CN114680388A - Electronic atomization device with multiple heating bodies switched - Google Patents

Abstract

The invention discloses an electronic atomization device with multiple heating bodies switched, which comprises a heating circuit consisting of a power supply, a switch unit, a switching unit and a heating unit, wherein: the heating unit comprises a plurality of heating bodies; the input end of the switching unit is connected with the switch unit, and the output end of the switching unit is respectively and independently connected with each heating body in the plurality of heating bodies and used for connecting one or more heating bodies into the working loop in a manual or automatic mode; and the input end of the switch unit is connected with the power supply, and the output end of the switch unit is connected with the switching unit and used for switching on or off the power supply in a manual or automatic mode so as to control the whole heating circuit to be switched on and off. The invention prolongs the service life of the disposable electronic atomization device and increases the number of the suction ports.

Description

An electronic atomization device with multiple heating element switching

technical field

The invention relates to the technical field of electronic atomization devices, in particular to an electronic atomization device with multiple heating elements switched.

Background technique

Electronic atomizing devices such as electronic cigarettes are classified into single-use and multiple-use types. One of the multiple-use electronic cigarette structures is an electronic cigarette that can replace the cartridge type. However, the cartridge cost of the cartridge-replaceable electronic cigarette is very high, which will greatly increase the consumption cost for primary users. Therefore, primary users generally use disposable pods to try to quit smoking.

However, at present, the disposable pods on the market generally suffer from the problems of a small number of smoking ports and a short service life.

Therefore, the existing technology still needs to be improved.

SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an electronic atomization device with multiple heating elements switching, which aims to prolong the service life of the disposable electronic atomization device and increase the number of suction ports.

To achieve the above object, the present invention has adopted the following technical solutions:

An electronic atomization device with multiple heating elements switching, which includes a heating circuit composed of a power supply, a switching unit, a switching unit, and a heating unit, wherein:

The heating unit includes a plurality of heating bodies;

a switching unit, the input end of which is connected to the switching unit, and the output end of which is separately connected to each heating body in the plurality of heating bodies, for manually or automatically connecting one or more heating bodies to the working circuit;

The switch unit, whose input end is connected with the power supply, and whose output end is connected with the switching unit, is used to manually or automatically turn on or off the power supply to control the on and off of the entire heating circuit.

Wherein, the control method of the heating circuit is:

S10, manually or automatically adjust the switching unit, so that one or more of the heating elements are connected to the working circuit;

S20, manually or automatically operate the switch unit to turn on or off the power;

S30, after the power supply is turned on, the heating element connected in step S10 enters a working state;

S40, when the switching condition is reached, repeat steps S10-S30 to switch to another or several other heating elements for work, or directly force the heating element to be switched;

S50, the steps S10-S40 are repeated until the life span of all the heating elements is exhausted.

Wherein, the switching condition is: odor is generated during suction, or,

The heating element is used for suction to reach a predetermined number of suction ports.

The switch unit is an intelligent air switch, including an integrated microphone head and a control circuit board, the microphone head is electrically connected to the control circuit board, the microphone head detects changes in airflow pressure and generates a trigger signal to send to the control circuit board to control the The circuit board turns on and off the entire heating circuit according to the trigger signal.

Wherein, the control circuit board is provided with a main control unit, a storage unit and a counting unit electrically connected to the main control unit, the storage unit is used to store the predetermined number of suction ports when each heating element is used, and the counting unit is used for each heating element. The actual number of suction ports when a heating body is in use is counted, and the main control unit is used to compare the number of predetermined suction ports with the actual number of suction ports, and send an alarm message when the actual number of suction ports reaches the predetermined number of suction ports.

Wherein, the control circuit board is also provided with an alarm unit electrically connected with the main control unit, for receiving the alarm information sent by the main control unit and performing vibration alarm or sound and light alarm.

Wherein, the switching unit is a DIP switch, and after the switching condition is reached, the DIP switch is manually operated to switch the heating element.

Wherein, the switching unit is an automatic switching switch, and after reaching the switching condition, the intelligent air switch drives the automatic switching switch to automatically switch the heating element.

