A hollow pipe body for assisting in film suction and film pasting and a tool for assisting in film suction and film pasting

Abstract

The application discloses a hollow pipe body for assisting film suction and film pasting and a tool for assisting film suction and film pasting. The cross section of the hollow pipe body is a concave-convex structure arranged regularly, and a plurality of air holes are arranged on the wall surface of the hollow pipe body. The tool for assisting film suction and film pasting comprises the hollow pipe body and two end head sealing joints fixed at the two ends of the hollow pipe body and used for sealingly connecting the two ends of the pipe to be pasted with or the peripheral end faces of the two end faces of the pipe to be pasted. The outer ends of the two end head sealing joints are respectively fixed with an air pipe used for blowing air into or sucking air out of the hollow pipe body and a suction pipe used for sucking air out of the space between the protective film and the inner wall of the pipe to be pasted. The hollow pipe body can suck the protective film to its surface under negative pressure. When the tool is used in cooperation with the tool for assisting film suction and film pasting, the tool is inserted into the pipe to be pasted, the protective film is transferred to the inner wall of the pipe to be pasted by using the principle of air blowing and inflation, and then the film pasting process and other means are used to realize firm pasting, so that the protective film can be firmly pasted to the inner wall of the long pipe under the constraint of the length and size of the pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe inner wall film pasting, in particular to a hollow pipe body for assisting film pasting and a film pasting tool. BACKGROUND

[0002] When the fluid flowing in the pipe is corrosive, the pipe itself or the pipe inner wall surface needs to be protected by a layer of material with corrosion resistance. The pipe inner wall can be protected by forming a paint film protective layer through multiple coating, lining, enamel, or composite pipe formed from strip material. When the pipe is small and long, it is difficult to form a paint film or lining or enamel due to the size and length limitations. It is also difficult to form a pipe from a composite material with a polymer surface layer and a metal base material, and it is difficult to make the metal surface layer of the composite pipe thinner, such as less than 0.3 mm. When the product has been used by the customer for a short time, the protective layer of the pipe inner wall is found to be partially damaged, and it is difficult to repair or impossible to repair, especially for small and long pipes. The entire device, such as a heat exchanger, may be scrapped. It is a good technical development direction to firmly paste a thick film or a film or a membrane on the inner wall of the pipe to be protected. However, it is difficult to firmly paste the thick film or the film or the membrane on the surface of the pipe to be protected. Therefore, a film pasting tool for the pipe inner wall is needed. SUMMARY

[0003] In view of the technical problems in the background, one of the purposes of the present application is to provide a hollow pipe body for assisting film pasting, which can adsorb a protective film on the surface thereof under negative pressure. Another purpose of the present application is to provide a film pasting tool for assisting film pasting, which can firmly paste a protective film on the inner wall of a pipe to be pasted.

[0004] To achieve the above purposes, the technical solutions adopted by the present application are as follows.

[0005] A hollow pipe body for assisting film pasting, wherein the cross-sectional outer contour of the hollow pipe body is a regularly arranged concave-convex structure, and a plurality of air holes are formed on the wall surface of the hollow pipe body.

[0006] Further, the concave-convex structure of the outer contour of the hollow pipe body is inwardly offset by 0.1-3 mm to form an inner contour with the same shape as the outer contour, and the air holes are formed at the concave valleys and / or convex peaks of the hollow pipe body.

[0007] The application further discloses an auxiliary film suction and sticking tool, which comprises the hollow pipe body and two end head sealing joints fixed at two ends of the hollow pipe body and used for sealing connection with two ends of a film to be stuck or with surrounding end faces of the two ends of the film to be stuck.

[0008] Further, the end head sealing joint comprises an inner sealing member, an outer sealing member sleeved on the outer periphery of the inner sealing member, a fixing member detachably mounted at one end of the inner sealing member, and a plurality of sealing rings sleeved on the outer side of the inner sealing member and used for sealing cooperation with the outer sealing member. One end of the outer sealing member is sealingly cooperated with the end of the film to be stuck or with the surrounding end face of the end of the film to be stuck, and the other end is locked and fixed through the fixing member.

