A heating wire and preparation method thereof

Abstract

This invention provides a heating wire and its preparation method. The heating wire comprises a microporous glass body, which includes a cylindrical body and a conical body disposed beneath the cylindrical body. A plurality of heating wires are disposed inside the cylindrical body. The surface and interior of the cylindrical body and the conical body have honeycomb-like micropores. A method for preparing the heating wire is also provided. In this invention, the microporous glass body constituting the heating wire is formed by pressing inorganic glass microspheres together using a mold in a molten or semi-molten state. Therefore, it has a stable structure, a regular shape, and honeycomb-like micropores on its surface and interior.

Description

Technical Field

[0001] The present invention relates to the technical field of inorganic materials, and in particular to an electric heating wire and a preparation method thereof. Background Art

[0002] The heating wire is used to heat and bake the tobacco to form smoke. The heating wire is an important part of the atomization system, and its performance has a significant impact on the precision of the measurement and chemical interference. Therefore, the heating wire is required to have stable heating, fast heating speed, small and uniform droplets, and high smoke conversion efficiency.

[0003] The existing heating wires are basically made of thick film resistors and thermocouples, which are easy to break, have complex processes and low yields. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a heating wire and a preparation method thereof.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A heating wire comprising

[0007] The microporous glass body comprises a cylinder and a cone arranged at one end of the cylinder, a plurality of heating wires are arranged inside the cylinder, and the surfaces and insides of the cylinder and the cone are provided with honeycomb micropores.

[0008] Furthermore, the microporous glass body has a regular shape, and has honeycomb-like micropores formed by particle accumulation on the surface and inside.

[0009] Furthermore, the honeycomb micropores present a regular three-dimensional interconnected structure.

[0010] Furthermore, the microporous glass body is made by the following steps: 5-35 μm inorganic glass microspheres are placed in a sintering device and fired at high temperature to form molten microspheres or semi-molten microspheres, which are then injected into a mold with a paraffin filler in a molten or semi-molten state to form a microporous glass body with a three-dimensional interconnected structure, and then the paraffin is melted by secondary sintering to form a microporous glass body.

[0011] Furthermore, the mold includes an upper mold shell and a lower mold shell, an upper mold body and a lower mold body arranged between the upper mold shell and the lower mold shell, an upper mold cavity and a lower mold cavity are correspondingly arranged inside the upper mold body and the lower mold body, the upper mold cavity and the lower mold cavity constitute an inner mold, and a first perforation and a second perforation are arranged in the middle part of the upper end of the upper mold shell, the bottom of the first perforation and the second perforation are connected with a mixing hole, the mixing hole is arranged in the inner mold, and a third perforation is also arranged at the first perforation and the second perforation, the third perforation is connected with the embedded pipe through a flow channel, and the embedded pipe is arranged in the inner mold.

[0012] Furthermore, the inner film includes an inner mold cylinder and an inner mold cone connected to the inner mold cylinder, and the embedded tube is arranged on the inner mold cylinder.

[0013] Furthermore, the embedded pipe is provided with evenly arranged through holes.

[0014] The present invention also provides a method for preparing a heating wire, comprising the following steps:

[0015] 1) Place 5-35 μm inorganic glass microspheres in a sintering device and sinter at high temperature to form molten microspheres or semi-molten microspheres;

[0016] 2) The molten microspheres or semi-molten microspheres obtained in step 1) are injected through the first perforation by an injection molding machine, and at the same time, paraffin filler is injected through the second perforation and the third perforation, and the flow rate ratio of the first perforation to the second perforation is controlled to be 0.8-1:0.6-1.2, so that the molten microspheres or semi-molten microspheres and the paraffin filler are mixed at the mixing hole and injected into the mold to accumulate into a microporous glass body with a three-dimensional interconnected structure;

[0017] During the third perforation process of injecting the paraffin filler, an inert gas is introduced through a pressure pump so that the embedded pipe and the microporous glass body are always kept separated;

[0018] 3) After step 2) is completed, the mold is opened, the embedded tube is separated from the microporous glass body, the microporous glass body is taken out, and the paraffin is melted by secondary sintering to form the mold;

[0019] 4) Implant a heating wire into the microporous vitreous body.

