JP2727723B2 - Gas-liquid two-phase fluid distributor - Google Patents

Description

The present invention relates to, for example, an evaporator constituting a refrigeration cycle,
The present invention relates to a gas-liquid two-phase fluid distributor that evenly distributes a liquid refrigerant.

[Prior Art] FIG. 4 is a vertical sectional view of this type of distributor disclosed in Japanese Patent Application Laid-Open No. 63-220054. In the figure, (1) is a distribution pipe through which a gas-liquid two-phase fluid is passed. , (2) are a plurality of flow dividing thin tubes having the same inner diameter, and (3) is provided on the inlet side in the distribution pipe (1) and is used to transfer the flowing liquid two-phase fluid (4). It is a rotating blade that stirs by the flow.

That is, the gas-liquid two-phase fluid (4) supplied into the distribution pipe (1) is agitated by the chemical impeller (3) to give a swirling component to be in a gas-liquid mixed state, and each of the distribution pipes (2) ) To flow evenly.

[Problems to be Solved by the Invention] Since the conventional gas-liquid two-phase fluid distributor is configured as described above, it is necessary to provide a rotating blade in the distribution pipe, which causes an increase in cost. I was

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to equalize the flow rate of the effluent from each capillary without using the above-mentioned rotor.

[Means for Solving the Problems] In the distributor according to the present invention, in which a plurality of diverting tubules are erected in a diverting pipe through which a gas-liquid two-phase fluid is passed, an inlet portion of each diverting tubule inside the diverting pipe. In order to make the liquid flow rate of the liquid film of the gas-liquid two-phase fluid passing through the pipe uniform, the diameter of the hole provided in the distribution pipe at the connection point between the distribution pipe and the narrow flow pipe is increased in the flow direction.

[Operation] In the gas-liquid two-phase fluid distributor according to the present invention, the diameter of the hole provided in the distribution pipe at the connection point between the distributor and the narrow pipe for the distribution gradually increases in the flow direction. The liquid flow rate of the liquid film of the gas-liquid two-phase fluid passing through the inlet of each of the branch pipes becomes uniform.

Example An example of the present invention will be described below. That is, in FIG. 1, (1) is a distribution pipe into which a gas-liquid two-phase fluid flows, (2) is a plurality of flow division thin pipes branched in a vertical line from this distribution pipe, and (1a) is a distribution pipe (1). The inner chamber, (4) is a gas-liquid two-phase fluid supplied into the distribution pipe (1), (4a)
Indicates the gas phase, (4b) indicates the liquid phase, and the solid arrow indicates the flow of the gas phase fluid.

FIG. 2 is an enlarged sectional view taken along the line II-II of FIG. 1, where D is the inside diameter of the distribution pipe (1), d is the inside diameter of the small pipe (2), and θ is the center of the distribution pipe (1) and the small pipe (2). ) Is the angle made with the inner diameter of the base.

That is, the gas-liquid two-phase fluid (4) and [gas phase (4a) + liquid phase (4b)] flowing into the distribution pipe (1) have an inner peripheral surface formed as an annular flow having a substantially uniform liquid film thickness. To rise. Therefore, the liquid film passing through the inlet of each capillary (2) flows out of each capillary (2). The flow rate of the liquid flowing out to each of the thin tubes is expressed by the following equation based on the relationship between the distribution pipe (1) and each of the thin tubes (2).

Here, G is the flow rate of the effluent from the thin tube, Gin is the flow rate of the inflow liquid, D is the inside diameter of the distribution pipe, d is the inside diameter of the thin tube, and θ is the above angle.

Therefore, when the inner diameter D of the distribution pipe is uniform and the inner diameters d of the plurality of small pipes are all the same, the flow rate of the inflow liquid decreases as the downstream narrow pipe decreases, so that the flow rate of the outflow liquid therefrom also decreases.

Therefore, in the embodiment of FIG. 1, the inner diameter of the four thin tubes is increased toward the downstream thin tube to increase θ so that the liquid-phase fluid of the gas-liquid two-phase fluid is uniformly distributed. is there.

In the above embodiment, the case where the inner diameter of each thin tube is increased toward the downstream side is described. However, as shown in another embodiment of FIG. 3, all four thin tubes (2) have the same inner diameter. However, the diameter of the outflow hole (2a) provided at the connection point between each of the thin tubes (2) and the distribution pipe (1) is increased toward the downstream side to increase θ, and the outflow from each of the thin tubes (2) is performed. The liquid flow rate may be equalized.

In the above embodiment, the distributor for dividing the gas-liquid two-phase fluid into four parts has been described, but the present invention is not limited to this. Further, in the above embodiment, the attachment interval of each thin tube is not described, but if the attachment interval of each thin tube is as large as possible at least twice the inner diameter d of the thin tube, the flow rate of the effluent can be made even more uniform. .

[Effects of the Invention] Since the gas-liquid two-phase fluid distributor according to the present invention is configured as described above, the gas-liquid two-phase fluid distribution with a uniform flow rate of the liquid film of the liquid-phase fluid flowing out of each capillary tube is performed. The effect is that the vessel can be obtained without a conventional rotor.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a gas-liquid two-phase fluid distributor of the present invention, FIG. 2 is a II-II sectional view of FIG. 1, and FIG. 3 is a vertical sectional view showing another embodiment of the present invention. FIG. 4 is a vertical sectional view of a conventional gas-liquid two-phase fluid distributor. In the drawing, (1) is a distribution pipe, (2) is a thin pipe, and (4) is a gas-liquid two-phase fluid.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tomomasa Takeshita 3-18-1 Oga, Shizuoka-shi, Shizuoka Pref. Mitsubishi Electric Corporation Shizuoka Works Showa 55-166371 (JP, U) Actually open Showa 56-117294 (JP, U)

Claims (1)

(57) [Claims] 1. A distributor in which a plurality of flow dividing thin tubes are erected in a distribution pipe through which a gas-liquid two-phase fluid is passed. The diameter of the hole provided in the distribution pipe at the connection point between the distribution pipe and the distribution capillary is increased in the gas flow direction so that the liquid flow rate of the liquid film of the fluid becomes uniform. Gas-liquid two-phase fluid distributor.