MULTIFUNCTIONAL ROD FOR ICEMAKER
An apparatus includes a mold body with at least one cavity configured and dimensioned to receive water to be frozen into ice; and a rod, the rod in turn comprising at least one of a heat source and a heat sink. The mold body is mounted to the rod such that the rod functions as an axis of rotation for the mold body. A refrigerator using the apparatus is also disclosed.
This application is related to U.S. patent application Ser. No. ______, filed on ______, Attorney Docket Number 236952, entitled ICEMAKER WITH REVERSIBLE THERMOSIPHON, the complete disclosure of which is expressly incorporated herein by reference in its entirety for all purposes.
BACKGROUND OF THE INVENTIONThe subject matter disclosed herein relates to refrigeration, and more particularly to icemakers and the like.
It is now common practice in the art of refrigerators to provide an automatic icemaker. The icemaker is often disposed in the freezer compartment and ice is often dispensed through an opening in the access door of the freezer compartment. In this arrangement, ice is formed by freezing water with cold air in the freezer compartment.
BRIEF DESCRIPTION OF THE INVENTIONAs described herein, the exemplary embodiments of the present invention overcome one or more disadvantages known in the art.
One aspect of the present invention relates to an apparatus comprising: a mold body with at least one cavity configured and dimensioned to receive water to be frozen into ice; and a rod, the rod in turn comprising at least one of a heat source and a heat sink, the mold body being mounted to the rod such that the rod functions as an axis of rotation for the mold body.
Another aspect relates to a refrigerator comprising: a body defining at least one cooled compartment; a door hinged to the body and permitting access to the at least one cooled compartment; a mold body with at least one cavity configured and dimensioned to receive water to be frozen into ice; a rod, mounted to at least one of the body and the door, the rod in turn comprising at least one of a heat source and a heat sink, the mold body being mounted to the rod such that the rod functions as an axis of rotation for the mold body, at least one of the body and the door having a region for receiving discharge of the ice from the mold body.
These and other aspects and advantages of the present invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims. Moreover, the drawings are not necessarily drawn to scale and, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
In the drawings:
Reference should initially be had to
The freezer compartment 108 and the fresh food compartment 106 are arranged in a side-by-side configuration where the freezer compartment 108 is disposed next to the fresh food compartment 106. The doors closing the fresh food and freezer compartments are omitted in
The fresh food compartment 106 and the freezer compartment 108 are, in a well-known manner, contained within a main body including an outer case, which can be formed by folding a sheet of a suitable material, such as pre-painted steel, into a generally inverted U-shape to form a top and two sidewalls of the outer case. The outer case also has a bottom which connects the two sidewalls to each other at the bottom edges thereof, and a back. A mullion or divider 112 connects the top and bottom to each other and separates the fresh food compartment 106 from the freezer compartment 108. As is known in the art, a thermally insulating liner is affixed to the outer case.
As illustrated in
Water is provided to the mold body 104 through a water supply conduit (not shown but per se familiar to the skilled artisan), and then is frozen into ice cubes. Then the ice cubes are usually discharged from the mold body 104 and stored in the ice storage hopper 114 until needed by a user. In
The freezer compartment 108 and the fresh food compartment 106 are arranged in a configuration where the freezer compartment 108 is disposed beneath the fresh food compartment 106. The doors closing the fresh food and freezer compartments are omitted in
The fresh food compartment 106 and the freezer compartment 108 are, in a well-known manner, contained within a main body constructed in a well-known manner, similar to that described above. A mullion or divider 112 connects the sides to each other and separates the fresh food compartment 106 from the freezer compartment 108. As is known in the art, a thermally insulating liner is affixed to the outer case.
