Teflon-lined ventilating duct resistant to acid and alkali gas corrosion

Abstract

The utility model relates to an acid and alkali gas corrosion resistant lining Teflon ventilating duct, which belongs to the technical field of ventilating ducts and comprises a carbon steel duct, connecting pieces are fixed at the left end and the right end of the carbon steel duct, and communicating holes with the same inner diameter as the carbon steel duct are formed in the left sides of the connecting pieces. A lining assembly used for protection is installed on the inner side of the carbon steel pipeline. The lining assembly comprises four positioning protrusions fixed to the inner sides of the two communicating holes correspondingly, a corrosion-resistant lining pipe installed on the inner side of the carbon steel pipeline in a sliding mode, two positioning grooves formed in the outer side of the corrosion-resistant lining pipe, and a corrosion-resistant coating arranged on the inner side of the corrosion-resistant lining pipe in a coating mode. The opening groove is formed in the right side of the corrosion-resistant lining pipe, and the hot melting pipe is fixed to the inner side of the communicating hole. The Teflon-lined ventilating duct resistant to acid and alkali gas corrosion has excellent chemical resistance and corrosion resistance, and can be well suitable for ventilating and discharging acid and alkali gas with high corrosion.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ventilation pipes, in particular to an acid and alkali gas corrosion resistant Teflon lined ventilation pipe. BACKGROUND

[0002] Ventilation pipes are pipe systems for discharging and ventilating gases in chemical plants, laboratories and the like, in chemical production and scientific experiments, the discharged waste gas often contains strong corrosive acid and alkali gases, which need to be continuously discharged to ensure the safety and stability of the experimental or production environment.

[0003] In the prior art, in order to enable the ventilation pipe to be used for a longer time, a rust-proof paint or an epoxy resin coating is usually sprayed on the inner wall of the pipe, however, the discharged gas in a chemical plant and the like has extremely strong corrosiveness, and the rust-proof paint is easily eroded by chemical substances and falls off, losing the protection effect, and although the epoxy resin has good corrosion resistance, it is easily aged and cracked in a long time high-temperature environment, and needs to be repaired, increasing the cost and maintenance time, in view of this, the application provides an acid and alkali gas corrosion resistant Teflon lined ventilation pipe to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] In view of the defects of the prior art, the application provides an acid and alkali gas corrosion resistant Teflon lined ventilation pipe, which has excellent chemical resistance and corrosion resistance, can be well applied to the ventilation and discharge of strong corrosive acid and alkali gases and has the advantages of solving the defects that the existing ventilation pipe is easily damaged due to high temperature or chemical substance erosion in the actual use process, thereby reducing the service life.

[0005] To achieve the above object, the application provides the following technical scheme: an acid and alkali gas corrosion resistant Teflon lined ventilation pipe, comprising a carbon steel pipe, left and right ends of the carbon steel pipe are fixed with connecting plates, a communication hole equal to the inner diameter of the carbon steel pipe is formed in the left side of the connecting plate, and an inner lining assembly for protection is installed on the inner side of the carbon steel pipe.

[0006] The inner lining assembly comprises four positioning protrusions fixed on the inner sides of the two communication holes respectively, a corrosion resistant lining pipe slidingly installed on the inner side of the carbon steel pipe, two positioning grooves formed on the outer side of the corrosion resistant lining pipe, a corrosion resistant coating coated on the inner side of the corrosion resistant lining pipe, an opening groove formed on the right side of the corrosion resistant lining pipe, a hot melt pipe fixed on the inner side of the communication hole, and two sealing rings respectively bonded on the opposite sides of the two connecting plates.

[0007] By adopting the technical scheme, excellent chemical resistance and corrosion resistance are achieved, and the device can be well applied to the ventilation and discharge of strong corrosive acid and alkali gases.

[0008] Further, the left side of the connecting piece is provided with uniformly distributed mounting through holes, and the two ends of the corrosion-resistant inner lining pipe extend to the inner sides of the two communication holes respectively.

[0009] By adopting the technical scheme, the two connecting pieces can be butt-jointed and connected and fixed by bolts and the like through the mounting through holes.

[0010] Further, the two ends of the corrosion-resistant inner lining pipe are located on the same longitudinal horizontal plane on the sides opposite to the two connecting pieces respectively.

[0011] By adopting the technical scheme, the corrosion-resistant inner lining pipe can comprehensively protect the carbon steel pipeline and the inner sides of the communication holes.

