Incense stick

Abstract

The utility model provides an incense stick which can reduce the infiltration time of essential oil during production and can uniformly release fragrance during use. The incense rod is used for the fragrance device, the incense rod is in a long strip shape extending in the first direction, the incense rod comprises a plurality of layer parts which are separated from one another, and the plurality of layer parts are connected with one another in the second direction orthogonal to the first direction.

Description

Technical Field

[0001] The utility model relates to a fragrance stick, in particular to a fragrance stick used in a fragrance device. Background Art

[0002] At present, fragrance devices are widely used in vehicles. In such fragrance devices, as shown in Patent Document 1, cylindrical integrated fragrance sticks are mostly used. The fragrance stick is used as a carrier of essential oil, and the fragrance stick itself does not have fragrance. During production, the fragrance stick needs to be soaked in the essential oil so that the fragrance stick absorbs the essential oil and then installed in the fragrance device for use.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Chinese Utility Model Patent CN210309851U

[0006] Since the incense stick absorbs the essential oil by diffusing from the outer surface to the inner surface, and when it is full, the essential oil will show a gradient trend of gradually decreasing from the outer surface to the center, therefore, in the integrated incense stick structure such as Patent Document 1, due to its thick thickness, it takes a long time for the essential oil to diffuse from the outer surface to the center, and the productivity is poor.

[0007] Moreover, due to the existence of the above-mentioned gradient trend, when the incense stick is immersed in the essential oil for a short time, the essential oil absorbed by the material in the center is far less than the upper limit that the actual material can absorb. Since the absorption of essential oil is positively correlated with the usable time of the incense stick, when the incense stick is used, the insufficient absorption of essential oil by the material in the center also leads to the insufficient life of the incense stick.

[0008] In addition, when using the fragrance device, users hope that the fragrance can always be in a relatively constant comfortable concentration. However, the integrated incense stick structure such as Patent Document 1 has the problem of too strong initial fragrance during use, and then becomes lighter and lighter over time. This is because, in order to maximize the service life of the incense stick, during production, the incense stick is always made to absorb as much essential oil of the highest concentration as possible, resulting in the surface of the incense stick being almost full of high-concentration essential oil. During the use of the incense stick, the essential oil on the surface will first be released outward, and then the essential oil inside will gradually diffuse to the surface of the incense stick, and then released through the surface. In this case, during the initial use, the high-concentration essential oil is released quickly, resulting in an excessively high initial concentration, which causes the user to feel uncomfortable. In addition, as time goes by, the amount of essential oil on the surface of the incense stick shows a downward trend, so that at the end of the service life of the incense stick, the fragrance concentration felt by the user drops sharply compared to the initial use, which will also cause user dissatisfaction. Utility Model Content

[0009] The utility model is made to solve the above-mentioned problem, and its purpose is to provide a fragrance stick which can reduce the soaking time of essential oil during production and release fragrance evenly during use.

[0010] In order to solve the above technical problems, an incense stick of one embodiment of the utility model is used for a fragrance device, wherein the incense stick is in the shape of an elongated strip extending along a first direction, and the incense stick includes a plurality of layer parts separated from each other, and the plurality of layer parts are connected to each other in a second direction orthogonal to the first direction.

[0011] According to such a structure, the thickness of each layer can be reduced. Therefore, when each layer is immersed in the essential oil, the contact surface area between the material of the same volume and the essential oil increases, so the essential oil can be immersed faster, reducing the infiltration time and improving productivity. In addition, since multiple layers can be immersed in the essential oil separately, the influence of the gradient trend of the essential oil gradually decreasing from the outer surface to the center on the uniformity of the essential oil retained by each layer can be reduced. As a result, under the same infiltration time, the essential oil retained by the entire incense stick composed of each layer is roughly uniform from the outside to the inside, so the problem of the fragrance concentration changing drastically over time can be alleviated, thereby improving the user satisfaction of the incense stick.

