Metal needle type heater

Abstract

The utility model relates to a metal needle type heater, which is used for heating a non-combustible smoking set and comprises a needle type metal sleeve, a glaze layer is arranged on the outer surface of the needle type metal sleeve, a metal heating wire is arranged in the needle type metal sleeve, and heat conduction ceramic is filled between the needle type metal sleeve and the metal heating wire. Compared with the prior art, the utility model has the beneficial effects that in order to reduce carbon deposition and metal peculiar smell of the metal base material, the metal shell is glazed, a liquid phase can be generated when the glaze layer is sintered, a smooth and compact surface is generated after the glaze layer is sintered and cooled, the adhesive force to tobacco tar is small, and the tar on the surface of the glaze layer is easy to thoroughly clean; therefore, carbon deposition is avoided. And meanwhile, the glaze layer effectively isolates metal peculiar smell, suction consistency is improved, the service life of a heating non-combustion device is greatly prolonged, and the use experience of the heating non-combustion device is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a metal needle type heater for heating non-combustible smoking set. BACKGROUND

[0002] The needle type heater is a commonly used heating component in the heating non-combustible smoking set, and its structure is that a metal heating wire is fixedly arranged in a needle-shaped metal tube. When in use, the needle type heater heats tobacco to generate smoke, and the smoke contains tar. On the one hand, metal has good lipophilicity, and after contacting with tobacco tar, the tobacco tar is easily attached to the surface of the needle-shaped metal tube and is difficult to clean. On the other hand, the existing preparation method of the metal thin tube has a large roughness of the outer surface of the tube material, and the process cost for improving the flatness of the outer wall of the metal tube material is high, and it is difficult to reduce the roughness, which further aggravates the attachment of the tobacco tar on the surface of the metal tube material. Finally, with the extension of the use time, the tar is easily attached to the outer wall of the needle type heater to form carbon deposit with a certain hardness, which is difficult to clean and shortens the service life of the heating non-combustible device. The carbon deposit produces a burnt smell during smoking, which affects the use experience. In addition to the difficulty in cleaning the attached tar, the pure metal shell also has a baked metal smell, which affects the smoking experience.

[0003] The material of the metal heating needle is usually stainless steel, and the thermal conductivity coefficient is about 15 W / (m·K), the heat transfer is fast, and the preheating time is short. The existing zirconia ceramic heating needle has a low thermal conductivity coefficient of only about 2 W / (m·K), the heat transfer is slow, and the preheating waiting time during smoking is long.

[0004] Therefore, the utility model aims to provide a metal needle type heater with glaze sealing treatment, which comprises a needle-shaped metal sleeve, the outer surface of the needle-shaped metal sleeve is subjected to glaze sealing treatment to form a glaze layer, a metal heating wire is fixedly arranged in the needle-shaped metal sleeve, and a heat-conducting ceramic is filled between the needle-shaped metal sleeve and the metal heating wire. By sealing the metal shell with glaze, the glaze layer can generate a liquid phase during sintering, and the surface after cooling is very smooth and dense, has a small adhesion to tobacco tar, and the tar on the surface of the glaze layer can be easily cleaned, thereby avoiding the burnt smell caused by carbon deposit. At the same time, the glaze layer effectively isolates the metal smell, improves the consistency of smoking, and greatly prolongs the service life and use experience of the heating non-combustible device. SUMMARY

[0005] The utility model discloses a metal needle type heater of enamel processing, which comprises a needle type metal sleeve, an enamel layer formed on the outer surface of the needle type metal sleeve by enamel processing, a metal heating wire fixed in the needle type metal sleeve, and heat-conducting ceramic filled between the needle type metal sleeve and the metal heating wire.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] A metal needle type heater comprises a needle type metal sleeve, an enamel layer formed on the outer surface of the needle type metal sleeve, and a metal heating wire fixed in the needle type metal sleeve, and heat-conducting ceramic filled between the needle type metal sleeve and the metal heating wire.

