JPH028667A - Flow divider - Google Patents

Abstract

PURPOSE:To keep an equaly divided flow and reduce a pressure loss of a coolant flow by a method wherein a sealed pipe end is provided with a hole smaller than the inner diameter to form a flowing-in end pipe, a flowing-out pipe end is bent to have such a shape as one to reverse its direction of flow and the flowing-in pipe end is displaced to a branched pipe side. CONSTITUTION:When a heat exchanger is an evaporator, coolant is separately flowed as a liquid coolant 24 and a coolant vapor 25 from a direction of arrow 27. Since a diameter of a small hole 22 opened at a flowing-in pipe end 21b of a flow divider 21 is smaller than an inner diameter of a coolant pipe 29, its flow is throttled. The liquid coolant 24 and the coolant vapor 25 are mixed to each other to form a uniform gas-liquid mixture flow 26, directed toward a branched part 23 and further divided into directions shown by arrows 28a and 28b, respectively. In addition, since a height from the flowing-in pipe end 21b to the branch part 23 is small, the gas-liquid mixture flow 26 may not be influenced by its own weight (g) even if its injection speed is not so fast and this an equal and uniform divided flow can be realized.

Description

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

2. Description of the Related Art In recent years, the performance of heat exchangers has been improved by decreasing the diameter of refrigerant pipes, and the number of refrigerant circuits in heat exchangers has increased. Along with this, refrigerant flow dividers are frequently used and their importance is increasing.

The conventional flow divider described above will be described below with reference to the drawings.

FIG. 4 is a perspective view of a conventional flow divider, and FIG. 5 is a sectional view taken along line AA in FIG. FIG. 6 is a front view of a heat exchanger equipped with a conventional flow divider, and FIG. 7 is a right side view of FIG. 6. FIG. 8 is a diagram showing the flow of refrigerant in a conventional flow divider. In Figures 4 to 8, 1 is a flow divider;
a is the inflow side pipe part, 1b is the inflow side pipe end, 1C is the outflow side pipe part, 1d is the outflow side pipe end, 2 is the small hole opened in the inflow side pipe end 1b, 3 is the inside of the flow divider At the branch part, the height from the inflow side pipe end 1b to the branch part 3 and the height from the outflow side pipe end 1d to the branch part 3 are the same Ll. 4 is a heat exchanger, 5 is a heat transfer fin, 6 is a refrigerant pipe, and 7 is an end plate. The distal end 9 of the refrigerant pipe 6 is expanded, and a flow divider 1 and return pends 8a to 8f having the same outer diameter as the refrigerant pipe 6 are inserted and brazed. Moreover, 12a and 12b indicate the refrigerant circuit on the left side of the heat exchanger 4 in FIG.

The refrigerant circuit in the heat exchanger 4 continues from the inlet 1o to the inflow side pipe section 1a of the flow divider 1, and after being divided into the outflow side pipe section 1C,
One side continues to return pendants 8a-8b-8c and reaches outlet 11a. Also, the other side is return pen 8
Continuing to d-8e-fc, it reaches exit 11b.

Next, the operation of the conventional flow divider will be explained. FIG. 8 schematically shows the flow of refrigerant in the flow divider 1 attached to the heat exchanger shown in FIGS. 6 and 7.
The cross section is developed along the flow path. When the heat exchanger is an evaporator, the refrigerant separates into liquid refrigerant 13 and refrigerant vapor 14 and flows in from the direction of arrow 16. Since the diameter of the refrigerant pipe 6 is smaller than the inner diameter of the refrigerant pipe 6, the flow is constricted, and the liquid refrigerant 13 and the refrigerant vapor 14 are mixed to form a homogeneous gas-liquid mixed flow 15, which is ejected from the small hole 2 toward the branch part 3. Arrows 17a and 17
It splits in the direction b. At this time, arrows 1 through a and 17b
In order to evenly divide the refrigerant in the directions, the jetting speed from the small holes 2 must be made so fast that the influence of gravity 2 can be ignored.

Problems to be Solved by the Invention As mentioned above, in the conventional flow divider, in order to achieve uniform flow distribution, it is necessary to increase the jetting speed of the refrigerant from the small holes 2 to such an extent that the influence of gravity 2 can be ignored. For this purpose, since the height Ll from the branch part 3 to the inflow side tube end 1b is increased, it was necessary to make the diameter of the small hole 2 extremely small. However, when the diameter of the small holes 2 is made smaller, the pressure loss of the refrigerant flow increases, which significantly impairs the efficiency of the refrigeration cycle. That is, the conventional flow divider has had the problem of having to reduce the pressure loss of the refrigerant flow while maintaining equal flow division.

Means for Solving the Problems In order to solve the above problems, the flow divider of the present invention has an outflow side pipe section at both ends, is pushed out from approximately the center of the outflow side pipe section, and has a seal of the integrally formed pipe section. A hole smaller than the inner diameter υ is opened at the end of the stop-shaped pipe as an inflow side pipe part, the inflow side pipe part is made substantially straight, and the outflow side pipe part is bent into a shape that reverses the direction of flow, and , the inflow side pipe end is biased toward the branch part with respect to the outflow side pipe end.