[0012] In the above embodiment, preferably, the plurality of layer portions include at least one cylindrical surrounding portion and at least one columnar inner layer portion, and at least a portion of the inner layer portion is covered by the surrounding portion.

[0013] According to such a structure, since it has an inner and outer layered structure, during the processing, the inner layer part and the surrounding part can be soaked in essential oils of different concentrations, or the inner layer part and the surrounding part can be made of materials with different adsorption rates. Therefore, the problem of too high initial concentration can be avoided during use, so that the fragrance is always at a relatively constant and comfortable concentration. In addition, the structure is simple and easy to manufacture.

[0014] In the above embodiment, preferably, the multiple layer parts include a cylindrical surrounding part and a cylindrical inner layer part, and the inner layer part is composed of a large diameter part and a small diameter part, the diameter of the large diameter part is the same as the outer diameter of the surrounding part, and the diameter of the small diameter part is the same as the inner diameter of the surrounding part.

[0015] According to such a structure, the surrounding part and the inner layer part are fixed by the friction between each other, and the two fit tightly with almost no gap, which can reduce the volatilization of essential oil from the gap during the use of the incense stick. In addition, since the inner layer part has a large diameter part, when assembling the incense stick by a robot, etc., it is only necessary to hold the large diameter part and insert the surrounding part. Compared with the case without a large diameter part, the process of the robot pushing the bottom of the inner layer part can be saved, thereby improving production efficiency.

[0016] In the above embodiment, preferably, the surrounding portion is in the shape of a bottomed cylinder with one end away from the large diameter portion being closed.

[0017] According to such a structure, the inner layer part can be isolated from the outside through the bottom surface, preventing the essential oil in the inner layer part from directly contacting the air. Thus, the essential oil in the inner layer part can be made to slowly penetrate into the surrounding part, thereby increasing the service life of the incense stick.

[0018] In the above embodiment, preferably, the inner layer part also has a step portion, which is located between the large diameter portion and the small diameter portion, and the diameter of the step portion is smaller than the diameter of the large diameter portion and larger than the diameter of the small diameter portion, and the surrounding part is provided with an expanded diameter portion whose inner diameter is the same as the diameter of the step portion, and when the inner layer part is inserted into the surrounding part, the step portion engages with the expanded diameter portion.

[0019] According to such a structure, the strength of the inner layer portion is improved, and the inner layer portion is prevented from being broken, and the bonding strength between the surrounding portion and the inner layer portion is further improved.

[0020] In the above embodiment, preferably, both the surrounding portion and the inner layer portion are made of porous ceramics.

[0021] According to such a structure, since the porous ceramic surface has a large roughness, the inner layer part can be fixed to the surrounding part by the friction force of the contact surface after being inserted and assembled, without the need for other fixing structures. In addition, compared with the case of using ordinary materials, the porous ceramic has a greater friction force, which can make the combination of the inner layer part and the surrounding part more firm.

[0022] In the above embodiment, preferably, the ceramic porosity of the surrounding portion is smaller than the ceramic porosity of the inner layer portion.

[0023] According to such a structure, the ceramic porosity of the surrounding part is reduced compared to the inner part, which is equivalent to reducing the surface area of ​​the essential oil released outward, thereby reducing the amount of essential oil released per unit time, thereby improving the problem of excessive initial concentration. The ceramic porosity of the inner part is relatively high, so when the inner part is immersed in the essential oil, the infiltration speed of the essential oil is accelerated by the larger ceramic porosity. In addition, since the inner part is wrapped by the surrounding part during use, even if the ceramic porosity is relatively large, the essential oil retained therein will not evaporate into the air too quickly, so that the service life of the incense stick will not be reduced. In addition, the larger ceramic porosity of the inner part can make the inner part absorb more essential oil, which can actually increase the service life of the incense stick.

[0024] In the above embodiment, preferably, the concentration of the essential oil retained by the surrounding portion is lower than the concentration of the essential oil retained by the inner layer portion.

