EP4098883A1 - Pompe centrifuge à joint d'étanchéité de col d'aspiration amélioré - Google Patents

Pompe centrifuge à joint d'étanchéité de col d'aspiration amélioré Download PDF

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Publication number
EP4098883A1
EP4098883A1 EP22165688.7A EP22165688A EP4098883A1 EP 4098883 A1 EP4098883 A1 EP 4098883A1 EP 22165688 A EP22165688 A EP 22165688A EP 4098883 A1 EP4098883 A1 EP 4098883A1
Authority
EP
European Patent Office
Prior art keywords
ring
inner ring
centrifugal pump
outer ring
impeller
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.)
Granted
Application number
EP22165688.7A
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German (de)
English (en)
Other versions
EP4098883B1 (fr
Inventor
Olga Weizel
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.)
Wilo SE
Original Assignee
Wilo SE
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Publication date
Application filed by Wilo SE filed Critical Wilo SE
Publication of EP4098883A1 publication Critical patent/EP4098883A1/fr
Application granted granted Critical
Publication of EP4098883B1 publication Critical patent/EP4098883B1/fr
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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
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the invention relates to a centrifugal pump with a pump housing and an impeller arranged therein, which is radially sealed by a suction neck seal which comprises a metallic outer ring, an inner ring held therein and a plastic sealing ring which surrounds the impeller to form a radial sealing gap.
  • the suction neck seal ensures that the suction side of the impeller is separated from its pressure side, as otherwise there would be a hydraulic short circuit between the suction and pressure sides, with which part of the medium delivered by the pump flows past the impeller to its suction mouth and is sucked in again by the impeller there would.
  • the suction neck seal is intended to prevent this by sealingly abutting against the radial outside of the impeller, more precisely on the outside of a cylindrical section of the support disk covering the impeller blades, known in technical jargon as the suction neck.
  • the suction neck seal in three parts, in that two essentially L-shaped metal rings made of deep-drawn stainless steel, also known as the outer and inner cage, are pressed axially into one another, with a sealing ring made of a hard plastic such as PPS (polyphenylene sulfide) being arranged between them. which is intended to be stationary relative to the impeller.
  • PPS polyphenylene sulfide
  • suction neck seal Another disadvantage of this known suction neck seal is that it is complex to manufacture. A corresponding press is required for the non-positive connection between the metal rings, i.e. for their axial pressing, since the inner cage is oversized compared to the outer cage. This press complicates the manufacturing process. In addition, a high level of precision and low manufacturing tolerances must be maintained for the metal rings in order to prevent tarnishing on the one hand and to achieve good sealing of the impeller, i.e. minimum leakage through the sealing gap, on the other.
  • the inner ring has a profile made of an elastomer with a U-shaped cross section, in which the sealing ring is accommodated in particular in a form-fitting manner.
  • the inner cage known from the prior art is thus replaced by a receiving ring made of an elastic plastic, in which the sealing ring is held.
  • the outer ring which is separate from the pump housing, can continue to correspond to the outer cage known from the prior art. It therefore does not have to be adapted, which consequently also applies to the intake of the suction neck seal in the pump housing and thus enables the suction neck seal according to the invention to be ideally used as a retrofit.
  • the suction neck seal is a component independent of the pump housing.
  • the manufacture of the suction neck seal is simpler because, firstly, the metalworking of the inner ring by stamping and deep-drawing is no longer necessary and, secondly, no press is required to press the inner and outer rings together.
  • the inner ring can be injection molded in a simple manner and the sealing ring can be easily and quickly inserted into it due to the flexibility or stretchability of the inner ring, namely without tools (manually) and in a few seconds, for example by slipping the inner ring over the sealing ring.
  • the frictional resistance between the sealing ring and the receiving ring is greater due to the greater surface roughness of the elastomer, so that the sealing ring can be rotated less easily, i.e. there is less relative movement between the sealing ring and the receiving ring.
  • the inner ring has a dampening effect with regard to vibrations or impacts due to the elastomer and is able to compensate for tolerances, so that the inner ring does not have to be manufactured as precisely as the receiving ring before. As a result, noise that is presumably caused by the suction neck seal is effectively avoided.
  • the inner ring is held in a form-fitting manner on the outer ring in order to hold the inner ring in a secure position.
  • the shape of the outer ring required for this can be easily produced by injection molding and the form fit is possible in a simple manner, quickly and above all without tools due to the elasticity of the inner ring.
  • the positive connection between the inner and outer ring is achieved in that the inner ring has a radially outwardly directed collar at one axial end, with which it engages axially behind the outer ring.
  • the form fit likewise does not require any changes to be made on the part of the outer ring or pump housing and is also easy to produce.
