US2850917A - Means for balancing an unevenly loaded rotary container - Google Patents

Means for balancing an unevenly loaded rotary container Download PDF

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Publication number
US2850917A
US2850917A US326741A US32674152A US2850917A US 2850917 A US2850917 A US 2850917A US 326741 A US326741 A US 326741A US 32674152 A US32674152 A US 32674152A US 2850917 A US2850917 A US 2850917A
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Prior art keywords
container
balancing
compartments
rotary container
vessel
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US326741A
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Soderstrom Lars-Johan
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/32—Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels
    • F16F15/36—Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels operating automatically, i.e. where, for a given amount of unbalance, there is movement of masses until balance is achieved
    • F16F15/366—Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels operating automatically, i.e. where, for a given amount of unbalance, there is movement of masses until balance is achieved using fluid or powder means, i.e. non-discrete material
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/24—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a vertical axis
    • D06F37/245—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2109—Balancing for drum, e.g., washing machine or arm-type structure, etc., centrifuge, etc.

Definitions

  • the present invention relates to a means for balancing a rotary mass, the centre of gravity of which does not coincide with its centre of rotation.
  • the invention is intended for balancing a rotatable container carried by a vertical, radially resilient axle, by way of example a container in a centrifuge for removing moisture from laundry and the like, and its main feature is that the radial change of position of the container caused during the rotation by the lack of balance is utilized for filling liquid into one or more balancing chambers provided in the container.
  • Fig. 1 is a vertical section on a line represented by II in Fig. 2, and
  • Fig. 2 is a top view of a detail of the apparatus with certain parts omitted.
  • the numeral 1 designates a container, which is carried by a vertical or substantially vertical axle 2.
  • the container is open at the top.
  • the lower end of the axle 2 is fitted into a bushing 3 of some suitable material, which is surrounded by a resilient material, for instance rubber, shaped as a bushing 4.
  • the radially resilient bearing of the axle 2 formed by the bushings 3 and 4 is mounted in a third bushing 6, which is fitted in the frame 5 of the centrifuge.
  • the central portion of the container bottom 7 has an upwardly extending bushing-like part 8, in which the upper end of the axle 2 is mounted, either rigidly, or resiliently by means of a surrounding sleeve 9 of resilient material.
  • the axle top portion may also be connected with the container 1 by means of a downwards pointing, sleeveshaped part, which is arranged centrally to the container bottom 7 and is secured to a plate of suitable material fastened to said bottom 7.
  • the upper portion of the container 1 is provided with a collar forming an approximately radially or obliquely inwardly directed wall 10 and an upright flange 11 integral therewith.
  • An annular vessel 12 opening up towards its centre is secured to the outside of said flange 11.
  • Fig. 2 is a top view of this vessel.
  • the bottom portion of the vessel 12 is somewhat spaced from the top wall 10 of the container 1, an annular space 13 thus being formed between the wall 10 and the vessel 12.
  • the latter is divided up into a plurality of compartments 15 by partitions 14, and said compartments are provided with drain holes 16.
  • the diameter of the circular opening in the upper plane side of the vessel 12 is larger than the diameter of the flange 11 on the container 1, the partitions 14 being provided with angular recesses, which are limited by top edge of the flange 11 and the inwards pointing edge portion of the vessel 12.
  • annular pipe 17 which has a plurality of nozzles 18 pointing downwards. Water can be fed to said pipe 17 through a pipe 19.
  • the nozzles 18 are so placed in the pipe 17 that the water jets 20 from the same will pass near the inner side of the flange 11 when the container 1 is at rest, or rotates unloaded or evenly loaded.
  • the centre of gravity of the goods placed in the container 1 does not coincide with the centre of rotation of the container, the latter will be influenced when rotating by a force directed radially to the uneven load, the axle 2, which is mounted in a resilient bearing, will assume a position deviating from the vertical line towards the uneven load in the container 1.
  • the container during the rotation has reached such an inclination towards the uneven load 21 that that part of the flange 11. which diametrically opposes the uneven load comes inside the water jets 20 from the nozzles 18, water is filled into one or more of the compartments 15 in the annular vessel 12. This water, which is retained in the respective compartments "by the centrifugal force, will completely equalize the uneven load, and in consequence the speed of the container can be increased above the critical number of revolutions without risk of dangerous vibrations arising.
  • an equalizing vessel underneath the container bottom, said vessel resembling that mounted to the upper portion of the container in constructional as well as in functional respect.
  • an uneven loading may be equalized by means of equalizing vessels, the compartments of which have been prefilled to the same level. Water is then brought to run out of the compartments on the more heavily loaded side through valves which, due to the change of position during the rotation, abut against a rigid stop and open. The Water in the compartments on the opposite side of the vessel will now equalize the uneven load.
  • This arrangement makes it possible to balance also a container rotating abouta horizontal axle, provided that the balancing vessels are completely closed and equipped with valves.
  • Means for balancing an unevenly loaded rotary container carried by a vertically disposed axle, mounted resiliently in the radial direction, comprising means forming compartments around the top of the container, said compartments being bordered by open free rims on the part nearest to the center of rotation, a plurality of nozzles attached to a fixed feed pipe,'said nozzles being arranged at a short distance from and against said rim, so that liquid jets discharging'from the nozzles pass near said rim, at a shorter distance to the center of rotation than the distance from the rim to the center of rotation, said free rims of the compartments being located diametrically opposite to the heavier load in the container thus passing under the liquid jets when the centrifugal force on the load moves the whole in the radial direction, said liquid jets supplying the compartments with liquid, until the container during increasing rotation rotates round its true center and thus the heavier load is counterbalanced.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Centrifugal Separators (AREA)

