Electromagnetic heater for waterpipe heating and waterpipe electromagnetic heating device

Abstract

The application discloses an electromagnetic heater for water pipe heating, comprising a shell and an electromagnetic heating body installed in the shell, wherein the shell comprises a heat insulation base, the electromagnetic heating body comprises an excitation coil and a driving circuit, the excitation coil is in a sheet shape and is gradually spiraled outward from a center by a wire, the excitation coil is directed towards the heat insulation base, and the driving circuit controls the excitation coil to emit a high-frequency alternating current signal to the outside of the heat insulation base, which can make an electromagnetic induction piece generate eddy current effect. The application also discloses a water pipe electromagnetic heating device. In the application, the excitation coil is separated from the electromagnetic induction piece, the electromagnetic induction piece is arranged at a tobacco bowl, the excitation coil is made into a sheet shape, high-frequency alternating current signals can be efficiently output to the electromagnetic induction pieces on opposite sides to make the electromagnetic induction pieces generate eddy current effect, the electromagnetic induction pieces generate heat to heat smoke generating substances in the tobacco bowl, and the heating efficiency is high and safe and reliable.

Description

Technical Field

[0001] This invention relates to hookah heating, and more particularly to hookah heating carbon for hookah heating. Background Technology

[0002] Arabian hookah originated in India and is mainly popular in Arab countries. (Reference) Figure 1 A hookah typically includes a bowl 11 for holding tobacco shreds 10 or tobacco paste, a bottle 12 for holding filtered water 121, and a pipe 122 located on the side wall of the bottle 12. The bottom of the bowl 11 has a ventilation pipe 111 connecting to the inside of the bowl 11, and a filter pipe 13 connects the ventilation pipe 111 and the filtered water 121 in the bottle 12. In use, first fill the bottle 12 with water, ensuring the filtered water 121 covers the filter pipe 13 by about one finger's width; the water level should not be too high. Place the bowl 11 on top of the bottle 12, inserting the ventilation pipe 111 of the bowl 11 into the filter pipe 13. A silicone sealing ring 14 is placed between the bowl 11 and the bottle 12. Next, place tobacco shreds 10 into the bowl 11, cover the entire bowl with a small piece of tin foil, poke some air holes in it, place the burning charcoal on the perforated tin foil, insert the smoking tube 15 into the pipe 122, and you can start smoking by picking up the mouthpiece at the end of the smoking tube 15. When smoking, the charcoal heats the tobacco shreds 10 in the bowl 11 through the tin foil, causing the tobacco to burn. When smoking from outside the smoking tube 15, air enters the bowl 11 through the air holes in the tin foil, passes through the tobacco shreds 10, passes through the filter tube 13 into the filtered water 121, and is then inhaled through the pipe 122 and the smoking tube 15.

[0003] However, this traditional hookah heating technology is not only complex to operate, but the uncontrollable charcoal temperature also results in insufficient smoke. Furthermore, the burning of charcoal during smoking produces harmful gases that are harmful to the human body when inhaled, and the open flame nature of the charcoal combustion poses a fire hazard. The resulting ash also pollutes the environment.

[0004] To address this, patent CN203952409U discloses an electrically heated hookah bowl, which has a heating metal tube directly installed at the bottom of the bowl. An eddy current coil is wound around the heating metal tube. During use, the eddy current coil directly heats the heating metal tube, causing it to char the tobacco. However, this electrically heated hookah bowl is difficult to clean after use. Over time, excessive charred tobacco residue accumulates at the bottom of the bowl, resulting in extremely low heating efficiency. Furthermore, since the heat source is at the bottom of the bowl, air is difficult to evenly enter the heating area, leading to insufficient uniform burning of the tobacco, especially during initial use, resulting in a poor smoking experience.

[0005] Chinese patent CN101483942A discloses an electronic hookah charcoal that uses a highly thermally conductive ceramic as a base to replace hookah charcoal. However, when using this electronic hookah charcoal, on the one hand, it blocks some of the pores on the tin foil, making it difficult for air to enter the hookah bowl, thus limiting the amount of smoke produced. When used by multiple smokers, the effect is often very poor. On the other hand, this electronic hookah charcoal can only heat the tin foil through its thermal conductivity, and then the tin foil heats the tobacco. If it is like existing hookah charcoal, the heating efficiency is poor. In fact, to increase the heating efficiency, a transformer with extremely high power and large size is often required for power supply.

[0006] Therefore, there is an urgent need for a water fume heating device that can solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide an electromagnetic heater and electromagnetic heating device for water pipe heating, which has high heating efficiency and is safe and reliable.

[0008] To achieve the above objectives, the present invention discloses an electromagnetic heater for heating water pipes, comprising a housing and an electromagnetic heating body installed within the housing. The housing includes a heat-insulating chassis, and the electromagnetic heating body includes an excitation coil and a driving circuit. The excitation coil is sheet-shaped and formed by a wire gradually spiraling outward around a center. The excitation coil faces the heat-insulating chassis, and the driving circuit controls the excitation coil to emit a high-frequency AC signal that can induce eddy currents in the electromagnetic induction element outside the heat-insulating chassis.

[0009] Preferably, the heat-insulating chassis is a ceramic disc or a mica component, which provides good heat insulation, does not interfere with the passage of high-frequency AC signals, and is low in cost. Of course, the heat-insulating chassis can also be made of other non-magnetic, non-metallic heat-insulating materials, and is not limited to ceramic discs.

[0010] Preferably, the heat-insulating base is provided with several supporting feet that support the housing. These supporting feet can support the top of the tobacco bowl and form an air inlet between the heat-insulating base and the tobacco bowl, communicating with the inside of the tobacco bowl. The electromagnetic sensor of this invention has multiple supporting feet at its bottom to support the housing of the electromagnetic sensor and form an air inlet between the electromagnetic sensor and the tobacco bowl, facilitating air entry into the tobacco bowl and allowing for proper combustion of smoke products, resulting in a better smoking experience. The heat-insulating base can be directly or indirectly supported on the tobacco bowl.

[0011] Specifically, the support feet are distributed around the center of the heat-insulating chassis, and a heating area corresponding to the position of the excitation coil is formed in the middle of the surrounding area of ​​the support feet.

[0012] Specifically, the support foot is located near the edge of the heat-insulating chassis, so that the support foot can be supported on the tobacco bowl.

[0013] Preferably, the heat-insulating chassis has an outwardly protruding boss in the middle, and the back of the outwardly protruding boss forms a recessed pit along the periphery inside the housing, and the excitation coil is installed in the recessed pit.

