EP2964957A1 - Exzenterschneckenpumpe mit überdruckschutz - Google Patents
Exzenterschneckenpumpe mit überdruckschutzInfo
- Publication number
- EP2964957A1 EP2964957A1 EP14715204.5A EP14715204A EP2964957A1 EP 2964957 A1 EP2964957 A1 EP 2964957A1 EP 14715204 A EP14715204 A EP 14715204A EP 2964957 A1 EP2964957 A1 EP 2964957A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outer part
- pump
- threads
- inner part
- stator
- 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
- 230000004323 axial length Effects 0.000 claims abstract description 10
- 239000011295 pitch Substances 0.000 claims description 11
- 239000013536 elastomeric material Substances 0.000 claims description 3
- 230000006837 decompression Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 230000009172 bursting Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012546 transfer 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
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/28—Safety arrangements; Monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/10—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
-
- 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
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
- F04C2/1075—Construction of the stationary member
-
- 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
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1076—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member orbits or wobbles relative to the other member which rotates around a fixed axis
-
- 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
- F04C2250/30—Geometry of the stator
Definitions
- the invention relates to a pump for conveying a conveying medium from an inlet side to an outlet side, with an outer part and an inner part arranged therein, of which one part rotatably driven and one part can perform an eccentric movement relative to the other part, wherein the inner part has at least one helically extending thread in the axial direction and the outer part has a number of threads higher than the inner part by one, wherein the ratio of the number of threads in each cross section is identical to the ratio of the pitches of the threads, and wherein the Touch outer part and the inner part so that between the parts conveying chambers are formed whose axial position is changed by rotation of one part relative to the other part, so that the fluid is conveyed from the inlet side to the outlet side.
- Screw-threaded outer part has an inner part, wherein the outer part has exactly one more thread than the inner part.
- the ratio of the pitch on the outer part to the pitch on the inner part corresponds to the ratio of the number of threads on the corresponding parts in each cross section.
- CONFIRMATION COPY Have completed space between the inlet and outlet side. This means that the threads of the outer part must have at least one complete screw thread.
- the inner part may be driven and act as a rotor, whereas the outer part remains stationary, i. acts as a stator.
- constructions with outer rotor and inner stator are also possible.
- constructions are possible in which either the inner part performs an eccentric movement relative to the outer part, for example in DE 602107, or the outer part performs an eccentric movement relative to the inner part.
- the latter variant which also has a rotatably driven inner part, is described in US Pat. Nos. 2,612,845 and 2,691,347.
- the stationary outer part (the pump stator) consists of an elastic material and is deformed so that it on a
- Circular path moves around the central pump rotor axis and thus compensates for the eccentricity between the inner rotating part (pump rotor) and outer part.
- the outer part is therefore also referred to as a cantilever or wobbler. This can be with the usual in the eccentric screw with
- Eccentric screw pumps are among the rotary positive displacement machines. In operation, they convey through the delivery chambers, i. the closed spaces between the inner part and the outer part, continuously to the exit side. If there is a closed volume on the outlet side, for example because of a closed valve, in particular a flow restrictor, pressure builds up continuously in the closed volume. Because without suitable measures, the pump will continue to pump fluid through the moving, closed delivery chambers from the inlet to the outlet side, whereby the pressure at the outlet rises sharply. In the field of wastewater engineering, in which the considered pumps are preferably used, the
- Monitoring devices such as pressure sensors and on the other hand
- pressure relief devices can, for example
- Rupture discs relieve a pressurized system by being destroyed when bursting pressure is applied and releasing an orifice to drain the pressurized fluid. To put the system back into service is an exchange of the destroyed rupture disk
- the service life depends on the ratio of the actual operating pressure to the bursting pressure, so that the rupture disk z. B. by short
- Bypass line can be bypassed a closed valve or the clogged point behind the pump. However, this requires an increased
- a pump having the features of claim 1.
- Preferred developments are specified in the subclaims.
