US3288372A - Non-clogging dishwasher arm orifices forming a fan-like vena contracta spray pattern - Google Patents

Non-clogging dishwasher arm orifices forming a fan-like vena contracta spray pattern Download PDF

Info

Publication number
US3288372A
US3288372A US392655A US39265564A US3288372A US 3288372 A US3288372 A US 3288372A US 392655 A US392655 A US 392655A US 39265564 A US39265564 A US 39265564A US 3288372 A US3288372 A US 3288372A
Authority
US
United States
Prior art keywords
spray
opening
vena contracta
fluid
openings
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
US392655A
Other languages
English (en)
Inventor
Donald S Cushing
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US392655A priority Critical patent/US3288372A/en
Priority to GB32621/65A priority patent/GB1077155A/en
Priority to FR28028A priority patent/FR1442945A/fr
Priority to CH1187665A priority patent/CH451425A/de
Priority to DEG32919U priority patent/DE1926826U/de
Priority to DE19651503792 priority patent/DE1503792A1/de
Priority to DK440265AA priority patent/DK116960B/da
Application granted granted Critical
Publication of US3288372A publication Critical patent/US3288372A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • A47L15/4278—Nozzles
    • 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
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
    • A47L15/22—Rotary spraying devices
    • A47L15/23—Rotary spraying devices moved by means of the sprays

