EP2438305B1 - Seal for rotary pump - Google Patents
Seal for rotary pump Download PDFInfo
- Publication number
- EP2438305B1 EP2438305B1 EP10722626.8A EP10722626A EP2438305B1 EP 2438305 B1 EP2438305 B1 EP 2438305B1 EP 10722626 A EP10722626 A EP 10722626A EP 2438305 B1 EP2438305 B1 EP 2438305B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- seal
- seal housing
- projection
- housing cover
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 12
- 229910000906 Bronze Inorganic materials 0.000 description 5
- 239000010974 bronze Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000012809 cooling fluid Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
Images
Classifications
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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
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
- F04D27/0215—Arrangements therefor, e.g. bleed or by-pass valves
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
- F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
- F04D29/0416—Axial thrust balancing balancing pistons
-
- 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
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
- F04D29/128—Shaft sealings using sealing-rings especially adapted for liquid pumps with special means for adducting cooling or sealing fluid
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/5893—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps heat insulation or conduction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
Definitions
- the invention relates to a centrifugal pump for conveying hot fluids, with a contacting shaft seal, a seal housing for the shaft seal and a return line for a partial flow of the conveying fluid.
- Such a centrifugal pump is in the DE 42 30 715 A1 described, which is used as a feed pump for the promotion of hot fluids.
- a discharge fluid exiting from the discharge device forms a partial flow of the delivery fluid.
- This partial flow also known as discharge water, is used to cool a mechanical seal. For this purpose, it flows through the sealing space completely, thereby dissipating the frictional heat generated during operation of the mechanical seal.
- the discharge water is then removed from the seal space via a return line connecting the seal housing to a pump stage.
- This type of shaft seal cooling can only be used up to a certain operating temperature of the delivery fluid.
- a centrifugal pump with a sealing system for higher operating temperatures is used in the DE 195 18 564 A1 described.
- a further sealing element is arranged, which bears against the rotating part of the pump.
- This sealing element consists of a high polymer plastic.
- the sealing element shields the sealing space from the hot conveying fluid in the pump interior and at the same time ensures a pressure equalization with respect to the sealing space.
- the discharge water is returned through a return line to the suction side of the centrifugal pump.
- the seal housing is integrated into a cooling circuit, the cooling fluid was initially removed from the fluid flow. By a connected to the seal housing separate cooling circuit, the heat is removed from the cooling fluid.
- conventional external cooling systems can be used.
- the object of the present invention is to provide a multi-stage centrifugal pump in which the shaft sealing system is designed for a temperature range of the conveying fluid exceeding 160 ° C. and that it can be used for the entire temperature range of feed pumps. Furthermore, it is an object of the invention to dispense with the supply of external cooling fluids in the seal chamber and to provide a cost-effective, reliable sealing system.
- seal housing composed of an inner part and an outer part, wherein the inner part of a different material than the outer part.
- the rotating component may be either the shaft of the pump or a shaft sleeve pushed over the pump shaft.
- the axial gap extends parallel to the shaft and passes around the shaft. Geometrically, this gap is a hollow cylinder.
- the gap throttles the influx of the pump delivery fluid into the seal chamber. The narrower and the longer the gap, the less discharge water can enter the seal housing.
- the invention is used in multi-stage centrifugal pumps, in which the centrifugal pump has a relief device for the axial thrust, the contacting shaft seal of the relief device is arranged downstream, being discharged through the return line discharge water.
- the return line for the discharge water is an additional source of heat when conveying hot fluids, which can exert a negative influence on the shaft seal.
- the connection for a return line for the discharge water has been arranged away from the seal housing. Thus, the heat from the return line can not be delivered directly to the seal housing.
- the new seal housing encloses the touching seal.
- the seal is a mechanical seal.
- the division into a housing cover and a new seal housing a thermal decoupling of the seal chamber is achieved with respect to the hot pump housing. On the one hand, this happens because the heat conduction between the housing cover and the seal housing is minimized. On the other hand, a delivery fluid arising as discharge water is already removed from the pump housing away from the seal housing.
- the seal housing on a projection.
- this projects in the form of a shoulder encompassing the shaft on the inside of the seal housing.
- the paragraph serves as a centering for the seal housing with respect to the housing closing the pump housing. Due to the surface of the projection, the heat conduction-related contact surfaces are reduced to a strength necessary measure. The aim is to make this contact surface as small as possible in order to minimize the heat conduction from the housing cover into the seal housing.
- the housing cover also has a projection.
- the projection of the housing cover protrudes into the seal housing.
- the projection of the housing cover is also formed as a hollow cylinder surrounding the shaft. The seal housing is pushed onto the outer circumferential surface of the housing cover projection until the projection of the seal housing meets the housing cover.
- the projection of the seal housing and the projection of the housing cover are force-transmitting to each other and can overlap each other.
- the heat conduction between the parts is additionally reduced if a heat-insulating sealing element is positioned between the contact surface of the projection and the housing cover.
