Preheated hookah heating device

Abstract

The present invention discloses a preheating hookah heating device, comprising a power supply drive device and a heating element. The power supply drive device includes a housing and a power supply drive module installed within the housing. The heating element includes a heating portion, which is installed outside the bottom shell of the housing at a distance, forming a heating chamber between the heating portion and the bottom shell. The sidewall of the heating chamber has an air inlet connected to the outside world, and the heating portion has a through-hole. The power supply drive module drives the heating portion to generate heat. The hookah heating device can be installed above a smoke container and cover the smoke container entrance. The heating portion extends into the smoke container and can heat the smoke-generating medium within the smoke container. When smoking, air enters the heating chamber through the air inlet and is heated by the heating element. The heated air then passes through the vent and enters the smoke container. Compared with the prior art, the present invention has high heating efficiency, smooth smoking, and a good smoking experience.

Description

Technical Field

[0001] The present invention relates to heating a hookah, and in particular to an electronic heating device for heating a hookah. Background Art

[0002] refer to Figure 1 A hookah typically consists of a container 11 for holding shredded tobacco 10 or tobacco paste, a pipe 12 for holding filtered water 121, and a pipe 122 mounted on the side of the pipe 12. A vent pipe 111 is located at the bottom of the container 11, connecting it to the interior of the container 11. A filter pipe 13 connects the vent pipe 111 to the filtered water 121 in the pipe 12. To use, first fill the pipe 12 with water, ensuring that the filtered water 121 covers the filter pipe 13 by a finger. The water level should not be too high. Then, place the container 11 on the pipe 12, insert the pipe 111 into the filter pipe 13, and install a silicone seal 14 between the container 11 and the pipe 12. Next, place tobacco 10 in the tobacco container 11, cover the entire container with a small piece of tinfoil, poke some holes in it, place the burned charcoal on top of the tinfoil, insert the smoking pipe 15 into the smoke pipe 122, and start smoking by picking up the mouthpiece at the end of the smoking pipe 15. When smoking, the charcoal heats the tobacco 10 in the tobacco container 11 through the tinfoil, causing it to burn. When smoking from outside the smoking pipe 15, air enters the tobacco container 11 through the holes in the tinfoil, passes through the tobacco 10, and then enters the filtered water 121 through the filter pipe 13. After being filtered, it passes through the smoke pipe 122 and the smoking pipe 15 to be inhaled.

[0003] However, this traditional hookah heating technology is not only complex to operate, but also difficult to control the temperature of the charcoal, resulting in a less-than-strong smoke. Furthermore, the burning charcoal during smoking produces harmful gases that are harmful to the human body if inhaled. Charcoal burning is an open flame, making it prone to fires. The burning charcoal also produces ash, which pollutes the environment.

[0004] To this end, patent CN203952409U discloses an electrically heated hookah bowl. A heated metal tube is directly installed at the bottom of the bowl, and an eddy current coil is wound around the heated metal tube. During use, the eddy current coil directly heats the heated metal tube, causing the heated metal tube to heat and burn the tobacco. However, this electrically heated hookah bowl is difficult to clean after use. After prolonged use, excessive burnt tobacco stains accumulate under the bowl, making the bowl's heating efficiency extremely low. Furthermore, the heating source is located at the bottom of the bowl, making it difficult for air to enter the heated area evenly. This results in insufficiently even burning of the tobacco, especially during the initial smoking phase. Furthermore, when smoking, cold air from the outside directly enters the bowl, affecting the temperature of the tobacco and resulting in a poor smoking experience.

[0005] Chinese patent CN101483942A discloses a hookah electronic carbon, which uses high thermal conductivity ceramics as a collective to replace hookah charcoal. However, when this hookah electronic carbon is used, on the one hand, it will block some pores on the tin foil, making it difficult for air to enter the tobacco bowl, limiting the amount of smoke, and often having a poor effect when used for multiple people to smoke. On the other hand, this hookah electronic carbon can only heat the tin foil through its thermal conductivity, and then heat the tobacco through the tin foil. Like existing hookah charcoal, the heating efficiency is poor. In order to increase the heating efficiency, a very powerful and large transformer is often required for power supply.

[0006] Therefore, a hookah heating device that can solve the above problems is badly needed. Summary of the Invention

[0007] The purpose of the present invention is to provide a hookah heating device with high heating efficiency, smooth smoking and good smoking experience.

