EP1365156B1 - Spaltdichtung für eine Pumpe - Google Patents
Spaltdichtung für eine Pumpe Download PDFInfo
- Publication number
- EP1365156B1 EP1365156B1 EP20020009183 EP02009183A EP1365156B1 EP 1365156 B1 EP1365156 B1 EP 1365156B1 EP 20020009183 EP20020009183 EP 20020009183 EP 02009183 A EP02009183 A EP 02009183A EP 1365156 B1 EP1365156 B1 EP 1365156B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stiffening element
- sealing material
- seal
- fluid
- sealing
- 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
Links
Images
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
- the invention relates to a gap seal and a centrifugal pump unit with a corresponding gap seal.
- Impeller and seal exist either made of plastic or a combination of metal and plastic. So can the impeller in the suction mouth of a stainless metal sleeve be surrounded, which with a plastic or elastomer seal is in contact. Such seals are for example from EP 0 492 603 B1, FR 2 469 582 and GB 1 226 475.
- Plastics have the property when exposed to certain fluids swelling, which leads to a resizing.
- a gap seal made of plastic used in a water pump so the plastic swells on exposure to the water, resulting in a Narrowing of the sealing diameter leads. This increases the friction between the seal and the impeller, causing the recorded Power of the pump increases.
- the gap seal according to the invention is particularly suitable for Use in a pump, especially water pump, but can also be used in other systems, which have a seal with constant Outside dimensions require.
- the gap seal according to the invention has a stiffening element, which at least partially of a Surrounding sealing material.
- a Surrounding sealing material are the material of the stiffening element and the sealing material chosen so that at least a sealing dimension of the gap seal when exposed to a fluid substantially remains constant.
- the sealing measure is that measure in which Direction of the gap to be sealed.
- the constant sealing dimension upon the action of a fluid is by mutual compensation of ashrinking and swelling of the sealing material and the material reaches the stiffening element.
- the materials become like that that selected a shrinkage or swelling of the material of the stiffening element under the influence of a fluid due to shrinkage or Sources of the sealing material under the influence of the fluid at least partially is compensated.
- the materials are chosen so that the shrinking or swelling one material shrinking or swelling the other material compensates in the desired direction, thereby creating a substantially constant dimension can be achieved in this direction.
- the material of the stiffening element under influence of a fluid to a certain extent swell, while the sealing material under the influence of the fluid by a corresponding amount shrinking. To achieve this compensation effect, this must be Material of the stiffening element and the sealing material in dependence of the acting, d. H.
- the stiffening element and the sealing material in their rigidity and geometric shape to match.
- the stiffening element can be formed so that it an expansion of the sealing material when swelling only in one certain direction.
- the direction of stretching or shrinkage The individual elements are chosen so that a certain degree the gap seal even when swelling substantially constant can be held.
- the gap seal is a ring with an annular stiffening element educated.
- a gap seal can in Be arranged region of the suction mouth of a centrifugal pump.
- the gap seal is designed as a radial sealing ring and the sealing material is at least on the inner circumference of Stiffening element arranged, with a sealing diameter below Influence of the fluid remains substantially constant.
- the sealing diameter is the inner diameter of the sealing ring, which is in contact with the rotating impeller.
- the material of the stiffening element In the case of a sealing ring are the material of the stiffening element and the sealing material is preferably both chosen that they swell under the influence of the fluid.
- the swelling of the material the stiffening element causes the stiffening element enlarged in the circumferential direction, whereby also the inner diameter of the stiffening element increases.
- the sealing material should be chosen so that it swells.
- the sealing material is preferably chosen so that it, when it swells under the influence of fluid, its dimensions are increased, that the diameter enlargement of the stiffening ring substantially is compensated.
- the stiffnesses of the elements d. H.
- the stiffening ring is formed so stiff that it not to a diameter extension of the stiffening ring the swelling of the sealing material arranged on the inner circumference comes.
- the materials are further preferably chosen so that the Sealing material under the influence of the fluid swells more than the material of the stiffening element. This is required to be usual Dimensions of the gap seal sufficient compensation of To achieve size changes. Under the influence of the fluid swell that Seal material and the material of the stiffening element to a relative measure, d. H. a certain percentage. Because the absolute Length of the stiffening ring in its circumferential direction usually is considerably larger than the radial extent of the sealing material, is the absolute amount to the the stiffening element in the circumferential direction swells, be greater than the absolute amount to the sealing material swells in the radial direction.
