Piping

A technology for piping and main piping, applied in the direction of pipes, pipe elements, rigid pipes, etc., can solve problems such as insufficient cavitation flow control, piping thermal fatigue, and adverse effects of piping, so as to prevent adverse effects, prevent thermal fatigue, and suppress intrusive effect

Inactive Publication Date: 2010-01-20
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the technique disclosed in Patent Document 1, since the control of the cavitation flow is insufficient, there is a possibility that a thermal layer interface, which is a portion where the temperature of the fluid changes rapidly, may be formed in the above-mentioned predetermined portion of the piping.
In this way, thermal fatigue of the piping due to the thermal layer interface will occur in the above-mentioned predetermined portion, which will adversely affect the piping.

Method used

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Experimental program
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Effect test

no. 1 approach

[0067] Below, refer to figure 1 and figure 2 The branch tube of the first embodiment of the present invention will be described.

[0068] figure 1 It is a schematic diagram explaining the branch pipe structure of this embodiment.

[0069] Such as figure 1 As shown, a branch pipe (pipe) 1 is a pipe branched from a main pipe 3 through which high-temperature water flows.

[0070] The branch pipe 1 has: a first pipe (distribution mechanism) 5 connected to the main pipe 3; a second pipe (distribution mechanism) 7 separated from the first pipe 5; The pipe is the connecting pipe (distribution mechanism) 9 .

[0071] The side of the first piping 5 and the second piping 7 ( figure 1 The end portion on the lower side) forms a connecting portion 11A having a diameter larger than that of other portions. The connection pipe 9 is connected to the peripheral surface of the connection portion 11A. The second piping 7, the first piping 5 side ( figure 1 The end portion on the upper s...

no. 2 approach

[0085] Next, refer to image 3 A second embodiment of the present invention will be described.

[0086] image 3 It is a schematic diagram explaining the branch pipe structure of this embodiment.

[0087] Components that are the same as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0088] Such as image 3 As shown, the branch pipe (pipe) 51 is a pipe branched from the main pipe 3 through which high-temperature water flows.

[0089] The branch pipe 51 has: a pipe 53 connected to the main pipe 3; a first rotating blade (first screw member, obstructing mechanism) 55 and a second rotating blade (second spiral member, obstructing mechanism) 57 arranged in the pipe 53; The support portion 59 supports the first and second rotary blades 55 and 57 .

[0090] The first rotary blade 55 is a helical blade that rotates in one rotation direction (for example, a clockwise rotation direction away from the main pipe 3 ). Th...

no. 3 approach

[0099] Next, refer to Figure 4 A third embodiment of the present invention will be described.

[0100] Figure 4It is a schematic diagram explaining the branch pipe structure of this embodiment.

[0101] Components that are the same as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0102] Such as Figure 4 As shown, the branch pipe (pipe) 101 is a pipe branched from the main pipe 3 through which high-temperature water flows.

[0103] The branch pipe 101 has a pipe 103 connected to the main pipe 3 , and a labyrinth structure part (flow path blocking part, obstructing mechanism) 105 arranged in the pipe 53 .

[0104] The labyrinth structure portion 105 has a plurality of plate members 107 extending radially inward from the inner wall of the pipe 103 . The plurality of plate members 107 block a part of the flow path in the piping 103 and allow water to flow through the remaining openings 109 .

[0105] In addi...

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PUM

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Abstract

Provided is piping by which branch lines are prevented from being affected due to cavity flow. Piping (1) is branched from main piping (3) wherein a high temperature fluid is circulated and the piping (1) is permitted to be opened and shut. The piping (1) is provided with branching means (5, 7, 9) for branching the flow path in the piping (1) into a plurality of small flow paths.

Description

technical field [0001] The present invention relates to a piping through which a fluid flows, and in particular, to a closed piping branched from a main piping through which a high-temperature fluid flows. Background technique [0002] Generally, various branch pipes are connected to main pipes through which water flows in power generation equipment or other equipment. Some of the branch pipelines are only used when the equipment is started or during maintenance and inspection. When the equipment is in normal operation, the branch pipelines are closed by means of isolation valves arranged in the branch pipelines. [0003] In this way, a spiral eddy flow caused by the water flow in the main pipe, that is, a so-called cavitation flow, is formed in the branch pipe closed by the isolation valve or the like. If the heat dissipation effect of the pipe wall in the closed branch pipe acts on the cavitation flow, a thermal layer interface is formed at the front end of the cavitation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L41/02F16L55/00
CPCF16L41/021F22B37/10F22B37/106F16L9/19F22B37/125Y10T137/85938F16L41/02F16L55/00
Inventor 近藤喜之谷本浩一铃木盛喜立花浩次
Owner MITSUBISHI HEAVY IND LTD
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