AU2003225665A1

AU2003225665A1 - Detergent dispenser

Info

Publication number: AU2003225665A1
Application number: AU2003225665A
Authority: AU
Inventors: John P Furber; John J Rolando; Katherine M Sanville; Allan L Schuman; Eddie D Sowle
Original assignee: Ecolab Inc
Current assignee: Ecolab Inc
Priority date: 2002-03-07
Filing date: 2003-03-05
Publication date: 2003-09-22
Also published as: WO2003075738B1; EP1480547A1; WO2003075738A1; US20030168085A1; CA2471738A1

Description

WO 03/075738 PCT/US03/06647 DETERGENT DISPENSER Background of the Invention 1. Field of the Invention The present invention relates to a detergent dispenser, and more specifically, 5 a detergent dispenser for dispensing a solid detergent into a re-circulating dishwashing machine. 2. Description of the Prior Art Generally, re-circulating dishwashing machines reuse the water used during the wash and rinse cycles in the wash cycle and fresh water is used each time in the 10 rinse cycle. Therefore, as the wash water is diluted by the rinse water, more detergent must be added to return the detergent concentration to the desired level to effectively clean and sanitize the dishes. Currently, conductivity cell sensors are used to measure the concentration of detergent within the wash water storage tank, and when the concentration is low the 15 sensor triggers the dispensing mechanism to add more detergent. Although this works relatively well, it is expensive and is not always accurate. It is possible to under-use or even over-use detergent if the water is heavily soiled or contains acids such as lemon juice thereby providing false readings by the sensor. In addition, timed boards could be used to provide additional detergent at specific times. 20 However, timed boards are relatively expensive and require electricity to operate. Therefore, a more accurate and economical dispensing mechanism is desired. Summary of the Invention In a preferred embodiment detergent dispenser for use with a re-circulating 25 dishwashing machine, the re-circulating dishwashing machine has rinse arms and wash arms. The rinse arms receive and distribute water from a water source during a rinse cycle and the wash arms receive and distribute wash water from a wash water storage tank during a wash cycle. The wash water storage tank has an overflow wash water outlet and a use solution inlet. The water used during the rinse cycle 30 enters the wash water storage tank thereby causing excess wash water to exit the wash water storage tank through the overflow wash water outlet and the wash water 1 WO 03/075738 PCT/US03/06647 becomes diluted. A housing defines a cavity configured and arranged to receive a solid detergent and water from the water source, wherein water from the water source is supplied to the cavity simultaneously as water from the water source is supplied to the rinse arms of the dishwashing machine. The housing has a water 5 inlet, a use solution outlet, and an overflow outlet. The water inlet receives water from the water source, wherein water flows into the cavity, floods the housing and dissolves a portion of the solid detergent to form a use solution. Water flows into the water inlet at a rate faster than the use solution flows out of the use solution outlet to flood the housing. The use solution outlet dispenses substantially all of the 10 use solution out of the housing when the dispenser is not in use. A valve in fluid communication with the water source is operatively connected to the water inlet. The valve controls a desired rate at which water enters the water inlet of the housing from the water source thereby dispensing a desired volume of use solution from the dispenser. An outlet conduit has a first segment and a second segment. The first 15 segment is in fluid communication with the use solution outlet and the second segment is in fluid communication with the overflow outlet. The outlet conduit carries the use solution into a wash water storage tank through a use solution inlet to replenish an amount of use solution in the wash water which was diluted by the rinse water thereby displacing a proportional amount of the wash water which is 20 discharged through an overflow wash water outlet. A preferred embodiment dispenser for dispensing a use solution into a dishwashing machine has rinse arms that receive water from a water source during a rinse cycle. The use solution is created from a portion of a solid detergent dissolved in water from the water source during the rinse cycle. A housing defines a cavity 25 configured and arranged to receive the solid detergent and water from the water source. The housing has a water inlet, a bottom, a use solution outlet, and an overflow outlet. The water inlet receives water from the water source during the rinse cycle concurrently as water is supplied to the rinse arms of the dishwashing machine. Water floods the housing from the bottom and dissolves a portion of the 30 solid detergent to form a use solution. Water flows into the water inlet at a rate faster than the use solution flows out of the use solution outlet to flood the housing. 