Water pipe

Abstract

A water pipe is disclosed as having a heating chamber for vaporising a consumable product in use. A coolant reservoir in the form of a water tank is provided for cooling the vapourised consumable product. An inlet allows air into the heating chamber and an outlet is provided through which a user can inhale the vaporised smoking product. The outlet is downstream of the coolant reservoir in a flow pathway through the water pipe from the inlet through the heating chamber and coolant reservoir to the outlet. The air pathway has a second air inlet to provide air into the air pathway at a point between the inlet and the outlet and an adjustment mechanism for the second air inlet. The second air inlet may be at a hose or mouthpiece connected to the outlet. The second air inlet could be in a purge valve assembly or at a mouth of the coolant reservoir. A vapour conduit extends from the heating chamber to the water reservoir. A non-return valve in the form of a float valve may be provided to prevent backflow of water up the conduit. A thermal insulator or break may be configured to thermally isolate at least a portion of vapour conduit from the heating chamber.

Description

[0001] Water Pipe

[0002] The present disclosure relates to a water pipe, particularly, but not limited to, an electronically controlled and / or electrically heated hookah-type device.

[0003] Background of the invention

[0004] A prior art hookah device is shown in WO 2015 / 172224. The device comprises a electronically heated chamber at an upper end thereof configured to receive a capsule comprising a smoking product. The user of the device inhales through a hose and draws air into the capsule. The air entrains a smoking product, which passes through a conduit into water tank provided at the lower end of the device. The smoking products passes through water into the tank, and through the hose to the user. The device thus acts as similarly to a conventional shisha pipe, however, heating is the smoking product is electronically controlled.

[0005] The inventor has found numerous problems with prior art devices. The smoking product contained within the capsule typically comprises a viscous product, such a shisha product. This increases the resistance to the flow of air passing through system. This, in turn, increases the draw resistance for the user. Low airflow and / or an increased draw resistance may provide undesirable experience for the user.

[0006] Furthermore, capsules for such products have been developed to be prepacked retail articles holding a predetermined portion of a consumable product. Accordingly, the capsules do not behave in a manner akin to manually-prepared smoking material, which is handled specifically before smoking to ensure a suitable density of the smoking product is achieved. In contrast, prepacked capsules aim to achieve a consistent experience for the end user over a predetermined duration of consumption at a carefully controlled temperature.

[0007] The electronic heater is provided on the side of heating chamber to provided increase vertical airflow through the heating chamber. However, this emits heat toward the internal portions of the device. This reduces heat available for heating the smoking product and may cause undesired high temperatures within the device. Electrically-heated hookahs are particularly well suited to heating applications where it is not intended to burn the consumable product, but instead heat it to a controlled elevated temperature for emitting vapour to a user. As such devices of this kind can be used to deliver a variety of less harmful or therapeutic substances to the user than conventional hookahs.

[0008] Despite the practical differences between electrically heated hookahs and combustion / charcoal-based hookahs, it has been found that end users of such devices will typically wish to use a hookah in a conventional manner, i.e. wishing to control the strength of the inhaled vapour according to the rate at which they draw air though the device.

[0009] In view of the above, there are practical challenges in designing an electrically-heated, capsule-based hookah so that it offers a pleasant or familiar experience to the user.

[0010] The present invention aims to overcome or ameliorate one or more of the above problem.

[0011] Statement of Invention

[0012] According to a first aspect, there is provided: a water pipe comprising: a heating chamber arranged to receive a consumable product; an inlet in to provide air into the heating chamber and an outlet in which a user can inhale the vaporised product, an air pathway defined between the inlet and the outlet; and a second air inlet to provide air into the air pathway at a point between the inlet and the outlet.

[0013] The heating chamber may be for heating and / or vaporising the consumable product in use. The device may comprise a closure. The closure may selectively close the heating chamber. The inlet may be provided on the closure. The closure may seal the heating chamber when closed, save for the inlet.

[0014] The second air inlet may comprise an adjustment mechanism to provide adjustment of the resistance to flow therethrough, e.g. to adjust an effective cross-sectional or open flow area of the inlet. The second air inlet may comprise an adjustment mechanism to provide adjustment of the air flow rate therethrough. The adjustment mechanism may comprise one or more aperture (i.e. the second air inlet), which may or may not be provided in a channel / conduit of the air pathway. A movable member may be selectively movable to vary the effective cross-sectional area of the one or more aperture. The movable member may be movable to selectively overlie or occlude the one or more aperture.

[0015] The movable member comprises rotatable sleeve or linearly movable slider. The sleeve / slider may at least partially surround the channel and / or be mounted thereon. The sleeve may be annular / ring shaped.

[0016] The movable member may comprise a valve (i.e. a variably opening valve).

[0017] The movable member may be manually actuatable, i.e. by the user, and may be accessible on an exterior surface of the water pipe or a hose attached thereto.

[0018] One of the movable member and the channel may comprise an elongate aperture, a profiled aperture or a plurality of apertures. The selective exposure of the one or more apertures, e.g. by the movable member, may allow control of the available flow area of the second air inlet. The one or more aperture may be selectively alignable with an aperture in the other of the movable member and the channel. The plurality of differently sized apertures may be provided on the movable member.

[0019] The movable member may be movable to a position where the one or more aperture is completely obscured / occluded. The movable member may be is biased or lockable into one or more position. The movable member and the channel may comprise an indent / detent arrangement. The movable member may comprise a valve (e.g. a valve stem) or shutter.

[0020] The water pipe may comprise a hose and / or a mouthpiece. The second air inlet may be provided at a point in the air pathway passing through the hose and / or mouthpiece. The second air inlet may be adjacent the air outlet and / or located towards the outlet / mouthpiece relative to the length of the hose.

[0021] The mouthpiece may comprise a handle / grip portion. The second air inlet may be provided on the handle / grip portion. The water pipe may comprise a cooling fluid container. The container may be removable attached to the water pipe. The container may have an outlet. The second air inlet air may be provided at a point between the inlet and the outlet of the fluid container. The fluid container may comprise a closure. The second inlet may be provided on, through or in the vicinity of the closure.

[0022] The water pipe may comprise a purge valve, e.g. on the fluid container or in a portion of the device housing in communication with the interior of the fluid container. The purge valve may allow unidirectional purging of air within the fluid container. The second inlet may be provided on, or adjacent, the purge valve. The second inlet may be provided on a valve seat of the purge valve or as part of a valve assembly or module of the purge valve.

[0023] The purge valve may be provided on the closure / lid of the container, e.g. on an underside / base of a housing covering the container. The purge valve may be provided as plug or the like in the closure.

[0024] The second inlet may comprise an unobscured channel.

[0025] The heating chamber is typically provided in a housing of the water pipe.

[0026] A compartment may be provided between the heating chamber and the fluid container, e.g. an internal compartment of the housing. The second inlet may provide fluid communication between the compartment and the fluid container. The compartment may comprise an inlet to provide fluid communication with the compartment and the ambient environment. The inlet may comprise a grating, mesh or grille. The compartment may form a neck portion and / or electronics compartment of the housing. The conduit may extend through the compartment.

[0027] A conduit may be provided between the heating chamber and fluid container. The conduit may comprise a tube or pipe. Air from the second inlet may be directed to provide cooling of one or more internal component. Air from the second inlet may directed over the conduit to provide cooling thereof. Air from the second inlet may directed into the conduit. Air from the second inlet may directed into an electronics compartment and / or onto one or more battery.

[0028] The conduit may comprise a constriction, neck or narrow portion therein. The constriction may induce turbulence / acceleration of air travelling through the air pathway. The conduit may comprise a first portion. The conduit may comprise a second portion, e.g. arranged in flow series with the first portion. The first conduit portion may comprise a greater cross-sectional airflow area than the second portion.

[0029] The water pipe may comprise a compartment (e.g. the electronics compartment) adjacent the fluid container, which may be provided in a device housing. The first conduit portion may be provided in / through the compartment. The second conduit portion may be provided in the liquid container, e.g. extending outside of the compartment / housing.

[0030] A wider conduit portion or widening in the air pathway may be provided. The widening may be adjacent / proximal the constriction. A tapered or stepped transition may be provided between the widening and the constriction or vice versa.

[0031] The device may comprise a second constriction. The second constriction may comprise a narrower cross-sectional airflow area than the first constriction. A stepped transition may be provided between the first and second constriction. A tapered or stepped transition may be provided between any adjacent widening / constriction.

[0032] The fluid container comprises a closure. A portion of the closure may be interposed between the first and second conduit portions or located at the interface between the first and second conduit portions. The portion of the closure may be received within a cavity.

