JPH02275266A - Refrigerant shunt - Google Patents

Abstract

PURPOSE:To carry out the uniform OK of a refrigerant and make the miniaturization and low cost of a device by installing a cylindrical OK part, one end of which is a collision wall, a plurality of outflow pipes connected to the peripheral wall of the OK part radially, a stepped throttle part which is mated with the inner circumference and limits the distance from the collision wall, and an inflow pipe, on the outflow end of which a small hole is cut are equipped. CONSTITUTION:A refrigerant B flowing in the closed circuit of a refrigeration cycle flows into a 13, one end of which is a collision wall, in two phases of a vapor phase B1 and a liquid phase B2. The refrigerant flows through an inflow pipe 17 fitted with a small hole and is accelerated by a stepped throttle part 16 which limits the distance L from the collision wall in L<30mm and then spouted by a small hole 15. The jet of the refrigerant B contracted and accelerated by the small hole action is collided with the collision wall 18 at the top and agitated and mixed. The refrigerant B unified thereby is dispersed radially along the collision wall 18 and flows into the inlet holes 20 of the outflow pipes 22 attached to the peripheral wall 19 and OK. As the standing liquid and standing vapor are not formed in the space surrounded by the walls 18 and 19, the refrigerant in the mixed condition of the vapor and liquid flows uniformly and separately. The refrigerant B flows into refrigerant pipes 23 from the outlet holes 21 of the respective pipes 22.

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 as heat exchanger tubes become smaller in diameter, 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 5 to 6 show the shape of a conventional flow divider, Figure 7 shows how the flow divider is attached to a heat exchanger, and Figure 8
The figure shows the state of the refrigerant inside the flow divider when the heat exchanger is operated in a refrigeration cycle. 5 to 8, 1 is a flow divider, which includes an inlet pipe 4 having an inlet 2 and an outlet 3 at the other end, a conical steel 6 and a cylindrical body 8, and a lower inlet and an outlet 3 at the other end. It is composed of a plurality of outflow pipes 9 each having an outlet 8. 1o 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. 7 to 8.

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 inlet 2 as a two-phase flow of a gas phase A1 and a liquid phase A2.
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 sa and sb, respectively.
2a.

It will flow out to 12b. At this time, a part of the refrigerant A is not smoothly flowed out from the outflow pipes 9a and 9b, and the liquid phase A
2 collides with the upper wall of the cylindrical body 6 and falls, forming the conical net 6.
Alternatively, the liquid accumulates and circulates in 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 inlet 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 conical mesh 62 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 pipe 12a following them,
There was a problem in that it was not possible to divide the refrigerant into the refrigerant 12b evenly in weight.

Furthermore, since the flow divider 1 has a plurality of outflow pipes 9 connected to one end thereof, it is inevitably large and expensive.

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

Means for Solving the Problems In order to solve the above problems, the flow divider of the present invention includes a cylindrical flow divider portion with one end serving as a collision wall, a plurality of outflow pipes radially joined to the peripheral wall of the flow divider portion, and a cylindrical Distance L f L < 30 rr that engages with the inner periphery of the flow dividing part and from the collision wall
It consists of a stepped constriction section with a diameter of rm and an inflow pipe with a small hole formed at the outflow end.

Effect of the Invention With the above-described configuration, the present invention accelerates the flow of gas-liquid separated refrigerant flowing through the inflow pipe at the stepped constriction portion of the inflow pipe, and then
The gas is ejected from the small hole at the outflow end, this flow collides with the opposing collision wall, and the gas-liquid mixture is accelerated by the throttle, the ejection effect from the small hole, the collision at the collision wall, and the disturbance effect.
The purpose is to promote uniformity of the gas-liquid two-phase flow, and to equally distribute the flow to each refrigerant pipe by causing the refrigerant to flow smoothly to the outflow pipes arranged in the radial direction. 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. In addition, since the outflow pipe is radially joined to the peripheral wall of the cylindrical flow divider, it is possible to reduce the size and cost compared to conventional flow dividers.