[0025] According to such a structure, even when the ceramic porosity of the surrounding part and the inner part is the same, the concentration of the essential oil retained in the surrounding part is reduced compared to the inner part, so the concentration perceived by the initial user can be reduced, thereby improving the problem of excessive initial fragrance concentration.

[0026] In order to solve the above technical problems, another embodiment of the incense stick of the utility model is used for a fragrance device, wherein the incense stick is integrally composed of a cylindrical surrounding part with one end open and the other end closed and a columnar inner part, the inner part and the surrounding part are connected at the closed end of the surrounding part, and there is a gap between the inner part and the surrounding part.

[0027] According to such a structure, after the incense stick is immersed in the essential oil, the contact surface area between the essential oil and the incense stick is increased due to the existence of the gap, so the essential oil can be infiltrated faster, reducing the infiltration time and improving productivity. In addition, since the surrounding part and the inner layer part are integrally formed, the essential oil can directly infiltrate the inner layer part through the gap, without the need for assembly after immersion, and the use process is simpler.

[0028] In the above embodiment, preferably, a cylindrical filling portion is further provided, and the filling portion is inserted into the gap between the inner layer portion and the surrounding portion and is in close contact with the inner layer portion and the surrounding portion.

[0029] According to such a structure, fixation is achieved through the friction between the two, so that a three-layer structure is realized through two components, which can reduce the volatilization rate of the essential oil and increase the contact area between the components, thereby preventing the filling part from falling out.

[0030] In the above embodiment, preferably, the inner layer part, the filling part and the surrounding part are composed of porous ceramics, the ceramic porosity of the inner layer part is the same as the ceramic porosity of the surrounding part, and the ceramic porosity of the filling part is greater than or equal to the ceramic porosity of the surrounding part.

[0031] According to such a structure, the ceramic porosity of the surrounding part is relatively low, which can reduce the surface area of ​​the essential oil released outward, thereby reducing the amount of essential oil released per unit time, thereby improving the problem of excessive initial concentration. The ceramic porosity of the filling part is relatively high, so when the filling part is immersed in the essential oil, the infiltration speed of the essential oil is accelerated by the larger ceramic porosity, and the amount of essential oil that can be absorbed in the end is increased, thereby improving the life of the incense stick. In addition, since the filling part is located between the inner layer part and the surrounding part, even if the ceramic porosity is relatively large, the essential oil it retains will not evaporate into the air too quickly, so that the service life of the incense stick will not be reduced. In addition, the ceramic porosity of the integrally formed inner layer part and the surrounding part is the same, which can simplify the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a perspective view showing an incense stick according to a first embodiment, wherein: Figure 1 (a) shows the state after the surrounding part and the inner part are decomposed. Figure 1 (b) shows the state after the surrounding part and the inner layer part are assembled.

[0033] Figure 2 It is a cross-sectional view showing the incense stick of the first embodiment.

[0034] Figure 3 is a perspective view showing an incense stick according to a second embodiment, wherein: Figure 3 (a) shows the state after the surrounding part, the inner part and the filling part are solved. Figure 3 (b) shows a state where the surrounding part, the inner layer part and the filling part are assembled.

[0035] Figure 4 It is a cross-sectional view showing an incense stick according to a second embodiment. DETAILED DESCRIPTION

[0036] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0037] (First Embodiment)

[0038] Reference Figure 1 , 2 , the first embodiment is described. Figure 1 (a) is a three-dimensional diagram showing a state where the surrounding part and the inner part of the incense stick are decomposed. Figure 1(b) is a three-dimensional view showing the state after the surrounding part and the inner layer part of the incense stick are assembled. Figure 2 It is a cross-sectional view showing a state where the surrounding portion and the inner layer portion are decomposed, and is a cross-sectional view obtained by cutting the incense stick along a plane including the axial direction of the incense stick.

