Patent Grant
11484180
Dishwashers are used in many single-family and multi-family residential applications to clean dishes, silverware, cutlery, cups, glasses, pots, pans, etc. (collectively referred to herein as “utensils”). Many dishwashers rely primarily on rotatable spray arms that are disposed at the bottom and/or top of a tub and/or are mounted to a rack that holds utensils. A spray arm is coupled to a source of wash fluid and includes multiple apertures for spraying wash fluid onto utensils, and generally rotates about a central hub such that each aperture follows a circular path throughout the rotation of the spray arm. The apertures may also be angled such that force of the wash fluid exiting the spray arm causes the spray arm to rotate about the central hub.
While traditional spray arm systems are simple and mostly effective, they have the shortcoming that they must spread the wash fluid over all areas equally to achieve a satisfactory result. In doing so, resources such as time, energy and water are generally wasted because wash fluid cannot be focused precisely where it is needed. Moreover, because spray arms follow a generally circular path, the corners of a tub may not be covered as thoroughly, leading to lower cleaning performance for utensils located in the corners of a rack. In addition, in some instances the spray jets of a spray arm may be directed to the sides of a wash tub during at least portions of the rotation, leading to unneeded noise during a wash cycle.
A different approach to traditional spray arm systems utilizes one or more tubular spray elements to spray utensils within a dishwasher. A tubular spray element is a type of rotatable conduit that both conveys wash fluid along its length and ejects the wash fluid through various apertures disposed on an exterior surface thereof. A tubular spray element is generally formed of an elongated body and rotates about a longitudinal axis thereof, either in a controllable or uncontrollable fashion, e.g., based upon an electric drive, a hydraulic drive, or as a result of rotational forces imparted by the ejection of wash fluid from the tubular spray element.
It has been found, however, that in some instances the arrangement of apertures on a tubular spray element may generate a spray pattern that is better suited for some applications than for others. The effectiveness of a particular spray pattern may vary based upon the placement of utensils within a dishwasher as well as the types of utensils and the amount of soiling thereon. A spray pattern that directs a few high pressure jets at a limited number of locations may be useful for heavily soiled items that are positioned within those locations, yet may not be as useful for a fully loaded dishwasher where multiple utensils are located in areas where gaps exist in the spray pattern. Since the manner in which utensils may be loaded into a dishwasher can vary substantially from cycle to cycle, tradeoffs are generally made in the design of the spray pattern to provide acceptable performance across the various types of loads that a dishwasher may encounter.
The herein-described embodiments address these and other problems associated with the art by providing a dishwasher, dishwasher sprayer, and method of spraying in which a tubular spray element is provided with multiple selectable spray patterns that can be used during a wash cycle. In some instances, multiple selectable spray patterns may be supported through the use of a multi-walled tubular spray element having concentric wall sections that are movable relative to one another to selectively activate one or more apertures and thereby modify a spray pattern emitted by the tubular spray element. In other instances, multiple selectable spray patterns may be supported through the use of a multi-chamber tubular spray element in which different sets of apertures are in fluid communication with different internal chambers in the tubular spray element and flow is selectively controlled to one or more of the chambers.
Therefore, consistent with one aspect of the invention, a dishwasher may include a wash tub, a fluid supply configured to supply a wash fluid, and a tubular spray element disposed within the wash tub and being rotatable about a longitudinal axis thereof, the tubular spray element including a plurality of apertures in fluid communication with the fluid supply to direct wash fluid into the wash tub, and the tubular spray element having a plurality of selectable spray patterns that differ from one another, each of the plurality of selectable spray patterns configured to direct wash fluid from at least a subset of the plurality of apertures.
Some embodiments may also include a tubular spray element drive coupled to the tubular spray element and configured to rotate the tubular spray element about the longitudinal axis, and a controller coupled to the tubular spray element drive to control rotation of the tubular spray element, the controller further configured to control selection of a spray pattern among the plurality of selectable spray patterns for the tubular spray element such that the tubular spray element operates using multiple selectable spray patterns during a wash cycle.
