EP1318312A2 - Shaft sealing system for rotary shafts on pumps - Google Patents

Shaft sealing system for rotary shafts on pumps Download PDF

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Publication number
EP1318312A2
EP1318312A2 EP02027126A EP02027126A EP1318312A2 EP 1318312 A2 EP1318312 A2 EP 1318312A2 EP 02027126 A EP02027126 A EP 02027126A EP 02027126 A EP02027126 A EP 02027126A EP 1318312 A2 EP1318312 A2 EP 1318312A2
Authority
EP
European Patent Office
Prior art keywords
shaft
chamber
shaft sealing
sealing system
cooling
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.)
Withdrawn
Application number
EP02027126A
Other languages
German (de)
French (fr)
Other versions
EP1318312A3 (en
Inventor
Stefan Leuchtenberger
Klaus Engels
Roland Fach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Venator Germany GmbH
Original Assignee
Sachtleben Chemie GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE10254281A external-priority patent/DE10254281A1/en
Application filed by Sachtleben Chemie GmbH filed Critical Sachtleben Chemie GmbH
Publication of EP1318312A2 publication Critical patent/EP1318312A2/en
Publication of EP1318312A3 publication Critical patent/EP1318312A3/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F04D29/106—Shaft sealings 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
    • 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
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine

Definitions

  • the invention relates to a shaft sealing system for rotating shafts Pumps according to the preamble of claim 1.
  • Circulation pumps are e.g. B. in the chemical industry to promote and / or Circulation of sometimes aggressive media used. So z. B. in one Thin acid recovery plant according to EP 0 476 744 B1 70% sulfuric acid circulated at a temperature of 120 ° C.
  • a mechanical seal consists of two main elements with flat radial ones Sealing surfaces. One part rotates with the shaft, the other is stationary. The sealing effect is due to the direct contact of the flat sealing surfaces reached.
  • the flexibility of the slide ring is ensured by a flexible secondary seal, z. B. bellows or O-ring.
  • the sealing effect of a mechanical seal is determined by the spring force and the operating pressure generated, press the slide ring and counter ring together. If too low Leakage occurs when there is excessive wear.
  • the pressure as well as the sealing width are taking into account the property of the medium to be sealed.
  • the invention is based, a shaft sealing system for the task rotating shafts on pumps according to the preamble of claim 1 improve that the life of the mechanical seals is significantly improved is.
  • this object is achieved in that between the Pump delivery chamber and the shaft seal chamber concentric around the shaft arranged cold room is located.
  • a cooling liquid is advantageously conveyed through the cooling space, wherein the coolant is the one pumped or pumped and the medium to be pumped is a compatible medium.
  • the cooling system of the cooling liquid can advantageously be a temperature and Pressure monitoring included. If a continuous flow is desired, the A choke for pressure build-up can be arranged on the outlet side of the cooling space. Otherwise known devices for cooling the cooling liquid can be used become.
  • the pump has no hydrodynamic shaft seal on.
  • the hydrodynamic required for this and used according to the prior art Shaft sealing chamber between pump delivery chamber and shaft sealing chamber, is advantageously used as a cold room.
  • This cooling chamber also has a split ring seal to the pump delivery chamber on.
  • the cooling space is advantageously turned into a shaft sealing space by means of a Mechanical seal sealed. This has the advantage that large volume flows at hot temperatures greater than or equal to 80 ° C, as well as corrosive and aggressive Media can be sealed.
  • the pressure of the cooling liquid in the cooling space is advantageously greater than that of the pumped medium in the pump delivery chamber.
  • a throttle section arranged in the transition area from the pump delivery chamber to the cooling chamber. This can be an annular gap.
  • this mechanical seal is in the shaft seal space a double-acting mechanical seal.
  • the temperature load of the mechanical seal is due to the cooling space according to the invention significantly reduced in the shaft seal chamber, so that the service life the mechanical seal is increased.
  • the single figure shows more schematically the essential elements of an inventive Shaft sealing system for rotating shafts 1 on pumps for aggressive media, such as B. sulfuric acid.
  • pumps for aggressive media such as B. sulfuric acid.
  • Such pumps are also called circulation pumps.
  • the reference number 8 denotes a pump housing in which a Impeller 3 is arranged to circulate the medium.
  • This impeller 3 is attached to the shaft 1 through the pump delivery chamber 2 and through a inventive cooling space 6 and subsequent shaft sealing space 4th leads to the engine (not shown).
  • a split ring seal 7 or a throttle section is to seal the pump delivery chamber 2 to Cooling space.
  • the cooling space 6 is from the shaft seal space 4 via a mechanical seal 5 sealed, which in this case is a double-acting mechanical seal.
  • Breakthrough 11 is provided, through which the cooling liquid enters the cooling space 6.
  • the outflow of the cooling space 6 is not shown in this figure however, at the lower end of the cooling space 6, at the opposite end from breakthrough 11
  • the supply for the medium to act upon the mechanical seal 5 at a standstill the pump is not shown here for simplicity because it is not essential is for the invention.
  • the cooling space 6 consists of different chambers 6a, 6b, which have a Gap seal 12 are interconnected.
  • the coolant must definitely be colder than the medium being pumped be in the pump delivery chamber. It should be aimed at by cooling that the mechanical seal 5 has a temperature below 80 ° C.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Mechanical Sealing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The shaft (1) has a rotor (3) fastened to it in the pump feed chamber (2), and a slide ring seal (5) in the shaft sealing chamber (4). A concentric cooling chamber (6) with coolant flowing through it, is located around the shaft between the chambers. The coolant is the medium conveyed by the pump, or a medium compatible with pump and conveyed medium. The pressure of the coolant in the cooling chamber is higher than that of the conveyed medium in the pump feed chamber.

