Patent Application
20170035265
Contemporary automatic dishwashers for use in a typical household include a tub and at least one rack or basket for supporting soiled dishes within the tub. A spraying system can be provided for recirculating liquid throughout the tub to remove soils from the dishes. The spraying system can include various sprayers including a rotatable sprayer. A diverter valve in the form of a rotary disk is used to selectively supply liquid from a recirculation pump to the various sprayers.
In one aspect, an embodiment of the invention relates to a dishwasher for treating dishes according to an automatic cycle of operation, including a tub at least partially defining a treating chamber, at least one sprayer configured to emit a corresponding spray of liquid into the treating chamber, at least one liquid circuit supplying liquid to the at least one sprayer, a pump having a pump inlet fluidly coupled to the treating chamber and a pump outlet, and a diverter valve having a plenum with a plenum inlet coupled to the pump outlet, at least one plenum outlet fluidly coupled to the at least one liquid circuit, and a membrane strip located within the plenum and having at least one control opening, wherein the membrane strip is movable in the plenum for movement along a path overlying the at least one plenum outlet such that the membrane strip can be selectively moved so as to selectively align the control opening with the at least one plenum outlet to selectively enable liquid flow from the plenum inlet through the at least one plenum outlet to control a flow of liquid from the pump to the at least one sprayer.
In another aspect an embodiment of the invention relates to a diverter valve including a housing defining a plenum with a plenum inlet, at least one plenum outlet and a membrane strip located within the plenum and having at least one control opening and a drive operably coupled to the membrane strip to move the membrane strip within the plenum along a path overlying the at least one plenum outlet such that the membrane strip can be selectively moved so as to selectively align the control opening with the at least one plenum outlet to selectively enable liquid flow from the plenum inlet through the at least one plenum outlet to control a flow of liquid through the housing.
In the drawings:
Referring to
The cabinet 12 encloses a tub 14 at least partially defining a treating chamber 16 for holding dishes for washing according to a cycle of operation and defining an access opening 17. The tub 14 has spaced top and bottom walls 18 and 20, spaced sidewalls 22, a front wall 24, and a rear wall 26. In this configuration, the walls 18, 20, 22, 24, and 26 collectively define the treating chamber 16 for treating or washing dishes. The bottom wall 20 may have a front lip 28 (
Referring to
The first lower spray assembly 40 is positioned above the bottom wall 20 and beneath the lower dish rack 36. The first lower spray assembly 40 is an arm configured to rotate in the wash tub 14 and spray a flow of liquid from a plurality of spray nozzles or outlets, in a primarily upward direction, over a portion of the interior of the wash tub 14. A first wash zone may be defined by the spray field emitted by the first lower spray assembly 40 into the treating chamber 16. The spray from the first lower spray assembly 40 is sprayed into the wash tub 14 in typically upward fashion to wash dishes located in the lower dish rack 36. The first lower spray assembly 40 may optionally also provide a liquid spray downwardly onto a lower portion of the treating chamber 16, but for purposes of simplification, this will not be illustrated or described herein.
The second lower spray assembly 42 is illustrated as being located adjacent the lower rack 36 toward the rear of the treating chamber 16. The second lower spray assembly 42 is illustrated as including a horizontally oriented distribution header or spray manifold having a plurality of nozzles. The second lower spray assembly 42 may not be limited to this position; rather, the second lower spray assembly 42 could be located in virtually any part of the treating chamber 16. Alternatively, the second lower spray assembly 42 could be positioned underneath the lower rack 36, adjacent or beneath the first lower spray assembly 40. Such a spray manifold is set forth in detail in U.S. Pat. No. 7,594,513, issued Sep. 29, 2009, and titled “Multiple Wash Zone Dishwasher,” which is incorporated herein by reference in its entirety. The second lower spray assembly 42 may be configured to spray a flow of treating liquid in a generally lateral direction, over a portion of the interior of the treating chamber 16. The spray may be typically directed to treat dishes located in the lower rack 36. A second wash zone may be defined by the spray field emitted by the second lower spray assembly 42 into the treating chamber 16. When both the first lower spray assembly 40 and the second lower spray assembly 42 emit spray fields the first and second zones may intersect.
