Abstract:
An electronic cigarette includes an absorption stem and a power source stem; the absorption stem has a first and second absorption stem electrodes contained therein; the power source stem has a first and second power source stem electrodes contained therein; when the absorption stem and power source stem are connected with each other, the first absorption stem electrode is electrically connected to the first power source stem electrode, while the second absorption stem electrode is electrically connected to the second power source stem electrode. The absorption stem and power source stem are connected together by magnetic force absorption. The power source stem and absorption stem of the electronic cigarette of the present invention are connected with each other by means of magnetic force absorption, thus leading to easy assembling and disassembling, simple construction, easy repair and replacement, good electrical contact, and long lifetime.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a 35 U.S.C. §371 National Phase conversion of International (PCT) Patent Application No. PCT/CN2013/071370, filed on Feb. 5, 2013, the disclosure of which is incorporated by reference herein. The PCT International Patent Application was filed in Chinese. 
     FIELD OF THE INVENTION 
     The present invention relates to technical field of electronic cigarette and more particularly, relates to an electronic cigarette of which connection is realized by magnetic force absorption. 
     BACKGROUND OF THE INVENTION 
     With more concerns given to people health, people have been aware of damages of tobacco to body health and as a result, electronic cigarette appears. For an electronic cigarette, cigar liquid is atomized by the atomizer such that the user can smoke. During formation process of cigar liquid, hazardous substance such as nicotine and tar is removed from cigar liquid; damage to user&#39;s body health is greatly decreased. Also, as no hazardous substance such as nicotine and tar is contained in cigar liquid, using of the electronic cigarette will gradually reduce reliance of user on traditional cigarette. Therefore, electronic cigarette may also assist in getting rid of smoking. 
     In general, an electronic cigarette includes an absorption stem and a power source stem. A cigar liquid cup for storage of cigar liquid and an atomizer for atomizing cigar into smoke are disposed in the absorption stem. A battery for supplying power to the atomizer is contained in the power source stem. For a conventional electronic cigarette, the absorption stem and power source stem are connected with each other by screwing. This kind of connection will result in time consumption and inconvenience during assembling and disassembling process. In addition, the internal construction of the absorption stem is complex thus leading to inconvenience in maintenance and replacement of the atomizer. Moreover, using of the screwing connection will result in misalignment between the electrode of the power source stem and that of the absorption stem due to bias between the electrodes during contact of the electrodes. Too tight or too loose screwing will both easily result in misalignment. After a period of use, the misalignment will become serious and, bad contact between the electrodes will be caused and accordingly, the atomizer will not work normally. 
     Therefore, there is need for providing an electronic cigarette which is easy to be assembled and disassembled, has simple construction, easy to be repaired and replaced, has good electrical contact, and has long lifetime. 
     SUMMARY OF THE INVENTION 
     The object of the invention is to provide an electronic cigarette which is easy to be assembled and disassembled and has simple construction. 
     To realize the above object, the following technical solution is proposed. The invention provides an electronic cigarette including an absorption stem and a power source stem. The absorption stem has a first and second absorption stem electrodes contained therein. The power source stem has a first and second power source stem electrodes contained therein. When the absorption stem and power source stem are connected with each other, the first absorption stem electrode is electrically connected to the first power source stem electrode, while the second absorption stem electrode is electrically connected to the second power source stem electrode. The absorption stem and power source stem are connected together by magnetic force absorption. In the present invention, the absorption stem and power source stem are connected together by magnetic force absorption and therefore, it has simple construction, is easy to be assembled and disassembled, and is easy to be maintained and replaced. 
     Furthermore, a magnetic absorption element is disposed in at least one of the connection end of the absorption stem and connection end of the power source stem. The connection end of the absorption stem is provided with a metal absorption stem connection member, while the connection end of the power source stem is provided with a metal power source stem connection member. The absorption stem connection member and power source stem connection member are detachably connected with each other, and they are engaged with each other by absorption force of the magnetic absorption element. 
     The magnetic absorption element may take various forms and in some embodiments, it may be permanent magnet. The absorption stem connection member and power source stem connection member are attracted together and are pressed against the top end of the permanent magnet. 
     Furthermore, the permanent magnet is held in the absorption stem connection end or power source stem connection end by a metal holding sleeve. The metal holding sleeve may be made of conductive material such as iron and copper. 
     Moreover, the permanent magnet is disposed on the power source stem connection end and a fixation hole is defined in the permanent magnet. The first power source stem electrode is received in the fixation hole of the permanent magnet. An insulation member is disposed between the permanent magnet and the first power source stem electrode. The power source stem connection member is the second power source stem electrode, and the absorption stem connection member is the second absorption stem electrode. The first absorption stem electrode is placed in the absorption stem connection member. An insulation member is disposed between the first and second absorption stem electrodes. 
     Moreover, the holding sleeve is of a circular cup and includes a side wall, a bottom wall and a cavity defined by the side wall and bottom wall together. The holding sleeve is pressed against and secured on an inner wall of the power source stem connection end by its side wall. A locating step is formed on inner side of the inner wall of the holding sleeve for supporting the permanent magnet. The permanent magnet is installed in the cavity of the holding sleeve and the bottom of the permanent magnet is supported on the locating step. One end of the power source stem connection member and one end of the absorption stem connection member are inserted into the holding sleeve and pressed against the top end of the permanent magnet such that the permanent magnet is held in place. A through hole is defined in the bottom wall of the holding sleeve through which the first power source stem electrode passes. 
     Preferably, the power source stem connection member is pressed against and secured on the power source stem connection end by the holding sleeve and, the holding sleeve is pressed against and secured on the inner wall of the power source stem connection end. The permanent magnet is held in the holding sleeve. 
