EP0841482A2 - Drehkolbenpumpe - Google Patents
Drehkolbenpumpe Download PDFInfo
- Publication number
- EP0841482A2 EP0841482A2 EP97119676A EP97119676A EP0841482A2 EP 0841482 A2 EP0841482 A2 EP 0841482A2 EP 97119676 A EP97119676 A EP 97119676A EP 97119676 A EP97119676 A EP 97119676A EP 0841482 A2 EP0841482 A2 EP 0841482A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- shafts
- rotary
- pump according
- rotary lobe
- lobe pump
- 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
- 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
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
Definitions
- the invention relates to a rotary lobe pump with a pump housing, in which two counter-rotating rotating pistons on two parallel, spaced shafts are held, the shafts from the pump housing led out and stored with their end portions in a gearbox.
- Rotary lobe pumps of this type which in the two-bladed design are also used as Roots blowers or Roots pumps are available in different designs for a variety of applications Media in use.
- the invention is mainly aimed at applications in Agricultural engineering soeie in adjacent areas, can of course also in other areas such as the food industry.
- two bearings are provided on both sides of the pump housing for receiving the shafts carrying the rotary lobes, the shafts being led out of the pump housing on one side.
- the pistons are driven via a gear unit to be attached to another relevant side of the pump housing, which essentially consisted of a meshing gear pair on the shaft sections made from the pump housing and a respective bearing for the shafts.
- the object of the invention is to provide a rotary lobe pump in which the disadvantages mentioned no longer occur in the case of the transmission unit in terms of sealing technology is largely decoupled from the pump housing, making these units light can be separated from each other.
- a generic rotary lobe pump which is thereby is characterized in that two hollow shafts are rotatably mounted in the gear housing, in which the End portions of the shafts are held.
- the gear housing is preferably detachable with a flange-like connection Pump housing held.
- the shafts are expediently each with a sealing unit opposite Sealed pump housing, the sealing units being substantially cylindrical Have outer surfaces so that they in one or the other axial direction in the Pump housing can be installed or removed.
- the sealing units are preferably designed as exchangeable sealing cassettes.
- the sealing units may be one with a lubricant have filled barrier chamber.
- the barrier chamber can be overpressured responsive sensor to detect leaks.
- the hollow shafts preferably extend in the axial direction up to Sealing units on the pump housing, so that the supporting effect of the hollow shafts in the As a rule, they are more rigid than the shafts themselves and are optimally used.
- the hollow shafts can each have two radial bearings and an additional one if used as a drive helical gear pair is selected, with an axial bearing in the gear housing be stored.
- the end sections of the shafts with feather keys are preferably non-rotatable and axially displaceable held in the hollow shafts. This results in an extremely simple assembly of the Units.
- the hollow shafts are expediently provided with two sealing units each Sealed gear housing, it is advantageous if the space between the Sealing unit in the pump housing and the adjacent sealing unit in the Gearbox is in connection with the environment, so that any escaping Lubricant and pump medium can flow away as freely as possible (without pressure).
- the rotary pistons preferably have a plurality arranged one next to the other in the axial direction Piston segments.
- the end portion of the shafts on the rotary piston side can be used to receive a radial bearing Supporting the shaft end against the pump housing can be designed so If necessary, a radial bearing can be retrofitted without much effort.
- the rotary lobe pump according to the invention in one shows side view, which is partially designed as a sectional view, the Cutting plane contains the longitudinal axes of the two shafts of the pump, as from the following description is still clear.
- the rotary lobe pump consists of the actual pump housing 1 and the one on it a flange connection 2 flanged gear housing 3.
- the essentially cylindrical pump housing 1 is made in one piece in the present embodiment and closed at the end with an end wall 1a and a lid 1b, while the Gear housing 3 is composed of two half-shell-like halves, the Division level with the sectional plane of the representation of FIG. 1 corresponds and with Screws 4 are held together.
