JPH02166366A - Refrigerant flow diverter - Google Patents

Abstract

PURPOSE:To separate a refrigerant flow on an equal basis by changing a jet current discharged from a nozzle formed in a discharge port of an inflow pipe in a direction at a right angle with a collision wall, separating said refrigerant flow into a plurality of discharge pipes in a radiation manner around the wall surface, and specifying the principal dimensions. CONSTITUTION:A refrigerant flows into a shunt device 13 from an in-flow port 14 in two phase flow, such as air phase and liquid phase, and flows out from a discharge nozzle 15. The two phase flow is subjected to reduction and acceleration by a nozzle action, and it is agitated and mixed by a collision wall 17 so that the flow may be equalized. The refrigerant is radially discharged into an in-flow port 19 of a discharge pipe 21 surrounded by a peripheral wall 18 and separated. Since neither air drain nor liquid drain is formed within a cubic volume surrounded by the collision wall 17 and the peripheral wall 18, the refrigerant maintains its mixed air and liquid phase status, the refrigerant flow is equally separated, and flows out into a refrigerant pipe 22. When the inflow pipe is specified as D1, the peripheral inner size D2 and the nozzle side L1, the distance of the collision wall from the nozzle section L2, the following results will be available: L1/D1<2.0, L1/D1<0.567, and L2<30mm.

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.

2. Description of the Related Art 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 reduction in diameter of heat exchanger tubes in heat exchangers, and their importance is increasing.

Among the refrigerant flow dividers, copper molded products are often used because they are compact, low cost, and easy to manufacture and install.

Hereinafter, the conventional flow divider mentioned above will be explained with reference to the drawings.

Figures 7 to 8 show the shape of a conventional flow divider, and Figure 9 shows how the flow divider is attached to a heat exchanger.
Figure 0 shows the refrigerant state inside the flow divider when the heat exchanger is operated in a refrigeration cycle. In FIGS. 7 to 10, 1 is a flow divider, and an inflow pipe 4 has an inlet 2 and an outlet 3 at the other end.
and a conical side 5 and a cylinder J]1ii16 following it, and furthermore, an inflow lower and a plurality of outflow pipes 9 each having an outflow port 8 at the other end. 10 is a refrigerant branch.

Reference numeral 11 denotes a heat exchanger that constitutes a refrigerant circuit using refrigerant pipes 12, and a flow divider 1 is attached to the side of the heat exchanger 11 to form a plurality of refrigerant circuits.

The operation of the flow divider configured as described above will be described below with reference to FIGS. 9 and 10.

When the refrigerant A flowing through the refrigeration cycle flows into the heat exchanger 11 , it flows into the flow divider 1 located upstream of the refrigerant A, and is divided into a plurality of refrigerant circuits formed by refrigerant pipes 12 . Flow divider 1
The refrigerant A flows into the inflow port 2 as a two-phase flow of a gas phase A1 and a liquid phase A2, and after passing through the inflow pipe 4, the refrigerant A flows into the circular female side 5,
A plurality of outflow pipes 9a, 9b pass through the cylindrical body 6 and at the branch part 10.
refrigerant pipe 1 through outlet ports 8a and 8b, respectively.
It will flow out to 2a and 12b. At this time, a part of the refrigerant A is not smoothly flowed out from the outflow pipes 9a and 9b,
A part of the liquid phase A2 collides with the upper wall surface of the cylindrical body 6, falls, and stays and circulates on the conical side 5 or the lower part of the cylindrical body 6 to form a liquid pool. Similarly, a part of the gas phase A1 stays and circulates in the upper part of the cylindrical body 6 to form an air pocket.

Problems to be Solved by the Invention However, in the above configuration, the refrigerant A flows through the flow divider 1.
When flowing through the inflow pipe 4, the gas-liquid ratio is non-uniform in its cross section and the gas-liquid is separated, and this state continues even while passing through the circular female side 52 and the cylindrical body 6. Furthermore, the liquid surface of the liquid pool is disturbed by the inflowing two-phase flow, and the amount of liquid phase entrained from the liquid surface also becomes non-uniform. Furthermore, when the flow divider 1 is installed tilted with respect to the vertical direction, a large amount of the liquid phase A2 retained in the flow divider flows into the outflow pipe 9 in the vertical lower part. Therefore, at the branch part 10, the outflow pipes 9a, 9b and the refrigerant pipes 12a, 12 following them are
There was a problem in that the weight of the refrigerant A could not be evenly distributed to the refrigerant A.

In view of the above problems, the present invention provides a flow divider that can evenly divide the flow of refrigerant.

Means for Solving the Problems In order to solve the above problems, the flow divider of the present invention has a nozzle shape at the outflow part of the inflow pipe, and a collision wall that receives the jet flow from the nozzle and changes the flow in a perpendicular direction. and an outflow pipe is radially joined to a peripheral wall formed around the outflow pipe.

Effect of the present invention With the above-described configuration, the flow of the gas-liquid separated refrigerant flowing through the inflow pipe is ejected from the nozzle at the inflow pipe outlet.
This flow collides with the opposing collision wall surface, and the jetting effect by the nozzle, the collision on the collision wall surface, and the disturbance effect advance gas-liquid mixing, promoting homogenization of the gas-liquid two-phase flow, and the outflow arranged in the radial direction. By allowing the refrigerant to flow smoothly into the pipes, the refrigerant is evenly distributed to each pipe. At this time, by reducing the volume surrounded by the collision wall and the peripheral wall, the formation of liquid pools and air pools can be eliminated, and the flow can be divided evenly without reducing the effect of the jet flow.

