CN211649336U - A plastic-coated steel pipe protector - Google Patents

Abstract

The utility model provides a plastic-coated steel pipe protector. A groove for connecting pipes is formed on the outer side wall of the plastic-coated steel pipe, and a bump is formed on the inner side wall of the plastic-coated steel pipe at a position corresponding to the groove; Combined pipe and protective sleeve; one end edge of the embedded pipe is bent to the outside to form a flanging, and the other end is connected with the sheathing pipe; when the protective piece is installed on the plastic-coated steel pipe, the flanging of the embedded pipe It is in contact with the end face of the mouth of the plastic-coated steel pipe, and the outer wall of the fitting pipe and the inner side wall of the plastic-coated steel pipe are fitted together; the outer wall of the protective tube and the inner side wall of the plastic-coated steel pipe form a protective space for accommodating bumps , one end of the protection space close to the mouth of the plastic-coated steel pipe is watertightly sealed. Avoid the water flowing through the plastic-coated steel pipe from top to bottom to impact the bump and the damage of the plastic-coated layer around the bump, prevent the plastic-coated layer from falling off and block the pipeline, and at the same time prevent the pipeline from being oxidized or corroded, and prolong the service life of the plastic-coated steel pipe .

Description

A plastic-coated steel pipe protector

technical field

The utility model belongs to the field of plastic-coated steel pipe connectors, in particular to a plastic-coated steel pipe protector.

Background technique

Plastic-coated steel pipe, also known as plastic-coated pipe, steel-plastic composite pipe, plastic-coated composite steel pipe, is based on steel pipe, and a layer of plastic anti-corrosion layer or a plastic anti-corrosion layer is welded on the inner surface of the steel pipe (bottom pipe) through spraying, rolling, dipping and suction processes. Steel-plastic composite steel pipe with plastic anti-corrosion layer welded on the inner and outer surfaces. Plastic-coated steel pipes have excellent corrosion resistance and relatively small frictional resistance. Epoxy resin plastic-coated steel pipe is suitable for the transportation of water supply and drainage, seawater, warm water, oil, gas and other media, and PVC plastic-coated steel pipe is suitable for the transportation of drainage, seawater, oil, gas and other media.

In the existing plastic-coated steel pipe connection technology, the pressure groove connection is the most widely used. The pressure groove connection is to punch grooves on two plastic-coated steel pipes that need to be connected, and then fix them in the grooves of the two pipes with connectors. This form of pipeline system is widely used in high-rise and super-high-rise rainwater risers.

However, there are hidden dangers in this connection technology. In the project practice, it was found that after the plastic-coated steel pipe was punched in the groove, the sidewall of the plastic-coated steel pipe was dented and deformed from the outside to the inside, resulting in damage to the plastic-coated layer of the inner layer. The conventional construction process is to coat the supporting After the repair fluid is installed, the pipes are installed. Due to long-term water scouring and the different shrinkage ratios of plastic and steel materials, the plastic coating layer is likely to fall off. After de-plasticizing, the exposed metal on the inner wall of the pipeline is prone to oxidation reaction and corrosion, which shortens the service life of the pipe. More seriously, the peeled plastic coating residue will eventually cause the pipeline to block, seepage and even burst.

Utility model content

The purpose of the utility model is to isolate the damage area of the plastic-coated groove by arranging a protective piece for connecting the plastic-coated steel pipe pressure groove, and to prevent the plastic-coated layer from being washed off by the water flow.

The utility model is achieved through the following technical solutions:

A plastic-coated steel pipe protector, the outer side wall of the plastic-coated steel pipe is formed with a groove for connecting pipes, and a bump is formed on the inner side wall of the plastic-coated steel pipe at the position corresponding to the groove; pipe; one end edge of the fitting pipe is bent to the outside to form a flanging, and the other end is connected to the sheath pipe;

When the protector is installed on the plastic-coated steel pipe, the flange of the fitting pipe is in contact with the end face of the mouth of the plastic-coated steel pipe, and the outer wall of the fitting pipe is fitted with the inner side wall of the plastic-coated steel pipe; A protection space for accommodating bumps is formed between the outer side wall and the inner side wall of the plastic-coated steel pipe, and one end of the protection space close to the nozzle of the plastic-coated steel pipe is watertightly closed.

