JPH03191269A - Refrigerant flow divider - Google Patents

Abstract

PURPOSE:To provide a refrigerant flow divider which makes division of a refrigerant flow uniform and to sharply retrieves limitation of a placing state by a method wherein an inflow pipe inserted and joined with the refrigerant inlet of a refrigerant flow dividing part has one end through which a refrigerant flows out and a small hole is formed in the one end. CONSTITUTION:A refrigerant C flowing through the closed circuit of a refrigeration cycle flows to an inflow pipe 15 in a state that it forms two phase flows of a liquid phase C1 and a gas phase C2, and flows in a flow dividing part 12 through a small hole 15a. In this case, the refrigerant C is followed by vaporization of a part of the liquid phase C1 due to a rapid pressure fall, and gas and liquid are mixed together to inject the mixture in a sprayform manner. Further, an injection flow is collided with the arcuate wall surface of the flow dividing part 12 and promotes mixture of two phases of sprayform gas and liquid and radially uniformly distributes the mixture. In this case, by collision of the mixture with the arcuate wall surface, a reflection flow smoothly radially flows along a wall surface as against an injection flow through the small hole 15a and prevents the increase of incurring of a pressure loss. Thereafter, the refrigerant flows through a refrigerant outlet 14 to an outflow pipe 16 to complete division of a flow.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refrigerant flow divider for uniformly dividing refrigerant in a refrigeration cycle of an air conditioner, a refrigeration equipment, or the like.

Conventional technology In recent years, refrigerant flow dividers have been used to cope with the multiplication of refrigeration systems and the creation of multiple circuits due to the increase in the shaft diameter of heat exchanger tubes.The importance of refrigerant flow dividers in refrigeration systems has increased. (For example, Japanese Patent Laid-Open No. 60-4770).

The conventional refrigerant flow divider mentioned above will be explained below with reference to the drawings.

Figure 13 shows a front external view of a conventional refrigerant flow divider;
Figure 4 shows the side view, Figure 15 shows the A-A cross-sectional view of Figure 14, and Figure 1e shows the refrigerant state inside the refrigerant divider when Figure 13 is used as an evaporator during refrigeration cycle operation. shows.

In Figures 13 to 16, 1 is a refrigerant flow divider, 2 is a hollow body flow divider with a single refrigerant population 3 at one end, and 2 at the other end.
refrigerant outlets 4.

Furthermore, an inflow pipe 6 is inserted and connected to the refrigerant outlet 3, and an outflow pipe 6 is inserted and connected to the refrigerant outlet 4.

When the refrigerant flow divider 1 configured as described above is used in an evaporator, its operation will be explained below using FIG. 16.

Refrigerant B adiabatically expanded by an expansion valve (not shown) is in the gas phase B1
The refrigerant flows through the inflow pipe 6 while being separated into a liquid phase B2, flows into the dividing section 2 via the refrigerant inlet 3, is divided at the refrigerant outlet 4, and flows out into the outflow pipe 6.

Problems to be Solved by the Invention However, in the above configuration, when the two refrigerant outlets 4a and 4b are located one above the other as shown in FIG.
Due to the influence of gravity, a gas phase B2 with a small specific gravity flows into the upper refrigerant outlet 4a, and B1 with a higher specific gravity flows into the lower refrigerant outlet 4b.
is the main flow, resulting in unequal distribution. Moreover, the refrigerant outlet 4a,
Even if 4b is installed horizontally or vertically so as not to be affected by gravity, the liquid phase B1 tends to drift to one side due to the Coanda effect. Furthermore, in order to prevent drifting due to bending of the inflow pipe 5, a certain amount of straight pipe is required up to the joint with the first branch part 2, and there are many restrictions on the installation state of the refrigerant flow divider 1 and the piping means.

The present invention solves the above-mentioned conventional problems, and provides a refrigerant flow divider in which refrigerant flow is made uniform and restrictions on installation conditions are significantly reduced.

Means for Solving the Problems In order to solve the above problems, the refrigerant flow divider of the present invention has one end in an arc shape and the other end having a refrigerant inlet in the center, and a plurality of refrigerant outlets at the same end as the refrigerant inlet. The inflow pipe inserted and connected to the refrigerant inlet of the refrigerant division part is provided with a small hole at one end through which the refrigerant flows out, and the arcuate end of the refrigerant division part is further provided with a small hole. The tip of the inner diameter is arc-shaped,
The radius of curvature is such that a convex portion is provided with the small hole as the center.

According to the above-described structure, the refrigerant that is separated into gas and liquid flowing through the inflow pipe is mixed in a spray form and ejected when passing through the small holes of the inflow pipe, and collides with the arcuate inner wall surface of the convex part of the flow dividing part. This agitation promotes mixing of the two-phase gas-liquid flow in the form of a spray. At this time, even if the liquid refrigerant tries to flow more to one side due to the influence of significant drift, it will collide with the arc-shaped convex wall surface, and the reflected flow will flow symmetrically to both sides relative to the jet flow from the small hole, and then, The refrigerant spreads smoothly along the arc-shaped peripheral wall and is evenly divided by multiple refrigerant outlets.