The third lower spray assembly 44 can be similar to the second lower spray assembly 42 and has been illustrated as being located on a sidewall 22. The third lower spray assembly can be configured to spray a flow of treating liquid in an angled direction, over a portion of the interior of the treating chamber 16 including a portion of the lower rack 36. Again, the third lower spray assembly can be located in virtually any part of the treating chamber, can be shaped in any suitable manner, and its spray may be directed in any suitable direction.
The first mid-level spray assembly 46 has been illustrated similarly to the third lower spray assembly 44; however, it has been illustrated as being higher on the sidewall 22 such that it can emit a spray of liquid onto the upper dish rack 34. The first mid-level spray assembly 46 can be located in virtually any part of the treating chamber, can be shaped in any suitable manner, and its spray may be directed in any suitable direction.
The second mid-level spray arm assembly 48 is positioned between the upper dish rack 34 and the lower dish rack 36. Like the first lower spray assembly 40, the mid-level spray assembly 48 may also be configured to rotate in the dishwasher 10 and spray a flow of liquid in a generally upward direction, over a portion of the interior of the wash tub 14. In this case, the spray from the second mid-level spray arm assembly 48 is directed to dishes in the upper dish rack 34 to define a third spray zone. In contrast, the upper spray arm assembly 50 is positioned above the upper dish rack 34 and generally directs a spray of liquid in a generally downward direction to define a fourth spray zone that helps wash dishes on both upper and lower dish racks 34, 36.
A sump 52 and pump assembly 53 can be included in the liquid recirculation system 38. The sump 52 collects the liquid sprayed in the treating chamber 16 and can be formed by a sloped or recessed portion of a bottom wall 20 of the tub 14. The pump assembly 53 can include both a wash or recirculation pump 54 and a drain pump 56. The drain pump 56 can draw liquid from the sump 52 through a drain inlet 55 and pump the liquid out of the dishwasher 10 to a household drain line 57. The recirculation pump 54 can draw liquid from the sump 52 and pump the liquid to the one or more of the spray assemblies 40-50 to supply liquid into the treating chamber 16. While the pump assembly 53 is illustrated as having separate drain and recirculation pumps 54 and 56 in an alternative embodiment, the pump assembly 53 can include a single pump configured to selectively supply wash liquid to either the spray assemblies 40-50 or the drain line 57, such as by configuring the pump to rotate in opposite directions, or by providing a suitable valve system. While not shown, a liquid supply system can include a water supply conduit coupled with a household water supply for supplying water to the sump 52.
As shown herein, the recirculation pump 54 has a pump inlet 58 fluidly coupled to the treating chamber 16 via the sump 52 and a pump outlet 60 in fluid communication with a diverter valve 62. A number of liquid conduits 64, 66, 68, 70, 72, and 74 in turn fluidly couple the diverter valve 62 to the spray assemblies 40-50, respectively. In this manner, the pump outlet 60 is fluidly coupled to the spray assemblies 40-50 for discharging wash liquid from the recirculation pump 54 to the spray assemblies 40-50. As illustrated, liquid can be supplied to the spray assemblies 42-50 through liquid conduits 66, 68, 70, 72, and 74 that extend generally rearward from the recirculation pump 54 and upwardly along a rear wall of the tub 14. Liquid can be supplied to the spray assembly 40 through the liquid conduit 64.
The diverter valve 62 can control the flow of liquid within the dishwasher 10. While the diverter valve 62 has been illustrated as being located in the middle of the tub 14 it will be understood that the diverter valve 62 can be located in any suitable location. By way of further non-limiting example, the diverter valve 62 as described herein has a low profile, which allows for it to be located at the rear of the tub 14.
Liquid may be selectively supplied to a subset of all of the sprayers, including to only a singer sprayer, and/or simultaneously to all of the sprayers. The sump 52, recirculation pump 54, spray assemblies 40-50, and liquid conduits 64-74 collectively form a recirculation flow path in the liquid recirculation system 38. It will be understood that the recirculation flow path includes multiple recirculation circuits, with each circuit coupled to at least one of the sprayers forming the spray assemblies 40-50. The recirculation pump 54 may be fluidly coupled to one or more of the circuits such that it draws liquid in through the pump inlet 58 and sump 52 and delivers it to one or more of the spray assemblies 40-50 through the liquid conduits 64-74 depending on the operation of the diverter valve 62. The liquid is sprayed back into the treating chamber 16 through the spray assemblies 40-50 and drains back to the sump 52 where the process may be repeated.
