Heating piece of electronic hookah
By designing the heating chamber and air passage of the electronic hookah heating element, the problem of uneven charcoal combustion is solved, achieving uniform heating and temperature stability of tobacco products, improving the taste of the smoke and reducing operational risks.
Patent Information
- Application Number
- CN202423245691.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-27
AI Technical Summary
The uneven burning of charcoal in existing hookahs leads to unstable temperatures, requiring manual addition or reduction of charcoal, and poses a risk of burns. Furthermore, the pollutants produced by charcoal combustion are harmful to the environment and human health.
It adopts an electronic hookah heating element, which evenly heats the tobacco product through the first heating element in the heating chamber, and preheats the external air through the air guide channel. The thermally conductive insulation layer ensures effective heat conduction and safe use, avoiding temperature fluctuations.
It achieves uniform heating of tobacco products, improves the taste of smoke, avoids temperature fluctuations and the risk of burns, reduces environmental pollution, and simplifies the operation process.
Smart Images
Figure CN223929487U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of Arabic hookah technology, and in particular to a heating element for an electronic hookah. Background Technology
[0002] Hookah is a form of smoking tobacco products, typically consisting of tobacco paste or tobacco leaves, that are filtered through a special tool called a "hookah." The smoking process usually involves lighting the charcoal, which produces carbon monoxide and a large amount of ash, polluting the air and posing a health risk when inhaled. Furthermore, the carbonization and combustion of charcoal during production releases smoke that significantly harms surrounding vegetation and people's lives.
[0003] Currently, during the combustion of tobacco products using charcoal, the volume of charcoal decreases as the combustion time increases, leading to uneven heating of the tobacco products. This often requires manual addition or reduction of charcoal to ensure the combustion quality of the tobacco products and the taste of the smoke. However, the manual addition or reduction of charcoal is a complex process and can easily cause burns to the operator's hands. Therefore, it is necessary to improve this process. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a heating element for an electronic hookah. The first heating element within the heating chamber generates heat and transfers it to the base, thereby evenly heating the tobacco product inside the bowl and ensuring the combustion quality of the tobacco. To prevent the influence of external cold air on the temperature inside the bowl, an air guide channel preheats the external air before it enters the bowl, avoiding temperature fluctuations caused by cold air directly entering the bowl and ensuring a stable temperature inside the bowl. This, in turn, improves the taste of the smoke produced after smoking the heated tobacco. Simultaneously, the application of a first thermally conductive insulating layer ensures effective heat conduction and safe use.
[0005] To achieve the above objectives, the present invention provides a heating element for an electronic hookah, comprising a base, a cover, and a first heating element.
[0006] The base is provided over the top opening of the tobacco bowl, and a heating chamber is provided inside the base;
[0007] The cover is detachably connected to the seat and is used to seal the heating chamber;
[0008] Both the base or the cover and the base are provided with a through-hole for allowing external air to enter the smoke bowl.
[0009] The first heating element is disposed in the heating cavity, and the first heating element or the cover and the seat are all provided with a first thermally conductive insulating layer.
[0010] Preferably, the cover is provided with a heat insulation layer, which is disposed inside the cover, at the upper end of the cover, or at the lower end of the cover.
[0011] Preferably, the base or the cover is provided with an extension ring in the radial direction, and the extension ring abuts against the top of the tobacco bowl.
[0012] Preferably, the cover body is provided with a first limiting part and a second limiting part at one end facing the base body.
[0013] The first limiting part abuts against the top of the seat body;
[0014] The second limiting part abuts against the inner wall of the heating chamber.
[0015] Preferably, the first thermally conductive insulating layer includes a first insulating layer and a first thermally conductive layer. The first insulating layer is disposed at the upper and lower ends of the first heating element, and the first thermally conductive layer is disposed on the side of the first heating element closer to the tobacco bowl.
[0016] Preferably, the first thermally conductive insulating layer is a first metal oxide layer, which is respectively disposed on the inner wall of the heating cavity and the inner side of the cover.
[0017] Preferably, the cover is provided with a heat dissipation component for dissipating heat from the first heating element.
[0018] The heat sink is detachably connected to the cover.
[0019] Preferably, the heat sink is provided with a second heating element, which is disposed at the top or bottom of the heat sink.
