to the corresponding housing wall, an axial wall projection having an oblique wall profile is provided following the outlet opening. From this wall protrusion, the oil reaches the housing wall and then exits the silencer via the outlet opening.
Der Erfindung liegt die Aufgabe zugrunde, eine Flüssigkeitsringpumpe der gattungsgemäßen Art so auszubilden, daß das nach außen dringende Geräusch wesentlich reduziert wird.The invention has for its object to design a liquid ring pump of the generic type so that the outward noise is significantly reduced.
Die Lösung der gestellten Aufgabe gelingt nach der Erfindung durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale. Die gewünschte Umlenkung der Betriebsflüssigkeit wird durch die sich axial in den Druckraum erstreckende Leitflächen erreicht. Durch diese Umlenkung der Betriebsflüssigkeit wird ein fein verteilter Flüssigkeitsschleier erzeugt, der eine stark schalldämpfende Wirkung hat. Hierdurch wird gewährleistet, daß das geförderte Gas keinen Durchtrittsweg für das Geräusch bildet, der nicht mit einem ausreichenden Flüssigkeitsschleier erfüllt ist.The object is achieved according to the invention by the features specified in the characterizing part of claim 1. The desired deflection of the operating fluid is achieved by the guide surfaces extending axially into the pressure chamber. This deflection of the operating fluid creates a finely distributed fluid curtain, which has a very sound-absorbing effect. This ensures that the pumped gas does not form a passage for the noise that is not satisfied with a sufficient liquid curtain.
Unerwünschte Drosselverluste des verdichteten Gases werden dadurch klein gehalten, daß das Gas möglichst wenig umgelenkt wird.Undesired throttling losses of the compressed gas are kept small by deflecting the gas as little as possible.
Dies wird dadurch erreicht, daß die Leitfläche die Mündungsöffnung des Druckstutzens in axialer Richtung nur teilweise überdeckt bzw. daß sich bei der Anordnung von mehreren Leitflächen diese sich in axialer Richtung nicht überlappen, so daß noch ein möglichst geradliniger Weg zur Mündungsöffnung des Druckstutzens für die Gasteilchen verbleibt.This is achieved in that the guide surface only partially covers the opening of the pressure port in the axial direction or that when several guide surfaces are arranged, these do not overlap in the axial direction, so that the most straight possible path to the opening of the pressure port for the gas particles remains.
Fertigungstechnisch vorteilhaft ist es, wenn die eine Leitfläche an der Wand des Gehäusedeckels angeformt und die weitere Leitfläche als gesondertes Bauteil am Gehäusedeckel angebracht ist. Hierdurch werden Hinterschneidungen vermieden, die das Herstellen des Gehäusedeckels im Gießverfahren verteuern. Ein einfaches Anbringen der weiteren Leitfläche ergibt sich durch das Einstecken dieser streifenförmig ausgebildeten Leitfläche in sich in axialer Richtung am Gehäusedeckel erstreckende Halteschlitze. Dabei wird ein Festklemmen dieser weiteren Leitfläche in den Halteschlitzen dadurch erreicht, daß diese aus einem elastischen Kunststoffstreifen besteht, dessen Länge geringfügig größer als der geradlinige Abstand zwischen den Grundflächen der Halteschlitze ist. Der Kunststoffstreifen muß infolge dieser Längenbemessung beim Einschieben in die Halteschlitze etwas durchgewölbt werden, so daß er durch die dabei entstehende Spannkraft gegen die Grundflächen der Halteschlitze gepreßt und somit in diesen festgeklemmt wird.It is advantageous in terms of production technology if one guide surface is integrally formed on the wall of the housing cover and the further guide surface is attached to the housing cover as a separate component. This avoids undercuts, which increase the cost of manufacturing the housing cover using the casting process. A simple attachment of the further guide surface results from the insertion of this strip-shaped guide surface into holding slots which extend in the axial direction on the housing cover. This additional guide surface is clamped in the holding slots in that it consists of an elastic plastic strip, the length of which is slightly greater than the straight line distance between the base surfaces of the holding slots. The plastic strip must be arched somewhat as a result of this length dimension when it is inserted into the holding slots, so that it is pressed against the base surfaces of the holding slots by the resulting clamping force and is thus clamped in these.