- a pump for conveying a pumped medium from an inlet side to an outlet side is proposed, with an outer part and an inner part arranged therein, of which one part is rotatably driven and one part can perform an eccentric movement relative to the other part, wherein the inner Part at least one in the axial direction
- helically extending thread and the outer part having a number of threads higher than the inner part by one, wherein the ratio of the numbers of threads in each cross section is identical to the ratio of the pitches of the threads, and wherein the outer part and the inner Touch part such that between the parts conveying chambers are formed whose axial position is changed by rotation of one part relative to the other part, so that the fluid from the inlet side to the outlet side is conveyed, the threads of the outer part along its axial length less than a whole helix is twisted.
- the basic idea of the present invention is thus to shorten the axial length of the outer part compared with the known designs of progressing cavity pumps such that the threads of the outer part do not wind through a full 360 ° about the axis of symmetry of the outer part.
- This has the effect that there are not always closed chambers between the inner part and the outer part. Rather, with one part rotating relative to the other part, there is a moment in each delivery chamber, i. a position of the parts to each other, in which the respective chamber is open both to the inlet side and to the outlet side. As a result, an outlet side building up
- Threads of the outer part rests approximately positively.
- the resulting contact surfaces each delimit a delivery chamber.
- Delivery chambers extend spirally in the axial direction and move in the direction of this spiral when one part is relatively rotated relative to the other part. This means that also the contact surfaces between inner and outer part wander spirally.
- this delivery chamber opens towards the exit side.
- the delivery chamber at the entry side i. at her in
- a portion of the inner part is just in the axial center of the two parts in this second thread.
- a second and third delivery chamber consist, which are each half open.
- the second delivery chamber located in the spiral direction is open to the outlet side
- the third delivery chamber lying in the spiral direction is open to the inlet side.
- Delivery chamber is still not closed on the inlet side, it is clear that the delivery chamber is not completely completed in this position. Rather, it is no longer complete to any page, i. open on both sides.
- the second and third delivery chamber are closed on one side, the second, forward delivery chamber in the spiral direction to the rear, the third, rear delivery chamber in the spiral direction forward. There is thus no more delivery chamber, which is completely completed.
- the leading end of the third delivery chamber reaches the exit side and opens to it, while this delivery chamber has not yet completely closed on the inlet side.
- a pressure which builds up on the outlet side leads in each case briefly to a flow from the pressure side (outlet side) to the suction side (inlet side) through the respective delivery chamber open on both sides, ie. to an internal leakage between the inlet side and the outlet, and thus to a shock-like pressure reduction.
- the threads of the outer member are wound only between 75% and 95% of a full helix along its axial length. In this area, it is ensured that pressure reduction takes place effectively through a delivery chamber open on both sides, without the volumetric flow capability being impaired too much.
- either the inner part or the outer part may be rotationally driven.
- the inner part may move eccentrically to the outer part, in particular on a circular path, or the outer part to move eccentrically to the inner part, in particular on a circular path.
- the outer part moves eccentrically about the axis of the inner part, the inner part being rotationally driven, i. a rotor and the outer part forms a stator. This has the advantage that elaborate joints can be dispensed to one of the parts on one
- the outer part is made of an elastomeric material. This has the advantage that the outer part can be deformed, so that a low-wear frictional contact between the inner and the outer part is achieved. Furthermore, the outer part may preferably be held at one of its axial ends by means of an elastic holding means on the pump housing.
- Holding means allows the outer part to move on a circular path eccentric to the inner part. Due to the one-sided attachment, the outer part oscillates virtually in the manner of a wobble stator.
- Figure 1 an axial section through an inventive
- FIG. 1 shows a pump in the form of an eccentric screw pump. It has an inlet side 7 and an outlet side 8.
- Transfer medium is conveyed during operation of the pump from the inlet side to the outlet side.
- the pump has an outer part 2 and an inner part 3 arranged therein.
- the inner part 2 is driven by these parts. He forms the rotor of the
- the outer part 2 performs in operation relative to the inner part 3 an eccentric movement on a
- the outer part 3 is approximately cylindrical and merges integrally at the end which is near the inlet side 7 into an elastic retaining means 1 arranged even further outwards.
