Abstract:
Disclosed is an electronic cigarette ( 100 ), comprising a cylinder housing ( 1 ), and a liquid storage component ( 37 ) and an atomizer ( 21 ) provided in the housing ( 1 ), wherein an end of the housing ( 1 ) is provided with a suction nozzle cover assembly ( 4, 4′, 4 ″) for suction by a smoker, the suction nozzle cover assembly ( 4, 4′, 4 ″) comprises a suction nozzle primary cover ( 41, 41 ″) and a suction nozzle secondary cover ( 42, 42′, 42 ″) cooperating with the suction nozzle primary cover ( 41, 41 ″), the suction nozzle primary cover ( 41, 41 ″) is inserted into the housing ( 1 ) and fixed to an inner wall of the housing ( 1 ), the suction nozzle secondary cover ( 42, 42 ′) is inserted into and fixed to the suction nozzle primary cover ( 41 ) and alternatively, the suction nozzle secondary cover ( 42 ″) is inserted and fixed to the inner wall of the housing ( 1 ), a cooling cavity is formed between the suction nozzle primary cover ( 41, 41 ″) and the suction nozzle secondary cover ( 42, 42′, 42 ″), and both the suction nozzle primary cover ( 41, 41 ″) and the suction nozzle secondary cover ( 42, 42′, 42 ″) are provided with a ventilation hole ( 412, 421, 421′, 412″, 412 ″) in communication with the cooling cavity. This electronic cigarette can reduce or avoid the possibility of a smoker inhaling cigarette liquid, and improve the safety of use.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to the field of electronic cigarette. 
       BACKGROUND OF THE INVENTION 
       [0002]    Existing electronic cigarette typically includes a cylindrical shaped casing, inside of the casing is equipped with a tobacco-liquid cup for holding tobacco-liquid, an atomizer for atomizing the tobacco-liquid to smoke, and a storage power source for supplying power for the atomizer. A part of the casing is provided with a mouthpiece cover for sucking by smokers, the number of the mouthpiece cover is only one and the thickness of the inner-wall thereof is relatively thin. Since smoke flows out of the electronic cigarette via the mouthpiece cover from the inner of the electronic cigarette, some fine particles of the tobacco-liquid included in the smoke will be sucked into the mouths of the smokers directly, thus a phenomenon that the smokers suck in tobacco-liquid occurs. Moreover, due to the relatively thin wall thickness or the single-wall design of the inner wall of the mouthpiece cover, hot smoke will transfer heat with the mouthpiece cover when flowing through the mouthpiece cover, which leads to a continuous increasing of the mouthpiece temperature, exhibits a potential safety hazard of the mouths of smokers being burnt. In addition, because the tobacco-liquid cup is provided with components such as a cup seat, an atomizer seat etc. inside, this complex inner structure results in time-consuming and inconvenient during assembly and disassembly. 
       SUMMARY OF THE INVENTION 
       [0003]    The object of the present invention is to provide an electronic cigarette, which can reduce or avoid the inhaling of the tobacco-liquid by smokers, and improve safety in utilization. 
         [0004]    To achieve the above object, the present invention provides an electronic cigarette including a cylindrical casing in which is provided with a liquid-storage member for storing tobacco-liquid and an atomizer for atomizing to transform the tobacco-liquid into smoke. Wherein one end of the casing is provided with a mouthpiece cover component for sucking by smokers, the mouthpiece cover component including a mouthpiece main cover and a mouthpiece vice cover used in combining with the mouthpiece main cover. The mouthpiece main cover is inserted in the casing and fixed to the inner wall of the casing, the mouthpiece vice cover is inserted and fixed in the mouthpiece main cover or the mouthpiece vice cover is inserted in and fixed to the inner wall of the casing. A cooling cavity for cooling the fine tobacco-liquid particles contained in the smoke on the inner wall thereof and allowing for as the smoke flowing through and transferring heat with the mouthpiece main cover and the mouthpiece vice cover the heat being absorbed by the both as a share, is formed between the mouthpiece main cover and the mouthpiece vice cover. The mouthpiece main cover and the mouthpiece vice cover both have vent holes communicating with the cooling cavity provided thereon. 
         [0005]    Wherein the mouthpiece vice cover is inserted and fixed in the mouthpiece main cover. 
