CN213299203U

CN213299203U - Welded connection plastic corrugated pipe compensator

Info

Publication number: CN213299203U
Application number: CN202021928733.9U
Authority: CN
Inventors: 徐力
Original assignee: Dalian Port Design & Research Institute Co ltd
Current assignee: Dalian Port Design & Research Institute Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-05-28
Anticipated expiration: 2030-09-07

Abstract

The utility model provides a welded connection plastic bellow compensator, include: the compensation unit is in a three-layer composite vertical corrugated pipe structure, and the pipe wall structure of the compensation unit is formed by a first plastic structure layer positioned on the outer layer, a stainless steel structure layer positioned on the middle layer and a second plastic structure layer positioned on the inner layer through hot pressing or bonding; the pipe wall structure of the welding end is a single-layer plastic structure layer or the same as the pipe wall structure of the compensation unit. The utility model discloses solution plastic conduit that can be fine reduces the maintenance cost because the flange leaks in the valve well that pipeline expend with heat and contract with cold arouses, is favorable to the popularization of technique, can full play plastic tubing's advantage to reach and reduce direct-burried heating pipeline overall cost, improve the purpose of heating security.

Description

Welded connection plastic corrugated pipe compensator

Technical Field

The utility model relates to a bellows especially relates to a welded connection plastic bellow compensator.

Background

The plastic pipe has the advantages of strong corrosion resistance, large anti-settling capacity, small flow specific friction and the like, the application range of the plastic pipe is gradually expanded, and more application examples of outdoor low-temperature heating pipelines appear in recent years.

In the existing technical regulation of urban heating direct-buried hot water pipelines, CJJ/T81-2013, item 4.3.2, the valve is a steel welded valve capable of bearing the axial load of the pipeline, and the measure can avoid the leakage of a flange in a valve well.

However, the valves in the valve wells of the existing directly-buried plastic pipelines with larger diameters (generally greater than DN50) are connected with the plastic pipelines by flanges, the flanges in the valve wells are easy to leak after being used for several years, and the analysis reason is mainly flange gasket looseness caused by repeated expansion and contraction of the plastic pipelines.

Compared with the common carbon steel pipe, the plastic pipe has a larger linear expansion coefficient (about 10-15 times). In the operation process, the plastic pipes in the valve well and in the certain ranges of the two sides of the valve well are in relatively free telescopic states, and when the temperature of the inside and the outside changes, the plastic pipes can expand and contract repeatedly, so that the flange connection part in the valve well is loosened.

According to the actual engineering investigation condition, the plastic water supply pipeline is influenced by expansion and contraction of the pipeline, leakage is easy to occur at the flange joint of the valve well in 3-5 years and 2-3 years of plastic low-temperature heating pipelines, the water supply safety is reduced, and resource waste is also caused.

The corrugated telescopic short pipe is arranged in the valve well, so that the problem of flange leakage caused by repeated expansion and contraction of the plastic pipeline can be solved. But the existing corrugated pipe products in the market are all flange connection, are made of metal materials or other composite materials, are influenced by factors such as corrosion resistance, use strength and flange connection forms, have general use effects and poor durability, cannot well solve the problem of valve flanges, and particularly, the problem of valve leakage is more prominent along with popularization and application of plastic pipelines in outdoor low-temperature heating pipelines.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned technical problem, a welded connection plastic bellows compensator is provided. The utility model mainly utilizes the welding end heads at the two sides to change the flange connection mode of the prior stainless steel corrugated pipe compensator, thereby avoiding the adverse factors of flange connection and ensuring the quality; the compensation unit adopts the vertical bellows structure of three-layer composite, and the ectonexine material adopts heat-resisting polyethylene or PPR material, and the intermediate level adopts stainless steel material, can reduce and avoid the compensator plastic deformation to appear when increasing the compensator pressure-bearing. The utility model discloses a technical means as follows:

a welded connection plastic bellow compensator comprising: the pipe wall structure of the compensation unit is integrally formed by a first plastic structure layer positioned on the outer layer, a stainless steel structure layer positioned on the middle layer and a second plastic structure layer positioned on the inner layer through hot pressing or bonding, and the stainless steel structure layer is formed by thin-wall stainless steel in a pressing mode; the pipe wall structure of the welding end is a single-layer plastic structure layer or the same as the pipe wall structure of the compensation unit.

Furthermore, the welding end is connected with the plastic pipeline in a hot melting or electromagnetic welding mode.

Further, the corrugations of the compensation unit are not inclined and are perpendicular to the axis.

Furthermore, the corrugated height, the corrugated space and the composite structure thickness of the corrugated pipe compensator are determined by calculation in combination with the diameter and the pressure bearing condition of the pipeline.

Furthermore, the first plastic structure layer and the second plastic structure layer are made of heat-resistant polyethylene or PPR.

Furthermore, when the pipe wall structure of the welding end is a single-layer plastic structure layer, the material of the pipe wall structure is heat-resistant polyethylene or PPR material.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model provides a welded connection plastic bellow compensator, solution plastic conduit that can be fine is because the flange leaks in the valve well that pipeline expend with heat and contract with cold arouses, can be with the fine problem of revealing of valve junction in the valve well when solution plastic conduit low temperature (≦ 85 ℃) direct-burried heating, reduce the maintenance cost, be favorable to the popularization of technique, advantage that can full play plastics tubular product to reach and reduce direct-burried heating pipe overall cost, improve the purpose of heating security.