[0008] In order to achieve the above-mentioned objectives, the present invention discloses a hookah heating device, comprising a power supply drive device and a heating element, the power supply drive device comprising a shell and a power supply drive module installed in the shell, the heating element comprising a heating part, the heating part being installed at a distance outside the bottom shell of the shell, and forming a heating chamber between the heating part and the bottom shell, the side wall of the heating chamber having an air inlet hole connected to the outside, the heating part having a through air vent, the power supply drive module driving the heating part to generate heat, the hookah heating device can be installed above a smoke container and cover the entrance of the smoke container, the heating part extends into the smoke container and can heat the smoke generating medium in the smoke container, when smoking, air enters the heating chamber through the air inlet hole and is heated by the heating element, and the heated air passes through the air vent into the smoke container.

[0009] Preferably, when the hookah heating device is installed on the smoke container, the heating portion is sheet-shaped and is placed at the inlet of the smoke container in a horizontal direction.

[0010] Preferably, a plurality of supporting legs are protruding from the periphery of the bottom shell, and the heating element further comprises a periphery surrounding the heating portion, and the periphery of the heating element can contact the ends of the supporting legs and form the air inlet holes between the periphery and the supporting legs.

[0011] Preferably, the heating chamber and the air inlet are connected by a guide channel. There are multiple guide channels and they are located above the outside of the heating chamber and gradually extend downward from the outside to the inside to prevent convection of the air inlet of the heating chamber and reduce the heated air from overflowing the heating chamber.

[0012] Specifically, the middle of the bottom shell protrudes toward the heating element to form an external boss, the heating part is located in the middle of the heating element, the heating part of the heating element is recessed relative to the peripheral edge of the heating element to form an inner groove relative to the spacing of the external boss, the external boss extends into the inner groove, the heating chamber is formed between the table surface of the external boss and the heating part, and the guide channel is formed between the outer side surface of the external boss and the groove wall of the inner groove.

[0013] Specifically, a plurality of interference protrusions are provided on the outer side surface of the outer boss around its circumference, the outer boss contacts the groove wall of the inner groove through the interference protrusions, and the guide channel is formed between adjacent interference protrusions.

[0014] More specifically, the bottom shell is provided with a plurality of support feet arranged at intervals along the circumference, the heating element can contact the ends of the support feet and form the air inlet holes between the support feet, and the support feet and the interference protrusions are staggered. This solution further reduces the air convection in the heating chamber.

[0015] More specifically, the distance between the outer side of the abutment protrusion and the center of the bottom shell is greater than or equal to the distance between the inner side of the support leg and the center of the bottom shell, and less than the distance between the outer side of the support leg and the center of the bottom shell. This solution allows external air to be split in the middle by the abutment protrusion when entering through the air inlet, and then introduced along both sides of the abutment protrusion.

[0016] Preferably, the bottom shell is a heat-insulating chassis. Of course, the bottom shell can also be other heat-resistant shells or heat-insulating shells.

[0017] Specifically, the heat-insulating chassis is a ceramic disk or a mica sheet, and of course it can also be made of other heat-insulating and high-temperature resistant materials that are not magnetically isolating or magnetically sensitive.

[0018] Preferably, the heating part is an electric heating plate, and the power supply driving module supplies power to the heating part and controls the heating part to generate heat.

[0019] Preferably, the heating part is an electromagnetic induction element, and the power supply driving module provides a high-frequency AC signal to the heating part so that the heating part generates an eddy current effect to heat the heating part.

[0020] Preferably, the bottom of the heating portion of the heating element is in the shape of a flat sheet parallel to the inlet of the smoke container, and the position of the bottom shell relative to the heating portion is flat, so that the heating cavity is flat.

[0021] Preferably, the bottom periphery of the hookah heating device is movably supported on the inlet of the smoke container, and is matched with the inlet of the smoke container through the heating portion.

[0022] Compared to existing technologies, the present invention features a water pipe heating device located above the inlet of the cigarette container, covering the cigarette container. This allows the heating element, which heats the tobacco, to extend directly into the cigarette container. During operation, the heating element can be directly controlled to heat the tobacco within the cigarette container, resulting in high heating efficiency. Furthermore, the present invention forms a heating chamber between the heating element and the bottom shell of the power drive device. Air entering the cigarette container must first enter the heating chamber to be preheated by the heating element. This ensures that the air entering the cigarette container is hot. This ensures a stable temperature for the tobacco within the cigarette container, providing a superior smoking experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the structure of a traditional hookah.

[0024] Figure 2 It is a three-dimensional diagram of the power supply drive device of the present invention.