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 has an inlet 14 and a small hole 16 at the other end, an inlet pipe 17 having a stepped constriction 16, a collision wall 18 that receives the jet from the small hole, and a peripheral wall 19 surrounding it. Furthermore, a plurality of outlet pipes 22 each having an inlet 2o and an outlet 21 at the other end are attached radially to the central axis of the flow divider 13. Reference numeral 23 denotes a refrigerant pipe, which is the same as in the conventional example, and is connected to the outlet 21. L is the distance from the small hole to the impact wall.

FIG. 4 shows the ratio of divided flow to each outflow pipe when the L dimension of the flow divider is changed (in this example, there are three divided flows). 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 17 and being accelerated by the stepped constriction section 16, it is ejected from the small hole 16.

At this time, the two-phase flow is contracted and accelerated by the action of the small holes, and flows out as a jet flow. Thereafter, the jet of refrigerant B collides with the top collision wall 18 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 18, flows out into the inlet 20 of the outflow pipe 22 attached to the peripheral wall 19, and is divided. At this time, since no liquid pool or air pool is formed in the volume surrounded by the collision wall 18 and the peripheral wall 19, the gas-liquid mixing state of the refrigerant B remains uniform due to the effect of the small holes. , therefore, the flow will be divided equally. The refrigerant B evenly distributed to the outflow pipes 22 flows from the outlet 21 of each outflow pipe 22 to the refrigerant pipe 2.
It will flow to 3.

Further, since the outflow pipe 22 is radially connected to the cylindrical flow dividing portion local wall, it is possible to reduce the size and cost compared to the conventional flow divider.

As described above, according to this embodiment, the inflow pipe 17 is provided with the stepped constriction part 16 and the small hole 16, and the volume surrounded by the collision wall 18 and the peripheral wall 19 that receive the outflow jet is filled with a liquid pool and a gas pool. By making the gas-liquid two-phase flow of the refrigerant B flowing into the flow divider 13 small, the mixing state of the gas-liquid two-phase flow of the refrigerant B flowing into the flow divider 13 can be made uniform and maintained.
And the subsequent branch flow of the refrigerant to the refrigerant pipes 23 can be made nearly uniform. At this time, if the L dimension is limited to the range shown in the claims as shown in FIG. 4, the effect can be maintained, and the stepped throttle section 16 not only accelerates but also limits the dimension easily and reliably. Ru.

Effects of the Invention As described above, the present invention includes an inflow pipe having a stepped constriction portion and a small hole, and an impingement wall that changes the flow of the outflow jet in the vertical direction. By reducing the volume surrounded by the peripheral wall to prevent the formation of air pockets, the refrigerant can be divided evenly, and at the same time, the structure allows for size and cost reduction.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the schematic shape of a flow divider in an embodiment of the present invention, Fig. 2 is a sectional view of Fig. 1, and Fig. 3 shows the flow of refrigerant when the flow divider of Fig. 1 is in use. A cross-sectional view, FIG. 4 is a graph showing the relationship between the distance from the small hole to the collision wall and the flow division ratio, and FIG. 6 is a perspective view showing the schematic shape of a conventional flow divider.
Figure 6 is a sectional view of Figure 6, Figure 7 is a perspective view showing how the flow divider in Figure 6 is attached to the heat exchanger, and Figure 8 is the flow divider in Figure 6 when it is in use. FIG. 3 is a cross-sectional view showing the flow of refrigerant. 13... Flow divider, 16... Small hole, 17
......Inflow pipe, 18...Collision wall, 19.
... Peripheral wall, 22 ... Outflow pipe, 16 ...
...Stepped constriction section, L...Distance from the collision wall. Name of agent: Patent attorney Shigetaka Awano and 1 other person 2nd
Figure 13--1 minute i False +5-1・small 几16- Stepped constriction section 13- Branch channel 15- Nozzle 5 outlet 16- Throttle with crotch 17- Inflow pipe +8-- M 9 W tq- --M wall 22--first outlet pipe (mm)

Claims (1)

[Claims] A cylindrical flow divider with one end serving as a collision wall, a plurality of outflow pipes radially joined to the peripheral wall thereof, and a plurality of outflow pipes that are engaged with the inner periphery of the cylindrical flow divider, and the distance L from the collision wall is L< 30mm
A refrigerant flow divider consisting of a stepped constriction section and an inlet pipe with small holes at the outlet end.