[0020] Furthermore, in step 3), after the embedded tube is separated from the microporous glass body, a embedded hole is formed on the microporous glass body.

[0021] In step 4), the heating wire is implanted in the pre-buried hole.

[0022] Furthermore, in step 3), after forming, the mold is sintered at a temperature of 800 to 1000° C. for 5 to 15 minutes to melt the filler and form a microporous glass body with pure particle accumulation.

[0023] Compared with the conventional technology, the microporous glass body constituting the heating wire in the present invention is formed by pressing inorganic glass microspheres in a molten or semi-molten state through a mold, so the structure is stable, the microporous glass body has a regular shape, and has honeycomb micropores formed by particle accumulation on the surface and inside. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the electric heating wire in the present invention;

[0025] Figure 2 For the present invention Figure 1 A cross-sectional view;

[0026] Figure 3 It is a structural schematic diagram of the mold in the present invention;

[0027] Figure 4 It is a top view of the mold in the present invention. DETAILED DESCRIPTION

[0028] The present invention provides a heating wire and a preparation method thereof, which will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] Reference Figure 1 to Figure 2 The present invention provides a heating wire and a microporous glass body, which includes a cylinder 2 and a cone 1 arranged at one end of the cylinder, and a plurality of heating wires 3 are arranged inside the cylinder 2. The surface and interior of the cylinder and the cone have honeycomb micropores.

[0030] The microporous glass body has a regular shape, and has honeycomb-like micropores 4 formed by particle accumulation on the surface and inside.

[0031] The honeycomb micropores present a regular three-dimensional interconnected structure.

[0032] The microporous glass body is formed by injecting 5-35 μm inorganic glass microspheres in a molten or semi-molten state with a filler into a mold, and then pressurizing, cooling, and sintering.

[0033] The microporous glass body has a regular shape, and has honeycomb-like micropores stacked on the surface and inside.

[0034] The present invention also provides a method for preparing a microporous glass body, which comprises placing 5-35 μm inorganic glass microspheres in a sintering device and sintering at a high temperature to form molten microspheres or semi-molten microspheres, injecting the microspheres into a mold with a paraffin filler in a molten or semi-molten state, and accumulating them into a microporous glass body with a three-dimensional interconnected structure, and then performing a secondary sintering to melt the paraffin to form a microporous glass body. The microporous glass body prepared by the method is pressed in a molten or semi-molten state, so that during the pressing process, the microspheres in the molten or semi-molten state form adhesion and have a stable structure.

[0035] Since paraffin or gum is used as a filler during the injection process, it has two functions: first, it melts after contacting the microspheres in a molten or semi-molten state, thereby achieving the purpose of cooling; second, the paraffin or gum forms a flowing fluid after melting and fills between the microspheres. During pressing, the excess is squeezed out, but a large amount is still filled between the microspheres, ensuring the three-dimensional interconnected structure between the microspheres.

[0036] In the above, the sintering device can be selected from, for example, an inorganic microsphere rapid sintering device with patent publication number: "CN103553304A".

[0037] For secondary sintering, a conventional sintering furnace can be used.

[0038] Reference Figure 3 and Figure 4 In the present invention, the mold includes an upper mold shell 100 and a lower mold shell 103, an upper mold body 101 and a lower mold body 102 arranged between the upper mold shell 100 and the lower mold shell 103, an upper mold cavity 109 and a lower mold cavity 111 are correspondingly arranged inside the upper mold body 101 and the lower mold body 102, the upper mold cavity and the lower mold cavity constitute an inner mold 110, and a first perforation 105 and a second perforation 106 are arranged in the middle part of the upper end of the upper mold shell, and the bottoms of the first perforation and the second perforation are connected with a mixing hole 107, and the mixing hole 107 is arranged in the inner mold 110, and a third perforation 104 is also arranged at the first perforation and the second perforation, and the third perforation 104 is connected with a pre-buried pipe 108 through a flow channel, and the pre-buried pipe 108 is arranged in the inner mold 110.

