JPH05215487A - Slewing counterflow type heat-exchanger - Google Patents

Abstract

PURPOSE:To improve a heat exchanging efficiency by increasing a length of a second fluid route in a second passage, positively expediting mixture of the fluid to enhance a heat transfer rate of the fluid and to reduce in size a heat exchanger by shortening a length of the passage. CONSTITUTION:A first passage group 1 for fluidizing first fluid A in a direction of an arrow X1 is disposed in a second passage 2 for fluidizing second fluid B in a direction of an arrow X2. A central tube 3 for branching the fluid B is disposed at a center of the group 1. The fluid B is-injected from a plurality of injection holes 3a formed at a central tube 3 and fed down while sleawing the fluid B in the passage 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swirling counterflow type heat exchanger which can be used as a heat exchanger in a pump discharge pipe.

[0002]

2. Description of the Related Art In a counterflow heat exchanger, for example, as shown in FIG. 5, a first fluid A flows in a direction of an arrow X1.
The second fluid B flowing through the passage group 1 in the direction of the arrow X2
The first fluid A and the second fluid B are arranged in the passage 2 through the peripheral walls of a plurality of tubes forming the first passage 1 group.
Are configured to exchange heat. However, in the conventional counterflow heat exchanger, the second fluid B is made to flow linearly along the axial direction of the second passage 2, so that the length of the second passage 2 is It becomes long corresponding to the path length of the second fluid required for replacement. Moreover, in the state where the second fluid B is linearly flowing, the main flow layer of the second fluid B having a large flow velocity flowing in the region away from the peripheral wall of the first passage group 1 and the first passage group 1 The mixing of the second fluid B having a low flow velocity near the peripheral wall with the boundary layer is not positively performed. Therefore, it can be said that the heat transfer coefficient of the second fluid B is low and the heat exchange efficiency is poor, and this is one of the causes for increasing the length of the second passage 2. That is, the conventional counterflow heat exchanger has a drawback that it becomes large in size due to the above-mentioned reason.

[0003]

The problem to be solved is that since the second fluid is made to flow linearly along the axial direction of the second passage, the counterflow heat exchanger becomes large in size. That is the point.

[0004]

According to the present invention, a first passage group for passing a first fluid is arranged in a second passage for passing a second fluid, and the first fluid and the second fluid are opposed to each other. In the counter-flow heat exchanger set to the flow that is set to flow, the second fluid is configured to flow while swirling in the second passage, and the path of the second fluid in the second passage is characterized. In addition to increasing the length, positively promoting the mixing of the second fluid to increase the heat transfer coefficient and improve the heat exchange efficiency, thereby shortening the length of the second passage and reducing the size of the heat exchanger. Achieved the purpose of.

[0005]

According to the present invention, since the second fluid swirls in the second passage, the ratio of the passage length of the second fluid to the length of the second passage can be increased to increase the passage length. On the other hand, the swirling of the second fluid positively promotes the mixing of the second fluid itself, thereby increasing the heat transfer coefficient and improving the heat exchange efficiency.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG.
FIG. 2 is a sectional view taken along the line A-A in FIG. Note that the same or corresponding portions as those of the conventional example shown in FIG. 1 and 2, the counterflow heat exchanger is configured by a first passage group 1 for flowing a first fluid A in the direction of arrow X1 and a second passage 2 for flowing a second fluid B in the direction of arrow X2. The first passage group 1 is composed of a plurality of tubes and is arranged inside the second passage 2 along the axial direction. Therefore, the first fluid A and the second fluid B are heat-exchanged with each other through the peripheral walls of the plurality of tubes forming the first passage group 1. A central tube 3 is arranged on the axis of the second passage 2. In the central tube 3, the second fluid B is indicated by the arrow X.
It is divided into two directions. On the other hand, as shown in FIG. 3, the central wall of the central tube 3 is provided with a predetermined interval in the axial direction.
A plurality of ejection holes 3a parallel to the tangent line S are formed at equal intervals in the circumferential direction.

With such a configuration, the second fluid B flowing in the second passage 2 in the direction of the arrow X2 is directed to the central tube 3
The second fluid B ejected from the plurality of ejection holes 3a formed in the above is converted into a swirling flow indicated by an arrow R in FIG.
Therefore, the ratio of the path length of the second fluid B to the length of the second passage 2 can be increased to increase the path length. On the other hand, the swirling of the second fluid B positively promotes the mixing of the second fluid B itself. Therefore, the heat transfer coefficient of the second fluid B is increased, the heat exchange efficiency with the first fluid A is improved, and the heat exchange efficiency can be increased. As a result, the length of the second passage 2 can be shortened to reduce the size of the heat exchanger.

FIG. 4 is a vertical sectional view showing another embodiment of the present invention. In this embodiment, the second passage 2 is provided with an inlet 2A for introducing a part of the second fluid B from the tangential direction thereof.

With such a structure, the second fluid B introduced from the inlet 2A is allowed to flow in the second passage 2 by the arrow R.
Flows while swirling as shown in. Therefore, as in the first embodiment, the ratio of the path length of the second fluid B to the length of the second passage 2 can be increased to increase the path length, and the second fluid B By swirling, mixing of the second fluid B itself is actively promoted,
The heat transfer coefficient of the fluid B is increased, the heat exchange efficiency with the first fluid A is improved, and the heat exchange efficiency can be increased.
As a result, the length of the second passage 2 can be shortened to reduce the size of the heat exchanger.

In the above embodiment, the first passage 1 and the second passage 2 having a circular cross section are used. However, the first passage 1 and the second passage 2 having a polygonal cross section are used. Good.

[0011]

As described above, according to the present invention, by swirling the second fluid in the second passage, the second fluid is generated.
The path length of the second fluid can be increased by increasing the ratio of the path length of the second fluid to the path length, and the mixing of the second fluid itself is positively promoted to increase the heat transfer coefficient and improve the heat exchange efficiency. Therefore, the length of the second passage can be shortened, and the heat exchanger can be downsized.

[Brief description of drawings]

FIG. 1 is a vertical sectional view partially showing an embodiment of the present invention.

FIG. 2 is a vertical view taken along the line A-A of FIG.

FIG. 3 is an enlarged sectional view of a main part.

FIG. 4 is a vertical sectional view showing another embodiment of the present invention.

FIG. 5 is a vertical view partially showing a conventional heat exchanger.

[Explanation of symbols]

 1 1st passage 2 2nd passage A 1st fluid B 2nd fluid R Swirling flow

Claims (1)

[Claims] 1. A counterflow type in which a first passage group through which a first fluid passes is arranged in a second passage through which a second fluid passes, and the first fluid and the second fluid are set to flow opposite to each other. In the heat exchanger, the swirling counterflow type heat exchanger is characterized in that the second fluid is swirled while flowing in the second passage.