Wherein, the electronic atomization device includes a housing, an atomizing core arranged in the housing, and a suction nozzle covered outside the atomizing core, the suction nozzle is provided with an oil filling port, and the suction nozzle is located outside the atomizing core A tank is formed directly.

Wherein, the atomizing core includes an air guide nozzle, an upper cover, a heating element mounting seat and a base that are sealed and connected in sequence, an air guide tube is arranged in the middle of the suction nozzle to connect with the air guide nozzle, and the atomizing core also includes a set of Three heating elements and three liquid-conducting elements are placed in the same cavity, and three U-shaped grooves are arranged on the heating element mounting base at intervals to place the three liquid-conducting elements and the heating elements, and each heating element is wound. In the middle of a liquid-conducting piece, the two ends of each liquid-conducting piece pass through the heating element mounting seat and extend into the oil tank.

The electronic atomization device with multiple heating elements switching of the present invention is provided with a plurality of heating elements in the heating unit in the heating circuit, and a switching unit is arranged to switch among the plurality of heating elements, thus, compared with the existing single heating element The electronic atomization device of the heating element, the electronic atomization device of the present invention greatly improves the service life of the electronic atomization device through the switching of multiple heating elements, and also greatly increases the number of suction ports of the electronic atomization device. When used as a disposable pod, the service life and the number of puffs are increased, so the cost-effectiveness of the product is improved.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

1 is a schematic diagram of the heating circuit principle of an electronic atomizer device with multiple heating elements switched according to the present invention;

2 is a schematic structural diagram of a first embodiment of an electronic atomization device with multiple heating elements switched according to the present invention;

Fig. 3 is the exploded schematic diagram of Fig. 2;

Fig. 4 is the sectional schematic diagram of Fig. 2;

5 is a schematic diagram of the control flow of the heating circuit of the electronic atomizer device with multiple heating elements switched according to the present invention;

6 is a schematic diagram of an embodiment of the heating circuit of the present invention;

7 is a schematic diagram of the circuit composition of the control circuit board of the present invention;

Fig. 8 is another cross-sectional schematic diagram of Fig. 2;

9 is a schematic structural diagram of a suction nozzle and an atomizing core in the electronic atomization device of the present invention;

Fig. 10 is the structural representation of the atomizing core of the present invention;

FIG. 11 is an exploded schematic view of the structure of FIG. 10 .

Description of reference numbers:

100-UAV, 1-Power supply, 2-Switch unit, 21-Microphone, 22-Control circuit board, 221-Main control unit, 222-Storage unit, 223-Counting unit, 224-Alarm unit, 3-Switch Unit, 4- Heating unit, 41- Heating body, 42- Electrode pin, 5- Shell, 6- Atomizing core, 61- Air guide nozzle, 62- Top cover, 63- Heating body mounting seat, 631-U groove, 64-base, 65-liquid guide, 7-suction nozzle, 71-oil filling port, 72-air pipe, 73-plastic plug, 8-oil tank, 9-support, 11-USB interface circuit board.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described here are only a part of the embodiments of the present invention, rather than all the embodiments. . The specific embodiments herein are only used to explain the present invention, and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In the present invention, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or an integrated; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal communication between two elements or an interaction relationship between the two elements, unless otherwise explicitly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, descriptions such as "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature.

Please refer to FIG. 1 to FIG. 3 , the present invention provides an electronic atomization device 100 with multiple heating elements switching, including a heating circuit composed of a power supply 1, a switching unit 2, a switching unit 3, and a heating unit 4. The power supply 1 can be An external power supply or a lithium battery, the power supply 1 of the present invention adopts a lithium battery. in:

The heat generating unit 4 includes a plurality of heat generating bodies 41 . The heating body 41 may be a heating wire, a heating tube and other components, and the heating unit 4 further includes electrode pins 42 connected to the heating body 41 , and the electrode pins 42 are connected to the heating circuit through electrodes. The heating element 41 is in contact with the e-liquid in the electronic atomization device 100, and the e-liquid is heated and then atomized. In the embodiment of the present invention, the plurality of heating elements 41 are connected in parallel.

