Patent Publication Number: US-7903958-B2

Title: Hanging water heater

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a hanging water heater, particularly to one having a machine body installed therein with lots of quartz heating tubes with water inlets and vapor outlets for carrying out heat conduction by vapor, and by light and heat radiation, impossible to produce water stains and able to economize energy source. 
     2. Description of the Prior Art 
     Generally, people are used to taking a bath with hot water in a cold winter to wash off dirt of the body and refresh themselves. 
     Conventional water heaters are classified into electric water heaters and gas water heaters, but most families prefer using electric water heaters instead of gas water heaters for the sake of safety because gas water heaters are likely to produce carbon monoxide and cause an accident of toxicosis. 
     The conventional water heater is provided with heating members in the interior of a metal casing to be electrically connected for producing heat energy to be conducted by metal conductors for heating water; however, the metal conductors are most likely to produce water dirt on the surfaces to influence effect of heat conduction, thus wasting electric energy and shortening service life of a water heater. 
     SUMMARY OF THE INVENTION 
     The objective of this invention is to offer a hanging water heater provided with a machine body having its internal wall disposed with a heat-preserving double layer. The machine body has its upper and lower portion respectively and correspondingly fixed with a plurality of assembling bases. Plural quartz heating tubes are respectively installed between two corresponding assembly bases, respectively composed of a quartz external tube having its opposite ends sealed, and a quartz internal tube positioned in the quartz external tube, having one end connected with an electrode terminal and installed inside with a remote-infrared-ray heating member. In addition, each quartz external tube has its lower wall bored with water intakes and its upper wall bored with vapor vents. The machine body is further provided with a water inlet and a water outlet that communicates with a circulating tube in the machine body. The circulating tube communicates with the vapor vent of the quartz external tube, having its wall bored with lots of through holes to let vapor in the circulating tube to flow back to the interior of the machine body. Further, the machine body is bored with an exhaust vent assembled thereon with a pressure release valve communicating with the exhaust vent for releasing excessive pressure from the machine body to avoid causing an accident. The hanging water heater of this invention carries out heat conduction by means of vapor, and light and heat radiation, impossible to produce water stains and able to economize energy. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       This invention will be better understood by referring to the accompanying drawings, wherein: 
         FIG. 1  is a side cross-sectional view of a hanging water heater in the present invention; 
         FIG. 2  is a side cross-sectional view of the hanging water heater in a using condition in the present invention; and 
         FIG. 3  is another side cross-sectional view of the hanging water heater in a using condition in the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A preferred embodiment of a hanging water heater in the present invention, as shown in  FIG. 1 , includes a machine body  1 , a plurality of quartz heating tubes  2  and a circulating tube  3  as main components combined together. 
     The machine body  1  has its external wall provided with a heat-preserving sandwich layer  11 , and its inner upper and lower side respectively and correspondingly fixed with a plurality of assembling bases  12 . 
     The quartz heating tubes  2  are respectively installed between two corresponding assembly bases  12 , respectively composed of a quartz external tube  21  having its opposite ends sealed, and a quartz internal tube  22  positioned in the quartz external tube  21  and provided therein with a remote-infrared-ray heating member  23  preferably made of carbon fiber. The quartz internal tube  22  had one end connected with an electrode terminal  221  to be electrically connected to let the remote-infrared-ray heating member  23  produce remote infrared rays and heat energy. The quartz external tube  21  has its opposite ends combined with the quartz internal tube  22  by thermal compression, letting the electrode terminal  221  of the quartz internal tube  22  extended out of the quartz external tube  21  and having an accommodating space  211  formed between the quartz external tube  21  and the quartz internal tube  22 . Further, each quartz external tube  21  has its lower sidewall bored with plural water intakes  212  and its upper sidewall bored with plural vapor vents  213 . 
