EP0192621B1 - A seal device - Google Patents

A seal device Download PDF

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Publication number
EP0192621B1
EP0192621B1 EP86850033A EP86850033A EP0192621B1 EP 0192621 B1 EP0192621 B1 EP 0192621B1 EP 86850033 A EP86850033 A EP 86850033A EP 86850033 A EP86850033 A EP 86850033A EP 0192621 B1 EP0192621 B1 EP 0192621B1
Authority
EP
European Patent Office
Prior art keywords
ring
seal
slot
impeller
housing
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
EP86850033A
Other languages
German (de)
French (fr)
Other versions
EP0192621A1 (en
Inventor
Evert Sjöstrand
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.)
Xylem Water Solutions AB
Original Assignee
Flygt AB
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 Flygt AB filed Critical Flygt AB
Publication of EP0192621A1 publication Critical patent/EP0192621A1/en
Application granted granted Critical
Publication of EP0192621B1 publication Critical patent/EP0192621B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel

Definitions

  • This invention concerns a seal device as claimed in claim 1 to prevent leakage between an impeller and a non-rotating part.
  • the purpose of our invention is to replace the wear parts made of rubber by a more resistant material which extends the service intervals.
  • At least one of the seal rings is attached by help of an O-ring.
  • a mechanical seal is thus arranged between the impeller 1 and the housing 2 preventing medium that has passed through the impeller to flow back to the inlet.
  • the mechanical seal which has an radial sealing surface, consists of a seal ring 3 attached to the impeller and another ring 4 attached to the housing.
  • at least one of the rings 3 is attached by an O-ring.
  • a slot 6 is made in the impeller, extending axially along a part of a mantle surface of the impeller. The slot has then such a configuration that it is deeper in the radial direction at some distance from the opening.
  • a sealing is obtained which is very resistant to wear and in addition the 0-ring attachment means that the rings are easy to replace and problems due to the seal rings not being sufficiently plain are eliminated.
  • a specific advantage occurs if the sealing surface has a radial direction. This means that the demands for tolerances decrease as a sufficient sealing is obtained, even if the rings are somewhat displaced relative each other. This quality is especially important if the pump contains several steps, that is to say several continuous impellers on the same shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Mechanical Sealing (AREA)

Description

  • This invention concerns a seal device as claimed in claim 1 to prevent leakage between an impeller and a non-rotating part.
  • Pumps having a rotating impeller such as centrifugal pumps, take in the pumped medium atthe center of the impeller and leave it by the periphery. It is then important that the inlet of the impeller fits closely with the inlet of the housing and that pumped medium is prevented from flowing back to the inlet. Such a backflow creates efficiency losses and turbulence at the inlet.
  • In order to obtain the requested sealing between impeller and non-rotating parts, it is common to arrange a wear part, for instance made of rubber, on the non-rotating part and let the impeller contact that part during rotation. In this way an effective sealing is obtained as long as the wear part is intact. When pumping liquids containing heavily wearing objects, such as sand and sludge cuttings in mines, the lifetime of the wear parts become very short which means short service intervals.
  • According to US-A-1521226 subject problem has been solved by a device where parts may be adjusted to take up for wear. The adjustment is obtained by pressing an inclined surface of its seal ring towards a gasket.
  • The purpose of our invention is to replace the wear parts made of rubber by a more resistant material which extends the service intervals.
  • This is obtained by providing the impeller as well as the non-rotating part with seal rings made of hard metal or ceramics, which together form a mechanical seal which in an effective way prevents the pumped medium from flowing back to the inlet and which has a very good wear resistance.
  • According to a preferred embodiment of the invention, at least one of the seal rings is attached by help of an O-ring. This means that the seal ring may be easily replaced and also eliminates problems due to the seal ring not being sufficiently plain. The latter may easily be the case if the ring is mounted in another way, for instance as a shrinkage fit; as the diameters in question are big.
  • The invention is described more closely below with reference to the enclosed drawing.
  • In the drawing 1 stands for an impeller, 2 a part of a pump housing, 3 and 4 mechanical seal rings, 5 an 0-ring and 6 a slot for the latter.
  • According to the invention a mechanical seal is thus arranged between the impeller 1 and the housing 2 preventing medium that has passed through the impeller to flow back to the inlet.
  • The mechanical seal, which has an radial sealing surface, consists of a seal ring 3 attached to the impeller and another ring 4 attached to the housing. In order to make replacement possible, at least one of the rings 3 is attached by an O-ring. For that purpose a slot 6 is made in the impeller, extending axially along a part of a mantle surface of the impeller. The slot has then such a configuration that it is deeper in the radial direction at some distance from the opening.
  • When mounting a seal ring on the impeller, an O-ring is first placed in the slot and then the seal ring is pressed downwards outside the O-ring. This means that the O-ring becomes deformed and thus locks the seal ring. Thanks to the fact that the slot is more shallow at the opening, the locking becomes very effective as the 0-ring must be deformed even more to be able to slip out of the slot. This means that the locking becomes stronger the higher pressure the seal is exposed to. Even the other seal ring 4 may be mounted in the same way.
  • The advantages in the invention are several. A sealing is obtained which is very resistant to wear and in addition the 0-ring attachment means that the rings are easy to replace and problems due to the seal rings not being sufficiently plain are eliminated.
  • A specific advantage occurs if the sealing surface has a radial direction. This means that the demands for tolerances decrease as a sufficient sealing is obtained, even if the rings are somewhat displaced relative each other. This quality is especially important if the pump contains several steps, that is to say several continuous impellers on the same shaft.