The switching unit 3, whose input end is connected to the switching unit 2, and whose output end is separately connected to each heating body 41 in the plurality of heating bodies 41, is used to connect one or more heating bodies 41 manually or automatically working circuit. As shown in FIG. 1 , the output end of the switching unit 3 is provided with a separate connection line to be connected to a heating element 41 respectively. In this way, by controlling the output end of the switching unit 3, it is possible to control which specific heating element 41 is connected to the working circuit. . As shown in Figure 1, the a-circuit of the output end of the control switching unit 3 is turned on, while the b and c-circuits are disconnected, then the heating element 41 connected to the output end a is connected to the working circuit, and the heating element 41 connected to the output ends b and c is connected to the working circuit. Disconnect from heating work circuit. In this way, when the whole heating circuit works, the heating element 41 connected with a performs heating and atomization, while the heating elements 41 connected with b and c do not participate in the heating and atomization.

Therefore, in the electronic atomization device 100 of the present invention, the number of suction ports of the electronic atomization device 100 is increased, and the number of suction ports of the electronic atomization device 100 is increased, and the number of suction ports of the electronic atomization device 100 is increased, and the number of suction ports of the electronic atomization device 100 is increased, and the number of suction ports of the electronic atomization device 100 is increased. Product life. Existing disposable electronic atomization devices, such as disposable cigarettes, are configured with a single heating element 41. Generally, the number of suction ports of a single heating element 41 is about 1,000 to reach the service life of the heating element 41. If the heating element 41 is heated and atomized, peculiar smell will be generated during smoking, so only the disposable cigarettes can be thrown away, and the electronic atomizing device 100 of the present invention overcomes this defect, as the electronic atomizing device 100 of the present invention is configured With three heating elements connected in parallel, the number of suction ports can be increased to about 3,000, which greatly prolongs the service life of the electronic atomization device 100 of the present invention.

The switching unit 3 may be a manual switching operation or an automatic control switching.

The electronic atomization device 100 of the present invention further includes a switch unit 2, the input end of which is connected to the power source 1, and the output end of which is connected to the switch unit 3, for manually or automatically turning on or off the power source 1 to control the entire heating circuit. on and off. The function of the switch unit 2 is to control the opening and closing of the entire heating circuit. The switch unit 2 may be a manual switch or an automatic switch.

The electronic atomization device 100 with multiple heating elements switching of the present invention is provided with a plurality of heating elements 41 in the heating unit 4 in the heating circuit, and a switching unit 3 is arranged to switch among the plurality of heating elements 41. In this way, Compared with the existing electronic atomization device with a single heating element 41, the electronic atomization device 100 of the present invention greatly improves the service life of the electronic atomization device 100 through the switching operation of the multiple heating elements 41, and also greatly increases the performance of the electronic atomization device 100. The number of suction ports of the electronic atomizer 100 . When the electronic atomizing device 100 of the present invention is used as a small cigarette, the service life and the number of suction ports are increased, so the cost performance of the product is improved, and it is convenient to carry.

Specifically, as shown in FIG. 5 , the control method of the heating circuit of the electronic atomization device 100 of the present invention is as follows:

S10, manually or automatically adjust the switching unit so that one or more heating elements are connected to the working circuit.

Before or during the suction, manually or automatically adjust the switching unit 3 so that one of the heating elements 41 in the heating unit 4 is connected to the heating working circuit.

S20, manually or automatically operate the switch unit to turn on or off the power.

When the switch unit 2 is in the manual operation mode, the power is turned on or off manually by the user.

When the switch unit 2 is in automatic operation mode, if an intelligent air switch is used, during the suction process, the intelligent air switch detects the pressure change during suction and turns on or off the power supply 1 according to the pressure change. For example, during suction, the pressure difference between the inside and outside of the smart air switch becomes larger, and the larger pressure difference signal triggers a conduction signal to turn on the power supply 1 . When the suction is stopped, the pressure difference between the inside and outside of the smart air switch is zero, and the zero pressure difference signal triggers a shutdown signal to turn off the power supply 1 .