         [0006]    Wherein the mouthpiece main cover includes a cylindrical main cover body formed by combination of a bottom wall and a side wall and comprising a cooling cavity, an insertion peg is formed on the bottom wall of the mouthpiece main cover and axially extends outward, the vent hole of the mouthpiece main cover is located in the middle of the insertion peg and perforates the insertion peg, a locating rim matching the casing is formed on the top end outer wall of the mouthpiece main cover and radially extends outward; the mouthpiece vice cover is inserted in the main cover cooling cavity of the mouthpiece main cover and tensionally fitted to the side wall of the main cover cooling cavity. 
         [0007]    Wherein the mouthpiece vice cover includes a cylindrical vice cover body formed by combination of a top wall and a side wall and comprising a vice cover cooling cavity, a vent hole is provided on the top wall of the vice cover body and axially perforates to allow for venting between the inside and outside of the vice cover cooling cavity. 
         [0008]    Wherein the mouthpiece vice cover includes a cylindrical vice cover body formed by combination of a top wall and a side wall and comprising a vice cover cooling cavity, a vent hole is provided on the top wall of the vice cover body and axially perforates to allow for venting between the inside and outside of the vice cover cooling cavity; the bottom of the vice cover body extends outward to form an insertion peg for inserting with the main cover cooling cavity of the mouthpiece main cover, the inside of the insertion peg is provide with a through hole communicating with the vice cover cooling cavity. 
         [0009]    Wherein the mouthpiece vice cover is inserted in and fixed to the inner wall of the casing. 
         [0010]    Wherein the mouthpiece main cover includes a main cover body tensionally engaging with the inner side wall of the casing, the bottom of the main cover body axially extends outward to form an insertion peg, the vent hole of the mouthpiece main cover is located in the middle of the insertion peg and axially perforates the insertion peg; the mouthpiece vice cover and the mouthpiece main cover are abutted to each other or have an appropriate distance therebetween. 
         [0011]    Wherein the mouthpiece vice cover includes a cylindrical vice cover body formed by combination of a top wall and a side wall and comprising a vice cover cooling cavity, a vent hole is provided on the top wall of the vice cover body and axially perforate to allow for venting between the inside and outside of the vice cover cooling cavity; a locating rim matching the casing is formed on the top end outer wall of the mouthpiece vice cover and radially extends outward. 
         [0012]    Wherein the mouthpiece main cover and the mouthpiece vice cover are both made from plastic material with good heat insulation effect. 
         [0013]    Wherein a liquid isolating member is provided in the casing, the liquid-storage member is accommodated and fixed in the closed space defined by the mouthpiece cover, a part of the casing and the liquid isolating member, a duct for supporting the liquid-storage member is provided on the inner wall of the liquid-storage member and the duct is communicating with the mouthpiece cover and the liquid isolating member respectively, the atomizer is supported and fixed to the duct. 
         [0014]    Wherein the atomizer includes an electric heat wire and a liquid guiding member supporting the electric heat wire, the electric heat wire is working under the control of a control board provided in the casing and winds around the liquid guiding member; the positive and negative electrodes of the electric heat wire perforate the liquid isolating member to connect to the corresponding electrodes on the control board. 
         [0015]    Wherein the duct is a hollow round tube with a center through hole, a fixing groove for supporting and fixing the liquid guiding member is provided in the duct and runs through the tube wall, the liquid guiding member lies across the inside of the duct and both ends of the same separately run through the fixing groove and abut to the liquid-storage member to absorb the tobacco-liquid for atomizing by the electric heat wire. 
         [0016]    Wherein the liquid-storage member has a hollow-cylinder structure, and is sleeved on the outside of the duct and tensionally engaged with the outer wall of the duct for supporting, both ends of the liquid-storage member are separately abutted with the mouthpiece cover and the liquid isolating member, and the inner side wall of the liquid-storage member is abutted with the liquid guiding member. 
         [0017]    Wherein the liquid isolating member is shaped as a cylinder and includes a main body formed by combination of a side wall and a bottom wall, the middle of the liquid isolating member is provided with an insertion peg for inserting with the duct, the middle of the insertion peg is provided with a vent hole axially running through the main body, an annular inner cavity for accommodating the duct and the liquid-storage member is formed between the insertion peg and the inner side wall of the liquid isolating member, a tensioner ring for matching the casing is formed on the outer side wall of the liquid isolating member and radially extends outward; the main body is fixed to the inner wall of the casing by the tensional engagement of the outer side wall thereof and the tensioner ring; the bottom of the annular inner cavity is provided with a wire guiding hole locating at the outside of the insertion peg and axially perforating the bottom wall of the liquid isolating member. 