- the projection can also be an individual part in the form of a thermally insulating, centering and can be arranged between the seal housing and housing cover connecting element. This results in a greater combination ability of such a seal housing with different types of pumps. Likewise, as part of a pump revision, older pumps can be retrofitted and thus upgraded for another field of application.
- the seal housing is composed of an inner and an outer part.
- the inner part that surrounds the contacting seal is made of a different material than the outer part. It proves to be advantageous if the inner part is designed as a sleeve which is thermally conductively and force-transmittingly connected to the outer part, for example, it may be shrunk. It is also conceivable that the outer part is provided on its inside with a protective coating, plating or the like. In this case, the coating or plating forms the inner part of the seal housing.
- the outer part of the seal housing has a better thermal conductivity than the inner part. This allows the heat to be dissipated quickly to the outside. As low it has proven to form the outer part of the seal housing as a bronze body. But also others, good thermally conductive and resistant to the prevailing strength requirements materials are used.
- the inner part of the seal housing is preferably made of a material which is particularly resistant to corrosion by the fluid being conveyed.
- the inner part of the seal housing is formed by a stainless steel sleeve. This can be shrunk into the outer part, for example a bronze body.
- the stainless steel sleeve ensures corrosion resistance.
- the bronze body ensures that the heat from the seal chamber is sufficiently dissipated to the environment of the pump.
- the projection of the seal housing is formed by the inner part of the seal housing. Only the projection has a direct contact with the housing cover. Since the inner part of the seal housing is made of a material with a poor thermal conductivity, for example stainless steel, in this embodiment, the heat flow, which is transferred from the hot housing cover to the cool-seal housing, reduced in size. As a result, a better thermal decoupling of the seal housing is achieved by the housing cover.
- the housing cover is made of a material having a poor thermal conductivity. It has proved to be particularly advantageous to manufacture the housing cover made of an alloyed, chemically resistant, steel. It proves to be advantageous while a steel with the steel group number 45. But also other chemically resistant and poorly heat-conductive materials are used.
- the seal housing has ribs with axial channels formed therebetween.
- the channels are preferably arranged in the outer part of the seal housing and open to the seal housing.
- the channels can be milled into the seal housing become.
- a cheaper way to manufacture is to make the outer part of the housing as a casting, with ribs or recesses for the channels.
- the ribs can be attached to the seal housing individually, in groups or in the form of a ribbed body to transmit heat. This can be accomplished with shrink joints, connectors and other known techniques.
- the channels are preferably flowed through by air. It has proved to be favorable to position on a rotating part, in particular a coupling of the pump, a fan wheel, which promotes an air flow through the channels. So that the air also flows through the inner regions of the channels, it proves useful to surround the seal housing outside with baffles.
- the baffles can be attached to the seal housing. They surround the seal housing jacket-shaped and ensure that the air flow flows through the cross sections of the individual channels evenly.
- Fig. 1 is a section of a multi-stage centrifugal pump shown.
- the centrifugal pump comprises a pressure housing 1 and a stage housing 2.
- the wheels 3 are mounted on a shaft 4 and in their entirety form the rotor.
- the bearing of this rotor via radial bearings 5 and thrust bearing 6.
- An axial thrust of the rotor is collected by a discharge device 7.
- a discharge device 7 In principle, there are two different variants, such as a discharge water flowing from it can be removed according to the invention.
- a return line 8 runs for the discharge water in the pressure housing 1.
- the return line 8 runs in the housing cover 9 closing the pressure housing 1.
- the housing cover 9 seals against the pressure housing 1.
- an axial gap 11 is formed between the housing cover 9 and a shaft protection sleeve 10.
- the axial gap 11 acts as a throttle for the pump fluid in the pump housing and prevents larger amounts of fluid flow into the space 12 of the seal housing 13 flow.
- a mechanical seal 14 is disposed within the seal housing 13. Mechanical seals belong to the category of contact seals.
- the mechanical seal 14 consists of two low-wear rings.
- the sliding ring 15 rotates with the shaft 4 or with the shaft protection sleeve 10, while the counter-ring 16 bears firmly against the seal housing 13.
- the seal housing 13 consists of the inner part 18, which surrounds the mechanical seal 14 and an outer part 19.
- the outer part 19 is a bronze body.
- the inner part 18 is designed as a stainless steel sleeve which has shrunk into the outer part 19. The stainless steel sleeve 18 is needed to ensure corrosion resistance, while the bronze body 19 is primarily for heat dissipation.
- a fan wheel 21 On a coupling 20 which connects the pump to a drive, a fan wheel 21 is mounted, which blows air over the seal housing 13. The air flows through passages located between ribs of the outer part and dissipates the heat from the seal housing 13. For better air flow, the outer part 19 of the seal housing 13 is surrounded by a baffle 22.
- Fig. 2 From the perspective view of Fig. 2 the axial channels 23 in the outer part 19 of the seal housing 13 can be seen.
- the channels 23 are to the outer surface of the seal housing 13 open.
- the fan 21 blows air through the channels 23.
