Replaceable heating element water flue electromagnetic heating device

Abstract

This invention discloses a water pipe electromagnetic heating device with a replaceable heating element, comprising an electromagnetic heater and an electromagnetic induction element. The electromagnetic heater is movably mounted on or detachably connected to the electromagnetic induction element. The electromagnetic induction element is movably mounted on the rim of the pipe bowl, and a through-hole ventilation hole is provided above the rim. The electromagnetic heater can emit a high-frequency AC signal to the electromagnetic induction element to induce an eddy current effect, thereby heating the smoke generated inside the pipe bowl. An air inlet communicating with the outside is provided between the electromagnetic heater and the electromagnetic induction element, and the air inlet is also connected to the ventilation hole. This invention not only allows for quick replacement of the electromagnetic induction element, but also allows for heating via electromagnetic heating simply by placing the electromagnetic induction element on the pipe bowl. It offers high heating efficiency, convenient placement of the electromagnetic induction element, and quick removal of the element after use.

Description

Technical Field

[0001] This invention relates to water pipe heating, and more particularly to a water pipe electromagnetic heating device for heating water pipes. Background Technology

[0002] refer to 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 CN105336136A discloses an electronic hookah charcoal, comprising a shell, a heating element housed within the shell, a heat transfer plate installed at the bottom of the shell, a silicone sleeve fitted under the shell, and a heat-resistant metal mesh installed on a hookah container. In use, the shell is fitted onto the hookah container via the silicone sleeve, and then the heat-resistant metal mesh is placed between the tobacco and the heat transfer plate in the hookah container. The heating element heats the heat transfer plate, which in turn heats the tobacco downwards. On one hand, this electronic hookah charcoal has a long gap between the heating element and the tobacco, and the heat transfer plate further separates them, requiring heat transfer to the tobacco, making it difficult to provide sufficient heat and resulting in poor performance. On the other hand, to effectively seal the hookah container and prevent smoke from overflowing from the top, the electronic hookah charcoal must be fitted onto the container via a sealing sleeve with vents, requiring the silicone sleeve to be put on each time, which is inconvenient and difficult to remove promptly after use.

[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 a water pipe electromagnetic heating device with replaceable heating elements. It not only allows for quick replacement of the electromagnetic induction element and facilitates cleaning and replacement of the electromagnetic induction element, but also makes it convenient to use. Simply place the electromagnetic induction element and the electromagnetic heater on the pipe bowl.

[0008] To achieve the above objectives, the present invention discloses a water pipe electromagnetic heating device with replaceable heating element, comprising an electromagnetic heater and an electromagnetic induction element. The electromagnetic heater is movably mounted on the electromagnetic induction element or detachably connected to the electromagnetic induction element. The electromagnetic induction element is movably mounted on the mouth of the pipe bowl and has a through vent hole above the mouth of the pipe bowl. The electromagnetic heater can send a high-frequency AC signal to the electromagnetic induction element to generate an eddy current effect and heat the smoke generator inside the pipe bowl. Furthermore, there is an air inlet between the electromagnetic heater and the electromagnetic induction element that communicates with the outside, and the air inlet is also connected to the vent hole.

[0009] Preferably, the electromagnetic induction element is a tinplate stamping sheet, which is low in cost and can be replaced as a disposable item. Of course, the electromagnetic induction element can also be made of other metal materials capable of electromagnetic induction, such as stainless steel sheets or stainless iron sheets, or an induction element incorporating electromagnetic induction metal materials.

[0010] Preferably, the edge of the electromagnetic induction element supports the edge of the bowl and closes the periphery of the bowl, the middle of the electromagnetic induction element is recessed downward to form a heating part that extends into the bowl, and the vent is opened on the heating part.

[0011] Specifically, the heating element is a circular groove, a polygonal groove, or an annular groove.

[0012] Preferably, the electromagnetic heater includes a housing and an electromagnetic heating body installed in the housing. The housing includes a heat-insulating chassis, and the electromagnetic heating body includes an excitation coil and a drive circuit. The heat-insulating chassis is opposite to the heating part of the electromagnetic induction element and forms the air inlet between the chassis and the electromagnetic induction element. The drive circuit controls the excitation coil to emit a high-frequency AC signal to the outside of the heat-insulating chassis, which can cause the electromagnetic induction element to generate an eddy current effect.

