Abstract:
In an electronic cigarette of the sort having a housing, a power section, and an atomizer, at least a portion of a first flow stream passes through the atomizer. A mixing valve within the housing has a first input that receives the first flow stream, and a second input receiving a second flow stream ( 20 ) that avoids the atomizing element, and an output ( 34 ) connected in fluid continuity to the opening in the proximal end, wherein the output conducts a mixture of the first flow stream ( 25 ) and the second flow stream ( 20 ). The apparatus further includes a regulating element ( 42 ) for the mixing valve in order to control a composition of the mixture.

Description:
PRIORITY 
       [0001]    This application claims priority to PCT Application No. PCT/IB2012055287 (Int&#39;l Pub. No. WO2013/050934), filed on Oct. 3, 2012, entitled “SMOKING SYSTEM,” which claims priority to U.S. Provisional No. 61/543,841, filed on Oct. 6, 2011, each of which are herein incorporated by reference. 
     
    
     FIELD OF INVENTION 
       [0002]    This disclosure relates to tobacco product alternatives. More particularly, this disclosure relates to a smoking device for limiting exposure to smoke fumes produced through combustion, for example tobacco combustion. 
       BACKGROUND 
       [0003]    Tobacco-containing smoking devices are known. For example from U.S. Pat. No. 7,726,320, which is herein incorporated by reference, and which proposes a cigarette incorporated within an electrically powered aerosol generating device that acts as a holder for that cigarette. The smoking article possesses at least one form of tobacco. The smoking article also possesses a mouth-end piece that is used by the smoker to inhale components of tobacco that are generated by the action of heat upon components of the cigarette. A representative smoking article possesses an outer housing incorporating a source of electrical power (e.g., a battery), a sensing mechanism for powering the device at least during periods of draw, and a heating device (e.g., at least one electrical resistance heating element) for forming a thermally generated aerosol that incorporates components of tobacco. During use, the cigarette is positioned within the device, and after use, the used cigarette is removed from the device and replaced with another cigarette. 
         [0004]    European patent document EP 1 736065, herein incorporated by reference, proposes an electronic cigarette containing nicotine without tar, which includes a shell and a suction nozzle. On the exterior wall of the shell, there is an air orifice, while there is an electronic circuit board, a constant pressure cavity, a sensor, a gas liquid separator, an atomizer, and a supplying bottle orderly located in the interior of the shell, wherein the electronic circuit board consists of an electronic switching circuit and a high-frequency generator. At one side of the sensor there is an air duct. A negative pressure cavity is located in the sensor. The atomizer connects with the supplying bottle, and there is an atomizing cavity located in the atomizer. 
       SUMMARY 
       [0005]    There is provided according to embodiments of the invention a smoking apparatus, sometimes referred to as an electronic cigarette or e-cigarette. A distal opening of the apparatus admits a first flow stream, and a proximal end has an opening to allow egress of fluid flow therethrough into a mouth of a smoker. The apparatus further includes a power section in a housing, an atomizer section accepting an aerosol-forming material and an atomizing element. The atomizing element is energized by a power element in the power section, wherein at least a portion of the first flow stream passes through the atomizer section and acquires an aerosol from the atomizing element therein. A mixing valve within the housing has a first input that receives the first flow stream, a second input receiving a second flow stream that avoids the atomizing element, and an output connected in fluid continuity to the opening in the proximal end, wherein the output conducts a mixture of the first flow stream and the second flow stream. The apparatus further includes a regulating element for the mixing valve in order to control a composition of the mixture. 
         [0006]    According to one aspect of the smoking apparatus, the distal opening is adapted to receive a cigarette therein and the first flow stream carries a flow of smoke of the cigarette. The housing has an external vent formed therethrough, and the second input of the mixing valve is connected to the vent. The second flow stream includes ambient air drawn through the vent. 
         [0007]    In an aspect of the smoking apparatus the first flow stream comprises ambient air drawn through the distal opening and the body of the housing has an external vent formed therethrough. The smoking apparatus includes a mounting adapter for docking a portion of a cigarette alongside the housing, so that a proximal end of the cigarette is in fluid communication with the vent, and the second flow stream includes cigarette smoke of the docked cigarette that is drawn through the vent. 
         [0008]    According to yet another aspect of the smoking apparatus, the mixing valve is disposed upstream from the atomizing element, and the mixture of the first flow stream and the second flow stream passes through the atomizer section. 