[0033] The first and / or second conduit portions may comprise an interlocking arrangement to provide a releasable connection to the closure.

[0034] The conduit, e.g. the first and / or second conduit portions, may comprise a seal configured to abut against the closure or the adjacent conduit portion. The seal may be resiliently deformable.

[0035] The water pipe may comprise a thermal insulator. The thermal insulator may be configured to thermally isolate at least a portion of conduit from the heating chamber. The thermal insulator may be provided in / adjacent a head portion of the water pipe. The thermal insulator may be provided in a neck portion and / or electronics compartment of the water pipe. The thermal insulator may be configured to operatively connect the heating chamber and the conduit. The thermal insulator may comprise a sleeve, ring or plug configured to receive or be received in the conduit and / heating chamber. The heating chamber and the conduit may be physically spaced. The thermal insulator may comprise a stop member or flange (e.g. to ensure the heating chamber and conduit are spaced).

[0036] The thermal insulator may operatively connect portions of the conduit. The thermal insulator may be provided part way along the conduit. The thermal insulator may space portions of the conduit.

[0037] The thermal insulator may be arranged to provide a thermal break to reduce heat transfer from the heating chamber to the conduit by conduction.

[0038] The heating chamber may be provided in a first compartment and the conduit may be provided in a second compartment of the water pipe or a housing thereof. The thermal insulator may be configured to thermally separate the first and second compartment. The first compartment may comprise the head portion. The second compartment may comprise the neck portion and / or electronics compartment.

[0039] The insulator may comprise a plate or disc. The insulator may be configured to surround or enclose the conduit and / or heating chamber. The insulator may comprise a recess or aperture. The conduit / heating chamber may be received in the recess / aperture. The insulator may be configured to surround or enclose the air pathway.

[0040] The thermal insulator may be configured to at least partially surround the conduit and / or heating chamber. The thermal insulator may comprise a sleeve and / or coating on the conduit. The thermal insulator may extend along at least 25% of the axial length of the conduit; preferably, at least 50%; preferably, at least 75%; preferably, at least 85%; preferably, at least 90%. The thermal insulator may extend along the first portion of the conduit. The second portion may of the conduit may not comprise a thermal insulator.

[0041] The insulator may comprise a bowl or tray. The insulator may conform to the shape of the heating chamber and / or conduit. The insulator may conform to the shape of an outer casing. The insulator may extend across the width of the device or a casing thereof. The insulator may thermally separate one or more internal area / compartment of the device water pipe. The insulator may thermally isolate a heater (e.g. a heating element). The insulator may thermally isolate the heating chamber. The insulator may be interposed between the conduit and one or more power supply or battery. The insulator may comprise a ceramic. The insulator may comprise a thermally insulating material. The insulator may comprise a mineral wool.

[0042] The conduit may comprise a diffuser arrangement towards its free end, i.e. the end of the conduit that is immersed in the cooling fluid in use. The conduit may comprise a change in internal diameter towards its free end. The conduit may comprise a plurality of flow openings towards its free end.

[0043] The conduit may comprise one or more flow opening defining a flow area greater than the bore of the conduit towards its free end.

[0044] The one or more flow opening may be provided in the side wall of the conduit, e.g. defining a lateral flow opening. This may be additional / alternative to a longitudinal flow opening in the end of the conduit.

[0045] The conduit may be shaped to receive a valve member, e.g. a float valve member. The valve member may comprise a ball or float held in the cooling fluid in the container in use. The conduit may be shaped to define a valve seat for the valve member. The valve seat may comprise a step or intermediate wall between a narrow internal diameter and a wider internal diameter of the conduit. The conduit may comprise a retaining information for retaining the valve member in the conduit. The retaining formation may limit the freedom of movement, i.e. constrain, the valve member.

[0046] The valve member may be provided in the vicinity of the diffuser and / or flow openings, e.g. towards the free end of the conduit.

[0047] According to a further aspect, there is provided: a hookah device comprising: a heating chamber for heating and vaporising the smoking product in use; a conduit extending between the heating chamber and a cooling fluid container to provide an air pathway therebetween; and a thermal insulator configured to thermally isolate at least a portion of conduit from the heating chamber.

[0048] According to a further aspect, there is provided, a hookah device comprising: a heating chamber for heating and vaporising the smoking product in use; a conduit extending between the heating chamber and a cooling fluid container to provide an air pathway therebetween; the conduit comprising a constriction and / or expansion therein to induce turbulence to air travelling within the air pathway.

[0049] The conduit may define the flow passage therein and the profile / width of the flow passage may vary at one or more location along the length of the conduit.

[0050] The wall thickness of the conduit may vary along its length. The wall thickness of the conduit within the container may be greater than the wall thickness of the conduit passing through a housing / compartment of the water pipe.

[0051] According to a further aspect, there is provided, a hookah device comprising: a heating chamber for heating and vaporising the smoking product in use; a conduit extending between the heating chamber and a cooling fluid container to provide an air pathway therebetween; the device further comprising an outlet by which a user can draw air through the device in use, wherein the conduit comprises a float member restrained by the conduit within the portion of the conduit that is immersed in the cooling fluid in use and the conduit comprises a seat formation for cooperation with the float member such that biasing of the float member against the seat formation blocks the conduit against reverse flow of the cooling fluid towards the heating chamber.

[0052] The outlet is downstream of the cooling fluid container in the direction of flow along the air pathway. Negative pressure applied at the outlet in use may displace the valve member from the seat formation.

[0053] Any optional or preferable features described in relation to any one aspect of the invention may be applied to any further aspect, wherever practicable.

[0054] Detailed Description

[0055] Practicable embodiments of the disclosure are described below in further detail, by way of example only, with reference to the accompanying drawings, of which:

[0056] Figure 1 shows a perspective view of a hookah device;

[0057] Figure 2 shows a side view of the hookah device;

[0058] Figure 3 shows a sectional side view of the hookah device; Figure 4 shows a perspective view of a conduit of the hookah device;

[0059] Figure 5 shows a sectional view a transition portion on the conduit;

[0060] Figure 6 shows a perspective view of a mouthpiece of the hookah device;

[0061] Figure 7 shows a perspective cross-sectional view of the mouthpiece;

[0062] Figure 8 shows a perspective view of a tank lid assembly of the hookah device;

[0063] Figure 9 shows a sectional view of the tank lid assembly;

[0064] Figure 10 shows a perspective view of a purge valve assembly;

[0065] Figure 11 shows a sectional side view of a first air cooling system;

[0066] Figure 12 shows a sectional side view of a second air cooling system;

[0067] Figure 13 shows a sectional side view of a third air cooling system;

[0068] Figure 14 shows a sectional side view of a head portion of the hookah device;

[0069] Figure 15 shows a perspective view of an insulation assembly;

[0070] Figure 16 shows a sectional side view of the insulation assembly;

[0071] Figure 17 shows a sectional side view of a second embodiment of the insulation assembly;

[0072] Figures 18A and 18B each show a sectional view through an example of a valve arrangement in the conduit.

[0073] A water pipe device 2 is shown in figures 1 and 2. In general, the device 2 is configured to heat a consumable smoking or vapour-producing product to allow inhalation thereof by a user. The consumable product may comprise any suitable form as described in the art. The consumable product may comprise a tobacco-based product, for example, shisha. However a wide variety of consumable products are possible, including alternatives to tobacco and / or therapeutic products for delivery of vapour to the user.

[0074] The consumable product is provided in a capsule. The capsule is configured to be heated by the device 2. The device 2 may be portable or handheld or may be a larger, tabletop device.

[0075] The device comprises a head portion 4. The head portion 4 is configured to contain the smoking product capsule in use. The device 2 typically receives the capsule on or within the head portion 4. The head portion 4 is provided at the upper end of the device in use. The head portion 4 comprises a disc or lenticular / convex shape, e.g. being wider than a neck portion of the device. The device 2 comprises a base portion 6. The base portion provides a reservoir, container or tank for a cooling liquid 8 (e.g. water). The base portion 6 is generally bulbous or rounded. The base portion 6 comprises a flat lower surface 10 to ensure the device 2 stays upright. The lower surface 10 may comprise grip members (e.g. rubber pads). The base portion 6 comprises a transparent material. This allows the user to ensure the water level is correct. The base 6 may comprise glass. The base 6 may comprise a transparent polymer, for example, one or more of: acrylic (PMMA); butyrate; polycarbonate; PET; or PETG.