[0012] Further, the positioning protrusions are symmetrically distributed upward and downward, the two positioning grooves are symmetrically distributed upward and downward, and the positioning grooves are used for sliding connection of the corresponding two positioning protrusions.

[0013] By adopting the technical scheme, the positioning protrusions can slide on the inner sides of the corresponding positioning grooves.

[0014] Further, the outer side of the positioning protrusion and the inner side of the positioning groove are arc-shaped, and the left side of the positioning groove is provided in an open manner.

[0015] By adopting the technical scheme, the positioning protrusion can smoothly slide, and the corrosion-resistant inner lining pipe can enter the inside of the carbon steel pipeline from right to left.

[0016] Further, the corrosion-resistant inner lining pipe is a Teflon pipeline, and the corrosion-resistant coating layer is a polyurethane coating.

[0017] By adopting the technical scheme, good weather resistance, chemical resistance and adhesion are achieved, so that the corrosion-resistant inner lining pipe can play a double protection effect.

[0018] Further, the inner diameter of the right side of the open groove is greater than that of the left side, and the connection between the left side of the open groove and the inner side of the corrosion-resistant inner lining pipe is arc-shaped.

[0019] By adopting the technical scheme, the gas conveyed through the right side of the open groove can efficiently enter the inside of the corrosion-resistant inner lining pipe.

[0020] Further, the hot melt pipe is wrapped on the inner side of the corrosion-resistant inner lining pipe, and the filling layer is a polyurethane curing layer.

[0021] By adopting the technical scheme, the gap at the input end of the corrosion-resistant lining pipe is further filled by the heat shrinkage characteristics of the hot melt pipe, various shaped gaps can be filled, and good heat insulation, waterproofness, moisture resistance and corrosion resistance are achieved.

[0022] Compared with the prior art, the technical scheme of the application has the following beneficial effects:

[0023] The acid and alkali gas corrosion resistant Teflon lined ventilation pipe has excellent chemical resistance and corrosion resistance by the cooperation between the connecting piece outside the carbon steel pipe and the lining assembly inside, can be well applied to the ventilation and discharge of strong corrosive acid and alkali gas, can effectively prevent the gas from damaging the pipe itself when the acid and alkali gas flows through the pipe, thereby protecting the pipe itself, providing a long-term stable ventilation channel, reducing the additional expenses of enterprises due to frequent replacement of pipes, reducing the frequency of maintenance and maintenance, saving maintenance time, and effectively improving the practicability of the ventilation pipe. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of the application;

[0025] Figure 2 is a structure of the application Figure 1 is a partial enlarged schematic view of part A of the application;

[0026] Figure 3 is a structure of the application Figure 2 is a three-dimensional schematic view of the corrosion-resistant lining pipe connecting structure in the application.

[0027] In the figure: 1, carbon steel pipe; 201, connecting piece; 202, communication hole; 300, lining assembly; 301, positioning protrusion; 302, corrosion-resistant lining pipe; 303, positioning groove; 304, corrosion-resistant coating; 305, open slot; 306, hot melt pipe; 307, sealing ring; 308, filling layer. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the application will be described clearly and completely below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0029] Please refer to Figures 1 to 3The application provides a kind of acid and alkali gas corrosion resistant Teflon lined ventilation duct, including carbon steel pipeline 1, the left and right two ends of carbon steel pipeline 1 are all fixed with connecting piece 201, the left side of connecting piece 201 is provided with the communication hole 202 equal to the inner diameter of carbon steel pipeline 1, and the inner side of carbon steel pipeline 1 is installed with the lining assembly 300 for protection;By the cooperation between the connecting piece 201 of the outer side of carbon steel pipeline 1 and the lining assembly 300 of the inner side, it has excellent chemical resistance and corrosion resistance, can be well applied to the ventilation and discharge work of strong corrosive acid and alkali gas, when acid and alkali gas flows through the pipeline, the damage caused by the gas to the pipeline itself can be effectively prevented, thereby good protection is played to the pipeline itself, so that it can provide long time stable ventilation channel, and also reduce the additional expenditure of enterprise due to frequent replacement of pipeline, and reduce the frequency of repair and maintenance, save maintenance time, thereby effectively improve the practicability of ventilation duct.

[0030] The lining assembly 300 in the embodiment is a structure for preventing corrosion of the carbon steel pipeline 1.