[0025] Figure 3 It is a top view of the power supply drive device of the present invention.

[0026] Figure 4 It is a three-dimensional exploded view of the power supply drive device of the present invention.

[0027] Figure 5 It is a structural diagram of the installation of the excitation coil and the electromagnetic shielding sheet of the present invention.

[0028] Figure 6 This is a structural diagram of the excitation coil and electromagnetic shielding sheet installed at another angle of the present invention.

[0029] Figure 7a It is a structural block diagram of the power supply drive device of the present invention.

[0030] Figure 7b FIG. 1 is a structural diagram of a driving circuit in one embodiment of the present invention.

[0031] Figure 7c is a structural diagram of a driving circuit in another embodiment of the present invention.

[0032] Figure 7d FIG. 4 is a structural diagram of a driving circuit in another embodiment of the present invention.

[0033] Figure 7e This is the main circuit diagram of the hookah heating device of the present invention.

[0034] Figure 8 This is a structural diagram of the hookah heating device installed on the hookah in the first embodiment of the present invention.

[0035] Figure 9 It is a side view of the hookah heating device in the first embodiment of the present invention.

[0036] Figure 10It is a structural diagram of the electromagnetic induction component in the first embodiment of the present invention.

[0037] Figure 11 This is a structural diagram of a hookah heating device installed on a hookah in another embodiment different from the first embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0039] refer to Figure 8 and Figure 9 The present invention discloses a hookah heating device, including a power supply drive device 200 and a heating element 40. The power supply drive device 200 includes a shell 20 and a power supply drive module 30 installed in the shell 20. The heating element 40 includes a heating portion 43. The heating portion 43 is installed outside the bottom shell 21 of the shell 20 at a distance, and a heating cavity 400 is formed between the heating portion 43 and the bottom shell 21. The side wall of the heating cavity 400 has an air inlet 210 connected to the outside. A through vent hole 41 is provided on the part 43, and the power supply drive module 30 drives the heating part 43 to generate heat. The hookah heating device can be installed above the smoke container 11 and cover the entrance of the smoke container 11. The heating part 43 extends into the smoke container 11 and can heat the smoke generating medium 10 (tobacco or tobacco paste) in the smoke container 11. When smoking, air enters the heating chamber 400 through the air inlet hole 210 and is heated by the heating element 40. The heated air passes through the vent hole 41 and enters the smoke container 11.

[0040] In this embodiment, the heating element 40 is movably mounted on the smoke container 11 of the hookah and extends into the smoke container 11 to contact the smoke product 10 within the smoke container 11. The power supply drive device 200 is movably mounted on the heating element 40 and can drive the heating element 40 to generate heat, thereby heating the smoke product 10. Of course, the heating element 40 can also be mounted (including fixed installation, snap-on installation, threaded installation, etc.) on the bottom housing 21 of the power supply drive device 200, and then the bottom housing 21 of the power supply drive device 200 can be directly mounted on the smoke container inlet of the smoke container 11. Of course, the hookah heating device can also be mounted on the smoke container 11 through a heat-resistant sleeve.

[0041] refer to Figures 2 to 4In this embodiment, the power drive device 200 is an electromagnetic heater, and the heating element 40 is an electromagnetic induction element. The power drive device 200 includes an excitation coil 31 and a drive circuit 32. The drive circuit 32 drives the excitation coil 31 to generate a high-frequency AC signal, which causes the heating element 40 to generate an eddy current effect. Of course, unlike this embodiment, the heating portion 43 of the heating element 40 can also be a resistive heating element, such as a ceramic heating plate. The power drive device 200 supplies power to the heating portion 43 of the heating element 40 to generate heat. Of course, the heating element 40 can also be another type of heater capable of heating the aerosol-generating material 10, which can generate heat directly under electrical drive without the need for other components to conduct heat energy. In this embodiment, the heating portion 43 of the heating element 40 and the other components are a single piece made of the same material. Unlike this embodiment, the heating portion 43 of the heating element 40 and the other components of the heating element 40 can also be a hybrid assembly made of different materials.

[0042] Specifically, the power supply drive module 30 is an electromagnetic heating body 30, and the bottom shell of the shell 20 is an 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 is formed by a wire 311 gradually spiraling outward around a center. The excitation coil 31 is facing the direction of the insulating chassis 21. The drive circuit 32 controls the excitation coil 31 to emit a high-frequency AC signal to the outside of the insulating chassis 21, which can cause the heating element 40 to generate an eddy current effect. Among them, the excitation coil 31 is formed by a wire 31 spiraling in a plane. The insulating chassis 21 is used to support the entire power supply drive module 30 and prevent the heat of the heating element 40 from being transferred into the power supply drive module 30.