[0009] Wherein, the inner part of the inner sealing member is provided with a gas cavity, one end of the gas cavity is communicated with the air pipe through a first hole cavity, and the other end is communicated with the end face of the end of the inner sealing member away from the air pipe through one or more second hole cavities.

[0010] Wherein, the inner sealing member comprises a first cylindrical part, a second cylindrical part and a third cylindrical part which are sequentially connected and gradually decrease in diameter. One or more first annular grooves are formed on the outer wall surface of the first cylindrical part, and a first sealing ring is mounted in the first annular groove. One or more second annular grooves are fixed on the outer wall surface of the second cylindrical part, and a second sealing ring is mounted on the second annular groove.

[0011] Preferably, the fixing member is a nut, and an external thread is formed on the outer wall surface of the third cylindrical part for thread connection with the nut.

[0012] Further, the inner part of the outer sealing member is provided with a mounting through hole along the axis, which is matched with the outer shape of the inner sealing member, and a ring-shaped gas cavity is formed in the inner part of the outer sealing member close to the end of the air extraction pipe. One end of the ring-shaped gas cavity is communicated with the air extraction pipe, and the other end is communicated with the end of the outer sealing member away from the air extraction pipe through one or more third hole cavities.

[0013] Further, the mounting through hole comprises a first mounting section matched with the outer shape of the first cylindrical part and a second mounting section matched with the outer shape of the second cylindrical part. The inner wall surface of the first mounting section is provided with a third annular groove for mounting the first sealing ring at a position corresponding to each first annular groove, and the inner wall surface of the second mounting section is provided with a fourth annular groove for mounting the second sealing ring at a position corresponding to each second annular groove.

[0014] Further, the outer seal has a ring-shaped sealing groove on the end face away from the air suction pipe, and a ring-shaped sealing ring is arranged in the ring-shaped sealing groove to seal the outer end face of the tube plate of the heat exchange pipe or the end face of the pipe to be pasted with the film.

[0015] Further, the outer seal has a ring-shaped sealing groove on the end face away from the air suction pipe, and a ring-shaped sealing ring is arranged in the ring-shaped sealing groove to seal the outer end face of the tube plate of the heat exchange pipe or the end face of the pipe to be pasted with the film.

[0016] Further, the hollow pipe body is embedded with a connecting head at each end, and a plurality of fourth cavities are arranged between the outer wall surface of the connecting head and the inner wall surface of the hollow pipe body. The connecting head is fixedly connected with a connecting rod, and the outer wall surface of the connecting rod is provided with external threads. One end of the inner seal is provided with a first internal thread hole for threadedly connecting with the connecting rod, and one end of the hollow pipe body extends into the counterbore.

[0017] In one embodiment, the connecting rod and the connecting head are integrally formed.

[0018] In another embodiment, the connecting rod is a single structure, and the connecting head is provided with a second internal thread hole at the center for threadedly connecting with the connecting rod.

[0019] Preferably, the connecting head is embedded into the end of the hollow pipe body by welding or gluing.

[0020] Preferably, the inner seal and the outer seal are both made of metal.

[0021] The present application has the following advantages:

[0022] 1. The auxiliary film suction and pasting tool can suction the protective film to the surface of the hollow pipe body under negative pressure, then the tool with the suctioned protective film is inserted into the pipe to be pasted with the film, and the protective film is transferred to the inner wall of the pipe under the principle of air inflation, and then the film is firmly pasted to the inner wall of the long pipe under the constraint of the film pasting process and other means.

[0023] 2. The concave-convex structure of the hollow pipe body can suction the soft and thin film in the inflated state to the surface of the pipe with a smaller diameter, so that the film can be pasted to the inner wall of the long pipe.

[0024] 3. The distance of the film friction adhesive layer is reduced during the film inflation and pasting process, the friction distance is greatly reduced, the degree of the uneven thickness of the adhesive layer is greatly reduced, the extreme situation of the partial loss of the adhesive layer is avoided, or the thickness of the adhesive layer is thinner, the adhesive material is saved, the adhesive or heat curing time is shortened, and the thinner adhesive layer of the heat exchange pipe wall means smaller heat transfer resistance and larger heat transfer coefficient.

[0025] 4. This tool can not only be used as a heating element based on Ohm's law thermal effect to heat the film and adhesive layer to promote faster and better adhesion, but it can also heat the film uniformly.