S30, after the power supply is turned on, the heating element connected in step S10 enters a working state.

After the power supply 1 is turned on, the entire heating working circuit is turned on, and the heating element 41 selected in step S10 enters the working state to heat and atomize the e-liquid.

If the heating element 41 is not switched, the heating element 41 will be repeatedly heated and atomized according to the user's suction action.

S40, when the switching condition is reached, repeat steps S10-S30 to switch to another or several other heating elements for work, or directly force the switching of heating elements.

That is, when the heating element 41 selected in step S10 reaches the service life, it can be manually or automatically switched to another heating element 41 or several other heating elements 41 of the electronic atomization device 100 of the present invention for heating.

The switching condition of the embodiment of the present invention is: generating an odor during suction, or using the heating element to suction to reach a predetermined number of suction ports.

If the user feels that the smell of the atomized e-liquid is abnormal and smells abnormal when smoking, he can switch it manually. Alternatively, when the heating body 41 reaches a predetermined number of suction ports, such as 1000 ports, it can be switched automatically through a control program built into the electronic atomization device 100 .

Of course, the electronic atomizing device 100 of the present invention can forcibly switch the heating element 41 at any time during use, that is, the user can also forcibly switch the heating element 41 if no odor is generated or the predetermined number of suction ports is not reached.

S50, the steps S10-S40 are repeated until the life span of all the heating elements is exhausted.

The above steps are repeated so that each heating element 41 can be fully used, so as to maximize the service life of the electronic atomization device 100 of the present invention.

As shown in FIG. 6 , the switch unit 2 of the electronic atomizing device 100 of the present invention is an intelligent air switch, including a microphone head 21 and a control circuit board 22 integrated into one body, the microphone head is electrically connected to the control circuit board 22 , and the microphone head 21 Detect the change of air pressure and generate a trigger signal to send to the control circuit board 22, and the control circuit board 22 turns on and off the entire heating circuit according to the trigger signal.

That is, the switch unit 2 of the electronic atomization device 100 of the present invention is an intelligent air switch integrated by the microphone head 21 and the control circuit board 22, that is, it has the function of an air switch and can control the entire heating circuit. The pressure change during suction triggers the opening and closing of the entire circuit.

As an embodiment, as shown in FIG. 3 and FIG. 6 , the switching unit 3 is a DIP switch. After the switching condition is reached, the DIP switch is manually operated to switch the heating element.

That is, in this embodiment, the heating element 41 is switched by manually operating the DIP switch. The condition for manual switching is that an odor is generated during suction, or, the heating body 41 is used to suction to reach a predetermined number of suction ports and an alarm prompt is issued; or the switch is directly forced.

As another embodiment, the switching unit 3 is an automatic switching switch. After the switching condition is reached, the intelligent air switch drives the automatic switching switch to automatically switch the heating element.

That is, in this embodiment, the intelligent air switch drives the automatic switching switch to automatically switch the heating element 41 through the built-in control program. The condition for automatic switching is to use the heating element 41 to achieve a predetermined number of suction ports. If the actual number of suction ports of the heating element 41 reaches a predetermined number of suction ports, such as 1000 ports, the intelligent air switch controls the automatic switching switch action, and the switching operation is performed. Go to another heating element 41 for work.

As shown in FIG. 7 , the control circuit board 22 of the electronic atomization device 100 of the present invention is provided with a main control unit 221, a storage unit 222 and a counting unit 223 electrically connected to the main control unit 221, and the storage unit 222 is used to store each The predetermined number of suction ports when the heating element 41 is used, the counting unit 223 is used to count the actual number of suction ports when each heating element 41 is used, and the main control unit 221 is used to compare the predetermined number of suction ports with the actual number of suction ports , when the actual number of suction ports reaches the predetermined number of suction ports, an alarm message will be issued.