- the purpose of the gear housing is to support the two shafts 5, 6 of the rotary lobe pump and the driving force introduced via the pin 7 from the shaft 6 in part onto the shaft 5 to transmit, the shafts with a pair of gears, one of which is designated 8 is coupled to one another and can be driven in opposite directions.
- bearings, sealing elements, etc. are only for shaft 5 in shown individually, of course corresponding elements for the shaft 6th available.
- the shafts are not mounted directly in corresponding bearings in the gear housing, but a hollow shaft 9 is provided for receiving a shaft, which in turn is rotatably mounted in the gear housing with roller bearings 10.
- Axial bearings 11 absorb forces that are introduced by helical gears 8.
- sealing units in the form of shaft sealing rings 12 and 13 are provided, which run on interchangeable liners 14 and 15.
- the gears 8 are held on the hollow shafts 9 in a rotationally fixed manner with feather keys. A defined axial position of the arrangement is ensured with circlips 16 and 17.
- FIG. 1 further shows, the shafts 5 and 6 with parallel keys 18 and corresponding ones in the Hollow shafts 9 formed longitudinal grooves rotatably and axially displaceable in the hollow shafts 9 held.
- the shafts 5 and 6 carry on their part opposite the gear housing one or more rotary piston segments 19 each, which are connected to a feather key connection 20 are rotatably and axially displaceable on the shafts.
- the pump segments point in this embodiment, a cast core 19a and a rubber jacket 19b, the segments in certain areas of application, for example in the Food industry, can also be made entirely of stainless steel.
- Interchangeable Wear discs 31 are located on the end of the pump housing between the rotary pistons and End wall 1a or cover 1b.
- the shafts 5 and 6 are in the area of the end wall 1 a of the pump housing sealed with a sealing unit, the structure of which is more clearly shown in detail in FIG. 2 emerges and which is also referred to below as a sealing cartridge 26.
- the sealing of the rotating shafts against the overpressure inside the pump housing takes place via a sealing surface between a cross-section firmly clamped on the shaft L-shaped sealing ring 22 and an elastically pressed over an O-ring 23 Wear ring 21.
- the O-ring 23 is in turn not directly supported on Pump housing 1, but is located within another, housing-like ring 25th
- a shaft sealing ring 27 Adjacent to this seal arrangement is additional within the seal cartridge 26 a shaft sealing ring 27 is provided, which in turn runs on a wear ring 24. Between the seal formed by the parts 21 and 22 and the shaft sealing ring 27 there is an intermediate space 28, which is referred to as a blocking chamber, and which has a suitable one Lubricant is filled and to detect leaks in the seal 21 and 22 serves.
- the blocking chamber 28 is connected to a pressure sensor via radial bores 37 connected. If there is a leak in the area of parts 21 and 22, the pressure in the Barrier chamber, which is registered by the sensor and triggers a corresponding signal.
- the sealing cassette 26 has a cylindrical shape on the outside and is held on the transmission side with a fastening ring 29 and screws 30 on the end face of the pump housing. On the pump side, the sealing cassette bears against the wear plate 31. Due to the cylindrical shape of the sealing cassette, depending on the type of maintenance work to be carried out, it can be pulled out either after removing the fastening ring 29 towards the gear housing or after removing the wear washer 31 towards the pump housing.
- the Seal cartridge can of course also be held with a press fit in the end wall, so that e.g. B. when removing the cassette from the pump side, the wear plate 31, the then must be provided with a corresponding axial recess, in place could remain.
- a space 32 which is in communication with the environment and the purpose of which is to prevent, on the one hand, possibly from the Lubricant escaping from the gearbox housing into the pump housing or on the other hand Any pump fluid emerging from the pump housing is pressed into the gear housing can be.
- the inventive holder of the shafts in hollow shafts in the above Wise Man has many advantages.
- the maintenance of the pump becomes significant Simplified, since either gearbox or pump housing can be easily removed from the respective unit can be removed without the bearing, sealing rings, etc. being pulled off the shafts Need to become.