[0039] like Figure 1 , 2 As shown, the incense stick 1 of this embodiment is cylindrical extending along a first direction X, and includes a cylindrical surrounding part 2 and a cylindrical inner layer part 3 which are separated from each other. After assembly, the surrounding part 2 and the inner layer part 3 are connected to each other in a second direction Y which is orthogonal to the first direction X.

[0040] The inner layer portion 3 is composed of a large diameter portion 31 and a small diameter portion 32, wherein the diameter of the large diameter portion 31 is the same as the outer diameter of the surrounding portion 2, and the diameter of the small diameter portion 32 is the same as the inner diameter of the surrounding portion 2. The inner layer portion 3 is further provided with a step portion 33, which is located between the large diameter portion 31 and the small diameter portion 32, and the diameter of the step portion 33 is smaller than the diameter of the large diameter portion 31 and larger than the diameter of the small diameter portion 32. The surrounding portion 2 is provided with an enlarged diameter portion 21 having an inner diameter the same as the diameter of the step portion.

[0041] like Figure 1 (b) and Figure 2 As shown, the surrounding part 2 is a bottomed cylindrical shape with one end away from the large diameter part 31 being closed. When the inner layer part 3 is inserted into the surrounding part 2, the step part 33 engages with the enlarged diameter part 21, so that the small diameter part 32 and the step part 33 are covered by the surrounding part 2.

[0042] In the present embodiment, both the surrounding portion 2 and the inner layer portion 3 are made of porous ceramics, and the ceramic porosity of the surrounding portion 2 is smaller than the ceramic porosity of the inner layer portion 3 .

[0043] Next, the effects of this embodiment will be described.

[0044] In this embodiment, the incense stick 1 is used as follows: the multiple layers of the split structure of the incense stick 1 are soaked in essential oil respectively, and assembled after soaking for a certain period of time; after assembly, it is installed in the fragrance device, so that the incense stick soaked in essential oil can release fragrance. Since the incense stick 1 has an inner and outer layered structure, and the surrounding part 2 and the inner layer part 3 are connected to each other in the second direction Y. Therefore, compared with the structure in which the entire incense stick is formed as an integral body as in the prior art, the thickness of each of the surrounding part 2 and the inner layer part 3 can be reduced, so that when the surrounding part 2 and the inner layer part 3 are soaked in essential oil respectively, the contact surface area with the essential oil is increased, which is equivalent to the same volume of material, so that the essential oil can be soaked faster, the soaking time is reduced, and the productivity of the incense stick 1 is improved.

[0045] In addition, since the surrounding portion 2 and the inner portion 3 can be soaked in the essential oil respectively, the influence of the gradient trend of the essential oil gradually decreasing from the outer surface to the center on the uniformity of the essential oil retained by the surrounding portion 2 and the inner portion 3 can be reduced. As a result, under the same soaking time, the essential oil retained by the entire incense stick 1 is roughly uniform from the outside to the inside, so the problem of a significant change in the fragrance concentration over time can be alleviated, thereby improving the user satisfaction of the incense stick.

[0046] Furthermore, due to the structure of inner and outer layers, during the processing, the surrounding part 2 and the inner layer part 3 can be soaked in essential oils of different concentrations, or the surrounding part 2 and the inner layer part 3 can be made of materials with different adsorption rates (such as the above-mentioned ceramic porosity). Therefore, the problem of too high initial concentration of essential oil can be avoided during use, so that the fragrance is always at a relatively constant and comfortable concentration. In addition, the structure is simple and easy to manufacture.

[0047] Moreover, the surrounding part 2 and the inner layer part 3 are fixed by the friction force between each other, and the two fit tightly with almost no gap, so that the volatilization of the essential oil from the gap can be reduced during the use of the incense stick 1.