Through the above scheme, the utility model obtains at least the following technical effects: when two plastic-coated steel pipes are connected to each other as a drainage pipe from high to low, the protective member is lined with the plastic-coated steel pipe body below, and the flange of the fitting pipe is It is clamped on the end face of the butt joint of two plastic-coated steel pipes. The fixing of the protector in the plastic-coated steel pipe is completed by the fitting of the fitting pipe and the plastic-coated steel pipe and the abutment of the flange. A protective space for accommodating bumps is formed between the sheath tube and the inner wall of the plastic-coated steel pipe, and the bumps and the damaged parts of the plastic-coated layer generated around the bumps are stored in the protective space. In this way, when the plastic-coated steel pipe is used as a drainage pipe, the water flowing through the plastic-coated steel pipe from top to bottom can impact the bump and the damage of the plastic-coated layer around the bump, so as to prevent the plastic-coated layer from falling off and blocking the pipeline, and to avoid the plastic-coated layer. After falling off, the pipeline undergoes oxidation reaction or is corroded, which prolongs the service life of the plastic-coated steel pipe.

Optionally, the fitting tube is communicated with the sheath tube through a socket tube with a different diameter.

The reducing socket pipe fitting is a common reducing pipe fitting in the prior art. It can connect two pipes of different diameters by means of thread connection, and can be fitted for different diameters of plastic-coated steel pipes and different thicknesses of bumps. The matching of the pipe and the sheath, and when the fitting pipe or sheath is damaged, only the damaged part can be replaced, saving maintenance costs.

Optionally, the fitting tube and the sheath tube are integrally formed.

The fitting tube and the sheathing tube are integrally formed by stamping and forming technology, which has better sealing performance and structural strength, and avoids water seepage at the connection between the fitting tube and the sheathing tube, which may lead to erosion of the damaged plastic layer.

Optionally, a step surface is formed in the transition area between the fitting tube and the sheath tube, and the ridge formed by the intersection of the step surface and the inner side wall of the fitting tube is rounded to form a concave curved surface.

Since the diameters of the fitting tube and the sheathing tube are different, a stepped surface will be formed in the transition area between the integrally formed fitting tube and the sheathing tube. Rounded corner treatment can prevent the concave corrugation between the stepped surface and the inner wall of the fitting tube from becoming a dead corner of accumulated water or debris, so that the debris can be discharged with the flushing of the water flow without accumulating water.

Optionally, the ridge formed by the intersection of the stepped surface and the inner side wall of the sheath tube is rounded to form a convex curved surface.

The convex corrugation formed between the stepped surface and the sheath is the part that bears the greatest impact force of the water flow. After rounding treatment, the convex corrugation can be prevented from being damaged under the action of the impact force of the water flow and the generated stress, so as to maintain the integrity of the protector. , prolong its service life.

Optionally, the stepped surface is inclined, and the included angle formed by the stepped surface and the horizontal plane is α, where 0°<α<90°.

The inclined arrangement of the stepped surface is conducive to the guidance of the water flow, reducing the impact of the water flow on the stepped surface during the process of flowing from the fitting pipe to the sheath tube, and at the same time, it can avoid the accumulation of water and debris.

Optionally, the thickness of the flange is 0.3-0.8 mm.

When two plastic-coated steel pipes are connected to each other, the flange should be clamped at the joint of the two plastic-coated steel pipes, and the joint gap between the two plastic-coated steel pipes is sealed by the welding process. If it is too large, it will affect the structural strength of the connection between the two plastic-coated steel pipes. If the thickness of the flanging is too small, it is easy to break, and the protector will fall off. Therefore, by limiting the thickness of the flanging, it is beneficial to ensure the structural strength of the connection between the two plastic-coated steel pipes, and at the same time, the strength of the flanging is ensured, and the flanging is prevented from breaking due to too small thickness.

Optionally, the width of the flange is 3mm-8mm.

When two plastic-coated steel pipes are connected to each other, the flange should be clamped at the joint of the two plastic-coated steel pipes, and the joint gap between the two plastic-coated steel pipes is sealed by welding. Too shallow, so that the welding area is insufficient, affecting the structural strength of the connection between the two plastic-coated steel pipes. If the width of the flanging is too small, the protector will shake in the plastic-coated steel pipe, and in severe cases, it will collide with the plastic-coated layer of the plastic-coated steel pipe and damage the plastic-coated layer. Therefore, by limiting the width of the flange to 3mm-8mm, the above-mentioned problems can be solved.

Optionally, the length of the fitting tube is greater than or equal to one-fifth of the total length of the protector.