  • the outer ring may have a cross-sectional L-shaped profile and the inner ring axially inserted into the outer ring such that a radially inward sidewall of the U-shaped inner ring abuts a radially inward sidewall of the outer ring.
  • the inside diameter of the outer ring can be larger than the outside diameter of the inner ring.
  • play is achieved between the inner and outer ring, which facilitates the axial insertion of the inner ring into the outer ring.
  • the outer ring preferably lies, in particular in a non-positive manner, in a recess in the pump housing.
  • the suction neck seal is thus held securely in the pump housing.
  • Both the axially extending, cylindrical outer wall and the radially inward-pointing, annular side wall of the L-shaped outer ring can lie in the recess in such a way that the side wall also rests against the pump housing, which when the suction neck seal is axially joined into the recess stop forms. This enables accurate axial positioning of the suction neck seal.
  • the outer ring can be formed from deep-drawn sheet metal, in particular from high-grade steel.
  • the sealing ring can be made, for example, from PPS, in particular from fiber-reinforced PPS.
  • the inner ring can preferably be made of EPDM (ethylene propylene diene rubber) or another rubber-like material.
  • EPDM ethylene propylene diene rubber
  • the inner ring is in one piece. It thus has a one-piece structure, consisting of a single part that is intended to be slipped over the sealing ring. Thus, a minimum number of parts to assemble. However, depending on the elasticity of the material used for the inner ring, putting it on can be difficult because the inner ring has to be stretched by several millimeters. This can be avoided if the inner ring consists of two or more assembled ring segments which together form the inner ring. Such an inner ring then has a multi-part structure. A multi-part or segmented construction of the inner ring also has the advantage that the injection molding tool for producing the ring segments is simpler can be designed because the injection mold can be designed without undercuts. It is therefore not necessary to work with slides or cores.
  • the ring segments form peripheral sections of the inner ring, which are placed against the sealing ring from the outside without having to be stretched, and preferably loosely.
  • each ring segment thus extends along 180° of the circumference of the sealing ring.
  • the arrangement formed from the sealing ring and ring segments is then inserted axially into the outer ring.
  • FIG 1 shows the pump housing 2 of an electric motor-driven centrifugal pump 1, whose drive unit is not shown for the sake of simplicity.
  • This drive unit can be an electronically commutated, permanent-magnetic synchronous motor, preferably of wet-running design.
  • the drive unit drives an impeller 3 which is arranged within the pump chamber 5 formed in the pump housing 2 .
  • Also formed in the pump housing 2 are a suction channel 4 which opens axially into the pump chamber and a pressure channel 6 which leads out of the pump chamber 5 .
  • the pump chamber 5 is snail-shaped in such a way that its inner diameter increases steadily in the circumferential direction towards the pressure channel and the pressure channel exits tangentially.
  • the impeller 3 is a so-called covered impeller 3. It has a support disk 9, from which the impeller blades 11 rise, which are covered by a cover disk 10. The impeller blades are thus located between the support disk 9 and the cover disk 10.
  • the support disk 10 transitions radially inwards into a tubular section which forms the so-called suction mouth 12 of the impeller 3.
  • the outer circumference 13 of this tubular section forms the so-called suction neck 13.
  • the axial end of the tubular section of the cover disk 10 that is remote from the carrier disk is attached to the orifice through which the suction channel 4 opens into the pump chamber 5, so that the impeller 3 sucks liquid through the suction channel 4 and sucks it directly into the suction mouth 12.
  • the liquid is then accelerated radially-tangentially by the impeller 3 so that the area of higher pressure is present in the pump chamber 5 .
  • a suction neck seal 7 is provided between the suction and pressure area, which seals the impeller 3 at its suction neck 13, ie forming a radial gap.
  • the suction neck seal is in one Recess 8 of the pump housing, ie in an annular recess that surrounds the orifice slightly offset axially.
  • the suction neck seal 7 is a component that is separate from the pump housing 5 . It is constructed in three parts and consists of an outer ring 14, an inner ring 15 and a sealing ring 16. In particular, the outer ring 14 is independent of the pump housing 5.
  • Figures 2, 3 and 4 show a first Figures 5, 6 and 7 a second embodiment of such a suction neck seal 7, wherein in the pump housing 2 according to figure 1 the second embodiment is used.
  • the outer ring 14 has an L-shaped cross-section made up of an axially and a radially extending leg 23, 24. More specifically, the outer ring 14 consists of a cylindrical outer wall 23 and a radially inwardly directed, annular side wall 24, in which the outer wall 23 merges in one piece at a first axial end. The inner peripheral edge 26 of this side wall 24 defines an opening through which the impeller 3 with its suction mouth 12 extends. Due to its L-shape, the outer ring 14 has an opening of larger diameter at the second axial end opposite the side wall 24 directed radially inwards.
  • This opening is the insertion opening for the inner ring 15, which is inserted into the outer ring 14 by appropriate axial joining, in such a way that the outer ring 14 engages the inner ring 15 both radially, namely with the outer wall 23, and axially, namely with the side wall 24, embraces.