[0031] As shown in Figure 1 , Figure 2 and Figure 3 , the lining assembly 300 includes four positioning protrusions 301 fixed respectively inside the two communication holes 202, a corrosion-resistant lining pipe 302 slidingly installed inside the carbon steel pipeline 1, two positioning grooves 303 opened on the outer side of the corrosion-resistant lining pipe 302, a corrosion-resistant coating 304 coated on the inner side of the corrosion-resistant lining pipe 302, an opening groove 305 opened on the right side of the corrosion-resistant lining pipe 302, a hot melt pipe 306 fixed inside the communication hole 202, and two sealing rings 307 bonded respectively to the opposite sides of the two connecting pieces 201. A filling layer 308 is fixed between the inner side of the carbon steel pipeline 1 and the outer side of the corrosion-resistant lining pipe 302.

[0032] It should be noted that the left side of the connecting piece 201 is provided with uniformly distributed mounting holes, which facilitates the butt joint of the two connecting pieces 201 and the connection and fixation by bolts or other connecting members passing through the mounting holes. The two ends of the corrosion-resistant lining pipe 302 extend respectively to the inner side of the two communication holes 202, and the two ends of the corrosion-resistant lining pipe 302 and the opposite sides of the two connecting pieces 201 are located on the same longitudinal horizontal plane, so that the corrosion-resistant lining pipe 302 can comprehensively protect the inner side of the carbon steel pipeline 1 and the communication hole 202.

[0033] In addition, the positioning protrusions 301 are symmetrically arranged up and down, the two positioning grooves 303 are symmetrically arranged up and down, and the positioning groove 303 is provided for sliding connection of the corresponding two positioning protrusions 301, so that the positioning protrusions 301 can slide on the inner side of the corresponding positioning groove 303, and the outer side of the positioning protrusion 301 and the inner side of the positioning groove 303 are both arc-shaped, facilitating smooth sliding of the positioning protrusion 301.

[0034] Meanwhile, the left side of the positioning groove 303 is provided in an open manner, so that the corrosion-resistant lining pipe 302 can enter the inside of the carbon steel pipeline 1 from right to left, and the right side of the positioning groove 303 can position the corrosion-resistant lining pipe 302. The corrosion-resistant lining pipe 302 is a Teflon pipe, which can also be called a polytetrafluoroethylene pipe. Teflon pipe is a material with two different names. The thickness of the Teflon pipe is not less than two millimeters to ensure good chemical properties. Teflon has strong inertness and can resist various acids, bases, salts and organic matter except for a few media. Teflon is almost not affected by any chemicals and can protect parts from any kind of chemical corrosion, so that the corrosion-resistant lining pipe 302 can effectively protect the carbon steel pipeline 1 from corrosion.

[0035] In addition, the corrosion-resistant coating 304 is a polyurethane coating, which has good weather resistance, chemical resistance and adhesion, so as to cooperate with the corrosion-resistant lining pipe 302 to achieve a double protection effect. Even if the corrosion-resistant coating 304 is damaged, the corrosion-resistant lining pipe 302 can still provide good corrosion resistance, so that the overall protection performance will not be greatly reduced. The corrosion-resistant coating 304 can be sprayed on the inside of the corrosion-resistant lining pipe 302 to form a cylindrical film, without being effectively bonded and fixed to the inside of the corrosion-resistant lining pipe 302. The right inner diameter of the open groove 305 is larger than the left inner diameter. The connection between the left side of the open groove 305 and the inside of the corrosion-resistant lining pipe 302 is arc-shaped, so that the gas transported through the right side of the open groove 305 can efficiently enter the inside of the corrosion-resistant lining pipe 302.

[0036] It should be noted that the heat shrink tube 306 is wrapped on the inside of the corrosion-resistant lining pipe 302, and the heat shrink tube 306 is heated and shrunk to further fill the gap at the input end of the corrosion-resistant lining pipe 302, thereby improving the sealing effect. In combination with the sealing ring 307, good air tightness can be ensured. The filling layer 308 is a polyurethane curing layer, which has very good filling performance and can fill gaps of various shapes. It also has good heat insulation, waterproofness, moisture resistance and corrosion resistance. Specifically, the heated corrosion-resistant lining pipe 302 is inserted into the inside of the carbon steel pipeline 1, and polyurethane is filled between the two to serve as a filling material. This can tightly connect the corrosion-resistant lining pipe 302 and the carbon steel pipeline 1 to ensure the integrity of the ventilation pipeline.

