阅读说明：本技术 一种圆管状基材内壁镀膜的装置 (Device for coating inner wall of tubular substrate ) 是由 姚博 尹乐艳 希治远 尹宇嘉 方泽波 于 2021-08-25 设计创作，主要内容包括：本发明提供一种圆管状基材内壁镀膜的装置,包括样品管、驱动组件、往复式横移组件、中空的支撑杆,所述驱动组件能够固定样品管和带动样品管转动,所述支撑杆与样品管同轴布置,所述往复式横移组件用于带动支撑杆沿着样品管长度方向往复式移动,所述支撑杆内包含有气溶胶导入管和尾气导出管,所述支撑杆伸入样品管的端部为截面呈扇形的喷涂单元。当温度到达预设工艺温度后,气溶胶导入管开始收入气溶胶(气溶胶为液体气溶胶,来自雾化源),气溶胶颗粒在加热元件与样品管的内壁形成的罅隙间向尾气导出管输运,由于温度作用,气溶胶颗粒在发生溶剂蒸发、溶质热分解反应,反应后的固态产物吸附沉积在样品管的内壁上形成薄膜。(The invention provides a device for coating a film on the inner wall of a tubular substrate, which comprises a sample tube, a driving assembly, a reciprocating transverse moving assembly and a hollow supporting rod, wherein the driving assembly can fix the sample tube and drive the sample tube to rotate, the supporting rod and the sample tube are coaxially arranged, the reciprocating transverse moving assembly is used for driving the supporting rod to move in a reciprocating mode along the length direction of the sample tube, an aerosol inlet tube and a tail gas outlet tube are contained in the supporting rod, and the end part of the supporting rod, which extends into the sample tube, is a spraying unit with a fan-shaped section. When the temperature reaches the preset process temperature, the aerosol inlet pipe starts to take in aerosol (the aerosol is liquid aerosol and comes from an atomization source), aerosol particles are transported to the tail gas outlet pipe in a crevice formed between the heating element and the inner wall of the sample pipe, and due to the temperature, the aerosol particles are subjected to solvent evaporation and solute thermal decomposition reaction, and solid products after the reaction are adsorbed and deposited on the inner wall of the sample pipe to form a thin film.)

1. A device for coating the inner wall of a tubular substrate is characterized in that: the device comprises a sample tube (4), a driving assembly, a reciprocating transverse moving assembly and a hollow supporting rod (13), wherein the driving assembly can fix the sample tube (4) and drive the sample tube (4) to rotate, the supporting rod (13) and the sample tube (4) are coaxially arranged, the reciprocating transverse moving assembly is used for driving the supporting rod (13) to reciprocate along the length direction of the sample tube (4), the supporting rod (13) internally comprises an aerosol lead-in tube (12) and a tail gas lead-out tube (11), the end part of the supporting rod (13) extending into the sample tube (4) is a spraying unit with a fan-shaped section, the spraying unit comprises a fan-shaped shell, a heating element (8), a heat insulation filling layer (7), an aerosol nozzle (6) and a tail gas absorption inlet (5), the aerosol nozzle (6) and the tail gas suction inlet (5) are positioned at two corners of the fan-shaped shell and are narrow rectangular sections, heating element (8) are located the top of fan-shaped casing, thermal-insulated filling layer (7) are located the inboard of heating element (8), the atomizing source is connected to the one end of aerosol induction tube (12), and aerosol spout (6) are connected to the other end, tail gas absorbs the one end of entry (5) and connects tail gas sunction inlet (5), and the other end extends to outside bracing piece (13), aerosol spout (6) spun gas gets into tail gas sunction inlet (5) and forms sectorial return channel along between heating element (8) and sample tube (4) inner wall.

2. The apparatus for coating the inner wall of the tubular substrate according to claim 1, wherein: one surface of the heating element (8) corresponding to the sample tube (4) is arc-shaped, and the distance between the arc surface at the top of the heating element (8) and the inner wall of the sample tube (4) is 2 +/-0.5 mm.

3. The apparatus for coating the inner wall of the tubular substrate according to claim 2, wherein: the circumferential angle of the sector-shaped housing is between 30 and 45 degrees.

4. The apparatus for coating the inner wall of the tubular substrate according to claim 1, wherein: the heating element (8) comprises a temperature thermocouple.

5. The apparatus for coating the inner wall of the tubular substrate according to claim 1, wherein: the driving assembly comprises two groups of wheels, each group of wheels comprises two driven wheels (9) and one driving wheel (3), the sample tube (4) is erected between the two driven wheels (9) and the driving wheel (3), the two adjacent driving wheels (3) and the driven wheels (9) are connected through a driving wheel connecting shaft (14), and the driving wheels (3) are coaxially connected with a driving motor (10).

6. The apparatus for coating the inner wall of the tubular substrate according to claim 5, wherein: the driving wheel (3) is pressed on the outer wall of the sample tube (4) with certain pressure through the compression rod (1) and the extension spring (2).