[0014] Specifically, the horizontal plane of the outer protrusion is lower than the end of the support foot. The support foot is located near the edge of the heat-insulating chassis and distributed around the center of the heat-insulating chassis. When the support foot is supported on the mouth of the tobacco bowl, the outer protrusion extends into the tobacco bowl.

[0015] More specifically, the outer protrusion has multiple engaging protrusions protruding outward from its periphery. The engaging protrusions are staggered with the support foot. The distance between the outer side of the engaging protrusion and the center of the heat insulation chassis is greater than or equal to the distance between the inner side of the support foot and the center of the heat insulation chassis, but less than the distance between the outer side of the support foot and the center of the heat insulation chassis. Furthermore, the outer end of the engaging protrusion is inclined to form a guide wall, which facilitates the outer protrusion extending into the bowl.

[0016] Preferably, the electromagnetic heater further includes a heat-resistant lid that can be placed on the tobacco bowl. The upper surface of the heat-resistant lid has a recessed cavity at a position that matches the mouth of the tobacco bowl. A through hole is formed on the bottom wall of the cavity. The heat-insulating base has an external protrusion in the middle that mates with the cavity. The housing is movably mounted on the heat-resistant lid. The external protrusion extends into the cavity, forming an air inlet between the heat-resistant lid and the heat-insulating base, which communicates with the outside. The air inlet is connected to the through hole.

[0017] Preferably, the electromagnetic heating body further includes a control unit and a power supply unit, the power supply unit supplies power to the drive circuit, and the control unit controls the operation of the drive circuit.

[0018] Specifically, the housing includes a top shell, a bottom shell, and an isolation cover installed between the top shell and the bottom shell. A first chamber for installing the control unit and the power supply unit is formed between the top shell and the isolation cover. A second chamber for installing the excitation coil is formed between the isolation cover and the bottom shell. The isolation cover isolates the first chamber and the second chamber. The heat-insulating chassis forms the bottom wall of the bottom shell. The isolation cover effectively isolates the control power supply part and the electromagnetic generation part (excitation coil) of the electromagnetic heating body, preventing heat and electromagnetic interference between the control power supply part and the electromagnetic generation part (excitation coil).

[0019] Specifically, the middle of the isolation cover is recessed into the second chamber to form an isolation cavity, which is different from the first chamber. The side of the isolation cover opposite to the isolation cavity forms an outwardly protruding inner boss, and the excitation coil is installed between the inner boss and the heat insulation chassis.

[0020] Specifically, the excitation coil is mounted on the inner boss and has a gap between it and the heat-insulating chassis.

[0021] Specifically, the bottom shell includes an annular fixing frame and a heat-insulating chassis that engages with the annular fixing frame.

[0022] Preferably, a handle is formed on the outside of the housing.

[0023] Preferably, an electromagnetic shielding plate is provided on the side of the excitation coil away from the heat-insulating chassis, and the excitation coil is mounted on the electromagnetic shielding plate. The electromagnetic shielding plate can effectively prevent the electromagnetic field of the excitation coil from affecting the control power supply section of the first chamber.

[0024] Preferably, the electromagnetic shielding sheet has a radial hole that extends from the edge to the center, and the excitation coil gradually spirals inward from the edge to the center along its first end, and then leads out the second end of the excitation coil along the radial hole.

[0025] Preferably, the cross-sectional length of the conductor of the excitation coil is longer in the radial direction than the length along the center line of the excitation coil, which saves energy, has high heating efficiency, and facilitates the formation of eddy current induction in the electromagnetic induction element.

[0026] The present invention also discloses an electromagnetic heating device for hookah, including an electromagnetic heater and an electromagnetic induction element. The electromagnetic induction element is installed at the hookah bowl. The electromagnetic heater, as described above, is installed above the hookah bowl with the heat-insulating base facing the opening of the hookah bowl. The excitation coil of the electromagnetic heater emits a high-frequency AC signal to cause the electromagnetic induction element at the hookah bowl to generate an eddy current effect.

[0027] Preferably, the electromagnetic induction element is tin foil wrapped around the mouth of the tobacco bowl, a metal sheet installed on the mouth of the tobacco bowl, or an electromagnetic induction sheet placed inside the tobacco bowl. The tin foil or metal sheet has several ventilation holes. The electromagnetic induction element heats the smoke generator in the tobacco bowl to produce smoke.

[0028] Preferably, the electromagnetic induction element is mounted on the rim of the tobacco bowl, and a smoke-collecting groove is formed thereon. The smoke-collecting groove is used to collect the smoke-generating material. The electromagnetic induction element heats the smoke-generating material in the smoke-collecting groove. The bottom of the smoke-collecting groove has a vent hole communicating with the inside of the tobacco bowl. After air enters the smoke-collecting groove to assist combustion and generate smoke, the generated smoke passes through the vent hole into the tobacco bowl, and then enters the tobacco bottle of the hookah through the vent pipe inside the tobacco bowl. This design eliminates the need to place the smoke-generating material inside the tobacco bowl; it can be placed on the electromagnetic induction element, making heating convenient and highly efficient.

[0029] Compared with existing technologies, this invention discloses an electromagnetic heater for heating smoke-generating materials (tobacco, tobacco paste, etc.). In use, a traditional method can be employed: wrapping tin foil around a tobacco bowl to act as an electromagnetic induction element. Alternatively, an electromagnetic induction element that can contact the smoke-generating material can be placed inside or on the tobacco bowl. The electromagnetic heater is then placed directly on the tobacco bowl. The excitation coil in the electromagnetic heater induces an eddy current effect in the electromagnetic induction element, causing it to heat up and ignite the smoke-generating material. Firstly, this invention uses an electromagnetic induction device to heat the electromagnetic induction element, resulting in high heating efficiency and low power requirements for the power supply. Secondly, the excitation coil of this invention is sheet-shaped and formed by wires spiraling outwards from a center. This allows the electromagnetic induction element on the outside of the heat-insulated chassis to directly heat up and ignite the smoke-generating material under the eddy current effect, eliminating the need for heat conduction from other components and further increasing the heating efficiency of the smoke-generating material. Thirdly, the electromagnetic induction element of this invention only receives high-frequency electromagnetic signals from the electromagnetic heater for heating. The electromagnetic induction element itself is not electrically connected to any circuit, significantly improving the stability and reliability of the system. Attached Figure Description

[0030] Figure 1 This is a structural diagram of a traditional hookah.

