EP0119517B1 - Dishwashing machine with alternated supply of the rotating collectors - Google Patents
Dishwashing machine with alternated supply of the rotating collectors Download PDFInfo
- Publication number
- EP0119517B1 EP0119517B1 EP84102079A EP84102079A EP0119517B1 EP 0119517 B1 EP0119517 B1 EP 0119517B1 EP 84102079 A EP84102079 A EP 84102079A EP 84102079 A EP84102079 A EP 84102079A EP 0119517 B1 EP0119517 B1 EP 0119517B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dishwashing machine
- machine according
- impeller
- water
- pressure chamber
- 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
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
- A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
-
- 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
- F04D29/086—Sealings especially adapted for liquid pumps
Definitions
- One of the main problems related to dishwashing machines is how to cut down the energy consumption and to that end certain types of dishwashing machines with more than one wash basket provide for supplying alternately the two rotating spraying arms.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Washing And Drying Of Tableware (AREA)
Description
- The present invention relates to a dishwashing machine comprising a work programme controller, a wash chamber, a number of inlet pipes, at least two rotating spraying arms fitted inside the wash chamber, water pump means including an electric motor and two water pumping units, each unit being connected to a pipe supplying one of the said rotating spraying arms.
- One of the main problems related to dishwashing machines is how to cut down the energy consumption and to that end certain types of dishwashing machines with more than one wash basket provide for supplying alternately the two rotating spraying arms.
- In this way, without impairing the device efficiency for a given wash cycle, the amount of water required for wash steps is smaller and a less powerful wash pump can be used, reducing electricity consumption both for operating the pump motor and heating the water.
- A number of devices are also known to alternately supply the two rotating spraying arms mentioned above, but they present the drawback of having to be controlled from outside the inlet pipes, raising the obvious problem of sealing said pipes to withstand the internal pressure exerted by the water at the point where the control device comes out.
- A further drawback is caused by the seizing up or jamming of the control device caused by food waste and scale in the wash water in the form of detritus. During the wash operation, these matters get inside the sealing points so as to cause the said seizing up when the water is drained off and the inside parts of the appliance dry off.
- Moreover, a functional complication the said devices usually cause is that the control device is generally driven by an additional electric motor or electromagnet.
- It is also known (see patent US-A-4.004.600 by Corn) the use of devices presenting two centrifugal impellers splined to the same shaft of an electric motor. In said embodiment a one-direction electric motor is used and the two centrifugal impellers are placed at different heights, consequently according to the quantity of water present in the tank both the impellers or only the lower one work. In this way in the standard device cycle both the spray nozzles are supplied, whereas in the economy wash cycle only the lower spray arm is feeded. The quantity of water present in the tank is determined by the dishwashing machine timer depending if the wash cycle chosen is standard or economy, so that according to said choice both the spray nozzles work at the same time during the standard cycle or only the lower one during the economy cycle.
- It is also known (see patent US-A-3.179.307 by Duncan) the use of a reversible electric motor with two impellers, one for the water inlet in the wash tank when the motor turns in a first direction of rotation and the other for the wash water outlet when the motor turns in a second direction of rotation.
- It is also known (see German Patent application DE-A-2 304 035) the use of two separate impellers, one for supplying water to the upper spraying arm, and the other for supplying water to the lower spraying arm.
- However these known devices do not give any teaching how to solve in a simple way the problem of the alternated supply of the lower rotating spraying arm and of the upper rotating spraying arm during the same wash cycle in order to reduce the quantity of water present in the tank and consequently the consumptions for all the wash cycles.
- Thus aim of the present invention is to show a dishwashing machine avoiding the abovesaid drawbacks and to indicate a very simple and reliable way to obtain the alternated supply of the rotating spraying arms during a wash cycle, without the help of any device external as to the water supply pipes.