Also, in some embodiments, the controller is configured to control selection of the spray pattern by controlling rotation of the tubular spray element with the tubular spray element drive. In addition, some embodiments may further include a tubular spray element spray pattern selector configured to select from among the plurality of selectable spray patterns, and the controller is configured to control selection of the spray pattern by controlling the tubular spray element spray pattern selector independent of rotation of the tubular spray element by the tubular spray element drive.
Further, in some embodiments, the plurality of selectable spray patterns include first and second selectable spray patterns, the tubular spray element is a multi-walled tubular spray element having first and second concentric wall sections, the first concentric wall section includes a first set of apertures from the plurality of apertures and the second concentric wall section includes a second set of apertures from the plurality of apertures, the first and second concentric wall sections are movable relative to one another between at least first and second positions, when the first and second concentric wall sections are in the first position, at least a first subset of apertures from the first set of apertures is aligned with at least a first subset of apertures from the second set of apertures such that wash fluid from the fluid supply is emitted through the first subsets of apertures of the first and second sets of apertures to form the first selectable spray pattern, and when the first and second concentric wall sections are in the second position, at least a second subset of apertures from the first set of apertures is aligned with at least a second subset of apertures from the second set of apertures such that wash fluid from the fluid supply is emitted through the second subsets of apertures of the first and second sets of apertures to form the second selectable spray pattern that is different from the first selectable spray pattern.
In some embodiments, the first and second concentric wall sections fully circumscribe the longitudinal axis of the tubular spray element. In addition, in some embodiments, at least one of the first and second concentric wall sections does not fully circumscribe the longitudinal axis of the tubular spray element. In some embodiments, the first and second concentric wall sections are movable relative to one another along the longitudinal axis of the tubular spray element to select between the first and second selectable spray patterns. In addition, in some embodiments, the first and second concentric wall sections are rotatable relative to one another about the longitudinal axis of the tubular spray element to select between the first and second selectable spray patterns.
In addition, some embodiments may further include first and second rotational limits configured to limit relative rotation of the first and second concentric wall sections beyond each of the first and second positions, and a tubular spray element drive coupled to the tubular spray element and configured to rotate the second concentric wall section of the tubular spray element about the longitudinal axis. When the tubular spray element drive rotates the second concentric wall section of the tubular spray element in a first direction, the first rotational limit maintains the first and second concentric wall sections in the first position, when the tubular spray element drive rotates the second concentric wall section of the tubular spray element in a second direction, the second rotational limit maintains the first and second concentric wall sections in the second position, and when the tubular spray element drive reverses rotation between the first and second directions, the first and second concentric wall sections rotate between the first and second positions. Some embodiments may also include a frictional coupling coupled to the first concentric wall section to restrict rotation of the first concentric wall section to facilitate rotation of the first and second concentric wall sections between the first and second positions when the tubular spray element drive reverses rotation.
In some embodiments, the first and second subsets of apertures from the second set of apertures are the same. Moreover, in some embodiments, the first and second subsets of apertures from the first set of apertures are different, and the first concentric wall section is housed within the second concentric wall section.
In some embodiments, the plurality of apertures includes a first set of apertures configured to emit a first selectable spray pattern from among the plurality of selectable spray patterns and a second set of apertures configured to emit a second selectable spray pattern from among the plurality of selectable spray patterns that is different from the first selectable spray pattern, the tubular spray element further includes a plurality of internal chambers extending along the longitudinal axis, and the dishwasher further includes a diverter valve coupled intermediate the tubular spray element and the fluid supply and configured to restrict fluid flow to at least one of the plurality of internal chambers while allowing fluid flow to at least one other of the plurality of internal chambers during rotation of the tubular spray element such that when the first set of apertures is aligned with an internal chamber among the plurality of internal chambers to which fluid flow is allowed and the second set of apertures is aligned with an internal chamber among the plurality of internal chambers to which fluid flow is restricted, wash fluid is emitted from the first set of apertures in the first selectable spray pattern, and when the first set of apertures is aligned with an internal chamber among the plurality of internal chambers to which fluid flow is restricted and the second set of apertures is aligned with an internal chamber among the plurality of internal chambers to which fluid flow is allowed, wash fluid is emitted from the second set of apertures in the second selectable spray pattern.
