A new type of stainless steel carbon steel composite pipe

Abstract

This utility model relates to the technical field of stainless steel-carbon steel composite pipes, specifically to a novel stainless steel-carbon steel composite pipe, comprising: a pipe body; an adhesive injection assembly, the adhesive injection assembly including multiple strips arranged in a circumferential array on the outer wall of the pipe body, with sealing airbags symmetrically installed on the inner walls of the multiple strips, an outer ring provided on the outer wall of each strip, a storage tube fixedly installed on the outer wall of the outer ring, and a squeezing tube slidably installed on the outer wall of the storage tube; and an air injection assembly for injecting air into the sealing airbags. This utility model, by pressing the squeezing tube, pushes the adhesive in the storage tube through the connecting tube and the communicating tube to spray it onto the weld area. Guided by the rubber connecting ring, the adhesive evenly fills the interface gap, bonding the separated area between the stainless steel layer and the carbon steel layer. This not only eliminates bubbles and cracks but also strengthens the interlayer bonding force, prevents delamination, and ensures the mechanical strength and sealing performance of the weld.

Description

Technical Field

[0001] This utility model relates to the technical field of stainless steel-carbon steel composite pipes, and specifically to a novel stainless steel-carbon steel composite pipe. Background Technology

[0002] Stainless steel and carbon steel composite pipes are pipes made of two different materials, stainless steel and carbon steel, through a composite process. Currently, stainless steel composite pipes are widely used in water transportation, gas transportation, and oil transportation. Their advantages lie in combining the corrosion resistance of stainless steel with the high mechanical strength of carbon steel. They also support welding and threaded connections. Taking the stainless steel composite spiral welded pipe disclosed in patent CN215293922U as an example, this utility model increases the oxidation resistance between the pipe materials by combining the stainless steel layer and the carbon steel layer. An anti-oxidation layer is set to prevent external corrosive substances from oxidizing the carbon steel layer. At the same time, it solves the problems of stainless steel composite pipes, where there is a gap between the two pipes, which easily leads to potential corrosion, and the defects such as bubbles, cracks, and delamination at the joint when connecting the pipes.

[0003] However, gaps are formed between the stainless steel and carbon steel layers due to physical bonding (welding). During long-term use, the penetration of the medium can easily induce electrochemical corrosion, significantly reducing the life of the pipe. When the pipe is welded, the joint is prone to structural defects such as bubbles, cracks and delamination due to the loose interlayer bonding, leading to sealing failure and leakage risk. This is especially true for spiral welding processes, where the interlayer separation problem in the weld area is more prominent. Although conventional composite coils improve the interlayer adhesion of the pipe through metallurgical bonding, the weld joint still lacks an effective sealing and corrosion resistance mechanism. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, this utility model provides a novel stainless steel-carbon steel composite pipe, which can effectively solve the problem of electrochemical corrosion induced by medium penetration in the weld seams of the existing pipe.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a novel stainless steel-carbon steel composite pipe, comprising:

[0007] tube body;

[0008] The glue injection assembly includes multiple strips arranged in a circumferential array on the outer wall of the tube. The inner walls of the multiple strips are symmetrically equipped with sealing airbags. The outer wall of the strips is provided with an outer ring. A storage tube is fixedly installed on the outer wall of the outer ring. An extrusion tube is airtightly slidably installed on the outer wall of the storage tube.

[0009] The air injection assembly is used to inject air into the sealed airbag.

[0010] Preferably, a plurality of connecting pipes are fixedly installed in a circumferential array on the inner wall of the outer ring, and each of the connecting pipes is connected in series through a connecting pipe, and a limit ring is fixedly installed on the outer wall of the connecting pipe.

[0011] Preferably, the outer wall of the connecting tube passes through the rubber connecting ring and the strip and is airtightly slidably connected thereto, and one end of one of the connecting tubes passes through the outer ring and communicates with the storage tube, the storage tube being filled with adhesive.

[0012] Preferably, a bracket is fixedly installed on the outer wall of the outer ring, a lifting frame is slidably installed on the upper end of the bracket, and a sliding sleeve is fixedly installed on the lower end of the lifting frame.

[0013] Preferably, an air intake pipe is fixedly installed inside the bracket, the upper end of the air intake pipe passes through the bracket and is airtightly slidably connected to the inner wall of the sliding sleeve, and a spring is fixedly installed between the sliding sleeve and the bracket and on the outer wall of the air intake pipe.

[0014] Preferably, a flow pipe is connected to the outer wall of the air intake pipe and below the bracket, a first one-way valve is fixedly installed on the inner wall of the flow pipe, a second one-way valve is fixedly installed inside the air intake pipe and below the flow pipe, and a delivery pipe is connected to the lower end of the air intake pipe, the lower end of the delivery pipe being connected to the sealing airbag.

