CN217683848U

CN217683848U - Reactor barrel slow flow type flange connecting pipe

Info

Publication number: CN217683848U
Application number: CN202221057414.4U
Authority: CN
Inventors: 陈飞; 马武江; 杨婧婧
Original assignee: SHANGHAI XINMIN (DONGTAI) HEAVY FORGING CO Ltd
Current assignee: SHANGHAI XINMIN (DONGTAI) HEAVY FORGING CO Ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-10-28
Anticipated expiration: 2032-05-06

Abstract

The utility model discloses a reactor barrel sluggish flow formula flange joint, including the takeover barrel to and set up the takeover of intaking and the takeover of going out on the takeover barrel wall, the takeover barrel, the takeover of intaking and the takeover of going out forge to a whole: the inner wall of the water inlet pipeline of the water inlet connecting pipe is provided with a spiral rib, and an included angle alpha = 20-25 degrees is formed between the central line of the water inlet pipeline and the diameter of the connecting pipe cylinder; the water outlet connecting pipe is provided with a water outlet conical hole section and a water outlet circular hole section, and the central lines of the water outlet conical hole section and the water outlet circular hole section which are communicated with each other are positioned on the diameter of the connecting pipe cylinder body; the upper barrel end of the connecting pipe barrel body is provided with a step hole, and the lower barrel end of the connecting pipe barrel body is provided with a step bottom end. At least two spiral ribs are arranged on the inner pipe wall of the water inlet pipeline. The flange connecting pipe has the advantages that the structure of a forged piece is uniform, the metal streamline is complete, the impact force of inflow water can be relieved, and the nonuniformity of the internal pressure of the reaction cylinder is reduced.

Description

Reactor barrel slow flow type flange connecting pipe

Technical Field

The utility model relates to a nuclear reactor pressure vessel structure especially relates to an improvement of nuclear reactor pressure vessel flange pipe section structure.

Background

The reactor pressure vessel is a sealed vessel which is used for placing a reactor core of a nuclear reactor and bearing the operating pressure, plays a role of a pressure boundary and is used for supporting and containing the reactor core of the reactor and providing a coolant channel for fuel of the reactor core, and the reactor pressure vessel needs to bear various operating transient and accident condition loads when operating under the working conditions of high temperature, high pressure and high irradiation for a long time, and the structural integrity of the reactor pressure vessel is vital to the safety of a reactor structure.

The reactor pressure vessel is formed by welding a pressure vessel top cover, a pipe connecting section cylinder, a reactor core cylinder and a lower end enclosure, and the pipe connecting section is easy to generate stress concentration and break due to geometric discontinuity of the pipe connecting section and is the weakest part in the pressure vessel structure. The existing reactor pressure vessel is based on a forging manufacturing technology, a connecting pipe section is formed by connecting a cylinder forging and a connecting pipe forging in an inserted all-welded mode, on one hand, the wall thickness of the connecting pipe assembly is large, welding difficulty is large, requirements are high, the manufacturing period is long, on the other hand, the uniformity of a connecting pipe structure is poor, a metal streamline cannot achieve continuity and integrity, and the mechanical property of a welded part is poor. The existing connecting pipe cooling water is input from a connecting pipe inlet pipe, descends in an annular gap between the inner wall of a pressure vessel and a reactor core cradle, ascends through a reactor core supporting plate and a reactor core lower grid plate after reaching the bottom of the pressure vessel, carries heat out by flowing through the reactor core, passes through an upper grid plate and is discharged from a connecting pipe outlet pipeline. At this in-process cooling water through the water inlet pipe inflow can produce very big impulsive force to reactor core and reactor core basket etc. long-term impulsive force effect not only can bring serious damage to the facility in the pressure vessel, can produce great pressure inhomogeneous when intaking moreover and flow into the reactor core, finally causes the increase of the internal pressure drop of reactor core.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a reactor barrel slow flow type flange is taken over is provided, and not only the forging tissue is even, the metal streamline is complete, can alleviate the impact force of rivers moreover, reduces the inhomogeneity of reaction barrel internal pressure.