[0031] Figure 2 This is a perspective view of the electromagnetic heater of the present invention.

[0032] Figure 3 This is a top view of the electromagnetic heater of the present invention.

[0033] Figure 4 This is an exploded perspective view of the electromagnetic heater of the present invention.

[0034] Figure 5 This is a structural diagram of the installation of the excitation coil and electromagnetic shielding sheet of the present invention.

[0035] Figure 6 This is a structural diagram of the excitation coil and electromagnetic shielding sheet of the present invention installed from another angle.

[0036] Figure 7a This is a structural block diagram of the electromagnetic heater of the present invention.

[0037] Figure 7b This is a structural diagram of the driving circuit in one embodiment of the present invention.

[0038] Figure 7c This is a structural diagram of the driving circuit in another embodiment of the present invention.

[0039] Figure 7d This is a structural diagram of the driving circuit in another embodiment of the present invention.

[0040] Figure 7eThis is the main circuit diagram of the water fume electromagnetic heating device of the present invention.

[0041] Figure 8 This is a structural diagram of the water fume electromagnetic heating device installed on the water fume in the first embodiment of the present invention.

[0042] Figure 9 This is a side view of the water fume electromagnetic heating device in the first embodiment of the present invention.

[0043] Figure 10 This is a structural diagram of the electromagnetic induction element in the first embodiment of the present invention.

[0044] Figure 11 This is a structural diagram of the water fume electromagnetic heating device installed on the water fume in the second embodiment of the present invention.

[0045] Figure 12 This is a structural diagram of the water fume electromagnetic heating device installed on the water fume in the third embodiment of the present invention.

[0046] Figure 13 This is a structural diagram of the water fume electromagnetic heating device installed on the water fume in another embodiment, which is different from the first embodiment of the present invention.

[0047] Figure 14 This is a structural diagram of the water fume electromagnetic heating device installed on the water fume in the second embodiment of the present invention.

[0048] Figure 15 This is a structural diagram of the water fume electromagnetic heating device installed on the water fume in the third embodiment of the present invention. Detailed Implementation

[0049] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0050] refer to Figure 8 and Figure 9 This invention discloses an electromagnetic heating device for hookah, including an electromagnetic heater 200 and an electromagnetic induction element 40. The electromagnetic induction element 40 is installed on the hookah bowl 11 and can contact the smoke generator 10 (tobacco or tobacco paste) inside the bowl 11. The electromagnetic heater 200 has an excitation coil 31 and a driving circuit 32. The driving circuit 32 can drive the excitation coil 31 to emit a high-frequency AC signal to cause the electromagnetic induction element 40 to generate an eddy current effect.

[0051] refer to Figures 2 to 4The electromagnetic heater 200 includes a housing 20 and an electromagnetic heating body 30 installed within the housing 20. The housing 20 includes a heat-insulating chassis 21. The electromagnetic heating body 30 includes an excitation coil 31 and a driving circuit 32. The excitation coil 31 is sheet-shaped and formed by a conductor 311 gradually spiraling outward around a center. The excitation coil 31 faces the heat-insulating chassis 21. The driving circuit 32 controls the excitation coil 31 to emit a high-frequency AC signal to the outside of the heat-insulating chassis 21, which can induce eddy currents in the electromagnetic induction element 40. The excitation coil 31 is formed by the conductor 31 spiraling in a plane.

[0052] In this embodiment, the electromagnetic induction element 40 is movably mounted on the bowl 11 of the hookah and can contact the smoke generator 10 (tobacco or tobacco paste) inside the bowl 11. The electromagnetic heater 200 is movably mounted on the electromagnetic induction element 40, and the electromagnetic induction element 40 has a through-hole vent 41 at the rim of the bowl 11, which can emit a high-frequency AC signal to the electromagnetic induction element 40 to generate an eddy current effect. The electromagnetic heater 200 has an excitation coil 31 and a drive circuit 32. The drive circuit 32 can drive the excitation coil 31 to emit a high-frequency AC signal to generate an eddy current effect in the electromagnetic induction element 40. The movable mounting of this invention is a mounting structure that allows for slight horizontal movement (non-clamping) and free lifting vertically (parallel to the center of the bowl). When the electromagnetic induction element 40 is lifted, it will not move the bowl 11; it can be lifted directly.

[0053] refer to Figure 9 When the electromagnetic inductor 200 is movably mounted on the electromagnetic inductor 40, an air inlet 210 communicating with the outside is provided between the electromagnetic heater 200 and the electromagnetic inductor 40. The air inlet 210 is also connected to the vent 41. The heat-insulating base 21 has several supporting feet 211 protruding from it, which can support the bowl 11 and form an air inlet 210 communicating with the bowl 11 between the heat-insulating base 21 and the bowl 11. The supporting feet 211 can be located at the edge of the heat-insulating base 21 or in the middle of the heat-insulating base 21, as long as the heat-insulating base 21 is suspended on the bowl. The electromagnetic inductor 40 is a metal sheet mounted on the rim of the bowl 11.

[0054] refer to Figure 1 and Figure 8There is a gap between the electromagnetic induction element 40 and the ventilation tube 111 in the bowl 11. When smoking, the drive circuit 32 can drive the excitation coil 31 to emit a high-frequency AC signal to cause the electromagnetic induction element 40 to generate an eddy current effect, so that the electromagnetic induction element 40 heats the smoke generator 10, and the smoke generator 10 produces smoke. When a person inhales through the smoking tube 15, air enters the ventilation hole 41 from the air inlet 210, enters the bowl 11 from the ventilation hole 41, and the smoke generated in the bowl 11 enters the filter tube 13 through the ventilation tube 111. After being filtered in the filtered water 121 through the filter tube 13, it passes through the smoking tube 122 and is inhaled by the person.

[0055] refer to Figure 8 and Figure 10 In this embodiment, the electromagnetic induction element 40 mounted on the tobacco bowl 11 includes a periphery 42 and a central heating part 43 recessed downwards. The periphery 42 is supported on the edge of the rim of the tobacco bowl 11 and seals the rim to prevent smoke from overflowing. The lower surface of the central heating part 43 is recessed into the tobacco bowl 11 and, together with the periphery 42, forms a lid covering the tobacco bowl 11. In this embodiment, the heating part 43 is a circular groove. Of course, the heating part 43 can also be a square groove or other grooves.

[0056] refer to Figure 13 In another embodiment, the heating part 43a can also be an annular groove. In this case, the heating part can extend below the top of the vent pipe 111 of the bowl, or it can only extend above the vent pipe 111.