2 WO 03/075738 PCT/USO3/06647 The use solution outlet dispenses substantially all of the use solution out of the housing when not in use. Tubing is in fluid communication with the water source and the water inlet, wherein water flows from the water source through the tubing and into the water inlet thereby flooding the housing to create the use solution. An 5 outlet conduit is in fluid communication with the use solution outlet and the overflow outlet thereby allowing the use solution to exit the housing. In a preferred embodiment method for dispensing a use solution from a solid detergent into a dishwashing machine, the dishwashing machine has rinse arms and a wash water storage tank. The rinse arms receive water from a water source during 10 a rinse cycle and the wash water storage tank holds wash water supplied to wash arms during a wash cycle. A solid detergent is placed in a dispenser, and the dispenser has a housing defining a cavity configured and arranged to receive the solid detergent and water from the water source. The housing has a water inlet and a use solution outlet. The water inlet receives water from the water source. Water is 15 simultaneously supplied to the rinse arms of the dishwashing machine and to the water inlet of the dispenser thereby allowing the dispenser and the wash water storage tank to be supplied with water during the rinse cycle. Water floods the cavity and dissolves a portion of the solid detergent to form a use solution. Water flows into the water inlet at a rate faster than the use solution flows out of the use 20 solution outlet to flood the cavity. The use solution outlet dispenses substantially all of the use solution out of the housing when the dispenser is not in use. A concentration of the solid detergent is supplied to the wash water by allowing the use solution to enter the wash water storage tank from the use solution outlet. In a preferred embodiment method for dispensing a detergent into a 25 dishwashing machine for washing dishes, the dishwashing machine has rinse arms and a wash water storage tank. The rinse arms receive water from a water source during a rinse cycle and the wash water storage tank holds wash water supplied to wash arms during a wash cycle. The wash water storage tank has an overflow wash water outlet. A solid detergent is placed in a dispenser. The dispenser has a housing 30 defining a cavity configured and arranged to receive the solid detergent and water from a water source. The housing has a water inlet and a use solution outlet. The 3 WO 03/075738 PCT/USO3/06647 water inlet receives water from the water source. Water is simultaneously supplied to the rinse arms and the water inlet. The rinse arms supply a sufficient amount of water to fill a wash water storage tank, and the dispenser is flooded with water whereby a portion of the solid detergent is dissolved to create a use solution. The 5 use solution is allowed to enter the wash water storage tank thereby displacing a first proportional amount of water in the wash water storage tank with the use solution. A sufficient concentration of the solid detergent to effectively wash the dishes is supplied to the wash water, wherein the first proportional amount of water is discharged through an overflow wash water outlet. The wash water is pumped into 10 the wash arms to wash the dishes. Water is simultaneously supplied to the rinse arms and the water inlet thereby rinsing the dishes, supplying water to the wash water storage tank, and supplying the use solution to the wash water storage tank. The excess wash water is disposed of through the overflow wash water outlet and the use solution enters the wash water storage tank thereby displacing a second 15 proportional amount of water in the wash water storage tank with the use solution. A sufficient concentration of the solid detergent to effectively wash the dishes is supplied to the wash water. The second proportional amount of water is discharged through the overflow wash water outlet. In a preferred embodiment method for dispensing a solid detergent into a 20 dishwashing machine, water is simultaneously supplied from a water source to a dispenser and rinse arms of a dishwashing machine during a rinse cycle. The water in the dispenser dissolves a portion of a solid detergent thereby creating a use solution. The use solution flows from the dispenser into the dishwashing machine to be supplied to wash arms of the dishwashing machine during a wash cycle. 