High performance washing process for vertical axis automatic washer

• US 4,987,627 A
• Filed: 01/05/1990
• Issued: 01/29/1991
• Est. Priority Date: 01/05/1990
• Status: Expired due to Term

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Corporation
• Inventors: Pastryk, Jim J., Hardaway, Anthony H., Cur, Nihat O., Euler, John W.
• Primary Examiner(s): Coe, Philip R.
• Application Number:
  US07/461,404
• Time in Patent Office: 389 Days
• Field of Search: 8/158, 8/159, 68/12 R, 68/13 R, 68/17 R, 68/18 D, 68/23.5, 68/53, 68/148, 68/174, 68/184, 68/208
• US Class Current: 8/158
• CPC Class Codes: D06F 33/37 of metering of detergents or additives
• CPC Class Codes: D06F 35/006 for washing or rinsing only
• CPC Class Codes: D06F 39/02 Devices for adding soap or other washing agents
• CPC Class Codes: D06F 39/081 Safety arrangements for preventing water damage

Abstract

A method for laundering a textile wash load is provided for use in a vertical axis washing machine in which a concentrated detergent solution is continuously applied to a spinning wash load for a predetermined time period to thoroughly wet the clothes load. The initial charge of detergent is thoroughly mixed with the detergent in a recirculation step before being applied to the clothes load. The concentration wash liquid is incrementally applied to the spinning clothes load until a sufficient amount of wash liquid is detected as having been introduced to the wash zone. That amount of wash liquid is then recirculated and reapplied to the clothes load for a predetermined length of time. After the time period, additional water is added to the solution to dilute it to a normal concentration and then mechanical agitation and rinsing steps are conducted to complete the wash cycle.

Claims

1. A method of laundering a textile wash load in a washing apparatus having a wash tub for receiving a wash liquid within which there is a rotatable wash zone including a peripheral wall, a collection zone for said wash liquid, a pump for moving said wash liquid, means for rotating said peripheral wall and said wash load in said wash zone about a generally vertical axis, comprising the sequential steps of:

(1) introducing said textile wash load into said wash zone;

(2) rotating said wash load and said peripheral wall at a speed that is sufficient to maintain the load against the peripheral wall;

(3) introducing incremental amounts of wash liquid to said rotating wash load from a source external of said wash tub and monitoring the collection zone for the presence of wash liquid;

(4) terminating the introduction of additional amounts of wash liquid into the wash zone from said source once a sufficient amount of wash liquid has been detected in the collection zone by said monitoring;

(5) continuously passing said wash liquid from said collection zone through said rotating wash load so that the cumulative amount passed through is greater than the amount necessary to saturate the clothes load;

(6) terminating steps b 2 and 5 after a first predetermined time period following the start of step 5; and

(7) rinsing said wash liquid from said wash load.

2. A method of laundering a wash load according to claim 1, further comprising prior to step 3 the steps of:

introducing a charge of detergent into a detergent dispenser;

introducing water into said detergent dispenser to flush said detergent into said collection zone in said wash tub;

pumping said detergent and water from said collection zone to a mixing zone; and

recirculating said detergent and water from said mixing zone through said pump and back to said mixing zone to effect a thorough mixing of said detergent and water into a wash liquid.

3. A method of laundering a wash load according to claim 2, wherein the introduction of water to flush said detergent into said wash zone is in an amount to provide a wash liquid being a concentrated detergent solution in the range of not less than approximately 0.5% to 4% detergent concentration.

4. A method of laundering a wash load according to claim 1, wherein said continuous passing of wash liquid through the rotating wash load in step 5 is done in the absence of mechanical agitation of the wash load during at least a portion of the time said load is being rotated.

5. A method of laundering a wash load according to claim 1, further comprising after step 6 and prior to step 7, the additional steps of:

introducing water to said wash zone to dilute the wash liquid;

agitating the load in the dilute wash liquid for a second predetermined period.

6. A method of laundering a wash load according to claim 1, wherein step 7 further comprises the sequential steps of:

(a) draining wash liquid from said wash zone following a washing portion of a wash cycle;

(b) spinning said wash load and said peripheral wall at a speed that is sufficient to maintain the load against the peripheral wall;

(c) introducing an incremental amount of water into said wash zone such that it fully contacts said spinning wash load;

(d) discharging water released from said spinning wash load directly to drain;

(e) repeating steps c and d at least one time;

(f) introducing an incremental amount of water into said wash zone such that it fully contacts said spinning wash load;

(g) continuously passing said water through said spinning wash load so that the cumulative amount passed through is greater than the amount necessary to saturate the clothes load;

(h) discharging water released from said spinning wash load directly to drain after a first predetermined time period;

(i) repeating steps f, g and h a plurality of times.

7. A method of laundering a wash load according to claim 6, wherein steps c and d are repeated only one time.

8. A method of laundering a wash load according to claim 6, wherein steps f, g and h are repeated in the range of 4 to 12 times.