Effect of the Invention With the above-described configuration, the height from the branch part of the flow divider to the end of the inlet pipe is small, so the diameter of the small hole drilled in the end of the inflow pipe of the flow divider is increased, and the refrigerant flow is increased. The influence of gravity 2 can be ignored and even flow distribution can be achieved without increasing the jetting speed so much.

EXAMPLE Hereinafter, a flow divider according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a flow divider according to an embodiment of the present invention, and FIG. 2 is a cross section taken along line BB' in FIG. FIG. 3 is a diagram showing the flow of refrigerant in a flow divider according to an embodiment of the present invention.

1 to 3, 21 is a flow divider, 21a is an inflow side pipe section, 21b is an inflow side pipe end, 2IC is an outflow side pipe section,
21d is the outflow side pipe end, 22 is a small hole opened in the inflow side pipe end 21b, 23 is a branch inside the flow divider 21, 29 is a refrigerant pipe of the heat exchanger to which the flow divider 21 is attached, 3o is an expanded end of the refrigerant pipe 29, which is connected from the inflow side pipe end 21b to the branch part 2.
The height L2 up to 3 is from the outflow IU pipe end 21d to the branch part 2.
It is lower than the height L3 up to 3, and the inflow side pipe end 2
The diameter of the small hole 22 made in 1b is relatively large.

The operation of the flow divider configured as described above will be explained below using FIG. 3. FIG. 3 is a schematic diagram showing the flow of refrigerant in a flow divider according to an embodiment of the present invention, and the cross section thereof is developed along the flow path. When the heat exchanger is an evaporator, the refrigerant separates into liquid refrigerant 24 and refrigerant vapor 25 and flows in from the direction of arrow 27. Small hole 22
Since the diameter of the refrigerant pipe 29 is smaller than the inner diameter of the refrigerant pipe 29, the flow is throttled, and the liquid refrigerant 24 and the refrigerant vapor 26 are mixed to form a homogeneous gas-liquid mixed flow 26, which is ejected from the small hole 22 toward the branch part 23. It splits in the direction of arrows 28a and 28b. but,
Since the diameter of the small hole 22 is relatively large, the ejection speed of the gas-liquid mixed flow 26 is not so fast. However, since the height L2 from the inflow side pipe end portion 21b of the flow divider 21 to the branching portion 23 is small, the gas-liquid mixed flow 26 is almost affected by the gravity 2 even if the ejection speed of the gas-liquid mixed flow 26 is not so high. It is possible to reach the branch part 23 without any problems, and it is possible to realize equal branching of the flow.

As described above, according to this embodiment, both ends are connected to the outflow side pipe portion 21.
c and 1-1 A tube section extruded from a substantially central portion of the outflow side tube section 21c and integrally formed is an inflow side tube section 21a, the inflow side tube section 21a is approximately straight, and an inflow side tube end section 21b. A relatively large small hole 22 is bored in the hole 22, and the outflow side pipe portion 2IC is bent into a shape that reverses the flow direction.
In addition, the inflow side pipe end 21b is shifted toward the branch part with respect to the outflow side pipe end 21d, and the inflow side pipe end 21b is moved from the inflow side pipe end 21b to the branch part 2.
3 from the outlet pipe end 21d to the branch part 23.
By setting the height to be lower than the height L3, the pressure loss of the refrigerant flow can be reduced while maintaining equal flow division, and the efficiency of the refrigeration cycle can be improved.

Effects of the Invention As described above, the flow divider of the present invention has both ends as outflow side pipe parts, extrudes from the approximate center of the outflow side pipe part, and has a sealed pipe end of the integrally molded pipe part from the inner diameter. The smaller hole is formed in the inflow side pipe part, the inflow side pipe part is made substantially straight, the outflow side pipe part is bent into a shape that reverses the flow direction, and the inflow side pipe end is made into an outflow side pipe part. By biasing the side tube end toward the branch portion, it is possible to reduce the pressure loss of the refrigerant flow and improve the efficiency of the refrigeration cycle while maintaining equal flow division.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a flow divider according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line BB in FIG. 1, and FIG. Figure 4 is a perspective view of a conventional flow divider, Figure 5 is a sectional view taken along line A-A' in Figure 4, and Figure 6 is a front view of a heat exchanger with a conventional flow divider installed. , FIG. 7 is a right side view of FIG. 6, and FIG. 8 is a diagram showing the flow of refrigerant in a conventional flow divider. 21...Flow divider, 21a...Inflow side pipe section, 21b...Inflow side pipe end, 2IC...
...Outflow side pipe part, 21d...Outflow side pipe end, 2
2...small hole, 23...branch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
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Claims (1)

[Claims] an inflow side pipe part having both ends as outflow side pipe parts, and having a small hole smaller than the inner diameter in the sealed pipe end of the integrally molded pipe part, which is extruded from a substantially central part of the outflow side pipe part; A branched flow in which the pipe part is approximately straight, the outflow pipe part is bent into a shape that reverses the flow direction, and the inflow pipe end is biased toward the branch part with respect to the outflow pipe end. vessel.