Patent Application
20120291821
The present disclosure relates to a water inlet flush for a dishwasher filter.
Conventional dishwasher systems include a main pump assembly and a drain pump assembly for circulating and draining wash fluid, respectively, within a wash chamber defined within the dishwasher system. The main pump assembly feeds wash fluid to various spray arm assemblies for distribution throughout the wash chamber to wash soiled items loaded into dishwasher racks positioned within the wash chamber. Wash fluid sprayed onto the dishwasher items is collected in a sump located in a lower portion of the wash chamber, and water entering the sump is filtered through one or more coarse filters to remove soil and/or sediment from the wash fluid. At least some conventional dishwasher systems further include a filter system in flow communication with the main pump assembly to remove soil and/or sediment of a smaller particle size than those particles filtered by the coarse filters. The main pump assembly draws wash fluid from the sump to re-circulate in the wash chamber, and the coarse and fine filters are used to continuously filter the water in the sump during the re-circulation process.
Such filter systems require periodic removal for cleaning by a consumer in which consumers are expected to remove, clean, and properly reinstall filter components on a regular basis. Unfortunately, problems can occur when consumers fail to maintain filter components on a regular basis. For example, dishwasher performance can be degraded by the presence of excess debris which can obstruct water flow.
Accordingly, a dishwasher filter assembly that decreases the need for consumer interaction would be desirable. A water inlet that is capable of purging a filter assembly while also providing additional functionality would be particularly useful.
Aspects and advantages of the disclosure will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the disclosure.
In certain embodiments of the present disclosure, a fluid filtration assembly for a dishwasher system is described. The dishwasher system includes a tub defining a wash chamber configured to receive dishwasher contents. The fluid filtration assembly includes a filter assembly having a filter material, a filter fluid inlet, and a filter fluid outlet. The filter fluid inlet is in flow communication with the wash chamber and the filter material. The filter assembly further includes a cleaning fluid inlet that is configured to backflush the filter material. The filter fluid outlet is in flow communication with both the cleaning fluid inlet and the filter fluid inlet. The fluid filtration assembly further includes a valve assembly in flow communication with the cleaning fluid inlet through a first flow path.
In yet other embodiments of the present disclosure, a dishwasher is described. The dishwasher includes a tub defining a wash chamber configured to receive dishwasher contents. The dishwasher further includes a fluid filtration assembly. The fluid filtration assembly includes a filter assembly having a filter material, a filter fluid inlet, and a filter fluid outlet. The filter fluid inlet is in flow communication with the wash chamber and the filter material. The filter assembly further includes a cleaning fluid inlet that is configured to backflush the filter material. The filter fluid outlet is in flow communication with both the cleaning fluid inlet and the filter fluid inlet. The fluid filtration assembly further includes a valve assembly in flow communication with the cleaning fluid inlet through a first flow path.
These and other features, aspects and advantages of the present disclosure will become better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
A full and enabling disclosure, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended figures, in which:
The present disclosure relates to a water inlet flush for a dishwasher filter. Utilization of such a water inlet decreases the need for consumer interaction and can allow for a more efficient draining operation. Advantageously, the water inlet of the present disclosure is also capable of providing additional functionality, such as a dedicated silverware spray. Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
Dishwasher 100 includes a cabinet 102 having a tub 104 therein and forming a wash chamber 106. Tub 104 includes a front opening (not shown in
Upper and lower guide rails 124, 126 are mounted on tub side walls 128 and accommodate upper and lower roller-equipped racks 130, 132, respectively. Each of upper and lower racks 130, 132 is fabricated from known materials into lattice structures including a plurality of elongate members 134, and each rack 130, 132 is adapted for movement between an extended loading position (not shown) in which at least a portion of the rack is positioned outside wash chamber 106, and a retracted position (shown in
A control input selector 136 is mounted at a convenient location on an outer face 138 of door 120 and is coupled to known control circuitry (not shown) and control mechanisms (not shown) for operating a fluid circulation assembly (not shown in
A lower spray-arm-assembly 144 is rotatably mounted within a lower region 146 of wash chamber 106 and above tub sump portion 142 so as to rotate in relatively close proximity to lower rack 132. A mid-level spray-arm assembly 148 is located in an upper region of wash chamber 106 in close proximity to upper rack 130 and at a sufficient height above lower rack 132 to accommodate items such as a dish or platter (not shown) that is expected to be placed in lower rack 132. In a further embodiment, an upper spray arm assembly (not shown) is located above upper rack 130 at a sufficient height to accommodate a tallest item expected to be placed in upper rack 130, such as a glass (not shown) of a selected height.