- the absolute Radius expansion of the inner diameter of the stiffening element be greater than the radial enlargement of the sealing material by swelling.
- the materials are chosen so that the ratio the source factor of the material of the stiffening element to the swelling factor the sealing material the ratio of a radial width of Sealing material corresponds to the inner radius of the stiffening element.
- the swelling factor is the relative amount or percentage, around which the respective material swells under the influence of fluid.
- the materials must be chosen so be that their source factors to each other above-mentioned ratio which has the ratio of the radial width of the on the Inner circumference of the stiffening element applied sealing material to the inner diameter of the stiffening element equivalent.
- the stiffening element preferably polybutylene terephthalate (PBT) and as a sealing material a thermoplastic elastomer, in particular polyurethane, d. H. CPU selected.
- PBT polybutylene terephthalate
- thermoplastic polyurethane is also known as known thermoplastic rubber.
- the use of polyurethane as sealing material and PBT as material for the stiffening element causes a substantially complete compensation of the Swelling the two elements so that the seal dimension, d. H. in the Case of a sealing ring, the inner diameter of the sealing material remains essentially constant.
- the stiffening element is preferably overmoulded with the sealing material. This allows a cost-effective production of the gap seal with low tolerances.
- the invention further relates to a pump unit with at least one Impeller, wherein arranged at the suction mouth of the impeller, a gap seal is as described above.
- a Pump unit can reduce the power loss occurring Be as the inner diameter of the gap seal under action the fluid remains substantially constant, so that the predetermined Tolerances are maintained during operation.
- multi-level Pumps can have a gap seal in each pump stage according to previous description, whereby the power loss can be significantly reduced.
- the pump unit is a water pump.
- Fig. 1 shows a sectional view of a centrifugal pump stage.
- an impeller 4 is rotatably arranged.
- the suction side 6 is provided, through which the promotional Fluid enters the pump.
- the suction side 6 faces facing the Impeller 4 has a suction mouth or inlet section 8, through which the fluid to be delivered, for example water, enters the impeller 4.
- a metal ring 10 On the outer circumference of the suction port 8 of the impeller 4 with a metal ring 10, in particular of stainless steel, provided, d. H. jacket advantage.
- On the ring 10 is an annular gap seal 12 at.
- the gap seal 12 is mounted or arranged in the housing 2 and seals the suction port 8 of the impeller 4 relative to the housing 2 from. This means the ring 10 with the inlet section or suction mouth 8 the impeller 4 moves relative to the inner periphery of the gap seal 12, which is in engagement with the ring 10.
- Fig. 2 shows a plan view of the gap seal 12.
- the gap seal 12 consists of an annular stiffening element 14, which with a sealing material 16 is provided or molded.
- the sealing material 16 is in particular on the inner circumference of the stiffening ring 14 arranged.
- the stiffening ring or the stiffening element 14 has a plurality of circular projections 18 at its ends on. When encapsulating the stiffening element 14 with the sealing material 16, the projections 18 engage the sealing material 16 and thus cause a positive connection of sealing material 16 and stiffening element 14.
- the stiffening element 14 At its outer periphery the stiffening element 14 has projecting lugs 20, which for fixing the gap seal 12 in the pump housing. 2 serve.
- Fig. 3 shows a sectional view of the gap seal according to FIG. 2 along the line A-A.
- the annular stiffening element 14 with to see the protrusions 18 arranged on top and bottom, which engage in the sealing material 16, which is the stiffening element 14 surrounds.
- the stiffening element 14 is also on a End face 22, which with the housing 2 (see Fig. 1) in contact comes covered with the sealing material 16 to the gap seal To seal against the housing 2.
- the stiffening element 14 completely encased with the sealing material 16 be.
- the radius R defines the inner diameter or sealing diameter the gap seal 12. This diameter is the inner diameter the sealing material 16, which the outer diameter of the ring 10 and the suction port 8 of the impeller 4 corresponds to this sealingly in contact.
- This dimension is the dimension of the split-ring seal, which in the example shown during operation too under the action of a fluid should be kept constant, to friction losses in the area of the impeller 4 during operation of the pump too avoid.