- the gear housing after loosening the nut 34 and the gear housing on the screws 36 holding the pump housing are removed, after which maintenance work on the gearbox, on its seals or on the Sealing cassette 26 can be made.
- individual Rotary lobe fragments can be exchanged or checked.
- Another advantage of the hollow shafts according to the invention is that of overhung bearings Waves, as is the case in the illustrated embodiment, in that a additional support against unwanted deflection of the cantilever Shaft sections due to the length of the radial bearing 10 Hollow shafts is reached. Without the arrangement of a hollow shaft, the self-supporting Length of the waves begin immediately after the radial bearing 10, which is larger Deflection would result.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Rotary Pumps (AREA)
- Reciprocating Pumps (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Der Antrieb der Kolben erfolgt über eine ander betreffenden Seite des Pumpengehäuses anzubringende Getriebeeinheit, die im wesentlichen aus einem miteinander kämmenden Zahnradpaar auf den aus dem Pumpengehäuse ausgeführten Wellenabschnitten sowie aus einer jeweiligen Lagerung für die Wellen bestand.
Im Falle einer Undichtigkeit der pumpenseitigen Wellendichtung kann es bei entsprechendem Überdruck innerhalb des Pumpengehäuses dazu kommen, daß ein scharfer Strahl des Pumpmediums unter hohem Druck auf die getriebeseitige Wellendichtung trifft, wodurch Pumpmedium in das Getriebegehäuse eindringen und dort zu einem Schaden an Lagern, Zahnrädern etc. führen kann.
Bei entsprechenden Druckverhältnissen ist auch die umgekehrte Situation denkbar, wobei Schmiermedium in die Pumpe gelangen kann und bspw. die Anwendungen im Lebensmittelbereich großen Schaden verursachen kann.
Im Falle der häufig bevorzugten, wartungsarmen, fliegend gelagerten Bauweise tritt ein weiterer Nachteil dahingehend auf, daß die freitragende Länge der Welle aufgrund der zwangsläufig zwischen dem getriebeseitigen Lager und dem Drehkolben vorzusehenden, doppelten Dichtungsanordnung relativ groß wird. Damit sind entsprechende Durchbiegungen der Wellen an deren freien Endabschnitten verbunden, die mitunter zu einer zusätzlichen, abstützenden Lagerung mit einem entsprechenden Dichtungsaufwand zwingen.
Axiallager 11 nehmen Kräfte auf, die durch schrägverzahnte Zahnräder 8 eingeleitet werden. Zwischen Hohlwelle und Getriebegehäuse sind Dichtungseinheiten in Form von Wellendichtringen 12 und 13 vorgesehen, die auf auswechselbaren Laufbuchsen 14 und 15 laufen. Die Zahnräder 8 sind jeweils mit Paßfedern drehfest auf den Hohlwellen 9 gehalten. Mit Sicherungsringen 16 und 17 wird eine definierte axiale Position der Anordnung gewährleistet.
Aufgrund der zylindrischen Form der Dichtungskassette kann diese je nach Art einer vorzunehmenden Wartungsarbeit entweder nach Abnehmen des Befestigungsringes 29 zum Getriebegehäuse hin oder aber nach Abnehmen der Verschleißscheibe 31 zum Pumpengehäuse hin herausgezogen werden.