- baffle 27, see. Fig. 1 It is located on a shoulder 27 and improves the air flow in the channels 23. Between the baffle ends on the shoulder 27 and the housing cover 9, the channels are open and serve as an outlet for the cooling airflow.
- the guide plate 22 ensures the forced flow of air through the inner regions of the channels 23.
- the seal housing 13 has a projection 24 which is formed by the inner part 18 of the seal housing 13.
- the vertical circumferential surface 25 of the projection 24 serves as a contact surface of the seal housing 13 on the housing cover 9.
- the projection 26 of the housing cover 9 protrudes into the seal housing 13.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Die Erfindung betrifft eine Kreiselpumpe zur Förderung heißer Fluide, mit einer berührenden Wellenabdichtung, einem Dichtungsgehäuse für die Wellenabdichtung und einer Rückführleitung für einen Teilstrom des Förderfluids.The invention relates to a centrifugal pump for conveying hot fluids, with a contacting shaft seal, a seal housing for the shaft seal and a return line for a partial flow of the conveying fluid.
Eine solche Kreiselpumpe ist in der
Eine Kreiselpumpe mit einem Dichtungssystem für höhere Betriebstemperaturen wird in der
Eine Pumpe entsprechend dem Oberbegriff des ersten Anspruchs offenbart
Aufgabe der vorliegenden Erfindung ist es, eine mehrstufige Kreiselpumpe zur Verfügung zu stellen, bei der das Wellen-Dichtungssystem für einen über 160 °C hinausgehenden Temperaturbereich des Förderfluid ausgelegt ist und dass es für den gesamten Temperaturbereich von Speisepumpen eingesetzt werden kann. Weiterhin ist es ein Ziel der Erfindung, auf die Zuführung von externen Kühlfluiden in den Dichtungsraum zu verzichten und ein kostengünstiges, zuverlässiges Dichtungssystem zu schaffen.The object of the present invention is to provide a multi-stage centrifugal pump in which the shaft sealing system is designed for a temperature range of the conveying fluid exceeding 160 ° C. and that it can be used for the entire temperature range of feed pumps. Furthermore, it is an object of the invention to dispense with the supply of external cooling fluids in the seal chamber and to provide a cost-effective, reliable sealing system.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass sich das Dichtungsgehäuse aus einem inneren Teil und einem äußeren Teil zusammensetzt, wobei der innere Teil aus einem anderen Werkstoff besteht als der äußere Teil.This object is achieved in that the seal housing composed of an inner part and an outer part, wherein the inner part of a different material than the outer part.
Bei der erfindungsgemäßen Pumpe wird vorausgesetzt, dass aus dem Dichtungsgehäuse kein Förderfluid abgeführt wird, dass zwischen Dichtungsgehäuse und dem Pumpengehäuse ein separater Gehäusedeckel angeordnet ist, wobei zwischen dem Dichtungsgehäuse und dem Gehäusedeckel eine den Wärmeübergang minimierende Anlagefläche besteht und dass die Rückführleitung am Gehäusedeckel und/oder am Pumpengehäuse angeschlossen ist.In the case of the pump according to the invention, it is assumed that no delivery fluid is removed from the seal housing, that a separate housing cover is arranged between the seal housing and the pump housing, wherein a contact surface minimizing the heat transfer exists between the seal housing and the housing cover and that the return line on the housing cover and / or is connected to the pump housing.
Zwischen dem Gehäusedeckel und einem rotierenden Bauteil existiert ein Axialspalt.Between the housing cover and a rotating component exists an axial gap.
Bei dem rotierenden Bauteil kann es sich entweder um die Welle der Pumpe oder um eine Wellenschutzhülse handeln, die über die Pumpenwelle geschoben ist. Der Axialspalt erstreckt sich parallel zur Welle und läuft um die Welle herum. Geometrisch gesehen handelt es sich bei diesem Spalt um einen Hohlzylinder. Der Spalt drosselt den Zustrom des Pumpenförderfluids in den Dichtungsraum. Je enger und je länger der Spalt ist, desto weniger Entlastungswasser kann in das Dichtungsgehäuse eintreten. Vorzugsweise wird die Erfindung bei mehrstufigen Kreiselpumpen eingesetzt, bei denen die Kreiselpumpe eine Entlastungseinrichtung für den Axialschub aufweist, die berührende Wellenabdichtung der Entlastungseinrichtung nachgeordnet ist, wobei durch die Rückführleitung Entlastungswasser abgeführt wird. Die Rückführleitung für das Entlastungswasser stellt bei der Förderung heißer Fluide eine zusätzliche Wärmequelle dar, die einen negativen Einfluss auf die Wellenabdichtung ausüben kann. Erfindungsgemäß wurde der Anschluss für eine Rückführleitung für das Entlastungswasser entfernt vom Dichtungsgehäuse angeordnet. Somit kann die Wärme von der Rückführleitung nicht direkt an das Dichtungsgehäuse abgegeben werden.The rotating component may be either the shaft of the pump or a shaft sleeve pushed over the pump shaft. The axial gap extends parallel to the shaft and passes around the shaft. Geometrically, this gap is a hollow cylinder. The gap throttles the influx of the pump delivery fluid into the seal chamber. The narrower and the longer the gap, the less discharge water can enter the seal housing. Preferably, the invention is used in multi-stage centrifugal pumps, in which the centrifugal pump has a relief device for the axial thrust, the contacting shaft seal of the relief device is arranged downstream, being discharged through the return line discharge water. The return line for the discharge water is an additional source of heat when conveying hot fluids, which can exert a negative influence on the shaft seal. According to the invention, the connection for a return line for the discharge water has been arranged away from the seal housing. Thus, the heat from the return line can not be delivered directly to the seal housing.
