Liquid heating appliance

Abstract

A liquid heating appliance (2) comprising a reservoir (4) comprising first and second chambers (32, 34) separated by a partition (36), and heating means arranged to heat liquid within the first chamber (32). A mode valve (38) is provided to selectively allow liquid to flow between the first and second chambers (32, 34). The appliance (2) is operable in a first mode in which the mode valve (38) is closed and only liquid in the first chamber (32) is heated, and a second mode in which the mode valve (38) is open and liquid in both the first and second chambers (32, 34) is heated. A dispensing outlet (18) is movable between a dispensing position in which liquid is allowed to be dispensed from the first chamber (32), and a non-dispensing position in which liquid cannot be dispensed. The dispensing outlet (18) is mechanically coupled to the mode valve (38) such that when the dispensing outlet (18) is moved to the dispensing position, the mechanical coupling closes the mode valve (38), and when the dispensing outlet (18) is moved to the non-dispensing position, the mechanical coupling opens the valve.

Description

Technical Field

[0001] This application relates to liquid heating appliances, and more particularly to a liquid heating appliance capable of selectively heating a small amount of liquid. Background Technology

[0002] Liquid heating appliances, such as kettles, are common in many homes. Kettles are used to heat water, typically up to 1.7 liters in volume, to boiling. However, users often only need to heat a relatively small amount of water, say, if they are making a single hot drink. Depending on the specific kettle used, it can be difficult to accurately fill the kettle with the right amount of water for a single drink, so kettles are often overfilled. This overfilling results in more energy being required to heat that volume of water to the desired temperature. Since kettles typically have a fixed power output, this ultimately means that users have to wait longer for the water to reach the desired temperature. Furthermore, this not only means that users have to wait longer, but the extra energy required to heat the excess volume of water is often wasted because the excess water usually remains in the kettle and cools down. With millions of people worldwide using kettles multiple times a day, the amount of energy wasted heating large amounts of unused water is significant. Summary of the Invention

[0003] The present invention aims to provide an improved appliance. From a first aspect, the present invention provides a liquid heating appliance, comprising:

[0004] A reservoir comprising a first chamber disposed below a second chamber and separated by a partition extending between the two.

[0005] A heating device, the heating device being arranged to heat a liquid contained in the first chamber during use;

[0006] A mode valve, arranged in the partition to selectively allow liquid to flow between the first chamber and the second chamber, wherein the apparatus is arranged to operate in a first mode and a second mode, in the first mode the mode valve is closed and only the liquid in the first chamber is heated, and in the second mode the mode valve is open and the liquid in both the first chamber and the second chamber is heated by the heating device;

[0007] A dispensing outlet is disposed on the outer wall of the appliance and movable between a dispensing position and a non-dispensing position, wherein in the dispensing position the dispensing outlet is in fluid communication with the first chamber to allow dispensing of liquid from the first chamber during a first mode, and in the non-dispensing position liquid cannot be dispensed; wherein the dispensing outlet is mechanically coupled to the mode valve such that when the dispensing outlet is moved to the dispensing position the mechanical coupling closes the mode valve, and when the dispensing outlet is moved to the non-dispensing position the mechanical coupling opens the mode valve.

[0008] Therefore, the liquid heating appliance can operate in two different modes. The appliance can operate in a first mode, the "hot cup" mode, where the mode valve is closed. In this mode, it dispenses a fixed volume of liquid directly from the first chamber through the dispensing outlet. In this mode, the appliance can quickly heat smaller volumes of liquid when needed. The appliance can also operate in a second mode, where the mode valve is open. The second mode, with the mode valve in the open position, can be considered to correspond to the "kettle" mode, as all the water in the appliance will be heated. In the second mode, the dispensing outlet is in the non-dispensing position, and liquid cannot be dispensed from the dispensing outlet. Instead, liquid can be poured out of the appliance, for example, through the spout. Users can select the type of operation by controlling the position of the mode valve, depending on the volume of liquid they wish to heat. The ability to selectively heat smaller volumes of liquid reduces the amount of energy wasted when heating large amounts of unused water.

[0009] By connecting the distribution outlet to the mode valve, the operating mode of the appliance can be controlled by the relative position of the distribution outlet. This provides a convenient means of controlling appliance operation. Furthermore, using the distribution outlet to control operation can be a particularly intuitive way to control appliance operation. Moreover, the position of the distribution outlet can provide the user with an indication of which mode the appliance is configured to operate in. For example, when the distribution outlet is in the distribution position, the user can easily determine that the appliance is configured to operate in the first mode. Mechanical connections may include, for example, mechanical linkages.

[0010] For example, a dispensing position may correspond to a dispensing outlet protruding from the appliance, while a non-dispensing position may correspond to a dispensing outlet retracting from the appliance. Therefore, the dispensing outlet can be arranged to selectively protrude, slide, pivot, or rotate from the dispensing position to the non-dispensing position, and vice versa. The dispensing outlet can be positioned at any suitable location on the appliance. For example, the dispensing outlet can be positioned on the side wall of the appliance. This allows the user to easily dispense from the appliance, such as into a container like a cup or mug. The dispensing outlet can be resiliently biased toward the dispensing position and / or the non-dispensing position. Resiliently biasing the dispensing outlet helps ensure that the dispensing outlet remains in its corresponding position even when the appliance is moved. For example, when operating in a second mode, i.e., kettle mode, the appliance can be lifted and tilted. Resiliently biasing the dispensing outlet helps ensure that the dispensing outlet remains in the non-dispensing position when the appliance is lifted and tilted. Furthermore, resiliently biasing the dispensing outlet to one or both of the two positions helps ensure that the dispensing outlet reaches its intended position completely when moved. Flexible biasing of the distribution outlet to the distribution location allows the distribution outlet to be moved to the distribution location more easily.

[0011] In the first operating mode with the mode valve closed, i.e., the hot cup operating mode, when the heating device is activated, it will raise the temperature of the liquid in the first chamber. Since the liquid in the first chamber cannot leak out, its temperature will continue to rise. As the temperature rises and eventually reaches boiling, the pressure in the first chamber will increase. This pressure can be used as a means to force the liquid out of the first chamber to the dispensing outlet. Of course, additional or alternative dispensing devices can be provided, such as a pump arranged to draw hot water from the first chamber.

[0012] With the mode valve open, i.e., the appliance operating in the second mode, when the heating device is activated, for example, when powered, the liquid in the first chamber will be heated, and convection will occur. This convection will cause the heated liquid to flow out of the first chamber and into the second chamber, thus heating the liquid in the second chamber, while cooler liquid from the second chamber flows into the first chamber to be heated therein. After a sufficient period of time, the entire volume of liquid in the reservoir will reach boiling.

[0013] Although the mode valve opens in the second mode, allowing fluid to flow between the first and second chambers, in some cases, heated liquid may be pushed toward the dispensing outlet, depending on the pressure generated in the appliance when the liquid is heated. Therefore, in one set of embodiments, the appliance further includes a fluid flow path disposed between the first chamber and the dispensing outlet, wherein the flow path includes a dispensing valve configured to have at least an open configuration and a closed configuration, wherein in the open configuration, liquid can flow through the dispensing valve, and in the closed configuration, liquid flow is prohibited through the dispensing valve, and wherein the dispensing outlet is coupled to the dispensing valve such that the dispensing valve has an open configuration when in the dispensing position and a closed configuration when in the non-dispensing position.

[0014] When the appliance is operating in the second mode, such a distribution valve can be used to prevent unwanted liquid from flowing out of the distribution outlet. This can be particularly important because without such a distribution valve, hot liquid could leak through the distribution outlet, potentially causing injury. The connection between the distribution outlet and the distribution valve allows the distribution valve to have a closed configuration when the distribution outlet is in the non-distribution position, ensuring that the distribution valve is closed whenever the distribution outlet is in the non-distribution position, i.e., when the appliance is in the second mode. This connection eliminates the need for the user to operate the distribution valve independently.

[0015] A distribution valve can be any valve suitable for suppression, i.e., preventing liquid from flowing out through the distribution outlet. It does not necessarily have to completely close the flow path, as long as it prevents liquid from flowing through it. The distribution valve and the distribution outlet can be connected in any suitable manner. For example, the distribution outlet can be mechanically connected to the distribution valve.