25 Brief Description of the Drawings Figure 1 is a perspective view showing a detergent dispenser constructed according to the principles of the present invention; Figure 2 is a top view of the detergent dispenser shown in Figure 1; 30 Figure 3 is a front view of the detergent dispenser shown in Figure 1; Figure 4 is a left side view of the detergent dispenser shown in Figure 1; 4 WO 03/075738 PCT/US03/06647 Figure 5 is a rear view of the detergent dispenser shown in Figure 1; and Figure 6 is an elevational view showing a flow of water through rinse arms of a dishmachine and a detergent dispenser constructed according to the principles of the present invention. 5 Detailed Description of the Preferred Embodiment A preferred embodiment detergent dispenser constructed according to the principles of the present invention is designated as 100 in Figures 1-6. Referring to Figures 1 and 2, the detergent dispenser 100 includes a housing 10 101 having a front side 102, aback side 103, a top 115, and a bottom 119. The back side 103 faces the wall or the mounting surface and the front side 102 faces outward from the wall or the mounting surface. The front side 102 and the back side 103 converge to form a right side 111 and a left side 112. The orientation of the right side 111 and the left side 112 of the dispenser 100 is determined by viewing the 15 front side 102 of the dispenser 100 looking toward the wall or the mounting surface. The bottom encloses the front side 102 and the back side 103 while the top 115 provides an opening 117, which allows access into a cavity 118 formed by the housing 101. A hinge 116 is located proximate the back side 103 and the top 115 of the dispenser for connecting a lid 121 thereto. The lid 121 provides a cover for the 20 opening 117 and the cavity 118. The cavity 118 is configured and arranged to receive a solid detergent block 125 and water from a fresh water source 127. The solid detergent block 125 rests upon a false bottom 120 proximate the bottom 119 of the dispenser. The false bottom 120 is a mesh or screen member that extends across the cavity 118 to 25 position the detergent 125 above the water supply but allows water to pass through to dissolve the detergent 125. The false bottom 120 ensures that the detergent 125 dissolves evenly because the bottom 126 of the detergent 125 is not always in contact with water remaining at the bottom 119 of the dispenser 100. As shown in Figure 5, a mounting member 104 is operatively connected to 30 the back side 103 of the dispenser 100. The mounting member 104 includes flanges with apertures 104a proximate the right side 111 and the left side 112 through which 5 WO 03/075738 PCT/USO3/06647 screws or other means for securing the dispenser 100 to a wall or an attachment surface are placed. The mounting member 104 also includes an aperture 105 proximate the top 115 and the right side 111 of the dispenser 100 through which tubing 130 from a rinse water source 127 is placed to supply the dispenser 100 with 5 fresh water. A valve support member 106 proximate the center of the dispenser 100 below the aperture 105 is also included to support a 1/4 inch valve 122. The valve support member 106 provides a compartment in which the valve 122 is placed and also includes an aperture 108 near the right side 111 of the dispenser for adjusting the valve 122. Proximate the bottom of the valve support member 106 is an aperture 10 107 through which tubing 131 extends from the valve 122 to a water inlet 109 at the bottom 119 of the dispenser 100. A water flow guide member 110 interconnects the tubing 131 to the water inlet 109 and ensures that the water fills from the bottom 119 of the dispenser. An optional vacuum breaker 139 in fluid communication with the tubing 130 ensures that excess water flowing into the water inlet 109 does not return 15 to the water source 127 thereby contaminating the water source 127. Alternately, an air gap could be provided rather than providing the vacuum breaker 139. Providing either the vacuum breaker 139 or an air gap is mandated by the ASSE plumbing code for back flow prevention. A use solution outlet 113 is located proximate the bottom 119 and the left 20 side 112 of the dispenser. The use solution outlet 113 is configured and arranged to allow substantially all of the water and the use solution to flow out of the cavity 118 and into the dishwashing machine 132. When substantially all of the water and the use solution flow out of cavity 118, substantially all means that enough of the water and the use solution are dispensed so that the water and the use solution are not in 25 contact with solid detergent 125. The diameter of the use solution outlet 113 is approximately 3/16 to 1/2 inch. Although it is unlikely that portions of solid detergent 125 would flow out of the cavity 118 along with the use solution, it is possible, especially if solid detergent pellets rather than a block and an overflow outlet 114 is used. The overflow outlet 114 is a 3/16 inch aperture proximate the top 30 115 of the dispenser 100. The overflow outlet 114 allows excess water inside cavity 118 to readily escape in the event too much water