[0076] A neck portion 12 defines a housing / compartment region that connects the base 6 and the head 4 portions. The neck portion 12 tapers toward the head portion 4. The base portion 6 and neck portion 12 may comprise a pear or tear shape. The head portion 4 is wider than the neck 12 at the interface therebetween. The head portion 4 thus extends outwardly from the neck portion. The head portion 4 thus provides a flange or rim. The neck portion 12 provides a handle for the user. The head portion 4 and the neck portion 12 may be opaque. The neck portion 4 may comprise a grip or the like and could comprise a high- friction material (e.g. rubber etc) if desired.

[0077] The neck portion 12 contains an electronics compartment 12A (shown in figure 3), which will be described in detail later.

[0078] The head portion 4 and neck 12 are detachable / separable from the base portion 6. The electronics compartment is therefore separable from the base 6. This allows access to the reservoir to add / remove cooling liquid therefrom. The neck portion 12 may be removably attached to the base 6 by a threaded connection, a bayonet connection, or similar connection means.

[0079] The device 2 is generally circular in cross-section (i.e. in a top-down direction). However, it can be appreciated, the device may comprise any suitable cross-sectional shape, e.g. polygonal, elliptical or complex shape. The cross-sectional shape may vary along the axial length of the device 2. The device 2 comprises a thermally and / or electrically insulating material on its exterior, i.e. defining a housing for the internal components / structures. Typically the device 2 housing comprises a polymeric material.

[0080] A hose 14 is connected to the device 2. The hose 14 is removably attached. This allows the hose 14 to be cleaned and / or detached for storage. The hose 14 is received with an aperture or socket 16 (shown in figure 2) in the neck portion 12. The hose 14 is therefore fluidly connected to the interior of the base 6, i.e. to the air space in the interior of the water tank.

[0081] The hose 14 is mounted via an interference or friction fit. A hose connector 18 and / or the aperture / socket 16 may comprise a high-friction material (e.g. rubber). One or more seal may be provided at the interface between the hose end connector 18 and the aperture / socket 16.

[0082] The connector 18 is tapered toward an end thereof. In other embodiments, the hose may be mounted to the device 2 via one or more of: a fastener; a latch; a screw thread; an indent / detent arrangement; a clamp or other suitable means. A releasable hose is provided in the embodiment shown but a permanently mounted hose could be used if desired.

[0083] In some embodiments, the hose 14 may be connected to the device 2 via a snap-fit or click fit. Typically, a resiliently biased detent is provided on either the device 2 or the connector 18. The detent is configured to snap-fit into a corresponding recess / groove on the connector 18 or the device 2 accordingly. The detent may be biased via a spring or the like. In some embodiments, the detent may comprise an arcuate or annular ring. The detent is received within a correspondingly shape arcuate / annular recess.

[0084] The hose 14 is flexible. The hose 14 may comprise a flexible polymer. The hose 14 comprises a mouthpiece 20. The mouthpiece 20 may be removable / detachable from the hose 14. The mouthpiece 20 may comprise a removable cover / mouth or the like (e.g. to improve hygiene between multiple users).

[0085] The head 4 comprises a lid 22 to provide an opening thereto. This allows insertion of the capsule containing the consumable product. The lid 22 is pivotably / hingedly attached to the device 2. The lid 22 is provided at the upper end of the device 2. The smoking product is therefore loaded into the upper end of the device in this example. The lid 22 comprises a round / circular shape.

[0086] As shown in figure 3, a heater 24 is mounted within the device 2. The heater 24 is mounted within the electronics compartment 12 and / or head portion 4. The heater 24 is configured to receive the capsule. The heater 24 heats the capsule to vaporise or otherwise disperse one or more ingredient of consumable product in use.

[0087] The walls 26 of the heater 24 are shaped to conform to the shape of the capsule. The capsule thus forms a close fit with the heater in use. The walls 26 comprise a concave shape. Typically, the walls 26 are trapezoidal or frustoconical.

[0088] The heater 24 encloses or surrounds the capsule in use. The heater 24 thus forms a heating chamber or cavity. The lid 22 closes the heating chamber 24. The cavity / chamber is thus sealed / enclosed in use in the form of an oven. One or more heating element may be provided on, within and / or integral with the walls 26 of the heating chamber 24. The heating chamber 24 comprises a thermally conductive material (e.g. metal). Thus, heat passes through the walls 26 of the heating chamber 24 into the capsule in use.

[0089] In other embodiments, the heating means are displaced from the heating chamber. For example, the heating means may surround or enclose the heating chamber. The heating means may project or direct a beam or airflow into the heating chamber.

[0090] Typically, the heating means comprise a resistive element (i.e. heated by electrical current flowing therethrough). The resistive element may be formed directly on or be integral with the walls 26 of the heating chamber. However, any suitable means may be used to heat the heating chamber 24 and / or capsule, for example, one or more of: inductive heating; microwave heating; infrared heating; convective heating (e.g. the heating element is displaced away from the heating chamber wall 26); electronically controlled combustion heating (e.g. using gas or other fuel).

[0091] As best seen in figure 1 , the lid 22 comprises an air inlet 28 therein. The heating chamber 24 therefore comprises one or more air inlet 28 to allow air into the heating chamber 24. This air then mixes with the vaporised product in the heating chamber 24. The air inlet 28 allows to pass through the lid 22 (i.e. the inlet 28 provides a channel through the lid 22). The air inlet 28 is provided in a central portion of the lid 22. The air inlet 28 is thus provided over the heating chamber 24 / capsule in use. The air inlet 28 may comprise a plurality of apertures or perforations. The air inlet 28 may comprise a grille or mesh to prevent debris entering the inlet 28. The heater 24 may be controlled by electronics in the electronics compartment 12 (e.g. via a heater controller). The electronics may comprise a microcontroller / microprocessor; memory (volatile and / or non-volatile); and / or electrical regulation circuitry (e.g. power limiter and / or controller). The electronics compartment 12 comprises any suitable components to provide heating of the heater 24.

[0092] The device 2 may comprise a communication interface. The communication interface may be wired and / or wireless. The wire interface may comprise a USB or Ethernet interface (e.g. USB port). The wireless interface may comprise an interface for communication via one or more of: Wifi; Bluetooth; NFC; Infrared; cellular (e.g. GSM, 3G, 4G, 5G etc.). The device 2 may comprise any suitable antenna for wireless communication.

[0093] The device comprises power supply. The power supply may provide electrical power to the heater 24 and / or the heater controller. The power supply may be mains powered (e.g. via wire or the like). Additionally or alternatively, the power supply comprises an on-board energy store such as one or more battery 35 as shown in figure 3. The battery may be removable and / or rechargeable. Power transmission to the device 2 may be wired or wireless. The battery 35 may be rechargeable.

[0094] A power switch 30 is provided on the front / side of the device. The device 2 and / or the heater 24 may therefore be manually controlled (e.g. activated / deactivated). The switch may comprise a push switch or touch interface.

[0095] The device 2 comprise an indicator 32. The indicator comprises a light (e.g. an LED). The indicator 32 may indicate a power level to the heater 24 and / or the temperature thereof. The indicator 32 comprise a series of lights. Thus, the number of lights illuminated may be indicative of the power level / temperature of the heater 24. In some embodiments, the indicator 32 may comprise a display or the like. The display may be interactive (e.g. a touchscreen).

[0096] The heating chamber 24 is operatively / fluidly connected to the water / cooling tank 6 via a conduit 34. The conduit 34 provides a pipe, tube or channel from the heating chamber interior to a coolant / water contained in the tank. The conduit 34 is generally sealed to / against the heating chamber 24 to prevent air leakage therefrom. The conduit 34 extends into the tank 6 to a depth proximal the base of the tank. The conduit 34 therefore extends into the cooling fluid within the tank in use. The conduit may comprise a one-way valve to prevent back flow into the heating chamber 24.

[0097] The conduit 34 passes through the electronics compartment 12A in the neck 12. The conduit 34 therefore seals or segregates the heating chamber 24 and / or vapourised product from electronic compartment 12A to prevent contamination thereof. The electronics compartment comprises a cavity or hollow to accommodate the conduit 34. The cavity is fluidly isolated from the heating chamber 24 and / or the water container 6.

[0098] A battery 35 of plurality of batteries surround or enclose the conduit 34. This provides a compact configuration. The conduit 34 therefore passes through a battery arrangement or compartment. Typically, the batteries comprise a cylindrical cell like arrangement. The cells are arranged about the circumference of the conduit 34. Between four and eight cells may be used. In some embodiments, the batteries 35 are spaced from the conduit 34 to reduce thermal transfer therebetween. For example, the batteries 35 may be mounted to the casing / housing of the neck portion 12 or supported in a chassis or the like within the compartment 12A interior.

