JP2001141333A - Branch pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a branch pipe for branching refrigerant uniformly at low manufacturing cost. SOLUTION: The branch pipe 1 comprises a fluid inlet section 1a, a branch connecting section 1d for branching fluid from the inlet section 1a to a plurality of channels, and a plurality of outlet sections 1b, 1c for delivering the fluid through the branch connecting section 1d. A barrier wall 5 for splitting the fluid to a plurality of channels is provided in the pipe between the inlet section 1a and the branch connecting section 1d along the gravitational direction fixed with the branch pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe used for dividing a refrigerant in a vapor compression refrigeration cycle.

[0002]

2. Description of the Related Art In recent years, a large number of branch pipes have been used in accordance with the increase in the number of heat exchangers of a refrigeration / air-conditioning apparatus. Hereinafter, a conventional branch pipe will be described with reference to the drawings.

FIG. 19 is a perspective view showing a state in which a conventional branch pipe is attached to a heat exchanger, FIG. 20 is a perspective view showing the shape of a conventional branch pipe, and FIG. 21 is a diagram showing a state in which the heat exchanger is connected to a refrigeration cycle. FIG. 4 is a cross-sectional view showing a state of flow of a refrigerant inside a conventional branch pipe when the conventional branch pipe is operated. In the figure, 1 is a branch pipe, 2
Is a U-shaped tube, 3 is a heat exchanger main body, 4 is a heat exchanger tube constituting a heat exchanger and through which a refrigerant flows, particularly 4a is an inlet pipe to the branch pipe 1, 4b and 4c are outlets from the branch pipe 1. Plumbing, 6
Denotes the flow direction of the refrigerant passing through the branch pipe 1, and 10 denotes the direction of gravity. Here, the U-shaped tube 2 and the heat transfer tube 4 and the branch tube 1 and the heat transfer tubes 4a, 4b and 4c are welded by brazing. 1a is a branch pipe inlet, 1b and 1c are branch pipe outlets, 8a, 8b and 8c are liquid phase portions of refrigerant, 8a and 7
Reference numerals b and 7c denote a gas phase portion of the refrigerant, and 9a, 9b and 9c denote the entire refrigerant including the liquid phase portion and the gas phase portion of the refrigerant.

The operation of the branch pipe 1 configured as described above will be described with reference to FIG. The refrigerant 9a is
The refrigerant gas phase 7a is located at the center of the heat transfer tube, and the refrigerant liquid phase 8a
Is separated into gas and liquid in a state close to an annular flow flowing in the form of a film around the inner wall surface of the heat transfer tube, flows in from the branch pipe inlet 1a, and is diverted to the branch pipe outlets 1b and 1c to flow out.

Another conventional branch pipe is disclosed in
-254239. FIG.
FIG. 23 is an external view showing another conventional branch pipe, and FIG.
It is sectional drawing which shows the flow state of the refrigerant | coolant inside a branch pipe when operating a heat exchanger in contact with the refrigeration cycle. In the figure, 1 is a branch pipe, 1a is a branch pipe inlet, 1b and 1c are branch pipe outlets, and 16 is a spiral plate. The spiral plate 16 is inserted inside the branch pipe inlet 1a.

The operation of the branch pipe 1 configured as described above will be described below with reference to FIG. The liquid phase portion 8a of the refrigerant and the gas phase portion 7a of the refrigerant flow from the branch pipe inlet 1a. At this time, the liquid phase portion 8a of the refrigerant and the gas phase portion 7 of the refrigerant
Although a is gas-liquid separated in a state close to an annular flow, the gas-liquid is turbulently mixed by the spiral plate 16 when flowing through the branch pipe inlet 1a, and is then separated into the branch pipe outlets 1b and 1c. leak.

[0007]

However, FIG.
In the conventional branch pipe described in 0 and 21, the liquid phase portion 8a of the refrigerant, which is heavier than the gas phase portion 7a of the refrigerant at the time of branching, is affected by gravity 10 and adheres to the wall surface of the branch portion.
There is a problem that the refrigerant 9a flows too much to the branch pipe outlet 1c, so that the refrigerant 9a cannot be uniformly distributed to the branch pipe outlets 1b and 1c, and the cooling performance of the heat exchanger is reduced. Further, it was impossible to divide the flow into a desired flow ratio.