flows into the cavity 118 rather 6 WO 03/075738 PCT/USO3/06647 than having the excess water or use solution spill out from the top 115 of the dispenser 100. Therefore, a screen or sieve type member known in the art may be placed over the outlets 113 and 114 to prevent solid detergent 125 from flowing out of the dispenser 100. The use solution outlet 113 and the overflow outlet 114 5 converge proximate the bottom 119 of the dispenser 100 to form an outlet 145. Therefore, the outlet conduit 123 is in fluid communication with both the use solution outlet 113 and the overflow outlet 114 to allow the water and the use solution to flow into the dishwashing machine 132. Use solution outlet 113 is always open and substantially all of the use 10 solution in the cavity 118 is dispensed through the use solution outlet 113. Therefore, no water remains in contact with the bottom of the detergent 125 when no water is flowing into the cavity 113 and the dispenser 100 is not in use. In order for the dispenser 100 to work properly, the rate of flow of water into the cavity 118 should be greater than the rate of flow of the use solution out of the use solution 15 outlet 113 for a time sufficient to flood the cavity 118 and create the use solution. In the preferred embodiment, the rate of water flowing into the dispenser is approximately 0.5 to 1.0 gallons per minute, and the rate of use solution flowing out of the dispenser is approximately 0.1 to 0.2 gallons per minute. Also, the preferred range of the detergent 125 concentration in the use solution is 1.0 to 2.0 % weight to 20 weight. The rate of water flowing into the cavity 118 depends on several factors including the diameter and length of tubing 130, the amount of pressure in the water supply, and the valve 122 setting. The valve 122 may be adjusted to ensure that the desired volume of the use solution is dispensed from the dispenser 100. The maximun outflow of water and use solution from the use solution outlet 113 is 25 approximately 0.5 gallons per minute. An outlet conduit 123 utilizes gravity to allow the use solution to flow from the outlet 145 into the use solution inlet 138 of the dishwashing machine 132. This is shown in Figure 6. The preferred embodiment utilizes a 5/8 inch Mayon Hose (PVC) to carry the use solution to the dishmachine wash water storage tank 135. 30 The outlet conduit 123 is in fluid communication with the use solution outlet 113 and the overflow outlet 114 of the dispenser 100, and the outlet conduit 123 is also 7 WO 03/075738 PCT/USO3/06647 in fluid communication with the use solution inlet 138 of the dishwashing machine 132. Therefore, the outlet conduit 123 and the use solution inlet 138 allow the use solution to enter the wash water storage tank 135 in the dishwashing machine 132. The dishwashing machine 132 is a re-circulating machine, which reuses the 5 water used during the wash and rinse cycles in the wash cycle and uses fresh water each time in the rinse cycle. Therefore, as the wash water is diluted during each rinse water, more detergent must be added to return the detergent concentration to the desired level to effectively clean and sanitize the dishes. The dishwashing machine 132 receives water from a water line 128, which is preferably a 3/4 inch 10 line receiving water from a fresh water source 127. A port 129 having a threaded plug diverts some of the water from the dishwashing machine 132 via water inlet tubing 130 to the dispenser 100. Two 1/8 to 7/8 inch ports are typically available on a dishwashing machine, and the water inlet tubing 130 is preferably a 1/4 to 3/8 inch copper tubing. However, other means well known in the art may be used to divert 15 the water to the dispenser 100. During the rinse cycle, the back pressure of the water flowing into the rinse arms 133 causes the rinse arms 133 to rotate and also causes water to flow through the port 129 and into the water inlet tubing 130. A check valve 142 in the water inlet tubing 130 prevents back flow of water to the dishwashing machine 132. An optional vacuum breaker 139 may be included if the 20 dispenser 100 is mounted above the dishmachine vacuum breaker 140. The dishmachine vacuum breaker 140 is an atmospheric vacuum breaker located approximately 6 inches higher than the dishwashing machine 132 to prevent back flow of water to the fresh water source 127. During the rinse cycle of the dishwashing machine 132, rinse arms 133 25 receive water from the water line 128. During the wash cycle of the dishwashing machine 132, sump 136 pumps wash water from a wash water storage tank 135 into wash arms 134. The wash water storage tank 135 also includes an overflow wash water outlet 137 that allows excess wash water to exit the storage tank 135 rather than overflow the dishwashing machine 132. The excess wash water and rinse water 30 exits the dishwashing machine 132 to the drain through tubing 144. The preferred embodiment