[0013] Preferably, the heat-insulating chassis has an outwardly protruding platform in the middle, and the air inlet is higher than the outwardly protruding platform.

[0014] Specifically, the heat-insulating chassis has several supporting feet protruding outward from its periphery. The supporting feet are supported on the periphery of the electromagnetic induction element and form the air intake between adjacent supporting feet.

[0015] More specifically, the electromagnetic induction element has a downward recess in the middle to form a heating part that extends into the bowl. The housing of the electromagnetic heater includes a heat-insulating base at the bottom. The heat-insulating base has an outwardly protruding outer boss that mates with the recess of the heating part. The outer boss has multiple guide protrusions protruding outward along its periphery. The guide protrusions are staggered with the support feet. The distance between the outer side of the guide protrusion and the center of the heat-insulating base is greater than the distance between the inner side of the support foot and the center of the heat-insulating base. The outer end of the guide protrusion is inclined to form a guide wall. The heat-insulating base is movably mounted on the periphery of the electromagnetic induction element and mates with the heating part of the electromagnetic induction element.

[0016] Preferably, the housing of the electromagnetic heater includes a heat-insulating base located at the bottom, and there is a gap between the heat-insulating base and the heating part of the electromagnetic induction element to form a heating cavity. An air inlet is formed between the heat-insulating base and the periphery of the electromagnetic induction element to communicate with the outside. One end of the heating cavity is connected to the air inlet and the other end is connected to the ventilation hole. When smoking, the outside air enters the heating cavity through the air inlet, is heated by the electromagnetic induction element in the heating cavity, and then enters the tobacco bowl through the ventilation 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; 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 and electromagnetically shields the first chamber and the second chamber, and the heat-insulating chassis forms the bottom wall of the bottom shell.

[0018] More 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 boss and the heat insulation chassis.

[0019] More specifically, the excitation coil is mounted on the inner boss and has a gap between it and the heat-insulating chassis.

[0020] Specifically, the bottom shell includes an annular fixing frame and a heat-insulating chassis that engages with the annular fixing frame.

[0021] Specifically, a handle is formed on the outside of the housing.

[0022] Preferably, the electromagnetic induction element has a smoke-collecting groove formed on the rim of the bowl, which is used to collect the smoke-generating material. A vent is formed at the bottom of the smoke-collecting groove. Air enters the smoke-collecting groove through the air inlet to assist combustion and generate smoke. The generated smoke then passes through the vent into the bowl and, through a vent tube inside the bowl, enters the hookah bottle. This design eliminates the need to place the smoke-generating material inside the bowl; it can be placed on the electromagnetic induction element. Heating is convenient and efficient. Furthermore, the electromagnetic induction element can be easily removed for cleaning and is easy to replace after multiple uses.

[0023] Compared with existing technologies, this invention heats the smoke-generating material (tobacco or tobacco paste) in the tobacco bowl using electromagnetic heating. An electromagnetic induction element mounted on the tobacco bowl acts as the heating element, resulting in high heating efficiency and low power requirements for the power supply. Firstly, the electromagnetic output section (electromagnetic heater) and the electromagnetic induction section (electromagnetic induction element) are two independent parts. The electromagnetic induction element and the electromagnetic heater are detachably connected or completely independent. After use, the electromagnetic induction element can be removed separately for cleaning, making cleaning convenient and easy to replace. Furthermore, the electromagnetic induction element of this invention is directly and movably mounted on the tobacco bowl, eliminating the need for a fixed sleeve to seal the bowl or a cover, making it convenient to use. Moreover, the electromagnetic induction element of this invention only receives high-frequency electromagnetic signals from the electromagnetic heater to heat the tobacco. The electromagnetic induction element itself is not electrically connected to any circuit, significantly improving the stability and reliability of the system. Attached Figure Description

[0024] Figure 1 This is a structural diagram of a traditional hookah.

[0025] Figure 2 This is a perspective view of the electromagnetic heater of the present invention.