Further, in the branch pipe described in Japanese Patent Application Laid-Open No. 1-254239, the spiral plate 16 is used to connect the refrigerant 8a with the refrigerant 8a.
The gas phase 7a of the refrigerant is gas-liquid mixed, but the gas phase 7a of the refrigerant is mixed.
The liquid phase portion 8a of the heavier refrigerant is affected by the gravity 10 and the whole mixed refrigerant 9a collides with and adheres to the wall surface at the branch portion, so that a large amount of the refrigerant 9a flows to the branch pipe outlet portion 1c and is uniform. Could not be diverted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a branch pipe capable of achieving a uniform distribution of refrigerant and a desired refrigerant distribution ratio without being affected by gravity. Aim.

[0010]

A branch pipe according to the present invention comprises:
An inlet portion through which fluid flows into the branch pipe main body, a branch portion for branching the fluid flowing from the inlet portion into a plurality of flow paths, and a plurality of outlet portions for flowing out the fluid flowing through the branch portion. In the branch pipe, a partition wall provided along the direction of gravity when the branch pipe main body is attached and provided in the pipe from the inlet to the branch is provided, and is divided into a plurality of flow paths.

[0011] Further, an inlet portion into which the fluid flows into the branch pipe main body, a branch portion for branching the fluid flowing from the inlet portion into a plurality of flow paths, and a plurality of outlets for discharging the fluid flowing through the branch portion. In the branch pipe provided with the branch part, near the inlet part, it is arranged along the direction of gravity in the attached state of the branch pipe main body, twisted as approaching the branch part, and a plurality of flow paths near the branch part The partition wall is arranged so as to be perpendicular to the branching direction.

The partition is provided in a straight line from the entrance to the branch.

Further, the end of the partition on the side of the entrance is formed in a wedge shape.

The partition has a gap near the axis of the tube.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG.
1 is a perspective view showing a branch pipe according to Embodiment 1 of the present invention. In the figure, 1a is a branch pipe inlet portion formed of a straight pipe, 1b and 1c are branch pipe outlet portions formed of a bent pipe, 1d
Is a branch pipe connection part of a straight pipe perpendicular to the branch pipe inlet part 1a and constitutes a branch part of the branch pipe. Reference numeral 5 denotes a partition wall, and 11 denotes a central axis of the branch pipe inlet 1a. The branch pipe 1 forms a branch pipe inlet 1a and a branch pipe connection 1d as a T-shaped pipe, and branches to the remaining end other than the substantially center of the T-tube consisting of the branch pipe inlet 1a and the branch pipe connection 1d. The pipe outlets 1b, 1c are welded by brazing. Here, the branch pipe inlet 1a and the branch pipe outlets 1b, 1c are respectively connected to the inlet pipe 4a and the outlet pipes 4b, 4c shown in FIG. The partition wall 5 is welded to the inner wall of the pipe at the branch pipe inlet 1a and the branch pipe connection 1d by brazing. This branch pipe is used for a heat exchanger as shown in FIG. 19 in the conventional example.

Here, coordinate axes are determined with reference to FIG. 2 in order to make the description of the mounting posture of the branch pipe 1 easy to understand. In FIG. 2, 12 indicates the X axis, 13 indicates the Y axis, 14 indicates the Z axis, and 15 indicates the origin. The origin 15 is the branch outlet 1b,
The midpoint of the line connecting the centers of the pipe sections at the end 1c. The X axis is a straight line parallel to the central axis 11 of the branch pipe inlet 1a and passing through the origin 15, the Y axis 13 is a straight line connecting the origin 15 and the center of the pipe cross section at the end of the branch pipe inlet 1a, and the Z axis 14 is a branch pipe. Exit 1
b, 1c are straight lines connecting the centers of the pipe sections at the ends. Also,
The X-axis direction is set to the refrigerant inflow direction of the branch pipe inlet 1a, and Y
The axial direction and the Z-axis direction are determined to be a right-handed system. FIG. 1 shows an example of the mounting posture of the branch pipe 1 when the Z axis is vertical.