[0026] 5. Alternatively, by utilizing the first cavity, air cavity, second cavity, fourth cavity, hollow tube body cavity, and vent passage of the vent pipe of the inner sealing section of the end sealing section, hot air can be supplied for heating or cold air for cooling, according to the requirements of the film application process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the first type of cross-section of the end of the hollow tube in Embodiment 1.

[0028] Figure 2 This is a schematic diagram of the second type of cross-section of the end of the hollow tube in Example 1.

[0029] Figure 3 for Figure 2 A schematic diagram of the structural formation process of a hollow tube.

[0030] Figure 4 This is a schematic diagram of the third type of cross-section of the end of the hollow tube in Example 1.

[0031] Figure 5 This is a three-dimensional structural diagram of the film-applying tool in Example 2.

[0032] Figure 6 for Figure 5 A schematic diagram of the internal structure.

[0033] Figure 7 This is a schematic diagram of the air extraction state of the suction film application tool in Example 2.

[0034] Figure 8 This is a schematic diagram of the air blowing state of the film suction and film application tool in Example 2.

[0035] Figure 9 This is a three-dimensional structural diagram of the end sealing joint.

[0036] Figure 10 This is a three-dimensional structural diagram of the inner sealing element.

[0037] Figure 11 This is a three-dimensional structural diagram of the outer sealing element.

[0038] Figure 12 This is a schematic diagram of the end cross-section structure of the hollow tube.

[0039] Figure 13 This is a schematic diagram of the connection between the end sealing joint and the hollow tube in Example 3.

[0040] Figure 14 This is a schematic diagram of the film application tool in Example 4.

[0041] Key component symbols: 1. Hollow tube body; 10. Vent hole; 100. Protective membrane; 101. Outer contour; 102. Inner contour; 103. Connector; 104. Fourth cavity; 105. Connecting rod; 106. Second internal threaded hole; 107. Weld or rubber strip; 200. Annular sealing ring; 201. Vent pipe; 202. Extraction pipe; 203. First annular groove; 204. First sealing ring; 205. Second annular groove; 206. Second sealing ring; 207. Third annular groove; 208. Fourth... 209. Annular groove; 21. Annular sealing ring groove; 21. Inner sealing element; 210. Air cavity; 211. First cavity; 212. Second cavity; 213. First columnar part; 214. Second columnar part; 215. Third columnar part; 216. First internal threaded hole; 22. Outer sealing element; 221. Mounting through hole; 222. Countersunk hole; 223. Annular cavity; 224. Third cavity; 225. First mounting section; 226. Second mounting section; 23. Fixing element; 3. Tube to be coated with membrane; 4. Heat exchanger tube sheet. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment discloses a hollow tube body for assisting in film application. The outer contour 101 of the cross-section of the hollow tube body 1 has a regularly arranged concave-convex structure, and a plurality of ventilation holes 10 are formed on the wall surface of the hollow tube body 1. The concave-convex structure of the outer contour 101 of the hollow tube body 1 is offset inward by 0.1-3mm to form an inner contour 102 with the same shape as the outer contour 101. The ventilation holes 10 are formed at the valleys and / or peaks of the hollow tube body 1.

[0045] like Figure 2 The diagram shown is a structural schematic of the second type of end cross-section of the hollow tube in this embodiment. The formation process of the hollow tube in this structure is as follows: Figure 3 As shown, the process includes the following steps: 1. Before creating the undulating folds, drill several vent holes at specified locations and in specified quantities into the thin plate. Figure 3 (This step is omitted); 2. Make concave and convex pleats on the thin plate and cut it; 3. Bend the concave and convex thin plate into a circle; 4. Weld the concave and convex thin plate into place at the end (the convex peak), and pull out the internal reference round tube while welding; 5. Insert, adjust and center the connector and fix it to the end of the hollow tube by welding or gluing.

[0046] As Figure 4 Fig. 3 shows a third type of structure of the end cross section of the hollow tube body of the present embodiment.

