US3366068A - Fluid circulation pump - Google Patents

Fluid circulation pump Download PDF

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Publication number
US3366068A
US3366068A US578660A US57866066A US3366068A US 3366068 A US3366068 A US 3366068A US 578660 A US578660 A US 578660A US 57866066 A US57866066 A US 57866066A US 3366068 A US3366068 A US 3366068A
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US
United States
Prior art keywords
partition wall
compartment
elastic partition
spring
rotor
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.)
Expired - Lifetime
Application number
US578660A
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English (en)
Inventor
Rye Ove
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.)
T Smedegaard AS
Original Assignee
T Smedegaard AS
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
Application filed by T Smedegaard AS filed Critical T Smedegaard AS
Application granted granted Critical
Publication of US3366068A publication Critical patent/US3366068A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0613—Special connection between the rotor compartments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/062—Canned motor pumps pressure compensation between motor- and pump- compartment
    • 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
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/602—Drainage
    • F05D2260/6022—Drainage of leakage having past a seal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/928—Seal including pressure relief or vent feature

Definitions

  • the present invention has reference to an improved fluid circulation pump assembly of the type wherein the rotor of an electric motor which drives the impeller of the pump is located in a rotor compartment surrounded by a split tube.
  • This rotor compartment is axially separated from the pressure compartment containing the impeller of the pump, and specificallyby means of an elastic partition wall, the radial inner marginal portion of which is provided with a sealing ring encircling the pump shaft with play, this sealing ring being axially retained by means of spring force against a suitable sealing ring rotating together with the pump shaft.
  • the rotor compartment upon simultaneous actuation of a venting element at the opposite end of the compartment, is filled with fluid pumped by the impeller of the pump, which fluid or liquid then serves as lubricating agent for the rotor bearings of the electric motor.
  • the pressure in the pressure compartment of the pump maintains the sealing ring located at the elastic partition wall, against the action of the spring force, spaced from the sealing ring of the shaft.
  • the elastic partition wall closes the sealing rings against one another. In this manner there is prevented that the liquid in the rotor compartment is continuously replenished which, in the case of a circulation pump for warm consumer water, brings about deposition of lime and impurities in the bearings of the rotor and renders frequent overhauling necessary.
  • the elastic partition wall Upon the appearance of temperature or pressure changes during operation of the pump the elastic partition wall compensates for small volume changes of the fluid or liquid in the rotor compartment which are brought about thereby. Should for any reason liquid become lost from the rotor compartment the spring force acting upon the elastic partition wall is overcome, so that both of the sealing rings are separated from one another and permit liquid to flow into the rotor compartment until such is again filled. It can also happen that for some reason the pressure in the rotor compartment, for instance due to an extraordinary temperature increase in the rotor compartment and the pressure compartment of the impeller, cannot be balanced or compensated by the elastic partition wall, and in order to prevent the risk that the partition wall will break it is therefore necessary to provide further measures.
  • a primary object of the present invention is to provide a teaching of how the elastic partition Wall can be designed to respond as protective arrangement or device in the presence of an overpressure in the rotor compartment without requiring further springs or a greater axial compartment or space.
  • Another important object of the present invention is to provide an improved fluid circulation pump which effectively responds to overpressure in the rotor compartment of the pump drive motor while overcoming the drawbacks of the prior art structures.
  • the inventive fluid circulation pump is characterized by the features that the radial external marginal or peripheral portion of the elastic partition wall is fixedly retained with respect to the rotor compartment, with the exception of at least one relatively short peripheral section or location which is constructed as check or counter-valve in such a manner that such is effectively opened when there appears a pressure difference in the opposite direction from that which brings about that both sealing rings separate from one another.
  • the position of the elastic partition wall is thereby insured, so that the sealing rings are always positioned properly in relation to one another, and the short peripheral section or sections of the marginal portion of the partition wall enable quick reactions even with a relatively small overpressure in the rotor compartment.
