JPH0221737Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a gas-liquid two-phase flow distributor.

For example, at the refrigerant evaporator inlet of an air conditioner, the refrigerant flow is divided into two phases: gas and liquid. If there is a lot of gas, the evaporation is not completed and liquid remains and comes out of the evaporator, whereas if there is a lot of gas, it quickly evaporates and becomes superheated gas, and the heat exchange from then on is not sufficient. If this is not done, the evaporator will be used extremely uneconomically as a whole, so the quality of gas-liquid distribution is extremely important, and many distributors have been developed.

For example, there are systems that separate gas and liquid and distribute each in a single-phase flow, but the structure is complex and the separation equipment is large, making it impractical, or simply arranging each branch pipe symmetrically with respect to the inlet pipe axis. There is also a simple system that is simply placed in the inlet pipe, but this does not provide good distribution because the liquid is distributed unevenly with respect to the inlet pipe axis due to secondary flow due to pipe bending on the upstream side of the branch pipe.

The present invention was proposed in view of these circumstances, and aims to provide a gas-liquid two-phase flow distributor with good distribution performance and a simple structure. In a gas-liquid two-phase flow distributor in which a plurality of branch pipes are arranged axially symmetrically at the outlet end, the distributor flow path upstream of the branch pipes is divided into approximately equal parts and twisted in the axial direction. The system is equipped with multiple swirling vanes that apply swirling force to the flow, and both swirling vanes are arranged at different angles so that the interval between the blades at the outlet of the upstream swirling vane is almost equally divided by the interval between the blades at the inlet of the downstream swirling vane. It is characterized by

An embodiment of the present invention will be explained with reference to the drawings.
Figure 1 is a longitudinal cross-sectional view, and Figure 2 is the − of Figure 1.
FIG. 3 is an enlarged perspective view showing the swirl vane in FIG. 1, FIGS. 4 and 5 are enlarged cross-sectional views along - and - in FIG. 1, respectively, and FIG. and FIG. 7 are cross-sectional views showing a modification of FIG. 2, respectively.

In the above figure, 1 is a distributor, 2a and 2b are branch pipes arranged symmetrically with respect to the central axis of the distributor 1, 3 is a brazing material, 4 is an inlet pipe, 4a is a bent part of the inlet pipe, and 5a , 5b indicate swirling vanes twisted at approximately 90 degrees, and these members are connected and fixed with brazing material 3 to prevent leakage to the outside, as shown in Fig. 1. .

In such a structure, the outlet end 5a-1 of the swirling vane 5a on the inlet pipe side is shifted by 45 degrees so as to equally divide each passage of the inlet end 5b-1 of the succeeding swirling vane 5b. Although it will be shifted by the angle of 180° ÷ the number of blades, the outlet end 5a-1 and the inlet end 5
Depending on the size of the gap b-1, the deviation angle of the blade may be changed from now on by taking into consideration the self-turning portion in the gap.

Such a distributor operates as follows.

(1) The gas-liquid two-phase flow flows in the order of the inlet pipe 4, the distributor 1, and the branch pipes 2a and 2b as shown by the arrows.

(2) Due to the presence of the inlet pipe bend 4a, a secondary flow 6 is generated in the inlet pipe 4 as shown by the arrow in FIG. 5, and this secondary flow 6 creates an annular flow with a relatively small liquid volume. In the case of , lump 6a of liquid 6
The liquid tends to be concentrated on one side as shown in the figure.

(3) Divided into four passages by the swirl vane 5a,
The fluid starts to swirl as the blades twist, and this centrifugal force forces the liquid against the tube wall surface, and the liquid mass 6a tends to be evened out, but the tendency of the difference in liquid volume between each passage remains. , not completely homogenized.

(4) Then, by entering the swirl vane 5b, the passages diverge again, so the difference between the passages described above is greatly reduced.

(5) If there are more swirling vanes, it will be completely uniform, but even with just two, it will be almost better.

(6) The fluid is distributed to the branch pipes 2a and 2b in a state where the liquid is uniformly distributed on the wall side due to the rotation.Since the branch pipes are symmetrical with respect to the axis of the distributor 1, the fluid is uniformly distributed. It is done.

As shown in Figures 6 and 7, there are 3 branch pipes.
It is possible to use any number of blades, such as four or four, but it is important that they are arranged symmetrically with respect to the axis of the distributor 1, and it is also possible to use two, three, six, etc., in addition to four swirling blades. can.

According to such a structure, the following effects can be achieved.

(1) It becomes a high-performance distributor in which the liquid is divided into branch pipes all at once.

(2) The structure is simple and compact because the swirl vanes are simply inserted into the distributor.

(3) The distributor is inexpensive because the outer tube is made by processing a single tube, such as a steel tube.

In short, according to the present invention, in a gas-liquid two-phase flow distributor in which a gas-liquid two-phase inlet pipe is connected to the inlet end and a plurality of branch pipes are arranged axially symmetrically at the outlet end, the branch pipe The upstream distributor flow path is divided into approximately equal parts, and a plurality of swirling vanes are twisted in the axial direction to give a swirling force to the flow. By arranging both swirl vanes at different angles so as to divide them almost equally, a gas-liquid two-phase flow distribution pipe with high performance, simple structure, and low cost is obtained, so the present invention is extremely useful industrially. .

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a transverse sectional view taken along - in Fig. 1, Fig. 3 is an enlarged perspective view showing the swirl vane in Fig. 1, and Fig. 4 is a longitudinal sectional view showing an embodiment of the present invention. Figures and Figures 5 are - and - of Figure 1, respectively.
FIGS. 6 and 7 are respectively cross-sectional views of a modified example shown in FIG. 2. 1, 1', 1''...distributor, 2a, 2b...branch pipe, 3...brazing material, 4...inlet pipe, 5a, 5b...
...Swivel vane, 5a-1...Exit end, 5b-1...
Inlet end, 6... Secondary flow, 6a... Mass.

Claims (1)

[Scope of utility model registration request] In a gas-liquid two-phase flow distributor in which a gas-liquid two-phase inlet pipe is connected to the inlet end and a plurality of branch pipes are arranged axially symmetrically at the outlet end, the distributor flow path upstream of the branch pipe is It is equipped with a plurality of swirling vanes that are divided into approximately equal parts and twisted in the axial direction to give a swirling force to the flow, and the angle is such that the interval between the blades at the outlet of the upstream swirling vane is approximately equally divided by the interval between the blades at the inlet of the downstream swirling vane. A gas-liquid two-phase flow distributor characterized in that both swirling vanes are arranged with offset positions.