Next, how the partition 5 is attached will be described with reference to FIG. FIG. 3 is a cross-sectional view of the branch pipe 1 of FIG. 1 viewed from the −Y axis direction. In the figure, the partition wall 5 is arranged near the branch pipe inlet 1a so as to pass through the center of the pipe along the direction of gravity 10 in the attached state of the branch pipe 1, and is twisted 90 degrees as approaching the branch. In the vicinity, it is brazed so as to be perpendicular to the branch direction of the branch connection part 1d.

The operation of the branch pipe 1 configured as described above will be described below. First, the state of the refrigerant flowing into the branch pipe 1 will be described with reference to FIGS.
4 and 5 are cross-sectional views of the conventional inlet pipe 4a shown in FIG. In FIG. 4, 7a is a gas phase portion of the refrigerant, 8a is a liquid phase portion of the refrigerant, 9a
Denotes a whole refrigerant including the gas phase portion 7a of the refrigerant and the liquid phase portion 8a of the refrigerant, and 20 denotes a vertical axis passing through the center of the pipe.

As shown in FIG. 4, most of the distribution of the cross section of the refrigerant 9a in the inlet pipe 4a is such that the gas phase 7a of the refrigerant flows through the center of the inlet pipe 4a and the liquid phase 8a of the refrigerant flows in the inlet pipe 4a. 5, or the liquid phase portion 8a of the refrigerant having a large specific gravity flows under the inlet pipe 4a under the influence of gravity, as shown in FIG. Is distributed such that a large amount of the gas phase portion 7a flows above the inlet pipe 4a. 4 and 5, the distribution of the gas phase portion 7a of the refrigerant and the liquid phase portion 8a of the refrigerant in the cross section of the inlet pipe 4a are different from those of the vertical axis 20.
Is almost axially symmetric with respect to.

Next, the state of the refrigerant 9a immediately after flowing into the branch pipe inlet 1a will be described with reference to FIGS. 6 and 7 are cross-sectional views of the end of the branch pipe inlet 1a as viewed from the -X axis direction. 6 and 7, reference numerals 7b and 7c denote gas phase portions of the refrigerant, 8b and 8c denote liquid phase portions of the refrigerant, and 9b and 9c denote gas phase portions 7b and 7c of the refrigerant and liquid phase portions 8b and 8c of the refrigerant, respectively. Shows the entire refrigerant combined with. The refrigerant 9a flowing into the branch pipe inlet 1a is separated by the partition 5 into the refrigerant 9b and the refrigerant 9c.
Shunted. Here, in the vicinity of the branch pipe inlet 1a, the partition wall 5 is connected to the gravitational direction 1 with the branch pipe 1 attached.
0, the gas phase portion 7b of the refrigerant after being divided by the partition wall 5
And 8b, the flow rates of the liquid phase portions 7c and 8c of the refrigerant are substantially equal, and the gas phase portions 7b and 7c of the refrigerant and the liquid phase portions 8b and
The flow rates of the entire refrigerants 9b and 9c, which are the sums of the respective refrigerants 8c, are also substantially equal.

The flow of the refrigerant passing through the branch pipe inlet 1a and proceeding to the branch pipe outlets 1b and 1c will be described with reference to FIG. FIG. 8 is a cross-sectional view of the branch pipe 1 as viewed from the −Y axis direction. In FIG. 8, a hatched area indicates the refrigerant 9c flowing in the pipe, and a dotted portion indicates the refrigerant 9b flowing in the pipe. Here, the partition wall 5 is composed of the branch pipe inlet 1a and the branch pipe connection 1
d, the refrigerants 9b, 9c diverted by the partition wall 5 at the entrance of the branch pipe entrance 1a.
Flows out of the branch pipe outlets 1b and 1c without merging along the twist of the partition wall 5, respectively.