[0047] Embodiment Two

[0048] As Figures 5-12 shown, the present embodiment discloses an auxiliary film suction and pasting tool, which comprises a hollow tube body 1 for suction and adhesion of a protective film 100 and two end head sealing joints fixed at both ends of the hollow tube body 1 and used for sealing connection with the surrounding end face of the two end faces of a film to be pasted pipe 3 (also the outer end face of the heat exchange pipe tube plate). The hollow tube body 1 is of the structure in Embodiment One.

[0049] The outer end of the end head sealing joint is respectively provided with an air pipe 201 for blowing or sucking air into the inside of the hollow tube body 1 and an air suction pipe 202 for sucking out air between the protective film 100 and the inner wall of the film to be pasted pipe 3. The end head sealing joint comprises an inner sealing member 21, an outer sealing member 22 sleeved on the outer periphery of the inner sealing member 21, a fixing member 23 detachably mounted at one end of the inner sealing member 21, and a plurality of sealing rings sleeved on the outer side of the inner sealing member 21 and used for sealing cooperation with the outer sealing member 22. Preferably, the inner sealing member 21 and the outer sealing member 22 are both metal members. One end of the outer sealing member 22 is sealingly cooperated with the outer end face of the end tube plate 4 of the film to be pasted pipe 3, and the other end is locked and fixed by the fixing member 23.

[0050] The inner part of the inner sealing member 21 is provided with an air cavity 210, one end of the air cavity 210 is connected with the air pipe 201 through a first hole cavity 211, and the other end is connected with the end face of the end of the inner sealing member 21 away from the air pipe 201 through one or more second hole cavities 212. The inner sealing member 21 comprises a first cylindrical part 213, a second cylindrical part 214 and a third cylindrical part 215 connected in sequence and gradually decreasing in diameter. One or more first annular grooves 203 are formed on the outer wall surface of the first cylindrical part 213, and a first sealing ring 204 is mounted in the first annular groove 203. One or more second annular grooves 205 are fixed on the outer wall surface of the second cylindrical part 214, and a second sealing ring 206 is mounted on the second annular groove 205. Preferably, the fixing member 23 is a nut, and an external thread is formed on the outer wall surface of the third cylindrical part 215 for threaded connection with the nut.

[0051] The outer sealing element 22 has an axially oriented mounting through hole 221 that matches the shape of the inner sealing element 21. An annular air chamber 223 is formed at one end of the outer sealing element 22 near the suction pipe 202. One end of the annular air chamber 223 is connected to the suction pipe 202, and the other end is connected to the end of the outer sealing element 22 away from the suction pipe 202 via several third holes 224. The mounting through hole 221 includes a first mounting section 225 that matches the shape of the first columnar portion 213 and a second mounting section 226 that matches the shape of the second columnar portion 214. The inner wall of the first mounting section 225 has a third annular groove 207 for mounting the first sealing ring 204 at a position corresponding to each first annular groove 203. The inner wall of the second mounting section 226 has a fourth annular groove 208 for mounting the second sealing ring 206 at a position corresponding to each second annular groove 205. Preferably, the outer sealing element 22 has an annular sealing groove 209 on the end face away from the exhaust pipe 202, and an annular sealing ring 200 for sealing and cooperating with the outer end face of the heat exchange tube sheet 4 is installed in the annular sealing groove 209.

[0052] The outer sealing element 22 has a recessed countersunk hole 222 at its end face away from the extraction pipe 202, and one end of the third cavity 224 is connected to the end face of the countersunk hole 222. A connector 103 is embedded at each end of the hollow tube 1, and the connector 103 is embedded into the end of the hollow tube 1 by welding or adhesive bonding. Several fourth cavities 104 are provided between the outer wall surface of the connector 103 and the inner wall surface of the hollow tube 1. A connecting rod 105 is fixedly connected to the connector 103, and the outer wall surface of the connecting rod 105 has an external thread. One end of the inner sealing element 21 has a first internal threaded hole 216 for threaded connection with the connecting rod 105. One end of the hollow tube 1 extends into the countersunk hole 222. The protective membrane 100 is fitted over the outside of the hollow tube 1, and its end is sealed to the end face of the inner sealing element 21. In this embodiment, the connecting rod 105 is a single structure, and the center of the connector 103 is provided with a second internal thread hole 106 for threaded connection with the connecting rod 105.