Claims (2)

1. A seal device in a rotating impeller (1) and its surrounding housing (2), comprising a seal ring (3) arranged in a slot (6) in said impeller (1) and another seal ring (4) arranged in a slot in said housing (2), said seal rings (3, 4) forming a mechanical seal device between said impeller (1) and said housing (2), charactered in that at least one of the seal rings (3) is attached by help of an 0-ring (5) located in said slot (6), said 0-ring (5) being such that when mounting the seal ring (3), the 0-ring is deformed within the circumferential axially directed slot (6) adjacent to the seal ring (3), thus locking the latter, the outer opening of said slot (6) being somewhat shallower in the radial direction than its inner part thus effectively blocking the 0-ring within the inner part of the slot.
2. A device according to claim 1, characterized in that the sealing surface between the two seal rings (3) and (4) has a radial direction with regard to the axis of rotation.
EP86850033A 1985-02-14 1986-02-04 A seal device Expired - Lifetime EP0192621B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8500691A SE459755B (en) 1985-02-14 1985-02-14 DEVICE TO ACHIEVE A SEAL BETWEEN A ROTARY PUMP WHEEL AND A SURROUNDING PUMP HOUSE
SE8500691 1985-02-14

Publications (2)

Publication Number Publication Date
EP0192621A1 EP0192621A1 (en) 1986-08-27
EP0192621B1 true EP0192621B1 (en) 1990-10-24

Family

ID=20359116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86850033A Expired - Lifetime EP0192621B1 (en) 1985-02-14 1986-02-04 A seal device

Country Status (5)

Country Link
EP (1) EP0192621B1 (en)
JP (1) JPS61192896A (en)
AU (1) AU593534B2 (en)
DE (1) DE3675032D1 (en)
SE (1) SE459755B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9616020D0 (en) * 1996-07-31 1996-09-11 Framo Dev Ltd Dynamic weir ring

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018544A (en) * 1976-02-20 1977-04-19 Hale Fire Pump Company Centrifugal pump

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE142214C (en) *
US1521226A (en) * 1921-01-28 1924-12-30 Paul G Bogdanoff Centrifugal pump
DE422681C (en) * 1923-03-21 1925-12-09 Edwin Letts Oliver Gap seal for turbines, pumps and similar centrifugal machines
AU476959B2 (en) * 1973-09-18 1976-10-07 Westinghouse Electric Corporation Improvements in or relating to rotating element fluid seal for centrifugal compressor
AU8739075A (en) * 1974-12-24 1977-06-16 Warman Int Ltd Self centring festrictor bush

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018544A (en) * 1976-02-20 1977-04-19 Hale Fire Pump Company Centrifugal pump

Also Published As

Publication number Publication date
AU5292086A (en) 1986-08-21
SE8500691L (en) 1986-08-15
EP0192621A1 (en) 1986-08-27
JPH0217719B2 (en) 1990-04-23
SE459755B (en) 1989-07-31
DE3675032D1 (en) 1990-11-29
JPS61192896A (en) 1986-08-27
SE8500691D0 (en) 1985-02-14
AU593534B2 (en) 1990-02-15

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