Description

p 1958 LARS-JOHAN SODERSTRGM 2,850,917
- MEANS FOR BALANCING AN UNEVENLY LOADED ROTARY CONTAINER Filed Dec. 18,1952
lllllllllll INVENTOR United fltates Patent MEANS FOR BALANCING AN UNEVENLY LOADED ROTARY CONTAINER Lars-Johan Stiderstrtim, Eskilstuna, Sweden Application December 18, 1952, Serial No. 326,741
2 Claims. (Cl. 74573) The present invention relates to a means for balancing a rotary mass, the centre of gravity of which does not coincide with its centre of rotation. The invention is intended for balancing a rotatable container carried by a vertical, radially resilient axle, by way of example a container in a centrifuge for removing moisture from laundry and the like, and its main feature is that the radial change of position of the container caused during the rotation by the lack of balance is utilized for filling liquid into one or more balancing chambers provided in the container.
A centrifuge for drying laundry and the like, and having its rotary container balanced in accordance with the above means, is described in the following text and illustrated in the accompanying drawing, in which Fig. 1 is a vertical section on a line represented by II in Fig. 2, and
Fig. 2 is a top view of a detail of the apparatus with certain parts omitted.
In the drawing, the numeral 1 designates a container, which is carried by a vertical or substantially vertical axle 2. The container is open at the top. The lower end of the axle 2 is fitted into a bushing 3 of some suitable material, which is surrounded by a resilient material, for instance rubber, shaped as a bushing 4. The radially resilient bearing of the axle 2 formed by the bushings 3 and 4 is mounted in a third bushing 6, which is fitted in the frame 5 of the centrifuge. The central portion of the container bottom 7 has an upwardly extending bushing-like part 8, in which the upper end of the axle 2 is mounted, either rigidly, or resiliently by means of a surrounding sleeve 9 of resilient material. The axle top portion may also be connected with the container 1 by means of a downwards pointing, sleeveshaped part, which is arranged centrally to the container bottom 7 and is secured to a plate of suitable material fastened to said bottom 7.
The upper portion of the container 1 is provided with a collar forming an approximately radially or obliquely inwardly directed wall 10 and an upright flange 11 integral therewith. An annular vessel 12 opening up towards its centre is secured to the outside of said flange 11. Fig. 2 is a top view of this vessel. The bottom portion of the vessel 12 is somewhat spaced from the top wall 10 of the container 1, an annular space 13 thus being formed between the wall 10 and the vessel 12. The latter is divided up into a plurality of compartments 15 by partitions 14, and said compartments are provided with drain holes 16. The diameter of the circular opening in the upper plane side of the vessel 12 is larger than the diameter of the flange 11 on the container 1, the partitions 14 being provided with angular recesses, which are limited by top edge of the flange 11 and the inwards pointing edge portion of the vessel 12. At a certain distance above the flange 11 there is fitted an annular pipe 17, which has a plurality of nozzles 18 pointing downwards. Water can be fed to said pipe 17 through a pipe 19. The nozzles 18 are so placed in the pipe 17 that the water jets 20 from the same will pass near the inner side of the flange 11 when the container 1 is at rest, or rotates unloaded or evenly loaded.
If due to uneven loading (as shown at 21) the centre of gravity of the goods placed in the container 1 does not coincide with the centre of rotation of the container, the latter will be influenced when rotating by a force directed radially to the uneven load, the axle 2, which is mounted in a resilient bearing, will assume a position deviating from the vertical line towards the uneven load in the container 1. When the container during the rotation has reached such an inclination towards the uneven load 21 that that part of the flange 11. which diametrically opposes the uneven load comes inside the water jets 20 from the nozzles 18, water is filled into one or more of the compartments 15 in the annular vessel 12. This water, which is retained in the respective compartments "by the centrifugal force, will completely equalize the uneven load, and in consequence the speed of the container can be increased above the critical number of revolutions without risk of dangerous vibrations arising.