[0026] Figure 3This is a top view of the electromagnetic heater of the present invention.

[0027] Figure 4 This is an exploded perspective view of the electromagnetic heater of the present invention.

[0028] Figure 5 This is a structural diagram of the installation of the excitation coil and electromagnetic shielding sheet of the present invention.

[0029] Figure 6 This is a structural diagram of the excitation coil and electromagnetic shielding sheet of the present invention installed from another angle.

[0030] Figure 7a This is a structural block diagram of the electromagnetic heater of the present invention.

[0031] Figure 7b This is a structural diagram of the driving circuit in one embodiment of the present invention.

[0032] Figure 7c This is a structural diagram of the driving circuit in another embodiment of the present invention.

[0033] Figure 7d This is a structural diagram of the driving circuit in another embodiment of the present invention.

[0034] Figure 7e This is the main circuit diagram of the water fume electromagnetic heating device of the present invention.

[0035] 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.

[0036] Figure 9 This is a side view of the water fume electromagnetic heating device in the first embodiment of the present invention.

[0037] Figure 10 This is a structural diagram of the electromagnetic induction element in the first embodiment of the present invention.

[0038] Figure 11 This is a structural diagram of a water flue electromagnetic heating device installed on a water flue, which is different from the first embodiment of the present invention.

[0039] Figure 12 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.

[0040] Figure 13 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

[0041] 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.

[0042] refer to Figure 8 and Figure 9 This invention discloses an electromagnetic heating device for hookah, comprising an electromagnetic heater 200 and an electromagnetic induction element 40. The electromagnetic induction element 40 is movably mounted on the hookah bowl 11 and can contact the smoke generator 10 (tobacco shreds 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 above the rim of the bowl 11, which can emit a high-frequency AC signal to the electromagnetic induction element 40 to induce an eddy current effect. The electromagnetic heater 200 has an excitation coil 31 and a driving circuit 32, which can drive the excitation coil 31 to emit a high-frequency AC signal to induce an eddy current effect in the electromagnetic induction element 40.

[0043] The movable frame of this invention is an installation structure that allows for slight horizontal movement (non-clamping) and free lifting in the vertical direction (parallel to the center of the bowl). When the electromagnetic induction element 40 is lifted, the bowl 11 will not be moved and can be lifted directly. The electromagnetic induction element 40 is separately disposed from the electromagnetic heater 200, and only one component capable of electromagnetic induction is required for the electromagnetic induction element 40, such as a metal sheet, which is low in cost and easy to replace.

[0044] refer to Figures 2 to 4 The 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 drive circuit 32. The excitation coil 31 is sheet-shaped and formed by a conductor 311 gradually spiraling outwards around a center. The excitation coil 31 faces the heat-insulating chassis 21. The drive 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. The heat-insulating chassis 21 supports the entire power supply drive module 30 and prevents heat from the heating element 40 from being transferred into the power supply drive module 30.

[0045] 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 tobacco bowl 11 and form an air inlet 210 communicating with the tobacco bowl 11 between the heat-insulating base 21 and the tobacco 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 tobacco bowl.

[0046] Specifically, in this embodiment, the electromagnetic induction element 40 is a metal sheet mounted on the rim of the tobacco bowl 11.

[0047] refer to Figure 1 and Figure 8 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 generates smoke. When a person inhales through the smoking pipe 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 pipe 13 through the ventilation pipe 111. After being filtered in the filtered water 121 through the filter pipe 13, it passes through the smoking pipe 122 and is inhaled by the person.

[0048] 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 supports 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 can also be a polygonal groove or a groove of other shapes. In another embodiment, the periphery 42 of the electromagnetic heating element 40 consists of multiple support arms and does not cover the rim of the tobacco bowl 11, but is merely mounted on the tobacco bowl 11.

[0049] refer to Figure 11 In another embodiment, the heating element 43a can also be an annular groove. In this case, the heating element can extend below the top of the ventilation pipe 111 of the bowl, or it can extend above the ventilation pipe 111. In this embodiment, the heating element 40 can be a single piece, with its peripheral and central portions made of the same material as the heating element 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 element 43a. The central portion opposite the ventilation pipe 111 is made of a non-magnetic and heat-resistant material, such as ceramic.

