EP2304246B1 - Vorrichtung zur laufradabdichtung bei kreiselpumpen - Google Patents

Vorrichtung zur laufradabdichtung bei kreiselpumpen Download PDF

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Publication number
EP2304246B1
EP2304246B1 EP09745466.4A EP09745466A EP2304246B1 EP 2304246 B1 EP2304246 B1 EP 2304246B1 EP 09745466 A EP09745466 A EP 09745466A EP 2304246 B1 EP2304246 B1 EP 2304246B1
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EP
European Patent Office
Prior art keywords
ring
impeller
sealing
pump housing
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.)
Active
Application number
EP09745466.4A
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German (de)
English (en)
French (fr)
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EP2304246A1 (de
Inventor
Uwe Würdig
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Individual
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    • 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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel

Definitions

  • the invention relates to a device for impeller sealing in centrifugal pumps for fluid media.
  • the device serves to seal the centrifugal pumps by design existing gap between the impeller and the pump housing against mass transfer from the pressure side of the impeller to the suction side at the impeller inlet. It is used for the original equipment of generic pumps in the course of their production, but also for the retrofitting of previously not provided with a corresponding gap seal pump.
  • Centrifugal pumps of different designs are used for the transport of fluid media, in particular liquids in very large numbers.
  • the pumps consist of one or more impellers arranged on a shaft, which, driven by a motor, move in a corresponding free space of a pump housing (also referred to as housing bore).
  • a respective impeller generates a negative pressure at its impeller inlet side, at which the inflow for the fluid medium to be conveyed is located.
  • the medium is entrained at or in the impeller and transported by this in the course of the rotational movement to the impeller outlet on the pressure side of the impeller.
  • a gap between the impeller and the inner wall of the pump housing is essential. This is designed depending on the housing shape and impeller shape as axial or radial gap.
  • the gap kept low or optimized and beyond can be kept as constant as possible in the long-term operation of the pump.
  • a device for optimizing the gap width described in centrifugal pumps After the solution described, a bead is formed on the outer circumference of the free end of a pump impeller. This bead is guided when inserting the impeller in the pump housing behind a sealing collar, which is formed on a housing arranged in the split ring. As a result, a very small gap size is achieved.
  • the sealing collar according to the solution is a rigid element, there is a risk that it may become if deposits form on it, runs into the impeller above the bead formed on the impeller. In addition, a mass transport from the pressure side to the suction side is not prevented by the remaining small gap, so that the risk of braid formation and finally the clogging of the gap is not eliminated.
  • a likewise relatively simple solution is also by the DE 10 2005 019 654 A1 disclosed.
  • the gap is largely sealed by means of two bead seals whose elastic sealing lips each slide along an outer surface, referred to as a sealing surface, of a sleeve of the impeller.
  • the seal is not complete. Rather, certain leakage currents are accepted, which are given by the fact that a part of the conveyed, pressurized medium is fed to the sealing lips in order to press them to the Dichtdietarymoi sliding surface.
  • the flow volume used in this way of the sealing lips pressurizing medium (pressurizing medium) is returned via a screw-like profiling of the sealing surface as leakage to the suction side of the pump.
  • a smaller volume flow of the pressurizing medium is guided to the first, further from the gap remote sealing lip and previously cleaned to prevent wear of the sealing lip by the pressurizing medium in their passage over the introduced into the sliding helical profiling.
  • On the closer to the gap arranged second sealing lip a larger volume flow unpurified sealing medium is performed.
  • the object of the invention is therefore to provide a device for impeller sealing in centrifugal pumps, through which in a very simple structure of the device, the mass transport between the pressure side of the impeller of a centrifugal pump and the impeller inlet permanently reliably prevented, but still an unobstructed rotational movement of the wheels or in the pump housing is made possible.
  • the device By means of the device to be created, in particular even when used in sewage pumps such mass transport and thus braid formation in the gap area are to be prevented.
  • the device should allow both the factory equipment of pumps as well as be retrofitted.
  • the device according to the invention can be used both in centrifugal pumps with an axial gap and in those with a radial gap, depending on the geometry of their elements and their structural arrangement in the pump, as already stated. Furthermore, both single-stage and multi-stage centrifugal pumps, that is centrifugal pumps with more than one impeller, factory or in the course of retrofitting can be equipped with the inventive device.
  • a sealing ring is arranged in the pump housing of a device equipped with or retrofitted centrifugal pump between the pressure side and the suction side of the at least one impeller, which consists of a rigid pressure ring and one with the pressure ring
  • the sealing lip is connected in the region of its inner diameter with the pressure ring.
  • the sealing lip In one of the pressure ring upstanding and / or the pressure ring, based on its diameter, projecting region, the sealing lip is inclined against a formed on the peripheral contour in the region of the impeller inlet on the impeller sliding surface.