dispenser 100 is used with a 15 to 16 gallon 14AM Hobart dishwashing 8 WO 03/075738 PCT/USO3/06647 machine, but the dispenser 100 may be used with any type of re-circulating dishwashing machine. In another embodiment of the present invention, rather than supplying water to the bottom 119 of the dispenser 100, water may be supplied to the top 115 of the 5 dispenser 100. Therefore, the water inlet 109 may be placed at either the bottom 119 or the top 115 of the dispenser 100. Although water may be sprayed onto the detergent 125 or otherwise allowed to contact the detergent 125, this tends to erode the detergent 125 unevenly. Therefore, it is preferred to flood the dispenser 100 from the bottom 119. To ensure that water does not unevenly erode the detergent 10 125, the water flow guide member 110 is positioned proximate the water inlet 109 to guide the water to the bottom 119 of the dispenser 100. This feature is disclosed in U.S. Patent Application 09/550,428, filed April 17, 2000, which is herein incorporated by reference. In operation, as shown in Figure 6, water from the fresh water source 127 15 flows into the water line 128 during the rinse cycle of the dishwashing machine 132. The water has a temperature of approximately 1800 F or higher and flows at a pressure of approximately 20 psi. The fresh water flows from the water line 128 into the rinse arms 133 of the dishwashing machine 132. Because of the back pressure of the water, water also flows into the port 129 that directs the fresh water 20 into the water inlet tubing 130 to the dispenser 100. The water flows simultaneously into the rinse arms 133 and into the dispenser 100 via the water inlet tubing 130. Simultaneously means that water is flowing concurrently into the rinse arms 133 and the dispenser 100 at some time during the rinse cycle. The water could start or stop in one or the other during the rinse cycle, but water is supplied at some point of the 25 rinse cycle to both at the same time. The water from the rinse arms 133 cascades into the wash water storage tank 135. At the start of each day, the wash water storage tank 135 is empty so the cycle begins with an extended rinse cycle to sufficiently fill the tank 135 with fresh water. Depending upon the type of dishwashing machine used, approximately 10 to 30 100 or even greater gallons of fresh water fill the tank 135. This fresh water does not contain any detergent, but the tank 135 receives use solution containing 9 WO 03/075738 PCT/USO3/06647 detergent from the dispenser simultaneously. During subsequent rinse cycles, the wash water containing detergent use solution becomes diluted with approximately 1.5 gallons of fresh rinse water, and the amount of fresh rinse water displaces a proportional amount of wash water, which exits through an overflow wash water 5 outlet. A solenoid 141 connected to the control center (not shown) of the dishwashing machine 132 triggers the rinse cycle to begin, and every time fresh water flows through the dishmachine valve 143, fresh water also fills the dispenser 100 to provide use solution to the wash water storage tank 135. From the port 129, the water flows through the check valve 142 and into the 10 water inlet tubing 130. The check valve 142 ensures that water from the dispenser 100 does not flow into the dishwashing machine 132. If the dispenser 100 is mounted above the dishmachine vacuum breaker 140, an optional vacuum breaker 139 may be included to provide additional assurance that water from the dispenser 100 does not flow into the dishwashing machine 132. Also, an optional restrictor 15 may be provided to reduce the pressure and the flow of the water flowing into the dispenser 100. The water flows through water inlet tubing 130 into valve 122. The valve 122 regulates the amount of water flowing into the tubing 131 and the water inlet 109 via water flow guide member 110. As the water enters the water inlet 109, it floods the cavity 118 from the bottom. The water level rises above the false 20 bottom 120 and contacts the detergent 125, and a portion of the detergent 125 dissolves into the water thereby creating a use solution. The use solution exits the cavity 118 through the use solution outlet 113 by way of a gravity drain. Although the use solution outlet 113 is always open, water floods the cavity 118 at a faster rate than the use solution exits the use solution outlet 113. It takes approximately 2 to 3 25 minutes for the water to fill the cavity 118 to approximately the water level L, as shown in Figures 3 and 4. Therefore an adequate amount of detergent 125 is able to dissolve in the water during the time allowed for the rinse cycle. The use solution flows from the use solution outlet 113 into the outlet 145. However, if the cavity 118 becomes flooded with use solution, excess use solution 30 will exit the dispenser 100 through the overflow outlet 114, in which case the use solution will