PTFE (Polytetrafluoroethylene) lined stainless steel bottle and manufacturing method thereof

Abstract

The invention 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, an inner cylinder body, an outer cylinder body and a sealing part, the body and the upper cover can be connected together in a sleeved mode, the body is arranged outside the inner cylinder in a sleeved mode from the bottom of the inner cylinder, the upper cover is arranged outside the inner cylinder in a sleeved mode from the top of the inner cylinder, and the outer cylinder is tightly attached to the inner cylinder; and the sealing cover covers the top of the cylinder body, and a valve and an inner extending pipe are arranged on the sealing cover. According to the stainless steel bottle, an integrally-formed inner cylinder is made of a PTFE material; grinding and polishing the stainless steel main body and the stainless steel upper cover; sleeving the main body and the upper cover on the inner cylinder; and welding the joint between the upper cover and the main body. For a small sealed container, the PTFE sealed container is manufactured in the mode that the inner cylinder and the outer cylinder are tightly connected in a sleeved mode, tight connection between the inner cylinder and the outer cylinder can be rapidly achieved, the inner cylinder is of an integral structure, no welding seam exists, therefore, the sealing performance is good, and the leakage risk can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of sealed containers, and in particular to a PTFE-lined stainless steel bottle and a manufacturing method thereof. Background Art

[0002] TMA is a high-risk chemical that is flammable and explosive, and has very high requirements on the corrosion resistance and sealing performance of the storage container. This equipment is used to store TMA and has better pressure resistance and sealing performance than existing equipment.

[0003] Most of the existing PTFE sealed containers adopt the structure of PTFE welded inner cylinder, and there are welds in the inner cylinder, which is very easy to cause gap leakage under high temperature and high pressure use environment. Specifically, when the existing large PTFE sealed containers are made, most of them are first made into a stainless steel outer cylinder, and then a porous plate is welded inside the outer cylinder, and then the PTFE inner cylinder is placed in the outer cylinder, and the inner cylinder is made to fit toward the inner wall of the outer cylinder by vacuuming. This method of making PTFE sealed containers is only suitable for large containers, and this method has a large number of welds and a high risk of leakage. In addition, the sealing structure of the existing equipment is also imperfect, and leakage will occur when the internal pressure is high. Summary of the invention

[0004] The present invention is intended to solve one of the problems existing in the background technology.

[0005] To this end, the present invention provides a PTFE-lined stainless steel bottle and a manufacturing method thereof, wherein the PTFE-lined stainless steel bottle and the manufacturing method thereof are suitable for small sealed containers.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A PTFE-lined stainless steel bottle, comprising:

[0008] A cylinder, the cylinder comprising:

[0009] An inner cylinder, wherein the inner cylinder is made of PTFE material;

[0010] An outer cylinder, the outer cylinder comprising a body and an upper cover which can be sleeved together, the body being sleeved outside the inner cylinder from the bottom of the inner cylinder, the upper cover being sleeved outside the inner cylinder from the top of the inner cylinder, and the outer cylinder being tightly fitted with the inner cylinder;

[0011] A sealing cover is arranged on the top of the cylinder body, and a valve and an inner extension tube are arranged on the sealing cover.

[0012] Furthermore, the sealing cover comprises 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 close to the flat cover, a limiting groove is arranged on the flat cover, and the top of the cylinder is embedded in the limiting groove.

[0013] Furthermore, the opening of the gland is arranged toward one side of the cylinder body, and the gland cover is arranged on the flat cover.

[0014] Furthermore, the valve and the inner extension tube are arranged on the flat cover, and the top of the pressure cover is provided with a through hole to make way for the valve.

[0015] Furthermore, the inner extension tube is threadedly connected to a side of the flat cover facing the cylinder body and extends into the cylinder body, and a sealing ring is arranged between the inner extension tube and the flat cover.

[0016] Furthermore, an anti-blocking structure is provided at the bottom of the inner extension tube.

[0017] A method for manufacturing a PTFE-lined stainless steel bottle comprises the following steps:

[0018] The one-piece inner cylinder is made of PTFE material;

[0019] The stainless steel body and stainless steel cover are cast separately;

[0020] Grind and polish the stainless steel body and stainless steel cover;

[0021] The main body is sleeved on the inner cylinder from the inside of the inner cylinder, and the upper cover is sleeved on the inner cylinder from the top of the inner cylinder;

[0022] Weld the connection between the upper cover and the main body.

