Commercial washing machine and method for supplying pre-wash water to a commercial washing machine

Abstract

To reduce time and energy necessary for heating washing water when shifting to main washing from prewashing while maintaining washability of blood stain, in a washing device for business use which recovers rinse water and dewatering drain water and uses it as prewashing water.SOLUTION: Washing is performed by setting the temperature of recovery water at equal to or higher than 50°C. Low temperature recovery water and high temperature recovery water are supplied sequentially, or a heater or a heat exchanger for heating the recovery water is provided, and a set prewashing temperature is achieved. The recovery water is made to pass through a hydrogen peroxide removal device once or a plurality of times, a hydrogen peroxide decomposition agent is supplied timely, and a detergent is mixed into the recovery water and it is supplied to a prewashing tub; thereby, hydrogen peroxide concentration is lowered.SELECTED DRAWING: Figure 3

Claims

[Claim 1] A commercial laundry facility comprising a continuous washing machine equipped with one or more pre-washing tubs, a main washing tub, a rinsing tub, and a processing tub, and a dehydrator for dewatering the clothes washed in the continuous washing machine, wherein hydrogen peroxide contained in the recovered cold water recovered from the processing tub or dehydrator and the recovered hot water recovered from the rinsing tub is removed or reduced and reused as pre-washing water for use in the pre-washing tub, A commercial washing machine comprising a controller including a pre-wash water temperature setting means for setting the temperature of the pre-wash water supplied to the pre-wash tank together with the items to be washed to 50°C or higher, a thermometer for measuring the temperature of the recovered hot water, and a thermometer for measuring the temperature of the recovered cold water, wherein the controller controls the amount of the recovered cold water and recovered hot water supplied to the pre-wash tank as pre-wash water based on the set value of the pre-wash water temperature. [Claim 2] The commercial washing apparatus according to claim 1, wherein the controller supplies the recovered cold water to the pre-wash tank as pre-wash water, and then supplies the recovered hot water to the pre-wash tank. [Claim 3] A commercial washing machine according to claim 1 or 2, further comprising a heat exchanger that heats the fresh water supplied to the rinse tank with wastewater from the main washing tank. [Claim 4] The commercial washing apparatus according to claim 1 or 2, further comprising a heater that heats the recovered water supplied to the pre-wash tank with wastewater from the main washing tank. [Claim 5] The commercial washing apparatus according to claim 4, wherein the heater is a heat exchanger that uses drainage from a continuous washing machine, including drainage from the washing tub, as a heat source. [Claim 6] A commercial laundry facility comprising a continuous washing machine equipped with one or more pre-washing tubs, a main washing tub, a rinsing tub, and a processing tub, and a dehydrator for dewatering the clothes washed in the continuous washing machine, wherein hydrogen peroxide contained in the recovered water recovered from the processing tub, dehydrator, or rinsing tub is removed or reduced and reused as pre-washing water for use in the pre-washing tub, A commercial laundry machine comprising a controller including a pre-wash water temperature setting means for setting the temperature of the pre-wash water supplied to the pre-wash tank together with the items to be washed to 50°C or higher, a thermometer for measuring the temperature of the recovered water, and a heater for heating the recovered water, wherein the controller controls the heating operation of the heater based on the set value of the pre-wash water temperature and the value detected by the thermometer. [Claim 7] The commercial washing apparatus according to claim 6, wherein the heater is a heat exchanger that uses drainage from a continuous washing machine, including drainage from the washing tub, as a heat source. [Claim 8] The commercial washing apparatus according to claim 6 or 7, further comprising a detergent supply device that supplies detergent to the pre-wash water flowing through a pre-wash water supply pipe that leads the recovered water to the pre-wash tank. [Claim 9] A commercial washing machine according to claim 1 or 6, further comprising a water softening device that removes metal ions from fresh water supplied to the rinse tank to reduce its hardness to 10 ppm or less. [Claim 10] In a washing and drying machine that sequentially performs a pre-washing process, a main washing process, a rinsing process, and a spin-drying process, A commercial washing and drying machine comprising: a recovery tank for storing wastewater discharged in the rinsing or dewatering process; a controller including a pre-wash water temperature setting means for setting the temperature of the pre-wash water used in the pre-washing process to 50°C or higher; a heater for heating the recovered water in the recovery tank; and a hydrogen peroxide removal device, wherein the controller heats the recovered water in the recovery tank based on the set value of the pre-wash water temperature, and uses the heated recovered water as pre-wash water when washing the next item to be washed. [Claim 11] The commercial washing and drying machine according to claim 10, wherein the heater is a heat exchanger that uses wastewater from the washing and drying machine, including the wastewater discharged in the washing process, as a heat source. [Claim 12] A commercial washing and dewatering machine according to claim 10 or 11, comprising a pump for circulating the recovered water in the recovery tank, and circulation piping equipped with the heater and hydrogen peroxide removal device, wherein the controller operates the pump at appropriate times to heat the recovered water. [Claim 13] Set the temperature of the pre-wash water used for pre-washing to 50°C or higher. The amount of items to be washed is obtained, Determine the amount of pre-wash water required to wash the said amount of laundry. The temperatures of the recovered cold water and recovered hot water, which can be used as pre-wash water, are obtained. Based on the acquired recovered chilled water temperature, recovered hot water temperature, the set pre-wash water temperature, and the amount of pre-wash water, the amounts of recovered chilled water and recovered hot water to be supplied to the pre-wash tank are determined. The required amounts of recovered cold water and recovered hot water are supplied to the pre-wash tank in this order via the hydrogen peroxide removal device. A method for supplying pre-wash water to a commercial washing machine. [Claim 14] Set the temperature of the pre-wash water used for pre-washing to 50°C or higher. The recovered water from the rinsing tank, processing tank, or dewatering machine is stored in a recovery tank. The temperature of the stored recovered water is obtained, Based on the set temperature and the acquired temperature, the recovered water sent from the recovery tank to the pre-wash tank is heated and passed through a hydrogen peroxide removal device before being supplied to the pre-wash tank. A method for supplying pre-wash water to a commercial washing machine. [Claim 15] Set the temperature of the pre-wash water used for pre-washing to 50°C or higher. The wastewater from the rinsing or dewatering process is stored as recovered water. The stored recovered water is passed through a heat exchanger and a hydrogen peroxide removal device and heated to the set temperature. A method for supplying pre-wash water in a commercial washing and drying machine, wherein the heated recovered water is supplied to the washing tub as pre-wash water when washing the next item to be washed.

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