As illustrated in
Reference should now be had to
In some instances, mold body 104 is fixed to rod 102 and rotates therewith when driven by motor 146 and suitable gearing 148 or the like. As best seen in
Thus, in one or more embodiments, ice mold 104 is made of a conductive material, secured mechanically and thermally to rod 102 which functions as an axis of rotation. Rod 102 is a hollow sealed pipe with refrigerant inside; it acts as thermosiphon or reflux boiler; i.e., a heat pipe which can but need not have a wicking structure because the evaporator is below the condenser. In addition, one end of rod 102 has a heater 144 on it and the other end is the condenser 141 of the heat pipe and has fins 140. The condenser end is angled up in the fill and freeze mode as seen in the view of
Note that
A conventional motor 146 has reduction gear 148 and a controller 197 to cause it to actuate just enough to rotate the mold body 104.
Any suitable heater 144 can be employed. The heater can also be controlled by the controller 197. One non-limiting example of a suitable heater is the CALROD® line of resistance heating elements available from General Electric Company, Appliance Park, Louisville, Ky. 40225 USA. Where the rod 102 is fixed, the heater element 144 can be wrapped around the rod and heat is conducted through a thermal contact interface (the same could be augmented, for example, by soldering, brazing, use of thermally conductive grease or Indium foil, or the like). Where rod 102 rotates, the heater element 144 may, for example, be coiled around rod 102 with good thermal contact but sufficiently free to rotate. In this latter case, thermally conductive grease and/or a journal bearing can be employed, for example. Where mold 104 rotates with rod 102, the two can be brazed, soldered, or in tight mechanical contact, so that heat is conducted easily through the mechanical fingers 150 seen in the drawings. Rod 102 may be mounted on bearings 199. Where the mold 104 rotates about the rod 102, with rod 102 stationary, journal bearings could be employed between the rod and mold body, optionally with thermal grease, or fingers 150 can form bearing surfaces against rod 102, again optionally with thermal grease.
From a purely thermal standpoint, a presently preferred embodiment is one, to be discussed below, wherein mold 104 is hollow and contains working fluid in communication with the cavity of rod 102; the mold 104 thus itself forms the evaporator of the thermosiphon. In a thermal sense, the next best approach is the case where the mold body 104 is fixed to the rod 102 and both rotate together, as in
Note that when in heat and dispense mode, in the embodiment of
Reference should now be had to
It will thus be appreciated, with reference again to
It should be noted that in some instances, the mold body is filled and freezing occurs in an upright position, then the mold body is inverted and heat is applied to aid discharge. However, heat can be applied at different times. For example, in some cases, the mold body is filled and freezing occurs in an upright position, then heat is applied to aid discharge, and finally the mold body is inverted. For example, consider
One advantage that may be realized in the practice of some embodiments of the described systems and techniques is more rapid ice production. Another advantage that may be realized in the practice of some embodiments of the described systems and techniques is a simple, robust, and low cost design (the components needed to make ice include a fixed (or rotating) rod, mold body, gear, and step motor.). Still another advantage that may be realized in the practice of some embodiments of the described systems and techniques is production of ice cubes with unique shapes, such as hemispheres, three-dimensional trapezoids, hollow cylinders, and the like. Yet another advantage that may be realized in the practice of some embodiments of the described systems and techniques is that less internal refrigerator volume is taken up by the icemaker (since one or more embodiments allow more rapid freezing of ice—say, on the order of ten times faster than conventional techniques—more rapid dispensing can be achieved, thus allowing production of a desired volume of ice per unit time with a smaller mold volume; furthermore, in at least some instances, rotation of the mold body overcomes the need for a large rotating rack).
It will thus be appreciated that in one or more embodiments, a fixed multifunctional rod provides the icemaker mold body with an axis of rotation, as well as a heat source and/or heat extraction for rapid chill of ice. Possible fixed rods includes a heat pipe, thermosiphon, or reflux boiler with fins on one side (to extract heat from the mold body) and a CALROD® or other heater looped around or otherwise in thermal communication with the heat pipe, thermosiphon, or reflux boiler on the other side (the same applies heat to the mold body for ice release), or a CALROD® or other heater (which only applies heat to mold body). The bottom of the mold body is attached to and rotates around the fixed rod or with a rotating rod. A large gear attached to one side of the mold body, and a step motor, rotate the mold body.
