CN110043754A - Anti-corrosion heat distribution pipeline in stainless steel - Google Patents

Abstract

The invention belongs to corrosion-proof technology for pipeline fields, more particularly to a kind of anti-corrosion heat distribution pipeline in stainless steel, including the pipeline matrix made of carbon steel and the stainless steel inner lining being attached on the inside of pipeline matrix, it is characterized by also including connectors, connector is made of stainless steel, its structure includes nail rod and the head of a nail, nail hole is correspondingly arranged on nail rod on the pipeline matrix, the end of nail rod is welded on pipeline matrix, the head of a nail is clipped between pipeline matrix and stainless steel inner lining, and head of a nail spot-welded is on stainless steel inner lining.The connector is parallel arranged in a straight line along one group on tube wall, and each connector equidistantly arranges on straight line, the connector Heterogeneous Permutation on two adjacent parallel lines.The present invention is securely attached to stainless steel inner lining on pipeline matrix, to resist the negative pressure in pipeline, prevents the generation of anti-corrosion Problem of Failure caused by due to stainless steel inner lining delamination by designing unique stainless steel inner lining connection structure.

Description

Stainless steel internal anti-corrosion thermal pipeline

technical field

The invention belongs to the technical field of pipeline anti-corrosion, and particularly relates to a stainless steel internal anti-corrosion thermal pipeline.

Background technique

Thermal pipeline is a kind of infrastructure in heating and heating engineering. At present, most of the thermal pipelines are made of carbon steel. Due to the particularity of the operating environment, it is difficult to process an effective anti-corrosion layer on the inner wall of the pipeline, resulting in a rapid corrosion rate of the pipeline. In order to ensure the service life of the pipeline, the wall thickness of the pipeline can only be increased. , and increasing the wall thickness will not only consume a lot of steel, but also increase a lot of pipeline transportation and installation costs. In order to solve the above problems, the technicians proposed an anti-corrosion scheme of lining stainless steel in carbon steel pipes. In fact, this scheme has been applied in actual construction, but it is found that this scheme has serious defects in actual use: at present, stainless steel The lining is attached to the inner wall of the carbon steel by hydraulic expansion, and the adhesion strength is relatively small. When the pipeline is drained, the negative pressure generated in the pipeline will delaminate the stainless steel lining and the carbon steel, causing the stainless steel lining to fall off. , especially when the diameter of the pipe is large and the wall thickness of the stainless steel lining is thin, the stainless steel lining is more likely to fall off.

SUMMARY OF THE INVENTION

The present invention provides a stainless steel inner anti-corrosion thermal pipeline to solve the above-mentioned problems in the background art.

The technical problem solved by the present invention adopts the following technical solutions to realize:

The invention includes a pipe base made of carbon steel and a stainless steel lining attached to the inner side of the pipe base, and is characterized in that it also includes a connecting piece, the connecting piece is made of stainless steel, and its structure includes a nail rod and a nail cap. The pipe base is provided with a nail hole corresponding to the nail rod. After the connector is inserted into the nail hole from the inside of the pipe base, the end of the nail rod is welded on the pipe base. The nail cap is sandwiched between the pipe base and the stainless steel lining. Spot welded to stainless steel lining.

The material of the connecting piece is the same as that of the stainless steel lining. The connecting pieces are arranged along a group of parallel straight lines on the pipe wall, the connecting pieces are arranged at equal intervals on the straight line, and the connecting pieces on two adjacent parallel lines are arranged in dislocation. There are three welding spots between each nail cap and the stainless steel lining, and the three welding spots are evenly arranged along the edge of the nail cap.

The present invention also provides a process method for manufacturing the above-mentioned stainless steel inner anti-corrosion thermal pipeline, comprising the following steps:

Step 1, take the pipe base 1, and process the nail holes on the pipe wall;

Step 2, insert the nail rod 4 on the connector 3 into the nail hole from the inner side of the pipeline base 1, and use a tight fit between the nail rod 4 and the nail hole;

Step 3, inserting the stainless steel lining 2 into the pipeline base 1, and attaching the stainless steel lining 2 to the inner wall of the pipeline base 1 by means of hydraulic expansion;

Step 4, welding the stainless steel lining 2 and the nail cap 5 through a spot welding process.

The beneficial effects of the present invention are as follows: the present invention designs a unique stainless steel lining connection structure, so that the stainless steel lining is firmly attached to the pipeline base, so as to resist the negative pressure in the pipeline and prevent the corrosion caused by the delamination of the stainless steel lining. failure problem occurs.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of the structure of the connector.

In the picture: 1-pipe base, 2-stainless steel lining, 3-connector, 4-pin rod, 5-pin cap.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings:

The present invention includes a pipe base 1 made of carbon steel and a stainless steel lining 2 attached to the inside of the pipe base 1 . The above is the existing structure in the prior art, which is not repeated here.

The innovation of the present invention is that the present invention further includes a connecting piece 3, which is made of stainless steel, and its structure includes a nail rod 4 and a nail cap 5, and the pipe base 1 is provided with nail holes corresponding to the nail rod 4. , after the connector 3 is inserted into the nail hole from the inside of the pipe base, the end of the nail rod 4 is welded to the pipe base 1, and the nail cap 5 is welded to the stainless steel lining 2 by spot welding.