[0016] Optionally, the distribution outlet can be electrically connected to the distribution valve. For example, when in the non-distribution position, the distribution valve can operate an electric switch configured to operate an electrically controlled valve.

[0017] In one set of embodiments, the dispensing valve includes a deformable conduit in the flow path and is configured such that, in the closed position, the conduit deforms to prevent liquid from flowing through it. This deformable conduit provides a simple and reliable method for dispensing valves. The deformable conduit can be deformed directly from the dispensing outlet. For example, the conduit can be attached to the body of the appliance at one end and to the dispensing outlet at the other end. Movement of the dispensing outlet from the dispensing position to the non-dispensing position can cause deformation of the deformable conduit, such as bending, so that liquid can no longer flow through it. The dispensing outlet can include any suitable means for achieving this deformation. For example, deformation can be achieved by a foldable conduit. This folding may be caused by the installation of the conduit and movement of the dispensing outlet. Furthermore, or alternatively, the dispensing outlet can be arranged to physically press against the conduit, thereby causing deformation. For example, the dispensing outlet can include a protrusion configured to act on the conduit when the dispensing outlet moves to the non-dispensing position.

[0018] The way a conduit deforms can at least partially determine whether liquid can pass through it. Therefore, controlling how the conduit deforms can be important to ensure that it effectively prevents liquid from flowing through it. Thus, in one set of embodiments, the conduit includes a region with a reduced wall thickness. The reduced wall thickness allows the conduit to reliably deform in a predictable manner, thereby preventing liquid from flowing through it. This, in turn, ensures that the dispensing valve reliably stops liquid flow.

[0019] In another set of potentially overlapping embodiments, the catheter includes at least a first portion having a first cross-section and a second portion having a different second cross-section. Similar to the reduced-thickness wall segments, different cross-sections can be used to more reliably control the location and manner of catheter deformation. For example, the catheter may include a first portion having a circular cross-section and a second portion having an elliptical or circular-rectangular cross-section. In the case of an elliptical cross-section, the ellipse may, for example, have a major axis matching the diameter of the circular cross-section, but a minor axis smaller than the diameter of the circular cross-section. Any suitable combination of cross-sections can be used to appropriately control how the catheter deforms. In embodiments with both reduced wall thickness and different cross-sections, the reduced-thickness segment may be aligned with a different second cross-section. Therefore, such a combination can allow for further control over how the catheter deforms.

[0020] Deformable conduits can be made from any suitable material capable of repeated deformation. In one set of embodiments, the conduit is formed of silicone. Silicone can be cured. Silicone may be particularly suitable due to its resilience to deformation. In other words, silicone tubing can be deformed multiple times and allowed to return to its original shape, thus making it suitable for use in household appliances, where the operating mode can be changed multiple times over the appliance's lifespan.

[0021] When operating in the first mode, as described above, liquid can be ejected from the first chamber under vapor pressure. In some cases, as vapor pressure builds up in the first chamber, the liquid distribution from the first chamber may be turbulent. Therefore, in one set of embodiments, the appliance also includes a distribution chamber arranged in the fluid flow path between the first chamber and the distribution outlet, such that the liquid passes through the distribution chamber first before flowing out of the distribution outlet. The distribution chamber provides a separate space for the heated liquid and vapor, allowing the heated liquid to be distributed from the distribution outlet in a more controlled manner, while substantially less vapor is distributed along with the heated liquid. This can provide a more controlled laminar distribution of the liquid, potentially safer for the user. For example, the distribution chamber may include a weir over which the liquid must pass before reaching the distribution outlet. Such a weir can be used to ensure that any cold liquid that was not distributed in previous operations is mixed with the newly heated liquid before distribution, thus ensuring that the distributed liquid is hot. The weir can also be used to ensure that the heated liquid and steam arriving at the distribution chamber have a chance to be properly separated before the heated liquid can be distributed, thereby reducing the amount of steam distributed from the distribution outlet.

[0022] In embodiments that include a dispensing chamber and a dispensing valve, the dispensing valve may be positioned upstream or downstream of the dispensing chamber relative to the flow of heated liquid flowing to the dispensing outlet. In one set of embodiments, the dispensing valve is located downstream of the dispensing chamber. This can advantageously mean that, when the appliance is in a second operating mode, the dispensing valve also prevents any liquid leaking from the dispensing chamber from flowing out. For example, the dispensing chamber may contain small amounts of liquid that were not dispensed during previous hot cup operations, which, conversely, would have leaked from the dispensing outlet without the dispensing valve.

[0023] A dispensing chamber may be disposed within a second chamber, preferably above it. In one set of embodiments, the dispensing chamber includes a liquid inlet communicating with a first chamber, a first liquid outlet communicating with a dispensing outlet, and a second liquid outlet communicating with a second chamber to allow undispensed liquid to flow back into the second chamber. In another set of embodiments, the dispensing chamber includes a valve element arranged to selectively close either the first or second liquid outlet. Such a valve element may allow selective closure of the first liquid outlet, thereby preventing liquid flow to the dispensing outlet, and may also allow selective opening and closing of the second liquid outlet to control whether liquid can freely flow back into the second chamber. For example, such a valve element may be coupled to a “STOP” button that a user can operate to stop dispensing operations in hot cup mode.

[0024] The fluid flow path between the first and second chambers, for example, a fluid flow channel connecting the outlet on the first chamber to the liquid inlet on the distribution chamber, can be open in both the first and second operating modes. As a result, although the mode valve is open between the first and second chambers, some heated water can be driven toward the distribution chamber. While in some embodiments this may ultimately prevent leakage through the distribution outlet, for example, through the presence of the distribution valve, it may still be necessary to prevent heated liquid from reaching the distribution chamber when operating in the second mode, to further prevent unwanted liquid from flowing out of the distribution outlet.

[0025] In one set of embodiments, the appliance also includes a fluid connection conduit connecting the first chamber to the dispensing chamber, wherein the connection conduit follows a tortuous path. The tortuous path increases the length of the flow path and thus provides resistance to fluid flow toward the dispensing chamber. When operating in the second mode, i.e., kettle mode, the total pressure in the appliance is generally lower, so this flow resistance is sufficient to prevent the heated liquid from flowing through the connection conduit. Therefore, this minimizes the ability of water to leak through the dispensing outlet when operating in the second mode. As those skilled in the art will understand, when operating in the first mode, i.e., hot cup mode, despite the tortuous path, the pressure in the first chamber will be sufficient to force the heated liquid through the connection conduit. Therefore, the appliance can operate optimally in both modes.

[0026] In one set of embodiments, the tortuous path includes at least a first bend and a second bend arranged to define an S-shaped bend. The first and second bends defining the S-shaped bend can define a water trap, which, when operating in the second mode, can further help prevent liquid from flowing from the first chamber to the distribution chamber. Another advantage of this arrangement is that the outlet in the first chamber to which the connecting conduit is connected and the inlet in the distribution chamber to which the other end of the connecting conduit is connected do not need to be aligned with each other, as the bend can accommodate any lateral offset of the outlet and inlet. This allows for greater design freedom within the appliance, allowing the outlet in the first chamber and the inlet in the distribution chamber to be in the most suitable positions without being constrained by the connecting conduit extending between them. The use of an S-shaped bend is also advantageous because it occupies minimal space within the appliance while still providing effective resistance to liquid flow therein.

[0027] In one set of embodiments, the liquid heating appliance has a predetermined maximum fill level, and at least one bend in the tortuous flow path is arranged above the maximum fill level. For example, the at least one bend may correspond to the first bend of an S-shaped bend. For example, the apex of the at least one bend may be arranged above the maximum fill level.

[0028] To prevent liquid leakage from the appliance as a whole, various seals can be provided between different components of the appliance. In one set of embodiments, the mechanical connection includes a mechanical link extending through an opening in the wall that at least partially defines a second chamber, wherein the appliance also includes a sealing member extending around the mechanical link, wherein a first portion of the sealing member seals around the opening and a second portion of the sealing member seals to the mechanical link, and wherein the sealing member is configured such that the second portion of the sealing member is movable relative to the first portion of the sealing member.

