Patent Application
20160115970
The present subject matter relates generally to an impeller assembly for appliances, such as dryer appliances.
Dryer appliances generally include a cabinet with a drum rotatably mounted therein. A motor can selectively rotate the drum during operation of the dryer appliance, e.g., to tumble articles located within a chamber defined by the drum. Dryer appliances also generally include a heater assembly that passes heated air through the chamber of the drum in order to dry moisture laden articles disposed within the chamber.
To circulate heated air, certain dryer appliances include an impeller assembly, the impeller assembly including an impeller positioned within a housing. During operation of the dryer appliance, the impeller urges a flow of heated air into the chamber of the drum. Such heated air absorbs moisture from articles disposed within the chamber. The impeller also urges moisture laden air out of the chamber through a vent. The vent can be connected to household ductwork that directs the moisture laden air outdoors.
Conventionally, impellers include a plurality of blades mounted to a hub. However, the arrangement of blades may result in a spike in a sound power level due to a consistent frequency at which the plurality of blades pass a cut-off edge defined between a volute and a transition member of the housing.
Accordingly, an impeller assembly for a dryer appliance with features for reducing a spike in sound power level during operation of the impeller assembly would be beneficial. More particularly, an impeller assembly with one or more features for disrupting the frequency at which the plurality of blades pass the cut-off edge during operation of the impeller assembly would be particularly useful.
Aspects and advantages of the invention will be set forth in part in the following description, or may be apparent from the description, or may be learned through practice of the invention.
In a first exemplary embodiment, a dryer appliance is provided. The dryer appliance includes a cabinet, a motor positioned within the cabinet, and a housing positioned within the cabinet. The housing including a volute and a transition member. The dryer appliance also includes an impeller defining an axial direction, a radial direction, and a circumferential direction. The impeller is rotatable about the axial direction and is positioned within the volute of the housing. The impeller is in mechanical communication with the motor and is rotatable with the motor in order to urge a flow of air from the volute to the transition member. The impeller includes a hub and a plurality of blades, the hub positioned at a center of the impeller and the plurality of blades spaced about the hub along the circumferential direction. The plurality of blades include a first pair of blades and a second pair of blades. The first pair of blades defines a first gap along the circumferential direction at a radially outer portion and the second pair of blades defines a second gap along the circumferential direction at a radially outer portion. The first gap is unequal to the second gap.
In a second exemplary embodiment, an impeller assembly for a dryer appliance is provided. The impeller assembly includes a housing including a volute and a transition member. The housing is configured to be positioned in a cabinet of the dryer appliance. The impeller assembly also includes an impeller defining an axial direction and a circumferential direction. The impeller is rotatable about the axial direction and is positioned within the volute of the housing. The impeller is configured to urge a flow of air from the volute to the transition member. The impeller includes a hub and a plurality of blades, the hub positioned at a center of the impeller and the plurality of blades spaced about the hub along the circumferential direction. Each of the plurality of blades defines an outer tip, and each outer tip defines a gap having a gap length with an adjacent outer tip. The gap lengths of consecutive gaps are unequal, and the gap lengths of a plurality of consecutive gaps are repeated sequentially.
These and other features, aspects and advantages of the present invention 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 of the present invention, 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.
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.
As used herein, the term “article” may refer to but need not be limited to fabrics, textiles, garments (or clothing), and linens. Furthermore, the term “load” or “laundry load” refers to the combination of articles that may be washed together in a washing machine or dried together in a laundry dryer (i.e., a clothes dryer) and may include a mixture of different or similar articles of different or similar types and kinds of fabrics, textiles, garments and linens within a particular laundering process.
Dryer appliance 10 includes a cabinet 12 having a front panel 14, a rear panel 16, a pair of side panels 18 and 20 spaced apart from each other by front and rear panels 14 and 16, a bottom panel 22, and a top cover 24. Within cabinet 12 is a drum or container 26 mounted for rotation about a substantially horizontal axis. Drum 26 is generally cylindrical in shape and defines a chamber 27 for receipt of articles for drying.
Drum 26 also defines an opening 29 for permitting access to the chamber 27 of drum 26. Opening 29 of drum 26, e.g., permits loading and unloading of clothing articles and other fabrics from chamber 27 of drum 26. A door 33 is rotatably mounted at opening 29 and selectively hinders access to chamber 27 of drum 26 through opening 29.
Drum 26 includes a rear wall 25 rotatably supported within cabinet 12 by a suitable fixed bearing. Rear wall 25 can be fixed or can be rotatable. A motor 28 rotates the drum 26 about the horizontal axis through a pulley 30 and a belt 31. Motor 28 is also in mechanical communication with a fan or air handler 42 such that motor 28 rotates an impeller 43, e.g., a centrifugal impeller, of air handler 42. Air handler 42 is configured for drawing air through chamber 27 of drum 26, e.g., in order to dry articles located therein as discussed in greater detail below. In alternative exemplary embodiments, dryer appliance 10 may include an additional motor (not shown) for rotating impeller 43 of air handler 42 independently of drum 26.