To effect a dynamical equalizing of an-uneven loading of the container 1, there is also provided an equalizing vessel underneath the container bottom, said vessel resembling that mounted to the upper portion of the container in constructional as well as in functional respect.
Obviously, the invention is not confined to the embodiment described in the foregoing text and illustrated, but may be varied in several ways without abandoning the inventional spirit. Thus an uneven loading may be equalized by means of equalizing vessels, the compartments of which have been prefilled to the same level. Water is then brought to run out of the compartments on the more heavily loaded side through valves which, due to the change of position during the rotation, abut against a rigid stop and open. The Water in the compartments on the opposite side of the vessel will now equalize the uneven load. This arrangement makes it possible to balance also a container rotating abouta horizontal axle, provided that the balancing vessels are completely closed and equipped with valves.
I claim: 1
1. Means for balancing an unevenly loaded rotary container carried by a vertically disposed axle, mounted resiliently in the radial direction, comprising means forming compartments around the top of the container, said compartments being bordered by open free rims on the part nearest to the center of rotation, a plurality of nozzles attached to a fixed feed pipe,'said nozzles being arranged at a short distance from and against said rim, so that liquid jets discharging'from the nozzles pass near said rim, at a shorter distance to the center of rotation than the distance from the rim to the center of rotation, said free rims of the compartments being located diametrically opposite to the heavier load in the container thus passing under the liquid jets when the centrifugal force on the load moves the whole in the radial direction, said liquid jets supplying the compartments with liquid, until the container during increasing rotation rotates round its true center and thus the heavier load is counterbalanced.-
2. Means as in claim 1 in which the container is resiliently attached to the axleand is provided with a plurality of compartments at the bottom, said compartments being similar to those at the top of the container, and a further similar arrangement of a plurality of nozzles arranged to bear upon the rims of said compartments.
References Cited in the file of this patent UNITED STATES PATENTS
US326741A 1952-12-18 1952-12-18 Means for balancing an unevenly loaded rotary container Expired - Lifetime US2850917A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1143059A2 (en) * 2000-03-11 2001-10-10 Lg Electronics Inc. Washing machine with balancer
US20180044836A1 (en) * 2015-03-03 2018-02-15 Lg Electronics Inc. Clothes treating apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US305026A (en) * 1884-09-09 edward stillman
US2525781A (en) * 1944-09-15 1950-10-17 J G De Remer Res Corp Balancing of rotatable bodies
US2538246A (en) * 1944-10-21 1951-01-16 Holm-Hansen Osmund Washing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US305026A (en) * 1884-09-09 edward stillman
US2525781A (en) * 1944-09-15 1950-10-17 J G De Remer Res Corp Balancing of rotatable bodies
US2538246A (en) * 1944-10-21 1951-01-16 Holm-Hansen Osmund Washing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1143059A2 (en) * 2000-03-11 2001-10-10 Lg Electronics Inc. Washing machine with balancer
EP1143059A3 (en) * 2000-03-11 2003-01-29 Lg Electronics Inc. Washing machine with balancer
US20180044836A1 (en) * 2015-03-03 2018-02-15 Lg Electronics Inc. Clothes treating apparatus

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