[0057] In the above embodiments, the heating element 40 can be a single piece, with its peripheral and central portions being made of the same material as the heating part 43a. In another embodiment, the heating element 40 can also be a fitted piece, with its central portion made of a different material from the heating part 43a. The central portion opposite to the vent pipe 111 is made of a non-magnetic and heat-resistant material, such as ceramic.

[0058] The electromagnetic induction element 40 also includes an operating handle 44 extending outward from the periphery 42. The user can use a clip to grab the operating handle 44 to remove the electromagnetic induction element 40 from the bowl 11 after use. The operating handle 44 has a hanging hole 441, through which the user can hang the electromagnetic induction element 40 on a hook for storage.

[0059] In this embodiment, the electromagnetic induction element 40 is stamped from a metal sheet (such as tinplate, stainless steel, or stainless iron), or it can be other electromagnetically inductive materials or materials mixed with metallic substances.

[0060] refer to Figure 8The heat-insulating base 54 and the heating part 43 of the electromagnetic induction element 40 are spaced apart to form a heating cavity 400. One end of the heating cavity 400 is connected to the air inlet 210 and the other end is connected to the vent 41. When smoking, external air enters the heating cavity 210 through the air inlet 41, is heated by the electromagnetic induction element 40 in the heating cavity 210, and then enters the bowl 11 through the vent 41. When the electromagnetic heater 200 is placed on the electromagnetic induction element 40 and the switch is turned on, the electromagnetic induction element 40 generates eddy currents and heats up. If no one is smoking, the air remaining in the heating cavity 400 will be heated by the electromagnetic induction element 40, making the air outside the electromagnetic induction element hot air. This ensures that the air entering the smoke generator 10 is warm air when smoking, resulting in a better smoking experience. It also ensures that the temperature inside the bowl is high and stable, with minimal temperature fluctuation of the electromagnetic induction element 40, and stable combustion of the smoke generator 10.

[0061] In one embodiment, in order to better cover the bowl 11, the electromagnetic induction element 40 has a downwardly bent edge on its periphery 42 to wrap around the periphery of the bowl 11, and the operating handle 44 is formed at the end of the downwardly bent edge.

[0062] refer to Figure 2 and Figure 3 The support feet 211 are distributed around the center of the heat-insulating chassis 21, and a heating area corresponding to the position of the excitation coil 31 is formed in the middle of the surrounding area. Specifically, the support feet 211 are located near the edge of the heat-insulating chassis 21.

[0063] refer to Figure 2 , Figure 3 and Figure 8 The heat-insulating chassis 21 has an outward protrusion 212 in the middle, and the back of the outward protrusion 212 forms a recessed pit on the periphery inside the housing 20. The excitation coil 31 is installed in the recess.

[0064] Specifically, the horizontal plane of the outer protrusion 212 is lower than the end of the support foot 211. The support foot 211 is located near the edge of the heat insulation base 21 and distributed around the center of the heat insulation base 21. When the support foot 211 is supported on the mouth of the bowl 11, the outer protrusion 212 extends into the bowl 11.

[0065] In this embodiment, the support foot 211 is supported on the periphery 42 of the electromagnetic induction element 40, and the outer boss 212 extends into the recess of the central heating part 43 and engages with the heating part 43 of the electromagnetic induction element 40. The radius of the outer boss 212 is smaller than that of the heating part 43, and the distance from the outer boss 212 to the end of the support foot 211 is smaller than the depth of the heating part 43.

[0066] refer to Figure 2 and Figure 3 The outer protrusion 212 has multiple guide protrusions 213 protruding outwards along its periphery. These guide protrusions 213 are staggered with the support foot 211. The distance between the outer side of the guide protrusion 213 and the center of the heat-insulating base 21 is greater than or equal to the distance between the inner side of the support foot 211 and the center of the heat-insulating base 21, but less than the distance between the outer side of the support foot 211 and the center of the heat-insulating base 21. The outer end of the guide protrusion 213 is inclined to form a guide wall (e.g., ...). Figure 2 As shown, the guide wall is used to guide the outer boss 212 into the recess of the heating part 43.

[0067] The guide channels are formed between adjacent guide protrusions 213, specifically extending longitudinally along the centerline of the smoke container 11. The heating chamber 400 is formed between the outer protrusion 212 and the heating part 43. Multiple guide channels are provided and located above and outside the heating chamber 400. This design requires air to descend from the air inlet for a period of time before horizontally entering the heating chamber 400. The air inlet 210 is located above and outside the heating chamber 400, and the guide channels extend from top to bottom. In this embodiment, the guide channels are longitudinal channels from top to bottom and do not extend axially along the outer protrusion 212. In another embodiment, the guide channels can also be spiral channels coiled outside the outer protrusion.

[0068] In this embodiment, the bottom of the heating part 43 of the electromagnetic induction element 40 is a flat plate parallel to the inlet of the smoke container 11, and the bottom shell 21 is flat relative to the heating part 43, so that the heating cavity 400 is flat. Of course, the bottom of the heating part 42 of the electromagnetic induction element 40 can also be conical, downwardly inclined triangle, cone, sphere, etc., and is not limited to a plate shape.

[0069] Preferably, the electromagnetic heating body 30 further includes a control unit 33 and a power supply unit, the power supply unit supplies power to the drive circuit 32, and the control unit 33 controls the operation of the drive circuit 32.

[0070] refer to Figure 7a This is a circuit block diagram of the electromagnetic heating body 30 of the present invention. The power supply unit includes a storage battery 341, a charging management unit 342, a power management unit 343, and a DC interface 345. The DC interface 345 is connected to the storage battery 341 through the charging management unit 342. The charging management unit 342 manages the charging and discharging of the storage battery 341, and the power management unit 342 converts the electrical energy in the storage battery into a corresponding voltage and supplies it to the drive circuit 32 to power the drive circuit 32.

[0071] The power supply unit also includes an auxiliary power supply 344, which is connected to the power management unit 342 through the power supply interface 347. The auxiliary power supply 344 converts the external mains power into a power supply voltage and sends it to the power management unit 342. The power management unit 342 converts the power supply voltage into a corresponding voltage and sends it to the drive circuit 32 to power the drive circuit 32.

[0072] The DC interface 345 is also connected to a power management unit 343, which converts the electrical energy input from the DC interface 345 into a corresponding voltage and supplies it to the drive circuit 32 to power the drive circuit 32. The DC interface 345 can be a DC power interface such as a USB interface, microUSB, or Type-C. In this embodiment, the battery 341 is a lithium battery.