         [0009]    According to still another aspect of the smoking apparatus, the mixing valve is disposed downstream from the atomizing element and only one of the first flow stream and the second flow stream passes through the atomizer. 
         [0010]    According to a further aspect of the smoking apparatus, the power element includes a super-capacitor. The mixing valve may be a ball valve, a shutter valve, a diaphragm valve or a hinge valve. 
         [0011]    There is further provided according to embodiments of the invention a smoking apparatus, having a housing, a proximal end and a distal opening that admits a first flow stream, the proximal end having an opening to allow egress of fluid flow therethrough into a mouth of a smoker. The apparatus further includes a power section in the housing, an atomizer section accepting an aerosol-forming material and an atomizing element. The atomizing element is energized by a power element in the power section, wherein at least a portion of the first flow stream passes through the atomizer section and acquires an aerosol from the atomizing element therein, and wherein a second flow stream divides from the first flow stream upstream from the atomizing element and bypasses the atomizing element. The apparatus further includes a mixing valve within the housing that is disposed downstream from the atomizing element, and which has a first input that receives the first flow stream, a second input that receives the second flow stream, an output connected in fluid continuity to the opening in the proximal end, wherein the output conducts a mixture of the first flow stream and the second flow stream, and a regulating element for the mixing valve to control a composition of the mixture. 
         [0012]    According to one aspect of the smoking apparatus, the distal opening is adapted to receive a cigarette therein and the first flow stream carries a flow of smoke of the cigarette. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The system and method may be better understood with reference to the following drawings and description. Non-limiting and non-exhaustive embodiments are described with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. In the drawings, like referenced numerals designate corresponding parts throughout the different views. 
           [0014]      FIG. 1  is a semi-schematic diagram of a smoking device in accordance with an embodiment of the invention; 
           [0015]      FIG. 2  is a semi-schematic diagram of a smoking device in accordance with an alternate embodiment of the invention; 
           [0016]      FIG. 3  is a semi-schematic diagram of a smoking device showing a power supply element in accordance with an alternate embodiment of the invention; 
           [0017]      FIG. 4  is a semi-schematic diagram of a smoking device in accordance with an alternate embodiment of the invention; 
           [0018]      FIG. 5  is a semi-schematic diagram of a smoking device in accordance with an alternate embodiment of the invention; 
           [0019]      FIG. 6  is a semi-schematic diagram of a smoking device in accordance with an alternate embodiment of the invention; 
           [0020]      FIG. 7  is a schematic diagram of illustrating operation of a simplified ball valve that facilitates understanding of the embodiment shown in  FIG. 6 ; 
           [0021]      FIG. 8  is a semi-schematic diagram of a smoking device in accordance with an alternate embodiment of the invention; 
           [0022]      FIG. 9  is a schematic diagram of a valve in accordance with an embodiment of the invention; and 
           [0023]      FIG. 10  is a schematic diagram of a diaphragm valve, in accordance with an embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0024]    In the following description, numerous specific details are set forth in order to provide a thorough understanding of the various principles of the present invention. It will be apparent to one skilled in the art, however, that not all these details are necessarily always needed for practicing the present invention. In this instance, well-known circuits, control logic, and the details of computer program instructions for conventional algorithms and processes have not been shown in detail in order not to obscure the general concepts unnecessarily. Other systems, methods, features and advantages will be, or will become, apparent to one with skill in the art upon examination of the following figures and detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the following claims. Nothing in this section should be taken as a limitation on those claims. Further aspects and advantages are discussed below. 
         [0025]    Subject matter will now be described more fully hereinafter with reference to the accompanying drawings, which form a part hereof, and which show, by way of illustration, specific example embodiments. Subject matter may, however, be embodied in a variety of different forms and, therefore, covered or claimed subject matter is intended to be construed as not being limited to any example embodiments set forth herein; example embodiments are provided merely to be illustrative. Likewise, a reasonably broad scope for claimed or covered subject matter is intended. Among other things, for example, subject matter may be embodied as methods, devices, components, or systems. Accordingly, embodiments may, for example, take the form of hardware, software, firmware or any combination thereof (other than software per se). The following detailed description is, therefore, not intended to be taken in a limiting sense. 