[0043] Of course, the bottom shell does not need to be a heat-insulating chassis, as long as the contact area between the shell 20 and the heating element 40 is a high-temperature resistant part.

[0044] refer to Figure 8 and Figure 9The electromagnetic inductor 200 is movably mounted on the heating element 40, and an air inlet 210 communicating with the outside world is provided between the power supply drive device 200 and the heating element 40. The air inlet 210 is also connected to the heating chamber 40. One end of the heating chamber 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 chamber 210 through the air inlet 41, and after being heated by the heating element 40 in the heating chamber 210, enters the smoke container 11 through the vent 41. Place the power drive device 200 on the heating element 40 and turn on the switch. The heating element 40 will generate an eddy current effect and generate heat. If no cigarette is smoked, the air remaining in the heating chamber 400 will be heated by the heating element 40, so that the outside of the electromagnetic induction element is hot air. On the one hand, when smoking, the air entering the smoke generator 10 from the outside is warm air, which improves the smoking experience. On the other hand, it also makes the temperature in the smoke container high and stable enough, the temperature change of the heating element 40 is small, and the combustion of the smoke generator 10 is stable.

[0045] The heat-insulating chassis 21 is provided with a plurality of supporting legs 211 for supporting the shell 20 . The supporting legs 211 can be supported on the smoke container 11 , and air inlets 210 communicating with the heating chamber 400 are formed between adjacent supporting legs 211 .

[0046] In this embodiment, the heating element 40 is a metal sheet mounted at the entrance of the smoke container 11. The support legs 211 can be located at the edge of the heat-insulating chassis 21 or in the middle of the heat-insulating chassis 21, and the heat-insulating chassis 21 can be suspended on the smoke container.

[0047] refer to Figure 1 and Figure 8 When smoking, the driving circuit 32 can drive the excitation coil 31 to emit a high-frequency AC signal to cause the heating element 40 to generate an eddy current effect, so that the heating element 40 heats the smoke generator 10 and the heating chamber 400, and the smoke generator 10 then generates smoke. When a person inhales the smoking tube 15, air enters the heating chamber 400 from the air inlet 210, passes through the ventilation hole 41 from the heating chamber 400 and enters the smoke container 11, and the smoke generated in the smoke container 11 is passed through the ventilation pipe 111 into the filter tube 13, and then enters the filtered water 121 from the filter tube 13 for filtration, and then passes through the smoke pipe 122 through the smoking tube 15 to be inhaled by the person.

[0048] refer to Figure 8 and Figure 10In this embodiment, the heating element 40 mounted on the smoke container 11 includes a peripheral edge 42 and a downwardly recessed heating portion 43. The peripheral edge 42 is supported on the edge of the smoke container 11's smoke container inlet and seals the inlet edge to prevent smoke from escaping from the inlet edge. The lower surface of the central heating portion 43 is recessed within the smoke container 11 and, in conjunction with the peripheral edge 42, the heating element 40 simultaneously forms a lid covering the smoke container 11. In this embodiment, the heating portion 43 is a circular groove, but it may also be a polygonal groove or other shape.

[0049] refer to Figure 11 In another embodiment, the heating portion 43a may also be an annular groove. In this case, the heating portion may extend below the top of the ventilation pipe 111 of the smoke container, or may extend above the ventilation pipe 111.

[0050] The heating element 40 further includes an operating handle 44 extending outward from the peripheral edge 42. The user can use a clip to clamp the operating handle 44 to remove the used heating element 40 from the smoke container 11. The operating handle 44 has a hanging hole 441, through which the user can hang the heating element 40 on a hook for storage.

[0051] In this embodiment, the heating element 40 is stamped from a metal sheet (e.g., tinplate). Of course, the heating portion 43 of the heating element 40 can also be made of other materials that can undergo electromagnetic induction, such as stainless steel sheets, stainless iron sheets, or other materials mixed with electromagnetic induction metal materials, and can be sheet materials or other shapes.

[0052] In one embodiment, in order to better cover the smoke container 11 , the peripheral edge 42 of the heating element 40 further has a lower bent edge bent downward to wrap the peripheral edge of the smoke container 11 , and an operating handle 44 is formed at the end of the lower bent edge.

