Inner container processing method

Abstract

The invention belongs to the technical field of water heaters, and particularly discloses an inner container machining method. The inner container machining method comprises the following steps that an outer container body is made of a rigid material, one end of the outer container body is closed, the other end of the outer container body is provided with an end opening, and a pipe joint communicating with the interior of the outer container body is arranged on the side wall of the outer container body; an exhaust tool is installed at the pipe joint in a sealed mode, part of the exhaust tool extends into the outer container body, an exhaust channel is formed in the exhaust tool in a penetrating mode, and the inner diameter of the exhaust channel is smaller than that of the pipe joint; a plastic container body is formed in the outer container body in a blow molding mode, and the outer wall face of the plastic container body is attached to the inner wall face of the outer container body. By means of the inner container machining method, the risk of water leakage of the inner container can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of water heaters, and in particular to an inner tank processing method. Background Art

[0002] The prior art provides a composite liner, including a metal liner (outer liner) and a plastic liner, wherein the plastic liner is formed by blow molding inside the metal liner, wherein a through opening is formed by cutting, and a pipe joint is sealed and installed at the through opening, and the pipe joint is used to install components such as a water inlet pipe. In the existing process, the through opening is usually closed first, and an exhaust hole is opened on the side wall of the metal liner for exhaust, which increases the risk of water leakage in the liner. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a liner processing method, which can reduce the risk of water leakage of the liner.

[0004] The above technical problems are solved by the following technical solutions:

[0005] A method for processing an inner liner is provided, comprising the following steps:

[0006] The outer bladder body is made of rigid material, one end of the outer bladder body is closed and the other end has an end opening, and the side wall of the outer bladder body is provided with a pipe joint connected to the inside of the outer bladder body;

[0007] An exhaust tool is sealed and installed at the pipe joint, wherein the exhaust tool portion extends into the outer liner body, and an exhaust channel is provided through the exhaust tool, and the inner diameter of the exhaust channel is smaller than the inner diameter of the pipe joint;

[0008] A plastic bladder body is blow-molded in the outer bladder body, and the outer wall surface of the plastic bladder body is in contact with the inner wall surface of the outer bladder body.

[0009] Compared with the background technology, the inner liner processing method of the present invention has the following beneficial effects:

[0010] By installing an exhaust tool at the pipe joint set on the side wall of the outer bladder body, the exhaust tool is used to exhaust during the process of blow molding the outer bladder body to form a plastic bladder body. The inner diameter of the exhaust channel is small, which can effectively avoid the problem of excessive exhaust, thereby maintaining sufficient blow molding pressure, so that the outer wall surface of the plastic bladder body can better fit the inner wall surface of the outer bladder body. By setting the exhaust tool, exhaust can be achieved at the pipe joint of the inner bladder, and there is no need to open an exhaust hole on the outer bladder body, thereby effectively reducing the risk of water leakage in the inner bladder.

[0011] In one embodiment, blow molding a plastic bladder body within the outer bladder body comprises:

[0012] Melting the raw materials to obtain a molten material, and making the molten material into a plastic gallbladder blank;

[0013] The plastic bladder blank is placed in the outer bladder body and blow-molded to form the plastic bladder body.

[0014] In one of the embodiments, when the plastic bladder body is formed by blow molding, gas with a preset blow molding pressure is introduced into the plastic bladder blank, and the preset blow molding pressure is 0.5MPa to 0.9MPa.

[0015] In one of the embodiments, when the plastic bladder body is formed by blow molding, a gas with a preset blow molding temperature is introduced into the plastic bladder blank, and the preset blow molding temperature is 150°C to 190°C.

[0016] In one embodiment, when the plastic bladder is blow-molded, the blowing time is 540S to 660S.

[0017] In one of the embodiments, the exhaust tooling includes a mounting portion and an extension portion which are sequentially arranged along the axial direction and interconnected, the exhaust passage passes through the mounting portion and the extension portion, the mounting portion is detachably connected to the pipe joint, and when the exhaust tooling is installed to the pipe joint, the extension portion extends into the outer liner body, the extension portion protrudes from the inner wall of the inner liner, and there is a gap between the outer side wall of the extension portion and the inner wall of the pipe joint.