Technical Field

The invention relates to the technical field of coating, in particular to a device for coating the inner wall of a tubular substrate.

Background

In scientific research and production practice, thin film materials have very wide application. The film is made on the surface of the base material, so that multiple functions of rust prevention, wear resistance, corrosion prevention, insulation, electric conduction, reflection enhancement or reflection reduction and the like can be realized. The shape of the substrate is also very diverse, planar, curved, irregular, etc. Among them, the circular tube-shaped substrate is a common one of the non-planar substrates. At present, dozens of film preparation methods have been developed, but none of the methods can realize the preparation of all films, and the selection of a proper preparation method according to the conditions of film components, structures, substrate characteristics and the like is fundamental work in scientific research and production practice.

An oxide film, in particular an electrothermal film with tin dioxide as the main component, is prepared on the inner wall of a round tubular sample made of glass, quartz or ceramic materials, and is very common in various occasions needing heating and heat preservation. The film is prepared by a physical gas phase method, so that the film has high quality, but the energy consumption is high and the cost is high. The preparation by a wet chemical method is technically feasible, but the film cannot be used at a higher temperature, and the prepared film is also seriously polluted (waste liquid and waste gas).

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a device for coating the inner wall of a tubular base material based on an ultrasonic atomization pyrolysis spraying technology, which solves the problems in the background technology.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a device for coating a film on the inner wall of a tubular substrate comprises a sample tube, a driving assembly, a reciprocating transverse moving assembly and a hollow supporting rod, wherein the driving assembly can fix the sample tube and drive the sample tube to rotate, the supporting rod is coaxially arranged with the sample tube, the reciprocating transverse moving assembly is used for driving the supporting rod to move in a reciprocating mode along the length direction of the sample tube, an aerosol inlet tube and a tail gas outlet tube are contained in the supporting rod, the end part of the supporting rod, which extends into the sample tube, is a spraying unit with a fan-shaped cross section, the spraying unit comprises a fan-shaped shell, a heating element, a heat insulation filling layer, an aerosol nozzle and a tail gas absorption inlet, the aerosol nozzle and the tail gas suction inlet are positioned at two corners of the fan-shaped shell and are narrow rectangular cross sections, the heating element is positioned at the top of the fan-shaped shell, and the heat insulation filling layer is positioned at the inner side of the heating element, the one end of aerosol induction tube is connected the atomizing source, and the aerosol spout is connected to the other end, the tail gas sunction inlet is connected to the one end of tail gas absorption entry, and the other end extends outside the bracing piece, the gas of aerosol spout spun gets into the tail gas sunction inlet along between heating element and the sample tube inner wall and forms sectorial return channel.

Preferably, one surface of the heating element corresponding to the sample tube is arc-shaped, and the distance between the arc surface at the top of the heating element and the inner wall of the sample tube is 2 +/-0.5 mm.

Preferably, the circumferential angle of the sector-shaped housing is between 30 and 45 °.

Preferably, the heating element comprises a temperature thermocouple.

Preferably, drive assembly includes two groups of wheels, and each group of wheel has included two from driving wheel and a drive wheel, the sample pipe support is established between two follow driving wheels and a drive wheel, and adjacent two drive wheels, follow and pass through drive wheel connecting shaft between the driving wheel and connect, coaxial coupling has driving motor on the drive wheel.

Preferably, the driving wheel is pressed against the outer wall of the sample tube with a certain pressure by a pressure lever and a tension spring.

(III) advantageous effects

The invention provides a device for coating the inner wall of a tubular substrate. The method has the following beneficial effects:

1. the device for coating the inner wall of the circular tubular base material inputs carrier gas with a certain flow along the aerosol inlet pipe, and the tail gas outlet pipe synchronously starts to work. When the temperature reaches the preset process temperature, the aerosol inlet pipe starts to take in aerosol (the aerosol is liquid aerosol and comes from an atomization source), aerosol particles are transported to the tail gas outlet pipe in a crevice formed between the heating element and the inner wall of the sample pipe, and due to the temperature, the aerosol particles are subjected to solvent evaporation and solute thermal decomposition reaction, and solid products after the reaction are adsorbed and deposited on the inner wall of the sample pipe to form a thin film.

Drawings

FIG. 1 is a schematic side sectional view of the present invention;

FIG. 2 is a schematic plan view of the present invention;

fig. 3 is a front view of the exhaust suction inlet and the aerosol nozzle of the present invention.

In the figure: the device comprises a pressure rod 1, a rope pulling spring 2, a driving wheel 3, a sample tube 4, a tail gas suction inlet 5, an aerosol nozzle 6, a heat insulation filling layer 7, a heating element 8, a driven wheel 9, a driving motor 10, a tail gas delivery tube 11, an aerosol inlet tube 12, a supporting rod 13 and a driving wheel connecting shaft 14.

