WATER HEATER
A water heater apparatus includes an inner tank, an outer tank, heat bands disposed on the outside of the outer tank, an interior coil supplying water to the inner tank, and a heating element for heating water in the inner tank. The inner tank and outer tank are concentrically arranged with a labyrinthine passage in between, so that water spends an additional amount of time flowing in the passage while it is being heated by the heat supplied from the band heaters. The water heater apparatus can thereby provide heated water ready for delivery, as well as maintaining a start up heat.
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNot applicable.
FIELD OF THE INVENTIONThe present invention relates generally to an apparatus for providing heated water ready for delivery. More particularly, this invention is directed to an apparatus or device for heating water for immediate delivery as well as maintaining a start up heat.
BACKGROUND OF THE INVENTIONAs noted in U.S. Pat. No. 4,242,569 to Kayser, hot water tanks are known which have inner and outer tanks for heating water.
In U.S. Pat. No. 4,860,728 to Nelson, a water heater is shown which includes an inner tank surrounded by an outer shell.
U.S. Pat. No. 5,006,689 to Kurachi et al. teaches inner and outer tanks along with a vacuum heat insulation layer and electrically heated bubble pump unit.
There is a need for an apparatus or device for quickly providing a stream of hot water, ready for delivery. Further, there is a need for an apparatus or device for heating water for immediate delivery as well as maintaining a start up heat.
SUMMARY OF THE INVENTIONFrom the foregoing, it is seen that it is a problem in the art to provide a device meeting the above requirements. According to the present invention, a device is provided which meets the aforementioned requirements and needs in the prior art. Specifically, the device according to the present invention provides an apparatus or device for quickly providing a stream of hot water, ready for delivery. More particularly, this invention is directed to an apparatus or device for heating water for immediate delivery as well as maintaining a start up heat.
The device according to the present invention includes an inner tank, an outer tank, heat bands disposed on the outside of the outer tank, an interior coil supplying water to the inner tank, and a heating element for heating water in the inner tank. The inner tank and outer tank are concentrically arranged with a labyrinthine passage in between, so that water spends an additional amount of time flowing in the passage while it is being heated by the heat supplied from the band heaters.
In use, water enters the unit through an inlet and travels through a coil that is suspended on the inside of the inner tank. Water then exits the coil and enters the outer tank, and then travels through a water channel that is formed with spacers placed between the outside of the inner tank and the inside of the outer tank. Water leaves the outer tank heated to the desired temperature.
A heating element in the inner tank heats the water inside the inner tank. The water inside the inner tank heats the water passing through the coil so as to keep the entire unit at a desired operating temperature, and is also a partial source of the hot water supply. Fresh water constantly passes through the inner tank when in use. The band heaters are controlled separately. The demand determines how many of the individual band heaters work at any given time during use.
Hot water is stored in the inner tank, the coil, the outer tank, and the water channel. When a small amount of hot water is needed, hot water is supplied from those areas. When the temperature cools, the band heaters are activated and water is heated as needed.
The flow of water passing through the inner tank is limited so that the heating element is not overwhelmed, and therefore can remain a heat source for the unit.
Metal strips form the water channel, and also act as a heat exchanger between the inner and outer tanks. A thermal jacket is placed on the outside of the unit to minimize heat loss and maximize the efficiency of the band heaters. After the band heaters are activated, the unit will produce as much hot water as desired with zero recovery time.
Other objects and advantages of the present invention will be more readily apparent from the following detailed description when read in conjunction with the accompanying drawings.
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In a preferred embodiment, the water heater apparatus 100 is relatively small and extends only about 11 or 12 inches in diameter and about 18 inches in length, and the openings 180 and 280 are about one-eighth inch in diameter. However, the specific dimensions can be varied within the scope of the present invention, and all such variations are contemplated as being within the scope of the present invention.
In use, water enters the unit through an inlet and travels through a coil that is suspended on the inside of the inner tank. Water then exits the coil and enters the outer tank, and then travels through a water channel that is formed with spacers placed between the outside of the inner tank and the inside of the outer tank. Water leaves the outer tank heated to the desired temperature.