         [0026]    Throughout the specification and claims, terms may have nuanced meanings suggested or implied in context beyond an explicitly stated meaning. Likewise, the phrase “in one embodiment” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment” as used herein does not necessarily refer to a different embodiment. It is intended, for example, that claimed subject matter include combinations of example embodiments in whole or in part. 
         [0027]    In general, terminology may be understood at least in part from usage in context. For example, terms, such as “and”, “or”, or “and/or,” as used herein may include a variety of meanings that may depend at least in part upon the context in which such terms are used. Typically, “or” if used to associate a list, such as A, B or C, is intended to mean A, B, and C, here used in the inclusive sense, as well as A, B or C, here used in the exclusive sense. In addition, the term “one or more” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a,” “an,” or “the,” again, may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. In addition, the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context. 
         [0028]    Turning now to the drawings, reference is initially made to  FIG. 1 , which is a semi-schematic diagram of a smoking device  10  in accordance with an embodiment of the invention. Device  10  has a battery section  12 . The battery section  12  may include power controls. Suitable power controls are disclosed in U.S. Provisional Application No. 61/441,133 (now U.S. Pat. Pub. No. 2013-0319440 A1), which is herein incorporated by reference. The device  10  includes a section  14 , containing an atomizer and an aerosolizable liquid or gel, sometimes referred to herein as an “e-liquid”, which typically contains a mixture of propylene glycol, vegetable glycerin, flavorings. and optionally contains nicotine. The atomizer is essentially a heating element, powered by a battery in the battery section  12 . When powered, the atomizer acts on the liquid or gel. The components of the section  14  may be provided as separate components, or may be integral, as taught in U.S. Provisional Application No. 61/474,569 (now U.S. Pat. Pub. No. 2014-0034071), which is herein incorporated by reference. In the latter case, the section  14  is known as a “cartomizer.” 
         [0029]    An adapter  16  for receiving a tobacco-containing unit  18  is disposed at one end of the device  10  in a longitudinal fashion, so that the device  10 , when docked with the unit  18 , may appear to observers as an actual cigarette. The unit  18  may be a cigarette, a nicotine pack or cartridge, a hookah, or other source of tobacco fumes. In any case, a first air intake for receiving tobacco fumes is represented by arrow  20 . When smoke enters the device  10 , an aperture  22  constricts the flow, thereby creating a pressure differential, which is sensed by an airflow sensor  24  of known type. It is desirable to minimize the flow resistance, for example by minimizing flow constriction, in order that that the user experiences a feeling of smoking an actual cigarette. There is a tradeoff, however, in that the energy transmitted by pressure differences resulting from the inhalation is used to create the atomizer action. For a given pressure difference and flow conditions the ability to release droplets is also dependent on the viscosity of e-liquid. E-cigarettes use a high viscosity liquid that is converted to a low viscosity by heating. 
         [0030]    Electronic circuitry  26  linked to the sensor  24  activates a heating device that enable viscosity reduction and thus activation of the atomizer in the section  14 . Part of this electronic circuitry is a pressure or flow sensor, which switches a power source when the smoker starts inhaling. The circuitry  26  is powered, typically by an electrical power source (single use or rechargeable), for example, a lithium ion battery  28 , other known type of rechargeable battery, or alternatively by a super capacitor. Additionally or alternatively, the aperture  22  may be manually controlled by the user by pressing a button (not shown), which can be mounted on the shaft of the device  10 . For convenience, the device  10  may be configured similarly to a pistol, the actuating button corresponding to the trigger. 
         [0031]    A second air intake is formed through the device  10  as a side vent  30 . The vent  30  may be created in several ways, for example as a longitudinal notch, a hole bored through the shaft of the device  10 , or formed in an adapter connecting the section  14  and the battery section  12  as taught in the above noted U.S. Provisional Application No. 61/474,569. 
         [0032]    A regulated three-way mixing valve  32  accepts air inflow via the first air intake (arrow  20 ) and from the second air intake (vent  30 ). Air exiting the valve  32  represented by arrow  34  contains a mixture of the two inflows in any desired proportion. The inflows may be controlled at constriction points  45 ,  47 . As a result the user inhales, through oral adaptor  36  (arrow  38 ) an air mixture containing from 0-100 percent tobacco fumes. 
         [0033]    The valve  32  may be programmed by electronic circuitry  40  within the device  10 . For example, initial puffs may contain 100% tobacco fumes. Thereafter the valve adjusts automatically to limit the proportion of smoke. Alternatively, a control  42  may be provided for the user to manually adjust the valve  32 . 
