WO2022116559A1 - Heat insulation structure and aerosol generation device - Google Patents

Abstract

A heat insulation structure and an aerosol generation device. The heat insulation structure is used inside a housing (200) of the aerosol generation device and comprises an inner support (10), an airflow separator (20) and a heat insulation base (30), wherein an opening (11) in the upper end of the inner support (10) forms a containing cavity used for containing an aerosol forming substrate (100), a through hole (12) in communication with the containing cavity is provided in the middle of the bottom end of the inner support (10), and an annular airflow cavity (70) is formed between an outer wall of the inner support (10) and an inner wall of the housing (200); the airflow separator (20) is sleeved on the inner support (10) and divides the airflow cavity (70) into a first annular airflow channel (71) and a second annular airflow channel (72) from outside to inside, the upper ends of the first airflow channel and the second airflow channel are in communication with each other, the lower end of the second airflow channel (72) is in communication with the through hole (12), and the first airflow channel (71) is in communication with an air inlet (203) provided in the housing (200); and the heat insulation base (30) is arranged at the lower end of the interior of the airflow separator (20) and used for fixing a heating body (300), and at least part of the heating body (300) extends into the containing cavity via the through hole (12) and is used for heating the aerosol forming substrate (100) contained in the containing cavity so as to generate aerosol.

Description

A kind of heat insulation structure and aerosol generating device

This application claims the priority of the Chinese patent application filed on December 01, 2020 with the application number 202011383396.4 and the invention titled "A thermal insulation structure and aerosol generating device", the entire contents of which are incorporated by reference in in this application.

technical field

The invention belongs to the technical field of aerosol devices, and in particular relates to a heat insulation structure and an aerosol generating device.

Background technique

The heat-not-burn aerosol generating device mainly uses a heating element to heat the aerosol generating substrate to several hundred degrees Celsius to release aerosol particles, and then carry out the aerosol through air transport. Such aerosol generating devices are often small in size, and the heat in the heating area is relatively concentrated, resulting in a large amount of heat being easily transferred to the outer shell of the heating area, so that the temperature of the outer shell in the heating area reaches above 45°C, which exceeds the comfortable temperature for the human body to hold, to a certain extent. It also causes energy loss. At the same time, when too much heat in the heating area is transferred to the battery and other components, it will cause certain safety hazards.

Application content

The purpose of the present application is to solve the deficiencies in the prior art at least to a certain extent, and to provide a thermal insulation structure and an aerosol generating device.

In order to achieve the above purpose, the embodiment of the present application provides a thermal insulation structure, which is applied in the casing of the aerosol generating device, including:

An inner support bracket, the upper end of the inner support bracket is opened to form a receiving cavity for accommodating the aerosol-forming matrix, the middle part of the bottom end of the inner support bracket is provided with a through hole that communicates with the receiving cavity, and the inner support bracket is An annular airflow cavity is formed between the outer wall and the inner wall of the casing;

The airflow divider is sleeved outside the inner support bracket and divides the airflow cavity into two annular first airflow passages and second airflow passages whose upper ends are connected to each other from the outside to the inside. The lower end of the second airflow channel is communicated with the through hole, and the first airflow channel is communicated with the air inlet opened on the housing;

an insulating base, which is arranged at the lower end of the interior of the airflow partition and is used for fixing the heating element, the heating element at least partially protrudes into the receiving cavity through the through hole, and is used for heating and accommodating The aerosol in the receiving cavity forms a matrix to generate an aerosol.

Preferably, it also includes a heat insulation element inner sleeve sleeved outside the inner support bracket, and the airflow cavity is formed between the inner wall of the heat insulation element inner sleeve and the outer wall of the inner support bracket.

Preferably, an annular vacuum heat insulating cavity is formed between the outer shell and the inner sleeve of the heat insulating element.

Preferably, an annular heat insulating element is also sleeved between the outer shell and the inner sleeve of the heat insulating element.

Preferably, the insulating element is made of aerogel or insulating wool.

Preferably, the gap width of the second airflow channel is greater than the gap width of the first airflow channel, and the gap width of the second airflow channel gradually increases from top to bottom.

Preferably, the bottom end of the inner support bracket is further provided with a plurality of communication holes on the side of the through hole, which communicate with the receiving cavity and the second airflow channel.

Preferably, a plurality of the communication holes are evenly distributed on the circumference of the bottom end of the inner support bracket.