As described above, according to the present embodiment, it is possible to effectively and uniformly divide the refrigerant 9a having a distribution substantially axisymmetric with respect to the vertical axis 20 in the straight pipe portion of the heat transfer tube 4. Becomes Further, the branch pipe 1 is attached to the end of the straight pipe part of the heat transfer pipe 4 and the branch pipe inlet 1 which is a straight pipe part.
Since the refrigerant is branched at a, the refrigerant can be divided in a more stable state than a conventional branch pipe that divides the refrigerant after passing through a curved pipe, and the effect of improving the uniform branching performance can be obtained. Furthermore, since the partition wall 5 is twisted at the straight pipe portion of the branch pipe inlet 1a, the processing and welding of the partition wall 5 are easier than welding the partition wall 5 in a bent pipe, and the manufacturing cost is reduced. Can be.

In the first embodiment, the Z-axis 14 of the branch pipe 1 is positive upward in the vertical direction, and the branch pipe 1 connects the branch pipe inlet 1a of the straight pipe and the branch pipe connection 1d of the straight pipe. The branch pipe outlets 1b and 1c of the bent pipe are formed by a T-shaped pipe.
An example of a structure in which a T-tube consisting of a branch pipe inlet portion 1a and a branch pipe connection portion 1d is welded to the other end that is not substantially at the center, and the partition wall 5 is attached so as to overlap the vertical axis 20 at the branch pipe 1 inlet. Listed. However, the mounting posture of the branch pipe 1, the structure and processing method of the branch pipe 1, the structure and processing method of the partition wall, the mounting method, and the mounting posture are arbitrary, and at least the partition wall 5 is connected to the inlet pipe 4 a to be connected to the inlet pipe 4 a. Part 1
a, the gravitational direction 1 when the branch pipe 1 is attached.
It is sufficient that the refrigerants 9b and 9c are provided along 0 and flow out of the branch pipe outlets 1b and 1c without being merged in the branch pipe 1.

Hereinafter, modified examples will be listed with reference to the drawings. First, a modified example of the posture and structure of the branch pipe 1 will be described. FIG. 9A is a perspective view of a branch pipe in a case where the Y axis is set in a vertically upward direction. In this case, the partition wall 5 need not be twisted. FIG. 9B is a perspective view of the branch pipe when the branch pipe connection part 1d and the branch pipe outlet parts 1b and 1c are formed by bending pipes, and the branch pipe inlet part 1a is welded thereto.
FIG. 9 (c) shows a branch pipe outlet 1b and a branch pipe outlet 1b,
It is a perspective view of the branch pipe when c is welded.

Next, a modification of the structure of the partition 5 will be described. FIG. 10A shows the case where the partition wall 5 is longer than the end of the branch pipe inlet 1a. FIG. 10B shows a case where the partition wall 5 is shorter than the end of the branch pipe inlet 1a. FIG. 11A shows a case where the end of the partition 5 is inclined with respect to the YZ plane.
FIG. 11B shows a case where the end of the partition wall 5 has a wedge shape.
(C) shows a case where the partition wall 5 is attached in a bent shape. Here, when the tip of the partition wall 5 is formed in a wedge shape as shown in FIG. 11B, the thickness of the partition wall at the time of branching can be made smaller, and the pressure loss of the partition wall 5 becomes smaller. It can be evenly divided. FIG.
In (c), a desired distribution ratio can be obtained.

FIG. 12A shows a case where the end of the partition wall 5 is cut on the upper side and the lower side, and FIG.
FIG. 12C is a diagram illustrating the state of the partition wall 5 viewed from the axial direction, and FIG. 12C is a diagram illustrating the state of the partition wall 5 viewed from the Y axis. FIG. 12D is a diagram showing the heat transfer tube 4a having a spiral groove on the inner wall. FIG.
(E) shows a heat transfer tube 4a having a spiral groove on the inner wall as shown in FIG.
FIG. 3A is a view in which the branch pipe 1 shown in FIG. 1A is attached, and the inside of the wall of the heat transfer pipe 4a and the branch pipe inlet 1a is viewed from the central shaft 11.

