WO2004029464A1 - A suction diffuser - Google Patents

A suction diffuser Download PDF

Info

Publication number
WO2004029464A1
WO2004029464A1 PCT/GB2003/004142 GB0304142W WO2004029464A1 WO 2004029464 A1 WO2004029464 A1 WO 2004029464A1 GB 0304142 W GB0304142 W GB 0304142W WO 2004029464 A1 WO2004029464 A1 WO 2004029464A1
Authority
WO
WIPO (PCT)
Prior art keywords
strainer
housing
suction diffuser
pump
inlet
Prior art date
Application number
PCT/GB2003/004142
Other languages
French (fr)
Inventor
Colin Evans
Original Assignee
Crane Limited
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 Crane Limited filed Critical Crane Limited
Priority to AU2003267634A priority Critical patent/AU2003267634A1/en
Publication of WO2004029464A1 publication Critical patent/WO2004029464A1/en

Links

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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Definitions

  • the present invention relates to a suction diffuser. It is intended particularly but not exclusively for use in liquid pumping systems where the pump is of the centrifugal type. There is a general requirement in pumping systems for the conditioning of the liquid before entering the suction side of the pump to ensure that the liquid is clean and that its flow velocity is reasonably uniform. This is to avoid damage to the pump from solid particles in suspension and from irregular flow patterns which can cause damage to the impeller and impair pump performance. These requirements are satisfied by the fitting of a strainer valve upstream of the pump and the provision of a length of pipe and a long sweeping bend between strainer valve and pump inlet to achieve as close to fully developed flow as the space will allow.
  • the cylindrical strainer element is positioned co-axially and horizontally with the bore of the pump inlet. Liquid flow enters the fitting vertically downwards and passes through the strainer element from the outside surface to the inside and then into the pump.
  • the strainer element is cylindrical and is coaxially arranged with the inlet of the strainer.
  • Flow straighteners may be fitted between the strainer element and the pump.
  • a drain is provided in the strainer to enable material collected by the element to be removed from the strainer.
  • the drain may comprise a plug arranged coaxial with or parallel to the strainer element.
  • Magnets may be provided to facilitate removal of magnetic material.
  • the strainer housing advantageously comprises a removable cover to enable access to the strainer element.
  • the strainer element may be provided with handles to facilitate insertion into and removal from the strainer housing.
  • the strainer may be provided with a support to alleviate strain on the body of the pump.
  • FIG. 1 diagrammatically shows a known suction diffuser arrangement
  • Figure 2 shows a further known suction diffuser arrangement
  • Figure 3 shows a suction diffuser arrangement according to the invention.
  • FIG. 1 illustrates the first prior art arrangement referred to in the introductory part of the specification.
  • a strainer 1 is disposed upstream of a centrifugal pump 3 and is connected to that pump via a length of pipe incorporating a long sweeping bend 2. Liquid enters via a flow inlet 4 to the strainer 1 and exists via outlet 5 from the centrifugal pump.
  • This arrangement is disadvantageous because it occupies a large amount of space.
  • FIG 2 illustrates the second prior art arrangement referred to in the introductory part of the specification.
  • the long sweeping bend 2 of the arrangement of figure 1 has been replaced by a compact 90°fitting 6 in which the strainer comprising a strainer element 7 is fitted.
  • Flow straighteners 8 compensate for the absence of the bend.
  • the disadvantage here is that material 9 accumulates in the restricted space 10 between the strainer element of the housing surrounding it restricting flow.
  • FIG 3 which shows an embodiment of the invention, cylindrical strainer element 11 is arranged within the housing 12 (in the form of a 90 " fitting) of the strainer with its axis in line with the direction of inlet flow into the strainer (in this case vertical).
  • the incoming (contaminated) liquid therefore flows first into the interior of the cylindrical strainer element 11 and then out through the element to the exterior of the element in the direction of arrows 13. Particles suspended in the liquid are retained within the cylindrical element where there is more space and sink to the base of the element at 14 where they may be removed via a drain plug 15 in the strainer housing 12.
  • the plug 15 may be disposed coaxial with or parallel to the axis of the element 11. Collected particles may be blown out and magnets may be provided to assist in the removal of metal particles.
  • Flow straighteners 16 are disposed adjacent the inlet of the centrifugal pump 3.
  • a bolted cover 17 is attached to the strainer housing 12.
  • the element 11 is fitted with handles 19 for ease of inserting and removal. This enables "start up" elements to be fitted and removed after commissioning a system.
  • a pipe support 18 is provided on the base of the device to alleviate any strain on the body of the centrifugal pump 3. With the above described arrangement a much greater space is provided for the collection of material and its removal is facilitated. The restricted space between the strainer element and surrounding strainer body is kept free of the material thus avoiding any resultant restriction of the flow.