- With these aims in view the present invention relates to a dishwashing machine comprising a work programme controller, a wash chamber, a number of inlet pipes, at least two rotating spraying arms fitted inside the wash chamber, water pump means including an electric motor and two water pumping units, each unit being connected to a pipe supplying one of the said rotating spraying arms, characterized in that said two water pumping units are combined in such a way that they are selectively activated or deactivated depending on the direction of rotation of said electric motor.
- Further aims and advantages of the present invention will be clear from the following detailed description and the attached drawings, provided by way of an explanatory and nonlimiting example, in which:
- figure 1 shows a cross section of the dishwashing machine subject of the present invention;
- figure 2a shows a cross section and figures 2b and 2c two orthogonal projections of a variation of the present invention,
- figure 3 shows an axial section of the variation shown in figure 2 and
- figure 4 shows an axial section, 90° turned as to the section of figure 3, of the variation shown in figure 2.
- With reference to fig. 1, it shows a sump 1 of a dishwashing machine, separated from the wash chamber (not visible in the figure) by means of a
filter 2, in which the wash water is stored, and having at its bottom an outlet 3 which ramifies in a first pipe 4 andsecond pipe 5. - The first pipe 4 ends in an
inlet 6 of an upper pressure chamber 7, which has also alateral outlet 8, whereas thesecond pipe 5 ends in an inlet 9 of alower pressure chamber 10, which has also alateral outlet 11. - Pressure chambers 7 and 9 are superimposed and communicating and have their two
inlets 6 and 9 in their lower central side, while from theirlateral outlets pipes - Connecting
pipe 12 for example can supply the upper rotating spraying arm, while connectingpipe 13 can supply the lower rotating spraying arm. - Inside the upper pressure chamber 7 it is fitted an upper
centrifugal impeller 14 and inside the lower pressure chamber 9 it is fitted a lowercentrifugal impeller 15. - The paddles of the two centrifugal impellers are directed toward opposite directions, both protrude downwardly and are splined coaxially on the
same shaft 16 of anelectric motor 17, commanded by awork programme controller 18 of the dishwashing machine. - The
electric motor 17 is placed laterally to sump 1, theshaft 16 of which is downwardly directed, and is fastened to the same sump 1 in a known way. - While functioning, the
motor 17 is commanded by thework programme controller 18 of the dishwashing machine, which "decides", according to the programme chosen by the user, when, how long and in which direction it must turn. - It is obvious that when two centrifugal impellers with their opposite-directed and integrally connected paddles rotate in opposite directions, only one at a time is "working" since the impeller, which rotates in the direction opposite to the paddles direction, is idle because it does not create any pressure in the inlet pipe. Moreover it must be remembered that a number of pipes suitable to allow the air in, ease the dispriming of the "active" centrifugal impeller when the reversal of the motion of rotation occurs.
- Consequently, when the direction of rotation of the
electric motor 17 is reversed, also the centrifugal impeller, which pumps water, is changed: for example when theelectric motor 17 turns clockwise, the uppercentrifugal impeller 14 works and the water is pumped to the upper rotating spraying arm, but when theelectric motor 17 turns counterclockwise it is the lowercentrifugal impeller 15 that works and the water is pumped to the lower rotating spraying arm. - In this way, by means only of the
work programme controller 18 command, which is consequently planned and built to carry out such inversion at the desired intervals, the direction of rotation of theelectric motor 17 is reversed, and as a consequence the desired alternation in the supply of the two rotating spraying arms is obtained without any auxiliary device external to the water inlet pipes from sump 1 to the rotating spraying arms. - With reference to figures 2a, 2b and 2c, which show a variation to the alternated supply device as shown in the previous figure, we can see an
impeller 21 consisting of a single piece with ahole 22 in the middle, across which said impeller is splined to theshaft 16 of theelectric motor 17, anupper section 23 consisting of a number ofradial blades 24, (that can be seen better in the top view showed in figure 2c), alower section 25 including a number ofhelical blades 26, (that can be seen better in the bottom view shown in figure 2b). Theupper section 23 of theimpeller 21 includes also a firstprotruding collar 27, a second one 28 and a third one 29 whose function will be better explained afterwards. Thelower section 25 of theimpeller 21 is fundamentally represented by aflat ring 30 placed underhelical blades 26, saidflat ring 30 having also ahole 31 in its middle part for the wash water inlet. - From figure 3, in which the same particulars of figure 2 are indicated using the same numbers, we can see that the
