Novel ultra-pure chemical conveying pipeline

Abstract

The utility model provides a novel ultra-pure chemical conveying pipeline which comprises a metal outer pipe and a plastic inner pipe, and the plastic inner pipe is arranged in the metal outer pipe in a sleeved mode. The end of the plastic inner pipe extends out of the metal outer pipe in the axial direction of the metal outer pipe, the outer wall, located on the outer side of the metal outer pipe, of the plastic inner pipe is fixedly connected with an injection molding layer in the circumferential direction, and the end face, away from one side of the metal outer pipe, of the injection molding layer is flush with the end face of the plastic inner pipe. In any section in the axis direction of the plastic inner pipe, the inner wall of the plastic inner pipe is perpendicular to the end face of the plastic inner pipe and the end face of the injection molding layer. In any section in the axis direction of the plastic inner pipe, the inner wall of the plastic inner pipe is perpendicular to the end face of the plastic inner pipe and the end face of the injection molding layer, that is, no chamfered face or rounded face exists between the end face of the plastic inner pipe and the end face of the injection molding layer, and therefore when adjacent novel ultra-pure chemical conveying pipelines are in butt joint, the adjacent novel ultra-pure chemical conveying pipelines can be butted. And the purpose of seamless connection of the two plastic inner pipes is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, specifically a new type of ultra-pure chemical transportation pipeline. The plastic-lined pipe realizes residue-free, efficient and safe transportation of chemicals through a unique structural design, and is particularly suitable for chemical production environments with extremely high requirements for material purity. Background Art

[0002] In high-tech fields like semiconductors, biomedicine, and electronic materials, the purity of chemicals directly impacts the quality and performance of the final product. Traditional metal pipelines, when transporting high-purity chemicals, are susceptible to chemical contamination due to factors such as surface roughness, oxide layers, and corrosion. To address this issue, the industry typically uses plastic-lined pipes for transport.

[0003] Existing plastic-lined pipes typically use a flanging process to create a smooth outer edge around the edge of the plastic pipe that meets adjacent fittings. This process involves using a die to press-turn the edge of a hole or outer edge in the sheet metal into a smooth, rounded edge. However, this flanging creates a chamfer between the inner wall and the end face of the plastic inner pipe. This creates a groove at the joint where the plastic-lined pipe is secured to the adjacent fitting. This often results in design flaws that can lead to chemical residue, impacting transport efficiency and purity.

[0004] Patent application number CN201810673204.X discloses an improved plastic-lined pipe, comprising a metal pipe and an inner plastic-lined pipe. Compared to the prior art, the plastic inner pipe of the plastic-lined pipe of the utility model is sealed and connected to the metal outer pipe via a rough surface and a sealing ring; adjacent plastic-lined pipes are sealed and connected via straight pipes or joints, and the adjacent plastic-lined pipes and connecting components are further fastened by clamps. The plastic-lined pipe is simple and easy to install, and the inner plastic pipe and the outer metal pipe, as well as the adjacent plastic-lined pipes, are tightly connected. Because the inner plastic-lined pipe is tightly connected to the outer metal pipe, the service life of the plastic-lined pipe is greatly improved when transporting media with a large temperature difference from the environment, saving pharmaceutical factories production costs and improving production efficiency. The pipe is easy to replace and flexible to assemble, and pharmaceutical manufacturers can adjust the length of the plastic-lined pipe and the materials of the metal and plastic pipes according to actual needs.

[0005] However, the above patented technology will also form grooves at the joints and cannot overcome the problem of chemical residues. Utility Model Content

[0006] The purpose of this utility model is to provide a new type of ultrapure chemical delivery pipeline to solve the problems raised in the above background technology:

[0007] (1) How to effectively reduce chemical residues during transportation and improve transportation efficiency and chemical purity by optimizing the design of plastic-lined pipe structure.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] A novel ultrapure chemical delivery pipeline comprises a metal outer tube and a plastic inner tube, wherein the plastic inner tube is sleeved inside the metal outer tube;

[0010] The end of the plastic inner tube extends outward from the metal outer tube in the axial direction of the metal outer tube, and the outer wall of the plastic inner tube outside the metal outer tube is fixedly connected to the injection molding layer along its circumferential direction, and the end surface of the injection molding layer away from the metal outer tube is flush with the end surface of the plastic inner tube;

[0011] In any cross section along the axis of the plastic inner tube, the inner wall of the plastic inner tube is perpendicular to the end face of the plastic inner tube and the end face of the injection molding layer.