[0029] Therefore, the sealing member functions to seal the opening, thereby preventing liquid from leaking out of the appliance through the opening. Furthermore, this particular sealing device advantageously allows the mechanical linkage to move relatively freely within the opening without compromising the integrity of the seal. For example, with the above arrangement, the mechanical linkage may not rub against the sealing member at all when the sealing member is moved by the dispensing outlet. Therefore, wear on the sealing member can be reduced. Moreover, unlike other possible sealing arrangements, such as those through which the mechanical linkage passes and comes into close contact with an O-ring, the movement of the mechanical linkage according to this embodiment may not be impeded by the sealing member. Since the second part can move relative to the first part, the mechanical linkage can move more freely relative to the opening. This helps ensure that the force required to move the dispensing outlet is kept as small as possible, thereby ensuring ease of operation of the appliance.

[0030] Furthermore, the use of the sealing member allows for greater design freedom in how the mechanical linkage connects the dispensing outlet and the mode valve. For example, the sealing member allows for both lateral and vertical movement of the mechanical linkage. Therefore, this allows for improved actuation of the mechanical linkage, enabling it to function more effectively.

[0031] The first and second portions of the valve member may correspond to the first and second ends of the valve member, respectively. Movement of the second portion of the valve member relative to the first portion can be achieved in any suitable manner. For example, the sealing member between the first and second portions may be elastic to allow movement of the second portion relative to the first portion fixed around the opening. In one set of embodiments, the sealing member includes a corrugated structure configured to allow movement of the second portion relative to the first portion. The corrugated arrangement can conveniently allow movement in multiple different directions while providing minimal resistance to such movement. This corrugated structure can also increase the lifespan of the sealing member because it does not necessarily require tension, which could otherwise induce stress in the material of the sealing member. The corrugated structure can have any number of waveforms with any suitable relative dimensions.

[0032] The sealing member can be attached to the opening and to the mechanical linkage by any suitable means. In one set of embodiments, the mechanical linkage includes a groove into which a second portion of the sealing member engages. The groove in the mechanical linkage provides a convenient means for securing the sealing member to the mechanical linkage during appliance assembly. The groove also helps ensure that the sealing member remains firmly fastened to the mechanical linkage, thereby ensuring that the sealing member maintains its ability to effectively seal the opening even as the mechanical linkage moves within its range of motion. The sealing member can be made of any suitable material, such as silicone.

[0033] When the appliance operates in the first mode, i.e., the hot cup mode, as described above, the appliance can utilize the increased pressure in the first chamber to discharge the heated liquid from the first chamber toward the dispensing outlet. However, depending on the specific form of the mode valve, this increase in pressure can also be used to apply a force that tends to open the mode valve. As will be understood, if the mode valve opens during operation in the first mode, the pressure in the first chamber may drop, and the heated liquid may not be forced toward the dispensing outlet. Therefore, in one set of embodiments, the appliance also includes a latching device configured to hold the mode valve in the closed position. Thus, the latching device can be used to hold the mode valve in the closed position and thus resist any opening force applied by the increased pressure. This can advantageously promote the presence of a mode valve that allows for a greater flow of water between the first and second chambers in the second operating mode, i.e., a mode valve with a larger opening, which would otherwise be impossible because the valve is too easy to open during operation in the first mode. When operating in the second mode, this increased liquid circulation capability can improve the operation of the appliance in the second mode, thereby allowing it to heat the contained liquid in a more efficient manner. Keeping the mode valve closed will also ensure that the appliance can operate most effectively in the first operating mode without the risk of the mode valve unintentionally releasing pressure from the first chamber to the second chamber.

[0034] The latching device may include, for example, a resiliently biased latching member. For instance, the latching member can be disengaged from the latched position when the mode valve moves to its closed position, and is biased back to the latched position once the mode valve reaches its fully closed position.

[0035] To move the mode valve to the open position, it may be necessary to release the latching device. In one set of embodiments, the latching device is configured to be released by movement of the dispensing outlet from the dispensing position to the non-dispensing position. Such an arrangement provides a convenient means for the user to release the latching device with a single action when changing the appliance mode via the dispensing outlet. Release can be achieved by applying a sufficiently large force to the dispensing outlet, and the mode valve can release the latching device. However, in one set of embodiments, the latching device is configured to be released via a mechanical connection. Through a mechanical connection, such as a properly designed mechanical linkage and its interaction with the latching mechanism, the latching mechanism can be released with minimal force applied to the dispensing outlet. The latching device can be released by operating a release member, which releases the latch within the latching device.

[0036] While a single latch arrangement has been described above, any number of latches can be included. For example, a latching device can latch a mode valve in multiple positions to ensure that it remains in the closed position.

[0037] The mode valve itself can be any suitable valve for controlling fluid flow between the first and second chambers. The mode valve does not have to be a single valve, but can include multiple valves. In one set of embodiments, the mode valve includes a flap valve. Such a flap valve can provide a valve that can be easily implemented within the space constraints of a liquid heating appliance. Furthermore, the flap valve can be particularly well-suited for operation via a mechanical linkage, and thus can simplify the internal structure of the appliance, thereby minimizing manufacturing costs. In one set of embodiments, the flap valve includes a valve member that is pivotable at a pivot point and arranged to engage with a corresponding valve seat in a partition, thereby closing the flap valve and preventing liquid from flowing through it.

[0038] In one set of embodiments, the valve member is an annular valve member with a U-shaped cross-section. The use of an annular valve member allows another valve, such as a float valve, to be arranged at the center of the partition, i.e., within the space defined by the annular valve member. The partition may have a tapered profile, and the other valve may be arranged at the apex (e.g., the center) of the partition. This can advantageously allow any air in the first chamber to accumulate at the top of the partition and escape through the other valve. The U-shaped cross-section of the valve member can help increase the stiffness of the valve member.

[0039] In another set of embodiments, at least a portion of the wall of the annular valve member has an increased height compared to other portions of the valve member. The height of the wall determines the stiffness of the valve member. Therefore, by providing portions with increased height, the stiffness of the valve member can be increased in areas where it is needed, without having to increase stiffness in areas where it is not needed. This can save the amount of material required to manufacture a suitable valve member. Alternatively, portions of the valve member can have walls with increased thickness. This can also be used to increase the stiffness of the valve member. The portions with increased stiffness can be positioned where the valve member is least supported, such as in the portion furthest from the pivot point, or in the location where a latch is provided. For example, portions with increased stiffness, such as by increased wall height or by increased wall thickness, can be arranged near the central portion of the valve seat, between the provided pivot point and latch point.

[0040] In one set of embodiments, the annular valve member includes a plurality of support fins arranged to increase the rigidity of the annular valve member. The support fins also increase the rigidity of the valve member to ensure that it can seal the flap valve in a proper manner.

[0041] In one set of embodiments, the heating device arranged to heat the liquid in the first chamber is the only heating device in the liquid heating appliance. Because the mode valve allows liquid flow between the first and second chambers when in the open position, the appliance can advantageously require only a single heating device to heat the contents within the appliance in both operating modes. This can help minimize the cost of the appliance.

[0042] Liquid heating appliances may include any suitable means for dispensing liquid from the appliance in a second operating mode, namely kettle mode. In one set of embodiments, the reservoir includes a spout arranged to allow liquid to be poured from the appliance, and a mode valve is arranged in a partition substantially below the spout. The spout may provide a convenient way to allow liquid to be dispensed from within the appliance, a method that the user may already be accustomed to.

[0043] Liquid heating appliances can include any suitable device for stopping operation of the heater when the liquid temperature in a first or second chamber reaches a desired temperature, for example, by cutting off power. For example, a liquid heating appliance can include an electronic controller connected to a thermistor sensitive to the liquid temperature in one or both of the first and second chambers. When the electronic controller detects that a certain state has been reached, such as when boiling has been achieved, it can cut off power to the heating element to terminate heating. In one set of embodiments, the appliance also includes a thermomechanical element arranged to be sensitive to the temperature within the appliance and arranged to cut off power to the heating device when the thermomechanical element detects a predetermined temperature. The thermomechanical arrangement provides a simple and inexpensive means of controlling appliance operation. The predetermined temperature may, for example, correspond to the typical minimum temperature of steam.