Das neue Dichtungsgehäuse umschließt die berührende Abdichtung. Vorzugsweise handelt es sich bei der Abdichtung um eine Gleitringdichtung. Durch die Aufteilung in einen Gehäusedeckel und ein neues Dichtungsgehäuse wird eine thermische Abkopplung des Dichtungsraums gegenüber dem heißen Pumpengehäuse erreicht. Zum einen geschieht dies dadurch, dass die Wärmeleitung zwischen Gehäusedeckel und Dichtungsgehäuse minimiert wird. Zum anderen indem ein als Entlastungswasser anfallendes Förderfluid bereits entfernt vom Dichtungsgehäuses aus dem Pumpengehäuse abgeführt wird.The new seal housing encloses the touching seal. Preferably, the seal is a mechanical seal. The division into a housing cover and a new seal housing a thermal decoupling of the seal chamber is achieved with respect to the hot pump housing. On the one hand, this happens because the heat conduction between the housing cover and the seal housing is minimized. On the other hand, a delivery fluid arising as discharge water is already removed from the pump housing away from the seal housing.
In einer besonders vorteilhaften Ausführung der Erfindung weist das Dichtungsgehäuse einen Vorsprung auf. Vorzugsweise springt dieser in Form eines die Welle umgreifenden Absatzes an der Innenseite des Dichtungsgehäuses vor. Der Absatz dient als Zentrierung für das Dichtungsgehäuse gegenüber dem das Pumpengehäuse verschließenden Gehäusedeckel. Durch die Fläche des Vorsprunges werden die eine Wärmeleitung bedingenden Anlageflächen auf ein festigkeitsmäßiges notwendige Maß reduziert. Ziel ist es, diese Anlagefläche möglichst klein zu gestalten, um die Wärmeleitung vom Gehäusedeckel in das Dichtungsgehäuse zu minimieren.In a particularly advantageous embodiment of the invention, the seal housing on a projection. Preferably, this projects in the form of a shoulder encompassing the shaft on the inside of the seal housing. The paragraph serves as a centering for the seal housing with respect to the housing closing the pump housing. Due to the surface of the projection, the heat conduction-related contact surfaces are reduced to a strength necessary measure. The aim is to make this contact surface as small as possible in order to minimize the heat conduction from the housing cover into the seal housing.
Bei einer anderen besonders vorteilhaften Ausführungsform der Erfindung weist auch der Gehäusedeckel einen Vorsprung auf. Dabei ragt der Vorsprung des Gehäusedeckels in das Dichtungsgehäuse hinein. Der Vorsprung des Gehäusedeckels ist ebenfalls als Hohlzylinder ausgebildet, der die Welle umgibt. Das Dichtungsgehäuse wird auf die Außenmantelfläche des Gehäusedeckel-Vorsprungs aufgeschoben bis der Vorsprung des Dichtungsgehäuses auf den Gehäusedeckel trifft. Der Vorsprung des Dichtungsgehäuses und der Vorsprung des Gehäusedeckels liegen kräfteübertragend aneinander und können einander auch überlappen.In another particularly advantageous embodiment of the invention, the housing cover also has a projection. In this case, the projection of the housing cover protrudes into the seal housing. The projection of the housing cover is also formed as a hollow cylinder surrounding the shaft. The seal housing is pushed onto the outer circumferential surface of the housing cover projection until the projection of the seal housing meets the housing cover. The projection of the seal housing and the projection of the housing cover are force-transmitting to each other and can overlap each other.
Die Wärmeleitung zwischen den Teilen wird zusätzlich reduziert, wenn zwischen der Anlagefläche des Vorsprungs und dem Gehäusedeckel ein wärmeisolierendes Dichtungselement positioniert ist.The heat conduction between the parts is additionally reduced if a heat-insulating sealing element is positioned between the contact surface of the projection and the housing cover.
Der Vorsprung kann auch ein Einzelteil in Form eines thermisch isolierenden, zentrierenden und zwischen Dichtungsgehäuse und Gehäusedeckel anordbares Verbindungselements ausgebildet sein. Damit ergibt sich eine größere Kombinationsfähigkeit eines solchen Dichtungsgehäuses mit unterschiedlichen Pumpentypen. Ebenso können dadurch im Rahmen einer Pumpenrevision ältere Pumpen nachgerüstet und damit für einen anderen Einsatzbereich ertüchtigt werden.The projection can also be an individual part in the form of a thermally insulating, centering and can be arranged between the seal housing and housing cover connecting element. This results in a greater combination ability of such a seal housing with different types of pumps. Likewise, as part of a pump revision, older pumps can be retrofitted and thus upgraded for another field of application.