A heating system having a heater 78 can be located within or near the sump 52 for heating liquid contained in the sump 52. A filtering system (not shown) can be fluidly coupled with the recirculation flow path for filtering the recirculated liquid.
A control panel or user interface 80 provided on the dishwasher 10 and coupled to a controller 82 may be used to select a cycle of operation. The user interface 80 may be provided on the cabinet 12 or on the outer panel of the door 32 and can include operational controls such as dials, lights, switches, and displays enabling a user to input commands to the controller 82 and receive information about the selected cycle of operation. The dishwasher 10 may further include other conventional components such as additional valves, a dispensing system for dispensing treating chemistries or rinse aids, spray arms or nozzles, etc.; however, these components are not germane to the present invention and will not be described further herein.
As illustrated in
A valve body in the form of a membrane strip 110 can be located within the plenum 101 and have at least one control opening 112. The membrane strip 110 can abut portions of the housing 100 to form a liquid seal between the plenum outlets 104 and the remainder of the plenum 101. More specifically, the membrane strip 110 can abut an interior surface 114 (
A spool 120 is illustrated in
It is contemplated that any number of spools can be included within the diverter valve 62 to hold the membrane strip 110 in place and aid in driving the membrane strip 110. In the illustrated example, the membrane strip 110 includes a looped membrane strip formed from a continuous band. The membrane strip 110 runs along the plenum outlets 104 and is held in place by a set of spools 120, 140. The spools 120, 140 are spaced apart from each other and the plenum outlets 104 lie between the two spools 120, 140. The continuous membrane strip 110 can have opposing ends 136, 138 with each end 136, 138 supported about a corresponding spool 120, 140, respectively.
The membrane strip 110 can be moveable utilizing any suitable driver or actuator. For example, one of the two spools 120, 140 can be driven externally to provide the rotation of the membrane strip 110. A drive including, but not limited to, a drive motor 130 can be operably coupled to the membrane strip 110 to move the membrane strip 110 within the plenum 101. By way of non-limiting example, the drive motor 130 has been illustrated as including an output shaft 132 that is operably coupled to the spool 120 to provide a driving force that turns the membrane strip 110. It is contemplated that the drive motor 130 can be a reversible drive motor and can be operably coupled to the controller 82 or another suitable controller. The controller 82 can control the operation of the drive motor 130 such that the membrane strip 110 can be driven in either a clockwise or counter-clockwise direction. In this manner the motor 130 can move the membrane strip 110 between any number of positions to fluidly couple any of the plenum outlets 104. A sensor (not shown) can be included in the dishwasher 10 including, but not limited to, that the sensor can be coupled with the diverter valve 62 to determine what plenum outlet 104 is fluidly coupled to the recirculation pump 54. Thus, if the position of the control opening 112 is somehow lost by the controller 82, the controller 82 can utilize the output from the sensor to determine the position of the control opening 112 and can control the movement of the membrane strip 110 based thereon.
The friction between the spool 120 and the membrane strip 110 may not be substantial enough to ensure rotation of the membrane strip 110. Thus, a sprocket 122 having teeth 124 can be included on the spool 120. The membrane strip 110 includes holes 126 that mesh with the teeth 124 of the sprocket 122 and the contact between the teeth 124 and the holes 126 aids in driving the membrane strip 110.
An optional gear train 134 has been illustrated as operably coupling the output shaft 132 to the spool 120 such that rotation of the output shaft 132 moves the gear train 134, which in turn rotates the spool and moves the membrane strip 110 to any number of positions. The gear train 134 can be formed in any suitable manner including, but not limited to, that the gear train 134 can be a speed increasing gear train where the sprocket 122 is driven faster than the rotation of the shaft 132. The gear ratios of the gear train 134 can be selected in any suitable manner to control the movement of the membrane strip 110 based on the rotation of the shaft 132.
In the illustrated example, the membrane strip 110 has a control opening 112 in it that is aligned such that one of the bank of plenum outlets 104 is fluidly coupled at a time, such that liquid is provided to one of the spray assemblies 40-50 at a time. Illustrated in phantom are additional multiple control openings 112. The use of additional multiple control openings 112, including control openings 112 spaced closely together can allow multiple spray assemblies 40-50 to be fluidly coupled to the recirculation pump 54 simultaneously. Alternatively, the use of multiple control openings 112 can be utilized to vary the sequencing of the fluidly coupled spray assemblies 40-50 depending on the location of the control openings 112 and the plenum outlets 104 in the housing 100. It is also contemplated that the membrane strip 110 can include various sets of control openings 112 and the various sets of control openings 112 can define different liquid diversion or spray configurations or can be utilized for the same diversion configurations but allow for them to cycle through the path more frequently.