[0044] Individual thermomechanical elements can be provided to sense the temperature of the liquid being heated in each of the first and second chambers; however, in one set of embodiments, the thermomechanical elements are arranged for both the first and second chambers. This can be achieved by properly positioning the thermomechanical elements such that they are sensitive to the temperature of the liquid being heated in both the first and second chambers. For example, the thermomechanical elements can be arranged in the upper part of the second chamber and, where provided, close to the dispensing chamber. The provided dispensing chamber may include an opening through which vapor can escape to trigger the thermomechanical elements. The thermomechanical elements may form part of a thermomechanical switching device. The thermomechanical elements may include bimetallic sensors.

[0045] Liquid heating appliances may include a heating device located within a first heating chamber, such as an immersion heating element, to directly heat the liquid contained therein. However, in one set of embodiments, the appliance includes a base plate heating device arranged to heat the base of the first chamber. In another set of embodiments, the liquid heating appliance includes an electric heating element with a sheath.

[0046] The mode valve described in detail above may not be the only valve in the partition between the two chambers. For example, the partition may also include a float valve. Such a float valve may include a float valve member arranged to float and cooperating with a corresponding valve seat, thereby closing the valve to prevent liquid from flowing through it. Such a float valve allows the first chamber to be refilled after liquid is dispensed in the first mode without having to reopen the mode valve. Therefore, the appliance can be operated repeatedly in the first mode without requiring user operation of the valve, thus simplifying user operation.

[0047] The dimensions of the appliance, particularly the volumes of the first and second chambers, can depend on the specific intended use of the appliance. In one set of embodiments, the volume of the first chamber is between 50 ml and 500 ml, for example, 350 ml. Such a volume can correspond to a suitable dispensing volume for a container, such as a mug. Therefore, this allows the user to heat an appropriate amount of water for a single cup of heated liquid. As mentioned earlier, this both speeds up the heating process and reduces the amount of wasted energy. Providing a first chamber with, for example, a volume of 350 ml allows for the dispensing of 250 ml of heated liquid when operating in hot cup mode. The amount of liquid dispensed from the first chamber in hot cup mode can be variable, and this can be controlled in various ways, for example, by blocking the flow of liquid after a certain volume has been dispensed, or by a weir device of variable height.

[0048] Liquid heating appliances can be wired, meaning the power cord can be integrated into the appliance or directly embedded in it. However, in one set of embodiments, the liquid heating appliance is a cordless heating appliance. In another set of embodiments, the reservoir is arranged to mate with a corresponding power base. The reservoir may include a cordless adapter, and the power base may include a corresponding cordless connector. The cordless adapter and corresponding cordless connector on the base allow for a type of reservoir that is positioned on the power base substantially regardless of its relative angular orientation to the power base.

[0049] Liquid heating appliances can be used to heat any suitable liquid, such as water. Attached Figure Description

[0050] Some preferred embodiments of the invention will now be described by way of example only and with reference to the accompanying drawings, wherein:

[0051] Figure 1 A perspective view of a liquid heating appliance operating in a second mode according to an embodiment of the present invention is shown;

[0052] Figure 2 yes Figure 1 A cross-sectional view of the appliance shown;

[0053] Figure 3 yes Figure 1 The sectional view of the appliance shown focuses on the dispensing outlet;

[0054] Figure 4 It is a 3D view of a separate distribution valve;

[0055] Figure 5A and Figure 5B Showing Figure 4 The cross-sectional view of the distribution valve shown;

[0056] Figure 6This is a detailed diagram of the distribution outlet, showing the distribution valve in the closed configuration;

[0057] Figure 7 This is a 3D view of the display mode valve; for clarity, a portion of the appliance has been removed.

[0058] Figure 8 This is a 3D view of the mode valve, in which the valve components have been removed;

[0059] Figure 9 It is a 3D view of a single valve component;

[0060] Figure 10 It is a 3D view of the individual connecting catheter;

[0061] Figure 11 yes Figure 1 The cross-sectional view of the apparatus shown illustrates the components within the dispensing chamber;

[0062] Figure 12 A perspective view of a liquid heating appliance operating in the first mode is shown;

[0063] Figure 13 yes Figure 12 A cross-sectional view of the appliance shown;

[0064] Figure 14 It is a concern Figure 12 The cross-sectional view of the appliance shown focuses on the dispensing outlet;

[0065] Figure 15 It is a cross-sectional view focusing on the valve components and their interaction with the latching device;

[0066] Figure 16 It is a cross-sectional view showing the configuration of the components in the dispensing chamber when the appliance is operating in the first operating mode to heat the liquid; and

[0067] Figure 17 It is a cross-sectional view showing the configuration of the components in the dispensing chamber when the appliance stops midway through operation. Detailed Implementation

[0068] Figures 1 to 11 A liquid heating appliance or a component thereof is shown according to an embodiment of the present invention. In these views, the liquid heating appliance is operating in a second mode, namely a kettle mode. Figure 1A perspective view of a liquid heating appliance 2 (hereinafter referred to as appliance 2) is shown. Appliance 2 includes a reservoir 4 arranged to rest on a power base 6. Both the reservoir 4 and the power base 6 may each include a cordless connector device, such as the mating portion of a 360-degree connector, which allows the reservoir 4 to be positioned on the power base 6 at a range of different relative angular positions. The power base 6 is powered by a power cord 8, which can be plugged into a suitable power source. Although appliance 2 shown in the figure is cordless, this is not mandatory; alternatively, the appliance may be corded.

[0069] The reservoir 4 includes a handle 10 for lifting the device 2, for example, for lifting the device 2 to fill or dispense liquid. A container spout 12 is disposed on the upper front portion of the reservoir 4. An openable cap 14 is disposed on the top of the reservoir 4. As shown, the cap 14 can be held in a closed position by a suitable engagement mechanism and may also include a release button 16 for releasing the engagement of the cap 14 to allow filling of the reservoir 4. The cap 14 can be resiliently biased such that when the release button 16 is actuated, the cap 14 automatically moves upward to expose an opening for filling the reservoir 4.

[0070] The device 2 also includes a dispensing outlet 18 disposed on a side wall 19 of the reservoir 4. The dispensing outlet 18 is pivotally mounted within the side wall 19, as will be shown more clearly in the following figures. Figure 1 In the configuration shown, the dispensing outlet is in the non-dispensing position, which corresponds to the second operating mode. The dispensing outlet 18 includes a recess 20 for the user to press when pushing the dispensing outlet 18 into the shown non-dispensing position.

[0071] An "ON" button 22 is located on the top of the appliance 2 for turning it on. When the dispensing outlet 18 is in the non-dispensing position as shown, pressing the "ON" button 22 will cause the appliance 2 to begin heating the liquid contained therein in kettle mode. An adjustment dial 24 is provided to adjust the volume of liquid dispensed in the first operating mode, i.e., hot cup mode. The adjustment of the liquid volume dispensed in hot cup mode can be achieved in any suitable manner. For example, as will be described in more detail below, the dispensing chamber may include a device that allows at least a portion of the liquid therein to flow back into a second chamber. The adjustment dial 24 can control the amount of liquid allowed to flow back into the second chamber, thereby controlling the amount of liquid dispensed through the dispensing outlet in hot cup mode.

[0072] The “STOP” button 26 is also located on the top of the appliance 2 and can be used to disconnect the power supply to the heating device inside the appliance 2, thereby stopping the heating of the liquid therein. For example, this can be used if the user decides that they no longer wish to heat the liquid.

[0073] The appliance 2 also includes a drip tray 30 disposed below the dispensing outlet 18. When operating in the first mode, i.e., the hot cup mode, as will be described with reference to the following figures, the drip tray 30 can be used to collect overflow liquid from the container filled from the dispensing outlet 18.

[0074] Figure 2 A partial cross-sectional view of device 2 is shown. As shown in the figure, reservoir 4 includes a first chamber 32 disposed below a second chamber 34 and separated by a partition 36. Although not obvious in the figure, partition 36 may be conical, i.e., concave when viewed from the first chamber, with its apex located at the center of partition 36. A mode valve 38 in the form of a flap valve is arranged in partition 36. Mode valve 38 includes a pivotally mounted valve member 40 arranged to pivot to and from contact with a valve seat 42, which defines an opening through partition 36 (not visible in this figure). Although a flap valve is shown in the figure, any suitable valve may be used.