Lower and mid-level spray-arm assemblies 144, 148 and the upper spray arm assembly are fed by the fluid circulation assembly, and each spray-arm assembly includes an arrangement of discharge ports or orifices for directing washing liquid onto dishes located in upper and lower racks 130, 132, respectively. The arrangement of the discharge ports in at least lower spray-arm assembly 144 results in a rotational force as washing fluid flows through the discharge ports. The resultant rotation of lower spray-arm assembly 144 provides coverage of dishes and other dishwasher contents with a washing spray. In various alternative embodiments, mid-level spray arm 148 and/or the upper spray arm are also rotatably mounted and configured to generate a swirling spray pattern above and below upper rack 130 when the fluid circulation assembly is activated.
Tub 104 and tub sump portion 142 are downwardly sloped toward sump 150 so that water sprayed from lower spray arm assembly 144, mid-level spray arm assembly 148 (shown in
A filter assembly 190 is located in flow communication with sump 150 such as within sump 150 adjacent to tub sump portion 142. As wash fluid is pumped into lower spray arm 144 to generate a washing spray in wash chamber 106, wash fluid drains into filter assembly 190 to filter wash fluid sediment and particles before flowing into sump 150 over tub sump portion 142.
A drain check valve 186 is established in flow communication with sump 150 and opens or closes flow communication between sump 150 and a drain pump inlet 188. A drain pump 189 is in flow communication with drain pump inlet 188 and includes an electric motor for pumping fluid at inlet 188 to a pump discharge (not shown in
Referring to
During normal operation, wash fluid flows through filter screen 210 into sump 150 and larger food particles from dishes or silverware collect on filter screen 210. Wash fluid is further filtered by coarse filter 208 and fine filter 206 before arriving in sump 150. Filter assembly 190 can be seated in or around sump 150 using any suitable method as would be known in the art such as twist lock or the like so as to allow easy removal user removal of filter assembly or parts thereof and reinsertion of same.
In accordance with the present disclosure, inlet flow from water valve 200 can be utilized to purge filter assembly 190 and minimize user removal and service of filter assembly 190. After passing through filter assembly 190, inlet flow can be utilized to fill dishwasher with water for the cleaning cycle. In this regard, inlet water from a building plumbing system water supply pipe 202 can be split between filter assembly 190 and a separate flow line that can supply one or more sprayers in wash chamber 106 as will be described in more detail herein. For instance, referring to
In addition to a y valve, any other suitable water valves are contemplated for use in connection with the present disclosure. For example, valve 200 can be include an actuated valve, such as a solenoid valve, which can send water flow to filter assembly 190 intermittently based on water needs for dishwashing. Such a solenoid valve can be actuated as would be understood in the art by a controller or the like.
In addition to water flow for filter assembly 190, as described previously, water from water valve 200 can also be routed to one or more dedicated sprayers 222 within dishwasher. Sprayer(s) 222 can be of any suitable form as would be known in the art. Flow can be split from the flow paths created by valve 200 to include such sprayer(s). Alternatively, flow can be split by additional valve 220 (illustrated in
In certain embodiments, sprayer(s) can be positioned adjacent to one or more silverware baskets to spray silverware with clean water.
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