Definitions

  • the device in order for such a device to be successful in a dishwasher, the device must be capable of passing relatively large food particles.
  • the spray device in a dishwasher must handle a fluid having food particles as large as a kernel of corn or a green pea entrained therein without clogging or seriously interrupting the spray configuration. Therefore, most of the devices for achieving a sheet-like spray proposed heretofore have been unsuitable for use in a dishwasher.
  • a spray device for use in an automatic dishwasher including a wall defining a fluid passageway.
  • the wall has an interior surface facing the passageway and a dihedral angle of less than 180 is formed in at least a portion of the interior surface of the wall.
  • An opening is formed through the wall at the apex of the dihedral angle.
  • the effective cross sectional area of the jet or spray is that of the vena contracta; however, whenever a foreign object such as a food particle is attempting to pass through the spray device, the opening will pass any object up to the dimension of the opening. Therefore, a spray device constructed in accordance with the present invention achieves the aforementioned objects.
  • FIGURE 1 is an elevational view, partially cut away to show details, of a conventional dishwasher with which the present invention may be employed;
  • FIGURE 2 is a partial sectional view taken along line 22 of FIGURE 1;
  • FIGURE 3 is a sectional view taken along line 33 of FIGURE 2;
  • FIGURE 4 is an enlarged view showing details of the present invention.
  • FIGURE 5 is a view similar to FIGURE 4 showing the invention employing a relatively thick material
  • FIGURE 6 is a view of the device of FIGURE 5 as seen from above in FIGURE 5
  • FIGURE 7 is a partial plan view showing a spray device incorporating one modification of the present invention
  • FIGURE 8 is a sectional view taken along line 8-8 of FIGURE 7;
  • FIGURE 9 is a partial sectional view taken along line 9-9 of FIGURE 7.
  • Dishwasher 10 includes an outer cabinet 11 defining therein a wash chamber 12. Disposed within wash chamber 12 are dish supporting racks 13 and 14 each of which supports plates, glasses, cups and the like during operation of dishwasher 10. An access opening is provided in the top of cabinet 11 to provide access to wash chamber 12. A closure member or door 15 is pivotally attached to cabinet 11 by means of hinge member 16 to provide access to wash chamber 12 so that dish supporting racks 13 and 14 may be loaded and unloaded.
  • wash chamber 12 The lower extremity of wash chamber 12 is defined by a bottom wall 17 which has a depressed central portion forming a sump 18. Positioned within sump 18 and supported by bottom wall 17 is a motor-pump assembly 19.
  • Motor-pump assembly 19 includes an electric motor 20 and a pump 21.
  • Motor 20 is preferably of the electrically-reversible type well known in the electric motor art.
  • Pump 21 may be mechanically directly linked to motor 20 so that as the direction of rotation of motor 20 is reversed, the direction of rotation of pump 21 is also reversed. In one direction of rotation of motor 20, pump 21 withdraws wash fluids from sump 18 through an inlet 22 and propels the fluids upwardly through a rotatable reaction-type spray arm 23.
  • the wash fluids issuing from spray arm 23 effectuate a wash action upon the dishes supported by racks 13 and 14 in wash chamber 12.
  • pump 21 withdraws wash fluids from sump 18 through inlet 22 and propels these fluids out through an eflluent discharge conduit 24 which communicates with the normal household sewer system (not shown).
  • An electrical resistance heating element 25 may be provided to facilitate drying of the dishes supported by racks 13 and 14 upon completion of the wash operation or, additionally, to heat the wash fluids during the wash operation.
  • spray arm 23 is illustrated as including a plurality of open ings 26 longitudinally spaced along the spray arm 23 and communicating with a fluid passageway 23a (FIGURE 3) within the spray arm. Openings 26 are substantially ci-rcular in configuration when viewed from the top, as in FIGURE 2, and are of sufficient diameter to allow food particles of the size of a kernel of corn or a green pea to pass therethrough. Near each end of spray arm 23 is an additional opening 27.
  • Each of the openings 27 is directed laterally of spray arm 23 and, because of this, when wash fluids are introduced into spray arm 23 under pressure, the jets issuing from openings 27 cause a reaction force which rotates spray arm 23. With the openings oriented as shown in FIGURE 2, spray arm 23 will rotate clockwise, as viewed from the top, as the wash fluid issues from openings 27.
  • FIGURE 3 which shows a sectional view of spray arm 23 as taken along line 33 of FIGURE 2, illustrates that openings 26 are positioned in the apex of a dihedral angle formed on the inner surface of upper wall of spray arm 23.
  • the size of the dihedral angle is represented in FIG- URE 3 as A.
  • the relationship between opening 26 and the dihedral angle creates the sheet-like spray which issues from opening 26 when wash fluid is introduced into spray arm 23 under pressure.
  • FIGURE 4 provides an enlarged view of opening 26 and the associated dihedral angle
  • the dihedral angle includes members 28 and 29 which come together at an apex 30.
  • FIGURE 4 an approximation of the configuration of the wash fluids issuing from opening 26 is also given. It can be seen from FIGURE 4 that the stream of fluid is considerably smaller, in the plane of FIGURE 4, than the opening 26. This accentuated vena contracta is a result of the dihedral angle formed by members 28 and 29.
  • the fluid issuing from opening 26 attempts to follow a path normal to each plane of the dihedral angle. This causes an interference between fluid issuing from opposite sides of the orifice and the interference results in a fanning out or diverging of the fluid in a plane parallel to the apex of the dihedral angle. Therefore, the dihedral angle, with the opening formed at its apex, creates a sheet-like jet of water generally aligned with the apex of the dihedral angle.