In the drawing, 16 is a spiral groove, 17 is the flow direction of the refrigerant liquid phase passing between the spiral grooves 16, 18 is the opening angle of the partition wall 5 with respect to the central axis 11, and 19 is the inclination of the spiral groove with respect to the central axis 11. Corner, where the spiral groove 16
Is equal to the opening angle 18 of the partition 5.
The flow of the refrigerant will be described with reference to FIG. Heat transfer tube 4
In the case where the spiral groove 16 is present inside a, the flow direction 17 of the liquid phase portion of the refrigerant flowing between the spiral grooves 16 is equal to the inclination angle 19 of the spiral groove. The opening angle 18 of the partition 5 is
Since it is equal to the inclination angle 19 of the spiral groove, the flow direction 17 of the liquid phase portion of the refrigerant flowing in the spiral groove is parallel to the partition wall 5.
Therefore, the resistance that the refrigerant receives from the partition wall 5 is reduced, and the effect that the refrigerant can be divided without increasing the pressure increase on the refrigerant side is exerted.

FIG. 13 shows a case where the partition wall 5 of the present invention is attached to the branch pipe of FIG. 19 described as a conventional example. In the branch pipe 1 shown in FIG.
This makes it difficult to manufacture and attach the partition walls, but on the other hand, because the conventional branch pipe 1 can be used, the die cost for manufacturing the branch pipe 1 can be saved and the conventional manufacturing technology is utilized. Thus, there is an effect that the manufacturing cost can be reduced.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 14 (a)
Is a perspective view showing a branch pipe 1 according to Embodiment 2 of the present invention. The description of the branch pipe 1 is omitted because it is common to the first embodiment. FIG. 14B shows a branch pipe inlet 1a.
FIG. 4 is a cross-sectional view of the end portion viewed from the −X axis direction. Here, the partition 5 is not formed by welding a single plate, but is formed by processing fins inside the branch pipe inlet 1a.
In FIG. 14 (b), the upper and lower partitions 5 are arranged at the end of the branch pipe inlet 1a along the direction of gravity in the state where the branch pipe main body is attached, as shown in FIG. 14 (a).
While moving in the flow direction 6 of the refrigerant in the branch pipe inlet 1a, 9
0 degree twist, branch pipe connection 1d inside branch pipe connection 1d
The state is perpendicular to the branching direction of d.

The operation of the branch pipe 1 configured as described above will be described below. As shown in FIG. 4 of the first embodiment, the refrigerant flowing in the heat transfer tube 4 is such that the gas phase portion 7a of the refrigerant flows through the central portion of the heat transfer tube 4a and the liquid phase portion 8 of the refrigerant.
is distributed such that a is annular along the inner wall surface of the heat transfer tube 4a, or as shown in FIG. 5, the liquid phase portion 8a of the refrigerant having a large specific gravity is under the influence of gravity to be below the heat transfer tube 4a. Flows into the heat transfer tube 4a.
It becomes a distribution that flows more on the upper side of.

Next, the state of the refrigerant immediately after passing through the branch pipe inlet 1a will be described with reference to FIGS. As shown in FIGS. 15 and 16, the liquid phase portion 8a of the refrigerant flowing into the branch pipe inlet 1a is divided by the partition wall 5 into the refrigerant 8b and the refrigerant 8c. On the other hand, the gas phase portion 7a of the refrigerant
Does not branch completely. Thereafter, the liquid phase portion 8b of the refrigerant
And 8c proceed through the branch pipe inlet 1a, but as shown in FIGS. 15 and 16, the distribution of the refrigerant gas phase 7a passes through the center of the pipe, so that the refrigerant liquid phases 8b and 8c merge slightly. Only reaches the branch pipe connection part 1d only after that, each flows out from the branch pipe outlets 1b and 1c. Thereby, the flow rates of the liquid phase portions 9b and 9c of the refrigerant become substantially equal. On the other hand, the refrigerant gas phase portion 7a is not strongly affected by gravity, and the refrigerant liquid phase portions 9b and 9c are almost uniformly diverted so that the refrigerant gas phase portion flows through the branch pipe outlets 1b and 1c. Since the cross-sectional areas are substantially equal, the gas phase of the refrigerant is also substantially uniformly diverted.