impeller 21 is placed inside a space between asump 32 and acover 33, both having a number ofclearance holes impeller 21. Thecover 33, has in its inner part in correspondence to the first 27 and the second 28 collar of theimpeller 21, a first 36 and a second 37 protruding collar, which together with the first 27 and the second 28 collar of theimpeller 21 form alabyrinth course 38 separating afirst pressure chamber 39 from asecond pressure chamber 40. - Figure 4, in which the same particulars of the above figures are indicated using the same numbers, shows an inlet pipe 42 for wash water, flowing into the central lower part of the
first pressure chamber 39 and afirst outlet pipe 43 which branches off at a side of thepressure chamber 39 itself allowing the wash water to reach a first rotating spraying arm of the dishwashing machine, not shown in the figure. Asecond inlet pipe 44 for the wash water flowing into the upper central part of thesecond pressure chamber 40 and asecond outlet pipe 45 which branches off at a side of thepressure chamber 40 itself and allows the wash water to reach a second rotating spraying arm of the dishwashing machine, not shown in the figure. Both the twoinlet pipes 42 and 44 draw the water from the wash tank 1. Besides it is visible a nut 46 used to fasten theimpeller 21 to theshaft 16 of theelectric motor 17. - The device for the alternated supply of the rotating spraying arms described in the present variation works as follows: when the electric motor turns, it makes the
impeller 21 turn too, while thesump 32 and thecover 33 stand still so that the first 27 and the second 28 collar of theimpeller 21 move within the first 36 and the second 37 collar of thecover 33. Thehelical blades 26 are set in such a way that in a first direction of rotation (clockwise for example) they work, consequently the wash water coming from the inlet pipe 42 is pumped from thefirst pressure chamber 39 to theoutlet pipe 43 and from the latter to the first rotating spraying arm. Of course in the meantime also theradial blades 24 of theimpeller 21 are turning, but theinlet pipe 44 and theoutlet pipe 45 are positioned so that by means of this first direction of rotation of theelectric motor 17 theradial blades 24 would suck the water (supposing that there is any) from theoutlet pipe 45, which is connected with the second rotating spraying arm, for carrying it inside thesecond pressure chamber 40. Thus in this first direction of rotation no water is sent to the second rotating spraying arm. Thelabyrinth course 38 separating thefirst pressure chamber 39 from thesecond pressure chamber 40 limits the transfers of wash water from saidsecond pressure chamber 40 to saidfirst pressure chamber 39. - When the electric motor is caused to turn in a direction opposite to the former (counterclockwise for example), by means of a proper timer control, the
helical blades 26 do not work and no water is sent to the first rotating spraying arm, whereas theradial blades 24 pump the water coming from thesecond inlet pipe 44 from thesecond pressure chamber 40 to thesecond outlet pipe 45 and from this to the second rotating spraying arm. In this wash phase too thelabyrinth course 38 limits the transfer of water from thefirst pressure chamber 39 to thesecond pressure chamber 40 and therefore there is no mutual interference in the supply of the two rotating spraying arms. - In another variation the
upper section 23 of theimpeller 21 may have a number of helical blades set in a direction opposite as to those ones of itslower section 25. - In a further variation a number of holes may be done in the
first outlet pipe 43 of thefirst pressure chamber 39 and in thesecond outlet pipe 45 of thesecond pressure chamber 40, in such a way that from such holes a certain amount of air may come in such section of theimpeller 21, making the dispriming easier, when the relative section of theimpeller 21 placed inside saidsecond pressure chamber 40 turns in the direction in which it has not to work. - From the description made, the advantages of the dishwashing machine with alternated supply of the rotating spraying arms being subject of the present invention result clear. In particularthey are represented by the fact that said alternated supply is obtained without adding any device external to the water inlet pipes by means of a simple reverse of the motion of the electric motor, by the fact of having an en bloc double impeller which takes the place of two distinct impellers, by the fact of having a labyrinth course between the two pressure chambers limiting the wash water transfers and by the fact of having quite small dimensions, lower production and mounting costs in respect of the known technique.