Anhand eines in der Zeichnung dargestellten Ausführungsbeispieles wird der Anmeldungsgegenstand nachfolgend näher beschrieben. Es zeigt:
- FIG 1
- eine Flüssigkeitsringpumpe im Teillängsschnitt,
- FIG 2
- eine Draufsicht der der Steuerscheibe zugewandten Seite des Gehäusedeckels der Flüssigkeitsringpumpe.
- FIG. 1
- a liquid ring pump in partial longitudinal section,
- FIG 2
- a plan view of the side facing the control disc of the housing cover of the liquid ring pump.
Mit 1 ist das Pumpengehäuse einer Flüssigkeitsringpumpe bezeichnet, in dem ein mit Schaufeln 2 versehenes Pumpenrad 3 drehbar gelagert und über einen aus dem Pumpengehäuse 1 vorstehenden Wellenstummel 4 antreibbar ist. Auf der einen Stirnseite des Pumpengehäuses 1 ist eine Steuerscheibe 5 zwischen dem Pumpengehäuse 1 und einem das Pumpengehäuse 1 auf dieser Seite verschließenden Gehäusedeckel 6 angeordnet.1 designates the pump housing of a liquid ring pump in which a pump wheel 3 provided with blades 2 is rotatably mounted and can be driven via a shaft stub 4 protruding from the pump housing 1. On one end of the pump housing 1, a control disk 5 is arranged between the pump housing 1 and a
An dem Gehäusedeckel 6 sind ein Saug- und ein Druckstutzen 7 und 8 angeformt. Der Saugstutzen 7 mündet in einen von dem Gehäusedeckel 6 und der Steuerscheibe 5 umgrenzten Saugraum 9. Die Mündungsöffnung 10 des Druckstutzens 8 steht mit einem ebenfalls vom Gehäusedeckel 6 und der Steuerscheibe 5 umgrenzten Druckraum 11 in Verbindung. Der Saugraum 9 und der Druckraum 11 sind durch einen am Gehäusedeckel 6 angeformten und gegebenenfalls unter Zwischenfügung eines Dichtelementes an der Steuerscheibe 5 anliegenden Mittelsteg 12 druckmäßig gegeneinander abgegrenzt.A suction and a pressure nozzle 7 and 8 are integrally formed on the
Die Steuerscheibe 5 weist bekanntlich jeweils mindestens eine Einlaß- und eine Auslaßöffnung auf. In der FIG 2 ist die mit dem Saugraum 9 in Verbindung stehende Einlaßöffnung 13 gestrichelt dargestellt. Die in mehrere Auslaßbohrungen 14 und einen Auslaßschlitz 15 unterteilte und mit dem Druckraum 11 in Verbindung stehende Auslaßöffnung ist ebenfalls gestrichelt im Bereich des Druckraumes 11 eingezeichnet. Die Auslaßbohrungen 14 können in bekannter Weise durch Ventile verschlossen oder durch Ventilzungen abgedeckt sein.As is known, the control disk 5 has at least one inlet and one outlet opening. In FIG. 2, the inlet opening 13 connected to the suction chamber 9 is shown in broken lines. The outlet opening, which is subdivided into a plurality of outlet bores 14 and an
An der Innenseite der Wand 6a des Gehäusedeckels 6 ist eine sich in axialer Richtung erstreckende Leitfläche 16 angeformt. Eine weitere Leitfläche 17 ist als gesondertes Bauteil (z.B. elastischer Kunststoffstreifen) ausgebildet und in am Mittelsteg 12 und an einem die eine Leitfläche 16 in axialer Richtung überragenden Haltesteg 18 vorgesehene Halteschlitze 19 und 20 eingesteckt. Die weitere Leitfläche 17 ist zweckmäßiger Weise als elastischer Kunststoffstreifen ausgebildet und in ihrer axialen Länge etwas größer bemessen als der geradlinige Abstand zwischen den Grundflächen der beiden Halteschlitze 19 und 20. Somit muß der die weitere Leitfläche bildende Kunststoffstreifen beim Einsetzen in die Halteschlitze 19 und 20 entsprechend durchgebogen werden. Die durch das Durchbiegen entstehende Spannkraft preßt die Seitenkanten des Kunststoffstreifens gegen die Grundflächen der Halteschlitze 19 und 20, so daß der Kunststoffstreifen ohne weitere Befestigungsmittel in seiner Lage durch Klemmwirkung gehalten ist.A
Während des Betriebes der Flüssigkeitsringpumpe wird zusammen mit dem in den Schaufelzellen verdichteten Gas auch ein Teil der Betriebsflüssigkeit durch die Auslaßbohrungen 14 und den Auslaßschlitz 15 ausgestoßen. Dieses Gas-Flüssigkeits-Gemisch durchströmt den Druckraum 11 zur Mündungsöffnung 10 des Druckstutzens 8 hin. Dabei wird das Gemisch zunächst an der weiteren Leitfläche 17, die gegenüber der am Gehäusedeckel 6 angeformten Leitfläche 16 radial weiter innen liegt, abgelenkt. Die Flüssigkeitsteilchen behalten dabei wegen ihrer größeren Massenträgheit gegenüber den Gasteilchen ihre axial gerichtete Ablenkrichtung bei, bis sie an der Wand 6a des Gehäusedeckels 6 wieder in radialer Richtung und anschließend durch die Leitfläche 16 wieder in axialer Richtung umgelenkt werden und schließlich über die Mündungsöffnung 10 in den Druckstutzen 8 gelangen. Der Weg der Flüssigkeitsteilchen ist durch einen gestrichelt gezeichneten Pfeil 21 dargestellt.During the operation of the liquid ring pump, together with the gas compressed in the blade cells, part of the operating liquid is also expelled through the outlet bores 14 and the