  • the second axial end has a conical widening of the outer wall 23 towards the outside, which facilitates the axial insertion of the inner ring 15 into the outer ring 14 .
  • the outer ring 14 is made of metal, more precisely by deep-drawing a stainless steel sheet.
  • the inner ring 15 has a U-shaped cross-section consisting of an axially and two radially extending legs 17, 18, 19. More precisely, the inner ring 15 consists of a cylindrical outer wall 17 and a radially inwardly directed, annular side wall 18, 19 at each of the two axial ends of the outer wall 17, the outer wall 17 and the side walls 18, 19 merging into one another in one piece. At the inner peripheral edge of one of the side walls 19 is a axially extending neck 20 formed. At the axial end opposite the side wall 19, the neck 20 in turn merges into a radially outwardly projecting, flange-like collar 21, so that an annular groove 22 is formed between the collar 21 and the side wall 19, see FIG Figure 2.
  • Figure 1 clarifies the form-fitting assembly of the inner ring 15 on the outer ring 14, with its collar facing the pressure channel 4.
  • the collar 21 of the inner ring 15 engages behind the outer ring 14 , more precisely its side wall 24 , axially, so that the inner peripheral edge 26 of the side wall 24 rests in the annular groove 22 .
  • the outer ring 14 is made of an elastomeric material such as EPDM, more specifically by injection molding.
  • the sealing ring 16 lies in the interior space of the inner ring 15 defined by the two side walls 18 , 19 .
  • it has a square cross-section, which of course can also be different.
  • the two side walls 18, 19 of the inner ring 15 thus form boundaries for the sealing ring 16 and hold it in position.
  • the inside diameter of the sealing ring 16 is smaller than the respective inside diameter of the annular side walls 18, 19 of the inner ring 15, so that the sealing ring 16 protrudes radially from the inner ring 15, see FIG figure 1 , And can freely seal the suction neck 13 radially on the outside.
  • the first variant is particularly characterized in that the inner ring 15 is in one piece.
  • the sealing ring 16 is inserted into the interior of the inner ring 15 in that the inner ring 15 is stretched and slipped over the sealing ring 16, one of the two side walls 18, 19 being folded over at least in sections.
  • the arrangement formed in this way is then inserted axially into the outer ring 14 and the suction neck seal formed in this way is again inserted in a non-positive manner into the recess 8 of the pump housing 2 .
  • the second embodiment is characterized in that the inner ring 15 is in two parts, namely a first ring segment 15a and a second ring segment 15b, see Figures 6 and 7 .
  • the two ring segments 15a, 15b each extend along a circumferential angle of 180 ° and together form the inner ring 15.
  • the insertion of the sealing ring 16 in the interior of the inner ring 15 is achieved here simply by the fact that the two ring segments 15a, 15b on the outside of the sealing ring 16 are scheduled.
  • the arrangement formed in this way is then inserted axially into the outer ring 14 and the suction neck seal formed in this way is again inserted in a non-positive manner into the recess 8 of the pump housing 2 .
  • the multi-part design variant of the inner ring 15 has the advantage that the injection mold for producing the inner ring 15 or its segments 15a, 15b can be designed more simply, namely without undercuts.
  • a further difference between the first and the second variant is the position of the side wall 18 of the inner ring 15 remote from the collar 21 in relation to the axial end of the inner ring remote from the collar 21 . While this side wall 18 is formed flush with said axial end in the first embodiment, such as figure 4 shows, the side wall 18 in the second embodiment is slightly set back relative to said axial end, forming a groove 27, as shown in FIG Figures 5 and 7 demonstrate.
  • both shown variants have the advantage that the suction neck seal 7 can be manufactured more simply by using an elastic U-shaped inner ring 15 compared to an inner cage made of metal, because this inner cage does not have to be deep-drawn, no pressing of the inner and outer ring is required and the sealing ring 16 due to the flexibility or extensibility of the inner ring 15 easily and quickly, namely without tools (by hand) and in a few seconds, can be used in this.
  • noise emissions are avoided because the frictional resistance between the sealing ring 16 and the inner ring 15 is greater due to the higher surface roughness of the elastomer, so that the sealing ring 16 rotates less easily, i.e.
  • the sealing ring 16 there is less relative movement between the sealing ring 16 and the inner ring 15, and because the inner ring 15 the elastomer has a dampening effect with regard to vibrations or shocks.
  • the inner ring 15 is able to compensate for tolerances, so that the inner ring 15 cannot be manufactured as precisely got to. As a result, noise that is presumably caused by the suction neck seal is effectively avoided
  • the invention also includes any changes, alterations or modifications of exemplary embodiments which have the exchange, addition, alteration or omission of elements, components, method steps, values or information as their subject matter, as long as the basic idea according to the invention is retained, regardless of whether the change, alteration, or modifications improves or degrades an embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22165688.7A 2021-06-02 2022-03-30 Pompe centrifuge à joint d'étanchéité de col d'aspiration amélioré Active EP4098883B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU500237A LU500237B1 (de) 2021-06-02 2021-06-02 Kreiselpumpe mit verbesserter Saughalsdichtung

