Patent Publication Number: US-6705252-B2

Title: Vaporizer

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to a vaporizer, particularly to one capable to speedily convey and vaporize liquid in a vaporizing tube. 
     A common conventional vaporizer generally includes a cast block  1  made of zinc-aluminum alloy and an electric heating tube  10  and a water conveying tube  11  both contained in the cast block  1 . Then the case block  1  is heated up by the electric heating tube  10 , and then the water conveying tube  11  is heated up by the heat of the cast block  1  so that liquid flowing in the water conveying tube  11  is also heated up to become vapor. The time required in vaporizing may be 2-3 minutes at least or more than ten minutes at latest depending on the capacity of the electric heating tube  10 , as high temperature produced by the electric heating tube  10  has to be transmitted to the cast block  1  and the heat absorbed by the cast block  1  is then transmitted to the water conveying tube  11 , whose heat is then absorbed by liquid flowing in the water conveying tube  11 . Then the liquid in the tube  11  has to be boiled to become vapor. Therefore, if the liquid in the tube  11  is to be vaporized in two or three minutes, a large amount of electricity is needed to heat up swiftly the electric heating tube  10  in order to vaporize liquid in 2 or 3 minutes. Or liquid in the water conveying tube  11  has to be heated up by the heat absorbed by the water conveying tube  11  for more than ten minutes in case of the electric heating tube  10  having a small capacity, quite inconvenient to use. 
     The conventional vaporizer described above uses the electric heating tube  10  for indirectly heating liquid flowing through the water conveying tube  11 , having inferior effect in vaporizing due to insufficient heat capacity so that liquid drops may remain at the outlet end of the water conveying tube  11 , hardly meeting the using standard. 
     SUMMARY OF THE INVENTION 
     This invention has been devised to offer a vaporizer having better effect than the conventional ones. 
     The vaporizer in the invention has the following feature. 
     1. It includes a pump for pumping liquid to be conveyed to a helical vaporizing tube, which has its two ends connected to two output terminals of a power source of a control system, for vaporizing liquid in the vaporizing tube very swiftly. 
     2. The vaporizing tube in the invention is shaped helical, having the lowest temperature at an inlet end and the highest temperature at an outlet end, preventing the liquid from reversely flowing back to the pump due to a low pressure of the liquid at the inlet end of the vaporizing tube. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     This invention will be better understood by referring to the accompanying drawings, wherein: 
     FIG. 1 is a side view of a conventional vaporizer; 
     FIG. 2 is a perspective view of a vaporizer in the present invention; 
     FIG. 3 is a perspective view of a vaporizing tube in the present invention; and, 
     FIG. 4 is a perspective view of vapor produced by the vaporizing tube in the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A preferred embodiment of a vaporizer in the present invention, as shown in FIG. 2, includes a pump  2 , an inlet tube  20  fixed on a side of the pump  2  for pumping in liquid in a liquid store tank (not shown), a vaporizing tube  3 , and an outlet tube  21  provided between the pump  2 , the vaporizing tube  3 , a tube clamp  4 , two leads  5 , and a control system  6  as main components combined together. 
     The vaporizing tube  3  is shaped helical, having an inlet end  31 , an annular connect tube  30  connected to the inlet end  31 , also connected to the outlet tube  21 , and an outlet end  32  penetrating through a tube clamp  4  constituted of plural crossing leads  40 , as shown in FIGS. 3 and 4. Then the two leads  50 ,  51  are respectively connected to the annular connect tube  30  and the tube clamp  4 . Further the control system  6  for heating is connected to the annular connect tube  30  and to the tube clamp  4 . When the control system  6  is handled to function through the leads  50 ,  51 , then the vaporizing tube  3  produces immediately high temperature to heat up the liquid flowing through the vaporizing tube  3  so that the liquid becomes vapor to shoot out of the outlet end  32 . Thus, when the vaporizer is powered, it produces vapor at once. 
     As much liquid flows in the helical vaporizing tube  3  and the pump  2  produces pressure for pushing forward the liquid in the vaporizing tube  3 , vapor produced may be swiftly exhausted out of the outlet end  32 . On the other hand, liquid of room temperature flows at first in the helical vaporizing tube  3  to keep the liquid in the inlet end  31  at the lowest temperature, increasing swiftly its temperature as it moves forward in the tube  3 . Then the liquid may ultimately become vapor when reaching the outlet end  32 . Moreover, the temperature at the inlet end  31  is maintained low, preventing liquid in the tube  3  from flowing back to the pump  2 , and consequently keeping smooth forward flowing of liquid in the vaporizing tube  3 . In addition, the vaporizer in the invention does not have problems of drops occurring or of imperfect vaporization. 
     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.