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

Abstract

A suction diffuser comprising a housing (12) and a strainer element (11). The element (11) is arranged within the housing (12) with its axis in line with the direction of inlet flow into the strainer so that, in operation, incoming contaminated liquid flows first into the interior of the element (11) and then out through the element to the exterior thereof. Particles suspended in the liquid are retained within the element, where there is more space, and sink to the base of the element where they may be removed via a drain plug (15) in the housing (12). In this way the restricted space between the element and surrounding body of the strainer is kept free of material thus avoiding any resultant restriction of the flow.

Description

A SUCTION DIFFUSES, The present invention relates to a suction diffuser. It is intended particularly but not exclusively for use in liquid pumping systems where the pump is of the centrifugal type. There is a general requirement in pumping systems for the conditioning of the liquid before entering the suction side of the pump to ensure that the liquid is clean and that its flow velocity is reasonably uniform. This is to avoid damage to the pump from solid particles in suspension and from irregular flow patterns which can cause damage to the impeller and impair pump performance. These requirements are satisfied by the fitting of a strainer valve upstream of the pump and the provision of a length of pipe and a long sweeping bend between strainer valve and pump inlet to achieve as close to fully developed flow as the space will allow.
The disadvantage of this arrangement is the large space required to accommodate the straight length of pipe and long sweeping bend. A prior solution to this arrangement is to replace the long sweeping bend with a compact 90 "fitting and simultaneously, incorporate the strainer valve element in the fitting. Providing flow straighteners in the outlet port of the fitting to the inlet of the pump compensates for the absence of the long sweeping bend.
In this solution the cylindrical strainer element is positioned co-axially and horizontally with the bore of the pump inlet. Liquid flow enters the fitting vertically downwards and passes through the strainer element from the outside surface to the inside and then into the pump.
Such arrangements are susceptible to particles in the liquid accumulating in the limited geometry around the strainer element and restricting flow. The space around the element is dependent on the body cavity dimensions and in practice, is insufficient to allow continual collection of particles, which should fall freely around the external surface of the element to the internal base of the device. Experience has indicated that this is not always consistent. It is an object of the present invention to mitigate or eliminate this disadvantage.
According to the present invention, there is provided a suction diffuser for use in a liquid pumping system comprising a pump having an inlet and an outlet and strainer having a housing and a strainer element disposed in the housing and an inlet and an outlet connected to the pump in which the strainer element is arranged in relation to the inlet of the strainer so that in use liquid flows through the strainer element and into the housing of the strainer before entering the pump.
In a preferred embodiment of the invention, the strainer element is cylindrical and is coaxially arranged with the inlet of the strainer. Flow straighteners may be fitted between the strainer element and the pump. A drain is provided in the strainer to enable material collected by the element to be removed from the strainer. The drain may comprise a plug arranged coaxial with or parallel to the strainer element. Magnets may be provided to facilitate removal of magnetic material. The strainer housing advantageously comprises a removable cover to enable access to the strainer element. The strainer element may be provided with handles to facilitate insertion into and removal from the strainer housing. The strainer may be provided with a support to alleviate strain on the body of the pump. In order that the invention may be more clearly understood, one embodiment thereof will now be described, by way of example, with reference to the accompanying drawings, in which:-
Figure 1 diagrammatically shows a known suction diffuser arrangement, Figure 2 shows a further known suction diffuser arrangement, and
Figure 3 shows a suction diffuser arrangement according to the invention.
Figures 1 illustrates the first prior art arrangement referred to in the introductory part of the specification. A strainer 1 is disposed upstream of a centrifugal pump 3 and is connected to that pump via a length of pipe incorporating a long sweeping bend 2. Liquid enters via a flow inlet 4 to the strainer 1 and exists via outlet 5 from the centrifugal pump. This arrangement is disadvantageous because it occupies a large amount of space.
Figure 2 illustrates the second prior art arrangement referred to in the introductory part of the specification. The long sweeping bend 2 of the arrangement of figure 1 has been replaced by a compact 90°fitting 6 in which the strainer comprising a strainer element 7 is fitted. Flow straighteners 8 compensate for the absence of the bend. The disadvantage here is that material 9 accumulates in the restricted space 10 between the strainer element of the housing surrounding it restricting flow. Referring to Figure 3, which shows an embodiment of the invention, cylindrical strainer element 11 is arranged within the housing 12 (in the form of a 90 "fitting) of the strainer with its axis in line with the direction of inlet flow into the strainer (in this case vertical). The incoming (contaminated) liquid therefore flows first into the interior of the cylindrical strainer element 11 and then out through the element to the exterior of the element in the direction of arrows 13. Particles suspended in the liquid are retained within the cylindrical element where there is more space and sink to the base of the element at 14 where they may be removed via a drain plug 15 in the strainer housing 12. The plug 15 may be disposed coaxial with or parallel to the axis of the element 11. Collected particles may be blown out and magnets may be provided to assist in the removal of metal particles. Flow straighteners 16 are disposed adjacent the inlet of the centrifugal pump 3.
To provide access to the strainer element 11 a bolted cover 17 is attached to the strainer housing 12. The element 11 is fitted with handles 19 for ease of inserting and removal. This enables "start up" elements to be fitted and removed after commissioning a system. A pipe support 18 is provided on the base of the device to alleviate any strain on the body of the centrifugal pump 3. With the above described arrangement a much greater space is provided for the collection of material and its removal is facilitated. The restricted space between the strainer element and surrounding strainer body is kept free of the material thus avoiding any resultant restriction of the flow.
It will be appreciated that the above embodiment has been described by way of example only and that many variations are possible without departing from the scope of the invention.