         [0018]    By adopting the above embodiments, the present invention has the following advantages: first, the formation of a cooling cavity between the mouthpiece main cover and the mouthpiece vice cover of the mouthpiece component allows for the fine tobacco-liquid particles contained in the smoke naturally cooling and condensing on the inner wall of the cooling cavity, which can reduce or avoid inhaling of the tobacco-liquid by smokers. Secondly, while smoke flowing through the mouthpiece component, the heat exchanged between the smoke and the mouthpiece component is absorbed by the mouthpiece main cover and the mouthpiece vice cover as a share, such that the temperatures of the mouthpiece main cover and the mouthpiece vice cover are relatively low, which can avoid burning or scalding the mouth of the smoker and improve the utilization safety of the electronic cigarette. In addition, a closed space for storing the tobacco-liquid is formed by the mouthpiece cover, the liquid isolating member and a part of the casing together, replacing the conventional tobacco-liquid cup. The liquid-storage member is accommodated within the closed space and the inner structure is simple, which makes the assembly and disassembly of the electronic cigarette convenient and quick. 
         [0019]    Embodiments of the present invention taken in conjunction with the accompanying drawings are described in details as following. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]      FIG. 1  is a front view of an electronic cigarette according to a first embodiment of the invention. 
           [0021]      FIG. 2  is a cross-sectional view of the electronic cigarette according to the first embodiment of the invention. 
           [0022]      FIG. 3  is an exploded view of the electronic cigarette according to the first embodiment of the invention. 
           [0023]      FIG. 4  is a cross-sectional view of the mouthpiece main cover of the electronic cigarette according to the first embodiment of the invention. 
           [0024]      FIG. 5  is a cross-sectional view of the mouthpiece vice cover of the electronic cigarette according to the first embodiment of the invention. 
           [0025]      FIG. 6  is a cross-sectional view of the liquid isolating member of the electronic cigarette according to the first embodiment of the invention. 
           [0026]      FIG. 7  is a front view of an electronic cigarette according to a second embodiment of the invention. 
           [0027]      FIG. 8  is a cross-sectional view of the electronic cigarette according to the second embodiment of the invention. 
           [0028]      FIG. 9  is a perspective view of the mouthpiece vice cover of the electronic cigarette according to the second embodiment of the invention. 
           [0029]      FIG. 10  is a cross-sectional view of the mouthpiece vice cover of the electronic cigarette according to the second embodiment of the invention. 
           [0030]      FIG. 11  is a front view of an electronic cigarette according to a third embodiment of the invention. 
           [0031]      FIG. 12  is a cross-sectional view of the electronic cigarette according to the third embodiment of the invention. 
           [0032]      FIG. 13  is a cross-sectional view of the mouthpiece main cover of the electronic cigarette according to the third embodiment of the invention. 
           [0033]      FIG. 14  is a cross-sectional view of the mouthpiece vice cover of the electronic cigarette according to the third embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0034]    It should be noted that, in case no interference is resulted in, the embodiments and features contained herein may be combined with each other. The present invention is described in greater detail in conjunction with the accompanying drawings and embodiments. For purposes of description, direction shown in  FIG. 1  will be referred in this embodiment. 
         [0035]    As shown in  FIGS. 1 to 6 , a first embodiment of the present invention provides an electronic cigarette  100 , which is an integrated electronic cigarette including a casing  1 , the casing  1  is an integrated casing and shaped as a hollow cylinder. One end of the casing  1  is provided with a mouthpiece component  4  for sucking by smoker, and the other end of the casing  1  is closed by a base cover  19  on which an intake hole and an indicator light (not marked in the FIG.) are provided. Material of the casing  1  employs any one of following materials with the required hardness: metals, plastics, wood or paper materials. 
         [0036]    The electronic cigarette  100  also includes an atomizer  21  for transferring the tobacco-liquid into smoke by atomizing, a duct  35  for smoke flowing therethrough, a liquid-storage member  37  for storing tobacco-liquid, a liquid isolating member  31  for preventing tobacco-liquid from leaking, a storage power source  36  as well as a separate member  38  disposed between the liquid isolating member  31  and the storage power source  36  provided in the casing  1 . 