[0099] The conduit 34 comprises a diffuser 36. The diffuser 36 is typically provided at an end 38 of the conduit 34. The diffuser may comprise a plurality of apertures, which in this example take the form of slots or cut-outs in the side wall of the conduit 34 The end 38 of the conduit 34 may be closed / sealed (i.e. such that all air pass through the diffuser). Alternatively, the end 38 of the conduit 34 may be open, in which case gas / vapour may exit the conduit through the end opening and the apertures in the side wall thereof. The end 38 may be narrowed or otherwise constricted in some examples.

[0100] In use, air passes into the air inlet 28 and into the heating chamber 24. The air then entrains vaporised smoking product in the heating chamber 24. The air then passes into the conduit 34 and through the water / coolant in the tank 8. The air and / or vapour is cooled and / or filtered in the coolant. The air then bubbles up through the coolant and into the hose 20. Typically, air flow is provided by a negative pressure from the user (i.e. applied at the mouthpiece 20).

[0101] Where a capsule is used, porous walls are provided on capsule to allow air to enter the capsule and / or to allow the vaporised product to escape therefrom. Porosity may be provided by apertures or perforations on one or more sides of the capsule. The apertures are typically less than 5mm in diameter.

[0102] The conduit 34 is shown in isolation in figures 4 and 5. The conduit 34 comprises a first portion 34A. The first portion 34A is contained within the neck portion 12, i.e. passing through compartment 12A. The conduit 34 comprises a second portion 34B. The second portion 34B extends into the tank 6 and / or the cooling liquid when present. The second portion 34B therefore protrudes / depends from the housing of the neck portion and / or compartment 12A to its distal end 38.

[0103] The portions 34A,B are fluidly connected via a connector assembly or mounting 40. The connector assembly 40 provides an airtight connection therebetween.

[0104] A support structure 42 is configured to engage and support the conduit 34 and is described herein as a chassis since it provides common support for a number of components and / or sub-assemblies. The chassis 42 is configured to support the conduit 34 and / or electronics, batteries 35 etc within the neck portion 12 (see figures 8 and 9). This prevents any undesired lateral and / or vertical movement of the conduit 34 relative to other internal components or the housing.

[0105] Referring back to figure 5, the chassis 42 comprises an aperture to receive the first conduit 34A. The aperture comprises a collar or sleeve 44 configured to surround the conduit 34A. The sleeve 44 forms a tight fit with the conduit 34A. The sleeve 44 comprises a gasket, screw thread 46 or other releasable sealing means. A flange 48 or rim is provided at the end of the sleeve 44. The flange 48 limits movement of the conduit 34A (i.e. provides a stop member).

[0106] The chassis 42 and the first conduit 34A are received within a cavity 50, i.e. end opening, in the second conduit 34B. The chassis 42 is thus interposed between the first and second conduits 34A,B. This helps to secure both conduit portions.

[0107] The second conduit 34B comprise a rim of flange 52. The flange 52 comprises a gasket or seal 54 configured to abut / seal against the chassis 42. The gasket / seal 54 is annular. Typically, the sleeve 44 is fully received within the cavity 50 such that the second conduit 34B abuts the chassis 42. The cavity 50 in the second conduit 34B decreases in cross-sectional area with distance away from the first conduit 34B. The cavity 50 thus comprises tapering internal side wall 56. The cavity 50 comprises a conical or funnel shape. The taperin g / conical shape provides a constriction or narrowing. The cavity 50 comprise a greater cross-section area or width than the first conduit 34A at the interface therebetween. The cavity 50 thus provides a widening.

[0108] A second cavity 58 is provided adjacent the tapering sides wall 56. The second cavity 58 comprise a reduced cross-sectional area relative to the first cavity 50 and the first conduit 34A. A third cavity 60 is provided adjacent the second cavity 58. The third cavity 60 comprises a reduced cross-sectional area relative to the second cavity 58 and the first conduit 34A. The second conduit 34B thus comprise a reduced effective cross-sectional area (i.e. inner diameter) than the first conduit 34A in the region beyond the first cavity 50.

[0109] In the present embodiment, the transition between the second cavity 58 and the third cavity 60 is discontinuous. This provides a step 62 or like between the cavities 58,60. The increased width cavity 50; tapering walls 56 and / or the step 62 induce turbulent, vortical or otherwise nonlinear flow (see arrows in figure 5). The reduction in diameter of the conduit also accelerates the flow along the second conduit 34B relative to the first conduit 34A.

[0110] In the present embodiment, the widening / constriction arrangement is provided at an end of second conduit 34B. This allows easy machining of the tapering / step structure. In some embodiments, the widening / constriction may be provided part way along the second conduit 34B (i.e. toward the end 38 of the conduit 34). In some embodiments, widening / constriction arrangement is provided on the first conduit 34A. The arrangement may be provided at an end or part way along the first conduit 34A. In some embodiments, the transition between the cavities 50,58,60 comprises a respective step arrangement. In some embodiments, the transition between the cavities 50,58,60 comprises a tapering arrangement. In some embodiment, a single transition may be provided (e.g. a single tapering or step). In some embodiments, a plurality of cavities may be provided, with a respective step / tapering transition provided therebetween.

[0111] In the current example, the second conduit 34B has increased wall thickness compared to the first conduit 34A. The second conduit 34B thus has a greater mass of material making up the conduit at low temperature, i.e. cooled by the water in the tank 6. The acceleration and triggering of turbulence in the gas / vapour flow through the second conduit portion relative to the first conduit, as well as the diffuser arrangement as the gas / vapour enters the water has been found to provide both a good draw resistance for the user and concentration of vapor derived from the constricted flow rate through the heating chamber.

[0112] The mouthpiece 20 shown in closer detail in figures 6 and 7. The mouthpiece 20 comprises mouth portion 64 configured to be receive on / within the user’s mouth. The mouth portion 64 may be shaped to accommodate the user’s lip(s). The mouthpiece 20 comprises a handle portion 66. The mouthpiece 20 is generally elongate (e.g. comprises a cylindrical shape) and extends upstream of the mouthpiece 64, e.g. adjacent the air inlet 68 such that the user can operate the air inlet whilst gripping the handle.

[0113] The mouthpiece comprises an air inlet 68 to allow air from the ambient environment to enter the mouthpiece. The ambient air then mixes with the gas / vapour passing through the mouthpiece from the hookah pipe 2. This helps to increase airflow to the user and / or may provide cooling to the airflow.

[0114] The effective cross-section of the air inlet 68 is variable to allow variation of the airflow into the mouthpiece from the inlet 68. This allows the user to selectively vary the total airflow through the mouthpiece. The air inlet 68 is provided in a collar / sleeve 70. The collar 70 is rotatable relative to the mouthpiece 20.

[0115] The collar 70 is movable such that an inlet 68 is aligned with an aperture 72. The aperture 72 is formed with a conduit or channel 74 enclosing an internal cavity 76 in the mouthpiece. The e 70 thus movable such that an inlet 68 is fluidly connected to the cavity 76 provided within the mouthpiece.

[0116] A plurality of inlets 68A,B,C are provided. Each of inlets 68A,B,C comprise different cross- sectional areas (e.g. diameters). Thus, the by rotating the collar 70, the user can align the desired inlet 68A,B,C over the internal aperture 72. Given the different cross-sectional areas of the inlets 68A,B,C, the effective inlet flowrate can be varied by the user, i.e. the rate at which ambient air is entrained into the flow to the mouthpiece when a user draws. Although three inlets 68A,B,C are provided in the present embodiment, it can be appreciated that as many inlets 68 can be provided as required, thus allowing finer / coarser adjustment of the inlet flowrate as required. The collar 70 may be rotatable such that none of the inlets 68 are aligned with the aperture 72 (i.e. to a “closed” position). The internal inlet 72 has a greater cross-sectional area than the inlets 68A,B,C, ensuring that the inlets 68A,B,C are limiting factor in the flowrate. The inner channel 74 and the collar 70 may be spaced by a spacer 78. The spacer 78 provides a sleeve or the like surrounding the channel 74. The spacer 78 comprises a cavity / aperture 80 to allow fluid communication between the aperture 72 and the inlet 68. The spacer 78 may comprise a low friction material to aid rotation of the sleeve 70.

[0117] Indicia may be provided to indicate the position of the collar 70. The indicia may indicate the position of the aperture 72 and / or which inlet 68 is aligned therewith. The indicia may indicate a flowrate. The indicated flowrate may be arbitrary (e.g. “high”, “medium”, “low”).