Preferably, it also includes a fixed support, a limit ring is radially protruded on the inner wall of the airflow partition, and the heat insulating base is arranged in the airflow partition and located under the limit ring, so The upper end of the fixed support extends into the lower end of the airflow partition and is connected by snaps and/or fasteners, so as to press the heat insulating base against the limiting ring.

The embodiments of the present application also provide an aerosol generating device, including the above-mentioned thermal insulation structure.

In the embodiment of the present application, the interior of the aerosol generating device is separated by the inner support bracket and the airflow partition to form an airflow channel, and the heat of the enclosure accessories is removed by the convective heat exchange of the airflow, so as to ensure the comfort of the user when holding, and at the same time This part of the heat is recovered to be used for secondary heating of the aerosol-forming substrate, thereby improving the utilization rate of energy.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and do not limit the application.

Description of drawings

1 is a structural diagram of an aerosol generating device according to an embodiment of the present invention;

2 is a partial cross-sectional view of an aerosol generating device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of the inner support bracket in FIG. 2 .

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

Detailed ways

In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

It should be clear that the described embodiments are only a part of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

In a specific embodiment, the present application will be further described in detail below with reference to the accompanying drawings.

Referring to FIGS. 1 and 2 , an embodiment of the present application discloses an aerosol generating device, the aerosol generating device includes a casing 200 , a heating body 300 disposed in the casing 200 , a heat insulation structure, a control circuit board and The power supply, the heating body 300 is wrapped and fixed by the heat insulation structure, so that the heating body 300 is separated from the casing 200, the control circuit board and the power supply, and the heat generated by the heating body 300 is reduced by the heat insulation structure to the casing 200 and the power supply. The direction of the power supply is transmitted, and the control circuit board is electrically connected to the heating body 300 and the power supply respectively for controlling the operation of the heating body 300;

As shown in FIG. 2 , it is a partial cross-sectional view of the aerosol generating device. Specifically, the heat insulating structure disclosed in the embodiment of the present application includes an inner support bracket 10 , an air flow divider 20 and a heat insulation base 30 , and the upper end of the inner support bracket 10 is open. 11 forms a accommodating cavity for accommodating the aerosol forming matrix 100, a through hole 12 communicating with the accommodating cavity is opened in the middle of the bottom end of the inner support bracket 10, and an annular airflow is formed between the outer wall of the inner support bracket 10 and the inner wall of the outer shell 200. Cavity 70; the airflow divider 20 is sleeved outside the inner support bracket 10 and divides the airflow cavity 70 from outside to inside into two annular first airflow passages 71 and second airflow passages 72 whose upper ends are connected to each other, and the second airflow The lower end of the channel 72 is communicated with the through hole 12, and the first air flow channel 71 is communicated with the air inlet 203 opened on the casing 200; the heat insulating base 30 is arranged at the lower end of the interior of the air flow partition 20 for fixing the heating element 300, The heating element 300 extends into the receiving cavity at least partially through the through hole 12 , and is used for heating the aerosol-forming substrate 100 contained in the receiving cavity to generate aerosol.

The casing 200 of the aerosol generating device in this embodiment is divided into an upper casing 201 and a lower casing 202 that are detachably connected to each other, and the air inlet 203 is formed at the mutual matching gap between the upper and lower casings 202, at least two The shape of the air inlet 203 is set as a rectangle. In this way, when the upper case 201 is assembled on the lower case 202, the air inlet 203 can be installed to a certain extent. It is hidden to avoid the disposition of the air inlet 203 from affecting the overall appearance of the aerosol generating device. Both the control circuit board and the power supply are arranged inside the lower casing 202 .

When the user inhales the aerosol-forming substrate 100 , the air enters the aerosol-forming substrate from the air inlet 203 through the first airflow channel 71 and the second airflow channel 72 in sequence and through the through hole 12 at the bottom of the inner support bracket 10 , and enters the aerosol-forming substrate The inside of 100 is mixed with the generated aerosol for the user to inhale, and at the same time, the heat transferred from the heating element 300 to the upper casing 201 is effectively taken away through the convective heat exchange of the incoming airflow, which can effectively reduce the temperature of the upper casing 201. The temperature of the outer wall of the upper casing 201 is not too high to affect the user's comfort when holding, and the heat in the air flow channel is recovered to heat the aerosol forming substrate 100, thereby improving energy utilization.

The heat insulating base 30 is a ring-shaped structure, and an insulating substance for fixing the heating body 300 is filled and formed in the heat insulating base 30 . Specifically, the filling insulating material is preferably a glass glue filler, or other high-temperature-resistant filling materials, and the insulating base 30 is preferably a ceramic material, or other high-temperature-resistant insulating materials. In this way, the heat generated by the heating body 300 can be reduced to transmit to the control circuit board and the power supply in the lower casing 202 through the heat insulating base 30, so as to ensure the safe use of the aerosol generating device.