  • the sealing ring formed as described above acts according to the invention held on the pump housing actuator. By this actuator, the sealing ring is positioned with respect to the sliding surface and at the same time its sealing lip in the protruding from the pressure ring and / or biased the diameter of the pressure ring portion biased against the sliding surface of the impeller.
  • the sealing ring is thereby positioned and its sealing lip biased so that it rests with a radially outer end of the aforementioned area in the operation of the pump on the sliding surface.
  • the adjustment to be made on the actuator may be such that the sealing lip abuts only slightly (very low bias) on the corresponding sliding surface of the impeller in the resting state of the pump and the concerns of the radially outer end of the sealing lip on the sliding surface during operation of the pump In addition, between its pressure side and the suction side existing pressure difference is ensured safe.
  • the sealing device is designed so that due to the deformability of the projecting for this purpose in sufficient length of the pressure ring and / or him sufficient extent with respect to its diameter region of the sealing lip and the bias generated by means of the actuator in the sealing lip bias a permanent as well self-adjusting complete sealing of the gap is given.
  • a permanent as well self-adjusting complete sealing of the gap is given.
  • the sealing ring is adjusted by means of the actuator with regard to its position and the preloading of its sealing lip such that the radially outer end of the sealing lip just touched the wear ring with the lowest possible bias voltage.
  • the sliding surface is part of a fixed in the region of the impeller inlet on the peripheral contour of the impeller rigid wear ring.
  • the abovementioned wear ring can already be arranged on the impeller at the factory on a pump equipped with the device according to the invention or can be fastened in the course of a retrofit with appropriate reworking of the impeller.
  • the wear ring is made of a particularly wear-resistant material such as stainless steel, ceramic or a special composite, or it is at least provided with a special wear protection coating.
  • the wear-resistant sliding surface is preferably realized by applying a wear ring on the impeller in the impeller inlet.
  • the sealing ring is, as already stated, realized by a rigid pressure ring and an elastic sealing lip connected to it, wherein the pressure ring also consists of a wear-resistant material, preferably metal.
  • the sealing lip according to a preferred embodiment of the invention consists of an elastomer and is connected to the pressure ring by vulcanization.
  • the invention can be advantageously further developed by the fact that in the elastomer for mechanical stabilization, a reinforcing material, preferably a metal mesh, is embedded. Furthermore, it is possible to vulcanize a metal spring washer for stabilization in the elastomer.
  • the geometry of the elastic, preferably made of an elastomer or rubber sealing lip is advantageously designed so that the thickness is reduced radially outward.
  • This design of the geometry of the sealing lip and the measures already explained above their mechanical stabilization serve the fact that the sealing lip, even with large pressure differences between the pressure side and the impeller inlet side, the basic idea of the invention is applied only with its radially outermost region slidably applied to the wear ring or the sliding surface. It has been shown that without appropriate measures due to the hollow, acting on the sealing lip pressure there is a risk that the sealing lip is bent or kinked and thus comes with a large area on the wear ring to the plant, thereby increasing the risk that the Sealing lip increasingly incorporated in the course of time in the sliding surface or in the wear ring.
  • the gap seal due to the bias of the elastic sealing lip against the sliding surface is self-adjusting insofar as the sealing lip, even if it gradually abrades during operation, due to the given during operation pressure difference between the pressure and the suction side up to a certain Wear level is still sealing against the sliding surface when the pump is in operation.
  • a complete sealing of the gap during operation of the pump, by which an accumulation of solids and / or contained in the conveyed medium fibrous components in the gap region and thus clogging by braid formation is effectively prevented even when used in wastewater, even then still be given when the sealing lip is no longer applied to the sliding surface when the pump is switched off due to material wear.
  • the bias in the elastic sealing lip of the sealing ring is achieved by suitable positioning of the sealing ring in the pump housing or in relation to the sliding surface, wherein the sealing ring is supported on a present in the interior of the pump housing abutment so that on its sealing lip a certain Pressure is exercised.
  • the solution according to the invention may possibly also be realized by an already existing split ring fixed in the pump housing acting as an abutment, as is customary for setting a predetermined gap width in pumps of the prior art, after corresponding reworking according to the invention with a counterpart, a likewise retrofitted wear ring of the impeller or its sliding surface inclined sealing lip is connected by mechanical fastening or vulcanization.
  • a practice-oriented, preferably especially for use in single-stage centrifugal pumps provided with axial gap training of the invention acting on the sealing ring actuator is designed as an adjustable in the axial direction with respect to its position collar, which acts directly on the sealing ring.
  • the threads for the screws of the actuator are each arranged in a part in the arranged on the outer circumference of the housing ring circular segment-shaped recesses and another part in corresponding to these recesses of the housing ring and together with these preferably each a full circle enclosing, annular recesses of the pump housing educated.