[0020] Preferably, the upper and lower ends of the second heating element, or the portion of the cover that contacts the second heating element, and the portion of the heat dissipation element that contacts the second heating element are all provided with a second thermally conductive insulating layer.
[0021] Preferably, the second thermally conductive insulating layer includes a second insulating layer and a second thermally conductive layer, which are sequentially disposed at the upper and lower ends of the second heating element.
[0022] Preferably, the first thermally conductive insulating layer is a second metal oxide layer, and the second metal oxide layer is respectively disposed on the portion of the cover that contacts the second heating element and the portion of the heat dissipation element that contacts the second heating element.
[0023] Preferably, the heat sink includes a first heat sink and a second heat sink, the second heat sink being stacked on top of the first heat sink, and the second heating element being disposed on the top or bottom of the first heat sink.
[0024] Preferably, both the second heat sink and the cover are provided with protrusions, and the upper and lower ends of the first heat sink are provided with recesses, and the protrusions are connected to the recesses.
[0025] The beneficial effects of this invention are as follows: The first heating element inside the heating chamber generates heat and transfers it to the base, thereby evenly heating the tobacco product inside the tobacco bowl and ensuring the combustion quality of the tobacco product. To avoid the influence of external cold air on the temperature inside the tobacco bowl, an air guide channel is used to preheat the external air before it enters the tobacco bowl, avoiding temperature fluctuations caused by cold air directly entering the tobacco bowl and ensuring a stable temperature inside the tobacco bowl. This, in turn, improves the taste of the smoke produced after smoking the heated tobacco product. Simultaneously, the application of the first thermally conductive insulating layer ensures effective heat conduction and safe use. Attached Figure Description
[0026] Figure 1 This is a cross-sectional structural diagram of the present invention.
[0027] Figure 2 This is a schematic diagram of the exploded structure of this utility model.
[0028] Figure 3 This is a cross-sectional view of the heat sink component of this utility model.
[0029] Figure 4 This is a cross-sectional view of the second heating element of this utility model.
[0030] The reference numerals in the figures include:
[0031] 1. Seat; 11. Heating cavity; 2. Cover; 21. Insulation layer; 22. Extension ring; 23. First limiting part; 24. Second limiting part; 3. First heating element; 4. Air guide channel; 5. First thermally conductive insulating layer; 51. First insulating layer; 52. First thermally conductive layer; 6. Heat dissipation element; 61. Second heating element; 62. First heat dissipation body; 63. Second heat dissipation body; 64. Recessed part; 7. Second thermally conductive insulating layer; 71. Second insulating layer; 72. Second thermally conductive layer; 8. Protrusion. Detailed Implementation
[0032] The present invention will now be described in detail with reference to the accompanying drawings.
[0033] like Figures 1 to 4 As shown, the heating element of an electronic hookah according to this utility model includes a base 1, a cover 2, and a first heating element 3.
[0034] The seat 1 covers the top opening of the tobacco bowl. The seat 1 has a heating chamber 11 inside. The first heating element 3 is located in the heating chamber 11. The tobacco product is heated in the heating chamber 11 by the first heating element 3, rather than directly heated. This indirect heating method helps to heat the tobacco more evenly and avoid local overheating, thereby protecting the structure and taste of the tobacco product.
[0035] The cover 2 is detachably connected to the base 1 and is used to seal the heating chamber 11. The modular design of the cover 2 and the base 1 allows users to easily clean and maintain the device, and also facilitates the replacement of damaged parts.
[0036] Both the base 1 and the cover 2 are permeated with air channels 4 that allow external air to enter the tobacco bowl. These air channels 4 preheat the external air before it enters the bowl. This avoids temperature fluctuations caused by cold air directly entering the bowl, ensuring a stable temperature inside the bowl and thus improving the flavor of the smoke produced after heating the tobacco product. It eliminates the need for manual charring to ensure the combustion quality of the tobacco product and the flavor of the smoke, reducing the risk of burns to the operator's hands.
[0037] The first heating element 3 or cover 2 and the base 1 are both provided with a first thermally conductive insulating layer 5. The provision of the first thermally conductive insulating layer 5 not only ensures the safe use of the first heating element 3, but also guides the heat to be conducted in a preset direction, reducing heat loss and improving the efficiency of heat use.