[0023] Furthermore, during the welding process of the upper cover and the main body, the welding part is cooled down, and the cooling method is to fill water into the inner cylinder to cool it down or to air-cool the outside of the cylinder.

[0024] Furthermore, the inner wall of the outer cylinder is polished, and the roughness Ra after polishing is ≤ 0.4 μm.

[0025] Furthermore, the height of the welding angle between the upper cover and the main body is 1.5 mm.

[0026] The beneficial effect of the present invention is that, for a small sealed container, the present application adopts a method of closely sleeved inner and outer cylinders to manufacture a PTFE sealed container, which can quickly achieve a close connection between the inner and outer cylinders, and the inner cylinder is an integral structure, has no weld seams, and thus has good sealing performance, which can reduce the risk of leakage. At the same time, in the connection between the main body of the outer cylinder and the upper cover, a smaller welding angle height is used for welding, and no high heat is generated during the welding process, thereby reducing the impact on the inner cylinder, improving the overall quality of the cylinder, and improving the pressure resistance of the cylinder.

[0027] Furthermore, in the container, a multi-layer sealing structure is provided on the connection structure of the valve and at the connection between the inner extension tube and the flat cover, thereby improving the sealing performance of the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 It is a structural schematic diagram of the PTFE-lined stainless steel bottle of the present invention.

[0030] Figure 2 It is a structural schematic diagram of the sleeve connection relationship between the outer cylinder and the inner cylinder in the present invention.

[0031] Figure 3 It is a structural schematic diagram of the sealing cover in the present invention.

[0032] Figure 4 It is a structural schematic diagram of the inner extension tube in the present invention.

[0033] In the figure: 1. cylinder; 11. inner cylinder; 12. outer cylinder; 121. main body; 122. upper cover; 2. sealing cover; 21. pressure cover; 22. flat cover; 23. through port; 24. valve; 25. inner extension tube; 26. limit groove; 27. notch; 3. base. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] A PTFE-lined stainless steel bottle comprises a base 3, a barrel 1 and a sealing cover 2. The base 3 is connected to the bottom of the barrel 1. The barrel 1 comprises an inner barrel 11 and an outer barrel 12. The outer barrel 12 is made of stainless steel, and the inner barrel 11 is made of PTFE. The outer barrel 12 is sleeved on the inner barrel 11, and the outer barrel 12 and the inner barrel 11 are tightly attached to each other.

[0038] It should be noted that the outer cylinder 12 includes a main body and an upper cover 122 , the openings of the main body and the upper cover 122 are opposite and sleeved together, and specifically, the main body expands outward toward the edge of the upper cover 122 so that the edge portion of the upper cover 122 can be inserted.

[0039] 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. 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 arranged toward one side of the cylinder 1. The pressure cover 21 is covered on the flat cover 22. The flat cover 22 is connected with a valve 24 and an inner extension tube 25. The top of the pressure cover 21 is provided with a through hole 23 for making way for the valve 24.

[0040] The bottom of the valve 24 has a conical structure. The valve 24 is threadedly connected 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, forming a first seal; an O-ring is also installed between the threaded port of the valve 24 and the seat of the valve 24 to form a second seal; the two sealing structures can effectively reduce the occurrence of leakage. The inner extension tube 25 is integrally formed with rod material. The inner extension tube 25 is connected to the flat cover 22 using a threaded structure. An O-ring is arranged between the inner extension tube 25 and the flat cover 22 to enhance the sealing performance; the bottom of the inner extension tube 25 is provided with an anti-blocking structure, which is a plurality of notches 27 arranged at the end of the inner extension tube 25. The notches 27 are arranged circumferentially along the inner extension tube 25, which can increase the contact area with the liquid and prevent clogging when impurities accumulate at the bottom; when the bottom tube touches the bottom, the side hole can also discharge liquid to reduce clogging.

[0041] A method for manufacturing a PTFE-lined stainless steel bottle comprises the following steps:

[0042] Step 1: making the inner cylinder 11. The inner cylinder 11 is formed in one piece by compression molding of PTFE material, thereby reducing welding seams, avoiding the possibility of welding seam leakage, and increasing the pressure resistance of the cylinder body 1.

[0043] Step 2: Make the outer cylinder 12, the main body and the upper cover 122 are made of 316L stainless steel.