In addition, in some embodiments, the first and second sets of apertures are circumferentially offset from one another about the longitudinal axis. In some embodiments, the tubular spray element includes an outer wall through which the plurality of apertures project and an internal partition that defines the plurality of internal chambers. Moreover, in some embodiments, the internal partition rotates with the outer wall during rotation of the tubular spray element such that the first and second sets of apertures remain aligned with respective first and second internal chambers among the plurality of internal chambers during rotation of the tubular spray element and such that the diverter valve restricts fluid flow to different internal chambers at different rotational positions of the tubular spray element.
Also, in some embodiments, the outer wall rotates relative to the internal partition during rotation of the tubular spray element such that the first and second sets of apertures align with different internal chambers among the plurality of internal chambers during rotation of the tubular spray element. In some embodiments, the internal partition is maintained at a fixed rotational position relative to the diverter valve such that the diverter valve allows fluid flow to at least one of the internal chambers among the plurality of internal chambers throughout rotation of the tubular spray element.
Consistent with another aspect of the invention, a dishwasher may include a wash tub, a fluid supply configured to supply a wash fluid, and a multi-walled tubular spray element disposed within the wash tub and being rotatable about a longitudinal axis thereof. The tubular spray element is in fluid communication with the fluid supply and has first and second concentric wall sections, the first concentric wall section includes a first set of apertures and the second concentric wall section includes a second set of apertures, the first and second concentric wall sections are movable relative to one another between at least first and second positions, when the first and second concentric wall sections are in the first position, at least a first subset of apertures from the first set of apertures is aligned with at least a first subset of apertures from the second set of apertures such that wash fluid from the fluid supply is emitted through the first subsets of apertures of the first and second sets of apertures to form a first selectable spray pattern, and when the first and second concentric wall sections are in the second position, at least a second subset of apertures from the first set of apertures is aligned with at least a second subset of apertures from the second set of apertures such that wash fluid from the fluid supply is emitted through the second subsets of apertures of the first and second sets of apertures to form a second selectable spray pattern that is different from the first selectable spray pattern.
Consistent with another aspect of the invention, a dishwasher may include a wash tub, a fluid supply configured to supply a wash fluid, a multi-chambered tubular spray element disposed within the wash tub and being rotatable about a longitudinal axis thereof, the tubular spray element including a plurality of apertures in fluid communication with the fluid supply to direct wash fluid into the wash tub, the plurality of apertures including a first set of apertures configured to emit a first selectable spray pattern and a second set of apertures configured to emit a second selectable spray pattern that is different from the first selectable spray pattern, the tubular spray element further including a plurality of internal chambers extending along the longitudinal axis, and a diverter valve coupled intermediate the tubular spray element and the fluid supply and configured to restrict fluid flow to at least one of the plurality of internal chambers while allowing fluid flow to at least one other of the plurality of internal chambers during rotation of the tubular spray element such that when the first set of apertures is aligned with an internal chamber among the plurality of internal chambers to which fluid flow is allowed and the second set of apertures is aligned with an internal chamber among the plurality of internal chambers to which fluid flow is restricted, wash fluid is emitted from the first set of apertures in the first selectable spray pattern, and when the first set of apertures is aligned with an internal chamber among the plurality of internal chambers to which fluid flow is restricted and the second set of apertures is aligned with an internal chamber among the plurality of internal chambers to which fluid flow is allowed, wash fluid is emitted from the second set of apertures in the second selectable spray pattern.
These and other advantages and features, which characterize the invention, are set forth in the claims annexed hereto and forming a further part hereof. However, for a better understanding of the invention, and of the advantages and objectives attained through its use, reference should be made to the Drawings, and to the accompanying descriptive matter, in which there is described example embodiments of the invention. This summary is merely provided to introduce a selection of concepts that are further described below in the detailed description, and is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter.