Given the teachings herein, the skilled artisan will be able to select working fluids and determine an appropriate charge of the selected working fluid. Further useful details are provided in the aforesaid U.S. patent application Ser. No. ______, filed on even date herewith, attorney docket number 236952, entitled ICEMAKER WITH REVERSIBLE THERMOSIPHON.
Given the discussion thus far, it will be appreciated that, in general terms, an exemplary apparatus, according to one aspect of the invention, includes a mold body 104, 104′ with at least one cavity configured and dimensioned to receive water to be frozen into ice, as well as a rod 102, 102′, 2202. The rod in turn includes at least one of a heat source 144 and a heat sink 141. The mold body is mounted to the rod such that the rod functions as an axis of rotation for the mold body (i.e., rod is fixed and mold body rotates about it or mold body and rod are fixed to each other and rotate as a unit).
In some instances, the rod 102, 102′ is hollow and sealed, the mold body 104, 104′ has first and second ends, and the rod has an evaporator portion 142 in thermal communication with the mold body 104, 104′. Further, the rod 102, 102′ has a condenser portion 141, comprising the heat sink, and extending past the second end of the mold body 104, 104′ and above the evaporator portion 142 when the mold body is disposed to receive the water. Furthermore, the apparatus can also include a two-phase heat transfer fluid contained within the hollow rod 102, 102′ and a heat transfer surface (e.g., fins 140) on the condenser portion 141.
In some instances, the apparatus further includes an actuation arrangement (e.g., motor 146 with gearing arrangement 148) which causes the mold body to rotate about the axis of rotation between a first position wherein the water can be introduced into the at least one cavity and a second position wherein the ice can be discharged from the at least one cavity.
In one or more embodiments, the rod further comprises a heater 144 in thermal communication with the evaporator portion 142, the heater comprising the heat source. Heater 144 may be in thermal communication with evaporator 142 by conduction from a distal end extending past the first side of the mold body (left side of rod in FIGS. 22, 27, and 28 with heater being in thermal contact with the distal end of the rod) or could even extend into the evaporator region.
In at least some instances, controller 197 is configured to cause the actuation arrangement to rotate the mold body about the axis of rotation/or to activate the heater (for example, when the mold body is in the second position and/or when the mold body is in the first position and about to rotate to the second position).
As shown, for example, in
As noted, in some cases, the mold body 104, 104′ and the rod 102, 102′ are fixed against relative rotation about the axis of rotation, in which case one or more bearings 199 can be provided, such that the rod and the mold body rotate as a unit about the axis of rotation. In another aspect as in
In a preferred but non-limiting approach, mold body 104 has a plurality of cavities 160 configured and dimensioned to receive the water to be frozen into the ice.
In a thermally preferred approach of
In some instances, as in
An actuation arrangement as described above (optionally with controller 197) can also be provided in this case.
Furthermore, given the discussion thus far, it will be appreciated that, in general terms, an exemplary refrigerator 100, 100′, according to still another aspect of the invention, includes a body defining at least one cooled compartment (e.g., 108, 134); a door such as 110 or 130 hinged to the body and permitting access to the at least one cooled compartment; and an apparatus as described above.
