EP0626477B1 - Trappe - Google Patents

Trappe Download PDF

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Publication number
EP0626477B1
EP0626477B1 EP94303656A EP94303656A EP0626477B1 EP 0626477 B1 EP0626477 B1 EP 0626477B1 EP 94303656 A EP94303656 A EP 94303656A EP 94303656 A EP94303656 A EP 94303656A EP 0626477 B1 EP0626477 B1 EP 0626477B1
Authority
EP
European Patent Office
Prior art keywords
slots
flow
flow duct
coins
fluid flow
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
EP94303656A
Other languages
German (de)
English (en)
Other versions
EP0626477A1 (fr
Inventor
Jeffrey Williams
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.)
Hoover Ltd
Original Assignee
Hoover Ltd
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
Priority claimed from GB939310618A external-priority patent/GB9310618D0/en
Application filed by Hoover Ltd filed Critical Hoover Ltd
Publication of EP0626477A1 publication Critical patent/EP0626477A1/fr
Application granted granted Critical
Publication of EP0626477B1 publication Critical patent/EP0626477B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/10—Filtering arrangements

Definitions

  • This invention relates to a trap device, for trapping coins entrained in the outflow of a washing machine.
  • Filters can be fitted to prevent the drain pump becoming jammed or blocked in this way. However these filters become clogged and can block the pump unless they are cleaned regularly. Many washing machine manufacturers therefore prefer not to fit such filters to their washing machines.
  • British Patent Specification No. 1 346 571 discloses a washing machine drain pump having a tubular inlet which tapers inwardly in the direction of flow of water into the pump. Coins entrained in the flow of water become trapped by the tapering inlet and will be prevented from entering the pump. These coins lodge across the tapering inlet, either directly across or at an angle e.g. greater than 45° to the direction of flow, and therefore three elongate ribs are provided on the tapering inlet to hold the coins away from its wall and ensure that a small passage remains around the coins for the flow of water. However, the coins still lodge across the inlet and severely restrict the flow of water out of the washing machine during the rest of the operating cycle.
  • a device for trapping coins entrained in the outflow of a washing machine comprising a flow duct which tapers in the direction of fluid flow, said flow duct being formed with a plurality of slots which extend along the duct in the direction of fluid flow, characterised in that said flow duct is formed with at least six said slots such that any coin which is entrained in the fluid flow, and is of a diameter within a predetermined range, will become lodged with opposite edge portions thereof in spaced-apart said slots and in a plane which extends substantially in the direction of fluid flow.
  • the trap device may form the inlet of a washing machine drain or recirculation pump. Instead, the device may be separate from the pump and fitted into the flow pipe upstream of the pump.
  • the trap device is arranged so that coins at least within a diameter range of 20 to 26mm will lodge at an angle of less than 25° to the axis of the tapered duct.
  • Any coin which becomes lodged in the trap device will be held substantially edge-on to the direction of fluid flow, and will therefore not unduly restrict the flow of fluid.
  • the flow duct is preferably frusto-conical for at least a major part of its length.
  • the cone angle of the flow duct is in the range of 30 to 45°.
  • the width of the slots preferably reduces in the direction of fluid flow so that smaller coins, which are also generally thinner, also lodge with their planes extending in substantially the direction of fluid flow.
  • the angle at which a coin lodges depends on several factors including the width of the slots, the thickness of the coin, the angle of taper of the flow duct, and the diameters of the opposite ends of the flow duct of the device.
  • the flow duct of the device has a diameter in the range of 26-40mm at its wider end, i.e. at its upstream end.
  • the flow duct has a diameter in the range of 15 - 25mm at its narrower end, i.e. at its downstream end.
  • Coins which are smaller than the diameter of the narrower end of the flow duct are able to pass straight through the device and into the pump: however, such small coins are able to pass through and out of the pump without causing any harm to the pump impeller.
  • the flow duct of the device has six to ten said slots.
  • the flow duct may have eight said slots.
  • the slots may be of substantially uniform depth along the length of the flow duct, in which case the slots may be represented by the spaces between a plurality of elongate ribs formed on a frusto-conical surface.