The outer wall of the fitting pipe and the inner wall of the plastic-coated steel pipe are fitted and arranged to play the role of inlay and fixation. The length of the fitting pipe is too small, which causes the protection piece to shake when the water flows through the protection piece, and it is easy to collide with the plastic coating layer of the plastic-coated steel pipe and damage the plastic-coated layer.

Optionally, both the fitting tube and the sheath tube are stainless steel tubes.

Both the fitting pipe and the sheathing tube are structures arranged inside the plastic-coated steel pipe, and their materials are required to be anti-corrosion, rust-proof, and have a certain structural strength, and the cost should not be too high. All are made of stainless steel tube.

Description of drawings

FIG. 1 is a schematic diagram of a connection structure of a plastic-coated steel pipe provided in an embodiment of the present invention.

FIG. 2 is a schematic three-dimensional structural diagram of an integrally formed protection member provided in an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a protection member connected by a different diameter socket and insert pipe according to an embodiment of the present invention.

legend:

1. Plastic-coated steel pipe on the top; 2. Plastic-coated steel pipe on the bottom; 3. Protective parts; 4. Protection space;

21 groove; 22 bump;

31 fitting tube; 32 sheathing tube; 33 stepped surface; 34 reducing socket pipe fittings;

311 flanging; 331 concave surface; 332 convex surface.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Please refer to Figure 1, Figure 2 and Figure 3 together,

Example 1:

A plastic-coated steel pipe protector 3, comprising a connected fitting tube 31 and a sheath tube 32; an edge of one end of the fitting tube 31 is bent to the outside to form a flange 311, and the other end is connected to the sheath tube 32 connected.

In order to facilitate the description of the use of the protector 3, the structure of the plastic-coated steel pipe is briefly introduced first. A groove 21 is formed on the outer side wall of the plastic-coated steel pipe for connecting pipes, and a bump 22 is formed on the inner side wall of the plastic-coated steel pipe at a position corresponding to the groove 21 .

Based on this, when the protector 3 is installed on the plastic-coated steel pipe, the flange 311 of the fitting pipe 31 is in contact with the end face of the nozzle of the plastic-coated steel pipe, and the outer wall of the fitting pipe 31 and the inner side wall of the plastic-coated steel pipe are installed in close contact with each other. ; Between the outer side wall of the sheath tube 32 and the inner side wall of the plastic-coated steel pipe, a protective space 4 for accommodating the bump 22 is formed, and one end of the protective space 4 near the mouth of the plastic-coated steel pipe is watertightly closed.

Through the above scheme, the present invention obtains at least the following technical effects: when two plastic-coated steel pipes are connected to each other as a drainage pipe from high to low, the protection member 3 is lined in the lower plastic-coated steel pipe body, and the fitting pipe 31 is The flange 311 is clamped on the end face of the pipe mouth where the two plastic-coated steel pipes are butted. The fixing of the protector 3 in the plastic-coated steel pipe is completed by the fitting of the fitting pipe 31 and the plastic-coated steel pipe and the contact of the flange 311 . Then, a protection space 4 for accommodating the bump 22 is formed between the sheath tube 32 and the inner wall of the plastic-coated steel pipe, and the bump 22 and the damaged part of the plastic coating around the bump 22 are stored in the protection space 4 . In this way, when the plastic-coated steel pipe is used as a drainage pipe, the water flowing through the plastic-coated steel pipe from top to bottom can impact the bump 22 and the damage of the plastic-coated layer around the bump 22, so as to prevent the plastic-coated layer from falling off and blocking the pipeline, and to avoid the plastic-coated steel pipe. After the layer falls off, the pipeline is oxidized or corroded, which prolongs the service life of the plastic-coated steel pipe.

The connection process of the above-mentioned plastic-coated steel pipes and the setting method of the protection member 3 are as follows: for the convenience of description, the plastic-coated steel pipe located at the top of the two plastic-coated steel pipes is referred to as the upper plastic-coated steel pipe 1 for short, and the plastic-coated steel pipe located at the bottom is abbreviated as the bottom. Plastic coated steel pipe 2. Generally speaking, in order to realize the connection between the plastic-coated steel pipes, one end of each plastic-coated steel pipe will undergo a groove pressing process to form a groove 21 on the outer pipe wall. In actual connection, both ends of each plastic-coated steel pipe will undergo a groove pressing process to form grooves 21 on the outer pipe wall. In this embodiment, in order to protect the bumps 22 formed by the grooves on the inner pipe wall of the lower plastic-coated steel pipe 2, it is necessary to connect the lower plastic-coated steel pipe 2 to the upper plastic-coated steel pipe 1 before connecting The protection piece 3 is inserted into the pipe body of the lower plastic-coated steel pipe 2 , wherein the fitting pipe 31 of the protection piece 3 is fitted with the lower plastic-coated steel pipe 2 , and the flange 311 formed by the edge of the fitting pipe 31 is covered with the lower plastic-coated steel pipe 2 . Port sidewall. Then, the port of the upper plastic-coated steel pipe 1 that needs to be connected is butted to the port of the lower plastic-coated steel pipe 2; Next, the upper plastic-coated steel pipe 1 and the lower plastic-coated steel pipe 2 are connected through a groove connector, and then the joint gap between the two plastic-coated steel pipes is sealed and reinforced by welding.