[0053] refer to Figure 2 and Figure 3 , a plurality of the support legs 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 surrounded by the plurality of the support legs 211. Specifically, the support legs 211 are arranged near the edge of the heat-insulating chassis 21.

[0054] Preferably, an outer boss 212 is extended outward from the middle of the heat-insulating chassis 21 , and a recessed pit is formed on the back of the outer boss 212 in the shell 20 , and the excitation coil 31 is installed in the recess.

[0055] Specifically, the horizontal plane where the surface of the outer boss 212 is located is lower than the end of the support leg 211. The support leg 211 is arranged near the edge of the heat-insulating chassis 21 and distributed around the center of the heat-insulating chassis 21. When the support leg 211 is supported on the smoke container inlet of the smoke container 11, the outer boss 212 extends into the smoke container 11.

[0056] In this embodiment, the supporting legs 211 are supported on the peripheral edge 42 of the heating element 40 , and the outer boss 212 extends into the recess of the central heating portion 43 , and fits in the concave and convex of the heating element 40 .

[0057] refer to Figure 2 and Figure 3 The outer boss 212 is provided with a plurality of interfering protrusions 213 protruding outward along its periphery. The interfering protrusions 213 are staggered with the supporting legs 211. The distance between the outer side of the interfering protrusions 213 and the center of the heat-insulating chassis 21 is greater than or equal to the distance between the inner side of the supporting legs 211 and the center of the heat-insulating chassis 21, and is less than the distance between the outer side of the supporting legs 211 and the center of the heat-insulating chassis 21. The outer end of the interfering protrusion 213 is inclined to form a guide wall.

[0058] The heating portion 43 of the heating element 40 is recessed relative to the peripheral edge 42 of the heating element 40 to form an inner groove with a relative spacing to the outer boss 211, and the outer boss 211 extends into the inner groove. The heating chamber 400 is formed between the table surface of the outer boss 211 and the heating portion 43, and the guide channel is formed between the outer side surface of the outer boss 211 and the groove wall of the inner groove.

[0059] Specifically, guide channels are formed between adjacent abutting protrusions 213, extending longitudinally along the centerline of the smoke container 11. The heating chamber 400 is formed between the outer boss 212 and the heating portion 43. Multiple guide channels are provided, located above and outside the heating chamber 400. This arrangement requires air to first flow downward through the air inlet for a period of time before entering the heating chamber 400 horizontally. The air inlet 210 is located above and outside the heating chamber 400, and the guide channels extend from top to bottom.

[0060] In this embodiment, the bottom of the heating portion 43 of the heating element 40 is in the shape of a flat sheet parallel to the inlet of the smoke container 11. The bottom shell 21 is also flat relative to the heating portion 43, thereby making the heating chamber 400 flat. Of course, the bottom of the heating portion 43 of the electromagnetic induction element 40 can also be in a conical shape, a downward-sloping triangle, a cone, a sphere, an inverted tent, or other shapes, and is not limited to a sheet 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 driving circuit 32 , and the control unit 33 controls the operation of the driving circuit 32 .

[0062] refer to Figure 7a , which 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. The power management unit 342 converts the electrical energy in the storage battery into a corresponding voltage and transmits it to the drive circuit 32 to power the drive circuit 32.

[0063] Among them, 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, converts the external AC power into a power supply voltage and transmits it to the power management unit 342. The power management unit 342 converts the power supply voltage into a corresponding voltage and transmits it to the drive circuit 32 to power the drive circuit 32.

[0064] The DC interface 345 is also connected to the power management unit 343, which converts the electrical energy input from the DC interface 345 into a corresponding voltage and transmits it to the drive circuit 32 to power the drive circuit 32. The DC interface 345 can be a DC power supply interface such as a USB interface, MRI USB, or Type-C. In this embodiment, the storage battery 341 is a lithium battery.