- This holding means 1 is made together with the outer part 2 of an elastomeric plastic. The holding means 1 and the outer part 2 together form the stator of the eccentric screw pump, the outer stator part 1 in the
- the inner part 2 (rotor) has exactly one in the axial direction
- the outer part 3 (stator inner part) has on its inside a higher number of threads 5a, 5b than the inner part 2, namely two threads, which also extend helically in the axial direction.
- Figure 1 purely by way of example to understand and any other number of threads is possible.
- the profiles of the inner part 3 and the outer part 2, ie the outer profile of the inner part 3 and the inner profile of the outer part 2 may be arbitrary, in particular have one of the profile shapes, which are shown in DE 602107.
- the ratio of the numbers of threads 5a, 5b, 6 here is 1: 2.
- Slopes of the threads of outer part 2 and inner part 3 is chosen so that in each cross section, the ratio of the pitches of the threads 5a, 5b, 6 is identical to the ratio of the numbers of threads 5a, 5b, 6.
- the pitches of the internal threads 5a, 5b of the outer part 2 are significantly larger than the pitch of the external thread of the inner part 3.
- the external thread 6 of the inner part 3 has two full turns, i. it extends in the axial direction along two full helixes. Due to the higher pitch, the internal threads 5a, 5b would have the same axial length as the rotor 3, only 1 full turn.
- the outer part 2 and the inner part 3 are in contact with one another such that delivery chambers A, B are formed between them whose axial position can be changed by rotation of the inner part 2, 3 relative to the outer part 3, 2, so that the delivery medium from the inlet side 7 to the outlet side 8 is conveyed.
- the threads 5a, 5b of the outer part 2, ie the inner stator part 2 are wound less than an entire helix.
- the axial length L of the inner stator part 2 is shorter compared to a conventional stator of an eccentric screw pump whose internal threads extend at least along a full helix.
- FIG. 2 shows measured normalized hydraulic characteristics for a pump with conventional stator 2 (solid line), in which the stator length L is greater than the pitch Hst, and for a stator 2 according to the invention with stator length L smaller than the pitch Hast (dashed line).
- the values for the delivery head H and the volume flow Q are normalized to the maximum values H n0 m and Qnom. It is clear that the shortening of the stator length L such that the threads 5a, 5b of the outer part 2 less than a whole
- an eccentric screw pump need not necessarily have at least one closed space between the inner part 3 and the outer part 2, as described in DE 602107, i. E. the threads of the outer part must have at least one screw thread. Rather, a shortened compared to this technical teaching stator 2 can be used, which surprisingly leads to the described pressure reduction on the pressure side 8 and also causes an increase in efficiency during operation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL14715204T PL2964957T3 (pl) | 2013-03-07 | 2014-02-06 | Mimośrodowa pompa ślimakowa z ochroną przed nadmiernym ciśnieniem |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013003833.2A DE102013003833A1 (de) | 2013-03-07 | 2013-03-07 | Pumpe mit Überdruckschutz |
PCT/EP2014/000320 WO2014135239A1 (de) | 2013-03-07 | 2014-02-06 | Exzenterschneckenpumpe mit überdruckschutz |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2964957A1 true EP2964957A1 (de) | 2016-01-13 |