[0018] In one embodiment, after the plastic bladder is formed by blow molding, the method further comprises:

[0019] After the plastic bladder is cooled and shaped, the exhaust tooling is disassembled;

[0020] The coating layer formed on the inner wall of the pipe joint of the plastic bladder is smoothed.

[0021] In one embodiment, while waiting for the plastic bladder to cool and set, the cooling time is 450S to 550S.

[0022] In one embodiment, the lower end surface of the pipe joint has a first step portion, and the coating layer fills the first step portion.

[0023] In one embodiment, the pipe joint includes a sewage pipe joint and a drainage pipe joint, and the exhaust fixture includes a first exhaust fixture for connecting the sewage pipe joint and a second exhaust fixture for connecting the drainage pipe joint, wherein an extension length of the second exhaust fixture in the outer shell body is greater than an extension length of the first exhaust fixture in the outer shell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1A schematic diagram of a process flow of a liner processing method provided by an embodiment of the present invention;

[0025] Figure 2 A structural cross-sectional view of an inner container provided by an embodiment of the present invention;

[0026] Figure 3 A structural cross-sectional view of an inner tank installation exhaust tooling provided in an embodiment of the present invention;

[0027] Figure 4 for Figure 3 A partial enlarged schematic diagram of part A;

[0028] Figure 5 A schematic diagram of the structure of the exhaust tooling for installing the inner tank provided in an embodiment of the present invention.

[0029] Description of labels:

[0030] 1. Outer liner; 11. End opening; 2. Pipe joint; 21. Connecting hole; 22. First step portion; 23. Second step portion; 24. Drain pipe joint; 25. Sewage pipe joint; 3. Exhaust fixture; 31. Exhaust channel; 32. Mounting portion; 33. Extension portion; 34. First exhaust fixture; 35. Second exhaust fixture; 4. Plastic liner; 41. Coating layer. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In the description of the present application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] The terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0034] In the description of this application, 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 this application can be understood according to specific circumstances.

[0035] like Figure 1-Figure 5 As shown, an embodiment of the present invention first provides an inner tank processing method, which can be used to prepare the inner tank in a water heater.

[0036] The liner processing method comprises the following steps:

[0037] Step S100, an outer bladder body 1 is prepared by using a rigid material, one end of the outer bladder body 1 is closed and the other end has an end opening 11, and a side wall of the outer bladder body 1 is provided with a pipe joint 2 connected to the inside of the outer bladder body 1;

[0038] Step S200, sealingly installing the exhaust tool 3 at the pipe joint 2, the exhaust tool 3 partially extending into the outer liner body 1, the exhaust tool 3 is penetrated by an exhaust channel 31, and the inner diameter of the exhaust channel 31 is smaller than the inner diameter of the pipe joint 2;

[0039] Step S300 , blow molding is performed inside the outer bladder body 1 to form a plastic bladder body 4 , and the outer wall surface of the plastic bladder body 4 is in contact with the inner wall surface of the outer bladder body 1 .

[0040] The inner liner processing method provided in this embodiment is to open a through hole on the side wall of the outer liner body 1, set a pipe joint 2 at the through hole, and connect the pipe joint 2 to the pipe joint 2 through an exhaust tool 3 so as to be inserted into the pipe joint 2. In the process of blow molding the outer liner body 1 to form a plastic liner body 4, the exhaust tool 3 is used to exhaust the gas in the inner liner. The inner diameter of the exhaust channel 31 is relatively small, which can effectively avoid the problem of excessive exhaust, thereby maintaining sufficient blow molding pressure, so that the outer wall surface of the plastic liner body 4 can better fit the inner wall surface of the outer liner body 1. By setting the exhaust tool 3, exhaust can be achieved at the pipe joint 2 of the inner liner, and there is no need to open another exhaust hole on the outer liner body 1, thereby effectively reducing the risk of water leakage in the inner liner. It can be understood that the pipe joint 2 is used to install components such as water inlet pipes and water outlet pipes.