[0012] On the basis of the above technical solution, the present invention can also be improved as follows.

[0013] Furthermore, the end of the metal outer tube is provided with a flange portion along its circumferential direction, and the injection molding layer is coated on the outside of the flange portion.

[0014] Furthermore, the metal outer tube includes a straight tube portion and at least one connecting tube portion, the straight tube portion is fixedly connected to the connecting tube portion, there is a gap between the inner wall of the connecting tube portion and the outer wall of the plastic inner tube, and the injection molding layer fills the gap between the connecting tube portion and the plastic inner tube.

[0015] Furthermore, a plurality of positioning holes are opened on the side wall of the connecting pipe portion, and the injection molding layer fills the spaces in the positioning holes.

[0016] With this structure, in any cross-section along the axis of the plastic inner tube, the inner wall of the plastic inner tube is perpendicular to both the end face of the plastic inner tube and the end face of the injection-molded layer. This means that there will be no chamfered or rounded corners between the end face of the plastic inner tube and the end face of the injection-molded layer. This allows for seamless connection of the plastic inner tubes of adjacent new ultra-pure chemical delivery pipelines when they are docked.

[0017] The beneficial effects of this new ultrapure chemical delivery pipeline are:

[0018] (1) No residue design: By optimizing the structural design of the connection, it is ensured that the chemicals will not remain inside the pipeline during the transportation process, thereby improving the purity of the chemicals.

[0019] (2) Efficient transportation: The smooth inner wall and the non-chamfered end face design reduce fluid resistance and improve transportation efficiency.

[0020] (3) Safe and reliable: The combined structure of metal outer tube and plastic inner tube not only ensures the strength of the pipeline, but also avoids the contamination of chemicals by metal, thus improving the safety of use.

[0021] (4) Easy to install and maintain: flange connection design simplifies the installation process, and facilitates subsequent maintenance and maintenance work. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the front view of the embodiment of the novel ultra-pure chemical conveying pipeline.

[0023] Figure 2 is Figure 1 the sectional view of

[0024] Figure 3 is Figure 2 the enlarged view of A of

[0025] Explanation of reference numerals in the drawing:

[0026] metal outer tube-100; straight pipe part-110; connecting pipe part-120; positioning hole-121; flange part-130; plastic inner tube-200; injection molding layer-300. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] Please refer to Figures 1 to 3 .

[0031] The novel ultra-pure chemical conveying pipeline comprises a metal outer tube 100 and a plastic inner tube 200.

[0032] The metal outer tube 100 comprises a straight tube part 110 and two connecting tube parts 120 welded on both sides of the straight tube part 110, the straight tube part 110 is welded and fixed with the connecting tube parts 120, the connecting tube parts 120 are in the shape of a trumpet mouth, and there is a gap between the inner wall of the connecting tube part 120 and the outer wall of the plastic inner tube 200, which is tightly filled by the injection molding layer 300 to isolate the potential influence of the external environment on the plastic inner tube 200, and a plurality of positioning holes 121 are formed in the side wall of the connecting tube part 120 along the circumferential direction thereof.

[0033] The metal outer tube 100 is provided with a flange part 130 on both sides, and the flange part 130 is welded and fixed with the end face of the connecting tube part 120 away from the straight tube part 110.

[0034] The plastic inner tube 200 is sleeved in the metal outer tube 100, the end part of the plastic inner tube 200 extends out of the metal outer tube 100 and the flange part 130 along the axial direction of the metal outer tube 100, the outer wall of the plastic inner tube 200 on the side away from the metal outer tube 100 is fixed with the injection molding layer 300 along the circumferential direction thereof, the end face of the injection molding layer 300 on the side away from the metal outer tube 100 is flush with the end face of the plastic inner tube 200, the injection molding layer 300 covers the outside of the flange part 130, the injection molding layer 300 fills the gap between the connecting tube part 120 and the plastic inner tube 200, and the injection molding layer 300 fills the space of the positioning hole 121. The injection molding layer 300 not only enhances the strength of the connection between the plastic inner tube 200 and the metal outer tube 100, but also ensures that the end face of the injection molding layer 300 on the side away from the metal outer tube 100 is flush with the end face of the plastic inner tube 200, forming a smooth transition and avoiding the accumulation of chemicals at this place.

