PTFE-lined stainless steel bottle and method of making same

Abstract

The application relates to the technical field of sealed containers, in particular to a PTFE-lined stainless steel bottle and a manufacturing method thereof. The PTFE-lined stainless steel bottle comprises a cylinder body, wherein the cylinder body comprises an inner cylinder made of PTFE material and an outer cylinder capable of being sleeved together, the body is sleeved outside the inner cylinder from the bottom of the inner cylinder, the upper cover is sleeved outside the inner cylinder from the top of the inner cylinder, and the outer cylinder is tightly combined with the inner cylinder; a sealing cover is arranged on the top of the cylinder body, and a valve and an inner extension pipe are arranged on the sealing cover. The stainless steel bottle is manufactured by adopting PTFE material to form an integrated inner cylinder; the stainless steel body and the stainless steel upper cover are polished; the body and the upper cover are sleeved on the inner cylinder; and the connecting part between the upper cover and the body is welded. The application is aimed at small sealed containers, the PTFE sealed container is manufactured by adopting the tightly sleeved mode of the inner and outer cylinders, the tightly sleeved mode can quickly realize the tight connection between the inner and outer cylinders, the inner cylinder is an integral structure without welding seams, the sealing performance is good, and the leakage risk can be reduced.

Description

Technical Field

[0001] This application relates to the field of sealed container technology, and in particular to a PTFE-lined stainless steel bottle and its manufacturing method. Background Technology

[0002] TMA is a highly hazardous chemical that is flammable and explosive, requiring storage containers with high corrosion resistance and sealing performance. This equipment is used to store TMA and has better pressure resistance and sealing performance compared to existing equipment.

[0003] Most existing PTFE sealed containers use a PTFE welded inner cylinder structure, which contains weld seams. Under high temperature and pressure conditions, these seams are prone to leakage. Specifically, existing large PTFE sealed containers are mostly manufactured by first creating a stainless steel outer cylinder, then welding a perforated plate inside the outer cylinder, and finally placing the PTFE inner cylinder inside. A vacuum is then applied to bring the inner cylinder into contact with the inner wall of the outer cylinder. This manufacturing method is only suitable for large containers, and the numerous weld seams increase the risk of leakage. Furthermore, the sealing structure of existing equipment is not perfect, and leakage can occur when the internal pressure is high. Summary of the Invention

[0004] This invention aims to solve one of the problems existing in the background art.

[0005] Therefore, the present invention provides a PTFE-lined stainless steel bottle and a method for manufacturing the same, which is suitable for small sealed containers.

[0006] The technical solution adopted by this invention to solve its technical problem is: A PTFE-lined stainless steel bottle, comprising, The cylindrical body includes: Inner cylinder, wherein the inner cylinder is made of PTFE material; The outer cylinder includes a body and a top cover that can be nested together. The body is fitted over the inner cylinder from the bottom and the top cover is fitted over the inner cylinder from the top. The outer cylinder and the inner cylinder fit tightly together. A sealing cap is provided on the top of the cylinder, and the sealing cap is equipped with a valve and an inner extension pipe.

[0007] Furthermore, the sealing cover includes a flat cover and a pressure cover. The outer edge of the flat cover is flush with the outer side wall of the outer cylinder near the flat cover. A limiting groove is provided on the flat cover, and the top of the cylinder is embedded in the limiting groove.

[0008] Furthermore, the opening of the pressure cap is positioned facing one side of the cylinder, and the pressure cap is placed on the flat cover.

[0009] Furthermore, the valve and the inner extension tube are mounted on the flat cover, and the top of the cover is provided with an opening to allow space for the valve.

[0010] Furthermore, the inner extension tube is threaded onto the side of the flat cover facing the cylinder and extends into the cylinder, and a sealing ring is provided between the inner extension tube and the flat cover.

[0011] Furthermore, the bottom of the inner tube is provided with an anti-clogging structure.

[0012] A method for manufacturing a PTFE-lined stainless steel bottle includes the following steps: The inner cylinder is made of PTFE material and is molded in one piece. The stainless steel body and stainless steel top cover are cast separately. Grinding and polishing the stainless steel body and stainless steel top cover; The main body is fitted onto the inner cylinder from the inside, and the top cover is fitted onto the inner cylinder from the top. Weld the connection between the top cover and the body.

[0013] Furthermore, during the welding process between the upper cover and the body, the welded part is cooled down by filling the inner cylinder with water or by air cooling outside the cylinder.

[0014] Furthermore, the inner wall of the outer cylinder is polished, and the roughness Ra after polishing is ≤0.4μm.