[0118] The collar 70 may be configured to inter-engage with the mouthpiece 20 to lock or bias the sleeve into one or more position. This helps to prevent unintentional rotation of the sleeve. Typically, the position corresponds to when one or more of the inlets 68 is in fluid communication with the cavity 76. For example, an indent / detent arrangement may be provided. The indent / dents are arranged such that collar 70 is biased into respective positions when the inlets 68A,B,C are aligned with the aperture 72 and / or to the closed position. In some embodiments, the collar 70 is mounted via a screw thread. In some embodiments, a lock, latch or ratchet may be movable to selectively engage the sleeve to prevent rotation thereof.

[0119] It can be appreciated that a similar arrangement can be provided by forming a plurality of different sized apertures 72 on the inner conduit 74. The sleeve 70 comprises a single aperture 68 movable into position over the different sized apertures 72.

[0120] In some embodiments, substantially the same function may be provided by a sliding arrangement. For example, a plurality of inlets 68 are provided on linearly movable carriage or slider. The slider is movable to align the desired inlet 68 with the inner aperture 72. The slider may be axially movable along the mouthpiece 20.

[0121] In some embodiments, the size of the inlet 68 or the inner aperture 72 may be elongate and / or continuously variable. For example, the inlet 68 / aperture 72 may comprises a wedge or tapering shape. The sleeve / slider is therefore movable to allow continuous variation of the effective size of the aperture, i.e. to reveal a greater or smaller portion of the aperture to vary its effective flow area. In some embodiments, the inlet 68 cross sectional area may be adjustable via variable size aperture (e.g. a diaphragm or iris). In some embodiments, the inlet 68 may comprise a valve or shutter. The extent of opening of the valve may provide adjustable airflow. The valve may be biased toward the closed position, thus preventing air ingress. The user may selectively open the valve to allow airflow therein. In other embodiments, the valve may comprise a fixed airflow rate upon adjustment thereof.

[0122] In some embodiments, the inlet / valve may not be adjustable, thus allowing a fixed airflow therethrough. For example, a simple aperture or channel may be provided in the mouthpiece. The user may selectively vary the airflow therethrough by obscuring the inlet / valve with their finger, or a slider etc.

[0123] The inlet arrangement may be provided at any suitable position on the mouthpiece 20. In the present embodiment, the inlet 68 is provided on the handle portion 66. The inlet 68 is therefore provide in a central portion of the mouthpiece 20 between the handle and mouth 64. In some embodiments, the inlet 68 may be provided proximal either end of the mouthpiece 20 (i.e. at mouth end 64 or the toward the hose 14 end).

[0124] In some embodiments, multiple inlet arrangements may be provided. The inlets may be spaced along the axial length of the mouthpiece 20. In some embodiments, the inlet arrangement may be provided on the hose 14 and / or the hose connector 18. Thus, the inlet arrangement may be provided at any point on the air pathway between the tank 6 and the mouth 64 of the mouthpiece.

[0125] Referring to figures 8-10, the device 2 comprises a second air inlet arrangement 82. The inlet arrangement 82 is configured to allow ambient air to enter the water tank 6. The ambient air then mixes with the air within the tank 6 from the heating chamber 24. This helps to increase airflow to the user and / or may provide cooling to the airflow.

[0126] The inlet 82 is provided within a lid arrangement 84. The lid 84 is configured to substantially seal the air tank 6. The lid 84 is formed integrally with the neck chassis 40. The lid 84 comprises a skirt 86. The skirt 86 is configured to surround an upstanding flange or lip 88 on the tank 6. The skirt 86 and flange 88 are releasably attached. This allows the user to empty / f ill the tank 6. The skirt 86 and flange 88 are releasably attached via cooperating screw thread. However, it can be appreciated that any suitable mechanism may be used, for example, a bayonet arrangement, interference fit, latches, friction fit etc. The skirt 86 and / or lid 84 is configured to seal against the flange 88 to ensure water-tight connection therebetween.

[0127] A purge valve assembly 90 is provided to allow purging of the air within the tank 6. For example, this may allow the user to remove stale air from the tank 6 in the direction of arrow A. The purge valve 90 comprise a diaphragm or cap 92. The diaphragm 92 is configured to abut against a seat 94. The diaphragm 92 may biased into engagement with the seat 94 (see figure 10) to ensure an effective seal therebetween. The bias may be provided by the resiliency of the valve. The valve seat 94 may form a plug or the like configured to received with the lid 84. In other embodiments, the valve assembly 90 may be integral with the lid 84.

[0128] The valve assembly 90 provide unidirectional airflow. Air can therefore egress the tank via the valve 90, however, ingress is prevented when a user applies a negative pressure to the tank via the mouthpiece. The valve assembly 90 may comprise any suitable arrangement check valve, for example: a ball valve; swing valve; lift valve; duckbill; reed; or stop valve. The user ma purge the tank by applying positive pressure to the mouthpiece, i.e. by blowing instead of drawing.

[0129] In use, when air pressure is increased within the tank 6, the diaphragm 92 is lifted or deforms away from the valve seat 94. The valve 92 therefore moves to an open position and air can egress the tank 6. Air then passes out through an outlet 96 provided in the housing of the neck portion 12. The outlet 96 comprises a grating or mesh to prevent contamination within the housing 12. In some embodiments the outlet 96 comprises a filter or the like.

[0130] One or more secondary air inlet 98 is provided in the purge valve assembly 90. The inlet 98 allows air to ingress the tank 9. In the present embodiment, the air inlet 98 comprises a channel or aperture. The channel 98 is unobscured / open (i.e. no valve or the like is provided). The secondary air inlet 98 is therefore passive. The air inlet 98 is provided in the valve seat 94. A plurality of apertures are provided. The shape, number and / or size of the apertures is generally configured to prevent excessive flow of air therethrough. Instead, the secondary air inlet 98 is provided to reduce the resistance to airflow through the device when drawing at the mouthpiece. This is important because the airtight arrangement between the capsule and the heating chamber that is required for correct / consistent heating of the capsule contents creates a relatively high resistance to draw through the device.

[0131] Also, in the interest of prolonging the duration over which a single capsule is consumed, it is desirable that a relatively low flow rate through the capsule is maintained. As such the constriction in the conduit and the tight seal with the capsule are beneficial features for capsule longevity and consistent smoking but produce an abnormally high resistance to draw, or low flow rate, experienced by the user. The consistent flow through the secondary air inlet 98 and / or user controlled inlet 68 allow for an improved experience by the user.

[0132] The apertures 98 may comprise a diameter less than or equal to 5mm; preferably, less than or equal to 2mm; preferably, less than or equal to 1 ,5mm; preferably, less than or equal 1 ,2mm. The aperture may comprise a diameter of 1 mm. The apertures may comprise a diameter greater than or equal to 0.5mm.

[0133] In the present embodiments, the number of apertures is two. The apertures 98 are provided either side of the diaphragm 92. It can be appreciated the number of apertures can be varied according to the desired airflow. The total effective cross-sectional area of inlet 98 (i.e. the sum total area of all the inlet apertures) may be less than or equal to 15mm2; preferably, less than or equal to 10mm2;preferably, less than or equal to 8mm2. The total effective cross-sectional area of inlet 98 may be greater than or equal to 2mm2; preferably, greater than or equal to 4mm2.

[0134] In use, the user draws air through the mouthpiece, reducing the instantaneous pressure within the tank. As shown in figure 9, this draws air through the conduit 34 and the inlet 98 into the tank 6. Both the conduit air and the inlet air mix in the tank, and then pass into the hose 14

[0135] The inlet 98 may be provided in any suitable location, for example, the lid 84 or skirt 86. In some embodiments, the inlet 98 is provided in the tank 6. For example, proximal an upper edge on the tank 98. The inlet 98 may be provided in the space between the tank 9 and the skirt 86. For example, the inlet 98 may be provided on or adjacent the flange 88. In some embodiments, the inlet 98 could comprise a unidirectional or check valve. In some embodiments, airflow through the inlet 98 may be adjustable. An adjustment mechanism may be provided as described in relation to inlet 68. For example, one or more inlets may be provided on the tank 6 and / or lid arrangement 84. A collar or sleeve may overlie the inlet 98. The collar / sleeve may be rotatable to vary the effective cross- sectional area of the inlet 98. Alternatively, a slider may be movable to obscure and / or vary the effective cross-sectional area of the inlet 98.