In order to solve the technical problem, the utility model discloses a reactor barrel sluggish flow formula flange is taken over, including the takeover barrel to and set up the takeover of intaking and the takeover of going out on the takeover barrel wall, the takeover barrel, the takeover of intaking and the takeover of going out are forged to be a whole: the inner pipe wall of the water inlet pipe of the water inlet connecting pipe is provided with a spiral rib, and an included angle alpha = 20-25 degrees is formed between the central line of the water inlet pipe and the diameter of the connecting pipe cylinder; the water outlet connecting pipe is provided with a water outlet conical hole section and a water outlet circular hole section, and the central lines of the water outlet conical hole section and the water outlet circular hole section which are communicated with each other are positioned on the diameter of the connecting pipe cylinder body; the upper barrel end of the connecting pipe barrel body is provided with a step hole, and the lower barrel end of the connecting pipe barrel body is provided with a step bottom end.

Preferably, the connecting pipe cylinder is of a cylindrical structure, and the stepped hole is located in the inner hole wall of the upper cylinder end of the connecting pipe cylinder.

Preferably, the upper barrel end face of the adapter barrel is provided with a bolt hole.

Preferably, the water outlet conical hole channel and the water outlet circular hole section which are positioned on the same central line are respectively positioned on the inner side and the outer side of the tube wall of the connecting tube cylinder.

Preferably, at least two spiral ribs are arranged on the inner pipe wall of the water inlet pipe.

Preferably, the spiral rib has a rectangular cross section.

Preferably, the included angle α =22.5 ° between the central line of the water inlet pipe and the diameter of the adapter cylinder.

Preferably, the wall of the connecting tube cylinder body is provided with two water inlet connecting tubes and two water outlet connecting tubes.

In the structure, the connecting pipe cylinder body, the water inlet connecting pipe and the water outlet connecting pipe are forged into a whole by a forging method, and a complete metal streamline and a uniform forged piece structure are formed inside a metal structure of the whole connecting pipe part, so that the mechanical property of the connecting pipe part is greatly improved, and the connecting pipe part can bear severe working conditions such as high temperature, high pressure, alternating load and the like. The spiral ribs are arranged on the inner pipe wall of the water inlet pipe of the water inlet connecting pipe, and the central line of the water inlet pipe and the diameter of the connecting pipe cylinder are arranged at an included angle, so that water flow can enter the pressure cylinder in a spiral manner and at a certain angle, the impact effect of the water flow on a reactor core is reduced, the pressure at the joint of the water inlet pipe part and the cylinder is reduced, and the pressure loss is avoided; the spiral water inlet flow can also eliminate momentum loss caused by turbulent flow, so that the water pressure is reduced before entering the barrel part, the pressure drop of water flowing into the reactor core from the pipe connecting port is reduced, the water outlet flow at the water outlet connecting pipe is guided to the water outlet circular hole section by the water outlet conical hole section, the water outlet is more stable, and the water outlet pressure is uniform. Still owing to be equipped with the step hole at the last barrel end of taking over the barrel, can make pressure barrel top cap insert the location accurately, set up the step bottom at the lower barrel end of taking over the barrel, make again that the pipeline section barrel can firmly weld with the reactor core barrel and be connected as an organic whole.

Drawings

The reactor barrel slow flow type flanged joint of the present invention will be further described with reference to the accompanying drawings and the specific embodiments.

FIG. 1 is a schematic structural view of a slow flow type flanged joint of a reactor barrel according to an embodiment of the present invention;

fig. 2 is a schematic view of the cross-sectional structure a-a of fig. 1.

In the figure, 1-connecting pipe cylinder, 2-spiral rib, 3-water inlet pipe, 4-water inlet connecting pipe, 5-step hole, 6-water outlet taper hole section, 7-water outlet connecting pipe, 8-water outlet round hole section, 9-step bottom end and 10-bolt hole.