As described above, according to the second embodiment,
As in the first embodiment, it is possible to effectively and uniformly divide the refrigerant 9a having a distribution substantially axisymmetric with respect to the vertical axis 20 in the straight pipe portion of the heat transfer tube 4. Further, the branch pipe 1 is attached to the end of the straight pipe part of the heat transfer pipe 4 and branches the refrigerant at the branch pipe inlet 1a which is a straight pipe part. There is an effect that the refrigerant can be distributed in a more stable state and equal distribution can be realized. Further, since the partition wall 5 is twisted at the straight pipe portion of the branch pipe inlet 1a, the processing and welding of the partition wall 5 are clearly easier than welding the partition wall 5 in a bent pipe. Further, by processing the partition walls 5 as fins, it is possible to increase the degree of freedom of the method of manufacturing the partition walls 5 and to expect a reduction in manufacturing cost.

In the present embodiment, the Z-axis 14 of the branch pipe 1 is positive upward in the vertical direction, and the branch pipe 1 connects the branch pipe inlet 1a of the straight pipe and the branch pipe connection 1d of the straight pipe to T. An example of a structure in which the partition wall 5 is formed by forming a bent pipe by welding the branch pipe outlets 1b and 1c of the bent pipe to the remaining end which is not substantially at the center and processing fins on the wall surface of the branch pipe inlet 1a. However, the mounting posture of the branch pipe 1, the structure and processing method of the branch pipe 1, the structure and processing method of the partition wall, the mounting method, and the mounting posture are arbitrary.

Hereinafter, modified examples of the partition wall 5 will be described with reference to the drawings. FIGS. 17, 18A and 18B are cross-sectional views of the partition wall 5 viewed from the −X axis direction. FIG. 17 shows a case where a fin having a height substantially equal to the inner diameter of a straight pipe is used as the partition wall 5.
FIG. 18A shows a case where the partition wall 5 has a blunt tip shape.
(B) shows a case where a short fin is used as the partition wall 5. In the branch pipe 1 shown in FIG. 17, when the liquid phase portions 8b and 8c of the refrigerant are largely distributed at the bottom inside the branch pipe inlet 1a, FIG.
In the branch pipe 1 of (a), (b), the liquid phase portions 8b, 8
It is needless to mention that when c is distributed in a thin film shape around the inner wall surface of the branch pipe inlet 1a, the same effects as those described in the above embodiments can be obtained. Here, in the branch pipe 1 of FIG. 17, since only one partition wall 5 is required, an effect that the number of parts can be reduced is produced. on the other hand,
In the branch pipe 1 shown in FIG. 18A, the partition wall 5 can be manufactured in the branch pipe inlet 1a by performing press working from outside the pipe. Further, in the branch pipe 1 of FIG. 18B, the partition wall 5 can be manufactured in the branch pipe inlet portion 1a by using an ERW pipe method in which the partition wall 5 is formed by pressing the copper plate into a tubular shape and then formed into a tubular shape. There is an effect that the processing of the partition wall 5 becomes easy, and the manufacturing cost can be further reduced.

[0035]

As described above, according to the first aspect of the present invention, a plurality of flow paths are provided in a pipe from an inlet to a branch along the direction of gravity when the branch pipe main body is mounted. Since the partition wall is provided, an effect of uniformly dividing the refrigerant can be obtained.

According to the second aspect of the invention, in the vicinity of the inlet, the branch pipe body is arranged along the direction of gravity when the branch pipe main body is attached, and is twisted as approaching the branch. Has a partition wall arranged so as to be perpendicular to the branching direction of the plurality of flow paths, so that the effect of uniformly dividing the refrigerant can be obtained.

According to the third aspect of the present invention, since the partition wall is provided in the linear portion from the entrance to the branch, the effect of reducing the manufacturing cost can be obtained.

According to the fourth aspect of the present invention, since the end of the partition on the inlet side is formed in a wedge shape, the effect of uniformly dividing the refrigerant without increasing the pressure loss on the refrigerant side is obtained. Can be

According to the fifth aspect of the present invention, since the partition wall has a gap near the axis of the pipe, the effect of reducing the manufacturing cost can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a branch pipe according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing coordinate axes of a branch pipe according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a branch pipe according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a pipe cross-sectional distribution of a refrigerant flowing in a heat transfer pipe connecting a branch pipe according to Embodiment 1 of the present invention.

FIG. 5 is a diagram showing another pipe cross-sectional distribution of the refrigerant flowing in the heat transfer pipe connecting the branch pipe according to Embodiment 1 of the present invention.