also flow into the outlet 145. In either instance, the use solution will 10 WO 03/075738 PCT/USO3/06647 flow from the outlet 145 into the use solution inlet 138 of the wash water storage tank 135 via outlet conduit 123. As the use solution enters the storage tank 135, excess wash water in a proportional amount equal to the amount of use solution entering the storage tank 135 flows out of the storage tank 135 via the overflow 5 wash water outlet (not shown). Therefore, the use solution replenishes the wash water that has become diluted during the rinse cycle with additional detergent as it displaces a proportional amount of diluted wash water equal to the amount of use solution entering the storage tank 135. After the rinse cycle has finished and it is time for the next wash cycle to 10 begin, the sump 136 pumps the replenished wash water into the wash arms 134. The wash water from the wash arms 134 cascades back into the wash water storage tank 135 where it again becomes diluted with fresh water from the rinse arms 133 during the subsequent rinse cycle. However, the wash water simultaneously becomes replenished with use solution during the rinse cycle, as described above. This 15 cycling of diluting and replenishing continues for each full wash and rinse cycle. At the end of the day or after the wash water becomes heavily soiled, the wash water storage tank 135 is emptied and must be refilled as at the start of the day described previously. In the preferred embodiment, water floods the cavity 118 from the bottom 20 119 of the dispenser 100 and the water level increases as water flows into the cavity 118 from the water inlet 109. Because of the false bottom 120, water floods the cavity 118 beneath the detergent 125 and then rises above the false bottom 120 to contact the detergent 125. Filling cavity 118 from the bottom minimizes the vortices and the eddies, which tend to erode detergents unevenly. Less impingement occurs 25 when the cavity 118 is filled from the bottom, and this allows for less detergent 125 to be dispensed than is typically dispensed in spray-type dispensers. In addition, this results in more uniform dissolution of the detergent 125 and a relatively constant concentration and shape of the detergent is maintained. Although it is recognized that cavity 118 may be flooded from the top 115, more turbulence in the water will 30 occur and the detergent will likely erode unevenly resulting in a variance in concentration and shape of the detergent as it dissolves. Uniform erosion of the 11 WO 03/075738 PCT/US03/06647 detergent 123 is important because there is a linear relationship between the surface area of the detergent exposed to the water and the number of grams dispensed. Therefore, if the shape of the detergent 125 remains relatively constant, the surface area of the detergent will remain relatively constant and the exposure to water will 5 keep the detergent dispensing rate relatively constant. As cavity 118 is flooded with water from the bottom 119 of the dispenser 100 to a level L proximate the middle of the dispenser, the water contacts the detergent 125 and dissolves a portion of the detergent 125 to create a use solution. In the preferred embodiment, the cavity 118 is flooded approximately three to four 10 inches above the false bottom 120. Only a relatively small portion of the detergent 125 is dissolved each time water fills the cavity 118 and contacts the detergent 125. The amount of water flowing into cavity 118 may be controlled by adjusting the valve 122, which controls the amount of water flowing into the water inlet 109. The water level L is important to ensure that the desired volume of use solution is 15 dispensed into the dishwashing machine. Since different models of dishwashing machines may have different sump sizes, the machines may require different volumes of use solution, and the volume is controlled by allowing either more or less water into cavity 118 of the dispenser 100. Again, the water inlet 109 is larger than the use solution outlet 113 to allow the detergent block 125 adequate time to 20 dissolve into the use solution. No complicated mechanical or electrical devices are required to operate the dispenser 100 because the dispenser 100 works with the rinse cycle of the dishwashing machine 132. All that is needed to control the amount of water entering the dispenser 100, and therefore to control the volume of the use solution containing detergent 125, is the valve 122. However, other means known in 25 the art may also be used such as a restrictor or other devices that control the flow of water. The above specification, examples and data provide a complete description of the manufacture and use of the composition of the invention. Since many embodiments of the invention can be made without departing from the spirit and 30 scope of the invention, the invention resides in the claims hereinafter appended. 12