[0048] In addition, since the inner layer part 3 has the large diameter part 31 and the small diameter part 32, when the incense stick 1 is assembled by a robot or the like, it is only necessary to hold the large diameter part 31 and insert the surrounding part 2. Compared with the case where the large diameter part 31 is not provided, the process of the robot pushing the bottom of the inner layer part 3 can be saved, thereby improving production efficiency. In this case, by forming the step part 33 and the expanded diameter part 21, the strength of the inner layer part 3 can be improved, and the inner layer part 3 can be prevented from being broken, thereby further improving the bonding strength between the surrounding part 2 and the inner layer part 3.

[0049] In addition, the surrounding part 2 and the inner layer part 3 are formed by porous ceramics. Since the surface of the porous ceramics has a large roughness, the inner layer part 3 can be fixed to each other by the friction of the contact surfaces after being inserted into the surrounding part 2 and assembled, without the need for other fixing structures. And compared with the case of using ordinary materials, the friction of porous ceramics is greater, which can make the combination of the inner layer part 3 and the surrounding part 2 more firmly. Moreover, in this case, compared with the inner layer 3, the ceramic porosity of the surrounding part 2 is reduced, which is equivalent to reducing the surface area of ​​the essential oil released outward, thereby reducing the amount of essential oil released per unit time, thereby improving the problem of excessive initial concentration. The ceramic porosity of the inner layer 3 is relatively high, so when the inner layer 3 is infiltrated with essential oil, the infiltration speed of the essential oil can be accelerated by the larger ceramic porosity, and the larger ceramic porosity of the inner layer 3 can make the inner layer 3 absorb more essential oil, which can actually increase the service life of the incense stick 1.

[0050] Furthermore, since the inner layer 3 is wrapped by the surrounding part 2 during use, even if the ceramic porosity of the inner layer 3 is relatively large, the essential oil retained therein will not evaporate into the air too quickly, thus not reducing the service life of the incense stick. Furthermore, since the surrounding part 2 is formed into a bottomed cylindrical shape, the inner layer 3 can be isolated from the outside through the bottom surface, preventing the essential oil in the inner layer 3 from directly contacting the air. Thus, the essential oil in the inner layer 3 can be made to penetrate slowly into the surrounding part 2, thereby increasing the service life of the incense stick 1.

[0051] (Second Embodiment)

[0052] Reference Figure 3 , 4 , the second embodiment is described. Figure 3 (a) is a stereoscopic diagram showing a state where the surrounding part, the inner layer part and the filling part are separated. Figure 3 (b) is a perspective view showing a state where the surrounding portion, the inner layer portion, and the filling portion are assembled. Figure 4 It is a cross-sectional view showing a state where the surrounding part, the inner layer part and the filling part are separated, and is a cross-sectional view obtained by cutting the incense stick along a plane including the axial direction of the incense stick.

[0053] In the first embodiment described above, the surrounding portion 2 and the inner layer portion 3 are formed separately. However, the surrounding portion 2 and the inner layer portion 3 may be formed integrally.

[0054] like Figure 3 , 4 As shown, the incense stick 1 of the second embodiment is integrally formed by a cylindrical surrounding part 2 with one end open and the other end closed and a columnar inner layer part 3, and the inner layer part 3 and the surrounding part 2 are connected at the closed end of the surrounding part 2. In addition, there is a gap between the inner layer part 3 and the surrounding part 2.

[0055] In this way, a multi-layered incense stick 1 can also be formed. After the incense stick 1 constructed in this way is immersed in the essential oil, the contact surface area between the essential oil and the incense stick increases due to the presence of the gap, so the essential oil can be infiltrated faster, reducing the infiltration time and improving productivity. In addition, since the surrounding part 2 and the inner layer part 3 are integrally formed, compared with the first embodiment, the essential oil can directly penetrate the inner layer part through the gap, and after infiltration, it can be directly installed in the fragrance device, so that the incense stick infiltrated with the essential oil can release the fragrance. There is no need to assemble after soaking, and the use process is simpler.