Claims (16)
- Drehkolbenpumpe mit einem Pumpengehäuse (1), in dem zwei gegenläufig rotierende, aufeinander abwälzende Drehkolben (19) auf zwei parallelen, beabstandeten Wellen (5,6) gehalten sind, wobei die Wellen aus dem Pumpengehäuse herausgeführt und mit ihren Endabschnitten in einem Getriebegehäuse (3) gelagert sind,
dadurch gekennzeichnet,
daß in dem Getriebegehäuse zwei Hohlwellen (9) drehbar gelagert sind, in denen die Endabschnitte der Wellen (5,6) gehalten sind. - Drehkolbenpumpe nach Anspruch 1,
dadurch gekennzeichnet,
daß das Getriebegehäuse mit einer flanschartigen Verbindung (2) lösbar am Pumpengehäuse gehalten ist. - Drehkolbenpumpe nach Anspruch 1 0der 2,
dadurch gekennzeichnet,
daß die Wellen jeweils mit einer Dichtungseinheit (26) gegenüber dem Pumpengehäuse abgedichtet sind, wobei die Dichtungseinheiten (26) im wesentlichen zylindrische Außenflächen aufweisen, so daß sie in der einen oder anderen axialen Richtung in das Pumpengehäuse ein- ausgebaut werden können. - Drehkolbenpumpe nach Anspruch 3,
dadurch gekennzeichnet,
daß die Dichtungseinheiten als austauschbare Dichtungskassetten (26) ausgebildet sind. - Drehkolbenpumpe nach Anspruch 3 oder 4,
dadurch gekennzeichnet,
daß die Dichtungseinheiten (26) eine mit einem Schmiermedium gefüllte Sperrkammer (28) aufweisen. - Drehkolbenpumpe nach Anspruch 5,
dadurch gekennzeichnet,
daß die Sperrkammer (28) mit einem auf Überdruck ansprechenden Sensor zum Erkennen von Undichtigkeiten verbunden ist. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß sich die Hohlwellen in axialer Richtung bis an das Pumpengehäuse erstrecken. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß die Hohlwellen jeweils mit zwei Radiallagern im Getriebegehäuse gelagert sind. - Drehkolbenpumpe nach Anspruch 8,
dadurch gekennzeichnet,
daß die Hohlwellen zusätzlich mit einem Axiallager im Getriebegehäuse gelagert sind. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß die Endabschnitte der Wellen (5,6) mit Paßfedern (18) drehfest und axial verschieblich in den Hohlwellen (9) gehalten sind. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß die Hohlwellen jeweils mit zwei Dichtungseinheiten (12,13) gegenüber dem Getriebegehäuse abgedichtet sind. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß der Zwischenraum zwischen der Dichtungseinheit (26) im Pumpengehäuse und der dazu benachbarten Dichtungseinheit (13) im Getriebegehäuse mit der Umgebung in Verbindung steht. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß in Axialrichtung zwischen den Drehkolben und dem Pumpengehäuse beidseitig jeweils eine auswechselbare Verschleißscheibe (31) angeordnet ist. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß die Drehkolben in Axialrichtung ein oder mehrere nebeneinander angeordnete Drehkolbensegmente (19) aufweisen. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß auf einer Welle (5,6) jeweils Hohlwelle (9) , Dichtungselemente (26) und Drehkolben (19) axial miteinander verspannt sind. - Drehkolbenpumpe nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet,
daß der drehkolbenseitige Endabschnitt der Wellen zur Aufnahme eines Radiallagers zum Abstützen des Wellenendes gegenüber dem Pumpengehäuse ausgelegt ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19646469A DE19646469C2 (de) | 1996-11-11 | 1996-11-11 | Drehkolbenpumpe |
DE19646469 | 1996-11-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0841482A2 true EP0841482A2 (de) | 1998-05-13 |
EP0841482A3 EP0841482A3 (de) | 1999-06-02 |
