Self-Warming Container
An apparatus for warming substances comprising a container, said container including a first compartment containing a substance that reacts exothermically with water, a second compartment containing water, wherein said second compartment is attached to said first compartment by a valve, and a third compartment, wherein at least 50% of the third compartment's volume is surrounded by said first compartment, and wherein said first and third compartments are separated by a thermally conductive wall. In a preferred embodiment, the substance that reacts exothermically with water is an anhydrous zeolite.
This invention relates to systems and methods for containers that can warm their contents using an exothermic reaction, such as mixing water with anhydrous zeolites. This application claims benefit under 35 U.S.C. §120 of the filing date for application No. 61/790,297 filed Mar. 15, 2013.
BACKGROUND OF THE INVENTIONIt is often desirable to be able to heat or reheat items like meals or baby bottles while on the go, away from the convenience of typical heating units such as microwaves. Many portable warming devices rely on power cords, which necessitate the availability of power outlets, to warm their contents. Other such portable warming devices rely on battery power, which have a limited life span, or electrical heating components, which present the possibility of component failure or wear out. Many “cordless” portable devices require time-consuming charging or recharging periods each time the device is used. Additionally, many such portable heating devices only warm their contents but provide no method of maintaining temperature prior to the warming process.
A novel self-warming container presents a solution to these dilemmas. The container warms its contents at the touch of a button by harnessing heat generated from an internal and enclosed exothermic reaction. To recharge the container for additional uses, one need only microwave the container for a few minutes, resetting the chemical reaction to its initial state. The container is then ready to heat its contents again minutes or even days later. The self-warming container has an array of uses, from heating food for lunches and picnics to warming baby bottles and wipes. The self-warming container can take a variety of configurations depending on its intended use. The invention is especially well suited for food storage, as the design allows it to maintain a relatively constant temperature even prior to warming. Therefore, if refrigerated, the container will keep food cool for a significant amount of time prior to warming.
BRIEF SUMMARY OF THE INVENTIONThe invention is a self-warming container, which requires no outside energy input (such as power cords or batteries) to warm its contents other than the addition of water prior to use. The container will begin to warm contents at the touch of a button, so that the user has control of when the contents are to be heated. Additionally, the container only need be heated in the microwave or oven for a few minutes and the water replenished to recharge the heating capabilities of the unit before the next use of the device. In some embodiments of the invention, due to the thermal mass of the container, it could also be used to keep food at a cool temperature prior to warming, if the container is stored in a cool environment, like a refrigerator, prior to use.
To prepare the device for heating, water is added to an internal water reservoir in the container. To initiate warming, a button adjacent to the water reservoir is depressed. When the button is depressed, the water mixes with a heat producing substance. The interaction between the water and the heat-producing substance causes an exothermic reaction, and the heat is dissipated to the container to warm the contents.
To reset the heating process, the container is microwaved or placed in the oven to dehydrate the heat-producing substance, which causes the heat-producing material to “reset” itself. Water vapor escaping the container during this “resetting” is vented through a one way valve leading away from the container or is condensed back into the water reservoir. The valve seals itself so that water vapor form the ambient air cannot enter the container and inadvertently interact with the heat producing material.
There are a number of possible configurations for the invention, based on the size and type of contents to be warmed. For each configuration the method of heating is the same as detailed above. All embodiments include at least one compartment for contents to be warmed and at least one water reservoir compartment, with a surrounding thermal shell for temperature control and heating.
The design of the invention can take on any number of configurations, depending on the intended use of the device. All configurations have at least the following components: an internal compartment for storing the contents to be warmed, an internal water reservoir compartment, an outer shell which houses the heat-producing substance and reaction, and a button by which the user can initiate the heating reaction. In some embodiments of the invention, a one-way valve connects the outer shell to the ambient atmosphere, allowing water vapor to escape the device. In other embodiments, water vapor is condensed back into the water reservoir chamber.
To warm contents of the container, the outer button is depressed, which opens a valve between the water reservoir and heat-producing substance. Such a substance would produce an exothermic reaction when hydrated, so the mixture of the two compartments would release heat to the internal contents of the container, thereby heating the contents. To reset the container for future uses, the device is placed in the microwave or oven to dehydrate the heat-producing substance, reversing the reaction and restoring the container to its original state. The water reservoir is refilled with water, and the container is again ready to be used to warm its contents with the push of a button.
Due to the need for the container to contact food and also be exposed to a wide range of temperatures, the materials for construction of the container need all be of food-grade quality, as determined by the Food and Drug Administration (FDA). In addition, because the container may be microwaved or placed in the oven to recharge the heat-producing substance, but could also be stored in the refrigerator, the materials of construction must be able to withstand a wide range of temperatures, especially high temperatures. In some embodiments of the invention, these construction materials could be a number of different food-grade silicone rubbers or other materials which meet the criteria outline above. In addition, all spring and valve-like components would also be made of temperature resistant, non-metallic materials to prevent sparking when heated.
CONTENTS COMPARTMENTIn all configurations of the invention there is at least one internal compartment 101 to hold the contents to be warmed, such as food, liquids, lotions, or towlettes. This compartment 101 can take on different sizes and shapes dependent on the intended use. Such a compartment can be seen in
All configurations of the invention also contain at least one internal compartment 301 for holding water, which is separated from the contents to be heated by internal walls 302, seen in the cut-out view in
An outer shell 303 surrounds the contents and water reservoir compartments of the invention. The outer shell is separated from the other compartments by internal walls 302, 306. In one embodiment of the invention, illustrated in
Additionally, due to the insulated outer layer of the container and the thermal mass of the container as a whole, the temperature of the invention will remain relatively constant even prior to warming. To this effect, it is possible that in some embodiments of the invention, such as in food storage, the self-warming container could be stored in the refrigerator prior to use, and the container would maintain its refrigerated temperature prior to the start of the warming process.