EXAMPLE A refrigerant flow divider according to a first example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a front external view of a refrigerant flow divider in an embodiment of the present invention, FIG. 2 shows a side view thereof, FIG. 3 shows a sectional view taken along the line ■-■ in FIG. 2, and FIG. Heat exchanger (not shown)
FIG. 2 is a sectional view showing the refrigerant state inside the refrigerant flow divider attached to the refrigerant when the refrigerant is used as an evaporator during operation of a refrigeration cycle.

In FIGS. 1 to 6, 11 is a refrigerant flow divider, 12 is a flow divider portion of a hollow body having an arcuate shape at one end, and the refrigerant population 1 at the other end.
3 and two refrigerant outlets 14. Furthermore, an inflow pipe 15 having a small hole 15a at one end through which the refrigerant flows out is inserted into the refrigerant port 13, and an outflow pipe 16 is inserted into the refrigerant outlet 14.

Regarding the refrigerant flow divider configured as above, the following is the fourth section.
The operation will be explained using diagrams.

The refrigerant C flowing through the closed circuit of the refrigeration cycle becomes a two-phase flow of liquid phase C1 and gas phase C2, flows through the inlet pipe 16, and enters the small hole 15.
It flows into the dividing section 12 via a.

At this time, due to the rapid pressure drop in the refrigerant C, some liquid phase C
1 is evaporated, and the gas and liquid are mixed and ejected in the form of a spray. Further, the ejected flow collides with the arcuate wall surface of the flow dividing section 12, promoting mixing of the two-phase gas-liquid flow in the form of spray and evenly distributing it radially. At this time, the reflected flow due to the collision with the arcuate wall surface smoothly flows radially along the wall surface with respect to the jet flow from the small hole 15a, and does not increase pressure loss. Thereafter, the refrigerant flows out from the refrigerant outlet 14 to the outflow pipe 16, completing the separation.

As described above, according to this embodiment, the flat hollow body has an arc shape at one end, a refrigerant inlet at the center of the other end, and a plurality of refrigerant outlets adjacent to it. The inflow pipe is provided with an inflow pipe and an outflow pipe inserted and connected to the refrigerant outlet of the dividing section, and the inflow pipe has a small hole at one end from which the refrigerant flows out.A simple structure allows for equal flow division, and the inflow pipe and outflow pipe are Since the outflow pipes are on the same plane and in the same direction, there are few restrictions on how they can be installed, and they can be appropriately installed as part of the piping within the heat exchanger.

In this embodiment, another arcuate protrusion was provided as a protrusion at the arcuate end, but if the arcuate end is an arc having a radius of curvature centered on the small hole of the inflow pipe, the protrusion There is no need to set it.

A refrigerant flow divider according to a second embodiment of the present invention will be described below with reference to the drawings.

Fig. 6 shows a front external view of the refrigerant flow divider in the embodiment of the present invention, Fig. 6 shows its side view, Fig. 7 shows a sectional view taken along FIG. 3 is a cross-sectional view showing the state of refrigerant inside a refrigerant flow divider attached to the exchanger when the exchanger is used as an evaporator during operation of a refrigeration cycle.

In FIGS. 6 to 8, 21 is a refrigerant flow divider, 22 is a flow divider portion of a hollow body having an arcuate shape at one end, and a refrigerant population 23 at the other end.
and two refrigerant outlets 24. Further, an inflow pipe 26 having a small hole 25a at one end through which the refrigerant flows out is inserted into the refrigerant inlet 23, and an outflow pipe 26 is inserted into the refrigerant outlet 24.

The above configuration is similar to that of the first embodiment.

The configuration differs from that of the first embodiment in that the arc-shaped end portion of the flow dividing portion 12 is provided with an arc-shaped convex portion 22a whose inner surface has a radius of curvature centered on the small hole 25a. .

Regarding the refrigerant flow divider configured as above, the sixth section will be described below.
The operation will be explained using diagrams.

The refrigerant flowing through the closed circuit of the refrigeration cycle flows through the inflow pipe 16 as a two-phase flow of liquid phase D1 and gas phase D2, and flows through the small hole 25.
It flows into the dividing section 22 via a.

At this time, due to the rapid pressure drop in the refrigerant tank, part of the liquid phase D1 evaporates, and gas and liquid are mixed and ejected in the form of a spray. Further, the ejected flow collides with the arcuate convex portion 12a, promoting mixing of the two-phase gas-liquid flow in the form of spray, and evenly distributing it radially.

At this time, the reflected flow that collides with the arc-shaped convex portion tries to head toward the small hole 15a, but since the force of the jet flow is stronger, it flows symmetrically to both sides of the jet flow, causing a significant deviation in the jet flow. Even if there is, an equal distribution will be made. Thereafter, the refrigerant C smoothly spreads 9 radially along the arc-shaped peripheral wall of the dividing portion 22, and flows out from the refrigerant outlet 14 into the outflow pipe 16, completing the dividing.