     Furthermore, the power source stem connection member includes a first connection portion of cylinder in which a first cavity is formed for insertion with the absorption stem connection member. A locating step, which is radially outwardly extended from an outer wall of the first connection portion and used for engaging with the power source stem connection end, is provided on the outer wall of the first connection portion. The power source stem connection member is pressed against and secured on the inner wall of the power source stem connection end by the outer wall of the first connection portion. Using the above structure, the power source stem connection member is simply coupled with the absorption stem connection member. 
     In some embodiments, the power source stem connection member further includes a second connection portion for insertion with the absorption stem connection end. The second connection portion extends axially upon the locating step away from the first connection portion such that a cylinder is formed. The first and second connection portions communicate with each other. A second cavity is defined in the second connection portion for containing the absorption stem connection end. The inner wall of the second connection portion is interference-fitted with the outer wall of the absorption stem connection end. This structure enhances connection reliability between the absorption stem and power source stem, makes connection easy and, produces good electrical contact between the electrodes of the absorption stem and power source stem. 
     Preferably, the absorption stem connection member includes an upper portion and a lower portion both of which are of a cylindrical shape. The upper portion is intended for connection with the absorption stem connection end, whereas the lower portion is intended for connection with the power source stem connection member. A locating step, which is extended outwardly and is pressed against the absorption stem connection end, is formed between the upper and power portions. The locating step also functions to be pressed against the power source stem connection member so as to realize location limiting purpose. A locking ring for mounting the first absorption stem electrode is formed on the inner wall of the lower portion. The first absorption stem electrode is secured in the locking ring by an insulation member. A venting hole is defined in the middle portion of the first absorption stem electrode. The outer wall of the upper portion of the absorption stem connection member is pressed against and inserted into the inner wall of the absorption stem connection end. The power portion of the absorption stem connection member is inserted into the power source stem connection member for engaging the same. This construction makes the absorption stem connection end and power source stem connection end be connected more tightly. 
     Preferably, the first power source stem electrode is of a cylindrical shape. A circular locating step is formed on the middle circumferential surface of the first power source stem electrode and said locating step divides the first power source stem electrode into an upper portion and a lower portion. In addition, an axially extended venting hole is defined in the first power source stem electrode. 
     Preferably, the insulation member is sleeved on the first power source stem electrode and, the first power source stem electrode and insulation member are inserted into the fixation hole of the permanent magnet and are locked therein. The bottom portion of the insulation member is pressed against the top portion of the locating step such that the locating step of the first power source stem electrode is located below the bottom portion of the permanent magnet and is isolated from the permanent magnet. 
     Moreover, an insulation washer is disposed between the first power source stem electrode and holding sleeve. An axially extended venting hole is defined in the middle portion of the insulation washer. The lower portion of the first power source stem electrode passes through the venting hole of the insulation washer and through hole of the holding sleeve and then extends out of the bottom wall of the holding sleeve. The insulation washer isolates the first power source stem electrode from the holding sleeve. 
     Further, a resilient member is sleeved on the lower portion of the first power source stem electrode. The two ends of the resilient member are respectively pressed against the locating step of the first power source stem electrode and insulation washer. The first power source stem electrode, permanent magnet, power source stem connection member and holding sleeve are engaged each other tightly due to pre-tension generated by compression of the resilient member. In addition, the resilient member makes the permanent magnet be pressed more tightly against both of the power source stem connection member and absorption stem connection member, thus leading to more stable connection structure, tighter physical and electrical contact between the first power source stem electrode and the first absorption stem electrode. Generally, the resilient member is a spring. 
     As an alternative embodiment, the permanent magnet may also be disposed at the absorption stem connection end. The fixation hole of the permanent magnet receives the first absorption stem electrode. An insulation member is provided between the permanent magnet and first absorption stem electrode. The absorption stem connection member is the second absorption stem electrode, while the power source stem connection member is the second power source stem electrode. The first power source stem electrode is disposed at the middle portion of the power source stem connection member. An insulation member is disposed between the first and second power source stem electrodes. The substantial features of this embodiment are consistent with those of the above-mentioned embodiment and therefore, no further description will be provided hereinafter. 
     As an alternative embodiment, in addition to the permanent magnet, the magnetic absorption element may also be made of electromagnetic coil assembly. The absorption stem connection member and power source stem connection member are attracted together and are pressed against the top end of the electromagnetic coil assembly. 
     Furthermore, the electromagnetic coil assembly is secured in the absorption stem connection end or power source stem connection end by a base. 
     In some embodiments, the electromagnetic coil assembly is placed inside the power source stem connection end and the electromagnetic coil assembly includes a magnetic core and a coil enwound on the magnetic core. A through hole is defined in the magnetic core. A groove is defined in the outer wall of the magnetic core for enwinding the coil thereon. A radially extended locating step is defined in the upper end of the magnetic core. The first power source stem electrode is inserted into the through hole of the magnetic core. An insulation sleeve is located between the magnetic core and first power source stem electrode. The power source stem connection member is used as the second power source stem electrode. 
     Further, the insulation sleeve is of a cylindrical shape. A circular locating step is formed on the middle circumferential surface of the insulation sleeve and said locating step divides the insulation sleeve into an upper portion and a lower portion. In addition, an axially extended venting hole is defined in the insulation sleeve. A receiving chamber is defined in the lower portion of the insulation sleeve for communicating with the through hole. The first power source stem electrode is inserted into the through hole of the insulation sleeve. The locating step of the insulation sleeve is located between the electromagnetic coil assemble and base and isolates them from each other. 