  • the adjusting ring has an external thread and is brought into engagement with a correspondingly arranged internal thread of the pump housing.
  • the axial position of the adjusting ring is thus adjustable within the centrifugal pump by rotating the adjusting ring in the internal thread of the pump housing.
  • the device according to the invention is suitable for the original equipment of centrifugal pumps as well as their retrofitting. Therefore, the device according to an intended for retrofitting training is designed so that their respective elements are components of a kit, which is also attached to a drilling template or a jig for the correct position arrangement of the screws and optionally for the locking screws to be formed threaded holes.
  • the pump consists of the pump housing 1 in which the arranged on a motor shaft not shown impeller 2 or channel wheel during operation of the pump in the circumferential direction u moves.
  • the motor also not shown here, is flange-mounted on the pump housing 1 on the right-hand side of the pump so that the motor shaft extends in the axial direction a.
  • the gap to be sealed is formed, in which it is due to the design of the pump shown in the example is an axial gap. This gap is by means of, in the enlarged section after the Fig. 2 again better illustrated inventive device against mass transfer between the pressure side 3 of the pump and the impeller inlet 5 on the suction side 4 of the pump completely sealed.
  • the Fig. 2 shows an enlarged section of the after the device according to the invention for impeller sealing after or retrofitted centrifugal pump according to Fig. 1 , in a sectional view.
  • a shoulder has been formed by twisting on the outer contour of the impeller 2.
  • highly wear-resistant wear ring 6 was attached and by means of several screws to the impeller 2. For this purpose, previously distributed on the circumference, corresponding with the counterbores of the wear ring 6 corresponding threaded holes are introduced into the impeller 2.
  • the adjusting ring 9 in the axial direction a is movable.
  • the adjusting screws 10 serve at the same time for fastening the housing ring 11 in the pump housing 1.
  • the paragraph provided with adjusting ring 9 presses against the flexible portion 8 'of the sealing lip 8 of between the adjusting ring 9 and the wear ring 6 Sealing ring, wherein the pressing force with which the sealing lip 8 is pressed against the wear ring 6, is dependent on the adjustable by means of screws 10 position of the adjusting ring 9.
  • the sealing ring consists of a rigid metallic pressure ring 7 to which the annular rubber sealing lip 8 is screwed in the example shown.
  • the sealing lip 8 is biased by the adjusting ring 9 so that it, as shown in the figure, with the pump off only with respect to its outer peripheral end 8 "of the pressure ring 7 superior flexible portion 8 'on the wear ring. 6
  • the sealing lip 8 is pressed closer to the wear ring 6 with complete sealing of the axial gap due to the pressure difference between the pressure side 3 of the pump and the impeller inlet 5 of the suction side 4.
  • the sealing lip 8 is only slidable with the outer end 8 "of the area 8 'on the wear ring 6, so that the rotational movement of the impeller 2 of the pump is still possible. Due to the applied to the sealing lip 8 bias remains while the sliding contact with the sliding surface 6 even with operationally occurring axial and / or radial vibrations of the impeller 2 always exist. It is thus a reliable despite possible vibrations, but beyond also permanent, self-adjusting complete seal for the gap between the pump housing 1 and the suction side 4 of the impeller 2 and the impeller inlet 5 given.
  • a centrifugal pump equipped with the device according to the invention as a wastewater pump As a result, a braid formation in the gap region and thus a subsequent blockage of the pump is reliably prevented.
  • the adjusting ring 9 can also be inserted directly into the pump housing 1 without additional housing ring 11.
  • the screws 10 are guided by axially extending threaded holes in the pump housing 1.
  • the embodiment without additional housing ring 11 is of course to give preference.
  • the representation of in the Fig. 1 to 3a or 3b shown embodiment serve to show that even in-use pumps can be easily retrofitted with the device according to the invention.
  • FIG. 4 Another embodiment of the device according to the invention is in the Figure 4 in one with the Fig. 2 shown comparable representation.
  • the axial position of the adjusting ring 9 in accordance with the requirements, that is concern of the radially outer end 8 "of the pressure ring 7 upstanding portion 8 'of the sealing lip 8 under the lowest possible bias on the wear ring 6, adjustable corresponding adjustment position of the adjusting ring 9 by means of the locking screws 15 (in the outer region of the adjusting ring are arranged one or more locking screws 15) which act as clamping screws and brace the flanks of the threads 13, 14 of the adjusting ring 9 and the pump housing 1 against each other between the pump housing 1 and the adjusting ring 9, an O-ring 16 made of rubber.
  • the device according to the invention is achieved by the complete prevention of backflow, namely the return flow from the pressure side 3 to the suction side 4 on the impeller 2, and by eliminating cross-flow losses a significant increase in efficiency at appropriately equipped centrifugal pumps.
  • Suction-side blockages are effectively prevented, in particular in sewage pumps with single or multi-channel impellers.
  • the device is also characterized by a simple structure and a good retrofitting in already in use pumps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP09745466.4A 2008-05-15 2009-05-15 Vorrichtung zur laufradabdichtung bei kreiselpumpen Active EP2304246B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008001814A DE102008001814A1 (de) 2008-05-15 2008-05-15 Vorrichtung zur Laufradabdichtung bei Kreiselpumpen
PCT/DE2009/050026 WO2009138082A1 (de) 2008-05-15 2009-05-15 Vorrichtung zur laufradabdichtung bei kreiselpumpen