2. The welded connection plastic corrugated pipe compensator provided by the utility model is made of the same material as the plastic pipeline, has strong corrosion resistance, is firm and durable, is made of the plastic material made of heat-resistant polyethylene or PPR material, and meets the temperature resistance requirement of the heating pipeline or the sanitary condition requirement of the domestic water supply pipeline; the installation mode is the same as that of a plastic pipeline, welding connection is adopted, namely, hot melting or electromagnetic welding and the like can be adopted in the same pipeline welding mode, the installation is convenient, and the number of accessories is small. And an illegal flange connection mode is adopted, so that new leakage points are prevented from being added due to the addition of the compensator.

3. The utility model provides a welded connection plastic bellow compensator compares other non-metallic material bellows, and its intensity is high. Simple and practical, and does not need professional design.

4. The utility model provides a welded connection plastic bellow compensator adopts and accords with the preparation of drinking water plastics material, can be applied to plastics water supply pipe and low temperature heating pipe way. Adopt composite construction, both sides are the plastics material, and the steel band is pressed from both sides to the inside, can reduce and avoid the compensator to appear plastic deformation when increasing compensator intensity. The existing stainless steel corrugated pipe compensator is changed to be in a flange connection mode, and the ends on the two sides are connected with a pipeline in a hot melting or electromagnetic welding mode, so that the adverse factors of flange connection are avoided, and the quality is guaranteed.

5. The utility model provides a welded connection plastic bellow compensator, simple structure adopts the integrated design, and the mill's processing is accomplished, guarantees product quality.

6. The utility model provides a welded connection plastic bellow compensator adopts the compound vertical bellows structure of three-layer, and inside and outside for heat-resisting polyethylene or PPR material, centre accompanies individual layer thin wall corrosion resistant plate, through the integrative (hot pressing or bonding) machine-shaping of mill, can reduce and avoid the compensator plastic deformation to appear when increasing the compensator pressure-bearing.

Based on the above reason the utility model discloses can extensively promote in fields such as plastics water supply pipe and low temperature heating pipe way.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

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

Fig. 2 is an enlarged view of a point a in fig. 1.

Fig. 3 is a schematic view of the practical use of the present invention.

In the figure: 1. welding an end head; 2. a compensation unit; 21. a first plastic structural layer; 22. a stainless steel structural layer; 23. a second plastic structural layer; 3. the plastic corrugated pipe compensator is connected by welding; 4. the flange is connected with a valve; 5. a plastic pipe; 6. a valve well.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-3, the utility model provides a welded connection plastic corrugated pipe compensator, include: compensation unit 2 and the welding end 1 of setting at compensation unit 2 both ends, both sides link to each other through hot melt or electromagnetic welding mode between welding end 1 and plastic conduit 5, compensation unit 2 is the vertical bellows structure of three-layer composite, and its tubular wall structure is by lieing in outer first plastic construction layer 21, lieing in medial stainless steel structural layer 22 and lieing in the inlayer second plastic construction layer 23 through hot pressing or bonding integrated processing shaping, the stainless steel structural layer is by thin wall stainless steel compression moulding, wherein, first plastic construction layer 21 with the material of second plastic construction layer 23 is heat-resisting polyethylene or PPR material. The pipe wall structure of the welding end 1 is a single-layer plastic structure layer, or is the same as the pipe wall structure of the compensation unit 2, wherein when the pipe wall structure of the welding end 1 is the single-layer plastic structure layer, the material is heat-resistant polyethylene or PPR material.

The corrugation of the compensation unit 2 has no inclination and is vertical to the axis, and the axial stress condition is better.

The corrugated height, the corrugated interval and the composite structure thickness of the corrugated pipe compensator are determined by calculation in combination with the diameter and the pressure bearing condition of the pipeline.

Fig. 3 is a schematic view of the practical use of the present invention. The utility model discloses the welded end 1 of 3 both sides of welded connection bellows compensator passes through hot melt or electromagnetic welding with both sides plastic conduit 5 respectively and is connected, and flange joint valve 4 still adopts the steel valve to adopt flange joint with plastic conduit 5 in the valve well, and the pipeline passes through 6 departments of valve well and adopts conventional processing can.

At present, no plastic corrugated pipe compensator special for low-temperature direct-buried heating pipelines and outdoor water supply pipelines exists in the market. The utility model is made of drinking water-compatible plastic materials, and can be applied to plastic water supply pipelines and low-temperature heating pipelines; the compensator adopts a composite structure, the inside and the outside are made of plastic materials, and the steel belt is clamped inside, so that the strength of the compensator can be improved, and the plastic deformation of the compensator can be reduced and avoided.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A welded connection plastic bellow compensator, comprising: the pipe wall structure of the compensation unit comprises a compensation unit (2) and welding end heads (1) arranged at two ends of the compensation unit (2), wherein the welding end heads (1) at two sides are connected with a plastic pipeline (5), the compensation unit (2) is of a three-layer composite vertical corrugated pipe structure, the pipe wall structure of the compensation unit is integrally processed and formed by a first plastic structure layer (21) positioned on the outer layer, a stainless steel structure layer (22) positioned on the middle layer and a second plastic structure layer (23) positioned on the inner layer through hot pressing or bonding, and the stainless steel structure layer (22) is formed by thin-wall stainless steel in a pressing mode; the pipe wall structure of the welding end (1) is a single-layer plastic structure layer or the same as that of the compensation unit (2).

2. The welded connection plastic bellow compensator according to claim 1, characterized in that the welded end (1) is connected with the plastic pipe (5) by hot melting or electromagnetic welding.

3. Welded connection plastic bellow compensator according to claim 1, characterized in that the corrugations of the compensating unit (2) are not inclined, perpendicular to the axis.

4. The welded connection plastic corrugated pipe compensator of claim 1, wherein the corrugated height, corrugated spacing, composite structure thickness, combined pipe diameter, and pressure conditions of the corrugated pipe compensator are determined by calculation.