  • the size A of the dihedral angle may vary from just less than 180 down to about 45. With a circular opening, the configuration of the spray will vary from almost circular at or near 180 angle to an increasingly accentuated sheet-like spray as the angle size decreases.
  • FIGURES and 6 illustrate a modification particularly suitable for use with a spray arm having a wall of substantial thickness. If the spray arm wall is of substantial thickness, there is a possibility that the diverging edges of the fluid stream may meet interference from the outer edges of the opening. Accordingly, it may be desirable to chamfer the edges of opening 26 in the areas where the spray diverges. In FIGURE 6, chamfered areas 31 and 32 are provided to avoid interference between the outer surface of the wall of spray arm 23 with the diverging fluid. If desired, opening 26 may be formed as a truncated cone.
  • FIGURES 7, 8 and 9 there is illustrated a spray arm 35 having therein a plurality of openings 36 communicating with a fluid passageway 35a within the spray arm. Openings 36 are similar in size and function to openings 26 as discussed above with regard to spray arm 23. However, spray arm 35 has a cross section-a1 area which is much smaller than the cross sec tional area of spray arm 23. Accordingly, a significant velocity will be established within spray arm 35 when suflicient wash fluid is propelled therethrough to feed all of the openings 36. This velocity can affect the configuration of the spray issuing from each of the openings 36. That is, as the wash fluid passes through an opening 36, in addition to having velocity components normal to the opening, it will have a velocity component parallel to, and in the same direction as, the velocity of the fluid within the spray arm 35.
  • the apex 37 of the dihedral angle is inclined with respect to the longitudinal axis of the spray arm 35. Since the fluid passing through an orifice such as opening 36 has a tendency to issue therefrom in a path normal to the surface adjacent the orifice, the fluid thus passing through orifice 36 is inherently provided with a velocity component which overcomes the velocity component present within spray arm 35.
  • the present invention provides a spray device for an automatic dishwasher which achieves a diverging or sheet-like spray to effectuate the wash action in the dishwasher wash chamber. Because the spray issuing from the individual orifices in the spray device is sheet-like, it is therefore possible to space the individual orifices farther part from each other while at the same time achieving substantially the same effective water distribution within the wash chamber. Since a smaller number of orifices is needed, less wash fluid is necessary and, additionally, a less powerful motor-pump assembly may be employed since less fluid needs to be recirculated.
  • a circular orifice in combination with a dihedral angle to achieve the sheet-like spray.
  • the circular opening allows relatively large food particles, i.e., the size of a kernel of corn or a green pea, to pass through the orifice while the dihedral angle achieves a vena contracta which effectively reduces the orifice size with respect to the amount of fluid which passes therethrough.
  • a spray arm to effectuate a fan-like spray directed toward said articles comprising:
  • said vena contracta having a cross-sectional area smaller than the cross-sectional area of said opening whereby said opening is free to pass a solid particle of larger size than the cross-sectional area of said vena contracta.
  • a spray device to effectuate a fan-like spray directed toward said articles comprising:
  • said vena contracta having a cross-sectional area smaller than the cross-sectional area of said opening whereby said opening is free to pass a solid particle of larger size than the cross-sectional area of said vena contracta.
  • a spray arm to effectuate a fan-like spray directed toward said articles comprising:
  • said exterior surface being chamfered about said opening so that the cross-sectional area of said opening is smallest where it intersects said interior surface and largest where it intersects said exterior surface.
  • a spray device to effectuate a fan-like spray directed toward said articles comprising:
  • a spray arm to effectuate a fan-like spray directed toward said articles comprising:
  • said vena contracta having a cross-sectional area smaller than the cross-sectional area of said opening whereby said opening is free to pass a solid particle of larger size than the cross-sectional area of said vena contracta.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Nozzles (AREA)
US392655A 1964-08-27 1964-08-27 Non-clogging dishwasher arm orifices forming a fan-like vena contracta spray pattern Expired - Lifetime US3288372A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US392655A US3288372A (en) 1964-08-27 1964-08-27 Non-clogging dishwasher arm orifices forming a fan-like vena contracta spray pattern
GB32621/65A GB1077155A (en) 1964-08-27 1965-07-30 Improvements in dish washing spray devices
FR28028A FR1442945A (fr) 1964-08-27 1965-08-11 Dispositif de pulvérisation de liquide pour machine automatique à laver la vaisselle
CH1187665A CH451425A (de) 1964-08-27 1965-08-24 Geschirrwaschmaschine
DEG32919U DE1926826U (de) 1964-08-27 1965-08-25 Spruehvorrichtung fuer automatische geschirrspuelmaschinen.
DE19651503792 DE1503792A1 (de) 1964-08-27 1965-08-25 Spruehvorrichtung fuer automatische Geschirrspuelmaschinen
DK440265AA DK116960B (da) 1964-08-27 1965-08-27 Sprøjtemekanisme til en automatisk opvaskemaskine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US392655A US3288372A (en) 1964-08-27 1964-08-27 Non-clogging dishwasher arm orifices forming a fan-like vena contracta spray pattern