[0015] Furthermore, the weld bead height at the weld between the top cover and the body is 1.5mm.

[0016] The beneficial effects of this invention are that, for small sealed containers, this application uses a method of tightly fitting inner and outer cylinders to manufacture PTFE sealed containers. This method can quickly achieve a tight connection between the inner and outer cylinders. The inner cylinder is a single integral structure without welds, resulting in good sealing performance and reducing the risk of leakage. Simultaneously, the connection between the outer cylinder body and the top cover uses a small weld bead height, which does not generate high heat during the welding process, thereby reducing the impact on the inner cylinder, improving the overall quality of the cylinder, and enhancing its pressure resistance.

[0017] Furthermore, the container incorporates multi-layered sealing structures at the valve connection points and the connection between the inner tube and the flat cover, thereby improving the container's sealing performance. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the PTFE-lined stainless steel bottle in this invention.

[0020] Figure 2 This is a schematic diagram of the connection between the outer cylinder and the inner cylinder in this invention.

[0021] Figure 3 This is a schematic diagram of the sealing cap structure in this invention.

[0022] Figure 4 This is a schematic diagram of the inner tube structure in this invention.

[0023] In the diagram: 1. Cylinder; 11. Inner cylinder; 12. Outer cylinder; 121. Body; 122. Top cover; 2. Sealing cover; 21. Pressure cover; 22. Flat cover; 23. Port; 24. Valve; 25. Inner extension pipe; 26. Limiting groove; 27. Notch; 3. Base. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] A PTFE-lined stainless steel bottle includes a base 3, a cylindrical body 1, and a sealing cap 2. The base 3 is connected to the bottom of the cylindrical body 1. The cylindrical body 1 includes an inner cylinder 11 and an outer cylinder 12. The outer cylinder 12 is made of stainless steel, and the inner cylinder 11 is made of PTFE. The outer cylinder 12 is fitted onto the inner cylinder 11, and the outer cylinder 12 and the inner cylinder 11 are tightly attached to each other.

[0028] It should be noted that the outer cylinder 12 includes a body 121 and an upper cover 122. The openings of the body 121 and the upper cover 122 are opposite to each other and are fitted together. Specifically, the body 121 is extended outward toward the edge of the upper cover 122 so that the edge part of the upper cover 122 can be inserted.

[0029] The sealing cover 2 includes a flat cover 22 and a pressure cover 21. The outer edge of the flat cover 22 is flush with the outer side wall of the outer cylinder 12 near the flat cover 22. The flat cover 22 is provided with a limiting groove 26. The top of the cylinder 1 is embedded in the limiting groove 26. An O-ring is provided between the cylinder 1 and the flat cover 22. The opening of the pressure cover 21 is provided facing one side of the cylinder 1. The pressure cover 21 covers the flat cover 22. A valve 24 and an inner extension pipe 25 are connected to the flat cover 22. The top of the pressure cover 21 is provided with a through port 23 to allow space for the valve 24.

[0030] The valve 24 has a tapered structure at the bottom and is threaded to the flat cover 22. When screwed into the threaded seat of the flat cover 22, it can cooperate with the internal structure of the upper cover 122 to form a ferrule structure, creating the first seal. An O-ring is also installed between the threaded end of the valve 24 and the seat of the valve 24, forming the second seal. The two sealing structures can effectively reduce leakage. The inner tube 25 is integrally formed from bar stock and is threaded to the flat cover 22. An O-ring is provided between the inner tube 25 and the flat cover 22 to enhance the sealing performance. The bottom of the inner tube 25 is provided with an anti-clogging structure, which consists of multiple notches 27 at the end of the inner tube 25. The notches 27 are arranged circumferentially around the inner tube 25 to increase the contact area with the liquid and prevent clogging when impurities accumulate at the bottom. When the bottom tube touches the bottom, liquid can also exit through the side hole, reducing clogging.

[0031] A method for manufacturing a PTFE-lined stainless steel bottle includes the following steps: Step 1: Fabricate the inner cylinder 11. The inner cylinder 11 is integrally molded using PTFE material compression molding, which reduces welding seams, avoids the possibility of weld leakage, and increases the pressure resistance of the cylinder 1.

[0032] Step 2: Make the outer cylinder 12. The body 121 and the top cover 122 are both made of 316L stainless steel.

[0033] Step 3, polishing. In order to fit smoothly with the PTFE inner cylinder 11, the inner wall of the outer cylinder 12 needs to be polished. After polishing, the roughness Ra≤0.4μm. The smooth inner wall can prevent the PTFE inner cylinder 11 from being scratched.