     The machine body  1  is further provided with a water intake  13  connected with a water source for supplying cold water, and a water outlet  14  for hot water to flow out for use. 
     The circulating tube  3  is assembled inside the machine body  1 , connected with the water outlet  14  and communicating with the vapor vents  213  of the quartz external tubes  21  by means of ducts  4 . The circulating tube  3  has its sidewall bored with lots of through holes  31  for vapor in the circulating tube  3  to flow back to the interior of the machine body  1 . 
     Furthermore, the machine body  1  has its upper side bored with an exhaust hole  15  provided thereon with a pressure valve  151  communicating with the exhaust hole  15  for releasing excessive pressure from the machine body  1  to avoid accidents caused by excessively high pressure. In addition, the machine body  1  is provided at its topside with a water level meter  16 , a pressure meter  17  and a temperature meter  18  for facilitating inspection of water level, pressure and temperature inside the machine body  1 . The hanging water heater of this invention can be automatically controlled to stop water from flowing into the machine body  1  when the water level is too high and controlled to stop carrying out heating when the temperature is excessively high. 
     In using, referring to  FIGS. 2 and 3 , cold water is first supplied to flow into the interior of the machine body  1  through the water intake  13  and, after the cold water flowing into the machine body  1  reaches a proper water level, it will flow into the accommodating space  211  between the quartz external tube  21  and the quartz internal tube  22  through the water intakes  212  bored in the lower walls of the quartz external tube  21 . Since the quartz internal tubes  22  are respectively installed inside with a remote-infrared-ray heating member  23  able to produce light and heat radiation and heat energy with extremely high temperature; therefore, the water flowing in the accommodating spaces  211  will be quickly boiled and vaporized. Afterward, the boiled water will be exhausted out through the vapor vents  213  respectively bored at the upper walls of the quartz external tubes  21  and then flow into the circulating tube  3  through ducts  4 . Simultaneously, the vapor in the circulating tube  3  will be exhausted out through the through holes  31  in the wall of the circulating tube  3  and get into the machine body  1 ; therefore, water temperature in the machine body  1  will rise quickly by heating of light and heat radiation and by hot water convection and especially by heating of boiling vapor, achieving effect of energy saving. Additionally, the water flowing into the accommodating space  211  between the quartz external tube  21  and the quartz internal tube  22  is heated, vaporized and heat conducted via light and heat radiation by means of the remote-infrared-ray heating members  23  so it is impossible to produce water stains. When hot water is to be used, only turn on the control valve of the water outlet  14  to enable hot water of condensed vapor in the circulating tube  3  to flow out, and at this time the vapor exhausted out through the vapor vents  213  of the quartz external tube  21  will heighten the pressure of the water vapor in the machine body  1  to let the hot water flow out for use more conveniently. 
     As can be understood from the above description, this invention has the following advantages.
         1. The water inside the machine body can be heated to high temperature quickly via light and heat radiation produced by the remote-infrared-ray heating members and by convection of hot water as well as by heated vapor, able to quickly raise water temperature and greatly economize energy.   2. The water flowing in the accommodating space between the quartz external tube and the quartz internal tube is heated and vaporized by the remote-infrared-ray heating members inside the quartz internal tube and by heat conduction of vapor as well as by light-heat radiation, able to avoid producing water stains and prolong service life of the hanging water heater.   3. As mentioned above, the hanging water heater of this invention will never produce water stains to affect heat conduction, having excellent effect of energy saving.   4. The remote-infrared-ray hearting members inside the quartz internal tubes are heated to maintain extremely high temperature all the time; therefore the water flowing into the accommodating space between the quartz external tube and the quartz internal tube can be quickly boiled and vaporized. Afterward, such hot water and vapor will flow into the circulating tube through the vapor vents at the upper sidewall of the quartz external tubes and then be exhausted out through the through holes of the circulating tube and get into the machine body to heighten the pressure of water vapor inside the machine body, effectively increasing pressure for facilitating outflow of hot water.       

     While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.