[0056] In order to further improve the service life of the incense stick 1, in this embodiment, it is preferred to further include a cylindrical filling portion 4, which is inserted into the gap between the inner layer portion 3 and the surrounding portion 2 and fits tightly with the inner layer portion 3 and the surrounding portion 2. In this way, the filling portion 4 is fixed by the friction between the inner layer portion 3 and the surrounding portion 2, and a three-layer structure is formed by two components, which can reduce the volatilization rate of the essential oil, and compared with the first embodiment, the contact area between the components is increased, which can prevent the filling portion 4 from falling out.

[0057] In this embodiment, the inner layer 3, the filling part 4 and the surrounding part 2 are also made of porous ceramics. In addition, the ceramic porosity of the inner layer 3 is the same as that of the surrounding part 2, and the ceramic porosity of the filling part 4 is greater than that of the surrounding part 2.

[0058] In this way, the ceramic porosity of the integrally formed inner layer 3 and the surrounding part 2 is the same, which can simplify the production process. In addition, since the ceramic porosity of the surrounding part 2 is low, the surface area for releasing the essential oil can be reduced, thereby reducing the amount of essential oil released per unit time, thereby improving the problem of excessive initial concentration.

[0059] In addition, the ceramic porosity of the filling part 4 is relatively high, so when the filling part 4 is soaked in essential oil, the infiltration speed of the essential oil can be accelerated by the greater ceramic porosity, and the amount of essential oil that can be absorbed is increased, thereby increasing the life of the incense stick. In addition, since the filling part 4 is located between the inner layer part 3 and the surrounding part 2, even if the ceramic porosity is relatively large, the essential oil retained therein will not evaporate into the air too quickly, so that the service life of the incense stick will not be reduced.

[0060] (Other embodiments)

[0061] As mentioned above, although the preferred embodiment of the present invention was described, the present invention is not limited to the above-mentioned embodiment, and various changes and combinations can be made without departing from the scope of the invention.

[0062] For example, in the first and second embodiments described above, the incense stick is described as a cylindrical structure extending along the first direction X, but the invention is not limited thereto. The incense stick only needs to be in the shape of an elongated strip extending along the first direction X, and its cross-sectional shape along the second direction Y can be any shape such as a circle or a rectangle. In this case, the cross-sectional shapes of the surrounding part and the inner part along the second direction Y can also be shapes corresponding to the incense stick.

[0063] In the above-mentioned first embodiment, the structure of the incense stick having a surrounding part and an inner layer part is described, but it is not limited to this. The incense stick may also include a plurality of layer parts that are separate from each other, as long as the plurality of layer parts are connected to each other in the second direction Y. For example, the plurality of layer parts may include at least one cylindrical surrounding part and at least one columnar inner layer part. In addition, a plurality of columnar layer parts may constitute a columnar incense stick, for example, two identical semi-cylindrical layer parts may constitute a cylindrical incense stick.

[0064] In the first embodiment described above, the small diameter portion is covered by the surrounding portion, but the invention is not limited thereto, and at least a part of the inner layer portion may be covered by the surrounding portion.

[0065] In the first embodiment described above, the inner layer portion includes a large diameter portion and a small diameter portion, but the invention is not limited thereto. The inner layer portion may not have a large diameter portion, but may be a uniform cylindrical shape having a diameter equal to the inner diameter of the surrounding portion. In addition, even when the inner layer portion includes a large diameter portion and a small diameter portion, the step portion and the enlarged diameter portion may not be provided.

[0066] In the first embodiment described above, the method in which the ceramic porosity of the surrounding portion is smaller than the ceramic porosity of the inner layer portion is described, but it is not limited thereto. The ceramic porosity of the surrounding portion may also be equal to the ceramic porosity of the inner layer portion. In this case, the concentration of the essential oil retained by the surrounding portion can be made smaller than the concentration of the essential oil retained by the inner layer portion. Thus, even when the ceramic porosity of the surrounding portion and the inner layer portion is the same, the concentration of the essential oil retained by the surrounding portion is reduced compared to the inner layer portion, so that the concentration perceived by the initial user can be reduced, thereby also improving the problem of excessive initial fragrance concentration.