[0041] In this embodiment, the rigid material used to prepare the outer liner 1 includes but is not limited to metal, ceramic, titanium, crystal and other materials with strong structural stability and strong pressure resistance. Preferably, the material of the outer liner 1 is metal, and the preparation process of the metal liner belongs to the prior art, which will not be described in detail in this embodiment.

[0042] Blow molding the plastic bladder body 4 in the outer bladder body 1 includes:

[0043] Step S1001, melting the raw materials to obtain a melt, and making the melt into a plastic gallbladder blank;

[0044] Step S1002: placing the plastic gallbladder blank in the outer gallbladder body 1 and blow-molding the plastic gallbladder body 4.

[0045] The above raw materials include but are not limited to the common raw materials for blow molding such as polypropylene, polyester, polyvinyl chloride, etc., which have good mechanical properties, chemical stability and corrosion resistance. The preparation of the plastic gallbladder blank can be prepared by extrusion molding or injection molding technology, and the extrusion molding or injection molding technology can be carried out with reference to the prior art, and this embodiment will not be repeated here. It is understandable that the plastic gallbladder blank is placed in the outer gallbladder body 1 from the end opening 11.

[0046] When the plastic bladder body 4 is formed by blow molding, gas with a preset blow molding pressure is introduced into the plastic bladder blank, and the preset blow molding pressure is 0.5MPa to 0.9MPa.

[0047] When the plastic bladder body 4 is formed by blow molding, a gas having a preset blow molding temperature is introduced into the interior of the plastic bladder blank, and the preset blow molding temperature is 150°C to 190°C. In this way, the blow molding gas at this temperature is used to keep the plastic bladder blank in a soft state during the blow molding process, which is convenient for blow molding and is conducive to forming a plastic bladder body 4 with uniform wall thickness. The blow molding gas used for blow molding is an inert gas to avoid chemical reaction between the blow molding gas and the plastic bladder blank. For example, a gas having a preset blow molding temperature of 180°C can be used.

[0048] When the plastic bladder body 4 is blow-molded, the blow-molding time is 540S to 660S. For example, the blow-molding time is 600S to ensure that the outer wall surface of the plastic bladder body 4 is completely in contact with the inner wall surface of the outer bladder body 1.

[0049] In one embodiment, the exhaust tool 3 includes a mounting portion 32 and an extension portion 33 which are sequentially arranged and interconnected along the axial direction, and an exhaust passage 31 runs through the mounting portion 32 and the extension portion 33. The mounting portion 32 is detachably connected to the pipe joint 2. When the exhaust tool 3 is installed to the pipe joint 2, the extension portion 33 extends into the outer bladder body 1, and the extension portion 33 protrudes from the inner wall of the inner bladder. There is a gap between the outer wall of the extension portion 33 and the inner wall of the pipe joint 2. In the process of blowing the plastic bladder blank placed in the outer bladder body 1 by injecting blow molding gas, the gas in the outer bladder body 1 is discharged through the exhaust passage 31 of the exhaust tool 3, so as to prevent the gas between the outer bladder body 1 and the plastic bladder blank from hindering the expansion of the plastic bladder blank. Moreover, the exhaust channel 31 can effectively avoid the problem of too fast exhaust. The gradually expanding plastic gallbladder blank will contact the exhaust tooling 3 and be penetrated by the exhaust tooling 3 to form a connecting port. Part of the blow molding gas enters the exhaust channel 31 of the exhaust tooling 3 through the connecting port and is discharged, ensuring that the remaining gas in the plastic gallbladder blank maintains sufficient blow molding pressure, which is conducive to the plastic gallbladder blank to quickly fit the inner wall surface of the outer gallbladder body 1, and protrude from the inner wall of the inner gallbladder through the extension part 33. During blow molding, a coating layer 41 can be formed between the outer wall of the extension part 33 and the inner wall of the pipe joint 2.

[0050] In one embodiment, the inner diameter of the exhaust passage 31 is 4 mm.