FIG. 6 is a diagram showing a pipe cross-sectional distribution of a refrigerant at a branch pipe inlet portion of the branch pipe according to the first embodiment of the present invention.

FIG. 7 is a diagram showing another pipe cross-sectional distribution of the refrigerant at the branch pipe inlet of the branch pipe according to Embodiment 1 of the present invention.

FIG. 8 is a diagram showing a refrigerant distribution in a branch pipe according to the first embodiment of the present invention.

FIG. 9 is a perspective view showing another branch pipe according to the first embodiment of the present invention.

FIG. 10 is a perspective view showing another branch pipe according to the first embodiment of the present invention.

FIG. 11 is a perspective view showing another branch pipe according to the first embodiment of the present invention.

FIG. 12 is a perspective view and a sectional view showing another branch pipe according to the first embodiment of the present invention.

FIG. 13 is a perspective view showing another branch pipe according to the first embodiment of the present invention.

FIG. 14 is a perspective view and a sectional view showing a branch pipe according to a second embodiment of the present invention.

FIG. 15 is a diagram showing another pipe cross-sectional distribution of the refrigerant at the branch pipe inlet of the branch pipe according to the second embodiment of the present invention.

FIG. 16 is a diagram showing another pipe cross-sectional distribution of refrigerant at a branch pipe inlet of a branch pipe according to Embodiment 2 of the present invention.

FIG. 17 is a sectional view showing another branch pipe according to the second embodiment of the present invention.

FIG. 18 is a sectional view showing another branch pipe according to the second embodiment of the present invention.

FIG. 19 is a perspective view showing a heat exchanger to which a conventional branch pipe is connected.

FIG. 20 is a perspective view showing a conventional branch pipe.

FIG. 21 is a view showing a state of a refrigerant flowing in a conventional branch pipe.

FIG. 22 is a perspective view showing another conventional branch pipe.

FIG. 23 is a diagram showing a state of a refrigerant flowing in another conventional branch pipe.

[Explanation of symbols]

Reference Signs List 1 branch pipe, 1a branch pipe inlet, 1b, 1c branch pipe outlet, 1d branch pipe connection, 2 U-shaped pipe, 3 heat exchanger, 4 heat transfer pipe, 4a inlet pipe, 4b, 4c outlet pipe, 5 partition , 6 refrigerant flow direction, 7a, 7b, 7c
Gas phase of refrigerant, 8a, 8b, 8c Liquid phase of refrigerant, 9
a, 9b, 9c Refrigerant, 10 Gravity direction, 11 Branch pipe inlet central axis, 12 X axis, 13 Y axis, 14 Z axis,
15 origin, 16 spiral plate, 20 vertical axis passing through pipe center

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kunihiko Kaga, 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Masahiro Nakayama 2-3-2, Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. (72) Inventor Akira Ishibashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 3H019 BA02 BC00

Claims (5)

[Claims] 1. An inlet section through which a fluid flows into a branch pipe main body;
In the branch pipe provided with a branch part for branching the fluid flowing from the inlet part to a plurality of flow paths and a plurality of outlet parts for flowing out the fluid flowing through the branch part, the branch part from the inlet part to the branch part A branch pipe provided in a leading pipe along a direction of gravity in a state where the branch pipe main body is attached and divided into a plurality of flow paths. 2. An inlet section through which fluid flows into the branch pipe main body;
In a branch pipe provided with a branch part for branching the fluid flowing from the inlet part into a plurality of flow paths and a plurality of outlet parts for discharging the fluid flowing through the branch part, in the vicinity of the inlet part, The branch pipe body is arranged along the direction of gravity in the attached state, and is twisted as approaching the branch section, and is arranged near the branch section so as to be perpendicular to the branch direction of the plurality of flow paths. A branch pipe comprising a partition wall as described above. 3. The partition according to claim 1, wherein the partition is provided in a straight line from the entrance to the branch.
The described branch pipe. 4. The branch pipe according to claim 1, wherein an end of the partition wall on the inlet side side has a wedge shape. 5. The branch pipe according to claim 1, wherein the partition has a gap near the axis of the pipe.