[0136] In some embodiments, the air flowing to the inlet 98 may be used to provide cooling for the device 2. Air may enter via the device via a second inlet 100. The air may then be direct around one or more components of the device 2 to provide cooling thereof.

[0137] As shown in figure 11 , the cooling air 102 may be directed over or onto the conduit 34. The device may comprise a second inlet 100 fluidly connected to the conduit in which air is drawn into. The primary inlet 98 is provided in lid 90 the tank 6, as previously described. The second inlet 100 may be provided on the neck portion 12 or adjacent the head portion 4. The cooling air 102 may therefore along the length of the conduit 34. The cooling air 102 may help to cool the batteries 35, to prevent over-heating thereof. The cooling air 102 may be directed through or over the batteries 35. The neck / electronics compartment 12 may comprise a substantially open structure (i.e. provides a cavity). The cooling air 102 is therefore free to move within the compartment 12, thereby cooling any components therein.

[0138] In some embodiments, a plurality of second inlets 100 may be provided. The inlets 100 may be circumferentially spaced about the neck 12. This provides even cooling throughout the electronics compartment.

[0139] In some embodiments, a secondary inlet 100 may be provided on the lid 22 and / or head portion 4. This may allow cooling of any electronics etc in the head portion 4. A plurality of inlets 100 may be provided accordingly. The inlet 100 may be provided on the upper side of the head 4. The inlets 100 may be fluidly separated from the heating chamber inlet 28.

[0140] The primary inlet 98 may be provided on the conduit 34. The inlet 98 may be provided at any suitable position on the conduit 34. For example, the position of the inlet 98 may be optimised to ensure sufficient cooling of the conduit 34. Typically, the primary inlet 98 is provided toward the tank end of the conduit 34. The inlet 98 is provided within the neck portion 12 (i.e. above the lid 90 in use). In some embodiments, the primary inlet 98 is provided on the lid 98 as previously described.

[0141] Referring to figure 12, the secondary inlet 100 may be provided by the heating chamber air inlet 28. The air inlet 28 may comprise a manifold or diverter to direct a portion of the incoming air to the heating chamber 24 and the remaining portion 102 to provide cooling. The manifold thus provides a “bypass” airflow 102 which bypasses the heating chamber 24.

[0142] The cooling air may be directed over the outer surface 104 of the heating chamber 24 and / or other electronic components. The cooling air may be directed between the insulation surrounding the heating chamber 24 and the heating chamber 24 itself.

[0143] Additionally or alternatively, the cooling air may be directed into / though the insulation (e.g. where the insulation is air permeable).

[0144] The conduit 34 may comprise a means to guide the cooling air 102 thereabout. For example, the guide may be configured maximise contact time between the coiling air 102 and the conduit 34. The guide may comprise protrusions, ridges, channels, pipes, fins etc. As shown in figure 13, the guide may be configured to direct air in cyclonic / helical path around the conduit 34. The guide may comprise a helical pipes, channels, or fins accordingly.

[0145] In some embodiments, the conduit 34 comprises a heat sink and / or heat exchanger. The heat sink / exchanger may comprise any suitable form. The heat sink / exchanger may comprise fins or baffles. Typically, the cooling air is directed over the heat sink / exchanger to provide cooling thereof.

[0146] In some embodiments, the cooling air may be freely movable within the device (i.e. the air may take any suitable path through the device between the secondary inlet 100 and inlet 98. In other embodiments, cooling air may be guided, for example, using pipes / channels or the like. The cooling air 102 may be configured to cooling any suitable component in the device 2. For example, the cooling air may cool some or all of the electronics within the device 2. The cooling air may be directed across a PCB or the like. The cooling air may be used to cool the power supply. Typically, the cooling air is provided by the air at ambient temperature. In some embodiments, the air may be actively cooled.

[0147] It can be appreciated that in any of the above embodiments, only a portion of the total airflow through the device 2 passes through the heating chamber 24. The remaining airflow (i.e. that entering via the inlet 98) thus bypasses the heating chamber 24. The bypass airflow is typically less than the airflow through the heating chamber 24. For example, the bypass airflow is less than or equal to 30% of the total airflow through the device 2; preferably, less than or equal to 20%; preferably, less than or equal to 10%; preferably, less than or equal to 5%; preferably, less than or equal to 2%.

[0148] Referring to figure 14, the heating chamber 24 comprises a tapered outlet 108. The outlet 108 comprises a smooth / curved transition to reduce air turbulence / resistance entering the outlet 108. The conduit 34 is operatively connected to the tapered outlet 108.

[0149] A thermal break 106 is operatively provided between the heating chamber 24 (i.e. the outlet thereof 108) and the conduit 34. The thermal break prevents or limits heat transfer between the heating chamber 24 and the conduit 34. This may help to prevent the conduit 34 becoming excessively hot and / or the heating chamber 24 losing excessive thermal energy. This helps to thermally isolate the heating chamber 24 from the remainder of the device 2. The thermal break also helps ensure a significant temperature gradient between the heating chamber 24 and the conduit 34 so that the conduit can cool the gases / vapour passing therethrough in use.

[0150] The thermal break 106 is provided at an end 110 of the conduit adjacent the heating chamber 24. The thermal break 106 is thus provided at the interface between the heating chamber 24 and the conduit 34. Substantially the full length of the conduit 34 is therefore thermally isolated from the heating chamber 24. The thermal break 106 physically separates the conduit 34 and heating chamber 24, such that they form completely separate, divisible / discrete portions, whilst remaining in fluid communication. The end 110 of conduit 34 is therefore spaced from the heating chamber 24. A cavity 112 is provided between the heating chamber 24 and the conduit 34. This limits heat transfer therebetween.

[0151] A portion of the conduit 34 and heating chamber 24 are received within the thermal break 106. The thermal break 106 thus surround a portion of the conduit 34 and the heating chamber 24 accordingly. The thermal break 106 is annular / cylindrical. The thermal break 106 may therefore provide a sleeve, pipe, tube or channel. In some embodiments, the thermal break 106 may comprise a relatively small axial length. The thermal break 106 may comprise a ring or the like. The internal walls of the thermal break taper inward toward a central portion thereof. This limits movement of the heating chamber 24 and the conduit 34 therein to provided separation thereof (i.e. provide a stop member). The tapering walls provide a ridge 114 or the like within the thermal break 106. In some embodiments, the stop member comprises a step or flange.

[0152] The thermal break 106 comprises a low thermal conductivity (i.e. thermally insulating) material. The material may comprise a polymer. The material may comprise heat resilient silicones or the like. The material may comprise an elastomer (e.g. rubber). The material may comprise a ceramic.

[0153] In some embodiments, the thermal break 106 is loosely connected to the heating chamber 24 and / or conduit 34. For example, the thermal break may be connected to the heating chamber 24 and / or conduit 34 via a friction or interference fit. The heating chamber 24 and / or the conduit 34 may comprise flanges or rims at the ends thereof to provide an interference / friction fit the with thermal break 106.

[0154] In some embodiments, the thermal break 48 may merely abut against the conduit 34 and / or heating chamber. The thermal break 48 may held firmly in place due the construction of the device. The thermal break 48 may comprise a soft and / or deformable material. In some embodiments, the thermal break 106 may be sealed against the heating chamber 24 and / or conduit 34 (e.g. to prevent escape of the vapour). The thermal break may be secured to the heating chamber 24 and / or conduit 34 (e.g. to form a permanent seal / attachment). The thermal break may be welded and / or moulded to the heating chamber 24 and / or conduit 34.

[0155] In some embodiments, the thermal break 106 may partially separate the conduit 34 and heating chamber 24 or conduit portions. For example, the conduit 34 and heating chamber 24 or conduit portions may be connected by one or more bridge portions to provide structural rigidity therebetween. The thermal break 106 then fills the area between the bridges. In the embodiment shown in figure 17, the thermal break 106 is provided part way along the conduit 34. The conduit 34 may therefore be divided into separate portions. The thermal break 106 may be provided at any suitable position along the length of the conduit 34, depending on the thermal insulating requirements. Typically, the thermal break 106 is provided toward the heating chamber end 110 of the conduit, to ensure maximal thermal insulation. However, the thermal break may be toward the container 6 end where other cooling methods may be used (e.g. air cooling). For example, the thermal break may be provided at the interface between the electronics compartment 14 and the container 6 (i.e. the lid 98).

[0156] In some embodiments, the thermal break 106 is provided within the heating chamber 24. The thermal break 48 may thermally separate a heated and non-heated part of the heating chamber 24. For example, the thermal break 106 may thermally separate the side walls 116 and the base 118 of the heating chamber 24. In some embodiments, the base 52 provides the thermal break 48 (i.e. the base is formed of thermally insulating material).

