JPS6138654Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a fluid mixing device for mixing two fluids having different temperatures.

Technical background of the invention and its problems In general, in order to continuously mix two types of fluids,
A branch pipe is branched and connected to the main pipe, a first fluid is passed through the main pipe, a second fluid is flowed into the main pipe from the branch pipe, and the first fluid and the second fluid are mixed in the main pipe. A mixing device is used.

By the way, if there is a temperature difference between the first fluid and the second fluid, thermal stress will occur at the connection between the main pipe and the branch pipes, so a fluid mixing device with a structure that reduces this thermal stress is used. This is called thermal tie. And this thermal
Conventionally, various types of tie have been used as shown in FIGS. 1 to 3.

The one shown in Figure 1 is called a recombination tie, in which branch pipes are branched and connected to the main pipe 1.
An inner pipe 3 is provided within the main pipe 1 at a portion to which the branch pipe 2 is connected. There is an annular gap 3a between the outer circumferential surface of the inner tube 3 and the inner circumferential surface of the main tube.
is formed. The upstream end of the inner tube 3 is smoothly expanded in diameter and welded to the inner surface of the main pipe 3, and the upstream end of the gap 3a is open into the main pipe 1. Then, the first fluid flows through the main pipe 1 and flows through the inner pipe 3. A second fluid having a different temperature from the first fluid is supplied from the branch pipe 2 into the gap 3a, and the downstream end of the gap 3a is open into the main pipe 1. Then, the first fluid is passed through the main pipe 1 and passed through the inner pipe 3.
flows through the inside. Further, a second fluid having a different temperature from the first fluid is supplied from the branch pipe 2 into the gap 3a, and flows into the main pipe 1 from the downstream end of the gap 3a as an annular flow. This one is main pipe 1
Since the second fluid flows in the gap 3a between the branch pipe 2 and the main pipe 3, excessive thermal stress is not generated at the connection portion between the branch pipe 2 and the main pipe 1.

Furthermore, the one shown in FIG. 2 is called a Swedish type thermal tee. In this device, a branch pipe 4 is branched and connected to the main pipe 1a, a nozzle pipe 5 is provided within the end of the branch pipe 4, and an annular shape is formed between the outer peripheral surface of the nozzle pipe 5 and the inner peripheral surface of the branch pipe 4. A gap 4a is formed therein. The upstream end of this nozzle pipe 4 is smoothly expanded in diameter and welded to the inner surface of the branch pipe 4, the upstream end of this gap 4a is closed, and the downstream end is inserted into the main pipe 1a. It's open. The first fluid flows through the main pipe 1a, and the second fluid is supplied from the branch pipe 4 and flows into the main pipe 1a through the nozzle pipe 5. Mix with 1 fluid. In this case, the first fluid flowing in the main pipe 1a flows into the gap 4a at the connecting part of the branch pipe 4, so that excessive thermal stress is generated at the connecting part between the branch pipe 4 and the main pipe 1a. Never.

However, at these thermal tees, the second fluid flowing into the main pipes 1 and 1a immediately flows into the first fluid.
The fluid does not mix uniformly with the fluid, and flows in a predetermined incomplete mixing region A without being completely mixed. Moreover, in these thermal tees, the first fluid and the second fluid are mixed near the inner circumferential surfaces of the main tubes 1, 1a. Therefore, in the incomplete mixing region A, the first fluid and the second fluid having different temperatures alternately contact the inner surfaces of the main tubes 1 and 1a.
A high-cycle thermal shock is applied to 1a, and a high-cycle repetitive load due to thermal stress is applied. For this reason, cracks sometimes occurred in the main tubes 1 and 1a.

Therefore, an inner tube type thermal
Something called Tei was developed. This internal tube type thermal tee has a branch pipe 5a protruding into the main pipe 1b, the tip of the branch pipe 5a is opened near the center line of the main pipe 1b, and a temperature difference exists near the center line of the main pipe 1b. The first fluid and the second fluid are made to flow together. In this case, even in the incomplete mixing region A, the first fluid and the second fluid do not come into contact with the inner surface of the main pipe 1b alternately, and high-cycle thermal shock is not applied to the main pipe 1b.

However, in this inner tube type thermal tee, the main tube 1
Since the branch pipe 5a is provided in a protruding manner within the main pipe 1b, there is a problem in that it obstructs the flow of the first fluid within the main pipe 1b and increases flow path resistance. Further, there was a problem in that Karman vortices were generated alternately on the downstream side of the technical pipe 5a, causing the branch pipe 5a to vibrate.

Purpose of the invention The purpose of the invention is to eliminate the risk of cracks occurring due to repeated loads due to thermal stress in pipe joints that mix two fluids with different temperatures, to avoid vibration, and to reduce flow path resistance. An object of the present invention is to provide a fluid mixing device.

Summary of the invention A fluid mixing device according to the invention includes a bent main pipe through which a first fluid flows, and an outflow side end of the main pipe that extends through an outer wall portion of the main pipe in the bending direction and protrudes into the main pipe. A branch pipe is provided to direct the center of the main pipe and eject a second fluid having a different temperature from the first fluid into the main pipe. Therefore, the two fluids are mixed at the center of the outflow side of the main pipe, no repetitive load due to thermal stress is generated on the inner surface of the main pipe, and the branch pipes are Since the pipes are arranged diagonally, there is no vibration in the branch pipes.