     Preferably, the first power source stem electrode is of a cylindrical shape. A circular locating step is formed on the middle circumferential surface of the first power source stem electrode and said locating step divides the first power source stem electrode into an upper portion and a lower portion. In addition, an axially extended venting hole is defined in the first power source stem electrode. The insulation sleeve is sleeved on the first power source stem electrode and, the first power source stem electrode and insulation sleeve are inserted into the through hole of the electromagnetic coil assembly and are locked therein. The lower portion of the first power source stem electrode is received into the receiving chamber of the lower portion of the insulation sleeve. The locating step of the first power source stem electrode is pressed against the bottom end of the upper portion of the insulation sleeve. 
     Preferably, the base is of a circular cup and includes a side wall, a bottom wall and a cavity defined by the side wall and bottom wall together. The base is pressed against and secured on an inner wall of the power source stem connection end by its outer wall. A locating step is inwardly formed on the upper end of the side wall of the base. A through hole is defined in the bottom wall of the base through which the first power source stem electrode passes. 
     Preferably, an axially extended semi-circular stopping wall is formed on the bottom wall of the base around the through hole. The stopping wall separates an electric wire for connecting with the first power source stem electrode from another electric wire for connecting with the power source stem connection member. 
     Furthermore, a resilient member is sleeved on the lower portion of the first power source stem electrode. The two ends of the resilient member are respectively pressed against the locating step of the first power source stem electrode and inner side of the bottom wall of the base. The first power source stem electrode, permanent magnet, power source stem connection member and base are engaged each other tightly due to pre-tension generated by compression of the resilient member. In addition, the resilient member makes the electromagnetic coil assembly be pressed more tightly against both of the power source stem connection member and absorption stem connection member, thus leading to more stable connection structure, tighter physical and electrical contact between the first power source stem electrode and the first absorption stem electrode. Generally, the resilient member is a spring. 
     Moreover, the power source stem connection member is of a cylindrical shape and, a locating step extended radially outwardly is formed on the upper end thereof for engaging the power source stem connection end. The side wall of the power source stem connection member is divided into an upper portion for receiving the absorption stem connection member and a lower portion for receiving the electromagnetic coil assembly, the first power source stem electrode and base. The transition location between the upper portion and lower portion of the side wall of the power source stem connection member is provided with a step against which the upper end surface of the magnetic core of the electromagnetic coil assembly is pressed. 
     Preferably, the outer diameter of the upper portion of the side wall of the power source stem connection member becomes gradually greater such that the power source stem connection member is secured into the inner wall of the power source stem connection end. The lower end of the power source stem connection member is provided with two wiring pins for wiring. 
     Preferably, the absorption stem connection member includes an upper portion and a lower portion both of which are of a cylindrical shape. The upper portion is intended for connection with the absorption stem connection end, whereas the lower portion is intended for connection with the power source stem connection member. A locating step, which is extended radially outwardly and is pressed against the absorption stem connection end, is formed between the upper and power portions. The locating step also functions to be pressed against the power source stem connection member so as to realize location limiting purpose. A locking ring for mounting the first absorption stem electrode is formed on the inner wall of the lower portion. The first absorption stem electrode is secured in the locking ring by an insulation member. A venting hole is defined in the middle portion of the first absorption stem electrode. 
     Furthermore, the insulation ring is disposed between the first absorption stem electrode and locking ring of the absorption stem connection member. One end of the insulation ring is provided with inverted rim to be located at one side of the locking ring, while the other end thereof is provided with radially extended cylindrical boss to be located at the other side of the locking ring, hereby the insulation ring being just locked in the locking ring of the absorption stem connection member. 
     As an alternative embodiment, the electromagnetic coil assembly may also be placed inside the absorption stem connection end and the electromagnetic coil assembly includes a magnetic core and a coil enwound on the magnetic core. A through hole is defined in the magnetic core. A groove is defined in the outer wall of the magnetic core for enwinding the coil thereon. A radially extended locating step is defined in the upper end of the magnetic core. The first absorption stem electrode is inserted into the through hole of the magnetic core. An insulation sleeve is located between the magnetic core and first absorption stem electrode. The absorption stem connection member is used as the second absorption stem electrode. The substantial features of this embodiment are consistent with those of the above-mentioned embodiment and therefore, no further description will be provided hereinafter. 
     Compared with prior art, the invention has the following advantages: the power source stem and absorption stem of the electronic cigarette of the present invention are connected with each other by means of magnetic force absorption, thus leading to easy assembling and disassembling, simple construction, easy repair and replacement, good electrical contact, and long lifetime. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a front view of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 2  shows a cross-sectional view of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 3  shows an exploded view of an absorption stem of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 4  shows an exploded view of an absorption stem of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 5  shows a cross-sectional view of a power source stem of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 6  shows an exploded view of a power source stem of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 7  shows a cross-sectional view of a nozzle case of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 8  shows a cross-sectional view of a cigar liquid cup base of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 9  shows a cross-sectional view of an absorption stem connection member of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 10  shows a cross-sectional view of a power source stem connection member of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 11  shows a cross-sectional view of a holding sleeve of an electronic cigarette according to a first embodiment of the invention; 
         FIG. 12  shows a cross-sectional view of an absorption stem connection member of an electronic cigarette according to a second embodiment of the invention; 
         FIG. 13  shows a cross-sectional view of a power source stem connection member of an electronic cigarette according to a second embodiment of the invention; 
         FIG. 14  shows a cross-sectional view of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 15  shows an assembled cross-sectional view of a magnetic force connection head component of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 16  shows a front view of a magnetic force connection head component of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 17  shows a cross-sectional view of a power source stem connection member of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 18  shows a cross-sectional view of an absorption stem connection member of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 19  shows a cross-sectional view of a base of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 20  shows a cross-sectional view of an insulation sleeve of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 21  shows a cross-sectional view of a first power source stem electrode of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 22  shows a cross-sectional view of an insulation ring of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 23  shows a cross-sectional view of an electromagnetic coil assembly of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 24  shows an exploded view of a power source stem of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 25  shows an exploded view of an absorption stem of an electronic cigarette according to a third embodiment of the invention; 
         FIG. 26  shows a cross-sectional view of an electronic cigarette according to a fourth embodiment of the invention; and 
         FIG. 27  illustrates working principle of the electromagnet of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to  FIGS. 1-11  showing a schematic view of the electronic cigarette according to a first embodiment, the electronic cigarette includes an absorption stem  90  and a power source stem  91  which are connected with each other by magnetic force. The absorption stem has a first and second absorption stem electrodes contained therein, while the power source stem has a first and second power source stem electrodes contained therein. When the absorption stem and power source stem are connected with each other, the first absorption stem electrode is electrically connected to the first power source stem electrode, while the second absorption stem electrode is electrically connected to the second power source stem electrode. 