Drum 26 is configured to receive heated air that has been heated by a heater assembly 34, e.g., in order to dry damp articles disposed within chamber 27 of drum 26. Heater assembly 34 includes a combustion chamber 36. As discussed above, during operation of dryer appliance 10, motor 28 rotates drum 26 and impeller 43 of air handler 42 such that air handler 42 draws air through chamber 27 of drum 26 when motor 28 rotates impeller 43. In particular, ambient air, shown with arrow Aa, enters combustion chamber 36 via an inlet 38 due to air handler 42 urging such ambient air Aa into inlet 38. Such ambient air Aa is heated within combustion chamber 36 and exits combustion chamber 36 as heated air, shown with arrow Ah. Air handler 42 draws such heated air Ah through a back duct 40 to drum 26. The heated air Ah enters drum 26 through a plurality of holes 32 defined in rear wall 25 of drum 26.
Within chamber 27, the heated air Ah can accumulate moisture, e.g., from damp articles disposed within chamber 27. In turn, air handler 42 draws moisture laden air, shown as arrow Am, through a screen filter 44 which traps lint particles. Such moisture laden air Am then enters a front duct 46 and is passed through air handler 42 to an exhaust duct 48. From exhaust duct 48, such moisture laden air Am passes out of clothes dryer 10 through a vent 49 defined by cabinet 12.
Front duct 46 and exhaust duct 48 form a conduit 47 that extends between and connects chamber 27 of drum 26 and vent 49. Conduit 47 places chamber 27 of drum 26 and vent 49 in fluid communication in order to permit moisture laden air Am to exit dryer appliance 10. Air handler 42 is in fluid communication with conduit 47, and impeller 43 of air handler 42 is positioned within conduit 47.
A cycle selector knob 50 is mounted on a cabinet backsplash 52 and is in communication with a controller 54. Signals generated in controller 54 operate motor 28 and heater assembly 34 in response to a position of selector knob 50. Alternatively, a touch screen type interface may be provided. As used herein, “processing device” or “controller” may refer to one or more microprocessors or semiconductor devices and is not restricted necessarily to a single element. The processing device can be programmed to operate dryer appliance 10. The processing device may include, or be associated with, one or memory elements such as e.g., electrically erasable, programmable read only memory (EEPROM).
Referring now to
Impeller assembly 100 may be used in any suitable dryer appliance. For example, impeller assembly 100 may be used in dryer appliance 10, e.g., as air handler 42 (
Impeller assembly 100 includes a housing 102 and an impeller 104, impeller 104 defining an axial direction A, a radial direction R, and a circumferential direction C (
As will be discussed in greater detail below with reference to
Impeller assembly 100 additionally includes a cover plate 118 (
As may be more clearly seen in
Generally, clearance 128 can be sized to reduce an amount of sound generated by impeller assembly 100 during operation. More particularly, clearance 128 can be increased to reduce an amount of sound generated by outer tips 116 of blades 114 passing by cut-off edge 126. However, such a configuration may reduce an efficiency of impeller assembly 100. As will be described below with reference to
Referring now to
For the exemplary embodiment depicted, impeller 104 includes at least a portion of the plurality of blades 114 unevenly spaced about hub 112 along circumferential direction C. For example, impeller 104 of
Moreover, for the embodiment depicted in
In certain exemplary embodiments, a plurality of consecutive gap lengths L may be repeated sequentially about hub 112. For example, the gap lengths L of two consecutive gaps 130 may be repeated sequentially about hub 112. In such an exemplary embodiment, consecutive gaps 130 may define the following gap lengths L: LE, LF, LE, LF, LE, LF, etc. Alternatively, however, the gap lengths L of four consecutive gaps 130 may be repeated sequentially about hub 112. In such an exemplary embodiment, consecutive gaps 130 may define the following gap lengths L: LE, LF, LG, LH, LE, LF, LG, LH, etc. In still other exemplary embodiments, however, the gap lengths L of any other suitable number of consecutive gaps 130 may be sequentially repeated about hub 112. By contrast, however, in still other exemplary embodiments, each gap 130 may define a gap length L unequal to the gap length L of every other gap 130 defined by adjacent blades 116 of impeller 104.
Referring still to
It should be appreciated, however, that in other exemplary embodiments of the present disclosure, the lengths 132 of the plurality of blades 116 may not all be equal. Additionally, in other exemplary embodiments, the pitches 134 of the plurality of blades 116 may also not all be equal. For example, the pitches 134 of the plurality of blades 116 may be varied to achieve the uneven spacing of blades 114 at outer tips 116.
An impeller 104 in accordance with the present disclosure may reduce a spike in sound power level during operation of the impeller assembly 100. Such is achieved by disrupting the frequency at which outer tips 116 of the plurality of blades 114 pass by cut-off edge 126 of housing 102. By disrupting the frequency at which outer tips 116 the plurality of blades 114 pass by cut-off edge 126 of housing 102, the harmonic tones, i.e., the sound amplitude, may be reduced. Accordingly, such a configuration may allow for a quieter impeller assembly 100 for, e.g., dryer appliance 10. Additionally, such a configuration may allow for a more efficient impeller assembly 100 for, e.g., dryer appliance 10 by allowing for a decreased clearance 128 between outer tips 116 of the plurality of blades 114 and cut-off edge 126 of the housing 102 while still producing an acceptable amount of noise.
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.