[0067] In addition, in the second embodiment, the ceramic porosity of the inner layer portion is the same as the ceramic porosity of the surrounding portion, and the ceramic porosity of the filling portion is greater than the ceramic porosity of the surrounding portion, but the invention is not limited thereto. For example, the ceramic porosity of the inner layer portion, the surrounding portion, and the filling portion may be the same.

[0068] In the first and second embodiments, the inner layer, the surrounding part, and the filling part are described as being made of porous ceramics, but the invention is not limited thereto. The inner layer, the surrounding part, and the filling part may also be made of other materials as long as they can be fixed to each other by friction and can absorb the essential oil.

[0069] The present invention has been described above with reference to a specific example. However, the present invention is not limited to the specific example. A design obtained by a person skilled in the art by making appropriate design changes to the specific example is also included in the scope of the present invention as long as it has the features of the present invention.

Claims

1. A fragrance stick for a fragrance device, characterized in that: The incense stick is in the shape of a long strip extending along a first direction, The incense stick includes a plurality of layer parts that are separate from each other, and the plurality of layer parts are joined to each other in a second direction that is orthogonal to the first direction. The plurality of layers are configured to retain essential oils. The plurality of layer portions are each composed of porous ceramics.

2. The incense stick according to claim 1, characterized in that The plurality of layer portions include at least one cylindrical surrounding portion and at least one columnar inner layer portion, At least a portion of the inner layer portion is covered by the surrounding portion.

3. The incense stick according to claim 2, characterized in that The plurality of layer portions include a cylindrical surrounding portion and a cylindrical inner layer portion, The inner layer portion is composed of a large diameter portion and a small diameter portion. The diameter of the large diameter portion is the same as the outer diameter of the surrounding portion, The diameter of the small diameter portion is the same as the inner diameter of the surrounding portion.

4. The incense stick according to claim 3, characterized in that The surrounding portion is in the shape of a bottomed cylinder with one end away from the large diameter portion being closed.

5. The incense stick according to claim 3, characterized in that The inner layer portion further includes a step portion, the step portion is located between the large diameter portion and the small diameter portion, and the diameter of the step portion is smaller than the diameter of the large diameter portion and larger than the diameter of the small diameter portion. The surrounding portion is provided with an expanded diameter portion having an inner diameter the same as the diameter of the step portion. When the inner layer portion is inserted into the surrounding portion, the step portion is engaged with the enlarged diameter portion.

6. The incense stick according to claim 2, characterized in that The ceramic porosity of the surrounding portion is smaller than the ceramic porosity of the inner layer portion.

7. The incense stick according to claim 2, characterized in that The concentration of the essential oil retained by the surrounding portion is lower than the concentration of the essential oil retained by the inner layer portion.

8. A fragrance stick for use in a fragrance device, characterized in that: The incense stick is integrally composed of a cylindrical surrounding part with an open end and a closed end and a columnar inner layer part. The inner layer portion and the surrounding portion are connected at the closed end of the surrounding portion, There is a gap between the inner layer portion and the surrounding portion, The inner layer part and the surrounding part are configured to both retain essential oil. The inner layer portion and the surrounding portion are composed of porous ceramics.

9. The incense stick according to claim 8, characterized in that It also has a cylindrical filling portion, The filling portion is inserted into the gap between the inner layer portion and the surrounding portion, and is closely attached to the inner layer portion and the surrounding portion.

10. The incense stick according to claim 9, characterized in that The filling part is made of porous ceramics. The ceramic porosity of the inner layer portion is the same as the ceramic porosity of the surrounding portion, and the ceramic porosity of the filling portion is greater than or equal to the ceramic porosity of the surrounding portion.

Images