[0073] In this embodiment, three power input methods are provided: auxiliary power supply, DC interface power supply, and battery power supply. The control unit 33 is connected to the power management unit 342 and controls the power management unit 342 to select the power input method according to priority, from highest to lowest: auxiliary power supply, DC interface power supply, and battery power supply. The power management unit 342 designs different topologies based on different input voltages, such as pass-through mode, boost mode, buck mode, and buck-boost mode.

[0074] refer to Figure 7e This is a circuit diagram of the electromagnetic heating body 30, including three power inputs provided by the power supply unit: auxiliary power supply V... DC DC interface power supply V USB and storage battery power supply V BAT The power management unit 342 converts electrical energy input from different power input methods into the voltage required by the drive circuit 32. Under the control of the control unit 33, the drive circuit 32 controls the LC network to output a corresponding high-frequency AC signal. The LC network includes a resonant capacitor and a resonant inductor (excitation coil 31) connected in series. The LC network sends the high-frequency AC signal to the electromagnetic induction element 40. The electromagnetic induction element 40 receives the high-frequency AC signal to generate eddy current effect, thereby generating heat. The electromagnetic heating body 30 also has a voltage detection circuit 331 and a current detection circuit 332, which respectively collect the voltage across the LC network and the current on the excitation coil 31, and transmit the detected voltage and current to the control unit 33.

[0075] When a high-frequency AC signal is sent to the electromagnetic induction element 40, an induced current is generated on the electromagnetic induction element 40. Since the resistivity of the electromagnetic induction element 40 changes with temperature, within the normal temperature range, the resistivity of the electromagnetic induction element 40 changes linearly with temperature. This relationship can be expressed as: ρ = ρ0(1 + αt), where ρ and ρ0 are the resistivity at the current temperature t℃ and 0℃, respectively; α is the temperature coefficient of the resistivity of the electromagnetic induction element 40, and t is the temperature value of the electromagnetic induction element. Therefore, the change in resistance of the electromagnetic induction element 40 has a linear relationship with the change in temperature. That is: t = (R - R0) / (R0 * α), where R and R0 are the resistance values ​​at the current temperature t℃ and 0℃, respectively, and α is the temperature coefficient of the resistivity of the electromagnetic induction element 40. According to the formula, when the temperature rises, the resistance of the electromagnetic induction element 40 will also increase; consequently, the current in the LC network loop will decrease, and the power fed back to the drive circuit 32 will also decrease. In other words, the power in the drive loop of the LC network will also decrease. The power of the drive circuit and the temperature of the electromagnetic induction element 40 are linearly related. According to the power calculation formula P=UI, the temperature of the electromagnetic induction element 40 can be calculated simply by calculating the power of the drive circuit. The memory of the control unit 33 stores the current, voltage, power, power-temperature coefficient, and set temperature of the drive circuit corresponding to temperature control. When the entire system starts working, the control unit 33 acquires the current and voltage in the drive circuit detected by the voltage detection circuit 331 and the current detection circuit 332 in real time. Based on the current and voltage, it calculates the power of the drive circuit and the temperature of the electromagnetic induction element 40 according to the power-temperature coefficient. The set temperature and the temperature of the electromagnetic induction element 40 are compared. When the temperature of the electromagnetic induction element 40 is greater than the set value, the control unit 33 controls the drive circuit 32 to stop outputting control signals to the LC network, and the electromagnetic induction element 40 stops heating. When the temperature of the electromagnetic induction element 40 is less than the set value, the drive circuit 32 continues to output control signals to the LC network, and the electromagnetic induction element 40 continues heating, thus achieving temperature control.

[0076] Ideally, during the temperature control process, the temperature of the detected electromagnetic induction element 40 is integrated in real time, and the upper and lower limits of the temperature integration are predetermined. When the temperature integration rapidly exceeds the upper limit, smoking is detected, and the number of puffs is counted.

[0077] The control unit 33 includes an MCU, a switch button 333, and a detection circuit. Pressing the switch button 333 inputs a start command, and the MCU operates according to the start command to control the drive circuit 32. The MCU also uses the detection circuit to detect the presence of an electromagnetic induction device. If no device is detected, it enters standby mode and detects at a preset frequency. When an electromagnetic induction device is detected, it enters the operating mode. The detection circuit includes a voltage detection circuit 331 and a current detection circuit 332. The MCU can determine the presence of the electromagnetic induction device by collecting the voltage and current from the voltage and current detection circuits 331 and 332. The MCU, switch button 333, detection circuit, and drive circuit 32 are all mounted on circuit board 26.

[0078] refer to Figure 7b In one embodiment, the driving circuit 32 is a full-bridge driving circuit, which can greatly improve working efficiency and save energy.

[0079] The driving circuit 32 consists of MOSFETs Q1, Q2, Q3, and Q4, and together with the LC network, forms the main circuit of the high-frequency signal generation circuit. The LC network consists of a resonant capacitor C1 and a resonant inductor L1. The resonant inductor L1 is the equivalent inductance of the excitation coil 31, and R is the equivalent resistance of the electromagnetic induction element, used to receive the high-frequency AC signal transmitted by inductor L1, thereby generating heat. The LC network is a series resonant network with a resonant frequency of: When the control unit 33 controls the drive circuit 32 to operate such that the frequency of the drive signal f = f0, the circuit will resonate. The timing sequence during operation is as follows: during the positive half-cycle of the signal, the current flows from VCC → Q1 → C1 → L1 → Q4 → GND; during the negative half-cycle of the signal, the current flows from VCC → Q2 → L1 → C1 → Q3 → GND.

[0080] refer to Figure 7c In another embodiment, the driving circuit 32 can be a half-bridge driving circuit.

[0081] The driving circuit 32 consists of MOSFETs Q5 and Q6, forming the main circuit of the high-frequency signal generation circuit with the LC network. The LC network consists of resonant capacitor C1 and resonant inductor L1. The resonant inductor L1 is the equivalent inductance of the excitation coil 31, and R is the equivalent resistance of the electromagnetic induction element, used to receive the high-frequency AC signal transmitted by inductor L1, thereby generating heat. The LC network is a series resonant network with a resonant frequency of: When the control unit 33 controls the drive circuit 32 to operate such that the frequency of the drive signal f = f0, the circuit will resonate. The operating timing is as follows: during the positive half-cycle of the signal, the current flows from VCC → Q1 → C1 → L1 → GND; during the negative half-cycle of the signal, the current flows from L1 → C1 → L1 → Q2 → GND.