     A magnetic absorption element is disposed in at least one of the connection end of the absorption stem  90  and connection end of the power source stem  91  engaged with the connection end of the stem  91 . In one embodiment, the magnetic absorption element may be permanent magnet. The absorption stem connection member and power source stem connection member are attracted together and are pressed against the top end of the permanent magnet  8 . The connection end of the absorption stem  90  is provided with a metal absorption stem connection member  5 , while the connection end of the power source stem  91  is provided with a metal power source stem connection member  911 . In one embodiment, the absorption stem connection member  5  and power source stem connection member  911  are made of iron. The absorption stem connection member  5  and power source stem connection member  911  are detachably connected with each other, and they are engaged with each other by absorption force of the magnetic absorption element  8 . 
     The permanent magnet  8  is held in the power source stem connection member  911  by an iron holding sleeve  914 . The permanent magnet  8  is of an annular shape and a fixation hole is defined in its middle portion. The first power source stem electrode  915  is received in the fixation hole of the permanent magnet  8 . A power source stem insulation member  916  is disposed between the permanent magnet  8  and first power source stem electrode  915 . The power source stem connection member  911  is used as the second power source stem electrode. 
     The absorption stem connection member  5  is the second absorption stem electrode. The middle portion of the absorption stem connection member  5  is provided with the first absorption stem electrode  13 . An absorption stem insulation member  14  is disposed between the first absorption stem electrode  13  and the second absorption stem electrode. 
     The power source stem connection member  911  and absorption stem connection member  5  may each be stand-alone component independent of power source stem  91  or absorption stem  90 . They may also be integral with the power source stem  91  or absorption stem  90 . The holding sleeve  914  may also be stand-alone component independent of the power source stem  91 , or may be integral with the power source stem  91 . 
     In present embodiment, the absorption stem  90  includes an absorption sleeve  1 , an atomization device  2 , a cigar liquid cup  3 , a nozzle case  4  and an absorption stem connection member  5  for connecting with the power source stem  91 . The nozzle case  4  and absorption stem connection member  5  are mounted at two ends of the absorption sleeve  1  respectively. The atomization device  2  and cigar liquid cup  3  are installed in the absorption sleeve  1 . 
     The absorption sleeve  1  is of a hollow cylindrical construction and is made of transparent or semitransparent plastic material or made of metal enclosure. As shown in  FIGS. 2 and 3 , the absorption sleeve  1  includes a first end  11  for placement of the nozzle case  4  and a second end  12  for placement of the absorption stem connection member  5 . The first absorption stem electrode  13  and absorption stem insulation ring  14  are received in the absorption stem connection member  5  located on the second end  12 . A venting hole is defined in the middle portion of the first absorption stem electrode  13 . 
     As shown in  FIGS. 2-6 , the atomization device  2  includes an atomizer  21 , an atomizer control circuit board  22  and a circuit board holding base  23  for accommodating and holding the atomizer control circuit board  22 . The atomizer  21  is placed in the absorption sleeve  1 , while the atomizer control circuit board  22  and circuit board holding base  23  are placed in the power source stem  91 . The atomizer control circuit board  22  is provided with a mini pneumatic switch for control conduction of the electric circuit such that the atomizer  21  starts to work. 
     As shown in  FIG. 3 , the atomizer  21  is intended to change cigar liquid into smoke and it includes an electric heater coil  211  and a fiber member  212  for supporting the electric heater coil  211  and absorbing cigar liquid. The electric heater coil  211  is enwound on the fiber member  212 . The fiber member  212  works like sponge so as to absorb and store cigar liquid, and may be made of material with good liquid absorption and storage ability such as glass fiber or cotton thread. The fiber member  212  is contained and secured in the cigar liquid cup  3 . The two ends of the electric heater coil  211  pass through the cigar liquid cup  3  and then are connected with the two electrodes inside the power source stem  91 . 
     As shown in  FIGS. 3-4 , the cigar liquid cup  3  includes a cup base  31 , a guiding tube  35 , a liquid storage component  37 , a locating tube  39  and the above-mentioned nozzle case  4 . The cup base  31  and nozzle case  4  are disposed opposite to each other, distanced from each other, and are held in the inner wall of the absorption sleeve. The guiding tube  35  is held between the cup base  31  and nozzle case  4 . The liquid storage component  37  is secured on the periphery of the guiding tube  35  and is disposed between the cup base  31  and nozzle case  4 . The locating tube  39  is sleeved on the outer wall of the guiding tube  35  and is pressed against the atomizer  21  for preventing axial movement of the atomizer  21 . 