In some embodiments consistent with the invention, a tubular spray element may support multiple selectable spray patterns that can be used during a wash cycle. In some instances, multiple selectable spray patterns may be supported through the use of a multi-walled tubular spray element having concentric wall sections that are movable relative to one another to selectively activate one or more apertures and thereby modify a spray pattern emitted by the tubular spray element. In other instances, multiple selectable spray patterns may be supported through the use of a multi-chamber tubular spray element in which different sets of apertures are in fluid communication with different internal chambers in the tubular spray element and flow is selectively controlled to one or more of the chambers.
A tubular spray element, in this regard, may be considered to be a type of rotatable conduit that includes a body capable of communicating a fluid such as water, a wash fluid including water, detergent and/or another treatment composition, or pressurized air, and that is capable of communicating the fluid to one or more apertures or nozzles to spray fluid onto utensils within a wash tub. A tubular spray element generally includes an elongated body, which may be generally cylindrical in some embodiments but may also have other cross-sectional profiles in other embodiments, and which has one or more apertures disposed on an exterior surface thereof and in fluid communication with a fluid supply, e.g., through one or more internal passageways defined therein. A tubular spray element also has a longitudinal axis generally defined along its longest dimension and about which the tubular spray element rotates. Further, when a tubular spray element is mounted on a rack and configured to selectively engage with a dock based upon the position of the rack, this longitudinal axis may also be considered to be an axis of insertion. A tubular spray element may also have a cross-sectional profile that varies along the longitudinal axis, so it will be appreciated that a tubular spray element need not have a circular cross-sectional profile along its length as is illustrated in a number embodiments herein. In addition, the one or more apertures on the exterior surface of a tubular spray element may be arranged into nozzles in some embodiments, and may be fixed or movable (e.g., rotating, oscillating, etc.) with respect to other apertures on the tubular spray element. Further, the exterior surface of a tubular spray element may be defined on multiple components of a tubular spray element, i.e., the exterior surface need not be formed by a single integral component.
In addition, in some embodiments a tubular spray element may be discretely directed by a tubular spray element drive to multiple rotational positions about the longitudinal axis to spray a fluid in predetermined directions into a wash tub of a dishwasher during a wash cycle. In some embodiments, the tubular spray element may be operably coupled to such a drive through a support arrangement that both rotates the tubular spray element and supplies fluid to the tubular spray element, as will become more apparent below. Further details regarding tubular spray elements may be found, for example, in U.S. Pat. No. 10,531,781 to Digman et al., which is assigned to the same assignee as that of the present application, and which is incorporated by reference herein. In other embodiments, however, a tubular spray element may rotate in a less controlled fashion, e.g., through the use of an electric drive, a hydraulic drive, or based upon a force generated in reaction to the ejection of wash fluid from the tubular spray element itself. In such instances, the rotational position of a tubular spray element may not be discretely controlled and/or known at any given time, although other aspects of the rotation or operation of the tubular spray element may still be controlled in some embodiments, e.g., the speed of rotation, whether rotation is enabled or disabled, and/or whether fluid flow is provided to the tubular spray element, etc.
Turning now to the drawings, wherein like numbers denote like parts throughout the several views,
In addition, consistent with some embodiments of the invention, dishwasher 10 may include one or more tubular spray elements (TSEs) 26 to direct a wash fluid onto utensils disposed in racks 18, 20. As will become more apparent below, tubular spray elements 26 are rotatable about respective longitudinal axes and are discretely directable by one or more tubular spray element drives (not shown in
Some tubular spray elements 26 may be fixedly mounted to a wall or other structure in wash tub 16, e.g., as may be the case for tubular spray elements 26 disposed below or adjacent lower rack 18. For other tubular spray elements 26, e.g., rack-mounted tubular spray elements, the tubular spray elements may be removably coupled to a docking arrangement such as docking arrangement 28 mounted to the rear wall of wash tub 16 in
The embodiments discussed hereinafter will focus on the implementation of the hereinafter-described techniques within a hinged-door dishwasher. However, it will be appreciated that the herein-described techniques may also be used in connection with other types of dishwashers in some embodiments. For example, the herein-described techniques may be used in commercial applications in some embodiments. Moreover, at least some of the herein-described techniques may be used in connection with other dishwasher configurations, including dishwashers utilizing sliding drawers or dish sink dishwashers, e.g., a dishwasher integrated into a sink.
