CN214997829U

CN214997829U - Novel communicating pipe of 300MW unit

Info

Publication number: CN214997829U
Application number: CN202120815519.0U
Authority: CN
Inventors: 李宝山; 李佳文; 谭凤洁; 高东伟; 辛昊飞
Original assignee: Datang Jixi No2 Co Generation Co ltd
Current assignee: Datang Jixi No2 Co Generation Co ltd
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-12-03
Anticipated expiration: 2031-04-21

Abstract

Novel communicating pipe of 300MW unit. The guide vanes are adopted, so that the problems of loss of the steam flow-around guide vanes and reliability of the guide vanes exist. The utility model discloses the constitution includes: the shrimp back type communicating pipe (4) and an extension pipe (1) which is welded at the left elbow of the shrimp back type communicating pipe and is horizontally arranged; the extension pipe comprises a compensation pipe head (6) and an end seat (5), the pipe head seat of the compensation pipe head is connected with the end seat through a split bolt (7), and the arc end part of the compensation pipe head is welded with the elbow of the shrimp-back-shaped communication pipe; the compensating joint (2) is arranged on the compensating pipe head and the horizontal section of the shrimp back type communicating pipe. The utility model is used for the novel communicating pipe of 300MW unit.

Description

Novel communicating pipe of 300MW unit

Technical Field

The utility model relates to a novel communicating pipe of 300MW unit.

Background

The communicating pipe adopted at present is a traditional structure provided for matching of a steam turbine manufacturing factory, and in the flowing process that steam discharged by a middle pressure cylinder is guided into a low pressure cylinder through a middle and low pressure communicating pipe, the steam flows in the communicating pipe and is subjected to 90-degree turning twice. In order to reduce flow loss, a group of guide vane rings consisting of a plurality of vanes is added at the butt joint corner of each vertical pipeline and each horizontal pipeline of the communicating pipe, so that the steam flow changes the direction smoothly. The guide vane has various forms, but no matter which form, as long as the guide vane is adopted, the loss problem of the steam circumfluence guide vane and the reliability problem of the guide vane exist. The guide vane can prevent steam separation at the sharp corner to a certain extent through analysis. When fluid passes through the guide vane cascade, the change of the flow direction can cause the centrifugal vortex phenomenon and also can cause the turbulence in the fluid, and the change can generate noise, vibration and instability, even lead to the blade fracture and the integral falling of the guide vane cascade and rush into the low-pressure cylinder in serious conditions. The fallen guide vane is easy to cause large-area damage accidents of the flow passage part of the low-pressure cylinder of the steam turbine, and the safe operation of the unit is critical.

Disclosure of Invention

The utility model aims at solving the reliability problem that there are steam to flow around guide vane's loss problem and guide vane itself in present communicating pipe, provide one kind and reduce the loss that flows, improve the novel communicating pipe of 300MW unit of steam turbine efficiency simultaneously.

The above purpose is realized by the following technical scheme:

a novel communication pipe of a 300MW unit comprises a shrimp back type communication pipe and a horizontally arranged extension pipe welded at a left side elbow of the shrimp back type communication pipe;

the extension pipe comprises a compensation pipe head and an end seat, the pipe head seat of the compensation pipe head is connected with the end seat through a split bolt, and the arc end part of the compensation pipe head is welded with the elbow of the shrimp-back-shaped communication pipe;

the compensating joint is arranged on the compensating pipe head and at the horizontal section of the shrimp back type communicating pipe.

The novel communicating pipe of 300MW unit, shrimp back of the body type communicating pipe elbow department circular arc back of the body arc on seted up a plurality of through-holes.

Has the advantages that:

1. the utility model discloses an extension pipe and shrimp back of the body type communicating pipe welded structure reduce the loss that flows, have improved steam turbine efficiency.

2. The utility model discloses can noise abatement and vibration, can improve steam flow characteristic when improving the security, reduce the loss that flows.

3. The utility model discloses an all install the compensation festival at the horizontal segment department of compensation tube head and shrimp back of the body type communicating pipe, can compensate the inflation, guarantee unit safety and stability and move.

Description of the drawings:

FIG. 1 is a front view of the present invention;

fig. 2 is a side view of the present invention;

FIG. 3 is a schematic view of the structure of the extension pipe;

in the figure: 1. an extension pipe; 2. a compensation section; 3. a through hole; 4. a shrimp-back type communicating tube; 5. an end seat; 6. a compensating pipe head; 7. oppositely pulling the bolts; 8. a pipe head seat.

The specific implementation mode is as follows:

example 1:

the utility model provides a novel communicating pipe of 300MW unit, characterized by: the novel communication pipe of the 300MW unit consists of a shrimp back type communication pipe 4 and a horizontally arranged extension pipe 1 welded at the left elbow of the shrimp back type communication pipe;

the extension pipe comprises a compensation pipe head 6 and an end seat 5, the pipe head seat of the compensation pipe head is connected with the end seat through a split bolt 7, and the arc end part of the compensation pipe head is welded with the elbow of the shrimp-back-shaped communicating pipe;

the compensating joint 2 is arranged on the compensating pipe head and the horizontal section of the shrimp back type communicating pipe.

Example 2:

according to embodiment 1 the novel communicating pipe of 300MW unit, the arc back arc of the elbow of the shrimp back type communicating pipe is provided with a plurality of through holes 3.

Claims

1. The utility model provides a novel communicating pipe of 300MW unit, characterized by: the novel communication pipe of the 300MW unit consists of a shrimp back type communication pipe and a horizontally arranged extension pipe welded at the left elbow of the shrimp back type communication pipe;

2. The novel communicating tube of 300MW unit according to claim 1, characterized in that: and a plurality of through holes are formed in the arc back arc at the elbow of the shrimp back type communicating pipe.