Die Gasteilchen werden wegen ihrer geringeren Masse und damit geringeren Trägheit weniger stark abgelenkt und können, da sich die beiden Leitflächen 16 und 17 in axialer Richtung nicht überlappen, relativ geradlinig an den Leitflächen 16 und 17 vorbei zur Mündungsöffnung 10 strömen. Ihr Weg ist durch einen ausgezogenen Pfeil 22 dargestellt.The gas particles are deflected less because of their lower mass and thus less inertia and, since the two
Wie aus dieser Darstellung zu erkennen ist, kreuzen die Flüssigkeitsteilchen den Weg der Gasteilchen. Somit wird durch den aus den Flüssigkeitsteilchen bestehenden Schleier eine Dämpfungsschicht zwischen den Auslaßbohrungen 14 und dem Auslaßschlitz 15 der Steuerscheibe 5 und der Mündungsöffnung 10 des Druckstutzens 8 erzeugt, die die an den Auslaßbohrungen 14 und dem Auslaßschlitz 15 entstehenden Geräusche stark dämpft. Die Dämpfungsmaßnahmen erfordern dabei nur einen minimalen Aufwand. Da die Gasteilchen nur wenig umgelenkt werden, ergeben sich keine ins Gewicht fallenden Druckverluste.As can be seen from this illustration, the liquid particles cross the path of the gas particles. Thus, a damping layer between the outlet bores 14 and the
Claims (5)
- Liquid ring pump having a pump impeller rotatably mounted in its pump housing, in which pump there is arranged, on at least one face between the pump housing (1) and a housing cover (6) provided with an intake-and pressure-connection (7 and 8), a control disc (5) which has at least one inlet and one outlet aperture (13 or 14, 15), the inlet aperture (13) being arranged on the control disc (5) in the region of an intake chamber (9) formed between the housing cover (6) and the control disc (5) and connected to the intake connection (7), and the outlet aperture (14, 15) being arranged on the control disc (5) in the region of a pressure chamber (11) also formed between the housing cover (6) and the control disc (5), connected to the pressure connection (8) and pressure-wise demarcated with respect to the intake chamber (9), characterised in that the portion of the operating liquid expelled together with the compressed gas is guided along its path through the pressure chamber (11) by at least one baffle (16) which is provided on the stretch from the outlet aperture (14, 15) to the outlet opening (10) of the pressure connection (8) on the housing cover (6) and partially covering the outlet opening (10) in the axial direction transversely to the flow direction (arrow 22) of the gas also flowing through the pressure chamber (11) to the pressure connection (8).
- Liquid ring pump according to claim 1,
characterised in that a further baffle (17) is provided, the two baffles (16 and 17) being arranged in the pressure chamber (11) opposite each other at a radial separation, and not overlapping in the axial direction. - Liquid ring pump according to claim 2,
characterised in that the one baffle (16) is formed on the wall (6a) of the housing cover (6) and the other baffle (17), arranged on the side of the housing cover (6) adjacent to the control disc (5), is fitted as a separate component on the housing cover (6). - Liquid ring pump according to claim 3,
characterised in that the other baffle (17) is of strip-shaped construction and can be inserted into retaining slits (19 and 20) extending in the axial direction on the housing cover (6). - Liquid ring pump acccording to claim 4,
characterised in that the other baffle (17) is constructed as a flexible plastics strip whose length is slightly greater than the rectilinear distance between the surfaces of the retaining slits (19 and 20).