[0051] As the blow molding process proceeds, part of the plastic bladder blank is squeezed into the gap from the connecting port under the pressure of the blow molding gas and forms a coating layer 41. The coating layer 41 is formed on the inner wall of the pipe joint 2, which reduces the exposed area of ​​the pipe joint 2, reduces the corrosion problem caused by the contact between the pipe joint 2 and the water body after long-term use, and improves the corrosion resistance and service life of the pipe joint 2; furthermore, the coating layer 41 not only covers the pipe joint 2, but also covers the gap between the pipe joint 2 and the through port, so as to prevent the water stored in the plastic bladder body 4 from leaking through the connection, thereby improving the sealing and thermal insulation of the inner bladder.

[0052] After the plastic bladder body 4 is formed, the exhaust tooling 3 can be removed. The exhaust tooling 3 can be reused, which is more environmentally friendly.

[0053] In order to control the extension length of the coating layer 41, the lower end face of the pipe joint 2 abuts the end face of the extension part 33. The end face of the extension part 33 is used to close one end of the gap. The end face of the extension part 33 restricts the volume of the plastic blank squeezed into the gap. When part of the plastic blank is squeezed into the gap from the connecting port under the action of the blow molding pressure, it stops flowing after abutting the end face of the extension part 33 and is formed, ensuring that the coating layer 41 covers the inner wall of the entire pipe joint 2 along the axial length of the connecting hole 21.

[0054] For example, Figure 4 and Figure 5As shown, in one embodiment, the mounting portion 32 and the pipe joint 2 are connected by threads. When the pipe joint 2 is internally threaded, the mounting portion 32 is adapted to form an external thread, and the mounting portion 32 is threadedly connected to the inside of the pipe joint 2; when the pipe joint 2 is externally threaded, the mounting portion 32 is adapted to form an internal thread, and the mounting portion 32 is sleeve-mounted and wrapped around the outside of the pipe joint 2. The thread disassembly and assembly method is relatively simple, and will not affect the matching relationship between the extension portion 33 and the connecting hole 21.

[0055] It should be noted that for the mounting portion 32 that needs to adapt to the thread of the pipe joint 2 and adopts a different structure, the setting position of the end face of the extension portion 33 used to close one end of the gap is different. The end face of the extension portion 33 abuts against the lower end face of the pipe joint 2, and the lower end face of the pipe joint 2 is the position for abutting against the end face of the external pipeline.

[0056] After the plastic bladder body 4 is formed by blow molding, the following steps are also included:

[0057] Step S301, after the plastic bladder body 4 is cooled and shaped, the exhaust tooling 3 is disassembled;

[0058] Step S302 , smoothing the coating layer 41 formed on the inner wall of the plastic bladder body 4 at the pipe joint 2 .

[0059] The disassembly of the pipe joint 2 needs to wait until the plastic bladder body 4 is fully cooled and shaped. In one embodiment, while waiting for the plastic bladder body 4 to cool and shape, the cooling time is controlled at 450 seconds to 550 seconds to ensure that the coating layer 41 completely fits the pipe joint 2 and shapes, and avoids deformation of the coating layer 41 caused by disassembly of the pipe joint 2. Exemplarily, the cooling time is 600S. It can be understood that when the external pipeline components such as the water inlet pipe are subsequently assembled, the end face of the coating layer 41 is tightly attached to the end face of the water inlet pipe, or the end face of the coating layer 41 is tightly attached to the sealing ring on the water inlet pipe, which can improve the sealing performance, that is, by providing the coating layer 41 and smoothing the coating layer 41 to improve its surface accuracy, it can effectively prevent water from penetrating between the external bladder body 1 and the plastic bladder body 4.

[0060] The lower end surface of the pipe joint 2 has a first step portion 22, the step surface of the first step portion 22 extends to the communicating hole 21, and the coating layer 41 fills the first step portion 22. The coating layer 41 forms an L-shaped structure, which, on the one hand, increases the contact area with the pipe joint 2 to avoid the separation of the pipe joint 2 and the coating layer 41 to form a gap, and on the other hand, reduces the end surface area of ​​the pipe joint 2 to improve the sealing performance of the pipe joint 2 connected to the external pipeline.