Description

Die Erfindung betrifft ein Wellenabdichtungssystem für rotierende Wellen an Pumpen nach dem Oberbegriff des Anspruchs 1.The invention relates to a shaft sealing system for rotating shafts Pumps according to the preamble of claim 1.

Umwälzpumpen werden z. B. in der chemischen Industrie zum Fördern und/oder Umwälzen von zum Teil aggressiven Medien verwendet. So wird z. B. in einer Dünnsäure-Rückgewinnungsanlage nach der EP 0 476 744 B1 70%ige Schwefelsäure mit einer Temperatur von 120°C umgewälzt.Circulation pumps are e.g. B. in the chemical industry to promote and / or Circulation of sometimes aggressive media used. So z. B. in one Thin acid recovery plant according to EP 0 476 744 B1 70% sulfuric acid circulated at a temperature of 120 ° C.

Da durch diese aggressiven Medien alle Pumpenteile einer starken Belastung unterworfen sind, müssen diese Pumpen öfters gewartet und repariert werden. Hierzu ist die Pumpe abzustellen. Es muss hierbei sichergestellt sein, dass bei Betrieb und Stillstand der Pumpenwelle keine aggressiven Medien aus der Pumpe austreten können. Aus diesem Grund ist im Wellendichtungsraum eine Wellendichtung eingebaut. Diese Wellendichtung wird auch als Gleitringdichtung bezeichnet.As this aggressive media means that all pump parts are under a heavy load these pumps have to be serviced and repaired frequently. The pump must be switched off for this. It must be ensured that at Operation and standstill of the pump shaft no aggressive media from the pump can exit. For this reason there is a shaft seal in the shaft seal chamber built-in. This shaft seal is also called a mechanical seal designated.

Eine Gleitringdichtung besteht aus zwei Hauptelementen mit planen radialen Dichtflächen. Ein Teil rotiert mit der Welle, das zweite ist stationär angeordnet. Die Dichtwirkung wird durch den unmittelbaren Kontakt der planen Dichtflächen erreicht. Eine der Dichtflächen, der Gleitring, ist axial und radial beweglich angeordnet, um die im Betrieb auftretenden Wellenauslenkungen ausgleichen zu können. Die Beweglichkeit des Gleitrings wird durch eine flexible Sekundärdichtung, z. B. Faltenbalg oder O-Ring, erzielt.A mechanical seal consists of two main elements with flat radial ones Sealing surfaces. One part rotates with the shaft, the other is stationary. The sealing effect is due to the direct contact of the flat sealing surfaces reached. One of the sealing surfaces, the slide ring, is axially and radially movable, in order to be able to compensate for the shaft deflections that occur during operation. The flexibility of the slide ring is ensured by a flexible secondary seal, z. B. bellows or O-ring.