Im Sinne der Erfindung setzt sich das Dichtungsgehäuse aus einem inneren und einem äußeren Teil zusammen. Der innere Teil, der die berührende Abdichtung umgibt, besteht aus einem anderen Werkstoff als der äußere Teil. Als vorteilhaft erweist es sich, wenn der innere Teil als Hülse ausgebildet ist, die mit dem äußeren Teil wärmeleitend und kräfteübertragend verbunden ist, beispielsweise kann sie eingeschrumpft sein. Denkbar ist auch, dass das äußere Teil auf seiner Innenseite mit einer schützenden Beschichtung, Plattierung oder ähnlichen versehen ist. In diesem Fall bildet die Beschichtung oder Plattierung den inneren Teil des Dichtungsgehäuses.For the purposes of the invention, the seal housing is composed of an inner and an outer part. The inner part that surrounds the contacting seal is made of a different material than the outer part. It proves to be advantageous if the inner part is designed as a sleeve which is thermally conductively and force-transmittingly connected to the outer part, for example, it may be shrunk. It is also conceivable that the outer part is provided on its inside with a protective coating, plating or the like. In this case, the coating or plating forms the inner part of the seal housing.
Vorzugsweise weist der äußere Teil des Dichtungsgehäuses eine bessere Wärmeleitfähigkeit auf als der innere Teil. Dadurch kann die Wärme schnell nach außen abgeführt werden. Als günstig hat es sich dabei erwiesen, den äußeren Teil des Dichtungsgehäuses als Bronzekörper auszubilden. Aber auch andere, gut wärmeleitende und gegenüber den vorherrschenden Festigkeitsanforderungen beständige Materialien sind dazu verwendbar.Preferably, the outer part of the seal housing has a better thermal conductivity than the inner part. This allows the heat to be dissipated quickly to the outside. As low it has proven to form the outer part of the seal housing as a bronze body. But also others, good thermally conductive and resistant to the prevailing strength requirements materials are used.
Der innere Teil des Dichtungsgehäuses besteht vorzugsweise aus einem Material, das besonders korrosionsbeständig gegenüber dem Förderfluid ist. In einer vorteilhaften Ausführungsform der Erfindung wird der innere Teil des Dichtungsgehäuses von einer Edelstahlhülse gebildet. Diese kann in den äußeren Teil, beispielsweise einen Bronzekörper, eingeschrumpft werden. Die Edelstahlhülse gewährleistet die Korrosionsbeständigkeit. Der Bronzekörper sorgt dafür, dass die Wärme aus dem Dichtungsraum in ausreichendem Maße an die Umgebung der Pumpe abgeführt wird.The inner part of the seal housing is preferably made of a material which is particularly resistant to corrosion by the fluid being conveyed. In an advantageous embodiment of the invention, the inner part of the seal housing is formed by a stainless steel sleeve. This can be shrunk into the outer part, for example a bronze body. The stainless steel sleeve ensures corrosion resistance. The bronze body ensures that the heat from the seal chamber is sufficiently dissipated to the environment of the pump.
In einer besonders vorteilhaften Ausführungsform der Erfindung wird der Vorsprung des Dichtungsgehäuses durch den inneren Teil des Dichtungsgehäuses gebildet. Nur der Vorsprung hat einen direkten Kontakt zum Gehäusedeckel. Da der innere Teil des Dichtungsgehäuses aus einem Material mit einer schlechten Wärmeleitfähigkeit, beispielsweise Edelstahl, besteht, wird bei dieser Ausführungsform der Wärmestrom, welcher vom heißen Gehäusedeckel auf das kühl zu haltende Dichtungsgehäuse übertragen wird, verkleinert. Dadurch wird eine bessere thermische Entkopplung des Dichtungsgehäuses vom Gehäusedeckel erreicht.In a particularly advantageous embodiment of the invention, the projection of the seal housing is formed by the inner part of the seal housing. Only the projection has a direct contact with the housing cover. Since the inner part of the seal housing is made of a material with a poor thermal conductivity, for example stainless steel, in this embodiment, the heat flow, which is transferred from the hot housing cover to the cool-seal housing, reduced in size. As a result, a better thermal decoupling of the seal housing is achieved by the housing cover.
Um möglichst wenig Wärme in das Dichtungsgehäuse einzutragen, wird auch der Gehäusedeckel aus einem Material mit einer schlechten Wärmeleitfähigkeit gefertigt. Dabei hat es sich als besonders günstig erwiesen, den Gehäusedeckel aus einem legierten, chemisch beständigen, Stahl zu fertigen. Als vorteilhaft erweist sich dabei ein Stahl mit der Stahlgruppennummer 45. Aber auch andere chemisch beständige und schlecht wärmeleitende Materialien sind dazu verwendbar.In order to enter as little heat in the seal housing, the housing cover is made of a material having a poor thermal conductivity. It has proved to be particularly advantageous to manufacture the housing cover made of an alloyed, chemically resistant, steel. It proves to be advantageous while a steel with the steel group number 45. But also other chemically resistant and poorly heat-conductive materials are used.