[0061] The upper end surface of the pipe joint 2 has a second step portion 23, and the step surface of the second step portion 23 extends to the outer side surface of the pipe joint 2. The pipe joint 2 is embedded in the through opening and the side wall of the outer bladder body 1 overlaps the second step portion 23. This overlapping method increases the contact area between the pipe joint 2 and the outer bladder body 1, and improves the reliability of the connection between the pipe joint 2 and the outer bladder body 1. According to the different materials of the outer bladder body 1, the outer bladder body 1 and the pipe joint 2 can be connected by welding, bonding, etc., and its specific processing technology can be set with reference to the existing technology.

[0062] In one embodiment, when preparing the outer bladder body 1, the through opening includes a drain port and a sewage port, and the drain port and the sewage port are spaced apart along the axial direction of the outer bladder body 1. The pipe joint 2 includes a sewage pipe joint 25 and a drain pipe joint 24, wherein the sewage pipe joint 24 also includes an inlet pipe joint and an outlet pipe joint, the sewage pipe joint 25 adopts an external thread, and the inlet pipe joint and the outlet pipe joint adopt an internal thread; the structure of the inlet pipe joint and the outlet pipe joint is the same, except that the internal water flow direction is opposite. The sewage pipe joint 25, the inlet pipe joint and the outlet pipe joint are spaced apart along the axial direction of the outer bladder body 1 on the side wall of the outer bladder body 1. It can be understood that the sewage pipe joint 25 is used to install a sewage valve or a safety valve, the inlet pipe joint is used to install an inlet pipe, and the outlet pipe joint is used to install an outlet pipe.

[0063] It can be understood that in other embodiments, the through opening may only include a drain opening, that is, the pipe connector 2 only includes a drain pipe connector 24 .

[0064] Correspondingly, the exhaust fixture 3 includes a first exhaust fixture 34 for connecting the sewage pipe joint 25 and a second exhaust fixture 35 for connecting the drain pipe joint 24, wherein the extension length of the second exhaust fixture 35 in the outer liner body 1 is greater than the extension length of the first exhaust fixture 34 in the outer liner body 1. Exemplarily, in one embodiment, the exhaust fixture 3 includes a first exhaust fixture 34 for connecting the sewage pipe joint 25, and two second exhaust fixtures 35 for connecting two drain pipe joints 24. Along the axial direction of the outer liner body 1, the drain pipe joint 24 is closer to the end opening 11 of the outer liner body 1, and therefore, the extension length of the second exhaust fixture 35 in the outer liner body 1 is greater than the extension length of the first exhaust fixture 34 in the outer liner body 1. Figure 4As shown in , H1 is the extension length of the second exhaust tooling 35 in the outer bladder body 1, and H2 is the extension length of the first exhaust tooling 34 in the outer bladder body 1, and H1>H2. For the plastic bladder blank during the blow molding process, the blow molding gas is injected from the end opening 11, and the air pressure at the end opening 11 is higher. When the plastic bladder blank is about to contact the inner wall of the outer bladder body 1 during the blow molding process, the second exhaust tooling 35 with a longer extension length contacts and penetrates the plastic bladder blank earlier to form a connecting port. At this time, the first exhaust tooling 34 can discharge the gas between the outer bladder body 1 and the plastic bladder blank, and the gas in the plastic bladder blank can be discharged through the second exhaust tooling 35, which can effectively avoid the situation where the first exhaust tooling 34 and the second exhaust tooling 35 are covered at the same time, resulting in an instantaneous excessive pressure, so that the blow molding air pressure in the entire plastic bladder blank is more uniform, which is conducive to forming a plastic bladder body 4 with uniform wall thickness.

[0065] In one embodiment, the outer bladder body 1 is made of metal. After the outer bladder body 1 is prepared, the method further includes:

[0066] Step S101, placing the outer bladder body 1 into a high temperature furnace for sintering;

[0067] Step S102: performing sandblasting on the inner wall surface of the sintered outer liner body 1.