[0038] In use, the first heating element 3 inside the heating chamber 11 generates heat and transfers it to the base 1, thereby evenly heating the tobacco product inside the bowl and ensuring the combustion quality of the tobacco product. To avoid the influence of external cold air on the temperature inside the bowl, the air is preheated through the air guide channel 4 before entering the bowl, avoiding temperature fluctuations caused by cold air directly entering the bowl and ensuring a stable temperature inside the bowl, thus improving the taste of the smoke produced after smoking the heated tobacco product. At the same time, the application of the first thermally conductive insulation layer 5 ensures effective heat conduction and safe use.
[0039] The first heating element 3 is a resistance heating element, an electric heating tube, a PTC heating element, or a far-infrared heating element.
[0040] Resistance heating elements, such as resistance wires, resistance strips, or resistance sheets made of nickel-chromium alloys, iron-chromium-aluminum alloys, or non-metals (such as carbon).
[0041] The heating element of an electric heating tube can be a resistance wire, an electric heating alloy, or a ceramic heating element, etc.
[0042] In this embodiment, the first heating element 3 is used as an example of a resistance heating element.
[0043] Preferably, the first thermally conductive insulating layer 5 is an insulating ceramic, which can achieve insulation without affecting heat transfer. In other embodiments, the first thermally conductive insulating layer 5 can be a mica sheet, quartz, or ceramic material (alumina, aluminum nitride).
[0044] Specifically, the connection between the cover 2 and the base 1 can be either bolted or threaded.
[0045] When the cover 2 is bolted to the base 1, the cover 2 and the base 1 are respectively provided with corresponding bolt holes, and the two are fastened together by bolts and nuts.
[0046] When the cover 2 is threadedly connected to the base 1, the edge of the cover 2 is provided with external threads, and the base 1 is provided with a corresponding internal thread hole. By rotating the cover 2, the external threads and internal threads are tightly fitted, thereby realizing the connection between the cover 2 and the base 1.
[0047] like Figure 2 As shown, in another embodiment, the cover 2 is provided with a heat insulation layer 21, which is disposed inside the cover 2, at the upper end of the cover 2, or at the lower end of the cover 2.
[0048] The insulation layer 21 can effectively isolate the heat conducted from the first heating element 3 to the heating cavity 11, ensuring that the heat is conducted in the preset direction, thereby improving the heat utilization efficiency and reducing unnecessary heat loss.
[0049] On the other hand, the temperature of the cover 2 is significantly reduced due to the insulation layer 21. This not only allows users to pick up the heating element more safely and conveniently through the cover 2, but also reduces the potential risk of injury caused by accidental contact with the hot cover 2.
[0050] Preferably, the insulating layer is made of insulating ceramic, which can achieve insulation without affecting heat transfer. In other embodiments, the insulating layer may also be made of mica sheet, quartz, or ceramic materials (alumina, aluminum nitride).
[0051] like Figure 1 and Figure 2 As shown, in another embodiment, the base 1 or cover 2 is provided with an extension ring 22 in the radial direction, and the extension ring 22 abuts against the top of the tobacco bowl.
[0052] By providing an extension ring 22 radially on the base 1 or the cover 2, which abuts against the top of the tobacco bowl, the connection stability between the base 1, the cover 2, and the tobacco bowl is enhanced. This design helps prevent parts from loosening or falling off due to external forces such as drops or collisions during use, thus improving the product's durability and reliability.
[0053] The contact between the extension ring 22 and the top of the smoke bowl also serves as a seal, helping to prevent smoke, heat, or liquid from leaking from the connection. This is crucial for maintaining a stable environment within the heating chamber 11, preventing the entry of external impurities, and improving the overall performance of the product.
[0054] like Figure 1 As shown, in another embodiment, the end of the cover 2 facing the base 1 is provided with a first limiting part 23 and a second limiting part 24.
[0055] The first limiting part 23 abuts against the top of the seat 1;
[0056] The second limiting part 24 abuts against the inner wall of the heating chamber 11.
[0057] The contact between the first limiting part 23 and the top of the base 1 ensures the stable installation of the cover 2 on the base 1, preventing shaking or falling off during use and improving the overall structural stability.
