JPS6133349Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recombination city, that is, a two-fluid mixing device installed in the middle of a pipe in order to merge fluids with different temperatures into the fluid in the pipe.

In recent years, this type of recombination city has been equipped with a fluid introduction nozzle b in the pipe a toward the flow direction of the fluid in the pipe, as shown in FIG. inside,
A structure in which high-temperature fluid is introduced through an introduction nozzle b and merged has been studied.

However, in these recombination cities, for example, when high-temperature fluid flows out from the outlet of fluid introduction nozzle b located at the center of pipe a and mixes with low-temperature fluid in pipe a, transitions with large temperature fluctuations occur. In order to reach the tube wall in transition area a, there was a defect in the portion of the colliding tube wall in the transition area that caused thermal fatigue.

The present invention was developed in an attempt to alleviate the occurrence of thermal fatigue in such tube walls.

Embodiments of the present invention will be described below based on the drawings.

Figure 2 shows the recombination city of the present invention, in which a fluid introduction nozzle 2 installed in a pipe 1
The outlet portion of the nozzle is enlarged in a concave shape within the pipe 1, and the enlarged nozzle outlet end and the inner wall of the pipe 1 form a constricted portion 3 for the fluid within the pipe 1 as shown in FIG. The fluid passes through the constriction part 3 and forms a film-like high-speed fluid layer 4 along the inner wall of the pipe.

With the above configuration, if the high temperature fluid A is now introduced through the fluid introduction nozzle 2 and merged with the low temperature fluid B in the pipe 1, the fluid introduction nozzle 2
At the rear of the outlet, high temperature fluid A and low temperature fluid B are mixed. At this time, the low-temperature fluid B located upstream of the fluid introduction nozzle 2 passes through the constriction part 3 formed by the enlargement of the nozzle 2 outlet, creating a film-like high-speed fluid layer 4 along the inner wall of the pipe. Therefore, the high-temperature fluid A flowing out from the fluid introduction nozzle 2 is passed through the center of the piping rather than the high-speed fluid layer 4 formed by the low-temperature fluid B, and at this time, the high-temperature fluid A
The mixing region of the high-speed fluid B and the low-temperature fluid B, that is, the transition region of turbulent flow accompanied by temperature fluctuations is a region 5 inside the high-speed fluid layer 4. This creates a film-like layer 4 of the low-temperature fluid B.
The tube wall covered with this material experiences small temperature fluctuations despite the merging of high-temperature fluids, and can significantly reduce thermal fatigue of the tube wall.

As described above, according to the recombination city of the present invention, it is possible to alleviate the thermal fatigue of the pipe wall of the pipe that occurs when fluids having different temperatures are combined, and it is possible to extend the life of the pipe.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a recombination city that has been proposed in recent years, FIG. 2 is a schematic sectional view of the recombination city of the present invention, and FIG. 3 is an enlarged view of the portion shown in FIG. 2. 1... Piping, 2... Fluid introduction nozzle, 3... Throttle part.

Claims (1)

[Scope of utility model registration request] In order to merge fluids with different temperatures into the fluid in the pipe, the outlet of a fluid introduction nozzle installed in the pipe is enlarged, and a constricted part for the fluid in the pipe is formed between the enlarged nozzle outlet and the inner wall of the pipe. Recombination Tee is characterized by the following.