[0157] Referring to figures 15 and 16, the heating chamber 24 is surrounded by a thermal insulator 118. This may help to prevent excessive heat being transferred into the head portion 4 and / or electronics chamber 12. The thermal insulator 118 surrounds a portion of the sides 116 of the heating chamber 24. The insulator 118 comprises an aperture 120 to receive the heating chamber 24. The insulator 118 may therefore be annular or disc shaped. The insulator 118 provides a tight / close fit with the heating chamber 24 (e.g. engages the heating chamber 24).

[0158] The insulator 118 comprises recesses or pockets 122 configured to receive various components of the device (e.g. electronic components). The components are therefore at least partially received within the insulator. The insulator 118 spans the whole width of the head portion and may engage / abut the walls or casing thereof.

[0159] The insulator 118 surrounds a portion of the heating chamber 24. As best seen in figure 16, the insulator 118 extends between a midpoint of the heating chamber (i.e. in the vertical direction in use) and the upper end 124 or rim of the heating chamber 24. The insulator 118 thus surrounds the opening of the heating chamber 24 configured to receive the capsule. The device 2 comprises an inlet connector 126, e.g. in the form of a short passage or seal, fluidly connected to the air inlet 28. The connector 126 engages the capsule in use to direct air thereinto. The connector 126 comprises a conical or flared shape. The insulator 118 surrounds the connector 126. This helps to prevent thermal losses at the interface between the connector 126 and the capsule in use.

[0160] The insulator 118 comprises a layered, staggered or stepped arrangement. This allows easy manufacture, whilst conforming to the shape of the head casing 128 (see figure 14).

[0161] In some embodiments, the thermal insulator 118 may be corresponding in shape to the heating chamber 24 or the walls 26 thereof (see figure 17). The insulator 118 may therefore be frustoconical / trapezoidal or provide a cup or tray like shape. The insulator may be generally concave (e.g. tray or cup shaped). The insulator 118 may be shaped to receive the heating chamber outlet 108. In some embodiments, the thermal insulator may surround or abut the top and / or bottom of the heating chamber 24. The thermal insulator 118 may be circular in plan.

[0162] In some embodiments, a thermal insulator 118 is provided in the lid 22 of the device 2. The insulator 118 may be provided on a portion of the lid 22 facing the heating chamber 24. The thermal insulator may be configured to engage the heating chamber 24 and / or capsule located therein. The thermal insulator may comprise apertures therein to allow air to pass therethrough.

[0163] A second thermal insulator 130 is configured to provide thermal separation between the head portion 4 and the neck portion 12. As best seen in figure 14, the insulator 130 is provided proximal the interface between the head portion 4 and the neck portion 12. The insulator 130 is configured to surround the thermal break 106 in this example. The insulator 130 thus surrounds the conduit 34 accordingly. The insulator 130 spans the width of the neck portion 12. The insulator 130 may seal or abut against the wall / casing 132 of the neck portion 12.

[0164] The second insulator 130 comprises a circular or disc like arrangement. An aperture allows the thermal break 106 to extend therethrough. The insulator is thus annular. The insulator 130 provides a tight / close fit with the thermal break 106 (e.g. engages the thermal break 106).

[0165] The conduit 34 comprise a thermal insulator 134. The thermal insulator 134 encloses / envelopes the conduit 34 (i.e. extend about the complete circumference thereof). The insulator 134 is cylindrical / tubular. The insulator 134 may extend along part or the full length of the first conduit portion 34A. The insulator therefore extends between the thermal break 106 and the end first conduit portion 34A.

[0166] The insulator 134 comprises two portions 134A and 134B. The first portion 134A is provided toward the thermal break 106. The second portion 134B is provided distal the thermal break 106 (i.e. toward the lid 90). The first portion 134A is relatively thicker than the second portion. This provides greater thermal insulation toward the heating chamber 24. The thickness of the first portion 134 may be 50%-150% greater relative to the first 134A; preferably, 75%-125%. The first portion 134A and second portion 134B are approximately the same axial length. The conduit 34 may comprise an exposed portion 136 (i.e. with no insulation) toward the lid end thereof. This allows the conduit 34A to be received within the neck chassis (see figure 5).

[0167] In some embodiments, the insulator 134 may extend the complete length of the conduit 34 (i.e. both conduit portions 34A and 34B). Where the thermal break is provided part way along the conduit 34, the insulator 134 may extend between the thermal break 106 and the heating chamber 24 and / or between the thermal break 106 and the end of the first conduit portion 34A. Any portion of the conduit 34between the heating chamber 24 and the lid 90 may comprise insulation.

[0168] The insulator comprises a high-temperature resistant material (i.e. a material that does not melt / burn at temperature of 200°C or more). The insulating material may comprise a ceramic (e.g. aluminosilicate). The insulating material may comprise a mineral (e.g. glass). The insulating material may comprise mica. The insulating material may comprise a refractory material. The insulting material may comprise fibres. The insulating material may comprise a wool or textile. The insulting material may comprise a moulded or sintered piece (i.e. a solid or rigid piece). The insulating material may be provided as tiles or layers.

[0169] The insulting material 118,130,134 may be affixed to the heating chamber 24, conduit 34 and / or lid 22 respectively. The insulating material may be bonded thereto. The insulating material may be integral with or moulded to the heating chamber 24 / conduit 34 / lid 22. In some embodiments, the insulator 118,130,134 comprises a multi-layered construction. For example, the inner surface comprises a thermal conductive material configured to transfer heat from the heating elements, and a thermally insulating outer layer. Where the insulator 118,130,134 is provided on the conduit 34 and the heating chamber 24, the insulator 118,130,134 may comprise a continuous / solid / integral piece. In other embodiments, the insulator 118,130,134 may be detachable / removable from the heating chamber 24 / conduit 34 / lid 22.

[0170] The insulator 1 18,130,134 may comprise a coating or layer (e.g. on the conduit 34). The layer may be thin (e.g. less than 1 mm).

[0171] A valve is provided to prevent fluid (e.g. air or coolant) flow from the tank 2 to the heating chamber 24. The valve is unidirectional. The valve is provided in the conduit 34 or at an end formation thereof. The valve may be provided in the first portion 34A of the conduit, e.g. in the vicinity of the electronics compartment 12 or at the interface between the water tank and compartment 12.

[0172] In the examples of figures 18A and 18B, the valve 140 is provided in the second portion 34B of the conduit 34, i.e. towards its distal end. The valve 140 is provided in the portion of the conduit within tank 6 such that the valve is submerged in water for use.

[0173] The valve 140 may be provided in or adjacent the diffuser 36.

[0174] A shown in figure 18, the valve 140 comprises a valve seat 142 and a moveable valve member 144 that can move between a closed position, in which it engages the seat 142, and an open position in which it is displaced form the seat. In the open position, the space between the valve member 144 and seat 142 allows flow through the valve and outwardly though the diffuser 36 and / or conduit end.

[0175] The valve seat 142 is formed as a discontinuity, step or taper in the internal wall of the conduit 34. The narrower internal bore of the conduit is of width less than the valve member 144, whereas the wider bore of the conduit 34 is sufficient to receive the valve member therein.

[0176] The valve member 144 in this example is a float member (for example a simple polymer ball or bead ). This has been found to provide a beneficial, natural bias of the valve to the closed position due to the difference in density between the float and the water in the tank. Thus whenever the valve is submerged, it is naturally closed. The creation of a negative pressure in the water tank upon drawing on the mouthpiece by the user, and the resulting flow along the conduit 34, easily displaces the valve member 144 from its seat against its buoyancy.

[0177] The natural bias of the float valve 144 onto the valve seat 142 by way of its buoyancy means that water is prevented from flowing up the conduit towards the heating chamber 24. This is particularly important if the user exerts a positive pressure when purging the air within the tank 6 or by inadvertently coughing through the mouthpiece, etc. In such an instance, the positive pressure applied by the user will urge the valve member 144 onto the valve seat 142 more forcefully.

[0178] It has been found that the float valve, either alone or in conjunction with the diffuser 36, creates a low resistance to flow through the conduit and therefore does not impede the user’s experience using the device. That is to say, whilst other valves could be used, the float valve has been found to particularly apt for the water pipe configuration described herein. When a user applies negative pressure, the valve member is easily displaced with very little effort.

[0179] When the valve member 144 is in the vicinity of lateral openings, i.e. the outlet of the smoke pipe, it can help urge the flow laterally through those openings.