[0050] The electromagnetic induction element 40 also includes an operating handle 44 extending outward from the periphery 42. The user can use a clip to hold 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.

[0051] In this embodiment, the electromagnetic induction element 40 is stamped from a metal sheet (such as tinplate). Of course, the electromagnetic induction element 40 can also be other metal sheets such as stainless steel sheets or stainless iron sheets.

[0052] The heat-insulating base 54 and the heating part 43 of the electromagnetic induction element 40 are spaced 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.

[0053] In one embodiment, in order to better cover the bowl 11, the electromagnetic induction element 40 has a downwardly bent edge outside the 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.

[0054] 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.

[0055] Preferably, the heat-insulating chassis 21 has an outwardly protruding boss 212 in the middle, and the back of the outwardly protruding boss 212 forms a recessed pit on the periphery inside the housing 20, and the excitation coil 31 is installed in the recessed pit.

[0056] 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.

[0057] 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 electromagnetic induction element 40.

[0058] refer to Figure 2 and Figure 3 The outer protrusion 212 has multiple guide protrusions 213 protruding outward from its periphery. The 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 insulation chassis 21 is greater than or equal to the distance between the inner side of the support foot 211 and the center of the heat insulation chassis 21, but less than the distance between the outer side of the support foot 211 and the center of the heat insulation chassis 21. The outer end of the guide protrusion 213 is inclined to form a guide wall.

[0059] In this design, a guide channel is formed between adjacent guide protrusions 213, extending longitudinally along the centerline of the smoke container 11. A heating chamber 400 is formed between the outer protrusion 212 and the heating part 43. Multiple guide channels are located above and outside the heating chamber 400. This design requires air to first descend from the air inlet for a period of time before entering the heating chamber 400 horizontally. The air inlet 210 is located on the upper outer side of the heating chamber 400, and the guide channels extend from top to bottom.

[0060] 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, spherical, inverted tent-like, etc., and is not limited to a plate shape.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 a 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] refer to Figure 7c In another embodiment, the driving circuit 32 can be a half-bridge driving circuit.

[0073] 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.

[0074] refer to Figure 7d In another embodiment, the driving circuit 32 is a Class E amplifier circuit.

[0075] 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.

[0076] 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).

[0077] 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.

[0078] 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.

[0079] 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.

[0080] refer to Figure 4 and Figure 8 The bottom shell 23 includes an annular fixing frame 230 and a heat-insulating chassis 21 that is engaged 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, such as mica sheets, and is not limited to ceramic discs.

[0081] 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.

[0082] refer to Figures 2 to 4 The outer surface of the housing 20 is provided with a handle 25 for gripping.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] Of course, in other embodiments, the cross-section of the excitation coil 31 can also be circular or square.

[0089] In the above embodiment, the electromagnetic induction element 40 covers the bowl 11, that is, the bowl is connected to the outside air through the vent 41.

[0090] 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.

[0091] 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.

[0092] refer to Figure 12 This is the second 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.

[0093] 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.

[0094] 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 engagement with the outer boss 211 on the heat-insulating chassis 21.

[0095] 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.

[0096] refer to Figure 13 This is the third 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.

[0097] There is a gap between the electromagnetic induction element 40c and the air pipe 111 in the bowl 11. The smoke-holding groove 43c also constitutes the heating part 43c of the electromagnetic induction element 40b.

[0098] 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 electromagnetic inductor 40c to communicate with the outside world. The air inlet is connected to the smoke-collecting groove 43c.

[0099] 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.

[0100] 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.

[0101] 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. A water pipe electromagnetic heating device with replaceable heating elements, characterized in that: The device includes an electromagnetic heater and an electromagnetic induction element. The electromagnetic heater is movably mounted on the electromagnetic induction element or detachably connected to the electromagnetic induction element. The electromagnetic induction element is movably mounted on the rim of the tobacco bowl and has a through vent hole above the rim of the tobacco bowl. The electromagnetic heater can send a high-frequency AC signal to the electromagnetic induction element to generate an eddy current effect and heat the smoke generator inside the tobacco bowl. There is an air inlet between the electromagnetic heater and the electromagnetic induction element that communicates with the outside world. The air inlet is also connected to the vent hole. The housing of the electromagnetic heater includes a heat-insulating chassis at the bottom, and a plurality of support feet protrude outward from the periphery of the heat-insulating chassis. The support feet are supported on the periphery of the electromagnetic induction element and form the air inlet between adjacent support feet.

