1. Related Applications
The present invention claims priority from Korean patent application number 10-2006-0126835, filed on Dec. 13, 2006, which is also hereby incorporated by reference in its entirety.
2. Field of the Invention
The present invention relates to an instantaneous steam boiler generating steam in a steam cleaner, a steam-vacuum cleaner, a steam iron, etc. More specifically, the present invention relates to an instantaneous steam boiler featuring a short heater return line by curving or twisting a U-shaped heater return portion.
3. Background of the Invention
Steam boilers are largely classified into reservoir type water heaters and instantaneous water heaters. The reservoir type water heater has an electric boiler built in a water tank. By heating the steam boiler, water temperature increases and the heated water finally generates steam (vapor). The steam is then discharged through a steam outlet on the top of the water tank.
However, since heat is transferred from the heater 25 to the transfer tube (i.e., conduction system), the transfer tube is typically made long (curved U-shape tube) and wide in order to produce sufficient steam. When the transfer tube has an extended length, it is more likely to retain water therein and fur exposure is inevitable. That is to say, it is rather natural that the transfer tube constantly being exposed to water is furred up (because of the presence of impurities) or has an oxidation coating or scale (which is a thin film of an oxide formed on the surface of metal as a result of chemical reaction when the metal is heated) especially when the tube is made out of metal. Such fur or oxidation coating is descaled when it reaches a certain thickness. Unfortunately though, this descaled fur or oxidation coating is particularly fatal to the instantaneous steam boiler. Because a steam outlet of a conventional instantaneous steam boiler normally has a small volume and a very small diameter, the boiler may easily get clogged up, producing steam in an unstable and non-uniform manner and losing pump pressure. These drawbacks are led to a serious deterioration in the durability of the steam boiler.
In addition, a complicated mold structure is required to form the projections 26 and a separate process needs to be done in order to connect/separate an upper and a lower body. Prior art instantaneous water heaters are normally built in a body made of a thermoconductive metal such as aluminum having a water transfer tube (or hose) formed therein. When the heater temperature increases, its heat is transferred to the body and water traveling inside the transfer tube in the body is eventually converted into steam.
It is, therefore, an object of the present invention to provide an instantaneous steam boiler made in a smaller size by reducing the length of a U-shaped heater. It is a further object of the invention to eliminate the need for a complicated mold structure in an instantaneous steam boiler. Finally, it is a further object of the invention to reduce clogging by reducing oxidation in an instantaneous steam boiler.
In accordance with the present invention, there is provided an instantaneous steam boiler, including: a body composed of an inlet for water, an outlet for steam, and a flow path. The invention includes a U-shaped heater installed at the body and formed of two linear portions and a return portion, wherein the return portion of the heater is curved and twisted.
According to an exemplary embodiment of the present invention, the length of the heater is reduced as much as it is curved and twisted, so the entire steam boiler is consequently made smaller and lighter.
By adopting a structure of a flow tube where the water inlet, the steam outlet, and the flow path come in contact with the heater, the transfer path of the flow tube is substantially reduced through the contact with the heater and water does not remain stationed in the tube. This in turn makes it possible to suppress the formation of fur or an oxidation coating as much as possible. In addition, since the body is molded with the heater and the flow tube already inserted, an assembly/disassembly process is not required.
Moreover, with the U-shaped transfer tube, the contact efficiency between the tube and the heater increases, and a steam boiler incorporating such tube does not occupy a lot of space but is easily installed in a small space. Particularly, if the flow tube is made out of copper materials, it demonstrates excellent heat conductivity. Therefore, steam can be supplied in a stable manner even when the flow tube length is reduced even further.
The other objectives and advantages of the invention will be understood by the following description and will also be appreciated by the embodiments of the invention more clearly. Further, the objectives and advantages of the invention will readily be seen that they can be realized by the means and its combination specified in the claims.
Hereinafter, preferred embodiments of the present invention will be set forth in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the invention.
The heater 110 is preferably formed into a U shape. That is, the heater 110 is composed of a first linear portion 111 and a second linear portion 113 in parallel to each other and an arc-shaped return portion 115. Ports 112 and 114 are formed at the other ends of the first linear portion 111 and the second linear portion 113.
Similar to the heater 110, the flow tube 130 is also preferably formed into a U shape. One end of the flow tube 130 functions as an inlet 131 for water and a second, and opposite end functions as an outlet 133 for steam. As further shown in
Design of a U-shaped flow tube 130 arranged in parallel with the heater 110, rather than a linear shaped flow tube, increases the flow of water over the heater, thereby increasing the exposure to heat and maximizing steam production. More specifically, as the flow tube 130 and the heater 110 are brought into contact with each other, heat is transferred to the flow tube 130 by direct heating, not by conduction, convection, or radiation.