Um die Wärme möglichst schnell vom Dichtungsgehäuse abzuführen, weist bei einer besonders vorteilhaften Ausführungsform der Erfindung das Dichtungsgehäuse Rippen mit dazwischen ausgebildeten axialen Kanälen auf. Die Kanäle sind dabei vorzugsweise im äußeren Teil des Dichtungsgehäuses angeordnet und zum Dichtungsgehäuse hin offen. Die Kanäle können in das Dichtungsgehäuse gefräst werden. Eine preiswertere Herstellungsart besteht darin, den äußeren Teil des Gehäuses als ein Gussteil, mit Rippen oder Aussparungen für die Kanäle, zu fertigen. Grundsätzlich ist es auch möglich die Kanäle dadurch zu bilden, dass man Rippen am Dichtungsgehäuse befestigt. Die Rippen können dazu am Dichtungsgehäuse einzeln, gruppenweise oder in Form eines verrippten Körpers wärmeübertragend befestigt sein. Dies kann mit Schrumpfverbindungen, Steckverbindungen und anderen bekannten Techniken verwirklicht werden.In order to dissipate the heat as quickly as possible from the seal housing, in a particularly advantageous embodiment of the invention, the seal housing has ribs with axial channels formed therebetween. The channels are preferably arranged in the outer part of the seal housing and open to the seal housing. The channels can be milled into the seal housing become. A cheaper way to manufacture is to make the outer part of the housing as a casting, with ribs or recesses for the channels. In principle, it is also possible to form the channels by attaching ribs to the seal housing. The ribs can be attached to the seal housing individually, in groups or in the form of a ribbed body to transmit heat. This can be accomplished with shrink joints, connectors and other known techniques.
Um die Wärme aus dem Dichtungsgehäuse möglichst schnell abzuführen, werden die Kanäle vorzugsweise von Luft durchströmt. Dabei hat es sich als günstig erwiesen, auf einem rotierenden Teil, insbesondere einer Kupplung der Pumpe, ein Lüfterrad zu positionieren, das einen Luftstrom durch die Kanäle fördert. Damit die Luft auch durch die inneren Bereiche der Kanäle strömt erweist es sich als zweckmäßig, das Dichtungsgehäuse außen mit Leitblechen zu umgeben. Die Leitbleche können dabei am Dichtungsgehäuse befestigt sein. Sie umgeben das Dichtungsgehäuse mantelförmig und sorgen dafür, dass die Luftströmung gleichmäßig die Querschnitte der einzelnen Kanäle durchströmt.To remove the heat from the seal housing as quickly as possible, the channels are preferably flowed through by air. It has proved to be favorable to position on a rotating part, in particular a coupling of the pump, a fan wheel, which promotes an air flow through the channels. So that the air also flows through the inner regions of the channels, it proves useful to surround the seal housing outside with baffles. The baffles can be attached to the seal housing. They surround the seal housing jacket-shaped and ensure that the air flow flows through the cross sections of the individual channels evenly.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der Beschreibung eines Ausführungsbeispiels anhand von zwei Zeichnungen und aus den Zeichnungen selbst.
Dabei zeigt
- Fig. 1
- einen Halbschnitt des druckseitigen Endes der Kreiselpumpe und
- Fig. 2
- eine 3-D Zeichnung des Dichtungsgehäuses mit Gehäusedeckel.
It shows
- Fig. 1
- a half-section of the pressure-side end of the centrifugal pump and
- Fig. 2
- a 3-D drawing of the seal housing with housing cover.