         [0037]    The mouthpiece component  4  includes a mouthpiece main cover  41  and a mouthpiece vice cover  42  used in combination with the mouthpiece main cover  41 , a cooling cavity for cooling the fine tobacco-liquid particles contained in the smoke on the inner wall thereof and allowing for the heat being absorbed by the mouthpiece main cover  41  and the mouthpiece vice cover  42  as a share while the smoke flowing through the mouthpiece component  4  is formed between the mouthpiece main cover  41  and the mouthpiece vice cover  42 . The mouthpiece main cover  41  is inserted into the casing  1  and fixed to the inner wall of the casing by tensionally engaging of the outer side wall thereof. The mouthpiece main cover  41  includes a cylindrical main cover body  410  formed by combination of a bottom wall and a side wall and comprising a main cover cooling cavity  413 , an insertion peg  411  is formed on the bottom wall of the mouthpiece main cover  41  and axially extends outward, a vent hole  412  is provided in the middle of the insertion peg  411 , axially perforating the mouthpiece main cover  41  and communicating with the center through hole of the duct  35 , a locating rim  414  matching the casing  1  is formed on the top end outer wall of the mouthpiece main cover  41  and radially extends outward. The mouthpiece vice cover  42  is inserted into the main cover cooling cavity  413  of the mouthpiece main cover  41  and tensionally fixed to the side wall of the main cover cooling cavity  413 . The mouthpiece vice cover  42  includes a cylindrical vice cover body  420  formed by combination of a top wall and a side wall and comprising a vice cover cooling cavity  422 , a vent hole  421  is provided on the top wall of the vice cover body  420  and axially perforates to allow for venting between the inside and outside of the vice cover cooling cavity  422 . 
         [0038]    Since the vice cover cooling cavity  422  of the mouthpiece vice cover  42  is communicating with the main cover cooling cavity  413  of the mouthpiece main cover  41 , the smoke enters into the main cover cooling cavity  413  from the vent hole  412  in the mouthpiece main cover  41 , and then enters into the mouth of a smoker from the vent hole  421  of the mouthpiece vice cover  42  through the vice cover cooling cavity  422  of the mouthpiece vice cover  42 . In this process, a part of fine tobacco-liquid particles contained in the smoke are cooled and condensed into tobacco-liquid drops on the side wall of the vent hole  412  of the mouthpiece main cover  41  and flow back to the duct  35 , the other part of fine tobacco-liquid particles contained in the smoke continue to be cooled and condensed into tobacco-liquid drops on the top wall and side wall of the vice cover cooling cavity  422 , the tobacco-liquid drops remain in the mouthpiece vice cover  422  or flow back to the duct  35  through the side wall of the vent hole  412  of the mouthpiece main cover  41 . The amount of the fine tobacco-liquid particles contained in the smoke are reduced significantly after cooling and condensing twice in the mouthpiece cover component  4 , thus the possibility of tobacco-liquid particles being inhaled in smoker mouth is greatly reduced or avoided. Meanwhile, the smoke will transfer heat with the mouthpiece component  4  when flowing through the mouthpiece component  4 , and the heat exchanged may be absorbed by the mouthpiece main cover  41  and the mouthpiece vice cover  42  and also be distributed and shared by both. Therefore, the mouthpiece main cover  41  and the mouthpiece vice cover  42  each has a relatively low increased temperature when exchanging heat with the smoke respectively, which can prevent the smoker from burning or scalding at time of sucking the mouthpiece component  4 , and thus improve the utilization safety. In order to further improve the utilization safety of the mouthpiece cover component  4 , the mouthpiece main cover  41  and the mouthpiece vice cover  42  are both made from plastic materials with better heat insulation effect. 
         [0039]    Inside the casing of the electronic cigarette  100  is provided with an atomization device (not marked in the FIG.) for transferring the tobacco-liquid into smoke by atomizing. The atomizer  21  is a part of the atomization device. The atomization device also includes a control board  22  for controlling the operation of the atomizer  21  and a control board support  23 . The control board  22  is placed in the control board support  23 , and a micro-pneumatic switch is provided on the control board  22  to control the circuit to energize in order to make the electric heat wire start to work. The atomizer  21  includes an electric heat wire  211  and a liquid guiding member  212  for absorbing the tobacco-liquid and supporting the electric heat wire  211 , the electric heat wire  211  winds around the liquid guiding member  212 . The liquid guiding member  212  can absorb and store the tobacco-liquid, and can be made from glass fiber or materials with liquid absorbent and liquid storage properties, such as cotton materials. In the present example, the liquid guiding member  212  is accommodated and fixed in the duct  35  which will be described hereafter, and both ends of the electric heat wire  211  respectively run through the liquid isolating member  31  and are electrically connecting with the positive electrode and the negative electrode of the control board  22 . 