To implement, follow these steps:

Step 1, take the pipe base 1, and process the nail holes on the pipe wall;

Step 2: Insert the nail rod 4 on the connecting piece 3 into the nail hole from the inner side of the pipe base 1. In order to facilitate the installation of the connecting piece 3, it is better to use a tight fitting between the nail rod 4 and the nail hole. Matching to ensure that after the connector 3 is installed, it will not fall off from the nail hole under the action of its own gravity;

Step 3, inserting the stainless steel lining 2 into the pipeline base 1, and attaching the stainless steel lining 2 to the inner wall of the pipeline base 1 by means of hydraulic expansion;

Step 4, welding the stainless steel lining 2 and the nail cap 5 through a spot welding process. Spot welding refers to a welding method in which a cylindrical electrode is used to form a welding spot between the contact surfaces of two overlapping workpieces during welding. During spot welding, pressure is applied to make the workpiece in close contact, and then the current is turned on. Under the action of resistance heat, the contact of the workpiece is melted, and a solder joint is formed after cooling. There are two advantages of adopting this process in the present invention: 1. After welding, the integrity of the stainless steel lining 2 will not be damaged, so that the integrity of the stainless steel inner anti-corrosion layer; 2. This process can be used in the stainless steel lining 2. The inner side of the welding machine is welded, the process is less difficult and the construction is convenient.

In order to solve the problem of delamination of the stainless steel lining 2 affected by negative pressure, technicians have made many assumptions and attempts. Among them, a theoretically feasible solution is to weld the stainless steel lining 2 on the pipeline base 1. However, due to the stainless steel lining 2 After welding with carbon steel, the corrosion resistance of the stainless steel in the welding pool will be greatly reduced, thus forming an anticorrosion failure point at the weld and destroying the overall anticorrosion performance of the inner wall of the pipeline. Therefore, the welding method was rejected by the technicians from the beginning. In the present invention, by designing a unique stainless steel lining 2 connection structure, the stainless steel lining 2 is indirectly connected to the pipeline base 1. Due to the existence of the nail rod 4, the influence of welding will not be transmitted to the nail cap 5. Therefore, The anti-corrosion properties of the nail head 5 are not affected by welding.

The material of the connecting piece 3 is the same as that of the stainless steel lining 2 , so that the nail cap 5 and the stainless steel lining 2 have the same anti-corrosion performance.

The connecting pieces 3 are arranged along a set of parallel lines on the pipe wall, the connecting pieces 3 are arranged at equal intervals on the straight line, and the connecting pieces 3 on two adjacent parallel lines are arranged in a dislocation, and this arrangement makes the inner wall of the pipe. Forming a plurality of triangular areas as shown by the dotted line in FIG. 1 is beneficial to further ensure the adhesion strength of the stainless steel lining 2 on the pipeline base 1 .

In the specific implementation process, in order to further ensure the connection strength between the nail cap 5 and the stainless steel lining 2, the nail cap 5 can be welded on the stainless steel lining 2 by spot welding. There are three welding points in total, and the three welding points are along the The edges of the nail caps 5 are evenly arranged, that is, the two adjacent welding points are separated by an arc of 120°.

In the specific implementation process, the inner diameter of the pipeline can reach one meter to two meters, and the thickness of the stainless steel lining 2 can be as low as 2 mm or less.

Claims (5)

1. a stainless steel inner anti-corrosion thermal pipeline, comprising a pipeline matrix made of carbon steel and a stainless steel lining attached to the inner side of the pipeline matrix, it is characterized in that: also comprise a connecting piece, the connecting piece is made of stainless steel, and its structure comprises a nail A rod and a nail cap, the pipe base is provided with a nail hole corresponding to the nail rod. After the connector is inserted into the nail hole from the inside of the pipe base, the end of the nail rod is welded on the pipe base, and the nail cap is clamped between the pipe base and the pipe base. Between the stainless steel linings, the nail caps are spot welded on the stainless steel lining. 2 . The stainless steel inner anti-corrosion thermal pipeline according to claim 1 , wherein the material of the connecting piece is the same as that of the stainless steel lining. 3 . 3. The stainless steel internal anti-corrosion thermal pipeline according to claim 1, characterized in that: the connecting pieces are arranged along a set of parallel lines on the pipe wall, and the connecting pieces are arranged at equal intervals on the line, and the adjacent connecting pieces are arranged at equal intervals. The connectors on the two parallel lines are arranged in dislocation. 4 . The stainless steel inner anticorrosion thermal pipeline according to claim 1 , wherein there are three welding spots between each nail cap and the stainless steel lining, and the three welding spots are evenly arranged along the edge of the nail cap. 5 . 5. a process method for manufacturing the stainless steel inner anti-corrosion thermal pipeline as claimed in any one of claims 1-4, comprising the steps: Step 1, take the pipe base 1, and process the nail holes on the pipe wall; Step 2, insert the nail rod 4 on the connector 3 into the nail hole from the inner side of the pipeline base 1, and use a tight fit between the nail rod 4 and the nail hole; Step 3, inserting the stainless steel lining 2 into the pipeline base 1, and attaching the stainless steel lining 2 to the inner wall of the pipeline base 1 by means of hydraulic expansion; Step 4, welding the stainless steel lining 2 and the nail cap 5 through a spot welding process.