Now turning to
As shown in
In the illustrated embodiment, pump 36 and air supply 38 collectively implement a fluid supply for dishwasher 100, providing both a source of wash fluid and pressurized air for use respectively during wash and drying operations of a wash cycle. A wash fluid may be considered to be a fluid, generally a liquid, incorporating at least water, and in some instances, additional components such as detergent, rinse aid, and other additives. During a rinse operation, for example, the wash fluid may include only water. A wash fluid may also include steam in some instances. Pressurized air is generally used in drying operations, and may or may not be heated and/or dehumidified prior to spraying into a wash tub. It will be appreciated, however, that pressurized air may not be used for drying purposes in some embodiments, so air supply 38 may be omitted in some instances. Moreover, in some instances, tubular spray elements may be used solely for spraying wash fluid or spraying pressurized air, with other sprayers or spray arms used for other purposes, so the invention is not limited to the use of tubular spray elements for spraying both wash fluid and pressurized air.
Controller 30 may also be coupled to a dispenser 44 to trigger the dispensing of detergent and/or rinse agent into the wash tub at appropriate points during a wash cycle. Additional sensors and actuators may also be used in some embodiments, including a temperature sensor 46 to determine a wash fluid temperature, a door switch 48 to determine when door 12 is latched, and a door lock 50 to prevent the door from being opened during a wash cycle. Moreover, controller 30 may be coupled to a user interface 52 including various input/output devices such as knobs, dials, sliders, switches, buttons, lights, textual and/or graphics displays, touch screen displays, speakers, image capture devices, microphones, etc. for receiving input from and communicating with a user. In some embodiments, controller 30 may also be coupled to one or more network interfaces 54, e.g., for interfacing with external devices via wired and/or wireless networks such as Ethernet, Bluetooth, NFC, cellular and other suitable networks. Additional components may also be interfaced with controller 30, as will be appreciated by those of ordinary skill having the benefit of the instant disclosure. For example, one or more tubular spray element (TSE) drives 56 and/or one or more tubular spray element (TSE) valves 58 may be provided in some embodiments to discretely control one or more tubular spray elements disposed in dishwasher 10, as will be discussed in greater detail below.
It will be appreciated that each tubular spray element drive 56 may also provide feedback to controller 30 in some embodiments, e.g., a current position and/or speed, although in other embodiments a separate position sensor may be used. In addition, as will become more apparent below, flow regulation to a tubular spray element may be performed without the use of a separately-controlled tubular spray element valve 58 in some embodiments, e.g., where rotation of a tubular spray element by a tubular spray element drive is used to actuate a mechanical valve.
Moreover, in some embodiments, at least a portion of controller 30 may be implemented externally from a dishwasher, e.g., within a mobile device, a cloud computing environment, etc., such that at least a portion of the functionality described herein is implemented within the portion of the controller that is externally implemented. In some embodiments, controller 30 may operate under the control of an operating system and may execute or otherwise rely upon various computer software applications, components, programs, objects, modules, data structures, etc. In addition, controller 30 may also incorporate hardware logic to implement some or all of the functionality disclosed herein. Further, in some embodiments, the sequences of operations performed by controller 30 to implement the embodiments disclosed herein may be implemented using program code including one or more instructions that are resident at various times in various memory and storage devices, and that, when read and executed by one or more hardware-based processors, perform the operations embodying desired functionality. Moreover, in some embodiments, such program code may be distributed as a program product in a variety of forms, and that the invention applies equally regardless of the particular type of computer readable media used to actually carry out the distribution, including, for example, non-transitory computer readable storage media. In addition, it will be appreciated that the various operations described herein may be combined, split, reordered, reversed, varied, omitted, parallelized and/or supplemented with other techniques known in the art, and therefore, the invention is not limited to the particular sequences of operations described herein.