It should be noted that the interior of the heat insulating base 30 is provided with a limit hole extending to the upper end of the heat insulating base 30 and a accommodating cavity extending to the lower end of the heat insulating base 30 and larger than the limit hole, and the heating body 300 is on the side wall adjacent to the lower end The protrusion is provided with a limit protrusion. During assembly, the main body portion of the upper end of the heating element 300 can pass through the accommodating cavity and the limit hole in sequence until the limit protrusion is stopped by the edge of the limit hole, so that the limit protrusion And the part of the heating body 300 that is connected to the pins under the limiting protrusion is completely located in the accommodating cavity, so as to facilitate the rapid positioning between the heating body 300 and the heat insulating base 30, and then the accommodating cavity can be filled with insulation. Therefore, the heating body 300 and the heat insulating base 30 are fixed to each other, and this structure makes the assembly more convenient and quicker. The heating element 300 is electrically connected to the control circuit board through the connected pins.

In one embodiment, the upper shell 201 is further provided with a heat insulating element inner sleeve 40 sleeved outside the inner support bracket 10 , and an air flow cavity is formed between the inner wall of the heat insulating element inner sleeve 40 and the outer wall of the inner support bracket 10 70. In this way, a ring-shaped vacuum insulation cavity can be formed between the upper casing 201 and the inner sleeve 40 of the heat insulation element. Through the vacuum insulation cavity, the heat generated by the heating element 300 is further reduced to the outer wall of the upper casing 201 direction transfer. Of course, in this embodiment, a ring-shaped heat insulating element 50 can also be set between the upper casing 201 and the heat insulating element inner sleeve 40 to further isolate the heat transfer. For example, the heat insulating element 50 uses Made of aerogel or insulation cotton, preferably aerogel felt.

In the heat insulation structure of the embodiment of the present application, the above-mentioned inner support bracket 10 , the air flow divider 20 , the inner sleeve 40 of the heat insulation element and the heat insulation element together constitute the horizontal multi-layer heat insulation structure of this embodiment, that is, the inner support bracket 10 is used as the aerosol The carrier that forms the matrix 100 is the first lateral heat insulating layer through which the heat of the aerosol-forming matrix 100 leaks, and it can be made of a variety of heat insulating materials. In this embodiment, a polyetheretherketone (PEEK) material is preferably used. Its shape can be designed according to the aerosol-forming substrate 100 . The airflow divider 20 is used as the second lateral heat insulation layer, which can be made of metal material, so as to increase the heat exchange efficiency of the airflow. Of course, in other embodiments, the airflow divider 20 can also be made of heat reflective materials, films or coatings etc., to reduce the radiation of heat in the direction of the upper casing 201 . The thermal insulation element is filled between the thermal insulation element inner sleeve 40 and the upper casing 201 as a third lateral thermal insulation layer, and such a structure can prevent the material of the thermal insulation element 50 from being exposed. With the design of the airflow channel, the heat near the upper casing 201 can be directly taken away to the aerosol forming substrate 100 for recycling, which can effectively reduce the temperature of the outer wall of the upper casing 201 and improve the utilization rate of energy.

Preferably, the gap width of the first airflow channel 71 is 0.4mm, and the gap width of the second airflow channel 72 gradually increases from top to bottom, starting from 0.95mm at the uppermost end to 1.2mm at the lowermost end. In this way, the speed of the first air flow channel 71 is relatively large, which is beneficial to enhance the convective heat transfer capability, so as to take away more heat near the wall surface of the casing 200 . According to the actual test, when the temperature of the heating element 300 rises to about 250 ℃, the temperature of the casing 200 is up to 32 ℃, and when the temperature of the heating element 300 rises to about 300 ℃, the temperature of the casing 200 is up to 41 ℃. within the allowable temperature range.

In order to further improve the heat exchange efficiency between the airflow channel and the accommodating cavity, as shown in FIG. 3 , a plurality of communication holes 13 connecting the accommodating cavity and the second airflow channel 72 are formed at the bottom end of the inner bracket 10 on the side of the through hole. When the aerosol forming substrate 100 is inserted into the receiving cavity, each communication hole 13 exposes a part of the bottom wall and the outer wall of the aerosol forming substrate 100, so that the air can enter the interior of the aerosol forming substrate 100 more smoothly from the airflow channel. Preferably, the plurality of communication holes 13 are evenly distributed on the periphery of the bottom end of the inner support bracket 10, so that the user can better absorb the generated aerosol when inhaling, thereby improving the taste.