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8888118520T DE3867068D1 (en) | 1988-11-07 | 1988-11-07 | LIQUID RING PUMP. |
| EP88118520A EP0367845B1 (en) | 1988-11-07 | 1988-11-07 | Liquid ring pump |
| US07/429,765 US4992028A (en) | 1988-11-07 | 1989-10-31 | Liquid ring pump |
| JP1989127205U JPH0264782U (en) | 1988-11-07 | 1989-11-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP88118520A EP0367845B1 (en) | 1988-11-07 | 1988-11-07 | Liquid ring pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0367845A1 EP0367845A1 (en) | 1990-05-16 |
| EP0367845B1 true EP0367845B1 (en) | 1991-12-18 |
Family
ID=8199534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88118520A Expired - Lifetime EP0367845B1 (en) | 1988-11-07 | 1988-11-07 | Liquid ring pump |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4992028A (en) |
| EP (1) | EP0367845B1 (en) |
| JP (1) | JPH0264782U (en) |
| DE (1) | DE3867068D1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE119628T1 (en) * | 1991-12-17 | 1995-03-15 | Siemens Ag | LIQUID RING PUMP. |
| DE29803768U1 (en) * | 1998-03-04 | 1998-06-10 | Siemens Ag | Liquid ring pump |
| US6405748B1 (en) | 1999-03-22 | 2002-06-18 | David Muhs | Trailer and fuel tank assembly |
| US6315524B1 (en) | 1999-03-22 | 2001-11-13 | David Muhs | Pump system with vacuum source |
| US6390768B1 (en) | 1999-03-22 | 2002-05-21 | David Muhs | Pump impeller and related components |
| US6692234B2 (en) * | 1999-03-22 | 2004-02-17 | Water Management Systems | Pump system with vacuum source |
| US6641369B2 (en) * | 1999-05-19 | 2003-11-04 | Robuschi & C. S.P.A. | Liquid ring compressor with thin distribution plate |
| CN1118631C (en) * | 2000-03-01 | 2003-08-20 | 倪春堂 | Rotary piston pump |
| ES2271420T3 (en) * | 2003-05-16 | 2007-04-16 | Sterling Fluid Systems (Germany) Gmbh | HYDRORROTATIVE GAS PUMP. |
| US7878768B2 (en) | 2007-01-19 | 2011-02-01 | David Muhs | Vacuum pump with wear adjustment |
| US8998586B2 (en) * | 2009-08-24 | 2015-04-07 | David Muhs | Self priming pump assembly with a direct drive vacuum pump |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1897199A (en) * | 1931-03-30 | 1933-02-14 | Grigsby Grunow Co | Compressor |
| US3180449A (en) * | 1963-01-28 | 1965-04-27 | Ingersoll Rand Co | Noise abatement snubber for vacuum pump system |
| DE2318538B2 (en) * | 1973-04-12 | 1975-12-04 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Distributor for a liquid ring gas compressor |
| DE3337837A1 (en) * | 1983-10-18 | 1985-04-25 | Siemens AG, 1000 Berlin und 8000 München | LIQUID RING PUMP |
| JPH0742937B2 (en) * | 1984-06-04 | 1995-05-15 | 株式会社日立製作所 | Horizontal rotary compressor |
| DE3421866A1 (en) * | 1984-06-13 | 1985-12-19 | Sihi Gmbh & Co Kg, 2210 Itzehoe | LIQUID RING COMPRESSOR UNIT |
| US4755107A (en) * | 1986-05-14 | 1988-07-05 | Siemens Aktiengesellschaft | Liquid-ring pump having additional openings in control disc for warm and cold liquid |
-
1988
- 1988-11-07 EP EP88118520A patent/EP0367845B1/en not_active Expired - Lifetime
- 1988-11-07 DE DE8888118520T patent/DE3867068D1/en not_active Expired - Lifetime
-
1989
- 1989-10-31 US US07/429,765 patent/US4992028A/en not_active Expired - Lifetime
- 1989-11-01 JP JP1989127205U patent/JPH0264782U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0264782U (en) | 1990-05-15 |
| EP0367845A1 (en) | 1990-05-16 |
| US4992028A (en) | 1991-02-12 |
| DE3867068D1 (en) | 1992-01-30 |
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