In
Zwischen dem Gehäusedeckel 9 und einer Wellenschutzhülse 10 ist ein Axialspalt 11 ausgebildet. Der Axialspalt 11 wirkt als Drossel für das im Pumpengehäuse befindliche Förderfluid und verhindert, dass größere Mengen an Förderfluid in den Raum 12 des Dichtungsgehäuses 13 fließen.Between the
Eine Gleitringdichtung 14 ist innerhalb des Dichtungsgehäuses 13 angeordnet. Gleitringdichtungen zählen zur Kategorie der berührenden Abdichtungen. Die Gleitringdichtung 14 besteht aus zwei verschleißarmen Ringen. Der Gleitring 15 läuft mit der Welle 4 beziehungsweise mit der Wellenschutzhülse 10 um, während der Gegenring 16 am Dichtungsgehäuse 13 fest anliegt. Durch eine Feder 17 werden Gleitring 15 und Gegenring 16 aneinander gedrückt.A
Das Dichtungsgehäuse 13 besteht aus dem inneren Teil 18, der die Gleitringdichtung 14 umgibt und einem äußeren Teil 19. Bei dem äußeren Teil 19 handelt es sich um einen Bronzekörper. Der innere Teil 18 ist als Edelstahlhülse ausgeführt, die in den äußeren Teil 19 eingeschrumpft ist. Die Edelstahlhülse 18 wird benötigt, um die Korrosionsbeständigkeit zu gewährleisten, während der Bronzekörper 19 primär der Wärmeabfuhr dient.The
Auf einer die Pumpe mit einem Antrieb verbindenden Kupplung 20 ist ein Lüfterrad 21 montiert, das Luft über das Dichtungsgehäuse 13 bläst. Die Luft strömt durch Kanäle, die zwischen Rippen des äußeren Teiles befindlich sind und führt die Wärme vom Dichtungsgehäuse 13 ab. Zur besseren Luftführung ist der äußere Teil 19 des Dichtungsgehäuses 13 von einem Leitblech 22 umgeben.On a
Aus der perspektivischen Ansicht der
Das Dichtungsgehäuse 13 weist einen Vorsprung 24 auf, der vom inneren Teil 18 des Dichtungsgehäuses 13 gebildet wird. Die vertikal umlaufende Fläche 25 des Vorsprungs 24 dient als Anlagefläche des Dichtungsgehäuses 13 am Gehäusedeckel 9. Zur Zentrierung des Dichtungsgehäuse 13 gegenüber dem Pumpengehäuse, der Welle 4 und dem Druckdeckel 9 ist in diesem Beispiel der innere Teil 18 mit seinem Vorsprung 24 auf einem im Durchmesser kleineren Vorsprung 26 des Gehäusedeckels 9 aufgeschoben. Dem Zusammenhalt von Dichtungsgehäuse 13 und Druckdeckel 9 dienen Verbindungsmittel 28.The
Der Vorsprung 26 des Gehäusedeckels 9 ragt in das Dichtungsgehäuse 13 hinein.The
Claims (16)
- Centrifugal pump for delivering hot fluids, having a contacting shaft seal (14) disposed in the region of a shaft lead-through, a seal housing for the shaft seal, and a return line (8) for a partial flow of the delivered fluid, wherein no delivered fluid is discharged from the seal housing (13), wherein a separate housing cover (9) is disposed between the seal housing (13) and the pump housing, wherein there is a contact surface (25) that minimizes the heat transfer between the seal housing (13) and the housing cover (9), and wherein the return line (8) is connected to the housing cover (9) and/or to the pump housing (1)
characterized in that
the seal housing (13) is composed of an inner part (18) and an outer part (19), the inner part (18) being composed of a different material than the outer part (19). - Device according to Claim 1, characterized in that a gap (11) between the fixed housing cover (9) and a rotating component (10) restricts the inflow of delivered fluid into the seal housing (13).
- Device according to Claim 1, characterized in that the centrifugal pump has a relief device (7) for the axial thrust and the contacting shaft seal (14) is disposed downstream of the relief device (7), relief water being discharged via the return line (8).
- Device according to Claim 1, characterized in that the seal housing (13) has a projection (24), a surface (25) of the projection (24) forming the contact surface on the housing cover (9).
- Device according to Claim 1, characterized in that the housing cover (9) has a projection (26), the projection (26) projecting into the seal housing (13).
- Device according to Claim 1, 4 or 5, characterized in that an insulating seal element is disposed between the housing cover (9) and the seal housing (13), in particular on the projection (26).
- Device according to Claim 4, 5 or 6, characterized in that the projection is disposed as a single part in the form of a thermally insulating and centering connecting element that can be disposed between the seal housing and the housing cover.
- Device according to Claim 1, characterized in that the outer part (19) has a better thermal conductivity than the inner part (18).
- Device according to Claim 1, characterized in that the inner part (18) is manufactured from a more corrosion-resistant material than the outer part (19).
- Device according to Claim 4, characterized in that the projection (24) is formed by the inner part (18).
- Device according to Claim 1, characterized in that the housing cover (9) is manufactured from a chemically resistant alloy steel.
- Device according to Claim 1, characterized in that the seal housing (13) has axial ducts (23).
- Device according to Claim 12, characterized in that the outer part (19) of the seal housing (13) has axial ducts (23).
- Device according to Claim 12, characterized in that the ducts (23) are open toward the outer lateral surface of the seal housing (13).
- Device according to one of Claims 1 to 14, characterized in that a fan impeller (21), which blows air through the seal housing (13), is positioned on a rotating part, in particular a coupling (20).