  • the elastic partition wall apart from the features of the invention, can be of optional type, for instance such as the known elastic partition Wall of substantially bellows shape as taught in the British Patent 631,981, and specifically, containing an enclosed helical pressure spring which encircles the pump shaft and which is arranged between the mechanical sealing ring located at the partition wall and the radial outer marginal portion of the bellows constructed as a flange.
  • the inventive pump is characterized by the fact that between the spring and the bellows flange there is arranged a preferably cup or dish-shaped spring impact disc or plate, the outer edge of which bearing against the flange is interrupted in front of the or those sections of the flange serving as check or counter valve.
  • the edge of the bellows at the interrupted locations of the edge of the spring disc will bow or arch and fluid can pass through the tunnel-shaped channels which are thereby formed.
  • the previously mentioned partition wall is manufactured from elastic material which should be able to give, whereas the spring serves to insure for mutual contact of the sealing rings.
  • a further known form of elastic partition wall comprises a primarily planar, circular, disc or plate-shaped membrane which is connected at its radial inner-marginal portion carrying the sealing ring with the inner edge of a corresponding blade or leaf spring.
  • Such partition walls are, among other things, employed when there exists limited space in axial direction.
  • the blade spring possesses, at least at one location of its periphery, primarily radially inwardly directed pairs of slits which extend inwardly toward the rotor compartment, and further, that the outer marginal portion of the blade spring, externally of this or these locations, is fixedly retained in known manner.
  • the portion of the blade spring situated between each pair of slits can then easily lift or raise and permit the throughflow of fluid from the rotor compartment without disturbing the remaining position of the partition wall.
  • the portion of the blade spring disposed between a pair of associated slits possesses a smaller external diameter than the remainder of the blade spring.
  • the fluid from the rotor compartment therefore, has associated with it a shorter path during flowing out, and additionally, there is provided the possibility of enclosing the entire path about the edge or margin of the elastic partition wall with an erect or vertical protective ring which can be simultaneously constructed as retaining means or support for the partition wall.
  • FIGURE 1 is a longitudinal sectional view of a first embodiment of inventive fluid circulation pump, taken through a portion of the pump;
  • FIGURE 2 is a longitudinal sectional view, similar to the illustration of FIGURE 1, of a further embodiment of inventive pump.
  • FIGURE 3 is a fragmentary view showing a detail of the embodiment of pump depicted in FIGURE 2.
  • FIGURES 1 and 2 the pump impeller is fixed to a pump shaft 11 revolving in two suitable bearings, of which the lower one is visible and designated by reference character 12. Between these bearings 12 the shaft 11 carries a non-illustrated rotor for an electric motor driving the pump. In the usual manner there is arranged about the rotor a split tube 13 or equivalent structure.
  • the compartment 14 within the split tube 13 will hereinafter convenienly be referred to as the rotor compartment, whereas the compartment or chamber 15 containing the impeller 10 will hereinafter be designated as the pressure compartment.
  • a channel or conduit 16 extends from the rotor compartment or chamber 14 to a chamber or compartment 17 which is separated from the pressure compartment 15 through the intermediary of an elastic partition wall means 18.
  • This partition wall means 18 carries a sealing ring 19 along the peripheral or marginal edge of the opening 18a encircling the pump shaft 11. Sealing ring 19 is normally biased by means of :a suitable spring 20 into contact with a suitable sealing ring 21 rotating together with the pump shaft 11. Now, when the pressure in the rotor compartment 14 falls below a predetermined value the pressure in the compartment 15 moves the sealing ring 19 of the partition wall 18 away from the sealing ring 21 of the pump shaft 11, so that fluid can flow into the rotor compartment 14.
  • FIG- URES 1 and 2 differ from one another only insofar as in the case of the embodiment of FIGURE 1 there is used for the spring 20 a helical spring, whereas in the other embodiment of FIGURE 2 such spring is a blade or leaf spring.
  • the helical or spiral spring 20 of FIGURE 1 requires more space in axial direction than the blade spring of FIGURE 2, and this helical spring also requires the use of a spring retainer or support 22 which, as shown to the right of FIGURE 1, has its outer peripheral edge 22a enclosed in the impact flange 23 of the elastic partition wall 18.
  • FIGURES 1 and 2 are depicted on the same scale, it will be clearly apparent how much space the helical spring 20 of FIGURE 1 requires. Moreover, in the event it is desired to reduce the axial expanse of the sealing arrangement it will be preferred to employ a blade or leaf spring which is possibly cup or dishshaped towards the top and approximately of the form of the depicted retainer 22, and to permit the partition wall to remain planar or to follow the curvature of the blade spring toward the top.
  • FIGURE 1 One of the most important aspects of the present invention will be ascertained by referring to the left side of FIGURES 1 and 2.