[0075] The distribution chamber 44 is positioned on top of the second chamber 34 and is connected to the first chamber via a fluid flow path in the form of an S-shaped connecting conduit 46. (See later...) Figure 10 The connecting conduit 46 is described in more detail. The dispensing chamber 44 is connected to the dispensing outlet 18 via a conduit 48. The device 2 may have a predetermined maximum fill level aligned with a line 47 on the connecting conduit 46. The maximum fill level may be indicated by at least one mark on the inside of the reservoir 4 and / or the outside of the device. As shown, at least one bend in the connecting conduit 46 may be arranged above the maximum fill level 47.

[0076] Dispensing outlet 18 is mechanically coupled to valve member 40. In the illustrated embodiment, this mechanical coupling is achieved via a mechanical link 50, which connects to both dispensing outlet 18 and valve member 40. Thus, dispensing outlet 18 is coupled to valve member 40 such that movement of dispensing outlet 18 causes movement of valve member 40, thereby determining the state of mode valve 38. Although mechanical link 50 is shown, any suitable mechanical coupling can be used. For example, dispensing outlet 18 can be coupled to valve member 40 using multiple connecting lines adapted to pull valve member 40 into and out of its open and closed positions. A corrugated sealing member 52 seals the opening through which mechanical link 50 extends and also surrounds mechanical link 50 itself. This will be shown more clearly in later figures.

[0077] Figure 3A cross-sectional view of the components concentrated around the dispensing outlet 18 is shown. As shown in the figure, a sealing member 52 extends around the mechanical link 50. A first portion, namely a first end 49, of the sealing member 52 seals around an opening 54 in a wall 55, which at least partially defines a second chamber 34. The wall 55 also partially defines a recess in the device 2 in which the dispensing outlet 18 is disposed. Figure 3 As shown, the mechanical link 50 extends through the opening 54, which is larger than the extent of the mechanical link 50. Therefore, the larger opening 54 allows the mechanical link 50 to move freely vertically and laterally within the opening, thus allowing the mechanical link to move in a manner most suitable for controlling the valve assembly 40. A second portion, i.e., a second end, of the sealing member 52 seals around the mechanical link 50. The corrugated structure of the sealing member 52 allows the second end 51 to move relatively freely relative to the first, fixed end 49, thereby allowing the mechanical link 50 to move relatively freely while sealing the opening 54.

[0078] A fluid flow path is arranged between the first chamber 32 and the dispensing outlet 18. In the illustrated embodiment, this fluid flow path is via a connecting conduit 46 (e.g., Figure 2 (As shown) It enters the dispensing chamber 44 and exits through the dispensing chamber 64 into the conduit 48. The dispensing valve 56 is connected to the conduit 48 at one end 60 and to the attachment device 63 on the dispensing outlet 18 itself at the second end 62. In the illustrated embodiment, the dispensing valve 56 is in the form of a deformable conduit. The dispensing valve 56 in Figure 3 The figure shows the valve in the closed position. In the closed position, the dispensing valve 56 deforms to form a kink 58, such that in this closed configuration, liquid is prevented from flowing through the dispensing valve 56. The dispensing valve 56 can be formed of any suitable deformable material, such as silicone. The dispensing valve 56 forms part of the dispensing outlet 18, and when in the open position, liquid will be able to be dispensed from the dispensing outlet 18 through the second end 62 of the dispensing valve 56.

[0079] By moving the distribution outlet 18 to the non-distribution position shown, the distribution valve 56 can be driven into... Figure 3 The closed configuration is shown. As a result of installing the aforementioned dispensing valve 56, when the dispensing outlet 18 is pivoted into the appliance as shown, the dispensing valve 56 will deform and form a kink 58 due to its mounting point. Therefore, when the dispensing outlet 18 is moved to the closed position, the dispensing valve 56 adopts a closed configuration that prevents liquid from flowing through it. As previously stated, the connection between the dispensing valve 56 and the dispensing outlet 18 advantageously ensures that the dispensing valve 56 is closed when the dispensing outlet 18 is in the non-dispensing position.

[0080] Figure 3The closed configuration shown does not necessarily require the distribution valve 56 to be completely closed; instead, it may simply be equivalent to a modified state in which liquid flow is prohibited. For example, there may still be a small opening, but liquid is still prohibited from flowing through it due to the special shape of, for example, the kink portion 58.

[0081] The dispensing outlet 18, or indeed part of the appliance, may include additional means for deforming the dispensing valve 56. For example, a protrusion may be provided on the dispensing outlet 18, or on the housing in which the dispensing outlet 18 is recessed, which acts on the dispensing valve 56 to cause deformation. Such a protrusion can help ensure that the dispensing valve 56 correctly forms its closed arrangement.

[0082] While the deformable conduit-type distribution valve 56 has been shown and described above, any suitable distribution valve can be used. For example, the distribution valve may include an arrangement in which the orifice of the upstream portion of the valve is aligned with the orifice of the downstream portion of the valve when the distribution outlet is in the distribution position. This alignment allows fluid to flow through the distribution valve. When the distribution outlet is in the non-distribution position, the orifices of the upstream and downstream portions may be misaligned, for example, completely misaligned. This misalignment prevents fluid from flowing through the distribution valve. For example, the downstream portion may pivot relative to the upstream portion of the valve.

[0083] Figure 4 A separate distribution valve 56 is shown. The distribution valve 56 has at least a first part 66 and a second part 68. Figure 5A and Figure 5B Cross-sections of the dispensing valve 56 at the first portion 66 and the second portion 68 are shown. As shown, the cross-section in the first portion 66 has a different shape than the cross-section in the second portion 68. In the first portion 66, the cross-section is a circular rectangle, while in the second portion 68, the cross-section is circular. Furthermore, the wall thickness of the first portion is thinner than that of the second portion 68. Although in the illustrated embodiment, the region with the reduced wall thickness is aligned with the portions having different cross-sections, this is not mandatory, and they can be located on different portions / regions of the dispensing valve 56. Furthermore, the reduced wall thickness may only be present in portions of the cross-section, such as on the sides of the cross-section, and the other portions of the cross-section may have the same wall thickness.

[0084] Variations in wall thickness and cross-section can at least partially define where valve member 56 will kink when it bends due to movement of the dispensing outlet 18. The use of different wall thicknesses and cross-sections allows the dispensing valve 56 to reliably deform in the same location in a predictable manner, thereby ensuring a stable closing condition for the dispensing valve 56. Furthermore, by controlling the manner in which the dispensing valve 56 deforms, greater control can be gained over how it deforms over time, thus ensuring the lifespan of the dispensing valve 56.

[0085] Figure 6 A cross-sectional view focusing on the dispensing outlet 18 and its associated components is shown. The opening 54 through which the mechanical link 50 extends can be seen more clearly in this view. The sealing member 52 shown in the previous figure has been removed to show the mechanical link 50 and its features. As shown, the mechanical link 50 includes a groove 70 into which the second end 51 of the sealing member 52 engages. The groove 70 helps ensure that the sealing member 52 remains fixed to the mechanical link 50 even as it moves throughout its entire range of motion.

[0086] Dispensing outlet 18 and its associated components are contained within dispensing housing 71. Dispensing outlet 18 is pivotally mounted to dispensing housing 71 via pivot 74. An elastic member in the form of a spring 72 is arranged between the pivot and a mounting member 76 on the dispensing outlet 18 itself. Spring 72 is used to bias dispensing outlet 18 toward a dispensing position. Dispensing outlet 18 is held in the non-dispensing position by push-button 73, which must be released before spring 72 can move dispensing outlet 18 to the dispensing position. Push-button 73 can be released by pushing dispensing outlet 18 toward appliance 2, for example by pressing recess 20. With the release of push-button 73, spring 72 will drive dispensing outlet 18 into the dispensing position, as... Figure 12 As shown. The dispensing outlet 18 can be pushed back to the non-dispensing position, in which the push-button 73 can re-engage the dispensing outlet 18 and hold it in the non-dispensing position. The above description is only a typical embodiment of how the dispensing outlet 18 is arranged in the appliance 2, and any other suitable arrangement may be used.

[0087] As shown more clearly in this enlarged view of the distribution outlet 18, the kink 58 in the distribution valve 56 can form a ramp 78 over which liquid must rise and pass before it can leak through the distribution valve 56. The ramp 78 can be high enough to prevent unwanted liquid from flowing through the distribution valve 56 without having to completely close the distribution valve 56.