EP0841482B1 EP0841482B1 (de) | 2003-05-07 |
Family
ID=7811261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97119676A Expired - Lifetime EP0841482B1 (de) | 1996-11-11 | 1997-11-11 | Drehkolbenpumpe |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0841482B1 (de) |
AT (1) | ATE239870T1 (de) |
DE (2) | DE19646469C2 (de) |
ES (1) | ES2196238T3 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1043502A3 (de) * | 1999-04-08 | 2002-05-15 | Nakakin Co., Ltd. | Rotationspumpe |
EP1329635A1 (de) * | 1999-04-08 | 2003-07-23 | Nakakin Co., Ltd. | Rotationspumpe |
DE202010015437U1 (de) * | 2010-11-16 | 2012-02-17 | Hugo Vogelsang Maschinenbau Gmbh | Drehkolbenpumpe mit Hohlkolben |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012213735A1 (de) * | 2012-08-02 | 2014-02-27 | Robert Bosch Gmbh | Pumpe, insbesondere Verdrängerpumpe |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2642808A (en) * | 1948-05-17 | 1953-06-23 | Waterous Co | Sanitary pump |
JPS55148993A (en) * | 1979-05-10 | 1980-11-19 | Toko Sangyo Kk | Cover device for pump |
DE3307790A1 (de) * | 1982-07-29 | 1984-02-09 | Linde Ag, 6200 Wiesbaden | Aggregat aus zwei zahnringpumpen |
EP0444941A1 (de) * | 1990-02-28 | 1991-09-04 | Apv Crepaco Pumps Limited | Verbesserungen in bezug auf Drehkolbenpumpen |
EP0450690A1 (de) * | 1990-04-03 | 1991-10-09 | De Boer Stalinrichtingen B.V. | Pumpe zum Verdrängen |
EP0577064A1 (de) * | 1992-06-29 | 1994-01-05 | Nakakin Co., Ltd. | Drehkolbenpumpe |
DE4401688A1 (de) * | 1994-01-21 | 1995-07-27 | Alois Boerger | Rotorpumpe |
-
1996
- 1996-11-11 DE DE19646469A patent/DE19646469C2/de not_active Expired - Fee Related
-
1997
- 1997-11-11 EP EP97119676A patent/EP0841482B1/de not_active Expired - Lifetime
- 1997-11-11 ES ES97119676T patent/ES2196238T3/es not_active Expired - Lifetime
- 1997-11-11 DE DE59710027T patent/DE59710027D1/de not_active Expired - Lifetime
- 1997-11-11 AT AT97119676T patent/ATE239870T1/de not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2642808A (en) * | 1948-05-17 | 1953-06-23 | Waterous Co | Sanitary pump |
JPS55148993A (en) * | 1979-05-10 | 1980-11-19 | Toko Sangyo Kk | Cover device for pump |
DE3307790A1 (de) * | 1982-07-29 | 1984-02-09 | Linde Ag, 6200 Wiesbaden | Aggregat aus zwei zahnringpumpen |
EP0444941A1 (de) * | 1990-02-28 | 1991-09-04 | Apv Crepaco Pumps Limited | Verbesserungen in bezug auf Drehkolbenpumpen |
EP0450690A1 (de) * | 1990-04-03 | 1991-10-09 | De Boer Stalinrichtingen B.V. | Pumpe zum Verdrängen |
EP0577064A1 (de) * | 1992-06-29 | 1994-01-05 | Nakakin Co., Ltd. | Drehkolbenpumpe |
DE4401688A1 (de) * | 1994-01-21 | 1995-07-27 | Alois Boerger | Rotorpumpe |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 005, no. 022 (M-054), 10. Februar 1981 & JP 55 148993 A (TOKO SANGYO KK), 19. November 1980 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1043502A3 (de) * | 1999-04-08 | 2002-05-15 | Nakakin Co., Ltd. | Rotationspumpe |
EP1329635A1 (de) * | 1999-04-08 | 2003-07-23 | Nakakin Co., Ltd. | Rotationspumpe |
DE202010015437U1 (de) * | 2010-11-16 | 2012-02-17 | Hugo Vogelsang Maschinenbau Gmbh | Drehkolbenpumpe mit Hohlkolben |
Also Published As
Publication number | Publication date |
---|---|
ATE239870T1 (de) | 2003-05-15 |
DE19646469C2 (de) | 1999-06-24 |
EP0841482A3 (de) | 1999-06-02 |
DE59710027D1 (de) | 2003-06-12 |
EP0841482B1 (de) | 2003-05-07 |
DE19646469A1 (de) | 1998-05-20 |
ES2196238T3 (es) | 2003-12-16 |
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