[0180] The difference between the arrangements of figures 18A and 18 B concerns the means by which the valve member 144 is restrained, i.e. the stop member 146 used to limit the freedom of movement of the valve member 144 and / or prevent the valve member from leaving the conduit 34. In figure 18A, the stop member 146 comprises a clip or collar attached to the conduit, e.g. in the vicinity between the flow openings of the diffuser. In the example of figure 18B, the stop member 146 takes the form of an end stop or plug inserted into the end of the conduit 34. The stop member 146 in this example has a flow opening, e.g. of width smaller than the valve member 144, so as to permit flow therethrough but prevent passage of the valve member 144.

[0181] In various embodiments, the use of the stop member 146 of figure 8B may allow a valve member of greater density than water to be used, i.e. such that the valve member 144 would naturally sink so as to close off the flow opening through the stop member 146. In such an arrangement, the stop member 146 could act in a manner akin to a valve seat. Positive pressure applied to the interior of the water tank via the hose would raise the valve member 144 against the valve seat 142. As such as small difference in density between the valve member 144 and coolant / water, whether of positive or negative buoyancy, can be used to ensure suitable operation of a submerged valve.

[0182] In other embodiments, a suitable valve may be provided on / near the heating chamber 24, e.g. at an outlet of the heating chamber 24. For example, the valve may be provided in a curved outlet thereof, in a bottom wall of the heating chamber or in the vicinity of the thermal break. In some embodiments, the valve may be provided at the inlet 28, or in the hose 14, hose connector 18 and / or mouthpiece 20. It can be appreciated that the valve may be provided in any suitable position between the inlet 28 and the mouthpiece 20. However valves that are not submerged in the water tank 6 will typically require an alternative type of valve, such as a duckbill valve, diaphragm, ring value or other conventional one-way valve. It is also possible that a very light valve member could be displaced by air, rather than water to provide a valve arrangement similar to the arrangement 140 that is not submerged in a liquid. Any rising liquid in the conduit, could displace the valve member to close. Additionally or alternatively, the flow of air towards the heating chamber 24 up the conduit ma itself be sufficient to displace the valve member to close.

[0183] Although the present embodiment has been described in the context of an electronically heated shisha, it can be appreciated that such features may be used in conventionally heated shisha (e.g. where charcoal or the like is used to heat / burn the shisha product). In some embodiments, a capsule may not be provided and the smoking product may be place directly into the heating chamber or a bowl therein.

[0184] The consumable product may comprise a tobacco-based product. The consumable product may comprise non-tobacco product. The consumable product may comprise cannabis, tea or other plant based material intended to bring about a desirable sensation or therapeutic effect for the user when vapour given off by the heated product is inhaled.

Claims

Claims1 . A water pipe comprising : a heating chamber for heating and vaporising a consumable product in use; a coolant reservoir for cooling the vapourised consumable product; an inlet in to provide air into the heating chamber; an outlet through which a user can inhale the vaporised smoking product, the outlet being downstream of the coolant reservoir in a flow pathway through the water pipe from the inlet through the heating chamber and coolant reservoir to the outlet; wherein the air pathway comprises a second air inlet to provide air into the air pathway at a point between the inlet and the outlet and an adjustment mechanism for the second air inlet.

2. A water pipe according to claim 1 , where the adjustment mechanism provides adjustment of the effective flow area through the second air inlet.

3. A water pipe according to claim 2, where the adjustment mechanism comprises an aperture in a channel or conduit defining a portion of the air pathway, and a movable member selectively movable to vary the open area of the aperture.

4. A water pipe according to claim 3, where the movable member comprises rotatably or linearly movable slider.

5. A water pipe according to claim 3 or 4, where the one of the movable member and the channel comprises plurality of differently sized apertures, the differently sized apertures selectively alignable with a further aperture in the other of the movable member and the channel.

6. A water pipe according to any of claims 3-5, where the movable member is movable to a position where the aperture is completely obscured.

7. A water pipe according to any of claims 3-6, where the movable member is biased or selectively retainable in one or more open or closed position.

8. A water pipe according to any preceding claim, where the device comprises a hose and / or a mouthpiece, and the second air inlet is provided at a point in the air pathway provided by the hose and / or mouthpiece.

9. A water pipe according to claim 8, where the mouthpiece comprises a handle portion, and second air inlet is provided on the handle portion.

10. A water pipe according to any preceding claim, where the second air inlet opens into the interior of the fluid container.

11. A water pipe according to claim 10, where the fluid container comprises a closure, and the second inlet is provided on the closure.

12. A water pipe according to any preceding claim, where the fluid container further comprises a purge valve to allow unidirectional purging of air within the fluid container.

13. A water pipe according to claim 12, where the second inlet is provided on valve seat on the purge valve.

14. A water pipe according to any preceding claim, comprising a further air inlet to provide air into the air pathway at a point between the inlet and the outlet, said further air inlet being separate from the second air inlet.

15. A water pipe according to claim 14, where the further air inlet comprises one or more fixed / simple opening and / or is non-adjustable.

16. A water pipe according to any preceding claim, where a compartment is provided between the heating chamber and the coolant reservoir, and the second inlet provides fluid communication between the compartment and the coolant reservoir.

17. A water pipe according to claim 16, wherein the compartment comprises an inlet, such as a grating or grille, to provide fluid communication with the compartment and the ambient environment.

18. A water pipe according to any preceding claim, wherein a conduit for the air pathway is provided between the heating chamber and the coolant reservoir, the cross- sectional / flow area of conduit preferably varying along its length.

19. A water pipe according to claim 18 wherein air from the second inlet is directed over the conduit to provide cooling thereof.

20. A water pipe according to claim 18 or 19, wherein the conduit comprises a constriction therein to accelerate and / or induce turbulence to flow towards the coolant reservoir.21 . A water pipe according to claim 20, wherein the conduit comprises a first and second portions in flow series between the heating chamber and coolant reservoir, the first conduit portion comprising a greater cross-sectional airflow area than the second portion.

22. A water pipe according to claim 21 , wherein the device comprises a compartment adjacent the fluid container, and first conduit portion passes through the compartment, the second conduit portion extending from the compartment into in the coolant reservoir.

23. A water pipe according to any of claims 18-22, wherein the conduit comprises a widening or diffuser.

24. A water pipe according to any of claims 18-23, wherein the conduit comprises a valve seat formation therein and a float valve member is arranged to engage selectively with the valve seat formation in accordance with its buoyancy relative to the coolant.

25. A water pipe according to any of claims 18-24, comprising a thermal break configured to thermally isolate at least a portion of conduit from the heating chamber.

26. A water pipe according to claim 25, where the thermal break is at an interface between the heating chamber and the conduit.

27. A water pipe according to any one of claims 18-26, comprising a thermal insulator to receive or be received by the conduit and / heating chamber.

28. A water pipe according to any one of claims 18-27, where the heating chamber is provided in a first compartment and the conduit is provided in a second compartment, and the thermal insulator is configured to thermally separate the first and second compartment.

29. A water pipe according to claim 28, where the insulator comprise a plate or disc configured to surround the conduit.

30. A water pipe according to any of claims 27-29, where the thermal insulator comprise a sleeve or coating on the conduit.

31. A water pipe comprising: a heating chamber for heating and vaporising a consumable product in use; a conduit extending between the heating chamber and a coolant reservoir to provide a pathway for the vapour therebetween; and a thermal insulator or break configured to thermally isolate at least a portion of conduit from the heating chamber.

32. A water pipe comprising: a heating chamber for heating and vaporising a consumable product in use; a conduit extending between the heating chamber and a coolant reservoir to provide a pathway for the vapour therebetween; the conduit being profiled to define a varying flow area of the air pathway along its length.

33. A water pipe comprising : a heating chamber for heating and vaporising a consumable product in use; a conduit extending between the heating chamber and a coolant reservoir to provide a pathway for the vapour therebetween, the conduit comprising an outlet that opens into coolant in the reservoir; a valve for the vapour pathway to permit flow along the conduit in a direction from the heating chamber to the coolant reservoir and to prevent return flow of coolant along the conduit towards the heating chamber, said valve comprising a moveable valve member held within the coolant and having a density that differs from that of the coolant such that the valve member is biased towards a closed condition when at rest, wherein a flow along the conduit from the heating chamber to the coolant reservoir displaces said valve member to an open condition.

34. A water pipe according to claim 33, wherein the valve comprises a valve seat and the valve member is displaceable to and from the valve seat between the open and closed conditions.

35. A water pipe according to claim 33 or 34, wherein the valve member comprises a float.

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