     As shown in  FIG. 8 , the cup base  31  is of a cylindrical cup construction and includes an annular side wall  318  and a circular cup bottom  319 , a locating post  311  axially extended from the middle portion of the cup bottom  319 . Herein, an annular cavity  317  is defined between the annular side wall  318  and locating post  311 . A cup bottom venting hole  312  is defined which extends axially through the locating post  311  and cup bottom  319 . Two wire guiding holes (not shown) are defined in the cup bottom  319  for passing the electric heater coil  211 . An expansion ring  314  is disposed on the outer side of the side wall  318  for pressing against the absorption sleeve  1 . The cup base  31  is pressed against and secured in the inner wall of the absorption sleeve  1  by its side wall  318  and expansion ring  314 . 
     The nozzle case  4  may be formed of silica gel, and its shape and size are consistent with the inner wall of the absorption sleeve  1 . As shown in  FIG. 7 , the nozzle case  4  may take on cylindrical cover body, and includes an annular side wall  48 , a top wall  48  and a locating post  41  axially extended from the middle portion of the top wall  49 . An annular cavity  47  is defined by the locating post  41  and side wall  48 . The nozzle case  4  further includes a nozzle case venting hole  42  axially extending through the locating post  41  and top wall  49 , and a locating step  43  radially outwardly extended and matched with the first end  11  of the absorption sleeve  1 . The outer diameter of the nozzle case  4  is slightly larger than the inner diameter of the absorption sleeve  1 . The nozzle case  4  is pressed against and secured on the inner wall of the absorption sleeve  1  by its side wall  48 . When the cigar liquid inside the cigar liquid cup  3  gives out, cigar liquid may be added into the cigar liquid cup  3  after the nozzle case  4  is removed. The locating post  41  of the nozzle case  4  is corresponding to the locating post  311  of the cup base  31 , while the annular cavity  47  of the nozzle case  4  is corresponding to the annular cavity  317  of the cup base  31 , for receiving respectively the two ends of the guiding tube  35  and two ends of the liquid storage component  37 . 
     As shown in  FIG. 4 , the guiding tube  35  is used to support the liquid storage component  37  and, it is also used to control height of the cigar liquid cup  3  and support the fiber member  212 . In addition, it is also used as a path for conducting smoke generated by atomization of cigar liquid by the atomizer  21  out of the absorption sleeve  1 . The guiding tube  35  is a hollow circular tube and is made of plastic or fiber material such as a glass fiber tube. The guiding tube  35  includes an upper portion and a lower portion. The upper portion of the guiding tube  35  is sleeved on the locating post  41  of the nozzle case  4  and is sealably connected with the circumference of the locating post  41  of the nozzle case  4 . The lower portion of the guiding tube is sleeved on the locating post  311  of the cup base  31  and is sealably connected with the circumference thereof. A holding groove  351  is defined in the guiding tube  35  and extends through its tube wall for supporting and securing the fiber member  212 . The fiber member  212  transverses the two ends of the guiding tube  35 , passes through the holding groove  351  and contacts the liquid storage component  37  so as to absorb cigar liquid which will be atomized by the electric heater coil  211 . 
     Referring to  FIGS. 3 and 4 , the liquid storage component  37  serves to absorb and stores cigar liquid injected into the cigar liquid cup  3  such that the liquid later will be atomized by the atomizer  21 . The liquid storage component  37  works like sponge so as to absorb and store cigar liquid, and may be made of material with good liquid absorption and isolation ability such as cotton material. The liquid storage component  37  is of a hollow cylindrical construction and is sleeved on the outside of the guiding tube  35  and is pressed against and supported on the outer wall of the guiding tube  35 . The two ends of the liquid storage component  37  are inserted into the annular cavity  317  of the cup base  31  and annular cavity  47  of the nozzle case  4  respectively. The side wall of the liquid storage component  37  is pressed against the fiber member  212 . Cigar liquid soaks into the fiber member  212  from the liquid storage component  37  and then is absorbed and finally vaporized by the electric heater coil  211  thus producing smoke. 
     As shown in  FIG. 3 , the locating tube  39  is used to limit location of the atomizer  21  on a guide rail  35 . The locating tube  39  is a hollow insulated circular tube matched with the guiding tube  35 , and may be made of plastic or fiber material such as glass fiber tube. The locating tube  39  is sleeved on the outer wall of the guiding tube  35 . Interference fit exists between the locating tube  39  and guiding tube  35 . The bottom end of the locating tube  35  is pressed against the atomizer  21  so as to prevent axial displacement of the atomizer  21  along the guiding tube  35 . 
     As shown in  FIGS. 3, 4 and 9 , the absorption stem connection member  5  is located at the second end  12  of the absorption sleeve  1  and its shape corresponds to the absorption sleeve  1 , and is made of magnetic material such as iron. The absorption stem connection member  5  is inserted into the absorption sleeve  1  and contacts the cup base  31 . The absorption stem connection member  5  is substantially of a hollow cylinder, and includes a cylindrical upper portion  51  and a cylindrical lower portion  52 . The upper portion  51  is intended for connection with the absorption stem connection end (i.e., the second end  12  of the absorption sleeve  1 ), whilst the lower portion  52  is intended for connection with the power source stem connection member. A radially outwardly extended locating step  53  is formed between the upper portion  51  and lower portion  52  for contacting the absorption stem connection end. The locating step  53  also functions to be pressed against the power source stem connection member for purpose of limiting position. A locking ring  54  for mounting the first absorption stem electrode  13  is formed on the inner wall of the lower portion  52 . The first absorption stem electrode  13  is held in the locking ring  54  by the absorption stem insulation member  14 . A venting hole is defined in the middle portion of the first absorption stem electrode  13 . The outer wall of the upper portion  51  of the absorption stem connection member  5  is inserted into and pressed against the inner wall of the absorption stem connection end. The lower portion  52  of the absorption stem connection member is inserted into the power source stem connection member. This construction makes the absorption stem connection end and power source stem connection end engage with each other tightly. 