[0068] By sintering at a high temperature of 850°C to 890°C in a furnace, the tensile strength of the steel plate is improved, and the risk of rusting of the outer bladder body 1 is reduced. In addition, by sandblasting the inner wall surface, the roughness of the inner wall surface is controlled, the fit between the inner wall surface and the outer wall surface of the plastic bladder body 4 is improved, and bulging due to separation between the outer bladder body 1 and the plastic bladder body 4 is avoided, thereby improving the structural strength of the inner bladder.

[0069] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The specific contents of the above specific embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent 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 concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A liner processing method, characterized in that: The following steps are involved: An outer bladder body (1) is made of a rigid material, one end of the outer bladder body (1) is closed and the other end has an end opening (11), and a side wall of the outer bladder body (1) is provided with a pipe joint (2) connected to the interior of the outer bladder body (1); An exhaust tool (3) is installed in a sealing manner at the pipe joint (2), wherein a portion of the exhaust tool (3) extends into the outer bladder body (1), and an exhaust channel (31) is provided through the exhaust tool (3), wherein the inner diameter of the exhaust channel (31) is smaller than the inner diameter of the pipe joint (2); A plastic bladder body (4) is blow-molded inside the outer bladder body (1), and the outer wall surface of the plastic bladder body (4) is in contact with the inner wall surface of the outer bladder body (1).

2. The inner tank processing method according to claim 1, characterized in that: Blow molding a plastic bladder body (4) in the outer bladder body (1) comprises: Melting the raw materials to obtain a molten material, and making the molten material into a plastic gallbladder blank; The plastic gallbladder blank is placed in the outer gallbladder body (1), and blow-molded to form the plastic gallbladder body (4).

3. The inner tank processing method according to claim 2, characterized in that: When the plastic bladder body (4) is formed by blow molding, gas with a preset blow molding pressure is introduced into the interior of the plastic bladder blank, and the preset blow molding pressure is 0.5MPa-0.9MPa.

4. The inner tank processing method according to claim 2, characterized in that: When the plastic bladder body (4) is formed by blow molding, gas with a preset blow molding temperature is introduced into the interior of the plastic bladder blank, and the preset blow molding temperature is 150° C. to 190° C.

5. The inner tank processing method according to claim 2, characterized in that: When the plastic bladder body (4) is formed by blow molding, the blow molding time is 540S to 660S.

6. The inner tank processing method according to claim 1, characterized in that: The exhaust tooling (3) comprises a mounting portion (32) and an extension portion (33) which are arranged in sequence along the axial direction and connected to each other, the exhaust passage (31) passes through the mounting portion (32) and the extension portion (33), the mounting portion (32) is detachably connected to the pipe joint (2), and when the exhaust tooling (3) is mounted on the pipe joint (2), the extension portion (33) extends into the outer liner body (1), the extension portion (33) protrudes from the inner wall of the inner liner, and there is a gap between the outer wall of the extension portion (33) and the inner wall of the pipe joint (2).

7. The inner tank processing method according to claim 6, characterized in that: After the plastic bladder body (4) is formed by blow molding, the method further comprises: After the plastic bladder body (4) is cooled and shaped, the exhaust tooling (3) is disassembled; The coating layer (41) formed on the plastic bladder body (4) at the inner wall of the pipe joint (2) is smoothed.

8. The inner tank processing method according to claim 7, characterized in that: While waiting for the plastic bladder body (4) to cool and set, the cooling time is 450S to 550S.

9. The inner tank processing method according to claim 7, characterized in that: The lower end surface of the pipe joint (2) has a first step portion (22), and the coating layer (41) fills the first step portion (22).

10. The inner tank processing method according to any one of claims 1 to 9, characterized in that: The pipe joint (2) comprises a sewage pipe joint (25) and a drainage pipe joint (24); the exhaust fixture (3) comprises a first exhaust fixture (34) for connecting the sewage pipe joint (25) and a second exhaust fixture (35) for connecting the drainage pipe joint (24); wherein the extension length of the second exhaust fixture (35) in the outer liner body (1) is greater than the extension length of the first exhaust fixture (34) in the outer liner body (1).

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