EP2964957B1 EP2964957B1 (de) | 2017-11-22 |
Family
ID=50439316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14715204.5A Active EP2964957B1 (de) | 2013-03-07 | 2014-02-06 | Exzenterschneckenpumpe mit überdruckschutz |
Country Status (6)
Country | Link |
---|---|
US (1) | US9920758B2 (de) |
EP (1) | EP2964957B1 (de) |
CN (1) | CN105121853B (de) |
DE (1) | DE102013003833A1 (de) |
PL (1) | PL2964957T3 (de) |
WO (1) | WO2014135239A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202013004219U1 (de) * | 2013-05-06 | 2013-05-17 | SGF SüDDEUTSCHE GELENKSCHEIBENFABRIK GMBH & CO. KG | Stator für eine Förderpumpe |
JP2017535412A (ja) * | 2014-10-07 | 2017-11-30 | アクセス ビジネス グループ インターナショナル リミテッド ライアビリティ カンパニー | 個人用製剤装置 |
DE202015006862U1 (de) | 2015-10-02 | 2015-10-23 | Beinlich Pumpen Gmbh | Pumpe für hydraulische Medien |
DE102017004949B4 (de) | 2017-05-23 | 2021-12-09 | Thomas Magnete Gmbh | Hubkolbenpumpe |
CN108000836B (zh) * | 2017-12-11 | 2023-08-29 | 华南理工大学 | 偏心转子挤出机的熔体输送流量平衡补偿方法及稳定装置 |
DE102021006414A1 (de) * | 2021-12-30 | 2023-07-06 | Seepex Gmbh | Stator für eine Exzenterschneckenpumpe |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE602107C (de) | 1930-05-13 | 1934-09-03 | Rene Joseph Louis Moineau | Als Pumpe, Motor oder einfaches UEbertragungsgetriebe verwendbare Vorrichtung aus zwei ineinander angeordneten Teilen mit dauernd in Beruehrung stehenden Zaehnen |
US2612845A (en) | 1950-04-29 | 1952-10-07 | Robbins & Myers | Helical gear pump with nonrigid casing |
US2691347A (en) | 1950-10-19 | 1954-10-12 | Robbins & Meyers Inc | Helical gear pump with backed-up nonrigid casing |
US2826152A (en) * | 1955-08-30 | 1958-03-11 | Robbins & Myers | Helical gear pump with bellows stator |
DE2139949A1 (de) * | 1970-08-31 | 1972-03-02 | Environment/One Corp., Schenectady, N.Y. (V.St.A.) | Schraubenpumpe |
US3802803A (en) | 1971-10-13 | 1974-04-09 | A Bogdanov | Submersible screw pump |
DE4134853C1 (de) | 1991-05-22 | 1992-11-12 | Netzsch-Mohnopumpen Gmbh, 8264 Waldkraiburg, De | |
DE4116697C1 (en) * | 1991-05-22 | 1992-03-12 | Netzsch-Mohnopumpen Gmbh, 8264 Waldkraiburg, De | Casing for eccentric worm pump with split stator jacket - has stator arranged to burst on excess of preset inner overpressure in split region |
DE19842754C2 (de) * | 1998-09-18 | 2001-04-26 | Seepex Seeberger Gmbh & Co | Exzenterschneckenpumpe |
DE20304292U1 (de) * | 2003-03-12 | 2003-05-15 | Stegner Anke | Exzenterschneckenpumpe |
JP2008175199A (ja) | 2006-12-20 | 2008-07-31 | Heishin Engineering & Equipment Co Ltd | 一軸偏心ねじポンプ |
-
2013
- 2013-03-07 DE DE102013003833.2A patent/DE102013003833A1/de not_active Withdrawn
-
2014
- 2014-02-06 CN CN201480022381.1A patent/CN105121853B/zh active Active
- 2014-02-06 US US14/769,351 patent/US9920758B2/en active Active
- 2014-02-06 PL PL14715204T patent/PL2964957T3/pl unknown
- 2014-02-06 WO PCT/EP2014/000320 patent/WO2014135239A1/de active Application Filing
- 2014-02-06 EP EP14715204.5A patent/EP2964957B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2014135239A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2014135239A1 (de) | 2014-09-12 |
EP2964957B1 (de) | 2017-11-22 |
US20160003244A1 (en) | 2016-01-07 |
PL2964957T3 (pl) | 2018-04-30 |
CN105121853A (zh) | 2015-12-02 |
CN105121853B (zh) | 2016-11-30 |
US9920758B2 (en) | 2018-03-20 |
DE102013003833A1 (de) | 2014-09-11 |
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