         [0034]    The circuitry  40  or the circuitry  26  may disable the atomizer in the section  14  when the proportion of tobacco fumes exceeds a predefined threshold. 
         [0035]    The valve  32 , vent  30 , air flow sensor  24 , and other components need not be positioned as shown. For example they may be relocated upstream in the first air flow, and be placed before the battery  28 . Other locations are possible, but in any case the user inhales a desired proportion of air and tobacco fumes. In some embodiments, a conventional cigarette may be smoked in combination with or in alternation with the e-cigarette. In such cases the air stream resulting from the conventional cigarette should be diverted to bypass the atomizer, as explained below. 
       Alternate Embodiment 1 
       [0036]    Reference is now made to  FIG. 2 , which is a semi-schematic diagram of a smoking device  64  in accordance with an alternate embodiment of the invention. The general construction of the smoking device  64  is similar to the device  10  ( FIG. 1 ). However the valve  32  is disposed downstream (in the direction of inhaled airflow) from the atomizer in the section  14 . 
       Alternate Embodiment 2 
       [0037]    The battery  28 , particularly when realized as a lithium ion battery, has several disadvantages. Charging and discharging must be carefully regulated. In addition, precautions must be taken to prevent contact with liquid in the section  14 , should leakage occur. Indeed, under some circumstances the battery  28  could be a fire hazard. In addition, charging times limit the utility of the device  10 , or may require the user to carry duplicates of the battery section  12  or the battery  28 . 
         [0038]    Reference is now made to  FIG. 3 , which is a schematic diagram of a smoking device  46  in accordance with an alternate embodiment of the invention. In this embodiment, the battery  28  is replaced by a super capacitor  44 , which can be charged within seconds by connection to ordinary house power. The device  46  is provided with intakes  58 ,  60  for air and tobacco fumes. The capacitance of the capacitor  44  is sufficient to power the atomizer for a desired number of usages before it discharges. 
       Alternate Embodiment 3 
       [0039]    Reference is now made to  FIG. 4 , which is a schematic diagram of a smoking device  48  in accordance with an alternate embodiment of the invention. In this embodiment, the device  48  has a mounting adapter  49  for docking a portion of a conventional cigarette  50  or other source of tobacco fumes longitudinally alongside the housing. The smoke enters through a side vent as described above (arrow  52 ). Ambient air enters through a distal end intake (arrow  54 ), both reaching mixing valve  56 . It will be noted that an air stream represented by arrow  54  passes through an atomizer  57 , while the air stream from the cigarette  50  does not enter the atomizer  57 . 
       Alternate Embodiment 4 
       [0040]    In this embodiment the air intake is regulated by valves at the intakes, or alternatively, by a mixing valve located at the intake, which can be an electronically controlled valve, or any other type of valve as explained elsewhere herein. Reference is now made to  FIG. 5 , which is a semi-schematic diagram of a smoking device  66  in accordance with an alternate embodiment of the invention. In this embodiment, the aperture  22  ( FIG. 1 ) has been replaced by a shutter valve  68 . The vent  30  is guarded by another shutter valve  70 . The shutter valves  68 ,  70  have the same construction, as best seen in balloons  72 ,  74 . Alternatively, the two shutter valves may differ in construction. In any case, the combined flows exit toward the oral adaptor  36  via outlet tube  76  as shown by the arrow  34 . 
         [0041]    In the shutter valves  68 ,  70 , an air shutter  62  is slidable over intake  58  to restrict air flow therethrough. The shutter  62  may be controlled manually by the user, or automatically by a controller  78  to adjust the relative flows through inlet tubes  80 ,  82 . The shutters shown in  FIG. 5  are exemplary. Other closure arrangements, e.g., hinged valves, electronically controlled valves, cam driven piston valves, can be substituted for the shutter valves  68 ,  70 . Several such alternatives are described in the embodiments below. Indeed the shutter valves  68 ,  70  can be used as regulatory elements in the valve  32  ( FIG. 1 ). 