Example 2:

On the basis of Example 1, in order to improve the sealing and drainage performance of the protective element 3, the following technical improvements have been made to the protective element 3:

In one embodiment, in order to improve the sealing performance and structural strength, the fitting tube 31 and the sheath tube 32 are integrally formed. In this way, it is possible to avoid water seepage at the connection between the fitting tube 31 and the sheath tube 32, which may cause the damage of the plastic coating layer to be eroded.

In one embodiment, in order to avoid the accumulation of water and sundries in the protection member 3, a stepped surface 33 is formed in the transition area between the fitting tube 31 and the sheath tube 32, and the stepped surface 33 intersects with the inner side wall of the fitting tube 31. The concave curved surface 331 is formed by rounding. Since the diameters of the fitting tube 31 and the sheath tube 32 are different, a stepped surface 33 will be formed in the transition area between the integrally formed fitting tube 31 and the sheath tube 32. The concave corrugation between the stepped surface 33 and the inner wall of the fitting pipe 31 is prevented from becoming a dead corner of accumulated water or sundries, so that the sundries can be discharged with the flushing of the water flow, and the accumulated water will not be stored.

In one embodiment, in order to avoid damage to the protection member 3 , the ridge formed by the intersection of the stepped surface 33 and the inner side wall of the sheath tube 32 is rounded to form the convex curved surface 332 . The convex ridge formed between the stepped surface 33 and the sheath tube 32 is the part that bears the largest impact force of the water flow. After the rounded corner treatment, the convex ridge can be prevented from being damaged under the action of the impact force of the water flow and the generated stress, so as to keep the protection part 3 integrity and prolong its service life.

In one embodiment, in order to avoid accumulation of water and sundries in the protection member 3, the stepped surface 33 is inclined and formed with an angle α formed with the horizontal plane, where 0°<α<90°. The inclined arrangement of the stepped surface 33 facilitates the guidance of water flow, and at the same time reduces the impact of the water flow on the stepped surface 33 during the process of flowing from the fitting tube 31 to the sheath tube 32 .

Example 3:

On the basis of Embodiment 1 or Embodiment 2, in order to improve the assembly stability of the protector 3, the following improvements have been made to the technical solution:

In one embodiment, in order to improve the assembly stability of the protection member 3 and reduce the impact on the connection of the two plastic-coated steel pipes, the thickness of the flange 311 is 0.3-0.8 mm. This can solve the following problems: when two plastic-coated steel pipes are connected to each other, the flange 311 needs to be clamped at the joint of the two plastic-coated steel pipes, and the joint gap of the two plastic-coated steel pipes is sealed by welding. Therefore, if the thickness of the flange 311 is too large, the welding area between the two plastic-coated steel pipes will be too large, thereby affecting the structural strength of the connection of the two plastic-coated steel pipes. However, if the thickness of the flange 311 is too small, it is easy to break, and the protection member 3 falls off.

In one embodiment, in order to improve the assembly stability of the protection member 3 , the width of the flange 311 is 3 mm-8 mm. By limiting the width of the flange to 3mm-8mm, the following technical problems can be solved: when two plastic-coated steel pipes are connected to each other, the flange 311 needs to be clamped at the joint of the two plastic-coated steel pipes, and the joint gap of the two plastic-coated steel pipes. Through the welding process for sealing, if the width of the flange 311 is too large, the gap between the two plastic-coated steel pipes will be too shallow, so that the welding area will be insufficient, and the structural strength of the connection of the two plastic-coated steel pipes will be affected. If the width of the flange 311 is too small, the protector 3 will shake in the plastic-coated steel pipe.

