JPH02306070A - Refrigerant flow divider - Google Patents

Abstract

PURPOSE:To provide a miniaturized and low-cost flow divider capable of effecting uniform divided flow by installing an inflow pipe with a nozzle outflow hole, a collision wall changing the flow of the outflow jet into the vertical direction to the jet inflow, and minimizing the volume surrounded by peripheral walls so that the standing liquid and standing vapor are not formed. CONSTITUTION:Refrigerant B flows into a flow divider 13 from an inflow hole 14 in two phases of a vapor phase B1 and a liquid phase B2 and after it passes through an inflow pipe 16, it is spouted from a small hole 15. At that time, the two phases are contracted and accelerated by a nozzle action and flow out as a jet and collided with a collision wall 17 at the top and agitated and mixed and is dispersed radially along the wall 17 and flows out into inflow holes 19 of outflow pipes 21 attached to the peripheral walls 18 and flows dividedly. At that time in the volume surrounded by the walls 17 and 18 the standing liquid and standing vapor are not formed, and therefore, the mixed condition of the liquid and vapor of the refrigerant B is uniformed by a nozzle effect and left as it is and as the inner diameter of the hole 19 is reduced, divided flow to each of the pipes 21 is uniformed by the throttle effect due to the reduced diameter hole 19.

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 4 and 6 show the shape of a conventional flow divider, Figure 6 shows how the flow divider is attached to the heat exchanger, and Figure 7 shows the state when the heat exchanger is operated in a refrigeration cycle. This shows the refrigerant condition inside the flow divider. In Figures 4 to 7, 1 is a flow divider;
It is composed of an inflow pipe 4 having an inflow port 2 and an outflow port 3 at the other end, a conical side 6 and a cylindrical body 6 following the inflow port 2, and a plurality of outflow pipes 9 each having an inflow lower end and an outflow port 8 at the other end. There is.

1o is a refrigerant branch.

Further, 11 is a heat exchanger which constitutes a refrigerant circuit with 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. 6 and 7.

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 from the inlet 2 as a two-phase flow of gas phase A1 and liquid phase A2.
A plurality of outflow pipes 9a, 9 pass through the cylindrical body 6 and at the branch part 1o.
b, and flow out into the refrigerant pipes 12a, 12b via the outlet sa, sb, respectively. At this time, a part of the refrigerant A is not smoothly flowed out from the outflow pipes 9a and 9b, and a part of the liquid phase A2 collides with the upper wall surface of the cylindrical body 6 and falls. It stays and circulates, forming a liquid reservoir. Similarly, a part of the gas phase A1 stays and circulates in the upper part of the cylindrical body 6, forming an air groove.

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 conical side 69 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, in the branching portion 10, there was a problem in that the refrigerant could not be equally distributed in weight to the outflow pipes 9a, 9b and the subsequent refrigerant pipe 12. In addition, since the attempt is made to improve the flow division even slightly due to the resistance caused by the outflow pipe 9 at the rear, the inner diameter of the outflow pipe 9 and the refrigerant pipe 12 following it cannot be made much smaller, and therefore, the pressure loss cannot be reduced. I had an issue. 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 has a cylindrical flow divider part with one end serving as a collision wall, a cylindrical flow divider part that engages with an inlet, and a small hole in the outlet end. It is composed of an inlet pipe which has been machined, and a plurality of outflow pipes which are joined to the circumferential wall of a cylindrical branch part with a narrowed inner diameter at the joint part.