         [0040]    The liquid isolating member  31  is inserted into the casing  1  and is fixed to the inner wall of the casing  1  by the tensional engagement of the outer side wall thereof, the liquid isolating member  31  is shaped as a cylinder and includes a main body  310  formed by combination of a side wall (not marked in the FIG.) and a bottom wall (not marked in the FIG.), the middle of the liquid isolating member  31  is provided with an insertion peg  311  for inserting with the duct  35 , the middle of the insertion peg  311  is provided with a vent hole  312  axially running through the main body  310 , an annular inner cavity  313  for accommodating the duct  35  and the liquid-storage member  37  is formed between the insertion peg  311  and the inner side wall of the liquid isolating member  31 , a tensioner ring  314  for matching the casing  1  is formed on the outer side wall of the liquid isolating member  31  and radially extends outward. The main body  310  is fixed to the inner wall of the casing  1  by the tensional engagement of the outer side wall thereof and the tensioner ring  314 ; the bottom of the annular inner cavity  313  is provided with a wire guiding hole  315  locating at the outside of the insertion peg  312  and axially perforating the bottom wall of the liquid isolating member  31 . 
         [0041]    In this example, the liquid isolating member  31 , the mouthpiece main cover  41  and a part of the casing  1  together form a closed space similar to the conventional tobacco-liquid cup for storing the tobacco-liquid. The liquid isolating member  31  and the mouthpiece main cover  41  are fixed to the inner wall of the casing  1  oppositely and spaced with a certain distance. The liquid isolating member  31  is used for preventing the tobacco-liquid in the liquid-storage member  37  from leaking out of the closed space. In the closed space is proved with a liquid-storage member  37  for storing the tobacco-liquid and a duct  35  for supporting the liquid-storage member, the liquid-storage member  37  is sleeved on the outside of the duct  35  and located between the liquid isolating member  31  and the mouthpiece main cover  41 , both ends of the liquid-storage member  37  are separately abutted with the liquid isolating member  31  and the mouthpiece main cover  41  so as to be fixed axially. 
         [0042]    The duct  35  is used to support the liquid-storage member  37  meanwhile used to support the liquid guiding member  212 , and also used as a channel guiding the smoke produced after the tobacco-liquid being atomized by the atomizer  2 . In this example, the duct  35  is a hollow cylindrical tube with a center through hole and can be made from plastic or fiber materials such as glass fiber tube, including a top portion and a bottom portion, wherein the top portion is inserted with the insertion peg  411  of the mouthpiece main cover  41 , and the bottom portion is abutted with the liquid isolating member  31  and sleeved on the insertion peg  311  of the liquid isolating member  31 , that is, the insertion peg  311  of the liquid isolating member  31  is inserted and fixed into the duct  35 . The center through hole of the duct  35  respectively is communicated with the vent hole  412  of the mouthpiece main cover  41  and the vent hole  313  of the liquid isolating member  31  respectively. A fixing groove  351  for supporting and fixing the liquid guiding member  212  is provided in the duct  35  and runs through the tube wall, the liquid guiding member  212  lies across the inside of the duct  35  and both ends thereof separately run through the fixing groove  351  and abut to the liquid-storage member  37  to absorb the tobacco-liquid for atomizing by the electric heat wire  211 . 
         [0043]    The liquid-storage member  37  is used for absorbing and storing the tobacco-liquid in order for the atomizer  2  atomizing the tobacco-liquid subsequently, and can be made from materials with liquid absorbent and liquid storage properties, such as cotton material. The liquid-storage member  37  has a hollow cylinder structure, and is sleeved on the outer side of the duct  35  and tensionally engaged with the outer wall of the duct  35  to support. The inner side wall of the liquid-storage member  37  is also abutted with the liquid guiding member  212 . The tobacco-liquid penetrates from the liquid-storage member  37  to the inside of the liquid guiding member  212 , and is evaporated to smoke by the electric heat wire  211  after being absorbed. 
         [0044]    During smoking, external air enters from the intake hole on the bottom of the casing  1 , through the vent hole  313  of the liquid isolating member  31 , the center through hole of the duct  35 , the vent hole  412  of the mouthpiece main cover  41 , the vent hole  421  of the mouthpiece vice cover  42  flows out of the casing  1 , forming an air path inside the electronic cigarette, and the electronic cigarette communicating with external air smoothly. Of course, external air can also enters directly from the vent hole  421  of the mouthpiece vice cover  42  through the vent hole  412  of the mouthpiece main cover  41  into the casing  1  and reach inside of the duct  35 . When tobacco-liquid in the liquid-storage member  37  runs out, the tobacco-liquid can be reloaded by pulling out the mouthpiece cover component  4 . 