     Referring to  FIGS. 5 and 6 , the power source stem  91  includes a sleeve  910 , a power source stem connection member  911  and a base cover  912  which are disposed at two ends of the sleeve  910  respectively, a battery  913  received in the sleeve  910 , a holding sleeve  914  for holding the power source stem connection member  911  into the sleeve  910  and a first power source stem electrode  915  electrically connected with an electrode of the battery  913 . The holding sleeve  914  is placed in the power source stem  91  and is used as part of the power source stem  91 . The power source stem  91  also includes a permanent magnet  8  by which the power source stem connection member  911  will produce magnetic force such that the member  911  will be connected with the absorption stem connection member  5  through magnetic force absorption. In present embodiment, the permanent magnet  8  is an electromagnet and the shape thereof is consistent with the holding sleeve  910 . The shape of the electromagnet is of a circular shape. A fixation hole  81  is defined in the middle portion of the permanent magnet  8 . A power source stem insulation member  916  is disposed between the permanent magnet  8  and the first power source stem electrode  915 . Protrusion bars  9121  for being pressed against the sleeve  910  and intake holes  9122  are provided on the base cover  912 . 
     As shown in  FIG. 11 , the holding sleeve  914  is of a cylindrical cup shape and includes a side wall  9148 , a bottom wall  9149  and a cavity  9147  defined by the side wall  9148  and bottom wall  9149 . The holding sleeve  914  is pressed against and secured on the inner wall of the sleeve  910  by its side wall  9148 . A locating step  9141  is formed on inner side of the inner wall  9148  of the holding sleeve for supporting the permanent magnet  8 . The permanent magnet  8  is installed in the cavity of the holding sleeve  914  and the bottom of the permanent magnet  8  is supported on the locating step  9141 . One end of the power source stem connection member and one end of the absorption stem connection member are inserted into the holding sleeve  914  and pressed against the top end of the permanent magnet  8  such that the permanent magnet  8  is held in place. A through hole  9142  is defined in the bottom wall  9149  of the holding sleeve. An insulation washer  918  is disposed between the first power source stem electrode  915  and holding sleeve  914 . An axially extended venting hole is defined in the middle portion of the insulation washer  918 . The lower portion of the first power source stem electrode  915  passes through the venting hole of the insulation washer  918  and through hole  9142  of the holding sleeve and then extends out of the bottom wall  9149  of the holding sleeve  914  for ventilation. The insulation washer  918  isolates the first power source stem electrode  915  from the holding sleeve  914 . The holding sleeve  914  is a conductive member made of metal material, and it contacts the power source stem connection member  911  so as to conduct electricity. 
     Referring to  FIG. 10 , the power source stem connection member  911  matches the absorption stem connection member  5  and is made of magnetic material such as iron. The power source stem connection member  911  is disposed at the top end of the sleeve  910  for connecting the power source stem  91  and absorption stem  90 . The power source stem connection member  911  is substantially of a hollow cylindrical shape and includes a first connection portion  9111  of cylinder in which a first cavity  9112  is formed for insertion with the lower portion  52  of the absorption stem connection member  5 . A locating step  9113 , which is radially outwardly extended from an outer wall of the first connection portion  9111  and used for engaging with the sleeve  910 , is provided on the outer wall of the first connection portion  9111 . The power source stem connection member  911  is pressed against and secured on the inner wall of the sleeve  914  by the outer wall of the first connection portion  9111  and is also pressed and secured on the inner wall of the sleeve  910  by the holding sleeve  914 . The power source stem connection member  911  is used as the second power source stem electrode. 
     Referring to  FIGS. 5 and 6 , the first power source stem electrode  915  is substantially of a cylindrical shape. A circular locating step  9153  is formed on the middle circumferential surface of the first power source stem electrode  915  and said locating step  9153  divides the first power source stem electrode  915  into an upper portion  9151  and a lower portion  9152 . In addition, an axially extended venting hole  9154  is defined in the first power source stem electrode. A power source stem insulation member  916  is sleeved on the upper portion  9151  of the first power source stem electrode and, they are inserted into the fixation hole  81  of the permanent magnet  8  and are locked therein. The bottom portion of the power source stem insulation member  916  is pressed against the top portion of the locating step  9153  such that the locating step  9153  of the first power source stem electrode is located below the bottom portion of the permanent magnet and the first power source stem electrode  915  is isolated from the permanent magnet  8 . 
     A resilient member  917  is sleeved on the lower portion  9152  of the first power source stem electrode  915 . In present embodiment, the resilient member is a spring. The two ends of the resilient member  917  are respectively pressed against the bottom surface of the locating step  9153  of the first power source stem electrode  915  and insulation washer  918 . The first power source stem electrode  915 , permanent magnet  8 , power source stem connection member  911  and holding sleeve  914  are engaged each other tightly due to pre-tension generated by compression of the resilient member  917 . In addition, the resilient member  917  makes the permanent magnet  8  being pressed more tightly against both of the power source stem connection member  911  and absorption stem connection member  5 . By this manner, the first power source stem electrode  915  is always held and secured in the insulation ring  916  and no loosening occurs. The insulation washer  918  is capable of preventing short circuit between the first power source stem electrode  915  and holding sleeve  914 . The resilient member  917  is pressed against the insulation washer  918  so as to prevent contact between the resilient member  917  and holding sleeve  914  which otherwise will result in electrical conduction. 