Moreover, use of such a flow tube design, rather than conventional integral flow paths, improves efficiency since water is not left to stand in the tube. Accordingly, the steam outlet 133 can be kept from getting clogged up by fur or any oxidation coating.
Further, because the flow tube 130 and the heater 110 are in contact with each other, it is possible to mold the body 150 as one unit with the flow tube 130 and the heater 110 already inserted. That is to say, the heater 110 and the flow tube 130 lying upon the top of the heater 110 are tied up with a binding twine for example. The heater 110 and the flow tube 130 being tied up together are then inserted to a mold for forming the body 150. In so doing, the water inlet 131 and steam outlet 133 of the flow tube 130 and the ports 112 and 114 of the heater 110 are embedded in the body 150, while part of each being exposed to outside. The body 150 is obtained by die casting or injection molding. Molding of such a one unit body eliminates an assembly/disassembly process and improves productivity.
Preferably, the flow tube 130 is made out of copper material. Copper is nontoxic and demonstrates a high corrosion resistance and an excellent thermal conductivity so it contributes not only to a decrease in the length of the flow tube 130 but also to a substantial improvement on the evaporation rate (or water vaporization rate).
Finally, use of a separate U-shaped flow tube 130 arranged in a parallel and being in contact with the heater 110 in the steam boiler 100, reduces the traveling path of water and increases the evaporation rate. This enables to expand the diameters of the water inlet 131 and steam outlet 133, compared with conventional steam boiler designs. The diameter of the water inlet 131 is closely related to an amount of water input. Therefore, provided that the same amount of water is fed, an increased diameter can lower pump pressure, thereby reducing noises or vibrations as much as possible. Also, the wider steam outlet 133 allows the steam to easily escape despite the presence of small impurities in water, so the tube is hardly clogged up.
Such an arrangement allows the elongated portions of the heater to be reduced, thereby reducing the overall length of the heater and shortening the length of the body 450. That is, in case of a steam cleaner, a steam boiler is built in a main body with a bottom or is installed at an extension bar. When the steam boiler is built in the main body, the size of the main body is increased especially if the body 450 is large by itself. This makes it difficult to clean the gap between the steam boiler and the body. The space becomes even smaller when the main body is designed as a vacuum cleaner as well. Meanwhile, when the steam boiler is installed at the extension bar, it creates a large-size steam boiler that does not look stylish or neat in design. From these aspects, the coiled or twisted return portion 415 of the heater 410 is a first optimization process for producing small, light appliances. Moreover, the flow tube 430 can be made shorter as much as the reduced length of the body 450.
It is also evident to people skilled in the art that the length of the heater 410 can be reduced by bending the return portion 415 of the heater 410 into a further horizontal shape such that the overall shape of the heater is an M-shape. The operational effects of the heater 410 of the fourth embodiment are the same whether it is installed at a separate flow tube or whether it is built in a steam boiler with a body and a flow tube combined as one unit.
As has been explained so far, the instantaneous steam boiler of the present invention has the following advantages. With the twisted/coiled return portion of the U-shaped heater, the length of the heater is reduced as much as the twisted/coiled length. This substantially reduces the overall size of the steam boiler and further enables to manufacture small, light appliances.
In addition, by separately embodying the flow tube in contact with the U-shaped heater, heat transfer to the flow tube is done by direct heating, not by conduction, convection, or radiation. Therefore, even though the traveling path of water may be reduced substantially, water evaporation still takes place and water is not left to stand in the tube. Consequently, the steam outlet can be kept from getting clogged up by fur or an oxidation coating.
Moreover, because the flow tube and the heater are inserted to a mold for the body while they are in contact with each other, an assembly/disassembly process is no longer required and such a simple structure of the molding for the body can markedly lower manufacturing costs.
Besides, the U-shaped flow tube features a high contact efficiency with the heater yet occupies a small portion of the space defined in the product, resulting in a substantial decrease in manufacturing costs.
Further, in the preferred embodiments described herein, the flow tube is preferably made out of copper material which is nontoxic and demonstrates a high corrosion resistance and an excellent thermal conductivity. Therefore, even though the length of the flow tube may be shortened even further, steam can be supplied in a stable manner.
While the present invention has been described with respect to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Number | Date | Country | Kind |
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10-2006-0126835 | Dec 2006 | KR | national |