Numerous variations and modifications to the dishwasher illustrated in
Now turning to
Moreover, as illustrated in
Tubular spray element 100 is in fluid communication with a fluid supply 106, e.g., through a port 108 of tubular spray element drive 102, to direct fluid from the fluid supply into the wash tub through the one or more apertures 104. Tubular spray element drive 102 is coupled to tubular spray element 100 and is configured to discretely direct the tubular spray element 100 to each of a plurality of rotational positions about longitudinal axis L. By “discretely directing,” what is meant is that tubular spray element drive 102 is capable of rotating tubular spray element 100 generally to a controlled rotational angle (or at least within a range of rotational angles) about longitudinal axis L. Thus, rather than uncontrollably rotating tubular spray element 100 or uncontrollably oscillating the tubular spray element between two fixed rotational positions, tubular spray element drive 102 is capable of intelligently focusing the spray from tubular spray element 100 between multiple rotational positions. It will also be appreciated that rotating a tubular spray element to a controlled rotational angle may refer to an absolute rotational angle (e.g., about 10 degrees from a home position) or may refer to a relative rotational angle (e.g., about 10 degrees from the current position).
Tubular spray element drive 102 is also illustrated with an electrical connection 110 for coupling to a controller 112, and a housing 114 is illustrated for housing various components in tubular spray element drive 102 that will be discussed in greater detail below. In the illustrated embodiment, tubular spray element drive 102 is configured as a base that supports, through a rotary coupling, an end of the tubular spray element and effectively places the tubular spray element in fluid communication with port 108.
By having an intelligent control provided by tubular spray element drive 102 and/or controller 112, spray patterns and cycle parameters may be increased and optimized for different situations. For instance, tubular spray elements near the center of a wash tub may be configured to rotate 360 degrees, while tubular spray elements located near wash tub walls may be limited to about 180 degrees of rotation to avoid spraying directly onto any of the walls of the wash tub, which can be a significant source of noise in a dishwasher. In another instance, it may be desirable to direct or focus a tubular spray element to a fixed rotational position or over a small range of rotational positions (e.g., about 5-10 degrees) to provide concentrated spray of liquid, steam and/or air, e.g., for cleaning silverware or baked on debris in a pan. In addition, in some instances the rotational velocity of a tubular spray element could be varied throughout rotation to provide longer durations in certain ranges of rotational positions and thus provide more concentrated washing in particular areas of a wash tub, while still maintaining rotation through 360 degrees. Control over a tubular spray element may include control over rotational position, speed or rate of rotation and/or direction of rotation in different embodiments of the invention.
In addition, an optional position sensor 122 may be disposed in tubular spray element drive 102 to determine a rotational position of tubular spray element 100 about axis L. Position sensor 122 may be an encoder or hall sensor in some embodiments, or may be implemented in other manners, e.g., integrated into a stepper motor, whereby the rotational position of the motor is used to determine the rotational position of the tubular spray element. Position sensor 122 may also sense only limited rotational positions about axis L (e.g., a home position, 30 or 45 degree increments, etc.). Further, in some embodiments, rotational position may be controlled using time and programming logic, e.g., relative to a home position, and in some instances without feedback from a motor or position sensor. Position sensor 122 may also be external to tubular spray element drive 102 in some embodiments.
