CN211289156U - 45-degree Y-shaped polyethylene reducing tee pipe fitting - Google Patents

Abstract

The utility model relates to a 45 degree Y type polyethylene reducing tee bend pipe fitting, its concrete structure includes five parts: a main pipe welding end (1); a pipe body reinforcement zone (2); a variable-diameter inner reinforcing region (3); a variable-diameter outer reinforcing region (4); a branch pipe welding end (5). The utility model has the advantages of reasonable design, have higher compressive property and excellent through-flow capacity, can extensively be used for fields such as feedwater, oil, chemical industry, mining, drainage and irrigation, sewage discharge.

Description

45-degree Y-shaped polyethylene reducing tee pipe fitting

Technical Field

The utility model relates to a plastic conduit field, concretely relates to 45 degrees Y type polyethylene reducing tee bend pipe fitting.

Background

High Density Polyethylene (HDPE) pipelines have the advantages of corrosion resistance, excellent anti-seismic performance, long service life, convenient construction and the like, and are widely applied to municipal pipe network transformation, town gas, chemical process pipelines, power plant chlorination pipelines and cooling pipeline systems in recent years. Particularly, in-service metal pipelines such as carbon steel pipes, steel pipes and the like in three loops of the nuclear power plant in China have serious phenomena of corrosion, scaling and the like along with the accumulation of service time. At present, nuclear-grade HDPE pipelines are being designed to replace original carbon steel pipes and steel pipes.

However, the existing steel pipes in service in the nuclear power plant are designed according to the corresponding IPS size series, and under the condition of modification and replacement, 45-degree Y-shaped polyethylene reducing tee pipe fittings with IPS inch series sizes, particularly wall thickness pressure SDR7 series, are not available in China at present. Therefore, it is necessary to provide a 45-degree Y-shaped polyethylene reducing tee pipe fitting which is convenient to meet the requirements of field use according to actual engineering application requirements.

Disclosure of Invention

In order to solve the problem, the utility model provides a 45 degree Y type polyethylene reducing tee bend pipe fitting.

The technical scheme of the utility model is that: a45-degree Y-shaped polyethylene reducing tee pipe fitting mainly comprises a main pipe welding end (1); a pipe body reinforcement zone (2); a variable-diameter inner reinforcing region (3); a variable-diameter outer reinforcing region (4); a branch pipe welding end (5). The pipe fitting is characterized in that the whole pipe fitting is integrally formed by injection molding, and special wall thickness enhancement design is adopted in areas which are easy to generate stress concentration, such as the reducing inner enhancement area (3) and the reducing outer enhancement area (4). The technical advantages of the utility model are that: (1) the stress concentration area of the whole reducing tee pipe fitting is easy to appear, and the wall thickness enhancement design is adopted, so that the mechanical strength and the pressure resistance of the whole pipe fitting are ensured; (2) the whole reducing tee pipe fitting is integrally formed by injection molding, and the reducing and rotating angle positions are in smooth transition by adopting circular arc chamfers, so that the through-flow capacity is good; (3) the whole reducing tee pipe fitting is reasonable in size and structural design, the integrated use effect of the tee joint, the reducing tee joint and the elbow can be achieved in a limited space, the space utilization rate is high, and the installation cost is effectively reduced.

Drawings

Fig. 1 is a front view of the present invention.

Detailed Description

1. The polyethylene raw material adopts a melt index of 0.26-0.4g/10min (5kg/190 ℃), and the density is 0.956-0.968g/cm³Then dehumidifying and drying for 2.5-3h at 80 ℃ by using dehumidifying and drying equipment to ensure that the moisture of the raw material is controlled below 50 ppm.

2. Screw plasticization

Utilize special injection molding machine of polyethylene pipe fitting, after installing injection mold, carry out the plastify to the raw materials that the preliminary treatment was extruded, screw rod plastify temperature sets for: the first zone is 185-plus-195 ℃, the second zone is 185-plus-195 ℃, the third zone is 195-plus-205 ℃, the temperature of the fourth zone and the fifth zone is 200-plus-210 ℃, the temperature of the sixth zone is 210-plus-220 ℃, the temperature of the seventh zone is 210-plus-215 ℃, and the temperature of the eighth zone is 200-plus-210 ℃.

3. Injection moulding

Injecting the molten polyethylene into a mold cavity through a nozzle, wherein the injection pressure is 35-40MPa, the injection amount is 4-6 liters/second, and the injection time is 8-12 s.

4. Pressure maintaining device

The pressure maintaining pressure is 18-25MPa, the pressure maintaining flow is 1-3L/s, and the pressure maintaining time is 200-350 s.

5. Cooling down

The cooling time is 700 plus 900s, and the die is provided with a die temperature controller and a cooling water circulation system, so that the temperature of the die is ensured to be 50-55 ℃, the reducing tee pipe fitting is uniformly cooled in the die cavity, and the internal stress is relieved.

6. Demoulding and forming

And (3) placing the demoulded reducing tee pipe at room temperature, supporting the reducing tee pipe by a special die sleeve, cooling the reducing tee pipe for enough time, turning redundant parts such as a sprue runner and the like by using a lathe, and finishing the forming of the reducing tee pipe.

7. The above technical solution is only one embodiment of the present invention, and for those skilled in the art, various modifications or variations can be easily made on the basis of the application method and principle disclosed in the present invention, and not limited to the structure described in the above specific embodiments of the present invention, so that the above described manner is only preferable, and not restrictive.

Claims (5)

1. A45-degree Y-shaped polyethylene reducing tee pipe mainly comprises five parts: a main pipe welding end (1); a pipe body reinforcement zone (2); a variable-diameter inner reinforcing region (3); a variable-diameter outer reinforcing region (4); branch pipe welding end (5), characterized by: the included angle between the axis of the main pipe welding end (1) and the axis of the branch pipe welding end (5) is 45 degrees, wherein the outer diameter of the main pipe welding end is 168.28mm, the outer diameter of the branch pipe welding end is 114.3mm, and the wall thickness pressure grade is SDR 7.

2. The 45-degree Y-shaped polyethylene reducing tee pipe fitting as claimed in claim 1, wherein: the wall thickness of the pipe body reinforcing area (2) is increased by about 10 percent compared with the pipe wall thickness of the main pipe welding end (1), and the pipe body reinforcing area and the main pipe welding end are in R1.5 chamfer transitional connection.

3. The 45-degree Y-shaped polyethylene reducing tee pipe fitting as claimed in claim 1, wherein: the reducing inner reinforcing area (3) is in chamfer transition connection with the inner wall of the main pipe welding end (1) by adopting an R10 chamfer, and the inner wall and the outer wall of the branch pipe welding end (5) have an inclination angle of 1 degree, so that the wall thickness at the position of the reducing inner reinforcing area (3) is more than 90% of the wall thickness at the position of the branch pipe welding end (5).

4. The 45-degree Y-shaped polyethylene reducing tee pipe fitting as claimed in claim 1, wherein: the reducing outer reinforcing area (4) and the pipe body reinforcing area (2) are in transition by adopting an R5 arc chamfer, and the wall thickness is 30% stronger than that of the pipe wall of the branch pipe welding end (5).

5. The 45-degree Y-shaped polyethylene reducing tee pipe fitting as claimed in claim 1, wherein: the 45-degree Y-shaped polyethylene reducing tee pipe fitting is integrally formed by injection molding and is made of polyethylene.

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