POWER BUTTON AND INITIATION MECHANISMAll configurations of the invention have a start button 103 which activates the warming container. The button 103 is comprised of two individual components, as seen in
Internally, the button connects to a spring 502 which runs the length of the water reservoir 301. This spring is connected at the opposite terminal to the valve 501 controlling the separation of the water reservoir and the heat-producing substance. When the user depresses the button 103, the spring engages the valve and opens the separation between the water reservoir and the heat-producing substance. In this manner, the user controls when the container begins to heat its contents by starting the heating reaction by pressing the button. Steam Releasing Valve:
In some embodiments of the invention, to reset the container after it is used for heating it must be placed in the microwave or oven to dehydrate the heat-producing material. During dehydration, the water which interacted with the heat producing material will be evaporated. To allow for this water vapor to escape the outer shell 303, a one-way valve 602 connects the inner space of the shell to the ambient atmosphere (see
In one embodiment of the invention, shown in
To connect the heating cartridge to the main container, there could be a moveable or pivoting portion of the main container outer wall 709, creating a door or port cover, which allows room for the cartridge to be positioned into place. This door or port cover would engage the cartridge and lock it in place, possibly via a spring-loaded mechanism. To provide continuity from the water reservoir in the main container 706 to the cartridge containing the heating material, there could be a junction 708 which allows the end of the heating cartridge to snap or fit up against the end of the water reservoir when it is positioned in the main container. Additionally, a removable barrier component 710 could be present in the heating cartridge to prevent external moisture from entering the heating substance 702 before the cartridge is positioned on the main container. The water-vapor release valve could be present in this heating cartridge, rather than on the main container as in other embodiments.
Claims
1. An apparatus for warming substances comprising:
- a container, said container comprising
- a first compartment containing a substance that reacts exothermically with water;
- a second compartment containing water, wherein said second compartment is attached to said first compartment by a valve; and
- a third compartment, wherein at least 50% of the third compartment's volume is surrounded by said first compartment, and wherein said first and third compartments are separated by a thermally conductive wall.
2. The apparatus of claim 1, wherein the substance that reacts exothermically with water is a zeolite.
3. The apparatus of claim 2, further comprising a layer of insulating material that surrounds the surface of the first chamber opposite the third chamber.
4. The apparatus of claim 2, further comprising a fourth compartment that surrounds the first compartment is substantially void of matter to create a vacuum insulating layer.
5. The apparatus of claim 2, further comprising a one-way release valve attached to the first chamber, said one-way release valve capable of allowing water vapor to escape from the first chamber when the vapor pressure in the first chamber is greater than ambient pressure outside the container.
6. The apparatus of claim 1, further comprising a layer of insulating material that surrounds the surface of the first chamber opposite the third chamber.
7. The apparatus of claim 1, further comprising a fourth compartment that surrounds the first compartment is substantially void of matter to create a vacuum insulating layer.
8. The apparatus of claim 1, further comprising a one-way release valve attached to the first chamber, said one-way release valve capable of allowing water vapor to escape the container from the first chamber when the vapor pressure in the first chamber is greater than ambient pressure outside the container.
9. An apparatus for warming substances comprising:
- a container, said container including an outer shell, said container further comprising: a first compartment situated within the volume circumscribed by the outer shell; a second compartment situated within the volume circumscribed by the outer shell, wherein said second compartment is attached to said first compartment by a regulator; and a third compartment, wherein the third compartment's volume is partially bordered by said first compartment, and wherein said first and third compartments are separated by a thermally conductive wall; a heating material, situated within said first compartment, said heating material being a substance that reacts exothermically with water when in anhydrous form.
10. The apparatus of claim 9, wherein the heating material is zeolite.
11. The apparatus of claim 10, wherein the zeolite is an aluminosilicate.
12. The apparatus of claim 9, further comprising an access door that is capable of opening to allow access to said first compartment.
13. The apparatus of claim 12, wherein the heating material is contained within a removable cartridge that fits within said first compartment.
14. A method for warming a substrate material comprising:
- placing said substrate material in a container, said container comprising a first chamber containing a material that reacts exothermically with water, a second chamber containing water; and a closed conduit connecting said first and second chambers;
- opening said closed conduit to introduce said water to said material that reacts exothermically with water, thereby initiating an exothermic reaction; and
- allowing said exothermic reaction to heat said substrate material.
15. The method of claim 14, wherein said container is insulated.
16. The method of claim 14, wherein the container has a volume of less than 10 liters.
17. The method of claim 16, wherein the container has a volume of less than 5 liters.
18. The method of claim 14, wherein the substrate material is food.
19. The method of claim 14, wherein the heating material is a zeolite.
20. The method of claim 19, further comprising heating the container and the zeolite until the zeolite has reverted to an anhydrous form.
Type: Application
Filed: Mar 14, 2014
Publication Date: Sep 18, 2014
Inventor: Rodney M. Shields (Ukiah, CA)
Application Number: 14/213,612
International Classification: F24J 1/00 (20060101);