- Device according to one of Claims 1 to 15, characterized in that the seal housing (13) is surrounded by a baffle plate (22).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009023907A DE102009023907A1 (en) | 2009-06-04 | 2009-06-04 | Sealing system for centrifugal pumps |
PCT/EP2010/003210 WO2010139415A1 (en) | 2009-06-04 | 2010-05-26 | Sealing system for centrifugal pumps |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2438305A1 EP2438305A1 (en) | 2012-04-11 |
EP2438305B1 true EP2438305B1 (en) | 2016-01-13 |
Family
ID=42665226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10722626.8A Active EP2438305B1 (en) | 2009-06-04 | 2010-05-26 | Seal for rotary pump |
Country Status (7)
Country | Link |
---|---|
US (1) | US8870521B2 (en) |
EP (1) | EP2438305B1 (en) |
CN (1) | CN102803737B (en) |
DE (1) | DE102009023907A1 (en) |
ES (1) | ES2567263T3 (en) |
RU (1) | RU2556475C2 (en) |
WO (1) | WO2010139415A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2520777C1 (en) * | 2012-12-05 | 2014-06-27 | Общество с ограниченной ответственностью "Балтийские магистральные нефтепроводы" (ООО "Балтнефтепровод") | Pump rotor alignment with housing at main line pump unit mid-life repair |
CN106468287A (en) * | 2015-08-20 | 2017-03-01 | 宇航航天装备有限公司 | A kind of centrifugal pump specialized high-speed swivel joint |
WO2017100291A1 (en) | 2015-12-07 | 2017-06-15 | Fluid Handling Llc | Opposed impeller wear ring undercut to offset generated axial thrust in multi-stage pump |
RU2672238C1 (en) * | 2017-12-20 | 2018-11-12 | Общество с ограниченной ответственностью "Газпром трансгаз Ухта" | Method of centering unit of magnetic suspension sensor of the centrifugal blower of gas pumping unit |
US11218048B2 (en) | 2018-12-14 | 2022-01-04 | Nidec Motor Corporation | Shaft-mounted slinger for electric motor |
CN111852950A (en) * | 2020-07-21 | 2020-10-30 | 丹东克隆集团有限责任公司 | Mechanical sealing device for high-temperature hot water pump |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2221225A (en) * | 1938-04-16 | 1940-11-12 | Pacific Pump Works | Balancing and leakage device for centrifugal pumps |
DE903535C (en) * | 1944-05-24 | 1954-02-08 | Wesselinger Gusswerk Rheinguss | Centrifugal pump, especially for pumping corrosive fluids |
US3666375A (en) * | 1969-08-26 | 1972-05-30 | Ernest H Priest | Pumping a high or low temperature fluid |
US3999882A (en) * | 1975-03-17 | 1976-12-28 | Dresser Industries, Inc. | Flushing and cooling system for shaft seals and pumps |
DE2908733A1 (en) * | 1979-03-06 | 1980-09-11 | Gardena Kress & Kastner Gmbh | Portable pump-motor set - has plastics casing and walling separating suction and pressure chambers |
GB2071211A (en) * | 1980-02-22 | 1981-09-16 | Millington & Co Engs Ltd | Centrifugal pumps |
SU1251230A2 (en) * | 1981-10-06 | 1986-08-15 | Ярославский Электромашиностроительный Завод | Electric machine |
JPH0247314Y2 (en) * | 1987-06-26 | 1990-12-12 | ||
US4884945A (en) * | 1988-07-21 | 1989-12-05 | John Crane, Inc. | Dynamic seal arrangement for impeller pump |
DE4230715A1 (en) | 1992-09-14 | 1994-03-17 | Klein Schanzlin & Becker Ag | Relief water return |
US5624245A (en) * | 1994-10-26 | 1997-04-29 | Mp Pumps, Inc. | Centrufugal pump with thermally isolated and dynamically air cooled shaft seal assembly |
DE29503806U1 (en) * | 1995-03-06 | 1996-07-04 | Sihi GmbH & Co KG, 25524 Itzehoe | Pump for conveying hot media |
DE19518564A1 (en) | 1995-05-20 | 1996-11-21 | Klein Schanzlin & Becker Ag | Centrifugal pump for conveying hot media |
US6287074B1 (en) * | 1997-03-31 | 2001-09-11 | Nate International | Mechanical seal for shafts and axles |
US20080121384A1 (en) * | 2006-11-29 | 2008-05-29 | Po-Yung Tseng | Liquid cooled heat dissipator |
-
2009
- 2009-06-04 DE DE102009023907A patent/DE102009023907A1/en not_active Withdrawn
-
2010
- 2010-05-26 ES ES10722626.8T patent/ES2567263T3/en active Active
- 2010-05-26 CN CN201080024488.1A patent/CN102803737B/en active Active
- 2010-05-26 RU RU2011151762/06A patent/RU2556475C2/en not_active Application Discontinuation
- 2010-05-26 EP EP10722626.8A patent/EP2438305B1/en active Active
- 2010-05-26 WO PCT/EP2010/003210 patent/WO2010139415A1/en active Application Filing
-
2011
- 2011-12-02 US US13/310,540 patent/US8870521B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
DE102009023907A1 (en) | 2010-12-09 |
ES2567263T3 (en) | 2016-04-21 |
US20120076643A1 (en) | 2012-03-29 |
RU2011151762A (en) | 2013-07-20 |
RU2556475C2 (en) | 2015-07-10 |
CN102803737B (en) | 2016-03-16 |
WO2010139415A1 (en) | 2010-12-09 |
EP2438305A1 (en) | 2012-04-11 |
US8870521B2 (en) | 2014-10-28 |
CN102803737A (en) | 2012-11-28 |
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