[0035] In any cross section along the axial direction of the plastic inner tube 200, the inner wall of the plastic inner tube 200, the end face of the plastic inner tube 200 and the end face of the injection molding layer 300 are in a vertical relationship.

[0036] In any cross section along the axial direction of the plastic inner tube 200, the inner wall of the plastic inner tube 200, the end face of the plastic inner tube 200 and the end face of the injection molding layer 300 are in a vertical relationship, which ensures that the end faces of the plastic inner tubes 200 of two adjacent new type ultra-pure chemical conveying pipes can directly contact when the pipes are connected, and there is no chamfer or notch between them, thereby completely eliminating the possibility of chemical residue.

[0037] The method for preparing the new type ultra-pure chemical conveying pipe as described above comprises the following steps:

[0038] a) Select a corrosion-resistant plastic material that meets the requirements of the conveying medium, such as polytetrafluoroethylene (PTFE), polyethylene (PE), or polypropylene (PP), and form a plastic inner tube 200 through extrusion, injection molding, or other molding processes. Then, precisely fit the plastic inner tube 200 into the pre-prepared metal outer tube 100, ensuring a close but not excessive fit. The end of the plastic inner tube 200 extends axially beyond the metal outer tube 100 and the flange 130.

[0039] b) The assembled plastic inner tube 200 and metal outer tube 100 are placed together in a specially designed injection mold. The mold is adjusted so that the extended end of the plastic inner tube 200 rests precisely against the bottom surface of the mold, ensuring that the plastic layer evenly covers and tightly fits between the metal outer tube 100 and the plastic inner tube 200 during injection molding. At this point, a closed injection molding area is formed between the injection mold and the outer wall of the plastic inner tube 200. Next, a preheated, molten injection molding material, such as polyvinyl chloride (PVC) or epoxy resin, is injected into this injection molding area. High-pressure injection molding is used to fill the injection molding area and solidify the plastic, forming a solid injection molding layer 300. This injection molding layer 300 not only enhances the overall strength of the pipeline but also further improves its corrosion resistance and sealing properties.

[0040] c) Post-processing and testing:

[0041] After injection molding is complete, the new ultrapure chemical delivery pipeline is removed from the mold and subjected to necessary cooling, trimming, and inspection. Inspections include, but are not limited to, testing the pipeline's appearance, dimensional accuracy, sealing performance, and corrosion resistance to ensure the plastic-lined pipeline meets design requirements and industry standards.

[0042] The above is only one embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the principles of the present invention, and these should also be regarded as falling within the scope of protection of the present invention.

Claims

1. A novel ultrapure chemical delivery pipeline, comprising a metal outer tube (100) and a plastic inner tube (200), wherein the plastic inner tube (200) is sleeved inside the metal outer tube (100), and is characterized by: The end of the plastic inner tube (200) extends out of the metal outer tube (100) along the axial direction of the metal outer tube (100); the outer wall of the plastic inner tube (200) outside the metal outer tube (100) is fixedly connected to the injection molding layer (300) along its circumferential direction; the end surface of the injection molding layer (300) on the side away from the metal outer tube (100) is flush with the end surface of the plastic inner tube (200); In any cross section along the axial direction of the plastic inner tube (200), the inner wall of the plastic inner tube (200) and the end surface of the plastic inner tube (200) and the end surface of the injection molding layer (300) are all in a vertical relationship.

2. The novel ultrapure chemical delivery pipeline according to claim 1 is characterized by: The end of the metal outer tube (100) is provided with a flange portion (130) along its circumferential direction, and the injection molding layer (300) is coated on the outside of the flange portion (130).

3. The novel ultrapure chemical delivery pipeline according to claim 1 is characterized by: The metal outer tube (100) comprises a straight tube portion (110) and at least one connecting tube portion (120); the straight tube portion (110) is fixedly connected to the connecting tube portion (120); a gap is provided between the inner wall of the connecting tube portion (120) and the outer wall of the plastic inner tube (200); and the injection molding layer (300) completely fills the gap between the connecting tube portion (120) and the plastic inner tube (200).

4. The novel ultrapure chemical delivery pipeline according to claim 1 is characterized by: A plurality of positioning holes (121) are formed on the side wall of the connecting pipe portion (120), and the injection molding layer (300) fills the spaces in the positioning holes (121).

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