An internal passage 124 in tubular spray element 100 is in fluid communication with an internal passage 126 leading to port 108 (not shown in
Turning to
In some embodiments, valve 140 may be actuated independent of rotation of tubular spray element 144, e.g., using an iris valve, butterfly valve, gate valve, plunger valve, piston valve, valve with a rotatable disc, ball valve, etc., and actuated by a solenoid, motor or other separate mechanism from the mechanism that rotates tubular spray element 144. In other embodiments, however, valve 140 may be actuated through rotation of tubular spray element 144. In some embodiments, for example, rotation of tubular spray element 144 to a predetermined rotational position may close valve 140, e.g., where valve 140 includes an arcuate channel that permits fluid flow over only a range of rotational positions. In other embodiments, a valve may be actuated through over-rotation of a tubular spray element, or through counter rotation of a tubular spray element. Further, in some embodiments, a valve may be variable, e.g., configured as an iris valve, to regulate fluid flow to the tubular spray element, and may be independently actuated from rotation of a tubular spray element in some embodiments (e.g., via a solenoid or motor), or may be actuated through rotation of a tubular spray element, e.g., through rotation to a predetermined position, an over-rotation, or a counter-rotation, using appropriate mechanical linkages. Other variations will be appreciated by those of ordinary skill having the benefit of the instant disclosure.
Now turning to
Moreover, as illustrated by tubular spray element 150 of
In still other embodiments, a tubular spray element may be rack-mounted.
As an alternative, and as illustrated in
In some embodiments, tubular spray elements 196, 198 by themselves may provide sufficient washing action and coverage. In other embodiments, however, additional tubular spray elements, e.g., tubular spray elements 199 supported above upper rack 192 on one or both of the top and back walls of wash tub 190, may also be used. In addition, in some embodiments, additional spray arms and/or other sprayers may be used. It will also be appreciated that while 10 tubular spray elements are illustrated in
It will also be appreciated that in some embodiments, multiple tubular spray elements may be driven by the same tubular spray element drive, e.g., using geared arrangements, belt drives, or other mechanical couplings. Further, tubular spray elements may also be movable in various directions in addition to rotating about their longitudinal axes, e.g., to move transversely to a longitudinally axis, to rotate about an axis of rotation that is transverse to a longitudinal axis, etc. In addition, deflectors may be used in combination with tubular spray elements in some embodiments to further the spread of fluid and/or prevent fluid from hitting tub walls. In some embodiments, deflectors may be integrated into a rack, while in other embodiments, deflectors may be mounted to a wall of the wash tub. In addition, deflectors may also be movable in some embodiments, e.g., to redirect fluid between multiple directions. Moreover, while in some embodiments tubular spray elements may be used solely to spray wash fluid, in other embodiments tubular spray elements may be used to spray pressurized air at utensils during a drying operation of a wash cycle, e.g., to blow off water that pools on cups and dishes after rinsing is complete. In some instances, different tubular spray elements may be used to spray wash fluid and spray pressurized air, while in other instances the same tubular spray elements may be used to alternately or concurrently spray wash liquid and pressurized air.
In some embodiments consistent with the invention, a tubular spray element may support multiple spray patterns that differ from one another, and that direct wash fluid from different subsets of apertures in the tubular spray element. An aperture, in this regard, may be considered to be any passageway through a structure that allows for fluid flow, and as will become more apparent below, in some embodiments some apertures may be internal to a tubular spray element such that they may be selectively aligned with other apertures in an exterior surface of the tubular spray element to allow for fluid flow from an internal passageway of the tubular spray element and out of the aligned apertures to direct a spray of wash fluid into the wash tub of a dishwasher, e.g., to spray wash fluid onto one or more utensils disposed within the wash tub. Apertures may be configured as holes or voids in some embodiments, while in other embodiments apertures may include structures used to control the direction, velocity, volume and/or dispersion of fluid, e.g., to provide different types of sprays such as jets, streams, soaks, mists, etc. Furthermore, combinations of apertures may be used to provide various spray patterns such as focused or narrow sprays, wide or dispersed sprays, as well as spray patterns that focus on particular regions of a wash tub (e.g., to provide high pressure washing of heavily soiled utensils, to wash silverware in a silverware basket, to flood glassware with clean water at the end of a cycle to minimize spotting, etc.). Apertures may also be associated with additional structures such as fluidic nozzles, rotating nozzles, oscillating nozzles, etc. in some embodiments.