In this manner it will be understood that the membrane strip 110 can have different sets of openings for different functionalities or different phases of the wash cycle. By way of non-limiting example, a different set of control openings 112 could be provided for each selectable wash cycle, phase, or option. For example, a set of control openings 112 that are only supplied to the upper rack sprayers can be included for when a user selects an option to only wash in the upper rack 34. In this manner, a user can pick a zone or rack for washing and only those zones or rack would be sprayed. Alternatively, if a concentrated wash was selected, during one part of the cycle the second lower spray assembly 42 could be solely supplied to clean the dishes in the lower rack 36.
Such a sealing ring 150 can also allow the control opening 112 to fluidly couple with the plenum outlet 104 so long as the control opening 112 is at least partially within the sealing ring 150. In this manner, the sealing ring 150 creates a larger effective outlet and allows for a longer fluid communication between the plenum outlet 104 having the sealing ring 150 and the control opening 112 in the membrane strip 110. Such sealing rings are set forth in detail in application Ser. No. 13/570,511, filed Aug. 9, 2012, and titled “Dishwasher with Spray System,” which is incorporated herein by reference in its entirety.
The operation of the dishwasher 10 with the diverter valve 62 as illustrated will now be described. The user will initially select a cycle of operation via the user interface 80, with the cycle of operation being implemented by the controller 82 controlling various components of the dishwasher 10 to implement the selected cycle of operation in the treating chamber 16. Examples of cycles of operation include normal, light/china, heavy/pots and pans, and rinse only. The cycles of operation can include one or more of the following phases: a wash phase, a rinse phase, and a drying phase. The wash phase can further include a pre-wash phase and a main wash phase. The rinse phase can also include multiple phases such as one or more additional rinsing phases performed in addition to a first rinsing. During such cycles, wash fluid, such as water and/or treating chemistry (i.e., water and/or detergents, enzymes, surfactants, and other cleaning or conditioning chemistry) passes from the recirculation pump 54 into the liquid recirculation system 38 and then exits through the spray assemblies 40-50.
During the cycle of operation the recirculation pump 54 can be operated to recirculate liquid to one or more of the spray assemblies 40-50. To fluidly couple the one or more of the spray assemblies 40-50 with the output of the recirculation pump 54, the membrane strip 110 can be selectively moved so as to selectively align the control opening(s) 112 with one or more of plenum outlets 104 to selectively enable liquid flow from the plenum 101 through the one or more plenum outlets 104 to control a flow of liquid from the recirculation pump 54 to the one of the spray assemblies 40-50.
The drive motor 130 can then be operated, including via the controller 82, to provide a driving force that turns the sprocket 122 and causes movement of the membrane strip 110 and the control opening 112 to a different position so that a different spray assembly can be fluidly coupled with the recirculation pump 54. By way of further non-limiting example,
The above-described embodiments provide a variety of benefits including that a diverter valve can be utilized to fluidly couple a pump outlet to any number of spray assemblies while fluidly sealing off other spray assemblies. Unlike current diverter valves the above-described embodiments are easy to control, allow for a large number of fluidly couplings, properly seal off other outlets, and have less flow restrictions and bends. The above-described diverter valve embodiments also utilize space efficiently and are low profile and thus can be placed in various places including at the back of the tub, which can eliminate multiple elbows the fluid must pass through and significantly decreases head.
To the extent not already described, the different features and structures of the various embodiments can be used in combination with each other as desired. That one feature cannot be illustrated in all of the embodiments is not meant to be construed that it cannot be, but is done for brevity of description. Thus, the various features of the different embodiments can be mixed and matched as desired to form new embodiments, whether or not the new embodiments are expressly described. All combinations or permutations of features described herein are covered by this disclosure. Further, while the invention has been specifically described in connection with certain specific embodiments thereof, it is to be understood that this is by way of illustration and not of limitation.
The patentable scope of the invention is defined by the claims, and can include other examples that occur to those skilled in the art. It will be understood that any features of the above-described embodiments can be combined in any manner. Reasonable variation and modification are possible within the scope of the forgoing disclosure and drawings without departing from the spirit of the invention, which is defined in the appended claims.