In one embodiment, the heat insulating structure of this embodiment further includes a fixed support 60 , a limiting ring 21 is radially protruded on the inner wall of the airflow partition member 20 , and the thermal insulation base 30 is disposed in the airflow partition member 20 and It is located under the limit ring 21, and the upper end is provided with an annular step 31 adapted to the limit ring 21; the upper end of the fixed support 60 extends into the lower end of the airflow divider 20 and passes through the buckle 61 and/or the fastener 62 connected to hold the heat insulating base 30 against the limiting ring 21 . At this time, the upper surface of the insulating base 30 is flush with the upper surface of the limiting ring 21 , so that there is only one space left between the heating element and the airflow partition 20 . The assembly gap avoids to the greatest extent possible that the oil remaining in the aerosol-forming substrate 100 leaks into the control circuit board and the power supply in the lower casing 202, thereby ensuring safe use.

That is to say, the thermal insulation base 30 and the fixed support 60 together form a vertical thermal insulation structure, the thermal insulation base 30 is used as the first vertical thermal insulation structure, and the fixed support 60 is used as the second vertical thermal insulation structure. It is made of high temperature resistant heat insulating material, preferably polyether ether ketone (PEEK) material; in this way, the contact thermal resistance between the heating body 300 and the lower casing 202 can be increased, and the thermal conduction thickness can also be increased, thereby reducing the heat transfer to the control circuit. The board and the power supply are transmitted to ensure the safety, reliability and comfort of the heat-not-burn aerosol generating device under working conditions.

It should be noted that a part of this patent application file contains content protected by copyright. Except for making copies of the patent files of the Patent Office or the contents of the recorded patent files, the copyright owner reserves the right to copyright.

Claims (10)

A thermal insulation structure, applied in the shell of an aerosol generating device, is characterized in that, comprising: An inner support bracket, the upper end of the inner support bracket is opened to form a receiving cavity for accommodating the aerosol-forming matrix, the middle part of the bottom end of the inner support bracket is provided with a through hole that communicates with the receiving cavity, and the inner support bracket is An annular airflow cavity is formed between the outer wall and the inner wall of the casing; The airflow divider is sleeved outside the inner support bracket and divides the airflow cavity into two annular first airflow passages and second airflow passages whose upper ends are connected to each other from the outside to the inside. The lower end of the second airflow channel is communicated with the through hole, and the first airflow channel is communicated with the air inlet opened on the housing; an insulating base, which is arranged at the lower end of the interior of the airflow partition and is used for fixing the heating element, the heating element at least partially protrudes into the receiving cavity through the through hole, and is used for heating and accommodating The aerosol in the receiving cavity forms a matrix to generate an aerosol. The thermal insulation structure according to claim 1, further comprising a thermal insulation element inner sleeve sleeved outside the inner support bracket, the inner wall of the thermal insulation element inner sleeve and the inner bracket bracket The airflow cavity is formed between the outer walls of the . The thermal insulation structure according to claim 2, wherein an annular vacuum thermal insulation cavity is formed between the outer shell and the inner sleeve of the thermal insulation element. The heat insulating structure according to claim 2, wherein an annular heat insulating element is also sleeved between the outer shell and the inner sleeve of the heat insulating element. The thermal insulation structure according to claim 4, wherein the thermal insulation element is made of aerogel or thermal insulation cotton. The thermal insulation structure according to claim 3, wherein the gap width of the second airflow channel is greater than the gap width of the first airflow channel, and the gap width of the second airflow channel gradually increases from top to bottom. The thermal insulation structure according to claim 1, wherein a plurality of communication holes connecting the accommodating cavity and the second airflow channel are further opened at the bottom end of the inner support bracket on the side of the through hole. The thermal insulation structure according to claim 6, wherein the plurality of communication holes are uniformly distributed on the periphery of the bottom end of the inner support bracket. The thermal insulation structure according to claim 1, further comprising a fixed support, a limit ring is radially protruded on the inner wall of the airflow partition, and the thermal insulation base is arranged on the airflow partition The upper end of the fixed support extends into the lower end of the air flow divider and is connected by snaps and/or fasteners, so as to hold the heat insulating base against the the limit ring. An aerosol generating device, characterized in that it comprises the heat insulating structure according to any one of claims 1 to 9.

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