[0082] refer to Figure 7d In another embodiment, the driving circuit 32 is a Class E amplifier circuit.

[0083] The driving circuit consists of a MOSFET Q7, capacitor C2, and a high-frequency choke L0, forming the main circuit of the high-frequency signal generation circuit together with the LC network. The LC network consists of a resonant capacitor C1 and a resonant inductor L1. The resonant inductor L1 is the equivalent inductance of the excitation coil 31, and R is the equivalent resistance of the electromagnetic induction element, used to receive the high-frequency AC signal transmitted by inductor L1, thereby generating heat. The LC network is a series resonant network with a resonant frequency of: When the control unit 33 controls the drive circuit 32 to operate such that the frequency of the drive signal f = f0, the circuit will resonate.

[0084] refer to Figure 4 and Figure 8 The housing 20 includes a top shell 22, a bottom shell 23, and an isolation cover 24 installed between the top shell 22 and the bottom shell 23. A first chamber 201 for mounting the control unit 33 and the power supply unit is formed between the top shell 22 and the isolation cover 24. A second chamber 202 for mounting the excitation coil 31 is formed between the isolation cover 24 and the bottom shell 23. The isolation cover 24 isolates the first chamber 201 and the second chamber 202. The heat-insulating chassis 21 forms the bottom wall of the bottom shell 23. The isolation cover 24 can effectively isolate the control power supply part and the electromagnetic generation part (excitation coil 31) of the electromagnetic heating body 30, reducing the heat and electromagnetic influence between the control power supply part and the electromagnetic generation part (excitation coil 31).

[0085] refer to Figure 4 and Figure 8 The middle of the isolation cover 24 is recessed into the second chamber 202 to form an isolation cavity 203. The isolation cavity 203 is different from the first chamber 201. The side of the isolation cover 24 facing away from the isolation cavity 203 forms an outwardly protruding inner boss 241. The excitation coil 31 is installed between the inner boss 241 and the heat insulation chassis 21.

[0086] refer to Figure 8 The excitation coil 31 is mounted on the inner boss 241 and has a gap between it and the heat insulation chassis 21.

[0087] In this embodiment, the edge of the isolation cover 24 has several mounting positions. The isolation cover 24 is mounted on the top shell 22 through the mounting positions. There are mutually cooperating mounting components between the top shell 22 and the bottom shell 23. The top shell 22 and the bottom shell 23 are mounted together through the mounting components. When the housing 20 is assembled, the control unit 33 and the power supply unit are first installed in the top shell 22, then the isolation cover 24 is installed on the top shell 22 to close the first chamber 201, then the excitation coil 31 is installed on the inner boss 241 of the isolation cover 24, and then the bottom shell 23 is installed on the top shell 22 to close the second chamber 202.

[0088] refer to Figure 4 and Figure 8 The bottom shell 23 includes an annular fixing frame 230 and a heat-insulating chassis 21 that engages with the annular fixing frame 230. (Reference) Figure 4 The heat-insulating base 21 is a ceramic disc. Of course, the heat-insulating base 21 can also be made of other non-magnetic, non-metallic heat-insulating materials, not limited to ceramic discs, for example, it can be a mica component.

[0089] In this embodiment, the heat-insulating chassis 21 is made of the same material as a single piece. In one embodiment, the support foot 211 of the heat-insulating chassis 21, which is in contact with the electromagnetic induction element 40, is made of a high-temperature resistant material. Other materials that are not in contact with the electromagnetic induction element 40 have lower requirements for high-temperature resistance.

[0090] refer to Figures 2 to 4 The outer surface of the housing 20 is provided with a handle 25 for gripping.

[0091] refer to Figure 5 and Figure 8 An electromagnetic shielding plate 35 is provided on the side of the excitation coil 31 away from the heat-insulating chassis 21, and the excitation coil 31 is mounted on the electromagnetic shielding plate 35. The electromagnetic shielding plate can effectively prevent the electromagnetic field of the excitation coil 31 from affecting the control power supply part of the first chamber 201. The electromagnetic shielding plate can be made of a high permeability material to shield against eddy current phenomena generated by metal parts in other directions.

[0092] refer to Figure 5 and Figure 6 The electromagnetic shielding sheet 35 has a radius hole 351 that extends from the edge to the center. The excitation coil 31 gradually spirals inward from the edge to the center along its first end and then leads out the second end of the excitation coil 31 along the radius hole 351.

[0093] refer to Figure 5 and Figure 6 The cross-sectional length of the conductor 311 of the excitation coil 31 in the radial direction (length in the width direction) is greater than the length in the center line direction (length in the thickness direction), and the surface where the thickness of the conductor 311 is located is opposite to the heat insulation chassis 21.

[0094] For the better option, refer to Figure 5 and Figure 6 The conductor 311 of the excitation coil 31 is flat (the cross-section can be rectangular, elliptical, etc.), and its flat surface is opposite to the heat-insulating chassis 21. Of course, the cross-section of the conductor 311 of the excitation coil 31 can also be triangular or trapezoidal. The conductor 311 of the excitation coil 31 can be composed of a single conductor wrapped with an insulating layer, or it can be composed of multiple conductors wrapped with insulating layers.

[0095] In the above embodiment, the heat insulation base 21 of the electromagnetic heater 200 is indirectly mounted on the chimney 11 through the electromagnetic induction element 40. The heat insulation base 21 and the electromagnetic induction element 40 have a concave-convex fit structure that limits the radial movement, preventing the heat insulation base 21 from sliding radially out of the electromagnetic induction element 40.

[0096] Of course, in other embodiments, the cross-section of the excitation coil 31 can also be circular or square.

[0097] In the above embodiment, the electromagnetic induction element 40 covers the tobacco bowl 11, and the tobacco bowl is connected to the outside air through the vent 41.

[0098] In the above embodiments, the electromagnetic heater 200 is movably mounted on the electromagnetic induction element 40. Unlike the above embodiments, the electromagnetic induction element 40 can also be directly and detachably connected to the electromagnetic heater 200, for example, snapped onto the bottom of the housing 20 of the electromagnetic heater 200, or screwed onto the bottom of the housing 20 of the electromagnetic heater 200.