9. A method of laundering a wash load according to claim 6, wherein said wash load and peripheral wall are rotated at a speed sufficient to cause a large portion of the water applied to the wash load to be extracted therefrom due to centrifugal forces.

10. A method of laundering a textile wash load in a washing apparatus having a wash tub for receiving a wash liquid within which there is a rotatable wash zone including a peripheral wall, a collection zone for said wash liquid, a mixing zone for mixing and storing said wash liquid, a pump for moving said wash liquid, means for rotating said peripheral wall and said wash load in said wash zone about a generally vertical axis, and a detergent dispenser for receiving a charge of detergent to be dispensed into said washing apparatus comprising the sequential steps of:

(1) introducing said textile wash load into said wash zone and introducing a charge of detergent into said detergent dispenser;

(2) rotating said wash load and said peripheral wall at a speed that is sufficient to maintain the load against the peripheral wall;

(3) introducing water into said detergent dispenser to flush said detergent into said collection zone in said wash tub;

(4) pumping said detergent and water from said collection zone to said mixing zone;

(5) recirculating said detergent and water from said mixing zone through said pump and back to said mixing zone to effect a thorough mixing of said detergent and water into a wash liquid;

(6) continuously passing said wash liquid through said rotating wash load so that the total effective amount passed through is greater than the amount necessary to saturate the clothes load;

(7) terminating steps 2 and 6 after a first predetermined time period following the start of step 6;

(8) rinsing said wash liquid from said wash load.

11. A method of laundering a wash load according to claim 10, wherein the introduction of water in step 3 is in an amount to provide a wash liquid being a concentrated detergent solution in the range of not less than approximately 0.5% to 4% detergent concentration.

12. A method of laundering a wash load according to claim 10, wherein said continuous passing of wash liquid through the rotating wash load in step 6 is done in the absence of mechanical agitation of the wash load during at least a portion of the time said load is being rotated.

13. A method of laundering a wash load according to claim 10, further comprising after step 6 and prior to step 7, the additional steps of:

introducing water to said wash zone to dilute the wash liquid; and

agitating the load in the dilute wash liquid for a second predetermined period.

14. A method of laundering a wash load according to claim 10, wherein step 7 further comprises:

(a) draining wash liquid from said wash zone following a washing portion of a wash cycle;

(b) spinning said wash load and said peripheral wall at a speed that is sufficient to maintain the load against the peripheral wall;

(c) introducing an incremental amount of water into said wash zone such that it fully contacts said spinning wash load;

(d) discharging water released from said spinning wash load directly to drain;

(e) repeating steps c and d at least one time;

(f) introducing an incremental amount of water into said wash zone such that it fully contacts said spinning wash load;

(g) continuously passing said water through said spinning wash load so that the cumulative amount passed through is greater than the amount necessary to saturate the clothes load;

(h) discharging water released from said spinning wash load directly to drain after a first predetermined time period; and

(i) repeating steps f, g and h a plurality of times.

15. A method of laundering a textile wash load in a washing apparatus according to claim 10, wherein step 6 further comprises the steps of:

introducing incremental amounts of wash liquid to said rotating wash load from a source external of said wash tub and monitoring the collection zone for the presence of wash liquid;

terminating the introduction of additional amounts of wash liquid into the wash zone from said source once a sufficient amount of wash liquid has been detected in the collection zone by said monitoring; and

recirculating said wash liquid from said collection zone through said rotating wash load a plurality of times to substantially permeate said wash load.

16. A method of laundering a textile wash load in a washing apparatus having a wash tub for receiving a wash liquid within which there is a rotatable wash zone including a peripheral wall, a collection zone for said wash liquid, a mixing zone for mixing and storing said wash liquid, a pump for moving said wash liquid, means for rotating said peripheral wall and said wash load in said wash zone about a generally vertical axis, a detergent dispenser for receiving a charge of detergent to be dispensed into said washing apparatus and means for providing mechanical agitation of said wash load within said wash zone, comprising the sequential steps of:

(1) introducing said textile wash load into said wash zone and introducing a charge of detergent into said detergent dispenser;

(2) rotating said wash load and said peripheral wall at a speed that is sufficient to maintain the load against the peripheral wall;

(3) introducing water into said detergent dispenser to flush said detergent into said collection zone in said wash tub;

(4) pumping said detergent and water from said collection zone to said mixing zone;

(5) recirculating said detergent and water from said mixing zone through said pump and back to said mixing zone to effect a through mixing of said detergent and water into a wash liquid;

(6) recirculating said wash liquid through said rotating wash load a plurality of times to substantially permeate said wash load;

(7) terminating steps 2 and 6 after a first predetermined time period following the start of step b 6; and

(8) rinsing said wash liquid from said wash load.

17. A method of laundering a wash load according to claim 16, wherein the introduction of water in step 3 is in an amount to provide a wash liquid being a concentrated detergent solution in the range of not less than approximately 0.5% to 4% detergent concentration.