[0034] Step four, fitting and welding: After fitting the upper cover 122 and the body 121 together, seal the weld with a weld height of 1.5mm. During welding, in order not to damage the internal PTFE lining, the cylinder 1 needs to be cooled. Cooling methods include, but are not limited to, filling the inner cylinder 11 with water or air cooling the outside of the cylinder 1. In this application, the weld height is small and will not generate too much heat, so it will not damage the inner cylinder 11.

[0035] In summary, for small sealed containers, this application employs a method of tightly fitting inner and outer cylinders 12 to manufacture PTFE sealed containers. This method enables rapid and tight connection between the inner and outer cylinders 12. The inner cylinder 11 is a single integral structure without welds, resulting in good sealing performance and reducing the risk of leakage. Simultaneously, the connection between the body 121 of the outer cylinder 12 and the top cover 122 is achieved using a smaller weld bead height, minimizing heat generation during welding and thus reducing the impact on the inner cylinder 11. This improves the overall quality of the cylinder 1 and enhances its pressure resistance.

[0036] Furthermore, the container is equipped with a multi-layer sealing structure on the connection structure of valve 24 and at the connection between inner tube 25 and flat cover 22, thereby improving the sealing performance of the container.

[0037] Furthermore, in the design of the inner tube 25, this application provides a multi-slot structure 27 at the tube opening, thereby increasing the contact area between the inner tube 25 opening and the liquid. This can prevent blockage when impurities accumulate at the bottom. When the bottom tube touches the bottom, liquid can also flow out through the slot 27, reducing blockage.

[0038] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A PTFE-lined stainless steel bottle, characterized in that, include, Cylinder (1), the cylinder (1) comprising: Inner cylinder (11), wherein the inner cylinder (11) is integrally formed of PTFE material; The outer cylinder (12) includes a body (121) and a top cover (122) that can be nested together. The body (121) is fitted over the inner cylinder (11) from the bottom, and the top cover (122) is fitted over the inner cylinder (11) from the top. The outer cylinder (12) and the inner cylinder (11) are tightly fitted together. The body (121) extends outward toward the edge of the upper cover (122) to allow the edge portion of the upper cover (122) to be inserted; The main body (121) and the upper cover (122) are welded and sealed after being fitted together, and the weld height at the weld is 1.5mm. The welded part is cooled during the welding process between the upper cover (122) and the main body (121). A sealing cover (2) is provided on the top of the cylinder (1), and a valve (24) and an inner extension pipe (25) are provided on the sealing cover (2).

2. The PTFE-lined stainless steel bottle according to claim 1, characterized in that, The sealing cover (2) includes a flat cover (22) and a pressure cover (21). The outer edge of the flat cover (22) is flush with the outer side wall of the outer cylinder (12) near the flat cover (22). A limiting groove (26) is provided on the flat cover (22), and the top of the cylinder (1) is embedded in the limiting groove (26).

3. The PTFE-lined stainless steel bottle according to claim 2, characterized in that, The opening of the pressure cap (21) is provided on one side facing the cylinder (1), and the pressure cap (21) covers the flat cap (22).

4. The PTFE-lined stainless steel bottle according to claim 2, characterized in that, The valve (24) and the inner tube (25) are mounted on the flat cover (22), and the top of the pressure cap (21) is provided with a port (23) to make way for the valve (24).

5. The PTFE-lined stainless steel bottle according to claim 2, characterized in that, The inner tube (25) is threaded to the side of the flat cover (22) facing the cylinder (1) and extends into the cylinder (1). A sealing ring is provided between the inner tube (25) and the flat cover (22).

6. The PTFE-lined stainless steel bottle according to claim 1, characterized in that, The bottom of the inner tube (25) is provided with an anti-clogging structure.

7. A method for manufacturing a PTFE-lined stainless steel bottle as described in any one of claims 1-6, characterized in that, Includes the following steps, The inner cylinder (11) is made of PTFE material and is integrally molded; the stainless steel body (121) and the stainless steel top cover (122) are cast separately. The stainless steel body (121) and the stainless steel top cover (122) are ground and polished; The main body (121) is fitted onto the inner cylinder (11) from the inside, and the top cover (122) is fitted onto the inner cylinder (11) from the top. Weld the connection between the top cover (122) and the body (121).

8. The method for manufacturing a PTFE-lined stainless steel bottle according to claim 7, characterized in that, The cooling method is to fill the inner cylinder (11) with water for cooling or to air cool the outside of the cylinder (1).

9. The method for manufacturing a PTFE-lined stainless steel bottle according to claim 7, characterized in that, The inner wall of the outer cylinder (12) is polished, and the roughness Ra after polishing is ≤0.4μm.

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