[0065] As described above, this embodiment provides three power input modes: auxiliary power supply, DC interface power supply, and battery power supply. Control unit 33 is connected to power management unit 342 and controls power management unit 342 to select a power input mode based on priority. The priority, from high to low, is: auxiliary power supply, DC interface power supply, and battery power supply. 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 , is a circuit schematic 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 the battery power supply V BATThe power management unit 342 converts electrical energy inputted via various 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 comprises a resonant capacitor and a resonant inductor (excitation coil 31) connected in series. The LC network transmits the high-frequency AC signal to the heating element 40, which receives the high-frequency AC signal to generate an eddy current effect, thereby generating heat. The electromagnetic heating body 30 also includes a voltage detection circuit 331 and a current detection circuit 332, which respectively detect 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 transmitted to the heating element 40, an induced current is generated in the heating element 40. Because the resistivity of the heating element 40 varies with temperature, within the normal temperature range, the resistivity of the heating element 40 varies linearly with temperature. The relationship can be expressed as: ρ = ρ0(1 + αt), where ρ and ρ0 are the resistivity at the current temperature, t°C, and 0°C, respectively; α is the temperature coefficient of the resistivity of the heating element 40; and t is the temperature of the electromagnetic induction element. Therefore, the change in resistance of the heating element 40 is linearly related to the change in temperature. Specifically, t = (R - R0) / (R0 * α), where R and R0 are the resistance values ​​at the current temperature, t°C, and 0°C, respectively, and α is the temperature coefficient of the resistivity of the heating element 40. This formula indicates that as the temperature rises, the resistance of the heating element 40 also increases. Consequently, the current in the LC network loop decreases, and the power fed back to the driver circuit 32 also decreases. In other words, the power of the driver circuit within the LC network also decreases. The power of the driver circuit is linearly related to the temperature of the heating element 40. According to the power calculation formula P=UI, the temperature of the heating element 40 can be calculated as long as the power of the drive circuit is calculated. The memory of the control unit 33 stores the current value, voltage value, power value, power-to-temperature coefficient, set temperature, etc. of the drive circuit corresponding to the temperature control. When the entire system starts working, the control unit 33 obtains the current and voltage in the drive circuit detected by the voltage detection circuit 331 and the current detection circuit 332 in real time, calculates the power of the drive circuit based on the current and voltage, calculates the temperature of the heating element 40 based on the power-to-temperature coefficient, and compares the set temperature with the temperature of the heating element 40. When the temperature of the heating element 40 is greater than the set value, the control unit 33 controls the drive circuit 32 to suspend outputting the control signal to the LC network, and the heating element 40 stops heating. When the temperature of the heating element 40 is less than the set value, the drive circuit 32 continues to output the control signal to the LC network, and the heating element 40 continues heating, thereby achieving temperature control.

[0068] Preferably, during the temperature control process, the detected temperature of the heating element 40 is integrated in real time, and the upper and lower limits of the temperature integral are predetermined. When the temperature integral rapidly exceeds the upper limit, smoking is determined 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 operation of the drive circuit 32. The MCU also detects the presence of an electromagnetic induction element through the detection circuit. If not, it enters a standby state, detecting at a preset frequency. Upon detecting an electromagnetic induction element, it enters an operating state. The detection circuit includes a voltage detection circuit 331 and a current detection circuit 332. The MCU can determine the presence of an electromagnetic induction element based on the voltage and current collected by the voltage detection circuit 331 and the current detection circuit 332. The MCU, the switch button 333, the detection circuit, and the drive circuit 32 are all mounted on the 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 drive circuit 32 is composed of MOS transistors Q1, Q2, Q3, and Q4, and together with the LC network, forms the main loop of the high-frequency signal generation circuit. The LC network is composed of a resonant capacitor C1 and a resonant inductor L1. The resonant inductor L1 is the inductance equivalent to the excitation coil 31, and R is the resistance equivalent to the electromagnetic induction element. It is used to receive the high-frequency AC signal transmitted by the inductor L1 to generate heat. The LC network is a series resonant network with a resonant frequency of: f0 =1 / 2π√L1C1; when control unit 33 controls drive circuit 32 so that the drive signal frequency f = f0, the circuit will resonate. The operating timing is: 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 may be a half-bridge driving circuit.