[0099] In the above embodiment, there is a gap between the heat insulation chassis 21 of the electromagnetic heater 200 and the heating part 43 of the electromagnetic induction element 40 to form a flat heating cavity 400. Unlike the above embodiment, the bottom of the induction element 40 and / or the heat insulation chassis 21 is provided with one or more grooves that communicate with the vent hole 41. One end of a groove communicates with the air inlet 210 and the other end communicates with one or more vent holes 41. This solution allows the air inlet 210 and the vent hole 41 to be connected through a ventilation channel and does not have a heating cavity.

[0100] Unlike the above embodiments, refer to Figure 11 In the second embodiment of the present invention, the electromagnetic induction element 40 is tin foil wrapped around the mouth of the tobacco bowl 11. Several ventilation holes are punched in the tin foil above the mouth of the bowl. The heat insulation base 21 of the electromagnetic heater 200 is directly mounted on the mouth of the tobacco bowl 11. The outer protrusion 212 of the heat insulation base 21 is in concave-convex fit with the mouth of the tobacco bowl 11 (the guide protrusion 213 abuts against the inner upper edge of the tobacco bowl 11) to prevent the heat insulation base 21 from sliding out of the tobacco bowl 11 radially.

[0101] Unlike the first and second embodiments, refer to Figure 12 In the third embodiment of the present invention, the electromagnetic heater further includes a heat-resistant bowl cover 50 that can be placed on the bowl 11. The heat-resistant bowl cover 50 has a recessed cavity 51 at the position where it mates with the bowl 11. A through vent hole 511 is provided on the bottom wall of the cavity 51. The heat-insulating base 21 has an external boss 212 that mates with the cavity 51 in the middle. The housing 20 is movably mounted on the heat-resistant bowl cover. The external boss 212 extends into the cavity 51, forming an air inlet between the heat-resistant bowl cover 50 and the heat-insulating base 23 that communicates with the outside. The air inlet is connected to the vent hole 511.

[0102] In this embodiment, the heat-resistant bowl lid 50 is a ceramic lid. Of course, the heat-resistant bowl lid 50 can also be made of other non-magnetic and non-metallic materials, as long as it has good heat resistance. Materials with heat insulation properties are preferred.

[0103] In this embodiment, the heat-insulating base 21 is movably mounted on the heat-resistant bowl lid 50. In another embodiment, the heat-insulating base 21 can also be connected to the heat-resistant bowl lid 50 (fixed connection, snap-fit ​​connection, or other connection methods). In yet another embodiment, the heat-insulating base 21 is a bowl lid that directly supports the tobacco bowl 11, and an air passage communicating with the outside is opened at the position corresponding to the mouth of the tobacco bowl 11.

[0104] In this embodiment, the heat-resistant bowl lid 50 has an air guide groove that communicates with the vent 511 from the edge to the middle, and the other end of the air guide groove is connected to the air inlet.

[0105] Of course, in another embodiment, the depth of the receiving cavity 51 of the heat-resistant bowl cover 50 is greater than the distance from the support foot 211 to the outer protrusion 212, so that when the heat-insulating base 21 is mounted on the heat-resistant bowl cover 50, a heat-insulating cavity is formed between the outer protrusion 211 and the receiving cavity 51.

[0106] In this embodiment, the electromagnetic induction element 40b is a metal sheet or metal ring freely placed in the bowl 11. In this embodiment, the electromagnetic induction element 40b is a disposable item or a non-permanent item that can be used several times.

[0107] If the area of ​​the electromagnetic induction element 40b is large, through-holes can be made on the electromagnetic induction element 40b to facilitate the combustion of the smoke generator 10. Of course, the electromagnetic induction element 40b may not have through-holes.

[0108] refer to Figure 14This is the fourth embodiment of the present invention. Unlike the above embodiments, in this embodiment, the electromagnetic induction element 40b is recessed with a smoke-holding groove 43b for holding the smoke generator 10. The bottom of the smoke-holding groove 43b is provided with a vent hole 41 that communicates with the inside of the bowl 11. After air enters the smoke-holding groove 43b to assist the combustion of the smoke generator 10, the smoke passes through the vent hole 41 into the bowl 11 and enters the tobacco bottle 12 of the water pipe through the vent pipe 111 inside the bowl 11.

[0109] There is a gap between the electromagnetic induction element 40c and the air pipe 111 in the smoke bowl 11. The smoke-holding groove 43b also constitutes the heating part 43b of the electromagnetic induction element 40b.

[0110] Preferably, the heat-insulating chassis 21 of the electromagnetic inductor 200 is mounted on the electromagnetic inductor 40b, and an air inlet (between adjacent support legs 211) is formed between the electromagnetic inductor 40b and the air inlet communicating with the outside. The air inlet communicates with the smoke-collecting groove 43b. The heating part 43b is in concave-convex fit with the outer boss 211 on the heat-insulating chassis 21.

[0111] To prevent smoke from escaping, the heat-insulating chassis 21 of the electromagnetic sensor 200 is mounted on the electromagnetic induction element 40b and also covers the smoke-collecting groove 43b.

[0112] refer to Figure 15 This is the fourth embodiment of the present invention. Unlike the first embodiment, in this embodiment, the electromagnetic induction element 40c is recessed with a smoke-collecting groove 43c for holding the smoke generator 10. The smoke-collecting groove 43c is annular and corresponds to the smoke-collecting area of ​​the bowl 11. The bottom of the smoke-collecting groove 43c is provided with a vent hole 41 that communicates with the inside of the bowl 11. After air enters the smoke-collecting groove 43c to assist the combustion of the smoke generator 10, the smoke passes through the vent hole 41 into the bowl 11 and enters the tobacco bottle 12 of the water pipe through the vent pipe 111 inside the bowl 11.

[0113] There is a gap between the electromagnetic induction element 40c and the air pipe 111 in the smoke bowl 11. The smoke-holding groove 43c also constitutes the heating part 43c of the electromagnetic induction element 40b.

[0114] Preferably, the heat-insulating chassis 21 of the electromagnetic inductor 200 is mounted on the electromagnetic inductor 40c, and an air inlet (between adjacent support legs 211) is formed between the electromagnetic inductor 40c and the inductor 200 to communicate with the outside world. The air inlet is connected to the smoke-collecting groove 43c.

[0115] To prevent smoke from escaping, the heat-insulating chassis 21 of the electromagnetic inductor 200 is mounted on the electromagnetic inductor 40c and also covers the heating part 43c, and at the very least covers the smoke-collecting groove 43c.

[0116] In this embodiment, the heating element 40c can be a single piece, with its peripheral and central portions being made of the same material as the heating part 43c. In another embodiment, the heating element 40c can also be a fitted piece, with its central portion made of a different material from the heating part 43c. The central portion opposite to the vent pipe 111 is made of a non-magnetic and heat-resistant material, such as ceramic.