  • the slots may progressively deepen, in the direction of fluid flow, but are closed at their downstream ends.
  • FIG. 1 and 2 of the drawings there is shown a moulded plastics pump chamber housing of a washing machine drain pump.
  • the pump further comprises an electrical motor having a centrifugal type impeller fitted to its output shaft and the impeller projects into a cylindrical chamber 10 formed inside the housing: the motor and impeller are omitted from the drawings.
  • the housing is generally cup-shaped, and comprises a circular end wall 11 and a cylindrical side wall 12 projecting from it.
  • a tubular inlet 13 projects axially from the end wall 11 and a tubular outlet 14 projects tangentially from the side wall 12.
  • the inlet 13 of the pump connects to the sump portion of a washing machine drum assembly via an elastomeric hose.
  • the outlet 14 connects to the drain outlet of the washing machine.
  • the tubular inlet 13 forms a trap device in accordance with this invention.
  • the wall of the tubular inlet 13 is progressively thicker towards the end wall 11 of the housing, so that its inner peripheral surface is frusto-conical.
  • the frusto-conical surface faces away from the housing, i.e. in a direction opposite to the direction F of water flow.
  • a plurality of elongate ribs 15 (e.g. eight such ribs) extend in a generally axial direction along the frusto-conical peripheral wall of the inlet 13.
  • the ribs are equally spaced apart, so that identical slots 16 are formed between adjacent pairs of ribs 15.
  • the slots 16 are arranged in diametrically opposite pairs.
  • the ribs 15 are triangular in section and taper inwardly at their inner and outer ends.
  • the outer end 17 of the ribs 15 projects axially from the inlet 13, so that when a hose is fitted to the inlet 13 the slots 16 commence prior to the inlet 13.
  • the ribs 15 are generally parallel-sided along their length, thus each slot 16 progressively narrows towards the chamber 10 owing to the frusto-conical shape of the inlet 13.
  • the inlet 13 tapers from a diameter of 35mm at is upstream end to a diameter of 18mm at its downstream end, where it is connected to the end wall 11.
  • the inlet 13 is approximately 25mm in length, thus the angle of taper is approximately 37.5°.
  • any coins entrained in the water being pumped out of the washing machine will enter the inlet 13 to the pump.
  • the water flow tends to be quite turbulent, thus the coins could be oriented at any angle when they enter the inlet.
  • the ribs 15 and the tapering shape of the inlet 13 serve to orientate the coins 30 so that they become lodged, in a stable position, with their planes extending substantially in the direction of water flow, i.e. edge-on to the water flow.
  • Any coins having a diameter less than the narrower part of the inlet 13 i.e. 18mm
  • the clearance between the impeller and the walls 11, 12 of the chamber 10 is sufficient to allow these smaller coins to pass directly through the pump without harm.
  • the trapped coins 30 may become lodged diametrically across the inlet 13 with their opposite edge portions in opposite slots 16. Alternatively coins 30 may become lodged along a chord across the inlet 13.
  • the water flow rate will reduce as the number of trapped coins increases, but in practice only one or two coins may get trapped in the pump inlet of a machine during its life. These trapped coins will therefore not substantially affect the rate at which water is pumped out of the machine.
  • Figure 4 shows a modified form for the tubular inlet 13.
  • This still forms a flow duct which tapers in the direction of fluid flow (being defined by the radially inner surfaces of the ribs 15), with a plurality of slots 16 extending along the duct in the direction of fluid flow (the slots 16 alternating with the ribs 15).
  • the slots 16 become progressively deeper in the direction of fluid flow, the inner or bottom surfaces of the slots 16 lying on a newly-cylindrical surface coaxial with the outer cylindrical surface of the tubular inlet 13.
  • the downstream ends of the slots 16 are closed by an annular wall 11a, leaving the flow duct with a central circular opening 13a.
  • the final portion of the flow duct, leading up to the opening 13a is parallel-sided, i.e. the radially inner edges of the ribs 15 are parallel-sided over this final portion.
  • the modified tubular inlet of Figure 4 is the same as the tubular inlet of Figures 1 to 3. However, because the wall thickness of the tubular inlet 13 of Figure 4 is, on average, somewhat less than in the tubular inlet of Figures 1 to 3, it presents less difficulties in moulding.
  • FIG. 1 shows a trap device in accordance with the invention, forming the inlet of a washing machine drain pump.
  • the trap device may be separate from the pump and fitted into the drain pipe upstream of the pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Claims (12)