[0058] The first limiting part 23 and the second limiting part 24 provide a clear installation position for the cover 2, ensuring accurate alignment between the cover 2 and the base 1 and avoiding installation errors.
[0059] The contact between the second limiting part 24 and the inner wall of the heating chamber 11 may also serve as a seal, preventing heat leakage from the heating chamber 11 and improving heating efficiency and safety.
[0060] like Figure 2 As shown, in another embodiment, the first thermally conductive insulating layer 5 includes a first insulating layer 51 and a first thermally conductive layer 52. The first insulating layer 51 is disposed at the upper and lower ends of the first heating element 3, and the first thermally conductive layer 52 is disposed on the side of the first heating element 3 near the tobacco bowl, so that the first thermally conductive layer 52, the first insulating layer 51, the first heating element 3 and the first insulating layer 52 are arranged sequentially.
[0061] The first insulating layer 51 effectively isolates the first heating element 3 from the external environment, preventing current from being directly conducted to users or other components that may come into contact with it, thereby greatly improving the safety of the product.
[0062] The first heat-conducting layer 52 is located between the first heating element 3 and the smoke pot, which can quickly transfer the heat generated by the heating element to the smoke pot, improve the heat transfer efficiency, and make the heating more uniform and rapid.
[0063] Preferably, the first insulating layer 51 is an insulating ceramic, which can achieve insulation without affecting heat transfer. In other embodiments, the first insulating layer 51 can be a mica sheet, quartz, or ceramic material (alumina, aluminum nitride).
[0064] The first thermally conductive layer 52 is thermally conductive silicone grease. In other embodiments, the first thermally conductive layer 52 can also be a ceramic material (such as alumina, aluminum nitride), a carbon-based material (such as graphite, graphene, carbon fiber), a polymer composite material, etc., so that the heat of the first thermally conductive layer 52 can be transferred evenly.
[0065] In another embodiment, the first thermally conductive insulating layer 5 is a first metal oxide layer, which is respectively disposed on the inner wall of the heating cavity 11 and the inner side of the cover 2.
[0066] The first metal oxide layer has good thermal conductivity, which can quickly transfer heat from the heat source to the area that needs to be heated, thus improving heating efficiency.
[0067] The first metal oxide layer, as an insulating layer, can effectively isolate current and prevent current from passing directly through the heating cavity 11 or the cover 2, thus ensuring the electrical safety of the product.
[0068] Specifically, the first metal oxide layer can be aluminum oxide, titanium oxide, zinc oxide, or aluminum nitride. Preferably, in this embodiment, the first metal oxide layer is aluminum oxide.
[0069] like Figure 1 and Figure 3 As shown, in another embodiment, the cover 2 is provided with a heat dissipation element 6 for dissipating heat from the first heating element 3. The heat dissipation element 6 is a heat sink, which is usually made of metal (such as aluminum, copper or alloy) and has a large surface area to accelerate heat dissipation.
[0070] The heat sink 6 is detachably connected to the cover 2.
[0071] The specific connection methods between the heat sink 6 and the cover 2 are as follows:
[0072] The heat sink 6 and the cover 2 are respectively provided with corresponding bolt holes, and the two are fastened together by bolts and nuts.
[0073] The heat sink 6 and the cover 2 are respectively provided with threaded holes and threaded posts.
[0074] In other embodiments, the heat sink 6 and the cover 2 can also be integrally formed so that the heat sink 6 and the cover 2 are firmly connected.
[0075] By setting the heat dissipation component 6, the heat generated by the first heating component 3 can be more effectively diffused to the outer periphery, so that the cold air outside is preheated before entering the air guide channel 4.
[0076] like Figure 3 As shown, in another embodiment, the heat sink 6 is provided with a second heating element 61, which is disposed at the top or bottom of the heat sink 6.
[0077] By providing a second heating element 61 on the heat sink 6, the heat distribution can be further improved. The combination of the second heating element 61 and the heat sink 6 allows heat to be transferred more evenly to the entire heat dissipation area, improving heating efficiency and heat utilization, and enhancing the preheating effect of external cold air.
[0078] The second heating element 61 can be a resistance heating element, an electric heating tube, a PTC heating element, or a far-infrared heating element.