- FIG. 4 shows an enlarged detail view of the detail B in FIG. 3.
- the stiffening element 14 surrounded by the sealing material 16.
- a prefabricated stiffening element 14 made of plastic with the sealing material 16 overmoulded.
- the projections 18 engage on the Stiffening element 14 in the sealing material 16 a form fit, so that a firm connection between sealing material 16 and stiffening element 14 is reached.
- the projections 20, which for engagement with the housing 2 are provided.
- the materials of the stiffening element 14 and the sealing material are chosen so that under the influence of the fluid to be pumped so swell or shrink, that the swelling or Shrinkage of the one material with the swelling or shrinkage of the other material balances, leaving the radius R in the gap seal remains essentially constant.
- Plastics swell or shrink differently. So it is required, if necessary, the materials for the stiffening element 14 and to select the sealing material 16 according to the fluid to be delivered.
- the stiffening element 14 is preferred made of PBT (polybutylene terephthalate) of PPS (polyethylene sulfide).
- the sealing material 16 is made of TPU, for example (thermoplastic polyurethane or thermoplastic rubber) is formed.
- TPU thermoplastic polyurethane or thermoplastic rubber
- the sealing material 16 must have sufficient elasticity have to seal the rotating impeller against the housing, while the stiffening element 14 for sufficient dimensional stability provides. Further, it is preferable that the sealing material 16 is thermoplastic to process, as it is very easy and inexpensive can be splashed around the stiffening element 14.
- the materials swell exactly so that the radius R remains constant (see FIG. 3).
- the stiffening element 14 swells by a factor x
- the circumference of the stiffening element 14 increases by this factor x.
- the radius of the annular stiffening element 14 also increases by this factor x.
- the sealing material 16 is chosen so that it also swells and the radius extension of the stiffening element 14 compensates, so that the radius R remains substantially constant.
- This relationship expresses that the source factor x of the material of the Stiffening element 14 a relationship to the swelling factor y of the sealing material 16 must have what the ratio of a radial Width b of the sealing material 16 to the inner radius (R + b) of the stiffening element 14 corresponds.
- the swelling factor is the factor to the respective material under the action of a fluid to be pumped swells. If the materials chosen according to this relationship can be the radius R in the interior of the gap seal substantially kept constant.
- FIG. 5 shows a diagram in which the swelling properties of various Stiffening rings of different materials, namely polyamide (PA), polyethylene sulfide (PPS) and polybuthylene terephthalate (PBT) are.
- FIG. 5 shows the test results of an experiment which a stiffening ring was placed in water for several days and the swelling was detected by the change in diameter. It can be seen, the polyamide swells very strong and large diameter changes while for polybuthylene terephthalate (PBT) nearly no change in diameter is detectable even after 40 days.
- PPS polyethylene sulfide
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
- Fig. 1
- eine Schnittansicht einer Stufe einer Kreiselpumpe mit der erfindungsgemäßen Spaltdichtung,
- Fig. 2
- eine Draufsicht auf die erfindungsgemäße Spaltdichtung,
- Fig. 3
- eine Schnittansicht der Spaltdichtung entlang Linie A-A in Fig. 2,
- Fig. 4
- eine vergrößerte Ansicht des Ausschnitts B in Fig. 3, und
- Fig. 5
- ein Diagramm mit dem Quelleneigenschaften verschiedener Versteifungselemente.
- 2 -
- Gehäuse
- 4 -
- Laufrad
- 6 -
- Saugseite
- 8 -
- Saugmund des Laufrades
- 10 -
- Ring
- 12 -
- Spaltdichtung
- 14 -
- Versteifungselement
- 16 -
- Dichtungsmaterial
- 18 -
- Vorsprünge
- 20 -
- Nasen
- 22 -
- Stirnseite
- R -
- Radius
- b -
- Breite
- x, b -
- Quellfaktoren
Claims (10)
- Spaltdichtung, insbesondere für eine Pumpe, mit einem Versteifungselement (14) und einem dieses zumindest teilweise umgebenden Dichtungsmaterial (16), dadurch gekennzeichnet, dass das Material des Versteifungselementes (14) und das Dichtungsmaterial (16) so gewählt sind, dass ein Schrumpfen oder Quellen des Materials des Versteifungselementes (14) unter Einfluss eines Fluids durch ein Schrumpfen oder Quellen des Dichtungsmaterials (16) unter Einfluss des Fluids zumindest teilweise derart kompensiert wird, dass zumindest ein Dichtmaß (R) der Spaltdichtung (12) im Wesentlichen konstant bleibt.
- Spaltdichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Spaltdichtung (12) als Ring mit einem ringförmigen Versteifungselement (14) ausgebildet ist.
- Spaltdichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Spaltdichtung (12) als Radial-Dichtungsring ausgebildet ist und das Dichtungsmaterial (16) zumindest am Innenumfang des Versteifungselementes (14) angeordnet ist, wobei ein Dichtdurchmesser (R) unter Einfluss des Fluids im Wesentlichen konstant bleibt.
- Spaltdichtung nach Anspruch 3, dadurch gekennzeichnet, dass das Material des Versteifungselementes (14) und das Dichtungsmaterial (16) so gewählt sind, dass sie unter Einfluss des Fluids aufquellen.
- Spaltdichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Dichtungsmaterial (16) unter Einfluss des Fluids stärker aufquillt als das Material des Versteifungselementes (14).
- Spaltdichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Verhältnis des Quellfaktors (x) des Materials des Versteifungselementes (14) zum Quellfaktor (y) des Dichtungsmaterials (16) dem Verhältnis einer radialen Breite (b) des Dichtungsmaterials (16) zum Innenradius (b+R) des Versteifungselementes (14) entspricht.
- Spaltdichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Versteifungselement (14) aus PBT gefertigt ist und das Dichtungsmaterial (16) ein thermoplastisches Elastomer, insbesondere Polyurethan ist.
- Spaltdichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Versteifungselement (14) mit dem Dichtungsmaterial (16) umspritzt ist.
- Pumpenaggregat mit zumindest einem Laufrad, dadurch gekennzeichnet, dass am Saugmund (8) des Laufrades (4) eine Spaltdichtung (12) gemäß einem der vorangehenden Ansprüche angeordnet ist.
- Pumpenaggregat nach Anspruch 9, dadurch gekennzeichnet, dass das Pumpenaggregat eine Wasserpumpe ist.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20020009183 EP1365156B1 (de) | 2002-04-25 | 2002-04-25 | Spaltdichtung für eine Pumpe |
DE50203754T DE50203754D1 (de) | 2002-04-25 | 2002-04-25 | Spaltdichtung für eine Pumpe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20020009183 EP1365156B1 (de) | 2002-04-25 | 2002-04-25 | Spaltdichtung für eine Pumpe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1365156A1 EP1365156A1 (de) | 2003-11-26 |
EP1365156B1 true EP1365156B1 (de) | 2005-07-27 |
Family
ID=29286094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020009183 Expired - Lifetime EP1365156B1 (de) | 2002-04-25 | 2002-04-25 | Spaltdichtung für eine Pumpe |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1365156B1 (de) |
DE (1) | DE50203754D1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2466148A1 (de) | 2010-12-15 | 2012-06-20 | KSB Aktiengesellschaft | Dichtungsanordnung für Kreiselpumpen |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1226475A (de) * | 1969-05-20 | 1971-03-31 | ||
DE2945932C2 (de) * | 1979-11-14 | 1983-12-08 | Messer Griesheim Gmbh, 6000 Frankfurt | Abdichtungseinrichtung |
US5295786A (en) * | 1990-12-27 | 1994-03-22 | Ebara Corporation | Liner ring for a pump |
DE19800617A1 (de) * | 1998-01-12 | 1999-07-15 | Klein Schanzlin & Becker Ag | Kreiselpumpe |
-
2002
- 2002-04-25 EP EP20020009183 patent/EP1365156B1/de not_active Expired - Lifetime
- 2002-04-25 DE DE50203754T patent/DE50203754D1/de not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2466148A1 (de) | 2010-12-15 | 2012-06-20 | KSB Aktiengesellschaft | Dichtungsanordnung für Kreiselpumpen |
DE102010063108A1 (de) | 2010-12-15 | 2012-06-21 | Ksb Aktiengesellschaft | Dichtungsanordnung für Kreiselpumpen |
Also Published As
Publication number | Publication date |
---|---|
DE50203754D1 (de) | 2005-09-01 |
EP1365156A1 (de) | 2003-11-26 |
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