[0117] Of course, unlike the above embodiments, the electromagnetic inductor 200 in the first embodiment can be directly mounted on the bowl, and the electromagnetic inductor 40 can be freely placed inside the bowl 11, so that the electromagnetic inductor 200 can heat the electromagnetic inductor 40. The heat-insulating base 21 of the electromagnetic inductor 200 covers the bowl 11 and forms an air inlet 211 between it and the bowl 11.

[0118] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An electromagnetic heater for heating water pipes, characterized in that: The device includes a housing and an electromagnetic heating element installed inside the housing. The housing includes a heat-insulating chassis. The electromagnetic heating element includes an excitation coil and a drive circuit. The excitation coil is sheet-shaped and formed by a wire gradually spiraling outward around a center. The excitation coil faces the heat-insulating chassis. The drive circuit controls the excitation coil to emit a high-frequency AC signal that can cause the electromagnetic induction element to generate an eddy current effect outside the heat-insulating chassis. The heat-insulating chassis is provided with several support feet that support the housing. The support feet can support the top of the tobacco bowl and form an air inlet that communicates with the inside of the tobacco bowl between the heat-insulating chassis and the tobacco bowl. The heat-insulating chassis has an outward protrusion in the middle, and the back of the outward protrusion forms a recess in the periphery inside the housing, and the excitation coil is installed in the recess. The horizontal plane of the outer protrusion is lower than the end of the support foot. The support foot is located near the edge of the heat insulation chassis and distributed around the center of the heat insulation chassis. When the support foot is supported on the mouth of the tobacco bowl, the outer protrusion extends into the tobacco bowl. The outer protrusion has multiple engaging protrusions protruding outward from its periphery. The engaging protrusions are staggered with the support foot. The distance between the outer side of the engaging protrusion and the center of the heat insulation chassis is greater than or equal to the distance between the inner side of the support foot and the center of the heat insulation chassis, but less than the distance between the outer side of the support foot and the center of the heat insulation chassis. The outer end of the engaging protrusion is inclined to form a guide wall.

2. The electromagnetic heater as described in claim 1, characterized in that: A heating zone corresponding to the position of the excitation coil is formed in the middle of the surrounding support legs.

3. The electromagnetic heater as described in claim 1, characterized in that: It also includes a heat-resistant bowl cover that can be placed on a tobacco bowl. The upper surface of the heat-resistant bowl cover has a recessed cavity at the position where it matches the mouth of the tobacco bowl. A through hole is opened on the bottom wall of the cavity. The heat-insulating base has an external protrusion in the middle that matches the cavity. The shell is movably mounted on the heat-resistant bowl cover. The external protrusion extends into the cavity and forms an air inlet between the heat-resistant bowl cover and the heat-insulating base, which communicates with the outside. The air inlet is connected to the through hole.

4. The electromagnetic heater as described in claim 1, characterized in that: The electromagnetic heating body further includes a control unit and a power supply unit. The power supply unit supplies power to the drive circuit, and the control unit controls the operation of the drive circuit. The housing includes a top shell, a bottom shell, and an isolation cover installed between the top shell and the bottom shell. A first chamber for installing the control unit and the power supply unit is formed between the top shell and the isolation cover. A second chamber for installing the excitation coil is formed between the isolation cover and the bottom shell. The isolation cover isolates the first chamber and the second chamber. The heat-insulating chassis forms the bottom wall of the bottom shell.

5. The electromagnetic heater as described in claim 4, characterized in that: The middle of the isolation cover is recessed into the second chamber to form an isolation cavity, which is different from the first chamber. The side of the isolation cover opposite to the isolation cavity forms an outwardly protruding inner boss, and the excitation coil is installed between the inner boss and the heat insulation chassis.

6. The electromagnetic heater as described in claim 5, characterized in that: The excitation coil is mounted on the inner boss and has a gap between it and the heat-insulating chassis.

7. The electromagnetic heater as described in claim 6, characterized in that: The bottom shell includes an annular fixing frame and a heat-insulating chassis that engages with the annular fixing frame.

8. The electromagnetic heater as described in claim 1, characterized in that: An electromagnetic shielding plate is provided on the side of the excitation coil away from the heat-insulating chassis, and the excitation coil is mounted on the electromagnetic shielding plate.

9. The electromagnetic heater as described in claim 8, characterized in that: The electromagnetic shielding sheet has a radius hole that extends from the edge to the center. The excitation coil gradually spirals inward from the edge to the center along its first end and then leads out the second end of the excitation coil along the radius hole.

10. The electromagnetic heater as described in claim 1, characterized in that: The radial length of the conductor cross-section of the excitation coil is greater than the length along the centerline of the excitation coil.

11. The electromagnetic heater as described in claim 1, characterized in that: The heat-insulating chassis is a ceramic disc or a mica component.

12. A water fume electromagnetic heating device, characterized in that: The device includes an electromagnetic heater and an electromagnetic induction element. The electromagnetic induction element is installed at the tobacco bowl. The electromagnetic heater is an electromagnetic heater as described in any one of claims 1 to 11. The electromagnetic heater is installed above the tobacco bowl and the heat-insulating base is opposite to the mouth of the tobacco bowl. The excitation coil of the electromagnetic heater emits a high-frequency AC signal to cause the electromagnetic induction element to generate an eddy current effect.

13. The water fume electromagnetic heating device as described in claim 12, characterized in that: The electromagnetic induction element is a piece of tin foil wrapped around the mouth of the tobacco bowl, a metal sheet installed on the mouth of the tobacco bowl, or an electromagnetic induction sheet placed inside the tobacco bowl. The tin foil or metal sheet has several ventilation holes. The electromagnetic induction element heats the smoke-generating material in the tobacco bowl to produce smoke.

14. The water fume electromagnetic heating device as described in claim 12, characterized in that: The electromagnetic induction element is installed on the mouth of the tobacco bowl and has a smoke-collecting groove formed thereon. The smoke-collecting groove is used to collect smoke-generating materials. The electromagnetic induction element heats the smoke-generating materials in the smoke-collecting groove. The bottom of the smoke-collecting groove is provided with a vent hole that communicates with the inside of the tobacco bowl. After air enters the smoke-collecting groove to assist combustion and generate smoke, the generated smoke passes through the vent hole into the tobacco bowl and enters the tobacco bottle of the water pipe through the vent pipe inside the tobacco bowl.

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