The main control unit 221 can be controlled by an MCU, and the storage unit 222 stores the predetermined number of suction ports for each heating element 41 in the heating unit 4 , for example, each heating element 41 is scheduled to be used for 1000 suction ports. The counting unit records the actual number of suction ports of each heating element 41 in real time, and then the main control unit 221 obtains the predetermined number of suction ports for the heating element 41 in the storage unit, and takes the actual number of suction ports for the heating element 41 in the counting unit 223 and performs the operation. Compared.

Further, the control circuit board 22 of the electronic atomization device 100 of the present invention is also provided with an alarm unit 224 that is electrically connected to the main control unit 221 for receiving the alarm information sent by the main control unit 221 and performing vibration alarm or sound and light alarm. . The alarm unit 224 is used to remind the user that the current number of suction ports of the heating body 41 during use reaches a predetermined number of suction ports and the heating body 41 needs to be switched.

Specifically, as shown in FIGS. 2 , 3 , 4 and 8 , the electronic atomization device 100 of the present invention includes a casing 5 , an atomizing core 6 disposed in the casing 5 , and an atomizing core 6 disposed outside the casing 6 . The suction nozzle 7 is provided with an oil filling port 71, and a leak-proof rubber plug 73 is installed outside the oil filling port 71. An oil tank 8 is directly formed in the suction nozzle 7 outside the atomizing core 6 .

That is to say, the suction nozzle 7 of the present invention is directly used as the oil tank 8 and is integrally constructed with the oil tank 8 . In this way, the oil tank 8 of the present invention is larger than the oil tank 8 in the prior art, which increases the amount of oil fume of the disposable small smoke.

The housing 5 of the present invention is provided with a bracket 9 , as shown in FIG. 4 , for installing the power supply 1 , the atomizing core 6 , and the switch unit 2 . The bracket 9 separates the power supply 1 from the atomizing core 6 and the switch unit 2 . The atomizing core 6 is located at the upper end of the bracket 9 , and the switch unit 2 is located below the atomizing core 6 .

Further, as shown in FIG. 9 to FIG. 11 , the atomizing core 6 of the electronic atomizing device 100 of the present invention includes an air guide nozzle 61 , an upper cover 62 , a heating element mounting seat 63 and a base 64 that are sealed and connected in sequence. 7. An air guide tube 72 is arranged in the middle to connect with the air guide nozzle 61. The atomizing core 6 also includes three heating bodies 41 and three liquid guiding parts 65 arranged in the same cavity. The heating body mounting seat 63 is provided with three U-shaped grooves 631 at intervals to place the three liquid-conducting members 65 and the heating element 41, each heating element 41 is wound in the middle of a liquid-conducting The end passes through the heating element mounting seat 63 and extends into the oil tank 8 .

The three heating bodies 41 and the three liquid-conducting members 65 in the embodiment of the present invention are arranged in the same cavity of the atomizing core 6, so as to ensure that the atomization amount and the airflow will not have obvious differences when switching different heating bodies 41 to work. The difference ensures the experience effect of suction, and the atomization is stable and the taste is better.

Preferably, a USB interface circuit board 11 is also plugged and connected to the bottom of the bracket 9 . In this way, it is convenient to charge the electronic atomizer device through the USB interface, and at the same time, the USB interface circuit board 11 can be quickly installed by the plug-in connection.

The electronic atomization device 100 with multiple heating element switching proposed in the embodiment of the present invention is provided with a plurality of heating elements 41 in the heating unit 4 in the heating circuit, and a switching unit 3 is arranged to switch among the plurality of heating elements 41. In this way, compared with the existing electronic atomizing device with a single heating element, the electronic atomizing device 100 of the present invention greatly improves the service life of the electronic atomizing device 100 through the switching operation of the multiple heating elements 41, and also greatly improves the The number of suction ports of the electronic atomization device 100 is increased. When used as a disposable pod, the service life and the number of suction ports are both increased, which improves the cost performance of the product.

The above is only an example to clearly illustrate the present invention, and is not intended to limit the scope of the present invention. It is impossible to list all the embodiments here. Under the concept of the present invention, the content of the technical solution of the present invention is used. Equivalent structural transformations made, or direct/indirect applications in other related technical fields are all included in the scope of patent protection of the present invention.