[0015] The technical solution provided by this utility model has the following advantages compared with the known prior art:

[0016] 1. Pressing the extrusion tube pushes the adhesive in the storage tube through the connecting tube and the connecting tube to spray it into the weld area. Under the guidance of the rubber connecting ring, the adhesive evenly fills the interface gap and bonds the separation area between the stainless steel layer and the carbon steel layer. This not only eliminates bubbles and cracks, but also strengthens the interlayer bonding force, prevents delamination, and ensures the mechanical strength and sealing performance of the weld.

[0017] 2. Press the lifting frame to drive the sliding sleeve to slide on the air inlet pipe, compress the spring, and allow air to be injected into the sealing airbag through the flow pipe and delivery pipe. After the sealing airbag expands, it forms an airtight contact with the outer wall of the pipe. Its pressure is evenly transmitted through the strip plate, effectively sealing the interlayer gap and blocking the medium penetration path. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the adhesive injection assembly of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the gas injection component of this utility model.

[0022] Reference numerals: 1. Pipe body; 2. Injection assembly; 201. Outer ring; 202. Connecting pipe; 203. Connecting pipe; 204. Limiting ring; 205. Strip plate; 206. Rubber connecting ring; 207. Sealing airbag; 208. Storage pipe; 209. Extrusion pipe; 3. Injection assembly; 301. Support; 302. Lifting frame; 303. Inlet pipe; 304. Sliding sleeve; 305. Spring; 306. Flow pipe; 307. First one-way valve; 308. Delivery pipe. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] The present invention will be further described below with reference to the embodiments.

[0025] Example: Refer to Figures 1 to 3 A novel stainless steel-carbon steel composite pipe, comprising:

[0026] tube body 1;

[0027] The glue injection assembly 2 includes multiple strips 205 arranged in a circumferential array on the outer wall of the pipe body 1. The inner walls of the multiple strips 205 are symmetrically equipped with sealing airbags 207. The floating design of the sealing airbags 207 and the strips 205 can compensate for slight ellipticity errors or surface unevenness after pipe welding, ensuring uniform distribution of sealing pressure. It is especially suitable for on-site construction of large-diameter pipes. The outer wall of the strips 205 is provided with an outer ring 201. The outer wall of the outer ring 201 is fixedly installed with a storage tube 208. The outer wall of the storage tube 208 is airtightly slidably equipped with a compression tube 209.

[0028] Inflation assembly 3 is used to inject air into the sealing airbag 207.

[0029] Reference Figure 2Multiple connecting pipes 202 are fixedly installed in a circumferential array on the inner wall of the outer ring 201. Each connecting pipe 202 is connected in series through a connecting pipe 203. A limit ring 204 is fixedly installed on the outer wall of the connecting pipe 202.

[0030] Reference Figure 2 The outer wall of the connecting pipe 202 passes through the rubber connecting ring 206 and the strip 205 and is airtightly slidably connected to them. One end of one of the connecting pipes 202 passes through the outer ring 201 and is connected to the storage pipe 208. The storage pipe 208 is filled with adhesive. At room temperature, the adhesive is made of epoxy modified polysulfide rubber.

[0031] Reference Figure 3 A bracket 301 is fixedly installed on the outer wall of the outer ring 201. A lifting frame 302 is slidably installed on the upper end of the bracket 301, and a sliding sleeve 304 is fixedly installed on the lower end of the lifting frame 302.

[0032] Reference Figure 3 An air intake pipe 303 is fixedly installed inside the bracket 301. The upper end of the air intake pipe 303 passes through the bracket 301 and is airtightly slidably connected to the inner wall of the sliding sleeve 304. A spring 305 is fixedly installed between the sliding sleeve 304 and the bracket 301 and on the outer wall of the air intake pipe 303.

[0033] Reference Figure 3 The outer wall of the intake pipe 303 and below the bracket 301 is connected to a flow pipe 306. A first one-way valve 307 is fixedly installed on the inner wall of the flow pipe 306. A second one-way valve is fixedly installed inside the intake pipe 303 and below the flow pipe 306. The lower end of the intake pipe 303 is connected to a delivery pipe 308. The lower end of the delivery pipe 308 is connected to the sealing airbag 207.

[0034] The device is fitted onto the outer wall of pipe body 1, so that the sealing airbag 207 symmetrically covers both sides of the weld seam. The position of the outer ring 201 is adjusted to ensure that the adhesive spray nozzle of the connecting pipe 202 is directly opposite the weld seam gap (see attached). Figure 2 As shown), press the lifting frame 302 → drive the sliding sleeve 304 to move down along the air inlet pipe 303 → compress the spring 305. When the sliding sleeve 304 moves down, the second one-way valve opens and the first one-way valve 307 closes → air in the sliding sleeve 304 is forced into the air inlet pipe 303 → injected into the sealing airbag 207 through the delivery pipe 308. Release the lifting frame 302 → the spring 305 returns to its original position and pushes the sliding sleeve 304 up. The first one-way valve 307 opens and the second one-way valve closes → outside air is drawn into the inner cavity of the sliding sleeve 304 through the flow pipe 306. Press repeatedly → the sealing airbag 207 continues to expand → pushes the strip 205 to press tightly against the pipe wall and squeezes the rubber connecting ring 206 to form an initial seal → until the strip 205 contacts the limiting ring 204 and the air supply stops.