         [0045]    As shown in  FIGS. 7 to 10 , a second embodiment of the present invention provides an electronic cigarette  100 , which has a substantially same internal structure with that of the electronic cigarette  100 ′, except for including a mouthpiece cover component  4 ′ similar to the mouthpiece cover component  4 , wherein the mouthpiece cover component  4 ′ includes the mouthpiece main cover  41  and a mouthpiece vice cover  42 ′ used in combination with the mouthpiece main cover  41 , and the mouthpiece vice cover  42 ′ is inserted into the main cover cooling cavity  413  of the mouthpiece main cover  41  and tensionally fixed to the side wall of the main cover cooling cavity  413 . The mouthpiece vice cover  42 ′ includes a vice cover body  420 ′ formed by combination of a top wall and a side wall and comprising a vice cover cooling cavity  422 ′, a vent hole  421 ′ is provided on the top wall of the vice cover body  420 ′ and axially perforates to allow for venting between the inside and outside of the vice cover cooling cavity  422 ′; the bottom of the vice cover body  420 ′ extends outward to form an insertion peg  423 ′ for inserting with the main cover cooling cavity  413  of the mouthpiece main cover  41 , the inside of the insertion peg  423 ′ is provide with a through hole  424 ′ communicating with the vice cover cooling cavity  422 ′. 
         [0046]    The principle of the mouthpiece cover component  4 ′ is the same with that of the mouthpiece cover component  4 , and will not be described in details herein. The mouthpiece cover component  4 ′ and the mouthpiece cover component  4  play the same role and have the same effect. 
         [0047]    As shown in  FIGS. 11 to 14 , a third embodiment of the present invention provides an electronic cigarette  100 , which has a substantially same internal structure with that of the electronic cigarette  100 , except for including a mouthpiece cover component  4 ″ similar to the mouthpiece cover component  4 , wherein the mouthpiece cover component  4 ″ also includes a mouthpiece main cover  41 ″ and a mouthpiece vice cover  42 ″ used in combination with the mouthpiece main cover  41 ″, the mouthpiece main cover  41 ″ is inserted into the casing  1  and fixed to the inner wall of the casing  1  by the tensional engagement of the outer side wall thereof. The mouthpiece main cover  41 ″ includes a main cover body  410 ″ tensionally engaging with the inner side wall of the casing  1 , the bottom of the main cover body  410 ″ axially extends outward to form an insertion peg  411 ″ for inserting with the duct  35  in order to define one end of the duct  35 , a vent hole  412 ″ is provided in the middle of the insertion peg  411 ″ and axially perforates the insertion peg  411 ″ and communicates with the center through hole of the duct  35 . The mouthpiece vice cover  42 ″ is inserted in the casing  1  and tensionally fixed to the inner side wall of the casing  1 , meanwhile abutted to the mouthpiece main cover  41 ″ or has an appropriate distance. The mouthpiece vice cover  42 ″ includes a cylindrical vice cover body  420 ″ formed by combination of a top wall and a side wall and comprising a vice cover cooling cavity  422 ″, a vent hole  421 ″ is provided on the top wall of the vice cover body  420 ″ and axially perforates to allow for venting between the inside and outside of the vice cover cooling cavity  422 ″; a locating rim  423 ″ matching with the casing  1  is formed on the top end outer wall of the mouthpiece vice cover  42 ″ and radially extending outward. At this time, the space between the mouthpiece main cover  41 ″ and the mouthpiece vice cover  42 ″ which is inside part of the casing  1  can also be deemed as a part of the vice cover cooling cavity  422 ″. 
         [0048]    Since the vice cover cooling cavity  422 ″ of the mouthpiece vice cover  42 ″ is communicating with the main cover cooling cavity  412 ″ of the mouthpiece main cover  41 ″, the smoke enters into the vice cover cooling cavity  422 ″ from the vent hole  412 ″ in the mouthpiece main cover  41 ″, and then enters into the mouth of a smoker from the vent hole  421 ″ of the mouthpiece vice cover  42 ″. In this process, the principle of the mouthpiece cover component  4 ″ is the same with that of the mouthpiece cover component  4 , and will not be described in details herein. The mouthpiece cover component  4 ″ and the mouthpiece cover component  4  play the same role and have the same effect. 
         [0049]    The above description discloses the specific embodiments of the present invention. Note that those skilled in the art will appreciate multiple modifications and variations in light of the features of the present invention, and those modifications and variations shall be deemed within the scope of this invention.