[0044] Step three, polishing. In order to smoothly fit with the PTFE inner cylinder 11, the inner wall of the outer cylinder 12 needs to be polished. The roughness after polishing is Ra≤0.4μm. The smooth inner wall can prevent the PTFE inner cylinder 11 from being scratched.

[0045] Step 4, fitting welding, the upper cover 122 and the main body are fitted together and sealed by welding, and the weld angle height is 1.5 mm. In order not to damage the internal PTFE lining during welding, the cylinder 1 needs to be cooled. The cooling method includes but is not limited to filling water into the inner cylinder 11 and air cooling on the outside of the cylinder 1. In this application, the weld angle height is relatively small, and will not generate too much heat and will not damage the inner cylinder 11.

[0046] In summary, for small sealed containers, the present application adopts the method of tightly sleeved inner and outer cylinders 12 to manufacture PTFE sealed containers. This method can quickly achieve a tight connection between the inner and outer cylinders 12. The inner cylinder 11 is an integral structure without welds, so the sealing is good and the risk of leakage can be reduced. At the same time, in the connection between the main body 121 of the outer cylinder 12 and the upper cover 122, a smaller welding angle height is used for welding, and no high heat is generated during the welding process, thereby reducing the impact on the inner cylinder 11, improving the overall quality of the cylinder 1, and improving the pressure resistance of the cylinder 1.

[0047] Furthermore, in the container, a multi-layer sealing structure is provided on the connection structure of the valve 24 and the connection between the inner extension tube 25 and the flat cover 22, thereby improving the sealing performance of the container.

[0048] Furthermore, in the design of the inner extension tube 25, the present application provides a multi-notch structure 27 at the tube mouth, thereby expanding the contact area between the tube mouth of the inner extension tube 25 and the liquid, which can prevent clogging due to accumulation of impurities at the bottom. When the bottom tube touches the bottom, liquid can also flow out of the notch 27 to reduce clogging.

[0049] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A PTFE lined stainless steel bottle, characterized in that: include, A cylinder (1), wherein the cylinder (1) comprises: An inner cylinder (11), wherein the inner cylinder (11) is made of PTFE material; An outer cylinder (12), the outer cylinder (12) comprising a body (121) and an upper cover (122) which can be sleeved together, the body (121) being sleeved outside the inner cylinder (11) from the bottom of the inner cylinder (11), the upper cover (122) being sleeved outside the inner cylinder (11) from the top of the inner cylinder (11), the outer cylinder (12) and the inner cylinder (11) being tightly fitted; A sealing cover (2) is arranged on the top of the cylinder (1), and a valve (24) and an inner extension tube (25) are arranged on the sealing cover (2).

2. The PTFE-lined stainless steel bottle according to claim 1, characterized in that: The sealing cover (2) comprises a flat cover (22) and a pressure cover (21); the outer edge of the flat cover (22) is flush with the outer wall of the outer cylinder (12) close to 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 cover (21) is arranged toward one side of the cylinder (1), and the pressure cover (21) is covered on the flat cover (22).

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

5. The PTFE-lined stainless steel bottle according to claim 2, characterized in that: The inner extension tube (25) is threadedly connected 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 extension 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 extension tube (25) is provided with an anti-blocking structure.

7. A method for manufacturing a PTFE-lined stainless steel bottle as claimed in any one of claims 1 to 6, characterized in that: The following steps are included: An inner cylinder (11) is made of PTFE material and is integrally formed; Casting a stainless steel body and a stainless steel upper cover (122) respectively; Grinding and polishing the stainless steel body and the stainless steel upper cover (122); The main body is sleeved on the inner cylinder (11) from the inside of the inner cylinder (11), and the upper cover (122) is sleeved on the inner cylinder (11) from the top of the inner cylinder (11); The connection between the upper cover (122) and the main body is welded.

8. The method for manufacturing a PTFE-lined stainless steel bottle according to claim 7, characterized in that: During the welding process of the upper cover (122) and the main body, the welding part is cooled by filling water into the inner cylinder (11) for cooling or by air cooling outside 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 ≤ 0.4 μm.

10. The method for manufacturing a PTFE-lined stainless steel bottle according to claim 7, characterized in that: The height of the welding angle at the welding point between the upper cover (122) and the main body is 1.5 mm.

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