Die Dichtwirkung einer Gleitringdichtung wird durch die Federkraft und den Betriebsdruck erzeugt, die Gleitring und Gegenring aneinander pressen. Bei zu geringer Anpressung tritt Leckage auf, bei zu starker großer Verschleiß. Die Anpressung wie auch die Dichtbreite werden unter Berücksichtigungen der Eigenschaft des abzudichtenden Mediums bestimmt. The sealing effect of a mechanical seal is determined by the spring force and the operating pressure generated, press the slide ring and counter ring together. If too low Leakage occurs when there is excessive wear. The pressure as well as the sealing width are taking into account the property of the medium to be sealed.

Nachteilig an diesen Gleitringdichtungen ist ihre Temperaturempfindlichkeit, so dass sie oft ausgewechselt werden müssen. Dieses Auswechseln ist mit hohen Reparaturkosten verbunden.A disadvantage of these mechanical seals is their temperature sensitivity, so that they have to be replaced often. This replacement is high Repair costs associated.

Der Erfindung liegt die Aufgabe zu Grunde, ein Wellenabdichtungssystem für rotierende Wellen an Pumpen nach dem Oberbegriff des Anspruchs 1 so zu verbessern, dass die Lebensdauer der Gleitringdichtungen wesentlich verbessert ist.The invention is based, a shaft sealing system for the task rotating shafts on pumps according to the preamble of claim 1 improve that the life of the mechanical seals is significantly improved is.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass sich zwischen dem Pumpenförderraum und dem Wellendichtungsraum ein um die Welle konzentrisch angeordneter Kühlraum befindet.According to the invention this object is achieved in that between the Pump delivery chamber and the shaft seal chamber concentric around the shaft arranged cold room is located.

Vorteilhafterweise wird durch den Kühlraum eine Kühlflüssigkeit gefördert, wobei die Kühlflüssigkeit das von der Pumpe geförderte oder ein mit der Pumpe und dem zu fördernden Medium, verträgliches Medium ist.A cooling liquid is advantageously conveyed through the cooling space, wherein the coolant is the one pumped or pumped and the medium to be pumped is a compatible medium.

Das Kühlsystem der Kühlflüssigkeit kann vorteilhafterweise eine Temperatur- und Drucküberwachung enthalten. Ist ein Dauerdurchfluss gewünscht, kann an der Auslaufseite des Kühlraums eine Drossel zum Druckaufbau angeordnet sein. Ansonsten können bekannte Vorrichtungen zum Kühlen der Kühlflüssigkeit verwendet werden.The cooling system of the cooling liquid can advantageously be a temperature and Pressure monitoring included. If a continuous flow is desired, the A choke for pressure build-up can be arranged on the outlet side of the cooling space. Otherwise known devices for cooling the cooling liquid can be used become.

Erfindungsgemäß weist die Pumpe keine hydrodynamische Wellenabdichtung auf. Der hierfür erforderliche und nach dem Stand der Technik eingesetzte hydrodynamische Wellenabdichtungsraum zwischen Pumpenförderraum und Wellenabdichtungsraum, wird jedoch vorteilhafterweise als Kühlraum verwendet. Dieser Kühlraum weist auch eine Spaltringabdichtung zum Pumpenförderraum auf.According to the invention, the pump has no hydrodynamic shaft seal on. The hydrodynamic required for this and used according to the prior art Shaft sealing chamber between pump delivery chamber and shaft sealing chamber, is advantageously used as a cold room. This cooling chamber also has a split ring seal to the pump delivery chamber on.