An embodiment of the present invention will be described with reference to Fig. 4. In the figure, 6 is a main pipe, and this main pipe 6 has a bent portion 6a bent at 90 degrees, for example like an elbow. And, at this bent portion 6a, the inlet side main pipe 6
The first fluid flows through the main pipe 6 from the inlet side to the outlet side.
A branch pipe 7 is provided penetrating the outer wall of the bent portion 6a of the mother pipe 6 in the bending direction and protruding into the bent portion 6a. The branch pipe 7 is directed toward the center of the outlet end of the bent portion 6a, and is configured to mix the first fluid from the branch pipe 7 with the first fluid in the mother pipe 6. The tip of the branch pipe 7 is
The branch pipe 7 is cut obliquely along the flow direction of the fluid flowing through the pipe a.
The stay 8 is supported on the inner wall of the parent pipe 6 by a stay 8a. The stay 8 is formed elongated along the direction of fluid flow so as not to increase the flow resistance in the parent pipe 6 .

This embodiment of the present invention has the following effects.

The second fluid flowing into the main pipe 6 from the branch pipe 7 is ejected toward the outflow side end of the bent part 6a of the main pipe 6 ,
It mixes with the first fluid at the center of the bent portion 6a and the outflow side main tube 6c. Therefore, even if these 2
Even if there is a considerable temperature difference between the fluids, the two fluids with different temperatures will not come into contact with the inner wall of the main pipe 6 alternately. Therefore, high-cycle thermal shock is not applied to the inner wall of the main pipe 6 , and repeated loads due to thermal stress are not applied, so there is no risk of cracks occurring in the main pipe 6 due to fatigue.

Next, since the branch pipe 7 protrudes from the bent part 6a of the main pipe 6 toward the center of the outflow side end, it is located on the downstream side with respect to the flow direction of the first fluid flowing inside the bent part 6a. is inclined to. In other words, this branch pipe 7
is given a swept angle with respect to the first fluid flow. Therefore, no Karman vortex is generated behind the branch pipe 7. Therefore, vibration does not occur in the branch pipe 7, and flow path resistance can also be reduced.

Furthermore, since the tip of the branch pipe 7 is supported by the stay 8, vibration can be further prevented.

Note that the present invention is not limited to the above embodiment. For example, the bent portion of the main pipe 6 is not limited to being bent at 90 degrees, but may have any bending angle.

Effects of the Invention The fluid mixing device of the present invention includes a bent main pipe through which a first fluid flows, and an outflow side end of the main pipe that penetrates through the outer wall portion of the main pipe in the bending direction and protrudes into the main pipe. The tip thereof is cut obliquely along the flow direction of the fluid flowing through the bent portion of the mother pipe, and the second fluid having a temperature different from the first fluid is directed to the mother pipe. It is characterized by comprising a branch pipe that ejects water into the pipe, and a stay that has one end fixed to the inner surface of the main pipe and the other end that supports the tip of the branch pipe and is elongated along the fluid flow direction. It is something. Therefore, even if there is a considerable temperature difference between the two fluids, the two fluids with different temperatures will not come into contact with the inner wall of the main tube alternately.
Since repeated loads due to thermal stress are not applied to the inner wall of the main pipe, cracks do not occur in the main pipe. In addition, since this branch pipe protrudes into the bent main pipe toward the center on the downstream side, it has a rear diagonal with respect to the flow direction of the first fluid flowing inside this main pipe, and this branch Karman vortices are not generated on the downstream side of the pipe, vibrations of the branch pipes are prevented, flow path resistance is reduced, and other effects are great. Since the tips of the branch pipes are cut diagonally along the direction of fluid flowing through the bent part of the main pipe, it is possible to effectively mix fluid flow, and the tips of the branch pipes are supported by stays. This makes it possible to effectively prevent vibration. Furthermore, since the stay is formed to be elongated in the fluid flow direction, it is extremely effective in reducing flow path resistance.

[Brief explanation of the drawing]

Figures 1 to 3 are longitudinal sectional views showing conventional examples;
FIG. 4 is a longitudinal sectional view showing an embodiment of the present invention. 6 ... Main pipe, 6a... Bent part, 7... Branch pipe, 8
...Stay.

Claims (1)

[Scope of utility model registration request] A bent main pipe through which the first fluid flows, and a main pipe that penetrates the outer wall portion of the main pipe in the bending direction and protrudes into the main pipe, and is provided facing the center of the outflow side end of the main pipe, and the tip thereof. is cut obliquely along the flow direction of the fluid flowing through the bent portion of the main pipe, and a branch pipe that injects a second fluid having a different temperature from the first fluid into the main pipe; A fluid mixing device comprising: a stay that is fixed to the inner surface of the main pipe, supports the tip of the branch pipe at the other end, and is elongated along the fluid flow direction.