Turning to
As shown in
With further reference to
Control over the relative rotation between wall sections 216, 218 may be provided in a number of manners consistent with the invention. In some embodiments, for example, a separate rotational drive may be used to generate the relative rotation, and in some embodiments, various catches, ratcheting mechanisms and/or biasing mechanisms may be used to index the wall sections between different positions.
In the illustrated embodiment, however, such relative movement may be implemented in part through the use of rotational limits that allow for some rotational movement between the wall sections, but that limit relative rotation beyond those limits. By doing so, selection of different spray patterns may be implemented by changing the direction of rotation of the tubular spray element, such that clockwise rotation of the tubular spray element generates one spray pattern and counter-clockwise rotation generates a different spray pattern. As illustrated in
Rotational limits may be implemented, for example, as illustrated in
If it is desirable to utilize a second spray pattern, the rotational direction of outer wall section 216 may be reversed, and as illustrated in
Various modifications may be used in different embodiments. For example, more than two subsets of apertures, positions and/or spray patterns may be supported in some embodiments. In addition, in some embodiments, some apertures may span an arc of rotational positions such that fluid flow is maintained when moving between different positions. In one example embodiment, it may be desirable to support narrow and wide spray patterns, and use arcuate apertures that allow for fluid flow in multiple positions for one or more center sprays while having apertures that only allow for fluid flow in one position for one or more end sprays.
Furthermore, as illustrated in
In addition, while the aforementioned embodiments incorporate wall sections that are tubular in shape and thus fully circumscribe the longitudinal axis of the tubular spray element, in other embodiments, the inner or outer wall section may be configured to circumscribe only a portion of the longitudinal axis.
Other modifications and variations of a multi-walled tubular spray element will be appreciated by those of ordinary skill having the benefit of the instant disclosure, so the invention is not limited to the particular embodiments discussed herein.
Now turning to
Two sets of apertures, apertures 310 and apertures 312, are disposed in main body 302 and are respectively in fluid communication with chambers 306, 308 and circumferentially offset from one another. A supply manifold 314 includes an inlet 316 in fluid communication with a fluid supply (not shown in
Supply manifold 314 further includes a diverter valve 322, implemented in the illustrated embodiment as an internal wall that faces internal divider 304, and that restricts fluid flow to whichever of the internal chambers 306, 308 for which its associated inlet 318, 320 faces the internal wall, while allowing fluid flow to the other internal chamber through its associated inlet 318, 320.
As noted above, both main body 302 and internal divider 304 rotate together, and as such, when in the position illustrated in
In other embodiments, and as illustrated by tubular spray element 330 of
In this embodiment, main body 332 rotates relative to internal partition 334, and moreover, internal partition 334 is maintained at a fixed rotational position relative to diverter valve 352 such that fluid flow through inlet 348 and into internal chamber 336 is always permitted while fluid flow to internal chamber 338 is always restricted. Thus, in this embodiment, as main body 332 rotates, apertures 340, 342 will align with each of internal chambers 336, 338 at different rotational positions. It will be appreciated that in other embodiments, internal partition 334 may also rotate relative to diverter valve 352, such that control over fluid flow to each internal chamber may be controlled independently of the rotation of the tubular spray element, thereby providing control over spray patterns independent of rotation.
Further, while the embodiments of
It will also be appreciated that in some embodiments, multiple sets of apertures may be active at any given time, e.g., such that one spray pattern supports fluid flow in multiple angular directions. Likewise, sets or subsets of apertures are not required to be axially aligned with one another as illustrated in a number of the embodiments, e.g., so that spray may be emitted in multiple directions by different apertures in the same set or subset.
Next, turning to
The tubular spray element spray pattern selector 386 may be implemented in any of the various manners discussed above, although it will be appreciated by those of ordinary skill having the benefit of the instant disclosure that other mechanisms may be used to select between different spray patterns in other embodiments.
Other modifications may be made to the illustrated embodiments without departing from the spirit and scope of the invention. Therefore, the invention lies in the claims hereinafter appended.
| Number | Name | Date | Kind |
|---|---|---|---|
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