[0037] The working principle of the above embodiment is as follows:

[0038] In the process of ventilating and discharging corrosive gas, the gas enters the inside of the corrosion-resistant lining pipe 302 through the open slot 305, and is then transported to the inside of the next open slot 305 through the left end of the corrosion-resistant lining pipe 302, completing the continuous transportation of the gas. Under the cooperation between the corrosion-resistant lining pipe 302 and the corrosion-resistant coating 304, the whole pipeline has extremely strong corrosion resistance, excellent chemical resistance and high temperature resistance, and high strength under the action of the outer carbon steel pipeline 1, so that it can stably transport corrosive gas for a long time.

[0039] Compared with the prior art, the acid and alkali gas corrosion-resistant Teflon-lined ventilation pipeline has excellent chemical resistance and corrosion resistance through the cooperation between the connecting piece 201 on the outer side of the carbon steel pipeline 1 and the lining assembly 300 on the inner side, and can be well applied to the ventilation and discharge of strong corrosive acid and alkali gas. When the acid and alkali gas flows through the pipeline, it can effectively prevent the pipeline from being damaged by the gas, thereby protecting the pipeline and providing a stable ventilation channel for a long time. Moreover, it reduces the additional expenses of enterprises caused by frequent replacement of pipelines, reduces the frequency of maintenance and repair, and saves maintenance time, thereby effectively improving the practicability of the ventilation pipeline and solving the problem that the existing ventilation pipeline is easily damaged by high temperature or chemical erosion in actual use, thereby reducing the service life.

Claims

1. A Teflon-lined ventilation duct resistant to acid and alkali gas corrosion, comprising a carbon steel duct (1), characterized in that: The carbon steel pipe (1) is fixed with connecting pieces (201) at both ends. A connecting hole (202) with the same inner diameter as the carbon steel pipe (1) is opened on the left side of the connecting piece (201). An inner lining assembly (300) for protection is installed on the inner side of the carbon steel pipe (1). The inner lining assembly (300) includes four positioning protrusions (301) fixed to the inner sides of the two connecting holes (202), a corrosion-resistant inner lining tube (302) slidably installed on the inner side of the carbon steel pipe (1), two positioning grooves (303) opened on the outer side of the corrosion-resistant inner lining tube (302), a corrosion-resistant coating (304) coated on the inner side of the corrosion-resistant inner lining tube (302), an opening groove (305) opened on the right side of the corrosion-resistant inner lining tube (302), a hot melt tube (306) fixed to the inner side of the connecting hole (202), and two sealing rings (307) respectively bonded to the opposite sides of the two connecting pieces (201); a filling layer (308) is fixed between the inner side of the carbon steel pipe (1) and the outer side of the corrosion-resistant inner lining tube (302).

2. The Teflon-lined ventilation duct resistant to acid and alkali gas corrosion according to claim 1, characterized in that: The left side of the connecting piece (201) is provided with uniformly distributed mounting through holes, and both ends of the corrosion-resistant inner liner (302) extend to the inside of the two connecting holes (202).

3. The Teflon-lined ventilation duct resistant to acid and alkali gas corrosion according to claim 1, characterized in that: The two ends of the corrosion-resistant inner liner (302) and the opposite sides of the two connecting pieces (201) are located on the same longitudinal horizontal plane.

4. The Teflon-lined ventilation duct resistant to acid and alkali gas corrosion according to claim 1, characterized in that: The positioning protrusions (301) are symmetrically distributed vertically, and the two positioning grooves (303) are symmetrically distributed vertically, and the positioning grooves (303) are slidably connected to the corresponding two positioning protrusions (301).

5. The Teflon-lined ventilation duct resistant to acid and alkali gas corrosion according to claim 1, characterized in that: The outer side of the positioning protrusion (301) and the inner side of the positioning groove (303) are both arc-shaped, and the left side of the positioning groove (303) is open.

6. The Teflon-lined ventilation duct resistant to acid and alkali gas corrosion according to claim 1, characterized in that: The corrosion-resistant inner lining pipe (302) is a Teflon pipe, and the corrosion-resistant coating (304) is a polyurethane coating.

7. The Teflon-lined ventilation duct resistant to acid and alkali gas corrosion according to claim 1, characterized in that: The inner diameter of the right side of the opening groove (305) is larger than that of the left side, and the connection between the left side of the opening groove (305) and the inner side of the corrosion-resistant inner lining tube (302) is arc-shaped.

8. A Teflon-lined ventilation duct resistant to acid and alkali gas corrosion according to claim 1, characterized in that: The hot melt tube (306) is wrapped around the inside of the corrosion-resistant inner liner tube (302), and the filling layer (308) is a polyurethane cured layer.

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