Detailed Description

The embodiment of the invention provides a device for coating a film on the inner wall of a circular tubular substrate, which comprises a sample tube 4, a driving assembly, a reciprocating transverse moving assembly and a hollow support rod 13, as shown in figures 1-3.

The driving assembly can fix the sample tube 4 and drive the sample tube 4 to rotate, the driving assembly comprises two groups of wheels, each group of wheels comprises two driven wheels 9 and one driving wheel 3, the sample tube 4 is erected between the two driven wheels 9 and the one driving wheel 3, the two adjacent driving wheels 3 and the driven wheels 9 are connected through a driving wheel connecting shaft 14, and the driving wheels 3 are coaxially connected with a driving motor 10. The end of a driving wheel connecting shaft 14 connected with the driving wheel 3 is pivoted on the pressure lever 1, an extension spring 2 is arranged between the bottom of the pressure lever 1 and the carrier, and the driving wheel 3 is pressed on the outer wall of the sample tube 4 with certain pressure through the pressure lever 1 and the extension spring 2. The driving wheel 3 can be separated from the sample tube 4 by pulling the pressure lever 1 upwards. The end of the driving wheel connecting shaft 14 connected with the driven wheel 9 is pivoted on the carrier.

The support rod 13 and the sample tube 4 are coaxially arranged, the reciprocating transverse moving component is used for driving the support rod 13 to move in a reciprocating mode along the length direction of the sample tube 4, and the reciprocating transverse moving component can be a screw rod sliding rail mechanism or an air cylinder. The support rod 13 includes an aerosol inlet tube 12 and a tail gas outlet tube 11 for respectively leading in and leading out aerosol atomization solution. The end of the supporting rod 13 extending into the sample tube 4 is a spraying unit with a fan-shaped section, the spraying unit comprises a fan-shaped shell, a heating element 8, a heat-insulating filling layer 7, an aerosol nozzle 6 and a tail gas absorption inlet 5, the aerosol nozzle 6 and the tail gas suction inlet 5 are positioned at two corners of the fan-shaped shell and have narrow rectangular sections, the heating element 8 is positioned at the top of the fan-shaped shell, the heat-insulating filling layer 7 is positioned at the inner side of the heating element 8, one end of the aerosol lead-in tube 12 is connected with an atomization source, the other end of the aerosol nozzle 6 is connected with one end of the tail gas absorption inlet 5, the other end of the aerosol nozzle extends out of the supporting rod 13, and a lead of the heating element 8 is also led out of the hollow supporting rod 13. The gas sprayed out from the aerosol nozzle 6 enters the tail gas suction inlet 5 along the space between the heating element 8 and the inner wall of the sample tube 4 to form a fan-shaped backflow channel.

One surface of the heating element 8 corresponding to the sample tube 4 is arc-shaped, and the distance between the arc surface at the top of the heating element 8 and the inner wall of the sample tube 4 is a uniform gap of 2 +/-0.5 mm. The circumferential angle of the sector-shaped housing is between 30 and 45 deg..

The heating element 8 comprises a temperature thermocouple. Is a commercially available product that is currently used to monitor the temperature of the heating element 8.

The working principle is as follows: after the sample tube 4 is clamped and fixed, the driving wheel 3 drives the sample tube to rotate at a certain angular speed by the friction force between the driving wheel and the outer wall of the sample tube 4 under the driving of the driving motor 10, and the rotating direction is as shown in fig. 1. A carrier gas is supplied at a predetermined flow rate along the aerosol inlet pipe 12, and the exhaust gas outlet pipe 11 is operated simultaneously. When the temperature reaches the predetermined process temperature, the aerosol introduction tube 12 starts to receive aerosol (the aerosol is liquid aerosol and comes from the atomization source), aerosol particles are transported to the exhaust gas delivery tube 11 in the crevice formed between the heating element 8 and the inner wall of the sample tube 4, and due to the temperature effect, the aerosol particles are subjected to solvent evaporation and solute thermal decomposition reaction, and the reacted solid products are adsorbed and deposited on the inner wall of the sample tube 4 to form a thin film. The tail gas after the reaction is discharged through a tail gas delivery pipe 11. The tail gas suction inlet 5 and the aerosol nozzle 6 are in a bell mouth shape near the inner part of the sample tube 4, the gap between one side edge of the tail gas suction inlet 5 and the aerosol nozzle 6 far away from the heating element 8 and the inner wall of the sample tube 4 is far smaller than the gap between the heating element 8 and the inner wall of the sample tube 4, and the gap is 0.4-0.7mm (the thickness of a finally deposited film needs to be considered, and the film is prevented from being scraped). Usually, the length of the sample tube 4 is greater than that of the spraying unit, and the spraying unit moves at a constant speed along the axis of the sample tube 4 along with the support rod 13 to form spiral line-like scanning on the inner wall of the sample tube 4. According to the actual product requirements, the axial reciprocating times and the axial reciprocating speed of the supporting rod 13 along the sample tube 4 can be set within a certain range.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.