2. The water fume electromagnetic heating device as described in claim 1, characterized in that: The electromagnetic induction element is a tinplate stamping sheet, a stainless steel sheet, or a stainless iron sheet.

3. The water fume electromagnetic heating device as described in claim 1, characterized in that: The edge of the electromagnetic induction element supports the edge of the bowl and closes the circumference of the bowl. The middle of the electromagnetic induction element is recessed downward to form a heating part that extends into the bowl. The vent is opened on the heating part.

4. The water fume electromagnetic heating device as described in claim 3, characterized in that: The heating element is a circular groove, a polygonal groove, or an annular groove.

5. The water fume electromagnetic heating device as described in claim 1, characterized in that: The electromagnetic induction element has a downward recess in the middle to form a heating part that extends into the bowl. The housing of the electromagnetic heater includes a heat-insulating base at the bottom. The heat-insulating base has an outwardly protruding platform that mates with the recess of the heating part. The outer edge of the outer protruding platform has multiple guide protrusions that are staggered with the support foot. The distance between the outer side of the guide protrusion and the center of the heat-insulating base is greater than the distance between the inner side of the support foot and the center of the heat-insulating base. The outer end of the guide protrusion is inclined to form a guide wall. The heat-insulating base is movably mounted on the periphery of the electromagnetic induction element and mates with the heating part of the electromagnetic induction element.

6. The water fume electromagnetic heating device as described in claim 1 or 5, characterized in that: The housing of the electromagnetic heater includes a heat-insulating base located at the bottom. There is a gap between the heat-insulating base and the heating part of the electromagnetic induction element to form a heating cavity. An air inlet is formed between the heat-insulating base and the periphery of the electromagnetic induction element to communicate with the outside. One end of the heating cavity is connected to the air inlet and the other end is connected to the ventilation hole. When smoking, the outside air enters the heating cavity through the air inlet, is heated by the electromagnetic induction element in the heating cavity, and then enters the tobacco bowl through the ventilation hole.

7. The water fume electromagnetic heating device as described in claim 1, characterized in that: The electromagnetic heater includes a housing and an electromagnetic heating body installed inside the housing. The housing includes a heat-insulating chassis. The electromagnetic heating body includes an excitation coil and a drive circuit. The heat-insulating chassis is opposite to the heating part of the electromagnetic induction element and forms the air inlet between the chassis and the electromagnetic induction element. The drive circuit controls the excitation coil to emit a high-frequency AC signal to the outside of the heat-insulating chassis, which can cause the electromagnetic induction element to generate an eddy current effect.

8. The water fume electromagnetic heating device as described in claim 7, 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 and electromagnetically shields the first chamber and the second chamber. The heat-insulating chassis forms the bottom wall of the bottom shell.

9. The water fume electromagnetic heating device as described in claim 8, 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 boss and the heat insulation chassis.

10. The water fume electromagnetic heating device as described in claim 9, characterized in that: The excitation coil is mounted on the inner boss and has a gap between it and the heat-insulating chassis.

11. The water fume electromagnetic heating device as described in claim 8, characterized in that: The bottom shell includes an annular fixing frame and a heat-insulating chassis that engages with the annular fixing frame.

12. The water fume electromagnetic heating device as described in claim 8, characterized in that: A handle is formed on the outside of the housing.

13. The water fume electromagnetic heating device as described in claim 1, characterized in that: The electromagnetic induction element forms a smoke-collecting groove at the mouth of the bowl, which is used to collect smoke products. The ventilation hole is formed at the bottom of the smoke-collecting groove. Air enters the smoke-collecting groove through the air inlet to assist combustion and generate smoke. The generated smoke passes through the ventilation hole into the bowl and enters the water pipe inside the bowl.

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