[0039] The inner film 110 includes an inner mold cylinder and an inner mold cone connected to the inner mold cylinder, and the embedded tube is arranged on the inner mold cylinder.

[0040] The embedded tube is provided with evenly arranged through holes, and its function is that when the molten microspheres or semi-molten microspheres are injected by the injection molding machine, the embedded tube is easy to form adhesion with the molten microspheres or semi-molten microspheres. In order to prevent adhesion, paraffin filler is injected into the third perforation, and inert gas is introduced through a pressure pump, so that the embedded tube and the microporous glass body are always kept separated.

[0041] In order to facilitate demoulding, demoulding mechanisms 112 are correspondingly provided on the lower mold shell 103 and the lower mold body 102. The demoulding mechanism is consistent with the traditional structure, and cooling holes are also provided on the outer side of the inner mold. Figure 4 , in the upper mold shell 100, the cooling holes 113 are evenly arranged.

[0042] The present invention also provides a method for preparing a heating wire, comprising the following steps:

[0043] 1) Place 5-35 μm inorganic glass microspheres in a sintering device and sinter at high temperature to form molten microspheres or semi-molten microspheres;

[0044] 2) The molten microspheres or semi-molten microspheres obtained in step 1) are injected through the first perforation by an injection molding machine, and at the same time, paraffin filler is injected through the second perforation and the third perforation, and the flow rate ratio of the first perforation to the second perforation is controlled to be 0.8-1:0.6-1.2, so that the molten microspheres or semi-molten microspheres and the paraffin filler are mixed at the mixing hole and injected into the mold to accumulate into a microporous glass body with a three-dimensional interconnected structure;

[0045] During the third perforation process of injecting the paraffin filler, an inert gas is introduced through a pressure pump so that the embedded pipe and the microporous glass body are always kept separated;

[0046] 3) After step 2) is completed, the mold is opened, the embedded tube is separated from the microporous glass body, the microporous glass body is taken out, and the paraffin is melted by secondary sintering to form the mold;

[0047] 4) Implant a heating wire into the microporous vitreous body.

[0048] Furthermore, in step 3), after the embedded tube is separated from the microporous glass body, a embedded hole is formed on the microporous glass body.

[0049] In step 4), the heating wire is implanted in the pre-buried hole.

[0050] In step 3), after forming, the mold is sintered at a temperature of 800 to 1000° C. for 5 to 15 minutes to melt the filler and form a microporous glass body with pure particle accumulation.

[0051] In the above, the injection molding machine may be a conventional injection molding machine.

[0052] The preparation process of the microporous glass body is further described below in conjunction with the examples.

[0053] Embodiment 1, a method for preparing a microporous glass body, comprising placing 5-35 μm inorganic glass microspheres in a sintering device and firing them at a high temperature to form molten microspheres or semi-molten microspheres, converging the molten microspheres or semi-molten microspheres in a collection area under vacuum conditions, injecting the molten microspheres or semi-molten microspheres and fillers into a mold at a ratio of 0.8-1:0.6-1.2, pressurizing and cooling to form, and sintering at a temperature of 800-1000°C for 5-15 minutes after forming to melt the fillers and form a microporous glass body with pure particle accumulation.