- Obviously numerous other variations are possible, for the man skilled in the art, to the dishwashing machine with alternated supply of the rotating spraying arms being subject of the present invention without, however, departing from the scope of the present invention.
Claims (19)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67236/83A IT1162832B (en) | 1983-03-02 | 1983-03-02 | Dishwashing machine with alternated supply of rotating collectors |
IT6723683 | 1983-03-02 | ||
IT6774883 | 1983-07-11 | ||
IT67748/83A IT1162901B (en) | 1983-07-11 | 1983-07-11 | Dishwashing machine with alternated supply of rotating collectors |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0119517A1 EP0119517A1 (en) | 1984-09-26 |
EP0119517B1 true EP0119517B1 (en) | 1988-10-05 |
Family
ID=26329740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84102079A Expired EP0119517B1 (en) | 1983-03-02 | 1984-02-28 | Dishwashing machine with alternated supply of the rotating collectors |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0119517B1 (en) |
DE (1) | DE3474406D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4209490A1 (en) * | 1992-03-24 | 1993-09-30 | Licentia Gmbh | Liquid pump esp. circulating pump for rinsing liquid in dishwasher - has pump impeller of plastic and its blades on one side are arranged on closed circular disc and on other side covered with circular ring disc with central opening |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1096205B (en) * | 1958-01-30 | 1960-12-29 | Paul Bungartz | Centrifugal pump with auxiliary conveyor wheel |
NL134030C (en) * | 1961-05-05 | |||
US3099992A (en) * | 1961-11-28 | 1963-08-06 | Gen Motors Corp | Reversible pump-motor assembly for a dishwasher |
US3127839A (en) * | 1961-12-11 | 1964-04-07 | Gen Electric | Clothes washer with improved turbine type pump |
US3179307A (en) * | 1963-10-24 | 1965-04-20 | Design & Mfg Corp | Pump assembly for dishwashing machines |
US3301188A (en) * | 1964-06-18 | 1967-01-31 | Sta Rite Products Inc | Pump |
US3294102A (en) * | 1964-12-09 | 1966-12-27 | Whirlpool Co | Dishwashing apparatus having improved pump means |
FR1540245A (en) * | 1966-10-11 | 1968-09-20 | Candy Spa | Improvements in dishwashing machines and the like |
DE1933672A1 (en) * | 1969-07-02 | 1971-01-14 | Moczala Dr Ing Helmut | Motor-pump unit |
DE2164126A1 (en) * | 1971-12-23 | 1973-07-05 | Siemens Ag | CENTRIFUGAL PUMP |
DE2304035C2 (en) * | 1973-01-27 | 1983-02-24 | Miele & Cie GmbH & Co, 4830 Gütersloh | Method for washing dishes in a dishwasher |
US4004600A (en) * | 1975-02-03 | 1977-01-25 | Whirlpool Corporation | Dishwasher with special low washing liquid usage cycle |
-
1984
- 1984-02-28 EP EP84102079A patent/EP0119517B1/en not_active Expired
- 1984-02-28 DE DE8484102079T patent/DE3474406D1/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4209490A1 (en) * | 1992-03-24 | 1993-09-30 | Licentia Gmbh | Liquid pump esp. circulating pump for rinsing liquid in dishwasher - has pump impeller of plastic and its blades on one side are arranged on closed circular disc and on other side covered with circular ring disc with central opening |
Also Published As
Publication number | Publication date |
---|---|
DE3474406D1 (en) | 1988-11-10 |
EP0119517A1 (en) | 1984-09-26 |
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