[0079] Resistance heating elements, such as resistance wires, resistance strips, or resistance sheets made of nickel-chromium alloys, iron-chromium-aluminum alloys, or non-metals (such as carbon).
[0080] The heating element of an electric heating tube can be a resistance wire, an electric heating alloy, or a ceramic heating element, etc.
[0081] In this embodiment, the second heating element 61 is exemplified by a resistance heating element.
[0082] like Figure 4 As shown, in another embodiment, the upper and lower ends of the second heating element 61 or the portion of the cover 2 that contacts the second heating element 61 and the portion of the heat dissipation element 6 that contacts the second heating element 61 are all provided with a second thermally conductive insulating layer 7.
[0083] The second thermally conductive insulating layer 7 can effectively reduce heat loss at the interfaces of the upper and lower ends of the second heating element 61, the parts in contact with the second heating element 61, and the parts in contact with the heat dissipation element 6, thereby improving the thermal efficiency of the entire heating element.
[0084] In this embodiment, the second thermally conductive insulating layer 7 is an insulating ceramic, which can achieve insulation without affecting heat transfer. In other embodiments, the second thermally conductive insulating layer 7 can be a mica sheet, quartz, or ceramic material (alumina, aluminum nitride).
[0085] like Figure 4 As shown, in another embodiment, the second thermally conductive insulating layer 7 includes a second insulating layer 71 and a second thermally conductive layer 72, which are sequentially disposed at the upper and lower ends of the second heating element 61.
[0086] The second insulation layer 71 directly covers the upper and lower ends of the second heating element 61, playing a role in electrical insulation, effectively preventing current leakage and short circuit risks, and improving the safety of the equipment.
[0087] The second heat-conducting layer 72 is in close contact with the second insulating layer 71, which can quickly transfer the heat generated by the second heating element 61, reduce the accumulation of heat around the heating element, and improve thermal efficiency.
[0088] The second insulating layer 71 is made of insulating ceramic, which can achieve insulation without affecting heat transfer. In other embodiments, the second insulating layer 71 can be mica sheet, quartz, or ceramic materials (alumina, aluminum nitride).
[0089] The second thermal conductive layer 72 is thermally conductive silicone grease. In other embodiments, the second thermal conductive layer 72 can also be a ceramic material (such as alumina, aluminum nitride), a carbon-based material (such as graphite, graphene, carbon fiber), a polymer composite material, etc., so that the heat of the second thermal conductive layer 72 can be transferred evenly.
[0090] In another embodiment, the first thermally conductive insulating layer 5 is a second metal oxide layer, which is respectively disposed on the portion of the cover 2 in contact with the second heating element 61 and the portion of the heat dissipation element 6 in contact with the second heating element 61.
[0091] The second metal oxide layer, as a thermally conductive and insulating layer, can quickly transfer the heat generated by the second heating element 61 to the cover 2 and the heat dissipation element 6, while maintaining electrical isolation, preventing current leakage, and ensuring the safety of the equipment.
[0092] Specifically, the second metal oxide layer can be aluminum oxide, titanium oxide, zinc oxide, or aluminum nitride. Preferably, in this embodiment, the second metal oxide layer is aluminum oxide.
[0093] like Figure 3 As shown, in another embodiment, the heat sink 6 includes a first heat sink 62 and a second heat sink 63, the second heat sink 63 is stacked on top of the first heat sink 62, and the second heating element 61 is disposed on the top or bottom of the first heat sink 62.
[0094] By stacking the second heat sink 63 on top of the first heat sink 62, the heat dissipation area is increased, thereby improving the heat dissipation efficiency.
[0095] The second heating element 61 can be located at the top or bottom of the first heat sink 62. This design provides greater flexibility, allowing the heat dissipation structure to be customized and optimized according to the actual application scenario.
[0096] like Figure 3 As shown, in another embodiment, both the second heat sink 63 and the cover 2 are provided with protrusions 8, and the upper and lower ends of the first heat sink 62 are provided with recesses 64, with the protrusions 8 connected to the recesses 64.
[0097] The connection design between the protrusion 8 and the recess 64 enhances the connection strength between the first heat sink 62 and the second heat sink 63, as well as between the first heat sink 62 and the cover 2, making the entire structure more stable and able to resist external impacts and vibrations, ensuring the stable operation of the equipment.