In one embodiment, in order to improve the assembly stability of the protector 3 , the length of the fitting tube 31 is greater than or equal to one-fifth of the total length of the protector 3 . The outer wall of the fitting tube 31 and the inner wall of the plastic-coated steel pipe are fitted and arranged to play the role of inlay and fixation. It is beneficial to avoid the phenomenon that the protection member 3 is shaken when the water flows through the protection member 3 because the length of the fitting pipe 31 is too small, and the plastic-coated layer is easily collided with the plastic-coated layer of the plastic-coated steel pipe to damage the plastic-coated layer.

In one embodiment, in order to take into account cost and practical performance, the fitting tube 31 and the sheath tube 32 are both stainless steel tubes. The fitting tube 31 and the sheath tube 32 are both structures arranged inside the plastic-coated steel pipe, and their materials are required to be anti-corrosion, rust-proof, and have a certain structural strength, and the cost should not be too high. The sheath tubes 32 are all formed by stainless steel tubes.

Example 4:

On the basis of Embodiment 1, Embodiment 2 or Embodiment 3, in order to improve the adaptability of the protection member 3, the following technical improvements are made:

In one embodiment, in order to enable the protection member to be suitable for the protection of the bumps 22 on the inner wall of the plastic-coated steel pipes of different diameters and the plastic-coated steel pipes of different thicknesses, the fitting tube 31 and the sheath tube 32 are supported by different diameters. The cannula 34 communicates. The reducing socket pipe fitting 34 is a common reducing pipe connecting piece in the prior art, which can connect two pipes of different diameters by means of threaded connection, and can be used for different diameters of plastic-coated steel pipes and different thicknesses of the bumps 22. The fitting tube 31 and the sheath tube 32 are matched, and when the fitting tube 31 or the sheath tube 32 is damaged, only the damaged part can be replaced, which saves maintenance costs.

Various technical features in all the above embodiments can be combined arbitrarily, as long as there is no conflict or contradiction between the combinations of features, but due to space limitations, they are not described one by one.

The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art can easily think of or replace other embodiments within the technical scope disclosed by the present utility model, All should be covered within the protection scope of the present invention.

The present invention is not limited to the above-mentioned embodiments, if various changes or deformations of the present invention do not depart from the spirit and scope of the present invention, if these changes and deformations belong to the claims of the present invention and the equivalent technical scope, Then the present invention also intends to include these changes and deformations.

Claims (10)

1. a plastic-coated steel pipe protector, the outer side wall of the plastic-coated steel pipe is formed with a groove for pipeline connection, and the position of the plastic-coated steel pipe inner side wall corresponding to the groove is formed with a bump; A fitting tube and a sheath tube; an edge of one end of the fitting tube is bent to the outside to form a flanging, and the other end is connected to the sheath tube; When the protector is installed on the plastic-coated steel pipe, the flange of the fitting pipe is in contact with the end face of the mouth of the plastic-coated steel pipe, and the outer wall of the fitting pipe is fitted with the inner side wall of the plastic-coated steel pipe; A protection space for accommodating bumps is formed between the outer side wall and the inner side wall of the plastic-coated steel pipe, and one end of the protection space close to the nozzle of the plastic-coated steel pipe is watertightly closed. 2 . The plastic-coated steel pipe protector according to claim 1 , wherein the fitting pipe and the protective sleeve are communicated with each other through a different-diameter socket pipe fitting. 3 . 3 . The plastic-coated steel pipe protector according to claim 1 , wherein the fitting tube and the sheath tube are integrally formed. 4 . 4 . The plastic-coated steel pipe protector according to claim 3 , wherein a stepped surface is formed in the transition area between the fitting tube and the sheath tube, and the ridge formed by the intersection of the stepped surface and the inner side wall of the fitting tube is rounded. 5 . Form a concave surface. 5 . The plastic-coated steel pipe protector according to claim 4 , wherein the ridge formed by the intersection of the stepped surface and the inner side wall of the protective tube is rounded to form a convex curved surface. 6 . 6 . The plastic-coated steel pipe protector according to claim 4 , wherein the stepped surface is inclined and the angle formed with the horizontal plane is α, wherein 0°<α<90°. 7 . 7 . The plastic-coated steel pipe protector according to claim 1 , wherein the thickness of the flange is 0.3-0.8 mm. 8 . 8 . The plastic-coated steel pipe protector according to claim 1 , wherein the width of the flange is 3mm-8mm. 9 . 9 . The plastic-coated steel pipe protector according to claim 1 , wherein the length of the fitting pipe is greater than or equal to one-fifth of the total length of the protector. 10 . 10 . The plastic-coated steel pipe protector according to claim 1 , wherein the fitting pipe and the protective sleeve are both stainless steel pipes. 11 .

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