[0054] Embodiment 2, a method for preparing a microporous glass body, comprising placing 5-35 μm inorganic glass microspheres in a sintering device and firing them at a high temperature to form molten microspheres or semi-molten microspheres, converging the molten microspheres or semi-molten microspheres in a collection area under inert gas conditions, injecting the molten microspheres or semi-molten microspheres and fillers into a mold at a ratio of 0.8-1:0.6-1.2, pressurizing and cooling to form, and sintering at a temperature of 800-1000°C for 5-15 minutes after forming to melt the fillers and form a microporous glass body with pure particle accumulation.

[0055] Embodiment 3, a method for preparing a microporous glass body, comprising placing 5-25 μm inorganic glass microspheres into a sintering device and firing at a high temperature to form molten microspheres or semi-molten microspheres, converging the molten microspheres or semi-molten microspheres in a collection area under vacuum conditions, injecting the molten microspheres or semi-molten microspheres and fillers into a mold at a ratio of 0.8-1:0.6-0.8, pressurizing and cooling to form, and sintering at a temperature of 800-1000°C for 5-15 minutes after forming to melt the fillers and form a microporous glass body with pure particle accumulation.

[0056] Embodiment 4, a method for preparing a microporous glass body, comprising placing 5-25 μm inorganic glass microspheres in a sintering device and firing them at a high temperature to form molten microspheres or semi-molten microspheres, converging the molten microspheres or semi-molten microspheres in a collection area under inert gas conditions, injecting the molten microspheres or semi-molten microspheres and fillers into a mold at a ratio of 0.8-1:0.6-0.8, pressurizing and cooling to form, and sintering at a temperature of 800-1000°C for 5-15 minutes after forming to melt the fillers and form a microporous glass body with pure particle accumulation.

[0057] Example 5, a method for preparing a microporous glass body, comprising placing 5-15 μm inorganic glass microspheres into a sintering device and firing them at a high temperature to form molten microspheres or semi-molten microspheres, converging the molten microspheres or semi-molten microspheres in a collection area under vacuum conditions, injecting the molten microspheres or semi-molten microspheres and fillers into a mold at a ratio of 0.8:0.6, pressurizing and cooling to form, and sintering at a temperature of 800-1000°C for 5-15 minutes after forming to melt the fillers and form a microporous glass body with pure particle accumulation.

[0058] Example 6, a method for preparing a microporous glass body, comprising placing 5-15 μm inorganic glass microspheres into a sintering device and firing them at a high temperature to form molten microspheres or semi-molten microspheres, converging the molten microspheres or semi-molten microspheres in a collection area under inert gas conditions, injecting the molten microspheres or semi-molten microspheres and fillers into a mold at a ratio of 0.8:0.6, pressurizing and cooling to form, and sintering at a temperature of 800-1000°C for 5-15 minutes after forming to melt the fillers and form a microporous glass body with pure particle accumulation.

[0059] Example 7, a method for preparing a microporous glass body, comprising placing 5-15 μm inorganic glass microspheres into a sintering device and firing them at a high temperature to form molten microspheres or semi-molten microspheres, converging the molten microspheres or semi-molten microspheres in a collection area under vacuum conditions, injecting the molten microspheres or semi-molten microspheres and fillers into a mold at a ratio of 0.8:0.7, pressurizing and cooling to form, and sintering at a temperature of 800-1000°C for 5-15 minutes after forming to melt the fillers and form a microporous glass body with pure particle accumulation.

[0060] Example 8, a method for preparing a microporous glass body, comprising placing 5-15 μm inorganic glass microspheres into a sintering device and firing them at a high temperature to form molten microspheres or semi-molten microspheres, converging the molten microspheres or semi-molten microspheres in a collection area under inert gas conditions, injecting the molten microspheres or semi-molten microspheres and fillers into a mold at a ratio of 0.8:0.7, pressurizing and cooling to form, and sintering at a temperature of 800-1000°C for 5-15 minutes after forming to melt the fillers and form a microporous glass body with pure particle accumulation.