[0008] The preparation method of the enamel layer comprises the following steps: (1) preparing a metal base material into a hollow needle type metal sleeve, coating or dipping the enamel slurry on the outer surface of the needle type metal sleeve by spraying or dipping, and then solidifying and sintering; and (2) placing a spiral heating wire in the needle type metal sleeve subjected to the enamel processing, injecting heat-conducting ceramic slurry, and then solidifying and sintering.

[0009] Further, the use temperature of the heating non-combustion device is usually not higher than 500 DEG C, and is between 300 DEG C and 500 DEG C. In order to ensure the stability of the enamel layer during use, the sintering temperature of the enamel should be higher than the use temperature, and is preferably between 600 DEG C and 900 DEG C.

[0010] Further, the use temperature of the heating non-combustion device is usually not higher than 500 DEG C, and is between 300 DEG C and 500 DEG C. In order to ensure the stability of the enamel layer during use, the sintering temperature of the enamel should be higher than the use temperature, and is preferably between 600 DEG C and 900 DEG C.

[0011] Further, the material of the needle type metal sleeve is stainless steel, magnesium alloy or aluminum alloy.

[0012] Further, in order to improve the overall heat transfer effect of the metal needle type heater, the thermal conductivity of the enamel layer should be as high as possible, and is preferably higher than 1 W / (m·K).

[0013] The specific components of the glaze layer can be selected based on the specific performance of the metal substrate, and the commercially available product that matches the metal substrate is selected from commercially available raw materials, which will not be described here.

[0014] Further, the thickness of the glaze layer is less than 15um, which improves the heat transfer effect and reduces heat loss.

[0015] Further, the metal heating wire is a spiral wire or a linear wire.

[0016] Further, the heat-conducting ceramic is selected from a ceramic product with a high thermal conductivity, and is preferably an aluminosilicate ceramic.

[0017] Compared with the prior art, the beneficial effects of the utility model are that in order to reduce the carbon deposition and metal odor of the metal substrate, the utility model is sealed with glaze on the metal shell, the glaze layer can generate a liquid phase during sintering, and a very smooth and dense surface is generated after sintering and cooling, which has a small adhesion to tobacco tar and is easy to clean the tar on the surface of the glaze layer, thereby avoiding the generation of carbon deposition and burnt smell. At the same time, the glaze layer effectively isolates the metal odor, improves the consistency of smoking, and greatly prolongs the service life and use experience of the heating non-combustion device.

[0018] Since the thermal conductivity of the glaze layer is low, in order to ensure the heating effect of the metal needle type heating device, the thickness of the glaze layer is controlled to be less than 15um, and the thermal conductivity of the glaze layer is optimized. In order to ensure the service life of the metal needle type heating device, the glaze layer with a thermal expansion coefficient matching the metal substrate is preferred. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The metal needle type heating device is sealed with glaze in the utility model.

[0020] Figure 2 The metal needle type heating device is sealed with glaze in the utility model. Figure 1 The front end of the metal needle type heating device sealed with glaze in the utility model is enlarged.

[0021] 1-glaze layer; 2-needle type metal sleeve; 3-heat-conducting ceramic; 4-metal heating wire. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship and movement condition between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0024] Embodiment 1

[0025] The embodiment provides a metal needle type heater, which comprises a needle type metal sleeve 2, an enamel layer 1 formed by enamel treatment on the outer surface of the needle type metal sleeve, a metal heating wire 4 fixed in the needle type metal sleeve, and heat-conducting ceramic 3 filled between the needle type metal sleeve and the spiral metal heating wire. Figure 1 and Figure 2 as shown, Figure 1 is a complete schematic view, Figure 2 is a partial enlarged view of Figure 1 , the metal needle type heater comprises a needle type metal sleeve 2, an enamel layer 1 formed by enamel treatment on the outer surface of the needle type metal sleeve, a metal heating wire 4 fixed in the needle type metal sleeve, and heat-conducting ceramic 3 filled between the needle type metal sleeve and the spiral metal heating wire.