     During assembly of the electronic cigarette, the absorption stem connection member  5  is inserted into the power source stem connection member  911 . Due to the existence of the permanent magnet  8 , the absorption stem connection member  5  will be absorbed by the permanent magnet  8  and be pressed against the permanent magnet  8 . Absorption force also exists between the power source stem connection member  911  and absorption stem connection member  5  and accordingly, tight connection between the absorption stem  90  and power source stem  91  is realized. When disassembling, what is needed is to overcome magnetic force so as to draw the absorption stem  90  out of the power source stem  91 . This kind of connection leads to easiness and convenience in assembling and disassembling the electronic cigarette. Before the electronic cigarette is inserted and works, cigar liquid soaks and is storage into the fiber member  212  from the liquid storage component  37 . During working process, the electrical circuit is switched on such that current flows across the electric heater coil  211  of the atomizer  21  and heat is generated. The cigar liquid stored in the fiber member  212  is heated and atomized by the electric heater coil  211  so that smoke is produced. The smoke passes through the guiding tube  35 , then passes through the nozzle case  4  of the nozzle case venting hole  42  and finally be absorbed into mouth of the smoker. 
     Referring to  FIGS. 12 and 13  and according to a second embodiment of the invention, the power source stem  91 ′ has similar construction to the power source stem  91  of the first embodiment and the difference lies in change of the power source stem connection member  911 ′ of the power source stem  91 ′. The power source stem connection member  911 ′ is substantially of a hollow cylindrical shape and includes a first connection portion  9111 ′ of cylinder in which a first cavity  9112 ′ is formed for insertion with the lower portion  52  of the absorption stem connection member  5 . A locating step  9113 ′, which is radially outwardly extended and used for engaging with the sleeve  910 , is provided on the outer wall of the first connection portion  911 ′. The power source stem connection member  911 ′ is pressed against and secured on the inner wall of the holding sleeve  914  by the outer wall of the first connection portion  9111 ′. Further, it is also pressed against and secured on the inner wall of the sleeve  910  by the holding sleeve  914 . The power source stem connection member  911 ′ further includes a second connection portion  9114 ′ for engaging the absorption stem connection end. A cylinder is formed by extending axially away from the first connection portion  9111 ′ from the locating step  9113 ′ of the second connection portion  9114 ′. The first connection portion  9111 ′ and second connection portion  9114 ′ are communicated with each other. A second cavity  9115 ′ is defined in the second connection portion  9114 ′ for receiving the absorption stem connection end (the second end  12  of the absorption sleeve of the absorption stem). The inner wall of the second connection portion  9114 ′ is interference-fitted with the outer wall of the absorption stem connection end such that the connection between the absorption stem  90  and power source stem  91  becomes more reliable. 
     Though various embodiments have been described, the scope of the invention is not limited to them. The permanent magnet  8  may be disposed in the power source stem  91 . Understandingly, the permanent magnet  8  may also be disposed in the absorption stem  90 . The first absorption stem electrode  13  is inserted into the fixation hole of the permanent magnet. An insulation member is disposed between the permanent magnet and first absorption stem electrode. The absorption stem connection member is the second absorption stem electrode. The power source stem connection member is the second power source stem electrode. The first power source stem electrode is provided in the power source stem connection member. An insulation member is disposed between the first and second power source stem electrodes. The present invention may also be embodied as follows. Both of the absorption stem  90  and power source stem  91  are provided with a permanent magnet  8 . When connecting the absorption stem connection member and power source stem connection member, the permanent magnets  8  thereof are attracted with each other. The substantial structure of this embodiment is consistent with that of the above embodiment and therefore, no further description will be provided hereinafter. 
     Referring to  FIGS. 14-26 , as an alternative embodiment, in a third embodiment, an electromagnetic coil assembly  613  is employed to replace the permanent magnet. The absorption stem connection member  711  and power source stem connection member  611  are attracted together and are pressed against the top end of the electromagnetic coil assembly  613 . In this embodiment, the electromagnetic coil assembly  613  is held in the power source stem connection member  611  via a base  614 . 
     Referring to  FIGS. 23-24 , the electromagnetic coil assembly  613  includes a magnetic core  6131  and a coil  6132  enwound on the magnetic core. A through hole  6133  is defined in the magnetic core  6131 . A groove (not shown) is defined in the outer wall of the magnetic core  6131  for enwinding the coil thereon. A radially extended locating step  6134  is defined in the upper end of the magnetic core  6131 . The first power source stem electrode  615  is inserted into the through hole  6133  of the magnetic core. An insulation sleeve  616  is located between the magnetic core  6133  and first power source stem electrode  615 . The power source stem connection member  611  is used as the second power source stem electrode. The coil  6132  may be made of copper. The magnetic core may be formed by soft magnetic material such as any one or more of pure iron and soft steel, Fe—Si material, Fe—Al type material, Fe—Si—Al type material, Fe—Ni type material, Fe—Co type material, soft ferrite material, amorphous soft magnetic material, and nana-crystalline soft magnetic material. 
     Referring to  FIG. 20 , the insulation sleeve  616  is of a cylindrical shape. A circular locating step  6161  is formed on the middle circumferential surface of the insulation sleeve  616  and said locating step divides the insulation sleeve  616  into an upper portion  6162  and a lower portion  6163 . In addition, an axially extended venting hole  6164  is defined in the insulation sleeve  616 . A receiving chamber  6165  is defined in the lower portion of the insulation sleeve. The first power source stem electrode  615  is inserted into the through hole  6164  of the insulation sleeve. The locating step  6161  of the insulation sleeve is located between the electromagnetic coil assemble  613  and base  614  and isolates them from each other. 