As described above, according to the second embodiment of the present invention, the simple structure in which the arc-shaped end portion of the flow dividing portion is provided with an arc-shaped convex portion centered on the small hole allows more even flow to be divided. It can be done.

A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 9 is a front external view of a refrigerant flow divider according to the third embodiment of the present invention, FIG. 10 is a side view thereof, FIG. 11 is a sectional view taken along the line ■-■ in FIG. 10, and FIG. FIG. 2 is a sectional view showing the refrigerant state inside the refrigerant flow divider attached to the heat exchanger when the heat exchanger is used as an evaporator during operation of the refrigeration cycle. 9 to 12, 31 is a refrigerant flow divider;
5 is an inflow pipe provided with a small hole 35a, and 36 is an outflow pipe, one or more of which is the same as the structure of the second embodiment. The difference from the configuration of the second embodiment is that the inner surface has an arc-shaped convex portion 32a having a radius of curvature centered on the small hole 35a, and a refrigerant inlet 33 in the center. The point is that the flow dividing section 32 of the hollow body having the refrigerant outlet 34 at the end is made into a curved pipe.

The operation of the refrigerant flow divider configured as described above will be described below.

Similar to the second embodiment, the refrigerant E has a liquid phase E1 and a gas phase E2.
It flows through the inflow pipe 36 as a two-phase flow, passes through the small hole 35a, and is ejected in the form of a spray, mixing gas and liquid.
The arc-shaped convex portion 32a collides with the refrigerant to promote mixing of the gas-liquid two-phase flow and to distribute it evenly, and smoothly reaches the refrigerant outlet 34 along the circumferential wall of the five-bent pipe, flows out into the outflow pipe 36, and is divided into streams. Complete.

As described above, according to this embodiment, since the dividing section is made of a curved pipe, the internal volume of the dividing section is small, and the evenly distributed refrigerant does not rejoin due to collision, so the dividing section There is no formation of liquid or air pockets inside, and the refrigerant can be divided more evenly.

Effects of the Invention As described above, the refrigerant flow divider of the present invention is a hollow body flow divider having an arcuate end at one end, a refrigerant inlet at the center of the other end, and a plurality of refrigerant outlets at the same end as the refrigerant inlet. The inflow pipe is inserted and connected to the refrigerant inlet of the dividing section, and a small hole is provided at one end from which the refrigerant flows out of the inflow pipe, so that even distribution of the flow can be performed, and the arc-shaped end of the dividing section In addition, by providing an arcuate convex portion whose inner surface is centered on the small hole, even if the flow is ejected from the small hole due to significant drift, even flow can be divided. Furthermore, because of its simple configuration, it is possible to provide an inexpensive and compact refrigerant flow divider, and since the refrigerant inlet and refrigerant outlet are on the same plane and in the same direction, it can easily be used as part of piping in a heat exchanger. It can be used for multiple circuits of complex heat exchangers.

[Brief explanation of drawings]

Fig. 1 is a front external view of a refrigerant flow divider according to the first embodiment of the present invention, Fig. 2 is a side view of the refrigerant flow divider, Fig. 3 is a sectional view taken along the line ■-■ of Fig. 2, and Fig. 4 is a cross-sectional view showing the state of the refrigerant when the refrigerant flow divider in FIG. 1 is in use; FIG. 6 is a front external view of the refrigerant flow divider according to the second embodiment of the present invention; FIG. 7 is a sectional view taken along the line m-■ in FIG. 10 is a side view of the refrigerant flow divider in Example 3, FIG. 11 is a cross-sectional view taken along the line IV in FIG.
Figure 2 is a sectional view showing the state of refrigerant in the refrigerant flow divider in use in Figure 9, Figure 13 is a front external view of a conventional refrigerant flow divider, Figure 14 is a side view thereof, and Figure 16 is a A-A in Figure 13
16 is a sectional view showing the state of the refrigerant when the refrigerant flow divider of FIG. 13 is in use. 11.21.31...Refrigerant flow divider, 12,22
゜32...Diversion part, 15, 25.35...
...Inflow pipe, 15a, 25a, 35a-=-small hole,
22a, 32a... Arc-shaped convex portions.

Claims (2)

[Claims] (1) A branching section having one end in an arc shape and a refrigerant inlet at the center of the other end, and a plurality of refrigerant outlets at the same end as the refrigerant inlet, and an inflow pipe inserted and joined to the refrigerant inlet of the dividing section. and,
an outflow pipe connected to the refrigerant outlet of the dividing section,
The refrigerant flow divider is configured such that the inflow pipe is provided with a small hole at one end through which the refrigerant flows out. (2) A patent characterized in that the arc-shaped end of the flow dividing section is configured with an arc-shaped convex portion at the tip, and the inner surface of this arc has a radius of curvature centered on the small hole of the inflow pipe. A refrigerant flow divider according to claim 1.