[0061] Comparative example: The microporous glass bodies formed in Examples 1 to 8 were compared. It was found that when the particle size of the inorganic glass microspheres is greater than 25 μm, when the ratio of the molten microspheres or semi-molten microspheres to the filler is larger during injection (for example, molten microspheres or semi-molten microspheres: filler = 0.8:1.2), the obtained microporous glass body has the best performance.

[0062] When the particle size of the inorganic glass microspheres is between 15 and 25 μm, and the ratio of the molten microspheres or semi-molten microspheres to the fillers during injection is close (eg, molten microspheres or semi-molten microspheres: fillers = 1:1), the resulting microporous glass has the best performance.

[0063] When the particle size of the inorganic glass microspheres is less than 15 μm, when the ratio of molten microspheres or semi-molten microspheres to fillers during injection is less than that of fillers (for example, molten microspheres or semi-molten microspheres: fillers = 0.8:0.6), the performance of the obtained microporous glass body is optimal.

[0064] In the above, when preparing the heating wire, the particle size of the inorganic glass microsphere should be selected to be less than 15μm. When the ratio of the molten microsphere or semi-molten microsphere to the filler is small (for example, the molten microsphere or semi-molten microsphere: filler = 0.8:0.6) during injection, the performance of the obtained heating wire is the best.

Claims

1. A heating wire, characterized in that: The microporous glass body comprises a cylinder and a cone arranged at one end of the cylinder, a plurality of heating wires are arranged inside the cylinder, and the surfaces and insides of the cylinder and the cone have honeycomb-shaped micropores formed by particle accumulation, and the honeycomb-shaped micropores are in a three-dimensional interconnected structure. The microporous glass body is made by the following steps: placing 5-35 μm inorganic glass microspheres in a sintering device and sintering at high temperature to form molten microspheres or semi-molten microspheres, injecting them into a mold with a paraffin filler in a molten or semi-molten state, accumulating them into a microporous glass body with a three-dimensional interconnected structure, and then melting the paraffin through secondary sintering to form a microporous glass body.

2. A method for preparing a heating wire, characterized in that: The steps include: 1) Place 5-35 μm inorganic glass microspheres in a sintering device and sinter at high temperature to form molten microspheres or semi-molten microspheres; 2) The molten microspheres or semi-molten microspheres obtained in step 1) are injected through the first perforation by an injection molding machine, and at the same time, paraffin filler is injected through the second perforation and the third perforation, and the flow rate ratio of the first perforation to the second perforation is controlled to be 0.8-1:0.6-1.2, so that the molten microspheres or semi-molten microspheres and the paraffin filler are mixed and injected into the mold at the mixing hole to accumulate into a microporous glass body with a three-dimensional interconnected structure; the mold includes an upper mold shell and a lower mold shell, an upper mold body and a lower mold body arranged between the upper mold shell and the lower mold shell, and the upper mold body and the lower mold body An upper mold cavity and a lower mold cavity are correspondingly arranged inside the body, and the upper mold cavity and the lower mold cavity constitute an inner mold. A first perforation and a second perforation are arranged in the middle part of the upper end of the upper mold shell, and the bottoms of the first perforation and the second perforation are connected with a mixing hole, and the mixing hole is arranged in the inner mold. A third perforation is also arranged at the first perforation and the second perforation, and the third perforation is connected with a pre-buried pipe through a flow channel, and the pre-buried pipe is arranged in the inner mold; during the process of injecting paraffin filler into the third perforation, an inert gas is introduced through a pressure pump, so that the pre-buried pipe and the microporous glass body are always kept separated; 3) After step 2) is completed, the mold is opened, the embedded tube is separated from the microporous glass body, the microporous glass body is taken out, and the paraffin is melted by secondary sintering to form the mold; 4) Implanting a heating wire in the microporous vitreous body, In step 3), after the pre-buried tube is separated from the microporous glass body, a pre-buried hole is formed on the microporous glass body. In step 4), the heating wire is implanted in the pre-buried hole.

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