  1. Dispositif de récupération de pièces de monnaie entraínées dans le flux de sortie d'une machine à laver, ledit dispositif comprenant un tuyau d'écoulement qui se rétrécit dans le sens de l'écoulement de fluide (F), ledit tuyau d'écoulement étant formé avec une pluralité de fentes (16) qui s'étendent le long du tuyau dans le sens de l'écoulement de fluide (F), caractérisé en ce que ledit tuyau d'écoulement est formé avec au moins six desdites fentes (16), de telle sorte que toute pièce de monnaie qui est entraínée dans l'écoulement de fluide, et dont le diamètre est dans une plage prédéterminée, viendra se loger, par des portions de bord opposées de celle-ci, dans lesdites fentes espacées et dans un plan qui s'étend substantiellement dans le sens de l'écoulement de fluide (F).
  2. Dispositif selon la revendication 1, caractérisé en ce qu'il est arrangé de telle sorte que des pièces de monnaie ayant au moins un diamètre entre 20 et 26 mm viendront se loger selon un angle de moins de 25° par rapport au sens de l'écoulement de fluide (F).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la largeur des fentes (16) diminue dans le sens de l'écoulement de fluide (F).
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le tuyau d'écoulement a une forme tronconique sur au moins une majeure partie de sa longueur.
  5. Dispositif selon la revendication 4, caractérisé en ce que l'angle au sommet du cône dudit tuyau d'écoulement est dans la plage entre 30 et 45°.
  6. Dispositif selon les revendications 4 ou 5, caractérisé en ce que le tuyau d'écoulement a un diamètre dans la plage de 26 à 40 mm au niveau de son extrémité amont plus large.
  7. Dispositif selon l'une quelconque des revendications 4 à 6, caractérisé en ce que le tuyau d'écoulement a un diamètre dans la plage de 15 à 25 mm au niveau de son extrémité aval plus étroite.
  8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit tuyau d'écoulement est formé avec six à dix desdites fentes (16).
  9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdites fentes (16) ont une profondeur substantiellement uniforme sur le long de la longueur du tuyau d'écoulement.
  10. Dispositif selon la revendication 9, caractérisé en ce que lesdites fentes (16) sont formées par une pluralité de nervures allongées (15) formées sur une surface tronconique dudit tuyau d'écoulement.
  11. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que les fentes (16) deviennent progressivement plus profondes, dans le sens de l'écoulement de fluide (F), mais sont fermées à leur extrémité aval.
  12. Pompe de machine à laver ayant une entrée qui comporte un dispositif de récupération des pièces de monnaie entraínées dans le flux de sortie de la machine à laver, caractérisée en ce que ledit dispositif comprend un dispositif selon l'une quelconque des revendications précédentes.
EP94303656A 1993-05-22 1994-05-23 Trappe Expired - Lifetime EP0626477B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB939310618A GB9310618D0 (en) 1993-05-22 1993-05-22 Trap device
GB9310618 1993-05-22
GB9318642 1993-09-08
GB9318642A GB2278067B (en) 1993-05-22 1993-09-08 Trap device

Publications (2)

Publication Number Publication Date
EP0626477A1 EP0626477A1 (fr) 1994-11-30
EP0626477B1 true EP0626477B1 (fr) 1998-07-15

Family

ID=26302931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94303656A Expired - Lifetime EP0626477B1 (fr) 1993-05-22 1994-05-23 Trappe

Country Status (2)

Country Link
EP (1) EP0626477B1 (fr)
DE (1) DE69411633T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8516859B2 (en) 2009-12-21 2013-08-27 Whirlpool Corporation Foreign object trap for an automatic washer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100560987C (zh) * 2006-06-01 2009-11-18 于国强 改进的离心排水泵泵壳

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228525A (en) * 1962-02-20 1966-01-11 Whirlpool Co Button trap for a laundry appliance
DE2110444A1 (de) * 1970-03-05 1971-09-23 Hoover Ltd Zentrifugalpumpe fuer Waschmaschinen
FR2116633A5 (fr) * 1970-12-01 1972-07-21 Sedelem
US4485645A (en) * 1982-09-30 1984-12-04 Whirlpool Corporation Foreign objects trap for automatic washer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8516859B2 (en) 2009-12-21 2013-08-27 Whirlpool Corporation Foreign object trap for an automatic washer

Also Published As

Publication number Publication date
DE69411633T2 (de) 1999-04-01
EP0626477A1 (fr) 1994-11-30
DE69411633D1 (de) 1998-08-20

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