[0073] The drive circuit 32 is composed of MOS transistors Q5 and Q6, and together with the LC network, forms the main loop 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. It is used to receive the high-frequency AC signal transmitted by the inductor L1, thereby generating heat. The LC network is a series resonant network with a resonant frequency of f0 = 1 / 2π√L1C1. When the control unit 33 controls the drive circuit 32 so that the drive signal frequency f = f0, the circuit will resonate. The operating sequence is: 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 drive circuit is composed of a MOS transistor Q7, a capacitor C2, and a high-frequency choke L0, and together with the LC network, forms the main loop of the high-frequency signal generation circuit. The LC network is composed of a resonant capacitor C1 and a resonant inductor L1. The resonant inductor L1 is the inductance equivalent to the excitation coil 31, and R is the equivalent resistance of the electromagnetic induction element. It is used to receive the high-frequency AC signal transmitted by the inductor L1 to generate heat. The LC network is a series resonant network with a resonant frequency of f0 = 1 / 2π√L1C1. When the control unit 33 controls the drive circuit 32 to operate so 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 housing 22, a bottom housing 23, and an isolation cover 24 installed between the top housing 22 and the bottom housing 23. A first chamber 201 for mounting the control unit 33 and the power supply unit is formed between the top housing 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 housing 23. The isolation cover 24 separates the first chamber 201 from the second chamber 202. The heat-insulating chassis 21 forms the bottom wall of the bottom housing 23. The isolation cover 24 can effectively isolate the control and power supply portion of the electromagnetic heating body 30 from the electromagnetic generating portion (excitation coil 31), thereby reducing the thermal and electromagnetic effects between the control and power supply portion and the electromagnetic generating portion (excitation coil 31).

[0077] refer to Figure 4 and Figure 8The middle of the isolation cover 24 is recessed toward the second chamber 202 to form an isolation chamber 203. The isolation chamber 203 is different from the first chamber 201. The side of the isolation cover 24 facing away from the isolation chamber 203 forms an inner boss 241 protruding outward. The excitation coil 31 is installed between the inner boss 241 and the thermal insulation chassis 21.

[0078] refer to Figure 8 The excitation coil 31 is mounted on the inner boss 241 and has a distance between it and the heat insulation chassis 21 .

[0079] In this embodiment, the edge of the isolation cover 24 has several mounting positions, and the isolation cover 24 is installed on the top shell 22 through the mounting positions. There are mutually cooperating mounting components between the top shell 22 and the lower shell 23, and the top shell 22 and the lower shell 23 are installed together through the mounting components. When the shell 20 is assembled, the control unit 33 and the power supply unit are first installed in the top shell 22, and then the isolation cover 24 is installed on the top shell 22 to close the first chamber 201, and then the excitation coil 31 is installed on the inner boss 241 of the isolation cover 24, and then the lower shell 23 is installed on the top shell 22 to close the second chamber 202.

[0080] refer to Figure 4 and Figure 8 The lower shell 23 includes an annular fixing frame 230 and a heat-insulating chassis 21 engaged with the annular fixing frame 230. Figure 4 , the heat-insulating chassis 21 is a ceramic disk. Of course, the heat-insulating chassis 21 can also be made of other non-magnetic non-metallic heat-insulating materials, such as mica sheets, and is not limited to ceramic disks.

[0081] In this embodiment, the thermal insulation chassis 21 is an integral piece made of the same material. In one embodiment, the position of the thermal insulation chassis 21 that contacts the electromagnetic induction component 40 is made of thermal insulation and high-temperature resistant material, and the material of other places that do not contact the electromagnetic induction component 40 has lower requirements for high-temperature resistance. The thermal insulation characteristics of the thermal insulation chassis 21 are determined by the cavity formed by the heating cavity between the thermal insulation chassis 21 and the electromagnetic induction component 40.

[0082] refer to Figures 2 to 4 A handle 25 is formed on the outside of the shell 20 for holding.

[0083] refer to Figure 5 and Figure 8 An electromagnetic shielding sheet 35 is provided on the side of the excitation coil 31 away from the thermally insulated chassis 21, and the excitation coil 31 is mounted on the electromagnetic shielding sheet 35. The electromagnetic shielding sheet effectively prevents the electromagnetic field of the excitation coil 31 from affecting the control and power supply components of the first chamber 201. The electromagnetic shielding sheet can be made of a high-magnetic-permeability material to shield metal parts from eddy currents generated in other directions.

[0084] refer to Figure 5 and Figure 6 The electromagnetic shielding sheet 35 has a radius hole 351 extending 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-section of the wire 311 of the excitation coil 31 has a radial length (length in the width direction) greater than the length along the center line (length in the thickness direction), and the thickness surface of the wire 311 is opposite to the heat-insulating chassis 21.

[0086] Better, reference Figure 5 and Figure 6 The wire 311 of the excitation coil 31 is flat (its cross-section may be rectangular, elliptical, etc.), with its flat surface facing the thermally insulated chassis 21. Of course, the cross-section of the wire 311 of the excitation coil 31 may also be triangular or trapezoidal. The wire 311 of the excitation coil 31 may consist of a single conductor wrapped in an insulating layer, or may consist of multiple conductors wrapped in an insulating layer.