[0053] Example 3

[0054] like Figure 13 As shown, this embodiment discloses an auxiliary suction film application tool. The only difference between this embodiment and Embodiment 2 is that the connecting rod 105 and the connecting head 103 are integrally formed. The rest of the structure of this embodiment is the same as that of Embodiment 2.

[0055] Example 4

[0056] like Figure 14As shown, the embodiment discloses a kind of auxiliary suction film pasting tool, the difference between the embodiment and embodiment two is only that suction pipe 202 is installed in the side of outer seal and is communicated with annular air cavity 223.The rest of the structure of this embodiment is the same as that of embodiment two.

[0057] Although the present application has been particularly shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application as defined by the appended claims.

Claims

1. An auxiliary film suction and pasting tool, characterized by: The hollow tube body has a regularly arranged concave-convex structure in cross section, and a plurality of air holes are formed in the wall of the hollow tube body. The concave-convex structure of the outer contour of the hollow tube body is inwardly offset by 0.1-3 mm to form an inner contour with the same shape as the outer contour, and the air holes are formed at the concave valleys and / or convex peaks of the hollow tube body. The end sealing joints are fixed at the two ends of the hollow tube body and are used for sealing connection with the two ends of the pipe to be coated or the surrounding end surface of the end surface of the pipe to be coated. The end sealing joint comprises an inner sealing member, an outer sealing member sleeved on the outer periphery of the inner sealing member, a fixing member detachably mounted at one end of the inner sealing member, and a plurality of sealing rings sleeved on the outer side of the inner sealing member and used for sealing cooperation with the outer sealing member. The inner sealing member has a gas cavity formed therein, one end of the gas cavity is connected with the air pipe through a first hole, and the other end is connected with the end surface of the inner sealing member away from the air pipe through one or more second holes. The inner sealing member comprises a first cylindrical part, a second cylindrical part and a third cylindrical part connected in sequence and gradually decreasing in diameter, a plurality of first annular grooves are formed in the outer wall surface of the first cylindrical part, and a first sealing ring is mounted in the first annular groove.

2. The tool according to claim 1, wherein: The fixing member is a nut, and an external thread is formed in the outer wall surface of the third cylindrical part for threaded connection with the nut.

3. The tool according to claim 1, wherein: The inner part of the outer sealing member has an installation through hole matched with the outer shape of the inner sealing member along the axis, and an annular gas cavity is formed in the inner part of the outer sealing member near the air exhaust pipe, one end of the annular gas cavity is connected with the air exhaust pipe, and the other end is communicated with one end of the outer sealing member away from the air exhaust pipe through one or more third holes.

4. The tool according to claim 3, wherein: The installation through hole comprises a first installation section matched with the outer shape of the first cylindrical part and a second installation section matched with the outer shape of the second cylindrical part, and a third annular groove for mounting the first sealing ring is formed in the inner wall surface of the first installation section at a position corresponding to each first annular groove, and a fourth annular groove for mounting the second sealing ring is formed in the inner wall surface of the second installation section at a position corresponding to each second annular groove.

5. The tool according to claim 3, wherein: The outer seal is provided with an annular sealing ring groove on the end face away from the air exhaust pipe, an annular sealing ring for sealing cooperation with the outer end face of the tube plate of the heat exchange pipe or the end face of the pipe to be pasted is arranged in the annular sealing ring groove, the outer seal is recessed inward to form a counterbore on the end face away from the air exhaust pipe, one end of the third cavity is communicated with the end face of the counterbore, the two ends of the hollow pipe body are respectively embeddedly arranged with a connecting head, a plurality of fourth cavities are arranged between the outer wall surface of the connecting head and the inner wall surface of the hollow pipe body, the connecting head is fixedly connected with a connecting rod, the outer wall surface of the connecting rod is provided with external threads, one end of the inner seal is provided with a first internal thread hole for threaded connection with the connecting rod, one end of the hollow pipe body is inserted into the counterbore, the connecting rod and the connecting head are integrally formed, the connecting rod is a single structure, the center of the connecting head is provided with a second internal thread hole for threaded connection with the connecting rod, the connecting head is embedded into the end of the hollow pipe body by welding or gluing, and the materials of the inner seal and the outer seal are metal.

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