[0088] Figure 7 An internal view of appliance 2 is shown, with some components removed. Valve member 40 is in the form of a flap valve and is pivotally mounted to partition 36 via pivot 84. A float valve 82 is disposed at the center of partition 36. Float valve 82 includes a floating member arranged to engage with a valve seat when the first chamber 32 is filled with liquid. When the first chamber 32 is drained, the floating member falls into float valve 82, allowing liquid to drain from the second chamber 36 into the first chamber 32. Although when... Figure 7This is unnecessary when operating in the second mode shown, but when operating in the first mode, i.e., hot cup mode, float valve 82 allows refilling of the first chamber 32 without opening valve member 40. Float valve 82 can therefore allow multiple hot cup operations without the user having to repeatedly operate dispensing outlet 18 to allow liquid into the first chamber 32.

[0089] Outlet 80 is disposed in partition 36. Connecting conduit 46 (not shown) is connected to outlet 80 to allow heated liquid to enter distribution chamber 44 (not shown). Distribution housing 71 includes inlet 86, distribution valve 56 (not visible in this view) is connected to inlet 86 on one side, and conduit 48 (… Figure 3 (As shown in the figure) It is connected to inlet 86 on the side visible in the figure. This provides a fluid connection between distribution chamber 44 and distribution valve 56.

[0090] Figure 8 A more detailed view focusing on the first chamber 32 and the partition 36 is shown. Figure 8 In the view shown, valve member 40 has been removed to show the other components more clearly. Valve seat 42 defines an opening 88 in the partition 36, to which valve member 40 engages when in the closed position. When operating in the second operating mode, opening 88 allows fluid to flow between the first chamber 32 and the second chamber 34. Float valve 82 is supported at the center of opening 88 by a plurality of supports 90.

[0091] A pivot rod 92 is arranged on one side of the opening 88, on which the valve member 40 is pivotally mounted. A latching device 94 is provided at the opposite end of the opening 88. The latching device 94 is configured to hold the valve member 40 in the closed position when the appliance is operated in a hot cup operating mode, thereby holding the mode valve 38 in the closed state. The latching device includes a release member 96 and a latching member 97. The release member 96 and the latching member 97 are coupled together such that operation of the release member 96 causes the latching member 97 to be released, for example, retracted. The latching device 94 can be configured to be released by movement of the dispensing outlet 18 from a dispensing position to a non-dispensing position. For example, a mechanical linkage 50 (not visible in the figure) can act on the release member 96 to release the latching member 97, thereby allowing the valve member 40 to move into and out of the closed position.

[0092] As previously mentioned, the use of a latching device 84 that holds mode valve 38 in the closed position may mean that opening 88 can be larger than opening without latching device 84. The increased size of opening 88 can help facilitate fluid circulation between the two chambers 32, 34 in kettle operating mode, thereby enabling the kettle to operate in the most efficient manner.

[0093] Figure 9A separate valve member 40 is shown. The valve member 40 is annular and defines an opening 102 at its center. The annular shape does not need to be circular, but can have any suitable shape. The opening 102 at the center of the valve member 40 accommodates... Figure 8 The float valve 82 is shown. Valve member 40 includes a cylindrical sleeve 98 at one end, which allows valve member 40 to be pivotally mounted to... Figure 8 The pivot rod 90 is shown. A latch 100 and a linkage engagement device 101 are provided at the other end of the valve member 40. The latch 100 has a chamfered bottom end. This chamfer helps the latch 100 pass through the latch member 97 of the latching device 94 when the valve member 40 moves to its closed position. The linkage engagement device 101 provides a means for connecting a mechanical linkage 50, which is coupled to the dispensing outlet 18, to the valve member 40. The mode valve 38, including the flap valve 40 and the valve seat 42, can be referred to as a flap valve.

[0094] The annular valve member 40 has a U-shaped cross-section defining an outer wall 103 and an inner wall 105. Multiple support fins 104 are arranged between the outer wall 103 and the inner wall 105, increasing the stiffness of the annular valve member 40. Furthermore, a portion 106 of the outer wall 103 has an increased height compared to other portions of the valve member 40. Both the support fins 104 and the portion 106 with the increased wall height increase the stiffness of the valve member 40. This increased stiffness may be particularly important to ensure that the valve member 40 provides a sufficiently strong seal when in the closed position. The portions 106 with the increased height are equidistantly positioned between the latch 100 and the cylindrical sleeve 98. Therefore, these portions 106 are located at the maximum distance from any external support on the valve member 40, i.e., in the area where the valve member 40 would otherwise be most likely to deform and release the seal provided.

[0095] Figure 10 A separate S-shaped connecting conduit 46 is shown. The S-shape of the connecting conduit 46 defines a tortuous path. This tortuous path increases the fluid flow path between the first chamber 32 and the distribution chamber 44, and thus increases the resistance to fluid flow between these chambers 32, 44. When operating in kettle mode, as shown in the previous figure, although the pressure is lower due to the fluid's ability to enter the second chamber 34, there may be sufficient pressure in certain situations to drive some fluid flow to the distribution chamber 44. The increased flow resistance provided by the connecting conduit 46 prevents liquid from reaching the distribution chamber 44, which prevents any fluid from being accidentally distributed from the distribution outlet 18.

[0096] In the illustrated embodiment, the tortuous path of the connecting conduit 46 includes a first bend 108 and a second bend 110 defining an S-shaped bend. This S-shaped bend is particularly suitable for retaining fluid and preventing unwanted fluid from flowing through the connecting conduit 46 when the fluid pressure is relatively low. While an S-shaped bend is shown, any other form of bend capable of providing sufficient flow resistance can be provided. The segments of the connecting conduit 46 are supported by support fins 112 and held in place. Furthermore, the use of the S-shaped bend allows the connecting conduit 46 to connect the outlet 80 on the first chamber 32 to an off-center inlet on the dispensing chamber. At least one of the bends 108, i.e., its apex, can be positioned above the maximum fill level of the appliance, as shown by line 47.

[0097] Figure 11 A cross-section of the device 2 is shown, focusing particularly on the dispensing chamber 44 and the components disposed therein. As previously described, the dispensing chamber 44 includes an outlet 64, a first outlet from which liquid can flow to a dispensing outlet 18 (not shown). The dispensing chamber 44 also includes a discharge outlet 126, a second outlet, which, in certain circumstances, can be used to allow liquid to be discharged from the dispensing chamber 44 into a second chamber 34.

[0098] The “STOP” button 26 is connected to a valve element via a connector 122, which includes a shut-off valve member 124 and a drain valve member 128. During operation of the appliance 2, for example in the kettle mode as shown, the drain valve member 128 remains against the drain outlet 126. As a result, no liquid can be discharged from the dispensing chamber 44. Furthermore, the shut-off valve member 124 remains away from the outlet 64. However, when the appliance 2 is operated in the kettle mode as shown, there should still be very little or no liquid in the dispensing chamber 44, so no liquid should leak through the outlet 64. (See below for further details.) Figure 17 Describe the operation of the "STOP" button in more detail.

[0099] Appliance 2 includes a heating device in the form of a base plate heating device 118, which is arranged to heat the base of the first chamber 32. The base plate heating device 118 may be the only heating device in appliance 2. The base plate heating device 118 is electrically connected via a cable 116 to a thermomechanical switching device 114 arranged on top of the reservoir 4. The thermomechanical switching device 114 may include the applicant's popular R48 series vapor switches. The thermomechanical switching device 114 is coupled to an "ON" switch and is arranged to be sensitive to the temperature within appliance 2. The switching device 114 may be sensitive to the temperature in the second chamber 34 and the temperature in the dispensing chamber 44. When a predetermined temperature is reached, for example when the thermomechanical element arranged within the thermomechanical switching device 114 detects the predetermined temperature, the thermomechanical switching device 114 cuts off the power supply to the base plate heating device 118.

[0100] Thermomechanical switching device 114 is disposed above the second chamber 34. The distribution chamber 44 may include an opening (not visible in the figure) that allows steam to escape from the distribution chamber 44 and trigger the thermomechanical switching device 114 when the appliance is operating in the first operating mode. Furthermore, a baffle (not visible in the figure) may be coupled to the thermomechanical switching device 114, allowing selective closure of the opening in the distribution chamber 44. Therefore, when the thermomechanical switching device 114 cuts off the power to the base plate heating device 118, the baffle can close, preventing steam from escaping from the distribution chamber 44. This allows the thermomechanical switching device to reset more quickly when operating in the first operating mode.