Publications (2)

Publication Number Publication Date
EP2304246A1 EP2304246A1 (de) 2011-04-06
EP2304246B1 true EP2304246B1 (de) 2014-07-23

Family

ID=41017071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09745466.4A Active EP2304246B1 (de) 2008-05-15 2009-05-15 Vorrichtung zur laufradabdichtung bei kreiselpumpen

Country Status (6)

Country Link
US (1) US20110064566A1 (zh)
EP (1) EP2304246B1 (zh)
CN (1) CN102027241B (zh)
DE (2) DE102008001814A1 (zh)
RU (1) RU2474730C2 (zh)
WO (1) WO2009138082A1 (zh)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010063108A1 (de) 2010-12-15 2012-06-21 Ksb Aktiengesellschaft Dichtungsanordnung für Kreiselpumpen
EP2535591B1 (de) * 2011-06-15 2014-04-23 Grundfos Management A/S Kreiselpumpe
CN102269178A (zh) * 2011-07-01 2011-12-07 海南南方特能泵业有限公司 吸水室密封式高效离心水泵
DE102011054320A1 (de) * 2011-10-07 2013-04-11 Uwe Würdig Kreiselpumpe und Anordnung zur Spaltabdichtung
DE102012218606A1 (de) * 2012-10-12 2014-04-17 Ksb Aktiengesellschaft Spaltring mit selbstregulierendem Drosselspalt
DE102013104069B4 (de) 2013-04-22 2017-09-28 Uwe Würdig Kreiselpumpe und Anordnung zur saugseitigen Radialspaltabdichtung
US9739284B2 (en) * 2013-11-19 2017-08-22 Charles Wayne Zimmerman Two piece impeller centrifugal pump
RU168588U1 (ru) * 2016-03-03 2017-02-09 Открытое акционерное общество (ОАО) "Турбонасос" Щелевое радиальное уплотнение между корпусом и ротором
RU169809U1 (ru) * 2016-10-31 2017-04-03 Открытое акционерное общество (ОАО) "Турбонасос" Щелевое радиальное уплотнение
CN106968983B (zh) * 2017-05-19 2023-10-13 合肥工业大学 一种用于减少泄漏的易安装口环
CN107178520B (zh) * 2017-08-02 2023-06-23 汪小艳 一种提高离心水泵运行效率的方法及组合弹性密封装置
CN107387456A (zh) * 2017-09-04 2017-11-24 河北兴临水泵有限公司 水泵密封装置
JP7124422B2 (ja) * 2018-04-27 2022-08-24 株式会社アイシン ポンプ

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Also Published As

Publication number Publication date
EP2304246A1 (de) 2011-04-06
US20110064566A1 (en) 2011-03-17
CN102027241A (zh) 2011-04-20
CN102027241B (zh) 2013-06-05
RU2474730C2 (ru) 2013-02-10
WO2009138082A1 (de) 2009-11-19
RU2010145437A (ru) 2012-06-20
DE102008001814A1 (de) 2009-11-19
DE112009001716A5 (de) 2011-04-21

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