Vorteilhafterweise wird der Kühlraum zum Wellendichtungsraum mittels einer Gleitringdichtung abgedichtet. Dies hat den Vorteil, dass große Volumenströme bei heißen Temperaturen größer gleich 80 °C, sowie korrosiven und aggressiven Medien abgedichtet werden können.The cooling space is advantageously turned into a shaft sealing space by means of a Mechanical seal sealed. This has the advantage that large volume flows at hot temperatures greater than or equal to 80 ° C, as well as corrosive and aggressive Media can be sealed.

Vorteilhafterweise ist der Druck der Kühlflüssigkeit im Kühlraum größer als der des geförderten Mediums im Pumpenförderraum.The pressure of the cooling liquid in the cooling space is advantageously greater than that of the pumped medium in the pump delivery chamber.

Im Übergangsbereich vom Pumpenförderraum zum Kühlraum ist erfindungsgemäß eine Drosselstrecke angeordnet. Dies kann ein Ringspalt sein.In the transition area from the pump delivery chamber to the cooling chamber is according to the invention a throttle section arranged. This can be an annular gap.

An dem dem Pumpenförderungsraum entgegengesetzten Ende des Kühlraums geht dieser in die Gleitringdichtung über bzw. ist durch diese abgedichtet.At the end of the cooling chamber opposite the pump delivery chamber this passes into the mechanical seal or is sealed by this.

In bevorzugter Ausführungsform ist diese Gleitringdichtung im Wellendichtungsraum eine doppelt wirkende Gleitringdichtung.In a preferred embodiment, this mechanical seal is in the shaft seal space a double-acting mechanical seal.

Durch den erfindungsgemäßen Kühlraum ist die Temperaturbelastung der Gleitringdichtung im Wellendichtungsraum wesentlich herabgesetzt, so dass die Lebensdauer der Gleitringdichtung erhöht ist.The temperature load of the mechanical seal is due to the cooling space according to the invention significantly reduced in the shaft seal chamber, so that the service life the mechanical seal is increased.

Weitere Merkmale der Erfindung ergeben sich aus der Figur, die nachfolgend beschreiben ist.Further features of the invention emerge from the figure, which follows is to describe.

Die einzige Figur zeigt mehr schematisch die wesentlichen Elemente eines erfindungsgemäßen Wellenabdichtungssystems für rotierende Wellen 1 an Pumpen für aggressive Fördermedien, wie z. B. Schwefelsäure. Derartige Pumpen werden auch als Umwälzpumpen bezeichnet.The single figure shows more schematically the essential elements of an inventive Shaft sealing system for rotating shafts 1 on pumps for aggressive media, such as B. sulfuric acid. Such pumps are also called circulation pumps.

Mit dem Bezugszeichen 8 ist ein Pumpengehäuse gekennzeichnet, in dem ein Laufrad 3 zum Umwälzen des Fördermediums angeordnet ist. Dieses Laufrad 3 ist auf der Welle 1 befestigt, die durch den Pumpenförderraum 2 und über einen erfindungsgemäßen Kühlraum 6 und anschließenden Wellendichtungsraum 4 zum Motor (nicht gezeigt) führt. Zur Abdichtung des Pumpenförderraumes 2 zum Kühlraum ist eine Spaltringabdichtung 7 bzw. eine Drosselstrecke angeordnet.The reference number 8 denotes a pump housing in which a Impeller 3 is arranged to circulate the medium. This impeller 3 is attached to the shaft 1 through the pump delivery chamber 2 and through a inventive cooling space 6 and subsequent shaft sealing space 4th leads to the engine (not shown). To seal the pump delivery chamber 2 to Cooling space is a split ring seal 7 or a throttle section.

Der Kühlraum 6 ist vom Wellendichtungsraum 4 über eine Gleitringdichtung 5 abgedichtet, die in diesem Falle eine doppelt wirkende Gleitringdichtung ist.The cooling space 6 is from the shaft seal space 4 via a mechanical seal 5 sealed, which in this case is a double-acting mechanical seal.