  • the marginal or peripheral portion 22a of the spring retainer 22 situated at the partition wall flange 23 is merely cut-away or removed at a short location in the peripheral direction.
  • the flange 23 at this location or path is pushed away from contact with the stationary portion of the pump housing H, so that the overpressure is balanced or compensated by the thereby formed tunnelshaped throughpassage.
  • the partition wall In the event the partition wall is of increased strength or thickness, then it can be necessary to provide it with holes or apertures which extend from the compartment 17 to the impact side of the flange.
  • the spring 20 does not have any influence upon pushing away of the partition wall flange 23.
  • the blade or leaf spring 20 is fixedly clamped along its outer edge or margin against the partition wall 18 which, in this case, does not have to be elastic in the normal sense, such as rubber, rather it can be very thin providing that it is fluid tight.
  • a suitable material for this purpose is Teflon or another suitable mold or formable material.
  • the blade spring 20 is provided with two slots or cuts 24 which extend inwardly from its periphery and which can be directed parallel or radially to the center of the blade spring.
  • cut-outs or slots 24 extend inwardly to such an extent that they terminate inside at the compartment 17.
  • the leg or flap means 25 of the blade spring 20 situated between the slots 24 will be able to bias away, and specifically, independently of the edges bordering at the blade spring.
  • This spring action can be rendered easier in that the leg or flap 25 is provided with a hole 26 or other apertures, so that there only remain narrow strips 2517 as the connection to the inwardly disposed portion of the blade spring 20.
  • the partition wall 18 covers these holes or apertures so that only fluid or liquid can pass the flaps or legs 25 along its peripheral edge 25a. As shown, this edge 25a can, if desired, be displaced or retracted somewhat inwardly with respect to the remaining edges of the blade spring 20, so that liquid begins to flow past immediately and the leg will only be moved or raised slightly. In this manner the entire arrangement becomes exceptionally sensitive and responds to a very small overpressure.
  • FIGURE 2 there is depicted an advantageous and simple manner .of fixedly clamping the blade spring 20 by means of a beaded or flanged-over annular edge 27 of a retainer or support 28 and which presses against the blade spring 20.
  • the flanged edge is removed or cut-away, so that the partition wall 18 and the flap or leg can, at this location, freely bend axially without being radially displaced.
  • a fluid circulation pump assembly of the type wherein the rotor of an electric motor driving the pump impeller is located in a rotor compartment enclosed by a tube means comprising, in combination, a pressure compartment, a pump impeller and a pump shaft for said pump impeller located in said pressure compartment, elastic partition wall means for separating said pressure compartment from the rotor compartment, said elastic partition wall means having a radial inner marginal portion, a sealing ring carried for rotation by said pump shaft, a spring-loaded sealing ring biased axially against said rotatable sealing ring and adapted to encircle the pump shaft with play carried by said radial inner marginal portion of saidelastic partition wall means, said elastic partition wall means having a radial outer marginal portion, a short peripheral section of said radial outer marginal portion of said elastic partition Wall means being constructed as counter valve means, said outer marginal portion of said elastic partition wall means with the exception of the short peripheral section being retained stationary with respect to said rotor compartment, said counter valve means operating in a manner that the latter is opened
  • said elastic partition wall means is constructed to possess the form of a primarily substantially planar, circular disc-shaped membrane, a corresponding blade spring means having a radial inner edge portion at which there is connected said radial inner marginal portion of said elastic partition wall means carrying said sealing ring, said blade spring means being provided at least at one location of its periphery with substantially radially inwardly directed pairs of slot means Which extend inwardly toward said rotor compartment, the outer marginal portion of said blade spring means externally of said location being fixedly retained.
  • a fluid circulation pump assembly comprising,
  • said elastic partition wall means separating said r0- tor compartment and said pressure compartment from one another, said elastic partition wall means being resiliently biased such that its sealing ring is brought into contact with said sealing ring of said pump shaft,
  • said elastic partition wall means at least at one portion of the periphery thereof being constructed to provide valve means which open upon the presence of a pressure difference which acts in a direction opposite from that which causes both of said sealing rings to move apart.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US578660A 1965-09-13 1966-09-12 Fluid circulation pump Expired - Lifetime US3366068A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK468565AA DK109243C (da) 1965-09-13 1965-09-13 Væskecirkulationspumpe.