Detailed Description

As shown in fig. 1 and 2, in the reactor barrel slow flow type flange connection tube, the connection tube barrel 1 is of a cylindrical structure, and two water inlet connection tubes 4 and two water outlet connection tubes 7 are arranged on the outer barrel wall of the connection tube barrel 1. The central position of the water inlet connecting pipe 4 is provided with a water inlet pipeline 3 leading to the cylinder cavity of the connecting pipe cylinder body 1, the central position of the water outlet connecting pipe 7 is also provided with a water outlet pipeline leading to the cylinder cavity of the connecting pipe cylinder body 1, the water outlet pipeline comprises a water outlet conical hole section 6 and a water outlet circular hole section 8 which are positioned on the same central line and are mutually communicated, the central line is positioned on the cylinder diameter of the connecting pipe cylinder body 1, the water outlet conical hole section 6 is positioned on one side of the inner wall of the cylinder body, and the water outlet circular hole section 8 is positioned on one side of the outer wall of the cylinder body. The angle α =22.5 ° between the center line of the water inlet pipe 3 and the diameter of the adapter cylinder 1 is preferably controlled to be between 20 ° and 25 °. Three-head spiral ribs 2 are arranged on the inner pipe wall of the water inlet pipeline 3, each spiral rib 2 has the same spiral lead angle, and the cross section of each spiral rib 2 is rectangular. The inner pipe wall of the water inlet pipe 3 is not limited to be provided with three-head spiral ribs, but at least two or more spiral ribs are arranged.

The inner hole wall of the upper tube end of the connecting tube cylinder body 1 is provided with a step hole 5, and the tube end face of the connecting tube cylinder body 1 is also provided with a bolt hole 10. The bolt holes 10 are located on the same circumference, and the bolt holes 10 are used for tightening the connecting bolts. The lower tube end of the connecting tube body 1 is provided with a step bottom end 9, and the step bottom end 9 adopts a step structure.

Claims

1. The utility model provides a reactor barrel slow flow type flange is taken over, includes takes over barrel (1) to and set up water inlet pipe (4) and play water pipe (7) on taking over barrel (1) section of thick bamboo wall, its characterized in that: the connecting pipe cylinder body (1), the water inlet connecting pipe (4) and the water outlet connecting pipe (7) are forged into a whole: the inner pipe wall of a water inlet pipe (3) of the water inlet connecting pipe (4) is provided with a spiral rib (2), and an included angle alpha = 20-25 degrees is formed between the central line of the water inlet pipe (3) and the diameter of the connecting pipe cylinder body (1); the water outlet connecting pipe (7) is provided with a water outlet conical hole section (6) and a water outlet circular hole section (8), and the central lines of the water outlet conical hole section (6) and the water outlet circular hole section (8) which are communicated with each other are positioned on the diameter of the connecting pipe cylinder body (1); the upper barrel end of the connecting pipe barrel body (1) is provided with a step hole (5), and the lower barrel end of the connecting pipe barrel body (1) is provided with a step bottom end (9).

2. The reactor barrel sluggish flow flanged joint of claim 1, wherein: the connecting pipe cylinder body (1) is of a cylindrical structure, and the stepped hole (5) is formed in the inner hole wall of the upper cylinder end of the connecting pipe cylinder body (1).

3. The reactor barrel sluggish flow flanged joint of claim 1, wherein: and a bolt hole (10) is formed in the end face of the upper barrel of the connecting pipe barrel body (1).

4. The reactor barrel sluggish flow flanged joint of claim 1, 2 or 3, wherein: the water outlet taper hole section (6) and the water outlet circular hole section (8) which are positioned on the same central line are respectively positioned on the inner side and the outer side of the tube wall of the connecting tube cylinder body (1).

5. The reactor barrel sluggish flow flanged joint of claim 1, 2 or 3, wherein: the inner pipe wall of the water inlet pipeline (3) is at least provided with two spiral ribs (2).

6. The reactor barrel sluggish flow flanged joint of claim 5, wherein: the cross section of the spiral rib (2) is rectangular.

7. The reactor barrel sluggish flow flanged joint of claim 1, 2 or 3, wherein: the included angle alpha =22.5 degrees is formed between the central line of the water inlet pipeline (3) and the diameter of the connecting pipe cylinder body (1).

8. The reactor barrel sluggish flow flanged joint of claim 1, wherein: the wall of the connecting pipe cylinder body (1) is provided with two water inlet connecting pipes (4) and two water outlet connecting pipes (7).