[0035] Press the extrusion tube 209 → push the adhesive in the storage tube 208 → input it into the connecting tube 203 through the connecting tube 202 → spray it evenly into the weld area from multiple nozzles in the circumferential array. The adhesive penetrates into the gap between the stainless steel and carbon steel layers under air pressure → fills air bubbles and cracks, and covers the periphery of the weld under the guidance of the rubber connecting ring 206 (to prevent the adhesive from overflowing).

[0036] After the adhesive cures, a permanent sealing layer is formed, which also enhances the mechanical bonding force between the layers. The gas inside the sealing airbag 207 is released, the airbag is released from the tube wall, and the outer ring 201 of the entire module is removed.

[0037] The working principle of this utility model is as follows:

[0038] By fitting this device onto the outer wall of the pipe body 1 and placing the sealing airbag 207 on both sides of the weld seam of the pipe body 1, pressing the lifting frame 302 drives the sliding sleeve 304 to slide down on the outer wall of the air inlet pipe 303, compressing the spring 305. During the sliding descent of the sliding sleeve 304, the first one-way valve 307 closes and the second one-way valve opens, increasing the air pressure inside the sliding sleeve 304 and allowing it to flow into the air inlet pipe 303. Subsequently, releasing the lifting frame 302 reduces the internal pressure, and the compressed spring 305 causes the sliding sleeve 304 and the lifting frame 302 to rise. At this time, the second one-way valve closes and the first one-way valve 307 opens, allowing outside air to flow into the sliding sleeve 304 through the flow pipe 306 and the air inlet pipe 303. By repeatedly pressing, air continuously flows into the sealing airbag 207, causing it to expand and come into close contact with the outer wall of the tube 1. The expanding sealing airbag 207 pushes the strip 205 toward the inner wall of the outer ring 201 and opens the rubber connecting ring 206 until it contacts the limiting ring 204. At this point, the strip 205 and the rubber connecting ring 206 are obstructed, and the air supply stops. By pressing the squeezing tube 209, the adhesive in the storage tube 208 is squeezed, causing the adhesive to flow through one of the connecting tubes 202. Subsequently, it is transported through the connecting tube 203 to each connecting tube 202 and sprayed between the sealing airbags 207. The sprayed adhesive adheres to the weld seam, thus bonding the weld seam.

[0039] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A new type of stainless steel carbon steel composite pipe characterized in that, include: tube body(1); The glue injection assembly (2) includes multiple strips (205) arranged in a circumferential array on the outer wall of the tube body (1). The inner walls of the multiple strips (205) are symmetrically equipped with sealing airbags (207). The outer wall of the strips (205) is provided with an outer ring (201). The outer wall of the outer ring (201) is fixedly installed with a storage tube (208). The outer wall of the storage tube (208) is airtightly slidably equipped with a squeezing tube (209). Inflation assembly (3) is used to inject air into the sealing airbag (207).

2. A novel stainless steel carbon steel composite pipe as claimed in claim 1, wherein, The inner wall of the outer ring (201) is fixedly equipped with a plurality of connecting pipes (202) in a circumferential array. Each of the connecting pipes (202) is connected in series through a connecting pipe (203). The outer wall of the connecting pipe (202) is fixedly equipped with a limit ring (204).

3. A novel stainless steel-carbon steel composite pipe according to claim 2, characterized in that, The outer wall of the connecting tube (202) passes through the rubber connecting ring (206) and the strip (205) and is airtightly slidably connected to them. One end of one of the connecting tubes (202) passes through the outer ring (201) and communicates with the storage tube (208), which is filled with adhesive.

4. A novel stainless steel-carbon steel composite pipe according to claim 3, characterized in that, A bracket (301) is fixedly installed on the outer wall of the outer ring (201), a lifting frame (302) is slidably installed on the upper end of the bracket (301), and a sliding sleeve (304) is fixedly installed on the lower end of the lifting frame (302).

5. A novel stainless steel-carbon steel composite pipe according to claim 4, characterized in that, An air inlet pipe (303) is fixedly installed inside the bracket (301). The upper end of the air inlet pipe (303) passes through the bracket (301) and is airtightly slidably connected to the inner wall of the sliding sleeve (304). A spring (305) is fixedly installed between the sliding sleeve (304) and the bracket (301) and on the outer wall of the air inlet pipe (303).

6. A novel stainless steel-carbon steel composite pipe according to claim 5, characterized in that, The outer wall of the air intake pipe (303) and below the bracket (301) is connected to a flow pipe (306). A first one-way valve (307) is fixedly installed on the inner wall of the flow pipe (306). A second one-way valve is fixedly installed inside the air intake pipe (303) and below the flow pipe (306). The lower end of the air intake pipe (303) is connected to a delivery pipe (308). The lower end of the delivery pipe (308) is connected to a sealing airbag (207).

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