     Referring to  FIG. 21 , the first power source stem electrode  615  is of a cylindrical shape. A circular locating step  6151  is formed on the middle circumferential surface of the first power source stem electrode and said locating step  6151  divides the first power source stem electrode into an upper portion  6152  and a lower portion  6153 . In addition, an axially extended venting hole  6151  is defined in the first power source stem electrode  615 . The insulation member  616  is sleeved on the upper portion  6152  of the first power source stem electrode and, the first power source stem electrode and insulation member are inserted into the through hole  6133  of the electromagnetic coil assembly and are locked therein. The lower portion  6153  of the first power source stem electrode is received into the receiving chamber  6165  of the lower portion  6163  of the insulation sleeve. The locating step  6151  of the first power source stem electrode is pressed against the bottom end of the upper portion  6162  of the insulation sleeve. 
     Referring to  FIG. 19 , the base  614  is of a circular cup and includes a side wall  6141 , a bottom wall  6142  and a cavity  6143  defined by the side wall and bottom wall together. The base  614  is pressed against and secured on an inner wall of the power source stem connection end by its side wall  6141 . A locating step  6144  is inwardly formed on the upper end of the side wall  6141  of the base  614 . A through hole  6145  is defined in the bottom wall of the base  614  through which the first power source stem electrode  615  passes. An axially extended semi-circular stopping wall  6146  is formed on the bottom wall of the base  614  around the through hole  6145 . The stopping wall separates an electric wire for connecting with the first power source stem electrode  615  from another electric wire for connecting with the power source stem connection member  611 . 
     Referring to  FIG. 15 , a spring  617  is sleeved on the lower portion  6153  of the first power source stem electrode. The two ends of the spring  617  are respectively pressed against the locating step  6151  of the first power source stem electrode and inner side of the bottom wall  6142  of the base. The first power source stem electrode  615 , electromagnetic coil assembly  613 , power source stem connection member  611  and base  614  are engaged each other tightly due to pre-tension generated by compression of the spring  617 . In addition, the spring  617  makes the electromagnetic coil assembly  613  be pressed more tightly against both of the power source stem connection member  611  and absorption stem connection member  711 , thus leading to more stable connection structure, tighter physical and electrical contact between the first power source stem electrode  615  and the first absorption stem electrode. 
     Referring to  FIG. 17 , the power source stem connection member  611  is of a cylindrical shape and, a locating step  6111  extended radially outwardly is formed on the upper end thereof for engaging the power source stem connection end. The side wall of the power source stem connection member  611  is divided into an upper portion  6112  for receiving the absorption stem connection member  711  and a lower portion  6113  for receiving the electromagnetic coil assembly  613 , the first power source stem electrode  615  and base  614 . The transition location between the upper portion and lower portion of the side wall of the power source stem connection member is provided with a step  6114  against which the upper end surface of the magnetic core  6131  of the electromagnetic coil assembly is pressed. The outer diameter of the upper portion  6112  of the side wall of the power source stem connection member becomes gradually greater such that the power source stem connection member  611  is secured into the inner wall of the power source stem connection end. The lower end of the power source stem connection member is provided with two wiring pins  6115  for wiring. 
     Referring to  FIG. 18 , the absorption stem connection member  711  includes an upper portion  7111  and a lower portion  7112  both of which are of a cylindrical shape. The upper portion  7111  is intended for connection with the absorption stem connection end, whereas the lower portion  7112  is intended for connection with the power source stem connection member  611 . A locating step  7113 , which is extended outwardly and is pressed against the absorption stem connection end, is formed between the upper and power portions  7111  and  7112 . The locating step also functions to be pressed against the power source stem connection member so as to realize location limiting purpose. A locking ring  7114  for mounting the first absorption stem electrode  712  is formed on the inner wall of the lower portion  7112 . The first absorption stem electrode  712  is secured in the locking ring  7114  by an insulation ring  713 . An axially extended venting hole is defined in the middle portion of the first absorption stem electrode  712 . 
     Referring to  FIG. 22 , the insulation ring  713  is disposed between the first absorption stem electrode  712  and locking ring  7114  of the absorption stem connection member. One end of the insulation ring  713  is provided with inverted rim  7131  to be located at one side of the locking ring  7114 , while the other end thereof is provided with a radially extended cylindrical boss  7132  to be located at the other side of the locking ring  7114 , hereby the insulation ring  713  being just locked in the locking ring  7114  of the absorption stem connection member. 
     Referring to  FIG. 26 , the difference between the fourth embodiment and third embodiment is described as follows. The electromagnetic coil assembly  613  is disposed in the absorption stem connection end and, the electrode construction inside the absorption stem is exchanged with the electrode construction inside the power source stem. The substantial features of this embodiment are consistent with those of the above-mentioned embodiment and therefore, no further description will be provided hereinafter. 
     Referring to  FIG. 27  illustrating work principle of the electromagnetic coil assembly  613  of the invention, the electromagnetic coil assembly  613  may be powered by the electronic cigarette battery  913  or by a separate battery. A sensor  102  disposed in the electronic cigarette acquires relevant information and then commands the controller  101  to control working status of the electromagnetic coil assembly  613 . The information sensed by the sensor  102  may be set according to requirement such as voltage change of the battery, circuit current change, switch off or switch on of the circuit. Or, it may be based on forces applied or whether insertion or pulling out of the magnetic force absorption component is sensed. Based on the information sensed by the sensor  102 , the controller  101  controls the battery  913  so that the battery  913  will supply or cut off the power, thus controlling whether the electromagnetic coil assembly  613  will produce magnetic force, and finally making the absorption stem  90  and power source stem  91  be connected with each other by magnetic force absorption. 
     Though various embodiments of the invention have been illustrated above, a person of ordinary skill in the art will understand that, variations and improvements made upon the illustrative embodiments fall within the scope of the invention, and the scope of the invention is only limited by the accompanying claims and their equivalents.