18. A method of laundering a wash load according to claim 16, wherein said recirculating of wash liquid through the rotating wash load in step 6 is done in the absence of mechanical agitation of the wash load during at least a portion of the time said load is being rotated.

19. A method of laundering a wash load according to claim 16, further comprising after step 6 and prior to step 7, the additional steps of:

introducing water to said wash zone to dilute the wash liquid;

agitating the load in the dilute wash liquid for a second predetermined period.

20. A method of laundering a textile wash load in a washing apparatus having a wash tub for receiving a wash liquid within which there is a rotatable wash zone including a peripheral wall, a collection zone for said wash liquid, means for rotating said peripheral wall and said wash load in said wash zone about a generally vertical axis, and means for providing mechanical agitation of said wash load within said wash zone, comprising the sequential steps of:

(1) introducing said textile wash load into said wash zone;

(2) rotating said wash load and said peripheral wall at a speed that is sufficient to maintain the load against the peripheral wall;

(3) introducing incremental amounts of wash liquid to said rotating wash load from a source external of said wash tub and monitoring the collection zone for the presence of wash liquid;

(4) terminating the introduction of additional amounts of wash liquid into the wash zone from said source once a sufficient amount of wash liquid has been detected in the collection zone by said monitoring;

(5) recirculating said wash liquid from said collection zone through said spinning wash load a plurality of times to substantially permeate said wash load;

(6) terminating steps 2 and 5 after a first predetermined time period following the start of step 5; and

(7) rinsing said wash liquid from said wash load.

21. A method of laundering a wash load according to claim 20, wherein the wash liquid introduced in step 3 is a concentrated detergent solution in the range of not less than approximately 0.5% to 4% detergent concentration.

22. A method of laundering a wash load according to claim 20, wherein said recirculating of wash liquid through the rotating wash load in step 5 is done in the absence of mechanical agitation of the wash load during at least a portion of the time said load is being rotated.

23. A method of laundering a wash load according to claim 20, further comprising after step 6 and prior to step 7, the additional steps of:

introducing water to said wash zone to dilute the wash liquid;

agitating the load in the dilute wash liquid for a second predetermined period.

24. An apparatus for laundering a textile wash load comprising:

a wash tub for receiving a wash liquid within which there is a rotatable wash zone including a peripheral wall,

a collection zone for said wash liquid,

a pump for moving said wash liquid,

means for rotating said peripheral wall and said wash load in said wash zone about a generally vertical axis,

means for rotating said wash load and said peripheral wall at a speed that is sufficient to maintain the load against the peripheral wall;

means for introducing incremental amounts of wash liquid to said rotating wash load from a source exterior of said wash tub and monitoring the collection zone for the presence of wash liquid;

means for terminating the introduction of additional amounts of wash liquid into the wash zone from said source once a sufficient amount of wash liquid has been detected in the collection zone by said monitoring;

means for continuously passing said wash liquid from said collection zone through said spinning wash load so that the cumulative amount passed through is greater than the amount necessary to saturate the clothes load; and

means for rinsing said wash liquid from said wash load.

25. An apparatus for laundering a textile wash load according to claim 24, further comprising:

a detergent dispenser;

means for introducing water into said detergent dispenser to flush said detergent into said collection zone in said wash tub;

means for pumping said detergent and water from said collection zone to a mixing zone for mixing and storing said wash liquid; and

means for recirculating said detergent and water from said mixing zone through said pump and back to said mixing zone to effect a thorough mixing of said detergent and water into a wash liquid.

26. An apparatus for laundering a textile wash load according to claim 24, including means for continuously passing wash liquid through the rotating wash load in the absence of mechanical agitation of the wash load during at least a portion of the time said load is being rotated.

27. An apparatus for laundering a textile wash load according to claim 24, further comprising:

means for introducing water to said wash zone to dilute the wash liquid; and

means for agitating the load in the dilute wash liquid for a second predetermined period.

28. An apparatus for laundering a textile wash load according to claim 24, further comprising:

means for draining wash liquid from said wash zone following a washing portion of a wash cycle;

means for spinning said wash load and said peripheral wall at a speed that is sufficient to maintain the load against the peripheral wall;

means for introducing an incremental amount of water into said wash zone such that it fully contacts said spinning wash load;

means for discharging water released from said spinning wash load directly to drain;

means for introducing an incremental amount of water into said wash zone such that it fully contacts said spinning wash load;

means for continuously passing said water through said spinning wash load so that the total effective amount passed through is greater than the amount necessary to saturate the clothes load; and

means for discharging water released from said spinning wash load directly to drain after a first predetermined time period.

29. An apparatus for laundering a textile wash load according to claim 28, including means for rotating said wash load and peripheral wall at a speed sufficient to cause a large portion of the water applied to the wash load to be extracted therefrom due to centrifugal forces.