[0101] The “STOP” button 26 is also connected to the thermomechanical switch 114 via the connector 120, so that operation of the “STOP” button 26 also operates the thermomechanical switch 114 to cut off the power supply to the heating appliance 118.

[0102] Now refer to Figures 1 to 11 The operation of appliance 2 in kettle mode is described. When dispensing outlet 18 is moved to the non-dispensing position, the mechanical connection provided by mechanical link 50 moves valve member 40 to the open position, causing mode valve 38 to open. Relative free movement of mechanical link 50 is permitted due to the corrugated structure of sealing member 52. When dispensing outlet 18 is in the non-dispensing position, dispensing valve 56 is also closed, preventing any liquid leakage through dispensing outlet 18. Of course, dispensing outlet 18 may already be in the non-dispensing position, for example, due to previous use of the appliance in kettle mode. Therefore, the mechanical connection between dispensing outlet 18 and mode valve 38 controls the operating mode of appliance 2.

[0103] The user can then press the "ON" button 22 to power on the heating device 118. The liquid contained in the reservoir 4, such as water, will then begin to heat. Specifically, the base plate heating device 118 will heat the liquid contained in the first chamber 32. As the liquid is heated in the first chamber 32, convection will occur, and the heated liquid will circulate through the opening 88 in the partition into the second chamber 34. Finally, once the liquid in the reservoir 4 reaches a predetermined temperature, the thermomechanical switching device 114 will be triggered, for example, due to sufficient steam forming in the reservoir 4, cutting off the power to the heating device 118. The reservoir 4 can then be lifted away from the power base 6, and the heated liquid can be dispensed through the container spout 12.

[0104] Because the connecting conduit 46 defines a tortuous path, heated liquid cannot flow into the dispensing chamber 44 in this kettle operating mode. Furthermore, since the dispensing valve 56 is closed during operation in this mode, no liquid can be dispensed through the dispensing outlet 18, even if any liquid is present in the dispensing chamber 44 or any interconnecting conduit.

[0105] Figures 12 to 17 The device 2 is shown operating in the first operating mode, namely the hot cup mode. Figure 12 The appliance 2 is shown configured in hot cup mode, with the dispensing outlet 18 moved to the dispensing position. As shown in the figure, the dispensing position in this embodiment corresponds to the dispensing outlet 18 protruding from the wall 19 of the appliance 2.

[0106] Figure 13 A cross-sectional view of appliance 2 operating in hot cup mode is shown. As the dispensing outlet 18 moves to the dispensing position shown, the mechanical linkage 50 actuates the mode valve 38 to close. In this position, the valve member 40 engages with and seals the valve seat 38. This closes the partition 36 separating the first chamber 32 and the second chamber 34, and thus closes the opening 88 (not visible in this figure). As a result, when liquid is heated in the first chamber 32, it cannot circulate through the mode valve 38 into the second chamber 34, but is instead forced under pressure through the connecting conduit 46.

[0107] Figure 14 A cross-sectional view of the device 2 is shown, focusing on the dispensing outlet 18. When the dispensing outlet 18 is moved to the dispensing position, the dispensing valve 56 moves to the open configuration, where liquid can pass through the dispensing valve and exit the dispensing outlet 18 via the second end 62. The liquid filling the dispensing chamber 44 can therefore be discharged from the outlet 64 through the conduit 48 and from the dispensing outlet 18 through the second end 62 of the dispensing valve 56. The figure also shows more clearly the collar 63 on the dispensing outlet 18, which holds the dispensing valve 56 in the position of the dispensing outlet 18. The figure also shows how the sealing member 52 with a corrugated structure engages with the groove 70 in the mechanical link 50. The second end 51 engages with the groove 70 on the mechanical link 50 and seals it around it. The dispensing outlet is secured to... Figure 1 The push button 73 in the unassigned position shown is displayed more clearly in this figure.

[0108] Figure 15A cross-sectional view focusing on the latching device 94 is shown. When the valve member 40 is in the closed position, the latching member 97 (not visible in this figure) locks onto the latch 100 on the valve member 40. The latching device 94 includes an elastic member in the form of a spring 130. The spring 130 is arranged to bias the latching member 97 into a latched position, i.e., to lock the latch 100 to hold the valve member 40 in the closed position. The mechanical link 50 includes an actuating portion 132 at its lower end. The actuating portion 132 includes a chamfered edge for engaging with the release member 96 of the latching device 94. When the mechanical link 50 is driven downward toward the latching device 94, the actuating portion 132 acts on the release member 96 to retract the latching member 97 against the bias of the spring 96, thereby allowing the valve member 40 to move to the closed position. Once in the closed position, the actuation portion 132 passes through the release member 96, and the spring 130 drives the latch member 97 to protrude from the latch assembly 94, thereby holding the valve member 40 in the closed position.

[0109] When the allocated outlet 18 moves back to the non-allocated position, that is, when it leaves... Figure 15 Enter the location shown. Figure 1 As shown, when the mechanical linkage 50 is raised, the actuating portion 132 acts on the release member 96. This causes the latch member 97 to retract and allows the mechanical linkage 50 and the linkage valve member 40 to move upward, thereby opening the mode valve 38. Once past the release member 96, the latch member 97 can move back to the protruding position under the bias of the spring 96.

[0110] Figure 16 The diagram shows a cross-sectional view of appliance 2 configured in hot cup operation mode, with valve member 40 in the closed position. In this configuration, during normal operation, the drain valve 126 is closed by drain valve member 128 because the shut-off valve member remains away from outlet 64, and outlet 64 is open. Therefore, when liquid reaches the dispensing chamber 44, it will freely discharge from the dispensing chamber 44 towards the dispensing outlet 18 via outlet 64.

[0111] Figure 17 A cross-sectional view of appliance 2 configured in hot cup mode is shown, with the "STOP" button 26 activated. (As previously mentioned...) Figure 11As described, the "OFF" button 26 is connected to the thermomechanical switching device 114 via connector 120 and also to valve members 124, 126 via connector 126. When the "STOP" button is actuated, valve member 124 is moved to close outlet 64, while drain valve member 128 is moved to open drain outlet 126. This allows any remaining liquid in dispensing chamber 44 to flow back to the second chamber 34 and also prevents any additional liquid from dispensing from dispensing chamber 44 to dispensing outlet 18 when outlet 64 is closed. Furthermore, connector 120 causes the switching device to cut off power to heating device 118, so that the liquid in the first chamber 32 is no longer heated.

[0112] The dispensing chamber 44 may also include a weir 134 over which liquid must pass during the dispensing operation to exit the dispensing chamber 44 or through the outlet 64. The weir 134 helps ensure that any liquid within the connecting conduit 46, such as any undispensed liquid remaining in its S-bends during a previous operation, mixes with the newly heated liquid. This helps ensure that the water dispensed from the dispensing chamber 44 does not contain any initially cold or underheated portions.

[0113] Now refer to Figures 12 to 17 The description describes the operation of appliance 2 in the first mode, i.e., the hot cup mode. When the dispensing outlet 18 moves to the dispensing position, as... Figure 12 As shown, the mechanical connection between the dispensing outlet 18 and the mode valve 38 via the mechanical link 50 causes the mode valve 38 to move to the closed position. When the dispensing outlet 18 moves to the dispensing position, the mechanical link releases the latching device 94, as detailed above, and drives the valve member 40 to engage with the valve seat 38, thereby placing the mode valve 38 in the closed configuration. When the valve member 40 moves into or reaches the closed position, the latching device 94 locks the valve member 40 and holds it in the closed position. Therefore, the mechanical connection between the dispensing outlet 18 and the mode valve 38 is conveniently used to control the operation of the device 2.

[0114] In addition to closing the mode valve 38, when the distribution outlet 18 moves out to the distribution position, the movement of the distribution outlet 18 can also move the distribution valve 56 to an open configuration, in which liquid can pass through the distribution valve 56 substantially unimpeded. This thus opens the distribution valve 56, allowing liquid to be distributed from the distribution outlet 18.