Publications (2)

Publication Number Publication Date
EP4098883A1 true EP4098883A1 (fr) 2022-12-07
EP4098883B1 EP4098883B1 (fr) 2024-07-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22165688.7A Active EP4098883B1 (fr) 2021-06-02 2022-03-30 Pompe centrifuge à joint d'étanchéité de col d'aspiration amélioré

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EP (1) EP4098883B1 (fr)
LU (1) LU500237B1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0167837A1 (fr) * 1984-06-07 1986-01-15 LOWARA S.p.A. Dispositif d'étanchéité pour interposition entre un boîtier de pompe et une roue à aube
JPH02309000A (ja) * 1989-05-22 1990-12-21 Ebara Corp 遠心ポンプ用ライナリング
US5295786A (en) * 1990-12-27 1994-03-22 Ebara Corporation Liner ring for a pump
DE202006007672U1 (de) * 2005-12-22 2007-02-08 Allweiler Ag Kreiselpumpe, insbesondere Spiralgehäuse-Kreiselpumpe mit Dichtsystem
JP2020056360A (ja) * 2018-10-02 2020-04-09 株式会社荏原製作所 ライナーリングおよび回転機械

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0167837A1 (fr) * 1984-06-07 1986-01-15 LOWARA S.p.A. Dispositif d'étanchéité pour interposition entre un boîtier de pompe et une roue à aube
JPH02309000A (ja) * 1989-05-22 1990-12-21 Ebara Corp 遠心ポンプ用ライナリング
US5295786A (en) * 1990-12-27 1994-03-22 Ebara Corporation Liner ring for a pump
DE202006007672U1 (de) * 2005-12-22 2007-02-08 Allweiler Ag Kreiselpumpe, insbesondere Spiralgehäuse-Kreiselpumpe mit Dichtsystem
JP2020056360A (ja) * 2018-10-02 2020-04-09 株式会社荏原製作所 ライナーリングおよび回転機械

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Publication number Publication date
EP4098883B1 (fr) 2024-07-24
LU500237B1 (de) 2022-12-02

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