Software includes but is not limited to firmware, resident software, microcode, etc. As is known in the art, part or all of one or more aspects of the methods and apparatus discussed herein may be distributed as an article of manufacture that itself comprises a tangible computer readable recordable storage medium having computer readable code means embodied thereon. The computer readable program code means is operable, in conjunction with a computer system or microprocessor, to carry out all or some of the steps to perform the methods or create the apparatuses discussed herein. A computer-usable medium may, in general, be a recordable medium (e.g., floppy disks, hard drives, compact disks, EEPROMs, or memory cards) or may be a transmission medium (e.g., a network comprising fiber-optics, the world-wide web, cables, or a wireless channel using time-division multiple access, code-division multiple access, or other radio-frequency channel). Any medium known or developed that can store information suitable for use with a computer system may be used. The computer-readable code means is any mechanism for allowing a computer or processor to read instructions and data, such as magnetic variations on a magnetic medium or height variations on the surface of a compact disk. The medium can be distributed on multiple physical devices (or over multiple networks). As used herein, a tangible computer-readable recordable storage medium is intended to encompass a recordable medium, examples of which are set forth above, but is not intended to encompass a transmission medium or disembodied signal. A processor may include and/or be coupled to a suitable memory. A processor with suitable software and/or firmware instructions may be used to implement controller 197. Other types of controls, such as electromechanical controls, could also be used.
Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to exemplary embodiments thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. Moreover, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Furthermore, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.
Claims
1. An apparatus comprising:
- a mold body with at least one cavity configured and dimensioned to receive water to be frozen into ice; and
- a rod, said rod in turn comprising at least one of a heat source and a heat sink, said mold body being mounted to said rod such that said rod functions as an axis of rotation for said mold body.
2. The apparatus of claim 1, wherein:
- said rod is hollow and sealed;
- said mold body has first and second ends;
- said rod has an evaporator portion in thermal communication with said mold body; and
- said rod has a condenser portion, comprising said heat sink, and extending past said second end of said mold body and above said evaporator portion when said mold body is disposed to receive said water;
- further comprising:
- a two-phase heat transfer fluid contained within said hollow rod; and
- a heat transfer surface on said condenser portion.
3. The apparatus of claim 2, wherein said heat transfer surface comprises a plurality of fins.
4. The apparatus of claim 2, further comprising an actuation arrangement which causes said mold body to rotate about said axis of rotation between a first position wherein said water can be introduced into said at least one cavity and a second position wherein said ice can be discharged from said at least one cavity.
5. The apparatus of claim 4, wherein said rod further comprises a heater in thermal communication with said evaporator portion, said heater comprising said heat source.
6. The apparatus of claim 5, wherein said rod has a distal end, extending past said first side of said mold body, said heater being in thermal contact with said distal end of said rod.
7. The apparatus of claim 5, further comprising a controller configured to cause said actuation arrangement to rotate said mold body about said axis of rotation and to activate said heater under at least one of:
- a condition when said mold body is in said second position; and
- a condition when said mold body is in said first position and about to rotate to said second position.
8. The apparatus of claim 7, wherein said controller is configured to activate said heater at least under said condition when said mold body is in said first position and about to rotate to said second position, further comprising a secondary rack located to scoop said ice our of said mold body as said mold body rotates from said first position to said second position.
9. The apparatus of claim 5, wherein said mold body and said rod are fixed against relative rotation about said axis of rotation, further comprising at least one bearing, wherein said rod and said mold body rotate as a unit about said axis of rotation.
10. The apparatus of claim 5, wherein said rod is fixed and said mold body rotates about said rod.
11. The apparatus of claim 5, wherein said mold body has a plurality of cavities configured and dimensioned to receive said water to be frozen into said ice.
12. The apparatus of claim 2, wherein:
- said mold body is hollow and in fluid communication with said hollow rod, said two-phase heat transfer fluid extending into said hollow mold body, said evaporator portion of said rod being in said thermal communication with said mold body via said fluid communication.
13. The apparatus of claim 2, wherein:
- said evaporator portion of said rod is in said thermal communication with said mold body via conduction.
14. The apparatus of claim 1, wherein said rod further comprises a heater, said heater comprising said heat source.
15. The apparatus of claim 14, further comprising an actuation arrangement which causes said mold body to rotate about said axis of rotation between a first position wherein said water can be introduced into said at least one cavity and a second position wherein said ice can be discharged from said at least one cavity.