[0115] Therefore, when the dispensing outlet 18 is in the dispensing position, the mode valve 38 is closed and the dispensing valve 56 is open. When the "ON" button 22 is subsequently pressed, the liquid heating device 118 is powered on, and the liquid contained in the first chamber 32 is heated. As the temperature of the liquid increases, the pressure in the first chamber 32 increases, and the heated liquid is forced through the connecting conduit 46 under vapor pressure. The dimensions of the first chamber 32 can be determined, and the heating device 118 is configured such that a pressure sufficient to overcome the resistance of the tortuous flow path provided by the connecting conduit 46 can be achieved within the first chamber. Therefore, the heated liquid is forced through the connecting conduit 46 to the dispensing chamber 44.

[0116] Once inside the distribution chamber 44, the heated liquid can flow out of the distribution chamber through outlet 64, through conduit 48, and through the open distribution valve 56, thus exiting the distribution outlet 18. The heated liquid can fall into a container set on the drip tray 30. This process continues until the liquid in the first chamber 32 is sufficiently heated to trigger the thermomechanical switching device 114. The thermomechanical switching device 114 can be configured such that it does not disconnect the power supply to the heating device 118 before a predetermined volume of liquid has been distributed. This can be achieved by appropriately adjusting the predetermined operating temperature of the thermomechanical switching device 114. Triggering of the thermomechanical switching device 114 can be achieved by steam escaping from the distribution chamber 44 through an opening (not visible in the figure), thus allowing steam to pass through the thermomechanical switching device 114.

[0117] Without opening mode valve 38, the float valve 82, which allows refilling of the first chamber 32, facilitates repeated operation of the appliance 2 in hot cup mode. At the end of the dispensing operation in hot cup mode, when liquid has been discharged from the first chamber 32 and the pressure therein has decreased, the floating member in float valve 82 will descend, and liquid from the second chamber 34 will flow into the first chamber 32 through float valve 82. Once filled, the floating member in float valve 82 will close float valve 82 and prevent liquid from flowing from the second chamber 34 into the first chamber 32.

[0118] If a user decides midway through the hot cup dispensing process that they wish to stop, for example because their container is about to overflow, they can press the "STOP" button26. Figure 17As described in detail, pressing the "STOP" button 26 causes the connector 120 to act on the switching device 114 to cut off the power to the heating device 118, thereby stopping the heating of the liquid in the first chamber 32. This prevents any further liquid from flowing from the first chamber 32 to the distribution chamber 34. Furthermore, the connector 122 will move the drain valve member 128 away from the drain outlet 126 and move the valve member 124 to close the outlet 64. Therefore, after operating the "STOP" button 26, due to the closure of the outlet 64, liquid from the distribution chamber 44 can no longer be distributed through the distribution outlet 44, while liquid can be discharged into the second chamber 34 through the drain outlet. This thus prevents further distribution of liquid from the distribution outlet 18.

Claims

1. A liquid heating appliance, comprising: A reservoir comprising a first chamber disposed below a second chamber and separated by a partition extending between the two. A heating device, the heating device being arranged to heat a liquid contained in the first chamber during use; A mode valve, arranged in the partition to selectively allow liquid to flow between the first chamber and the second chamber, wherein the apparatus is arranged to operate in a first mode and a second mode, in the first mode, the mode valve is closed and only the liquid in the first chamber is heated, and in the second mode, the mode valve is open and both the liquid in the first chamber and the second chamber are heated by the heating device; A dispensing outlet is disposed on the outer wall of the appliance and movable between a dispensing position and a non-dispensing position, wherein in the dispensing position, the dispensing outlet is in fluid communication with the first chamber to allow liquid to be dispensed from the first chamber during a first mode, and in the non-dispensing position, liquid cannot be dispensed; wherein a fluid flow path is arranged between the first chamber and the dispensing outlet, wherein the flow path includes a dispensing valve configured to have at least an open configuration and a closed configuration, wherein in the open configuration, liquid can pass through the dispensing valve, and in the closed configuration, liquid flow is prohibited from passing through the dispensing valve; wherein the dispensing outlet is coupled to the dispensing valve such that when in the dispensing position, the dispensing valve has the open configuration, and when in the non-dispensing position, the dispensing valve has the closed configuration.

2. The liquid heating appliance according to claim 1, wherein, The distribution valve includes a deformable conduit in the flow path and is configured such that, in the closed configuration, the conduit deforms to prevent liquid from flowing through it.

3. The liquid heating appliance according to claim 2, wherein, The catheter includes a region with reduced wall thickness.

4. The liquid heating appliance according to claim 2 or 3, wherein, The conduit includes at least a first portion having a first cross-section and a second portion having a different second cross-section.

5. The liquid heating appliance according to claim 2 or 3, wherein the conduit is formed of silicone.

6. The liquid heating appliance according to any one of claims 1 to 3, further comprising a dispensing chamber arranged in a fluid flow path between the first chamber and the dispensing outlet, such that the liquid first passes through the dispensing chamber before flowing out of the dispensing outlet.

7. The liquid heating appliance of claim 6, further comprising a fluid connection conduit connecting the first chamber to the dispensing chamber, wherein the connection conduit follows a tortuous path.

8. The liquid heating appliance according to claim 7, wherein, The meandering path includes at least a first bend and a second bend arranged to define an S-shaped bend.

9. The liquid heating appliance of claim 8, wherein the liquid heating appliance has a predetermined maximum fill level, and wherein at least one bend in the tortuous flow path is arranged above the maximum fill level.

10. The liquid heating appliance according to any one of claims 1 to 3, wherein the dispensing outlet is mechanically coupled to the mode valve such that when the dispensing outlet moves to the dispensing position, the mechanical coupling closes the mode valve, and when the dispensing outlet moves to the non-dispensing position, the mechanical coupling opens the mode valve.

11. The liquid heating appliance of claim 10, wherein the mechanical connection includes a mechanical link extending through an opening in a wall that at least partially defines the second chamber, wherein the appliance further includes a sealing member extending around the mechanical link, wherein a first portion of the sealing member seals around the opening and a second portion of the sealing member seals to the mechanical link, and wherein the sealing member is configured such that the second portion of the sealing member is movable relative to the first portion of the sealing member.

12. The liquid heating appliance according to claim 11, wherein, The sealing member includes a corrugated structure configured to allow the second portion to move relative to the first portion.

13. The liquid heating appliance according to claim 11, wherein, The mechanical link includes a groove, into which the second portion of the sealing member engages.

14. The liquid heating appliance according to any one of claims 1 to 3, further comprising a latching device configured to hold the mode valve in a closed position.

15. The liquid heating appliance according to claim 14, wherein, The latching device is configured to be released when it moves from the dispensing position to the non-dispensing position via the dispensing outlet.

16. The liquid heating appliance of claim 10, further comprising a latching device configured to hold the mode valve in a closed position, wherein, The latching device is configured to be released via the mechanical connection.

17. The liquid heating appliance according to any one of claims 1 to 3, wherein, The mode valve includes a flap valve.

18. The liquid heating appliance according to claim 17, wherein, The flap valve includes a valve component that pivots at a pivot point and is arranged to engage with a corresponding valve seat in the partition to close the flap valve and prevent liquid from flowing through it.

19. The liquid heating appliance of claim 18, wherein the valve member is an annular valve member and has a U-shaped cross-section.

20. The liquid heating appliance according to claim 19, wherein, At least a portion of the wall of the annular valve member has an increased height compared to the other portions of the valve member.

21. The liquid heating appliance according to claim 19, wherein, The annular valve component includes multiple support fins arranged to increase the rigidity of the annular valve component.

22. The liquid heating appliance according to any one of claims 1 to 3, wherein, The heating device arranged to heat the liquid in the first chamber is the only heating device in the liquid heating appliance.

23. The liquid heating appliance according to any one of claims 1 to 3, wherein, The reservoir includes a spout arranged to allow liquid to be poured out of the appliance, and the mode valve is arranged in the partition substantially below the spout.

24. The liquid heating appliance according to any one of claims 1 to 3, comprising a thermomechanical element arranged to be sensitive to temperature within the appliance and arranged to cut off the power supply to the heating appliance when the thermomechanical element detects a predetermined temperature.

25. The liquid heating appliance according to any one of claims 1 to 3, comprising a base plate heating device arranged to heat the base of the first chamber.

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