Publications (1)

Publication Number Publication Date
US3288372A true US3288372A (en) 1966-11-29

Family

ID=23551484

Family Applications (1)

Application Number Title Priority Date Filing Date
US392655A Expired - Lifetime US3288372A (en) 1964-08-27 1964-08-27 Non-clogging dishwasher arm orifices forming a fan-like vena contracta spray pattern

Country Status (5)

Country Link
US (1) US3288372A (de)
CH (1) CH451425A (de)
DE (2) DE1926826U (de)
DK (1) DK116960B (de)
GB (1) GB1077155A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418868A (en) * 1981-05-29 1983-12-06 Whirlpool Corporation Dishwasher upper spray arm
US5267582A (en) * 1992-01-21 1993-12-07 Maytag Corporation Wash arm construction
US20080276975A1 (en) * 2004-06-22 2008-11-13 Premark Feg L.L.C. Spray Nozzle For a Dishwasher
EP2789285A1 (de) * 2013-04-08 2014-10-15 BSH Bosch und Siemens Hausgeräte GmbH Sprühdüse für eine Geschirrspülmaschine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4582259A (en) * 1984-09-12 1986-04-15 Hobart Corporation Wash arm and method and apparatus for forming the same
GB2327338A (en) * 1997-07-16 1999-01-27 Brendon Limited Water driven rotor
DE19931875A1 (de) * 1999-07-09 2001-01-11 Winterhalter Gastronom Gmbh Reinigungssystem
DE102012016398B4 (de) * 2012-08-21 2014-06-05 BSH Bosch und Siemens Hausgeräte GmbH Düseneinrichtung für einen Sprüharm einer Geschirrspülmaschine

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388930A (en) * 1888-09-04 Sprinkling or spraying pfpe
US899261A (en) * 1908-03-12 1908-09-22 Charles H Prescott Boiler-cleaner.
US1180807A (en) * 1915-11-27 1916-04-25 John Warren Vedder Shower-pipe for paper-making machines.
US1677485A (en) * 1924-06-09 1928-07-17 Lewen R Nelson Sprinkler
US1787024A (en) * 1927-07-20 1930-12-30 Sjostrom Bertha Manually-operated irrigator
US2302021A (en) * 1941-11-06 1942-11-17 Rockwood Sprinkler Co Nozzle for generating fog
US2642314A (en) * 1951-04-14 1953-06-16 Crown Zellerbach Corp Dripless steam shower pipe
US2665946A (en) * 1951-05-29 1954-01-12 Arthur E Broughton Spray nozzle
US2794680A (en) * 1954-11-18 1957-06-04 Gordon C Bennett Lawn sprinkler with tiltable support
US2834635A (en) * 1955-06-22 1958-05-13 Muellermist Irrigation Co Liquid spray device
US2905393A (en) * 1958-03-14 1959-09-22 George J Federighi Rotary spray arm for a cleaning machine
US3107060A (en) * 1962-04-26 1963-10-15 Jr Claude Coursey Fog tip
US3180348A (en) * 1962-12-21 1965-04-27 Whirlpool Co Article washing apparatus
US3184166A (en) * 1963-03-11 1965-05-18 Whirlpool Co Dishwasher