A heating element in the inner tank heats the water inside the inner tank. The water inside the inner tank heats the water passing through the coil so as to keep the entire unit at a desired operating temperature, and is also a partial source of the hot water supply. Fresh water constantly passes through the inner tank when in use. The band heaters are controlled separately. The demand determines how many of the individual band heaters work at any given time during use.
Hot water is stored in the inner tank, the coil, the outer tank, and the water channel. When a small amount of hot water is needed, hot water is supplied from those areas. When the temperature cools, the band heaters are activated and water is heated as needed.
The flow of water passing through the inner tank is limited so that the heating element is not overwhelmed, and therefore can remain a heat source for the unit.
Metal strips form the water channel, and also act as a heat exchanger between the inner and outer tanks. A thermal jacket is placed on the outside of the unit to minimize heat loss and maximize the efficiency of the band heaters. After the band heaters are activated, the unit will produce as much hot water as desired with zero recovery time.
The invention being thus described, it will be evident that the same may be varied in many ways by a routineer in the applicable arts. Such variations are not to be regarded as a departure from the spirit and scope of the invention and all such modifications are intended to be included within the scope of the claims.
Claims
1. An apparatus for heating water, comprising:
- an outer tank having a circumferential wall, a top plate, and a bottom plate;
- an inner tank having a circumferential wall, a top plate, and a bottom plate; and said inner tank being disposed within said outer tank,
- a coil having a main body portion, an inlet, and an outlet; wherein said main body portion of the coil is disposed inside said inner tank, said inlet of the coil extends through the bottom wall of the inner tank and the bottom wall of the outer tank;
- a heating element extending into an interior of said inner tank; and
- an outlet conduit connected to said outer tank, and communicating with an interior of said outer tank.
2. An apparatus for heating water as claimed in claim 1, further comprising a plurality of band heaters connected to an exterior of said outer tank.
3. An apparatus for heating water as claimed in claim 2, further comprising a plurality of spacers disposed between said inner tank and said outer tank, forming a labyrinthine passage for fluid flow, so that all of the fluid flowing into said outlet conduit first passes through said labyrinthine passage.
4. An apparatus for heating as claimed in claim 3, wherein said labyrinthine passage provides additional time for heat transfer to occur between said band heaters and said fluid.
5. An apparatus for heating water as claimed in claim 3, wherein said plurality of band heaters are selectively actuatable, to selectively vary the amount of heat supplied to said outer tank.
6. An apparatus for heating water as claimed in claim 1, further comprising a pop off valve disposed through an upper plate of said outer tank.
7. An apparatus for heating water as claimed in claim 1, wherein said inner tank has a cylindrical wall, an upper plate and a lower plate; and said outer tank has a cylindrical wall, an upper plate and a lower plate.
8. An apparatus for heating water, comprising:
- an outer tank having a circumferential wall, a top plate, and a bottom plate;
- an inner tank having a circumferential wall, a top plate, and a bottom plate; and said inner tank being disposed within said outer tank,
- a coil having a main body portion, an inlet, and an outlet; wherein said main body portion of the coil is disposed inside said inner tank, said inlet of the coil extends through the bottom wall of the inner tank and the bottom wall of the outer tank;
- a heating element extending into an interior of said inner tank;
- an outlet conduit connected to said outer tank, and communicating with an interior of said outer tank;
- a plurality of band heaters connected to an exterior of said outer tank; and
- an elongated spacer member helically arranged along the outside surface of said inner tank, forming a helical passage for fluid flow, so that all of the fluid flowing into said outlet conduit first passes through said helical passage.
Type: Application
Filed: Aug 11, 2008
Publication Date: Feb 11, 2010
Inventors: Michael Williams (Wartrace, TN), Matt Williams (Wartrace, TN)
Application Number: 12/189,332
International Classification: F24H 1/00 (20060101);