[0087] In the above embodiment, the heat-insulating chassis 21 of the power supply drive device 200 is indirectly mounted on the smoke container 11 through the heating element 40. The heat-insulating chassis 21 and the heating element 40 have a concave-convex matching structure for radial limiting to prevent the heat-insulating chassis 21 from radially sliding out of the heating element 40.

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

[0089] In the above embodiment, the heating element 40 covers the smoke container 11 , that is, the smoke container is connected to the outside air through the vent hole 41 .

[0090] In the above embodiment, the power supply drive device 200 is movably mounted on the heating element 40. Different from the above embodiment, the heating element 40 can also be directly detachably connected to the power supply drive device 200, for example, it can be snapped onto the bottom of the shell 20 of the power supply drive device 200, or screwed onto the bottom of the shell 20 of the power supply drive device 200.

[0091] In the above embodiment, a distance is provided between the heat-insulating chassis 21 of the power supply driving device 200 and the heating portion 43 of the heating element 40 to form a flat heating chamber 400 .

[0092] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims

1. A preheating hookah heating device, characterized in that: The invention comprises a power supply drive device and a heating element, wherein the power supply drive device comprises a shell and a power supply drive module installed in the shell, the heating element comprises a heating part, the heating part is installed outside the bottom shell of the shell at a distance, and a heating chamber is formed between the heating part and the bottom shell, the side wall of the heating chamber has an air inlet hole connected to the outside, and the heating part is provided with a through vent hole, the power supply drive module drives the heating part to generate heat, the hookah heating device can be installed above the smoke container and cover the smoke container entrance, the heating part extends into the smoke container and can heat the smoke generating medium in the smoke container, when smoking, air enters the heating chamber through the air inlet hole and is heated by the heating element, and the heated air passes through the vent hole and enters the smoke container; A plurality of supporting legs are protruding from the periphery of the bottom shell, and the heating element further includes a periphery surrounding the heating portion. The periphery of the heating element can contact the ends of the supporting legs and form the air inlet between the periphery and the supporting legs.

2. The hookah heating device according to claim 1, characterized in that: When the hookah heating device is installed on the smoke container, the heating part is sheet-shaped and is placed at the entrance of the smoke container in a horizontal direction.

3. The hookah heating device according to claim 1, wherein: The heating chamber is connected to the air inlet through a guide channel. There are multiple guide channels located above the outer side of the heating chamber and gradually extending downward from the outside to the inside.

4. The hookah heating device according to claim 3, characterized in that: The middle of the bottom shell protrudes toward the heating element to form an external boss, the heating part is located in the middle of the heating element, the heating part of the heating element is recessed relative to the peripheral edge of the heating element to form an inner groove relative to the spacing of the external boss, the external boss extends into the inner groove, the heating chamber is formed between the table surface of the external boss and the heating part, and the guide channel is formed between the outer side surface of the external boss and the groove wall of the inner groove.

5. The hookah heating device according to claim 4, characterized in that: The outer side surface of the outer boss is provided with a plurality of interference protrusions around its circumference, and the outer boss contacts the groove wall of the inner groove through the interference protrusions, and the guide channel is formed between adjacent interference protrusions.

6. The hookah heating device according to claim 5, characterized in that: The bottom shell is provided with a plurality of support feet arranged at intervals along the circumference thereof. The heating element can contact the ends of the support feet and form the air inlet holes between the support feet. The support feet and the abutting protrusions are arranged in an alternating manner.

7. The hookah heating device according to claim 6, characterized in that: The distance between the outer side of the interference protrusion and the center of the bottom shell is greater than or equal to the distance between the inner side of the supporting foot and the center of the bottom shell, and is less than the distance between the outer side of the supporting foot and the center of the bottom shell.

8. The hookah heating device according to claim 1, wherein: The bottom shell is a heat-insulating chassis.

9. The hookah heating device according to claim 8, characterized in that: The heat-insulating chassis is a ceramic plate or a mica sheet.

10. The hookah heating device according to claim 1, characterized in that: The heating part is an electric heating plate, and the power supply driving module supplies power to the heating part and controls the heating part to generate heat; or, the heating part is an electromagnetic induction element, and the power supply driving module provides a high-frequency AC signal to the heating part so that the heating part generates an eddy current effect and is heated.

11. The hookah heating device according to claim 1, characterized in that: The bottom of the heating part of the heating element is in the shape of a flat sheet parallel to the inlet of the smoke container, and the position of the bottom shell relative to the heating part is flat, so that the heating cavity is flat.

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