16. The apparatus of claim 15, further comprising a controller configured to cause said actuation arrangement to rotate said mold body about said axis of rotation and to activate said heater under at least one of:
- a condition when said mold body is in said second position; and
- a condition when said mold body is in said first position and about to rotate to said second position.
17. The apparatus of claim 16, wherein said controller is configured to activate said heater at least under said condition when said mold body is in said first position and about to rotate to said second position, further comprising a secondary rack located to scoop said ice our of said mold body as said mold body rotates from said first position to said second position.
18. A refrigerator comprising:
- a body defining at least one cooled compartment;
- a door hinged to said body and permitting access to said at least one cooled compartment;
- a mold body with at least one cavity configured and dimensioned to receive water to be frozen into ice;
- a rod, mounted to at least one of said body and said door, said rod in turn comprising at least one of a heat source and a heat sink, said mold body being mounted to said rod such that said rod functions as an axis of rotation for said mold body, at least one of said body and said door having a region for receiving discharge of said ice from said mold body.
19. The refrigerator of claim 18, wherein:
- said rod is hollow and sealed;
- said mold body has first and second ends;
- said rod has an evaporator portion in thermal communication with said mold body; and
- said rod has a condenser portion, comprising said heat sink, and extending past said second end of said mold body and above said evaporator portion when said mold body is disposed to receive said water, said condenser portion being in thermal communication with said at least one cooled compartment;
- further comprising:
- a two-phase heat transfer fluid contained within said hollow rod; and
- a heat transfer surface on said condenser portion.
20. The refrigerator of claim 19, further comprising an actuation arrangement which causes said mold body to rotate about said axis of rotation between a first position wherein said water can be introduced into said at least one cavity and a second position wherein said ice can be discharged from said at least one cavity.
21. The refrigerator of claim 20, wherein said rod further comprises a heater in thermal communication with said evaporator portion, said heater comprising said heat source.
22. The refrigerator of claim 21, further comprising a controller configured to cause said actuation arrangement to rotate said mold body about said axis of rotation and to activate said heater under at least one of:
- a condition when said mold body is in said second position; and
- a condition when said mold body is in said first position and about to rotate to said second position.
23. The refrigerator of claim 22, wherein said controller is configured to activate said heater at least under said condition when said mold body is in said first position and about to rotate to said second position, further comprising a secondary rack located to scoop said ice our of said mold body as said mold body rotates from said first position to said second position.
24. The refrigerator of claim 22, wherein said mold body has a plurality of cavities configured and dimensioned to receive said water to be frozen into said ice.
25. The refrigerator of claim 19, wherein:
- said mold body is hollow and in fluid communication with said hollow rod, said two-phase heat transfer fluid extending into said hollow mold body, said evaporator portion of said rod being in said thermal communication with said mold body via said fluid communication.
26. The refrigerator of claim 19, wherein:
- said evaporator portion of said rod is in said thermal communication with said mold body via conduction.
27. The refrigerator of claim 18, wherein said rod further comprises a heater, said heater comprising said heat source.
28. The apparatus of claim 27, further comprising an actuation arrangement which causes said mold body to rotate about said axis of rotation between a first position wherein said water can be introduced into said at least one cavity and a second position wherein said ice can be discharged from said at least one cavity.
29. The apparatus of claim 28, further comprising a controller configured to cause said actuation arrangement to rotate said mold body about said axis of rotation and to activate said heater under at least one of:
- a condition when said mold body is in said second position; and
- a condition when said mold body is in said first position and about to rotate to said second position.
30. The refrigerator of claim 29, wherein said controller is configured to activate said heater at least under said condition when said mold body is in said first position and about to rotate to said second position, further comprising a secondary rack located to scoop said ice our of said mold body as said mold body rotates from said first position to said second position.
Type: Application
Filed: Aug 17, 2010
Publication Date: Feb 23, 2012
Inventor: Aaron Matthew McDANIEL (Louisville, KY)
Application Number: 12/857,772
International Classification: F25C 1/00 (20060101);