Publications (1)

Publication Number Publication Date
US3366068A true US3366068A (en) 1968-01-30

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ID=8135776

Family Applications (1)

Application Number Title Priority Date Filing Date
US578660A Expired - Lifetime US3366068A (en) 1965-09-13 1966-09-12 Fluid circulation pump

Country Status (6)

Country Link
US (1) US3366068A (de)
AT (1) AT264297B (de)
BE (1) BE686820A (de)
CH (1) CH442998A (de)
DE (1) DE1528848B2 (de)
DK (1) DK109243C (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712756A (en) * 1971-07-22 1973-01-23 Gen Electric Centrifugally controlled flow modulating valve
JPS5131803U (de) * 1974-08-30 1976-03-08
FR2508563A1 (fr) * 1981-06-26 1982-12-31 Electro Hydraulique Seh Motopompe a moteur electrique a rotor noye
US4548547A (en) * 1982-12-24 1985-10-22 Goetze Ag Seal assembly, particularly for liquid pumps
WO1986000672A1 (en) * 1984-07-09 1986-01-30 Mici Limited Partnership Iv Centrifugal blood pump with tapered shaft seal
US4589822A (en) * 1984-07-09 1986-05-20 Mici Limited Partnership Iv Centrifugal blood pump with impeller
US4606698A (en) * 1984-07-09 1986-08-19 Mici Limited Partnership Iv Centrifugal blood pump with tapered shaft seal
US4753570A (en) * 1986-10-14 1988-06-28 Whirlpool Corporation Bidirectional pump with diaphragm operated valve for dishwasher
US5009570A (en) * 1989-05-02 1991-04-23 Maytag Corporation Mounting assembly for the impeller of a fluid pump
DE9210400U1 (de) * 1992-08-04 1993-09-02 Hanning Elektro-Werke GmbH & Co, 33813 Oerlinghausen Von einem Elektromotor angetriebene Umwälz- oder Entleerungspumpe für wasserführende Haushaltsmaschinen
DE19548471C1 (de) * 1995-12-22 1997-06-05 Grundfos As Umwälzpumpenaggregat
EP0928914A1 (de) * 1998-01-07 1999-07-14 WILO GmbH Kreiselmotorpumpe mit Gleitringdichtung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH532201A (de) * 1970-12-11 1972-12-31 Inventio Ag Schmier- und Filtereinrichtung für Umwälzpumpe
US4911609A (en) * 1986-09-29 1990-03-27 Muskin, Inc. Fluid pump
DE19620901C1 (de) * 1996-05-23 1997-08-21 Grundfos As Tauchmotor zum Antrieb einer Kreiselpumpe
US7264450B2 (en) * 2000-12-22 2007-09-04 Grundfos A/S Pump unit and method for operating a pump unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650117A (en) * 1950-01-19 1953-08-25 Garlock Packing Co Sealing device
US2881015A (en) * 1956-03-15 1959-04-07 Gits Bros Mfg Co Shaft seal means and method
GB811849A (en) * 1955-08-06 1959-04-15 Parkinson Cowan Appliances Ltd Improvements relating to pump impellers
US3007724A (en) * 1958-12-10 1961-11-07 Amirault Maxime Shaft packing
US3137237A (en) * 1961-08-22 1964-06-16 Wilfley & Sons Inc A Pump sealing apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650117A (en) * 1950-01-19 1953-08-25 Garlock Packing Co Sealing device
GB811849A (en) * 1955-08-06 1959-04-15 Parkinson Cowan Appliances Ltd Improvements relating to pump impellers
US2881015A (en) * 1956-03-15 1959-04-07 Gits Bros Mfg Co Shaft seal means and method
US3007724A (en) * 1958-12-10 1961-11-07 Amirault Maxime Shaft packing
US3137237A (en) * 1961-08-22 1964-06-16 Wilfley & Sons Inc A Pump sealing apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712756A (en) * 1971-07-22 1973-01-23 Gen Electric Centrifugally controlled flow modulating valve
JPS5131803U (de) * 1974-08-30 1976-03-08
JPS5548145Y2 (de) * 1974-08-30 1980-11-11
FR2508563A1 (fr) * 1981-06-26 1982-12-31 Electro Hydraulique Seh Motopompe a moteur electrique a rotor noye
EP0068948A1 (de) * 1981-06-26 1983-01-05 Societe Electro-Hydraulique Seh Elektrisch angetriebene Motorpumpe mit Tauchrotor
US4548547A (en) * 1982-12-24 1985-10-22 Goetze Ag Seal assembly, particularly for liquid pumps
WO1986000672A1 (en) * 1984-07-09 1986-01-30 Mici Limited Partnership Iv Centrifugal blood pump with tapered shaft seal
US4589822A (en) * 1984-07-09 1986-05-20 Mici Limited Partnership Iv Centrifugal blood pump with impeller
US4606698A (en) * 1984-07-09 1986-08-19 Mici Limited Partnership Iv Centrifugal blood pump with tapered shaft seal
US4753570A (en) * 1986-10-14 1988-06-28 Whirlpool Corporation Bidirectional pump with diaphragm operated valve for dishwasher
US5009570A (en) * 1989-05-02 1991-04-23 Maytag Corporation Mounting assembly for the impeller of a fluid pump
DE9210400U1 (de) * 1992-08-04 1993-09-02 Hanning Elektro-Werke GmbH & Co, 33813 Oerlinghausen Von einem Elektromotor angetriebene Umwälz- oder Entleerungspumpe für wasserführende Haushaltsmaschinen
DE19548471C1 (de) * 1995-12-22 1997-06-05 Grundfos As Umwälzpumpenaggregat
EP0928914A1 (de) * 1998-01-07 1999-07-14 WILO GmbH Kreiselmotorpumpe mit Gleitringdichtung

Also Published As

Publication number Publication date
CH442998A (de) 1967-08-31
AT264297B (de) 1968-08-26
BE686820A (de) 1967-02-15
DE1528848B2 (de) 1971-12-02
DK109243C (da) 1968-04-01
DE1528848A1 (de) 1970-09-17

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