Claims

1. A detergent dispenser for use with a re-circulating dishwashing machine, the re-circulating dishwashing machine having rinse arms that receive and distribute water from a water source during a rinse cycle and wash arms that receive 5 and distribute wash water from a wash water storage tank during a wash cycle, the wash water storage tank having an overflow wash water outlet and a use solution inlet, wherein water used during the rinse cycle enters the wash water storage tank thereby causing excess wash water to exit the wash water storage tank through the overflow wash water outlet and the wash water becomes diluted, comprising: 10 a) a solid detergent; b) a housing defining a cavity configured and arranged to receive said solid detergent and water from a water source, wherein water from the water source is supplied to said cavity simultaneously as water from the water source is supplied to rinse arms of a dishwashing machine, said housing having a water inlet, a use 15 solution outlet, and an overflow outlet, said water inlet receiving water from the water source, wherein water flows into said cavity, floods said housing and dissolves a portion of said solid detergent to form a use solution, wherein water flows into said water inlet at a rate faster than said use solution flows out of said use solution outlet to flood said housing, and wherein said use solution outlet dispenses substantially all 20 of said use solution out of said housing when the dispenser is not in use; c) a valve in fluid communication with the water source is operatively connected to said water inlet, said valve controlling a desired rate at which water enters said water inlet of said housing from the water source thereby dispensing a desired volume of use solution from the dispenser; and 25 d) an outlet conduit having a. first segment and a second segment, said first segment being in fluid communication with said use solution outlet and said second segment being in fluid communication with said overflow outlet, wherein said outlet conduit carries said use solution into a wash water storage tank through a use solution inlet to replenish an amount of use solution in wash water which was 30 diluted by rinse water thereby displacing a proportional amount of wash water which is discharged through an overflow wash water outlet. 18 WO 2003/075738 PCT/US2003/006647

2. The detergent dispenser of claim 1, wherein said use solution outlet is always open and the water flows into said water inlet at approximately 0.5 to 1.0 gallons per minute and said use solution flows out of said use solution outlet at 5 approximately 0.1 to 0.2 gallons per minute,

3. The detergent dispenser of claim 1, wherein said solid detergent is dispensed in said use solution having a concentration of 1.0 to 2.0 % weight to weight. 10

4. The detergent dispenser of claim 1, wherein uniform dissolution of said solid detergent occurs, thereby maintaining a relatively constant concentration and a relatively constant shape of said solid detergent. 15

5. The detergent dispenser of claim 1, said solid detergent having a bottom, wherein said housing is flooded proximate said bottom of said solid detergent.

6. A method for dispensing a detergent into a dishwashing machine for 20 washing dishes having rinse arms that receive water from a water source during a rinse cycle and a wash water storage tank for holding wash water supplied to wash arms during a wash cycle, the wash water storage tank having an overflow wash water outlet, comprising: a) placing a solid detergent in a dispenser, said dispenser having a 25 housing defining a cavity configured and arranged to receive said solid detergent and water from a water source, said housing having a water inlet and a use solution outlet, said water inlet receiving water from the water source; b) simultaneously supplying water to rinse arms and said water inlet, the rinse arms supplying a sufficient amount of water to fill a wash water storage tank, 30 said dispenser being flooded with water whereby a portion of said solid detergent is dissolved to create a use solution; 19 WO 2003/075738 PCT/US2003/006647 c) allowing said use solution to enter the wash water storage tank thereby displacing a first proportional amount of water in the wash water storage tank with said use solution, wherein a concentration of said solid detergent is supplied to the wash water that is sufficient to effectively wash the dishes, wherein 5 said first proportional amount of water is discharged throug an overflow wash water outlet; d) pumping wash water into wash arms to wash dishes; and e) simultaneously supplying water to the rinse arms and said water inlet thereby rinsing the dishes, supplying water to the wash water storage tank, and 10 supplying said use solution to the wash water storage tank, wherein excess wash water is disposed of through the overflow wash water outlet and said use solution enters the wash water storage tank thereby displacing a second proportional amount of water in the wash water storage tank with said use solution, wherein a concentration of said solid detergent is supplied to the wash water that is sufficient 15 to effectively wash dishes, and wherein said second proportional amount of water is discharged through the overflow wash water outlet.

7. The method of claim 6, wherein steps (d) and (e) are repeated until the wash water is discharged to be replaced with new wash water. 20

8. The method of claim 6, wherein a greater amount of water is used in step (b) to initially fill the wash water storage tank than in step (e) to subsequently rinse the dishes and replenish said use solution in the wash water. 20