[0026] The preparation method of the enamel layer 1 comprises: configuring an enamel slurry, coating the enamel slurry on the outer surface of the needle type metal sleeve, and sintering. Specifically, the steps include: (1) preparing a metal base material into a hollow needle type metal sleeve 2, coating an enamel slurry on the outer surface of the needle type metal sleeve 2 by spraying, and then solidifying and sintering; (2) placing a spiral heating wire 4 in the enamel treated needle type metal sleeve 2, injecting a heat-conducting ceramic slurry, and then solidifying and sintering.

[0027] The material of the needle type metal sleeve 2 is stainless steel.

[0028] The suitable enamel slurry is selected so that the thermal expansion coefficient of the needle type metal sleeve is 1.05 times the thermal expansion coefficient of the enamel. The thermal conductivity of the enamel layer 1 is about 1.5 W / (m·K). The thickness of the enamel layer 1 is about 12 μm.

[0029] The metal heating wire 4 is a linear wire. The heat-conducting ceramic is an aluminosilicate ceramic.

[0030] Embodiment 2

[0031] The embodiment provides a metal needle type heater, which is different from embodiment 1 in that

[0032] The sintering temperature of the enamel is about 750 DEG C. The material of the needle type metal sleeve 2 is magnesium alloy.

[0033] The suitable enamel slurry is selected so that the thermal expansion coefficient of the needle type metal sleeve is 1.10 times the thermal expansion coefficient of the enamel.

[0034] The thermal conductivity of the enamel layer 1 is about 1.8 W / (m·K). The thickness of the enamel layer 1 is about 11 μm. The metal heating wire 4 is a spiral wire. The heat-conducting ceramic is an aluminosilicate ceramic.

[0035] The rest is the same as example 1, which will not be repeated here.

[0036] Example 3

[0037] This embodiment provides a metal needle type heater, which is different from example 1,

[0038] The sintering temperature of the glaze is about 800 DEG C. The material of the needle type metal sleeve 2 is aluminum alloy.

[0039] The suitable glaze slurry is selected, so that the thermal expansion coefficient of the needle type metal sleeve and the thermal expansion coefficient of the glaze is 0.95.

[0040] The thermal conductivity of the glaze layer 1 is about 1.9 W / (m·K). The thickness of the glaze layer 1 is about 12 μm. The metal heating wire 4 is a linear wire. The heat-conducting ceramic is aluminum silicate ceramic.

[0041] The rest is the same as example 1, which will not be repeated here.

[0042] According to the disclosure and teaching of the above description, the skilled in the art of the present application can also make appropriate changes and modifications to the above embodiments. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the present application should fall within the protection scope of the claims of the present application. In addition, although some specific terms are used in the specification, these terms are only for convenience of explanation and do not constitute any limitation on the present application.

Claims

1. A metal needle type heat generator characterized by: The needle metal sleeve has an enamel layer on its outer surface and a metal heating wire inside, and is filled with heat-conducting ceramic between the needle metal sleeve and the metal heating wire.

2. The metal needle type heat generator according to claim 1, characterized by: The ratio of the thermal expansion coefficient of the needle metal sleeve to the thermal expansion coefficient of the enamel layer is 0.8-1.

2.

3. The metal needle type heat generator according to claim 1, characterized by: The needle metal sleeve is made of stainless steel, magnesium alloy or aluminum alloy.

4. The metal needle type heat generator according to claim 1, characterized by: The thermal conductivity of the enamel layer is above 1 W / (m·K).

5. The metal needle type heat generator according to claim 1, wherein The thickness of the enamel layer is less than 15 μm.

6. The metal needle type heat generator according to claim 2, wherein The ratio of the thermal expansion coefficient of the needle metal sleeve to the thermal expansion coefficient of the enamel layer is 0.9-1.

1.

7. The metal needle type heat generator according to claim 1, wherein The metal heating wire is a spiral wire or a straight wire.

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