       Alternate Embodiment 5 
       [0042]    Reference is now made to  FIG. 6 , which is a semi-schematic diagram of a smoking device  84 , in accordance with an alternate embodiment of the invention. In this embodiment the valve  32  ( FIG. 1 ) is realized as a ball valve  64 , in which air outflow may be allocated in any desired proportion between an outlet  86  leading to a vent  88  and an outlet  90  leading toward the oral adaptor  36 . Ball valves typically have low maintenance costs. In addition to affording quick, quarter-turn on-off operation, ball valves are compact, require no lubrication, and give tight sealing with low torque. However, they have relatively poor throttling characteristics. In a throttling position, the partially exposed seat is vulnerable to erosion because of the impingement of high velocity flow. 
         [0043]    A first air stream, represented by arrows  20 , is diverted from the atomizer by shutter valve  23 , and reaches the ball valve  64 . A second air stream, represented by arrows  25  enters via aperture  21 , passes through the atomizer  57  and thence to the ball valve  64 . Thus mixing occurs in the ball valve  64  downstream from the atomizer  57 , after it has acted on the second air stream. 
         [0044]    Reference is now made to  FIG. 7 . which is a schematic diagram of illustrating operation of a simplified ball valve  92  that facilitates understanding of the ball valve  64  ( FIG. 6 ), in accordance with an embodiment of the invention. Fluid flow direction is indicated by the arrows in  FIG. 7 . From left to right, the ball valve  92  is shown in open, throttled, and closed positions, respectively. 
         [0045]    The ball valve  92  has a body  94  and a ball  96 , an inlet  98  and a single outlet  100 . In this respect the ball valve  92  is unlike the ball valve  64 , which has two outlets  86 ,  90 . The ball  96  rotates about an axis  102 , under control of an actuator  104 . 
       Alternate Embodiment 6 
       [0046]    Reference is now made to  FIG. 8 , which is a semi-schematic diagram of a smoking device, in accordance with an alternate embodiment of the invention. In this embodiment, mixing occurs after a portion of the airflow has passed through the atomizer. A bypass tube  106  transmits a proportion of the air flow, the proportion being regulated by the control  42  at a constriction point  108 , while the remainder of the airflow passes through the atomizer via tube  110 , as shown by arrow  112 . When the constriction point  108  is fully open, the atomizer offers greater flow resistance than the bypass tube  106 , and most of the flow passes through the bypass tube  106 . Actuating the control  42  constrains flow through the bypass tube  106  at the constriction point  108 , so that a greater proportion of the flow arrives at the vent  30  by passing through the atomizer and the tube  110 . Providing a parallel flow circuit via the bypass tube  106  allows the total flow resistance to be lowered. The arrangement shown schematically in  FIG. 8  may be applied, mutatis mutandis, to any of the other embodiments disclosed herein. 
       Alternate Embodiment 7 
       [0047]    Reference is now made to  FIG. 9 , which is a schematic diagram of a valve  114  in accordance with an embodiment of the invention. The valve  114  can be employed in the various embodiments herein, for example at the constriction points  108 ,  45  ( FIG. 8 ). Movement of a ball (or cylinder)  116  against the wall of a tube  118  produces compression and increases flow resistance. 
       Alternate Embodiment 8 
       [0048]    Reference is now made to  FIG. 10 , which is a schematic diagram of a diaphragm valve  120 , in accordance with an embodiment of the invention, wherein displacement a diaphragm  122  by an actuator  124  into the flow throttles or obstructs the flow entirely. From left to right the diaphragm valve  120  is shown in open, throttled, and closed positions, respectively. The diaphragm valve  120  can be used in the various embodiments herein, for example at the constriction points  108 ,  45  ( FIG. 8 ). 
         [0049]    It will be appreciated by persons skilled in the art that the present invention is not limited to what has been particularly shown and described hereinabove. Rather, the scope of the present invention includes both combinations and sub-combinations of the various features described hereinabove, as well as variations and modifications thereof that are not in the prior art. which would occur to persons skilled in the art upon reading the foregoing description. The illustrations of the embodiments described herein are intended to provide a general understanding of the structure of the various embodiments. The illustrations are not intended to serve as a complete description of all of the elements and features of apparatus and systems that utilize the structures or methods described herein. Many other embodiments may be apparent to those of skill in the art upon reviewing the disclosure. Other embodiments may be utilized and derived from the disclosure, such that structural and logical substitutions and changes may be made without departing from the scope of the disclosure. Additionally, the illustrations are merely representational and may not be drawn to scale. Certain proportions within the illustrations may be exaggerated, while other proportions may be minimized. Accordingly, the disclosure and the figures are to be regarded as illustrative rather than restrictive.