Effect of the Invention With the above-described configuration, the present invention jets out a flow of gas-liquid separated refrigerant flowing through an inflow pipe from a small hole at the outflow end of the inflow pipe, and collides this flow with an opposing collision wall surface, thereby reducing the jetting effect by the nozzle and the collision wall surface. Collision and disturbance effects promote gas-liquid mixing and promote homogenization of the gas-liquid two-phase flow.In addition, since the inner diameter is narrowed at the inlet of the outlet pipe arranged in the radial direction, the constriction effect Since a two-phase flow is ejected, the flow distribution to each outflow pipe is equalized. At this time, by reducing the volume surrounded by the collision wall and the peripheral wall, the formation of liquid pools and air grooves can be eliminated, and the flow can be divided evenly without reducing the jet effect. Since it is radially joined to the peripheral wall of the cylindrical flow divider, it can be made smaller and lower in cost than 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 includes an inlet pipe 16 having an inlet 14 and a small hole 15 at the other end, a collision wall 17 that receives the jet from the small hole 16, a peripheral wall 18 surrounding it, and an inner diameter A plurality of outlet pipes 21 each having a narrowed inlet 19 and an outlet 2Q at the other end are attached radially to the central axis of the flow divider 13.

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 is ejected through the small hole 16.

At this time, the two-phase flow is contracted and accelerated by the nozzle action, and flows out as a jet flow. 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, flows out into the inlet 19 of the outflow pipe 21 attached to the peripheral wall 18, and is divided into streams. At this time, since no liquid reservoir or air groove 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 nozzle effect. Since the inner diameter of the inflow port 19 is narrowed, a homogenized two-phase flow is jetted out due to its throttling effect, so that the branched flow to each outflow pipe 21 is equalized. Further, since there is no need to improve the flow division due to the resistance at the rear of the outflow pipe 21, the inner diameter of the outflow pipe 21 and the refrigerant pipe (not shown) following it can be increased, so that pressure loss can be reduced.

As described above, according to this embodiment, the small hole 15 is provided in the inflow pipe 16.
and a collision wall 17 and a peripheral wall 1 that receive the outflow jet.
By reducing the volume surrounded by 8 so as not to form liquid pools and air grooves, the mixed state of the gas-liquid two-phase flow of refrigerant B flowing into the flow divider 13 is made uniform and maintained. is completed, and furthermore, the inlet 1 of each outlet pipe 21 is
Due to the 90 diaphragm effect, a homogenized two-phase flow is ejected,
The refrigerant can be equally divided into each outlet pipe 21 and its subsequent refrigerant pipe (not shown).

Effects of the Invention As described above, the present invention includes an inflow pipe having a nozzle outlet and a collision wall that changes the flow of the outflow jet in the vertical direction, and also prevents the formation of liquid reservoirs and air grooves. By reducing the volume surrounded by the surrounding wall, the mixing of the gas-liquid two-phase flow is made uniform, and by narrowing the inner diameter of the inlet of the outflow pipe radially joined to the surrounding wall, the two-phase flow is ejected. It is possible to divide the refrigerant evenly, and at the same time, due to its structure,
Small size and low cost are possible.

[Brief explanation of the drawing]

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. 4 is a perspective view showing the general shape of a conventional flow divider, Figure 5 is a sectional view of Figure 4, and Figure 6 shows how the flow divider shown in Figure 4 is attached to a heat exchanger. FIG. 7 is a perspective view showing the state, and FIG. 7 is a sectional view showing the flow of refrigerant when the flow divider of FIG. 4 is in use. 13... Flow divider, 16... Small hole, 16
......Inflow pipe, 17...Collision wall, 18.
... Peripheral wall, 21 ... Outflow pipe, 19 ...
...Inlet. Name of agent: Patent attorney Shigetaka Awano and 1 other person13
- Flow divider Figure 3 - S -, o l mi (Batoゝ-N \ \ ・N, ++\ guQ -gi (\% to N") - Figure 6 Figure 7 ◇

Claims (1)

[Claims] a cylindrical branch part with one end serving as a collision wall; an inflow pipe that engages with the inlet of the cylindrical branch part and has a small hole machined in the outlet end;
A refrigerant flow divider consisting of a plurality of outflow pipes connected to a circumferential wall of a cylindrical flow distribution part with a narrowed inner diameter of the joint.