EMBODIMENTS Below, flow dividers according to embodiments of the present invention will be described with reference to the drawings.

1 to 2 show the shape of a flow divider in an embodiment of the present invention, and FIG. 3 shows the state of refrigerant inside the flow divider when the heat exchanger is operated in a refrigeration cycle. Figures 1 to 3
In the figure, 13 is a flow divider, which includes an inlet pipe 16 having an inlet 14 and a nozzle outlet 15 at the other end, a collision wall 17 that receives the jet from the nozzle, and a peripheral wall 18 surrounding it.
Furthermore, a plurality of outflow pipes 21 each having an inlet 19 and an outlet 20 at the other end are attached radially to the central axis of the flow divider 1. 22 is a refrigerant pipe, which is the same as the conventional example,
It is connected to the outlet 20. Dl is the inlet pipe diameter, D2 is the inner diameter of the peripheral wall, Ll is the nozzle diameter, and L2 is the distance from the nozzle to the collision wall.

FIGS. 4 to 6 show the ratio of flow divided to each outflow pipe when the method of each component of the flow divider is changed (in this example, there are 3 branches). The shaded range in the figure indicates the allowable range in actual use without deteriorating the performance of the heat exchanger.

The operation of the flow divider configured as described above will be explained below using FIG. 3.

Refrigerant B flowing through the closed circuit of the refrigeration cycle becomes a two-phase flow of gas phase B1 and liquid phase B2 and flows into the flow divider 13 from the inlet 14. After passing through the inflow pipe 16, it flows out from the nozzle outlet 15. At this time, the two-phase flow is converted into a contracted flow due to the nozzle action.
It is accelerated and flows out as a jet. Thereafter, the jet of refrigerant B collides with the top collision wall 17 and is stirred and mixed. Due to this collision, stirring, and mixing action, the mixed state of the gas-liquid two-phase flow of the refrigerant B is made uniform. The homogenized refrigerant B spreads radially along the top collision wall 17 and flows into the outflow pipe 2 attached to the peripheral wall 18.
It flows out to the inlet 19 of No. 1 and is divided.

At this time, since no liquid pool or air pool is formed in the volume surrounded by the collision wall 17 and the peripheral wall 18, the gas-liquid mixing state of the refrigerant B remains uniform due to the effect of the nozzle. Therefore, the water will be divided equally. The refrigerant B evenly distributed to the outflow pipes 21 flows through each outflow pipe 21.
The refrigerant flows out from the outlet 20 into the refrigerant pipe 22.

As described above, according to this embodiment, the inflow pipe 16 is provided with the nozzle outlet 15, and the volume surrounded by the collision wall 17 and the peripheral wall 18 that receives the outflow jet is made small to prevent the formation of liquid pools and air pools. By doing so, the mixed state of the gas-liquid two-phase flow of the refrigerant B that has flowed into the flow divider 13 can be made uniform and maintained, and the refrigerant is evenly divided into each outflow pipe 21 and the refrigerant pipe 22 that follows it. can be approached. At this time, the effect can be maintained by limiting the dimensions of each part to the range shown in the second claim, as shown in FIGS. 4 to 6.

Effects of the Invention As described above, the present invention includes an inflow pipe with a nozzle outlet and a collision wall that changes the flow of the outflow jet in the vertical direction, and furthermore, the peripheral wall is provided with a wall to prevent the formation of liquid pools and air pools. By reducing the enclosed volume, even distribution of the refrigerant can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the general shape of a flow divider in an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 8 shows the flow of refrigerant when the flow divider of FIG. 1 is in use. 4 is a graph showing the relationship between the nozzle diameter/inflow pipe diameter and the splitting ratio. Fig. 5 is a graph showing the relationship between the inner diameter of the peripheral wall/inflow pipe diameter and the splitting ratio. Figure 7 is a perspective view showing the schematic shape of a conventional flow divider, Figure 8 is a cross-sectional view of Figure 7, and Figure 9 shows the heat distribution of the flow divider in Figure 7. FIG. 10 is a perspective view showing the state of attachment to the exchanger, and FIG. 10 is a cross-sectional view showing the flow of refrigerant when the flow divider of FIG. 7 is in use. 13... Flow divider, 15... Nozzle outlet, 16...
・Inflow pipe, 17... Collision wall, 18... Peripheral wall, 21.
...Outflow pipe. Name of agent: Patent attorney Shigetaka Awano Haka 1 person No. 25! I 7--118-. 1-m- 9th flow Nozzle outflow flow λW 9! Circummedullary i officer port 3.0 D2/DI Squeezing umbrella (Ll/DI) (rr=m) Figure 0 ◇ 〈〉 〈〉

Claims (2)

[Claims] 1. A refrigerant consisting of a nozzle formed at the outlet of an inflow pipe, a collision wall that changes the jet flow from this nozzle in a right angle direction, and a plurality of outflow pipes radially joined to a peripheral wall formed around this wall. Flow divider. 2. The inlet pipe diameter is D1, the inner diameter of the surrounding wall is D2, and the nozzle diameter is L1.
, if the distance from the nozzle part to the collision wall is L2, then D2/D
1<2.0, L1/D1<0.567, L2<30mm
A refrigerant flow divider according to claim 1.