Claims (10)

1. The utility model provides an electronic atomizing device that many heating elements switch, its characterized in that includes the heating circuit who comprises power, switch element, switching unit, the unit that generates heat, wherein:

the heating unit comprises a plurality of heating bodies;

the input end of the switching unit is connected with the switch unit, and the output end of the switching unit is respectively and independently connected with each heating body in the plurality of heating bodies and used for connecting one or more heating bodies into the working loop in a manual or automatic mode;

and the input end of the switch unit is connected with the power supply, and the output end of the switch unit is connected with the switching unit and used for switching on or off the power supply in a manual or automatic mode so as to control the whole heating circuit to be switched on and off.

2. The multi-heat-generating-body switching electronic atomizer according to claim 1, wherein the control method of the heating circuit comprises:

s10, manually or automatically adjusting the switching unit to enable one or more heating elements to be connected into the working loop;

s20, manually or automatically operating the switch unit to turn on or off the power supply;

s30, after the power is switched on, the heating element accessed in the step S10 enters a working state;

s40, when the switching condition is reached, repeating the steps S10-S30 to switch to another or other heating elements for working or directly and forcibly switch the heating elements;

s50, the steps S10-S40 are circulated until the lives of all the heating elements are exhausted.

3. The multiple heat-generating body switching electronic atomizer according to claim 2, wherein said switching conditions are: the peculiar smell is generated during the suction, or,

the heating element is used to suck up to a predetermined number of suction ports.

4. The multi-heating-body switching electronic atomizer of claim 3, wherein the switch unit is an intelligent air switch, and comprises a microphone and a control circuit board integrated into a whole, the microphone is electrically connected to the control circuit board, the microphone detects the airflow pressure change and generates a trigger signal to be sent to the control circuit board, and the control circuit board turns on and off the whole heating circuit according to the trigger signal.

5. The electronic atomizing device with multiple heat generating bodies switched according to claim 4, wherein a main control unit, a storage unit electrically connected with the main control unit and a counting unit are arranged in the control circuit board, the storage unit is used for storing the preset number of the suction ports when each heat generating body is used, the counting unit is used for counting the actual number of the suction ports when each heat generating body is used, the main control unit is used for comparing the preset number of the suction ports with the actual number of the suction ports, and when the actual number of the suction ports reaches the preset number of the suction ports, an alarm message is sent out.

6. The electronic atomization device switched by multiple heating bodies according to claim 5, wherein an alarm unit electrically connected with the main control unit is further arranged in the control circuit board and used for receiving alarm information sent by the main control unit and carrying out vibration alarm or sound and light alarm.

7. The multi-heater switching electronic atomizer of claim 4, wherein said switching means is a dial switch, and said dial switch is manually operated to switch heaters after a switching condition is reached.

8. The electronic atomization device with switching of multiple heating elements according to claim 4, wherein the switching unit is an automatic switch, and after a switching condition is reached, the intelligent air switch drives the automatic switch to automatically switch the heating elements.

9. The electronic atomization device with multiple switched heaters of claim 1, wherein the electronic atomization device comprises a housing, an atomization core disposed in the housing, and a suction nozzle covering the atomization core, the suction nozzle is opened with an oil injection port, and an oil tank is directly formed outside the atomization core in the suction nozzle.

10. The multiple heat-generating body switching electronic atomizer of claim 9, wherein the atomizing core comprises a gas nozzle, an upper cover, a heat-generating body mounting seat and a base, which are sequentially and hermetically connected, the middle of the suction nozzle is provided with a gas tube connected with the gas nozzle, the atomizing core further comprises three heat-generating bodies and three liquid-guiding members disposed in the same cavity, the heat-generating body mounting seat is provided with three U-shaped grooves at intervals for placing the three liquid-guiding members and the heat-generating bodies, each heat-generating body is wound around the middle of one liquid-guiding member, and each heat-generating body extends out of the two ends of the liquid-guiding member and into the oil chamber.

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