In der Trennwand 10 zwischen Kühlraum 6 und Wellendichtungsraum 4 ist ein Durchbruch 11 vorgesehen, über den die Kühlflüssigkeit in den Kühlraum 6 gelangt. Der Abfluss des Kühlraumes 6 ist in dieser Figur nicht gezeigt, befindet sich jedoch am unteren Ende des Kühlraumes 6, am entgegengesetzten Ende vom Durchbruch 11.In the partition 10 between the cooling space 6 and the shaft sealing space 4 is a Breakthrough 11 is provided, through which the cooling liquid enters the cooling space 6. The outflow of the cooling space 6 is not shown in this figure however, at the lower end of the cooling space 6, at the opposite end from breakthrough 11

Die Zufuhr für das Medium zur Beaufschlagung der Gleitringdichtung 5 bei Stillstand der Pumpe ist hier der Einfachheit halber nicht gezeigt, weil es nicht wesentlich für die Erfindung ist.The supply for the medium to act upon the mechanical seal 5 at a standstill the pump is not shown here for simplicity because it is not essential is for the invention.

Der Kühlraum 6 besteht aus verschiedenen Kammern 6a, 6b, die über eine Spaltdichtung 12 miteinander verbunden sind.The cooling space 6 consists of different chambers 6a, 6b, which have a Gap seal 12 are interconnected.

Ebenfalls nicht gezeigt ist die Steuerung der Zufuhr der Kühlflüssigkeit für den Kühlraum 6. Die Kühlflüssigkeit muss auf jeden Fall kälter als das geförderte Medium im Pumpenförderraum sein. Es sollte durch die Kühlung angestrebt werden, dass die Gleitringdichtung 5 eine Temperatur unterhalb 80 °C aufweist.Also not shown is the control of the supply of the coolant for the Cold room 6. The coolant must definitely be colder than the medium being pumped be in the pump delivery chamber. It should be aimed at by cooling that the mechanical seal 5 has a temperature below 80 ° C.

Claims (7)

Wellenabdichtungssystem für rotierende Wellen (1) an Pumpen mit einem im Pumpenförderraum (2) auf der Welle (1) befestigten Laufrad (3) und einer im Wellendichtungsraum (4) angeordneten Gleitringdichtung (5), dadurch gekennzeichnet, dass sich zwischen dem Pumpenförderraum (2) und dem Wellendichtungsraum (4) ein um die Welle (1) konzentrisch angeordneter Kühlraum (6) befindet.Shaft sealing system for rotating shafts (1) on pumps with an impeller (3) attached to the shaft (1) in the pump delivery chamber (2) and a mechanical seal (5) arranged in the shaft seal chamber (4), characterized in that between the pump delivery chamber (2 ) and the shaft seal chamber (4) is a cooling chamber (6) concentrically arranged around the shaft (1). Wellenabdichtungssystem nach Anspruch 1, dadurch gekennzeichnet, dass durch den Kühlraum (6) eine Kühlflüssigkeit gefördert wird.Shaft sealing system according to claim 1, characterized in that a cooling liquid is conveyed through the cooling space (6). Wellenabdichtungssystem nach Anspruch 2, dadurch gekennzeichnet, dass die Kühlflüssigkeit das von der Pumpe geförderte oder ein mit der Pumpe und dem zu fördernden Medium verträgliches Medium ist.Shaft sealing system according to claim 2, characterized in that the cooling liquid is the medium conveyed by the pump or a medium compatible with the pump and the medium to be conveyed. Wellenabdichtungssystem nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Kühlraum (6), der nach dem Stand der Technik ein eingesetzter hydrodynamischer Wellenabdichtungsraum ist, eine Spaltringabdichtung (7) zum Pumpenförderraum (2) aufweist.Shaft sealing system according to one of claims 1 to 3, characterized in that the cooling chamber (6), which according to the prior art is a hydrodynamic shaft sealing chamber, has a split ring seal (7) to the pump delivery chamber (2). Wellenabdichtungssystem nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der Druck der Kühlflüssigkeit im Kühlraum (6) größer als der des geförderten Mediums im Pumpenförderraum (2) ist.Shaft sealing system according to one of claims 2 to 4, characterized in that the pressure of the cooling liquid in the cooling chamber (6) is greater than that of the medium conveyed in the pump delivery chamber (2). Wellenabdichtungssystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Gleitringdichtung (5) im Wellendichtungsraum (4) eine doppelt wirkende Gleitringdichtung ist.Shaft sealing system according to one of claims 1 to 5, characterized in that the mechanical seal (5) in the shaft seal space (4) is a double-acting mechanical seal. Wellenabdichtungssystem nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass im Übergangsbereich vom Pumpenförderraum (2) zum Kühlraum (6) eine Drosselstrecke angeordnet ist.Shaft sealing system according to one of claims 1 to 6, characterized in that a throttle section is arranged in the transition area from the pump delivery chamber (2) to the cooling chamber (6).
EP02027126A 2001-12-06 2002-12-04 Shaft sealing system for rotary shafts on pumps Withdrawn EP1318312A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10159938 2001-12-06
DE10159938 2001-12-06
DE10254281A DE10254281A1 (en) 2001-12-06 2002-11-20 Shaft sealing system for rotating shafts on pumps
DE10254281 2002-11-20