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388930A (en) * 1888-09-04 Sprinkling or spraying pfpe
US899261A (en) * 1908-03-12 1908-09-22 Charles H Prescott Boiler-cleaner.
US1180807A (en) * 1915-11-27 1916-04-25 John Warren Vedder Shower-pipe for paper-making machines.
US1677485A (en) * 1924-06-09 1928-07-17 Lewen R Nelson Sprinkler
US1787024A (en) * 1927-07-20 1930-12-30 Sjostrom Bertha Manually-operated irrigator
US2302021A (en) * 1941-11-06 1942-11-17 Rockwood Sprinkler Co Nozzle for generating fog
US2642314A (en) * 1951-04-14 1953-06-16 Crown Zellerbach Corp Dripless steam shower pipe
US2665946A (en) * 1951-05-29 1954-01-12 Arthur E Broughton Spray nozzle
US2794680A (en) * 1954-11-18 1957-06-04 Gordon C Bennett Lawn sprinkler with tiltable support
US2834635A (en) * 1955-06-22 1958-05-13 Muellermist Irrigation Co Liquid spray device
US2905393A (en) * 1958-03-14 1959-09-22 George J Federighi Rotary spray arm for a cleaning machine
US3107060A (en) * 1962-04-26 1963-10-15 Jr Claude Coursey Fog tip
US3180348A (en) * 1962-12-21 1965-04-27 Whirlpool Co Article washing apparatus
US3184166A (en) * 1963-03-11 1965-05-18 Whirlpool Co Dishwasher

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418868A (en) * 1981-05-29 1983-12-06 Whirlpool Corporation Dishwasher upper spray arm
US5267582A (en) * 1992-01-21 1993-12-07 Maytag Corporation Wash arm construction
US20080276975A1 (en) * 2004-06-22 2008-11-13 Premark Feg L.L.C. Spray Nozzle For a Dishwasher
EP2789285A1 (de) * 2013-04-08 2014-10-15 BSH Bosch und Siemens Hausgeräte GmbH Sprühdüse für eine Geschirrspülmaschine

Also Published As

Publication number Publication date
GB1077155A (en) 1967-07-26
DE1503792A1 (de) 1969-05-22
CH451425A (de) 1968-05-15
DE1926826U (de) 1965-11-11
DK116960B (da) 1970-03-02

Similar Documents

Publication Publication Date Title
US7931754B2 (en) Dishwasher with mist cleaning
US7673639B2 (en) Washing arm and dishwasher having the same
EP1847207B1 (de) Wasch- und Spülsystem für einen schubladenartigen Geschirrspüler
US8287660B2 (en) Upper spray arm water deflector
US3496949A (en) Dishwasher with multiple spray arm
US7523758B2 (en) Dishwasher having rotating zone wash sprayer
US5964232A (en) Spraying nozzle assembly for a dishwasher
US10413152B2 (en) Spray assemblies for dishwasher appliances
US10058226B2 (en) Dishwasher comprising at least one dishwasher spray arm
KR0122507Y1 (ko) 식기세척기의 세척수분사장치
US3288372A (en) Non-clogging dishwasher arm orifices forming a fan-like vena contracta spray pattern
US20120325277A1 (en) Dishwasher spray arm assembly
CN106137075B (zh) 一种洗碗机顶喷淋组件及洗碗机
US11464390B2 (en) Fan-shaped spray detergent nozzle
US2664903A (en) Dishwasher
EP3784107B1 (de) Haushalts-geschirrspülmaschine mit sprüheinrichtung
US11464391B2 (en) Spray arm assembly
CN109965804B (zh) 一种清洗机
US20050066998A1 (en) Dishwasher with kinetic energy water distribution system
US11389043B2 (en) Dishwasher spray arm assembly
US11849899B2 (en) Domestic dishwasher
EP4364633A1 (de) Geschirrspülmaschine mit verbesserter waschwirksamkeit
KR0176959B1 (ko) 식기세척기의 분사아암 노즐구조
CN109394112B (zh) 一种清洗机
CN208573626U (zh) 一种喷淋臂及应用有该喷淋臂的清洗机