[0098] The connection between the protrusion 8 and the recess 64 increases the heat dissipation area, which helps heat to be transferred more effectively from the first heat sink 62 to the second heat sink 63 and finally dissipated into the environment. This design improves heat dissipation efficiency.
[0099] The design of the protrusion 8 and the recess 64 may make the assembly process of the heat sink 6 and the cover 2 simpler and faster. It reduces the alignment and fixing steps in the assembly process, lowers manufacturing costs, and improves production efficiency.
[0100] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. A heating element for an electronic hookah, characterized in that, It includes a base (1), a cover (2), and a first heating element (3). The seat (1) covers the top opening of the tobacco bowl, and a heating chamber (11) is provided inside the seat (1). The cover (2) is detachably connected to the seat (1) and is used to seal the heating chamber (11). Both the base (1) and the cover (2) are provided with an air guide channel (4) that allows external air to enter the tobacco bowl. The first heating element (3) is disposed in the heating cavity (11), and the first heating element (3) or the cover (2) and the seat (1) are all provided with a first thermally conductive insulating layer (5).
2. The heating element of an electronic hookah according to claim 1, characterized in that, The cover (2) is provided with a heat insulation layer (21), which is located inside the cover (2), at the upper end of the cover (2), or at the lower end of the cover (2).
3. The heating element of an electronic hookah according to claim 1, characterized in that, The seat (1) or the cover (2) is provided with an extension ring (22) in the radial direction, and the extension ring (22) abuts against the top of the tobacco bowl.
4. The heating element of an electronic hookah according to any one of claims 1-3, characterized in that, The cover (2) is provided with a first limiting part (23) and a second limiting part (24) at one end facing the seat (1). The first limiting part (23) abuts against the top of the seat (1); The second limiting part (24) abuts against the inner wall of the heating chamber (11).
5. The heating element of an electronic hookah according to claim 1, characterized in that, The first thermally conductive insulating layer (5) includes a first insulating layer (51) and a first thermally conductive layer (52). The first insulating layer (51) is disposed at the upper and lower ends of the first heating element (3), and the first thermally conductive layer (52) is disposed on the side of the first heating element (3) near the tobacco pot.
6. The heating element of an electronic hookah according to claim 1, characterized in that, The first thermally conductive insulating layer (5) is a first metal oxide layer, which is respectively disposed on the inner wall of the heating cavity (11) and the inner side of the cover (2).
7. The heating element of an electronic hookah according to claim 1, characterized in that, The cover (2) is provided with a heat dissipation component (6) for dissipating the heat of the first heating element (3). The heat sink (6) is detachably connected to the cover (2).
8. The heating element of an electronic hookah according to claim 7, characterized in that, The heat sink (6) is provided with a second heating element (61), which is located at the top or bottom of the heat sink (6).
9. The heating element of an electronic hookah according to claim 8, characterized in that, The upper and lower ends of the second heating element (61) or the part of the cover (2) that contacts the second heating element (61) and the part of the heat dissipation element (6) that contacts the second heating element (61) are provided with a second thermally conductive insulating layer (7).
10. The heating element of an electronic hookah according to claim 9, characterized in that, The second thermally conductive insulating layer (7) includes a second insulating layer (71) and a second thermally conductive layer (72), which are sequentially disposed at the upper and lower ends of the second heating element (61).
11. The heating element of an electronic hookah according to claim 9, characterized in that, The first thermally conductive insulating layer (5) is a second metal oxide layer, which is respectively disposed on the part of the cover (2) in contact with the second heating element (61) and the part of the heat dissipation element (6) in contact with the second heating element (61).
12. The heating element of an electronic hookah according to claim 8, characterized in that, The heat sink (6) includes a first heat sink (62) and a second heat sink (63), the second heat sink (63) being stacked on top of the first heat sink (62), and the second heating element (61) being disposed on the top or bottom of the first heat sink (62).
13. The heating element of an electronic hookah according to claim 12, characterized in that, The second heat sink (63) and the cover (2) are both provided with protrusions (8), and the upper and lower ends of the first heat sink (62) are both provided with recesses (64), and the protrusions (8) are connected to the recesses (64).