Publications (2)

Publication Number Publication Date
EP1318312A2 true EP1318312A2 (en) 2003-06-11
EP1318312A3 EP1318312A3 (en) 2005-06-22

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EP02027126A Withdrawn EP1318312A3 (en) 2001-12-06 2002-12-04 Shaft sealing system for rotary shafts on pumps

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7438519B2 (en) 2004-09-07 2008-10-21 John Crane Inc. Sealing system for slurry pump
CN104329261A (en) * 2014-10-22 2015-02-04 江苏振华泵业制造有限公司 High temperature distilled water circulating pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100535450C (en) * 2006-05-12 2009-09-02 项光辉 Cooling smart controlled water pump

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB724510A (en) * 1953-10-26 1955-02-23 La Mont Int Ass Ltd Improvements in or relating to shaft sealing means for boiler circulating pumps
US3554661A (en) * 1968-12-20 1971-01-12 Decatur Pump Co High temperature pump
DE3136721A1 (en) * 1981-09-16 1983-03-31 Klein, Schanzlin & Becker Ag, 6710 Frankenthal METHOD FOR AVOIDING SHAFT INTERVENTIONS IN HORIZONTAL CENTRIFUGAL PUMPS FOR CONVEYING HOT MEDIA AND DEVICES FOR IMPLEMENTING THE METHOD
DE3404964A1 (en) * 1984-02-11 1985-08-14 Allweiler Ag, 7760 Radolfzell Shaft seal
US4932836A (en) * 1988-06-10 1990-06-12 Bw/Ip International, Inc. Pump with heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB724510A (en) * 1953-10-26 1955-02-23 La Mont Int Ass Ltd Improvements in or relating to shaft sealing means for boiler circulating pumps
US3554661A (en) * 1968-12-20 1971-01-12 Decatur Pump Co High temperature pump
DE3136721A1 (en) * 1981-09-16 1983-03-31 Klein, Schanzlin & Becker Ag, 6710 Frankenthal METHOD FOR AVOIDING SHAFT INTERVENTIONS IN HORIZONTAL CENTRIFUGAL PUMPS FOR CONVEYING HOT MEDIA AND DEVICES FOR IMPLEMENTING THE METHOD
DE3404964A1 (en) * 1984-02-11 1985-08-14 Allweiler Ag, 7760 Radolfzell Shaft seal
US4932836A (en) * 1988-06-10 1990-06-12 Bw/Ip International, Inc. Pump with heat exchanger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7438519B2 (en) 2004-09-07 2008-10-21 John Crane Inc. Sealing system for slurry pump
CN104329261A (en) * 2014-10-22 2015-02-04 江苏振华泵业制造有限公司 High temperature distilled water circulating pump

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