Claims

Claims
1. A suction diffuser for use in a liquid pumping system comprising a pump having an inlet and an outlet and strainer having a housing and a strainer element disposed in the housing and an inlet and an outlet connected to the pump in which the strainer element is arranged in relation to the inlet of the strainer so that in use liquid flows through the strainer element and into the housing of the strainer before entering the pump.
2. A suction diffuser as claimed in claim 1, in which the strainer element is cylindrical and is coaxially arranged with the inlet of the strainer.
3. A suction diffuser as claimed in claim 1 or 2, in which flow straighteners are disposed between the strainer element and the pump.
4. A suction diffuser as claimed in claim 1,2 or 3, in which a drain is provided in the strainer to enable material collected by the element to be removed from the strainer.
5. A suction diffuser as claimed in claim 4, in which the drain comprises a plug arranged coaxial with or parallel to the strainer elements.
6. A suction diffuser as claimed in any preceding claim, in which magnets are provided to facilitate removal of magnetic material.
7. A suction diffuser as claimed in any preceding claim, in which the strainer housing comprises a removable cover to enable access to the strainer element.
8. A suction diffuser as claimed in any preceding claim, in which the strainer element comprises handles to facilitate insertion into and removal from the strainer housing. A suction diffuser for use in a liquid pumping system substantially as hereinbefore described with reference to Figure 3 of the accompanying drawings.
PCT/GB2003/004142 2002-09-24 2003-09-22 A suction diffuser WO2004029464A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003267634A AU2003267634A1 (en) 2002-09-24 2003-09-22 A suction diffuser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0222084A GB2395144A (en) 2002-09-24 2002-09-24 A straining device
GB0222084.6 2002-09-24

Publications (1)

Publication Number Publication Date
WO2004029464A1 true WO2004029464A1 (en) 2004-04-08

Family

ID=9944624

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2003/004142 WO2004029464A1 (en) 2002-09-24 2003-09-22 A suction diffuser

Country Status (4)

Country Link
US (1) US20040057852A1 (en)
AU (1) AU2003267634A1 (en)
GB (1) GB2395144A (en)
WO (1) WO2004029464A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009118325A1 (en) * 2008-03-28 2009-10-01 Inergy Automotive Systems Research (Société Anonyme) SCR SYSTEM FOR PURIFYING EXHAUST GASES IN NOx
US10240611B2 (en) * 2012-11-05 2019-03-26 Fluid Handling Llc Flow conditioning feature for suction diffuser
KR101646976B1 (en) * 2016-03-17 2016-08-09 주식회사 원대티지케이 Suction Diffusers
CN111577662B (en) * 2020-05-26 2021-07-13 山东华立供水设备有限公司 Water pump
CN111664128A (en) * 2020-06-22 2020-09-15 王飞飞 New energy automobile cooling water pump
CN217055725U (en) * 2022-03-11 2022-07-26 惠盈发展有限公司 Cross-linked polyethylene water pump

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GB809277A (en) * 1956-10-17 1959-02-18 Megator Pumps Compressor Improvements in liquid strainers
GB1020712A (en) * 1961-07-01 1966-02-23 John Clark Pumps Ltd Suction pump strainer suitable for draining very shallow pools of water
FR1593318A (en) * 1968-11-19 1970-05-25
EP0657602A1 (en) * 1993-12-03 1995-06-14 Bombas Electricas, S.A. (Boelsa) Centrifugal pump for water recirculation

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Publication number Priority date Publication date Assignee Title
GB809277A (en) * 1956-10-17 1959-02-18 Megator Pumps Compressor Improvements in liquid strainers
GB1020712A (en) * 1961-07-01 1966-02-23 John Clark Pumps Ltd Suction pump strainer suitable for draining very shallow pools of water
FR1593318A (en) * 1968-11-19 1970-05-25
EP0657602A1 (en) * 1993-12-03 1995-06-14 Bombas Electricas, S.A. (Boelsa) Centrifugal pump for water recirculation

Also Published As

Publication number Publication date
AU2003267634A1 (en) 2004-04-19
GB2395144A (en) 2004-05-19
US20040057852A1 (en) 2004-03-25
GB0222084D0 (en) 2002-10-30

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