JPH05126355A - Refrigerant shunting device of heat exchanger - Google Patents

Abstract

PURPOSE:To provide a refrigerant shunting device of a heat exchanger capable of substantially equally shunting a refrigerant flowing through the heat exchanger. CONSTITUTION:In a refrigerant shunting device 1 of a heat exchanger wherein a bent part 5 is formed on a refrigerant pipe 4 serving to direct a refrigerant into a branch pipe 2, an auxiliary bent part 6 is formed on the refrigerant pipe 4 between the branch pipe 2 and the bent part 5, which part 6 is bent 10 to 30 degree oppositly to the direction of bending of the bent part 5. Accordingly, a refrigerant flowing in a biassed manner along one inner wall of the refrigerant pipe 4 is guided at the auxiliary bent part 6 toward the central side of the same and the refrigerant directed toward the heat exchanger 3 is directed at the branch pipe 2 substantially equally so that heat exchange performance through the heat exchanger 3 is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant distribution device for a heat exchanger incorporated in an air conditioner indoor unit or the like.

[0002]

2. Description of the Related Art A refrigerant distribution device for a heat exchanger incorporated in an indoor unit of an air conditioner is disclosed in Japanese Patent Laid-Open No. 1-55494.

The refrigerant distribution device of this heat exchanger is, for example, as shown in FIG.

Reference numeral 51 is a branch pipe attached to the center of the heat exchanger such as the indoor side for dividing the refrigerant, 52 is a refrigerant pipe for flowing the refrigerant into the branch pipe, and 53 is a bend formed in the refrigerant pipe. Section, this bend is bent about 75 degrees.

[0005]

In the refrigerant distribution device of the heat exchanger, the refrigerant passing through the bent portion 53 easily flows along the inner wall 54 of the refrigerant pipe on the side opposite to the bent direction of the bent portion. The refrigerant was not evenly split in the pipe 51, and the refrigerant was biased to one side of the heat exchanger.

For this reason, the heat exchange performance in the heat exchanger has deteriorated.

The present invention provides a refrigerant flow dividing device for a heat exchanger, which can divide the refrigerant flowing through the heat exchanger substantially equally.

[0008]

According to the present invention, a refrigerant for a heat exchanger is provided in which a branch pipe for diverting the refrigerant is provided in substantially the center of the heat exchanger, and a bent portion is formed in the refrigerant pipe for allowing the refrigerant to flow into the branch pipe. In the flow dividing device, the refrigerant pipe is formed with an auxiliary bending portion bent between the branch pipe and the bending portion in a direction opposite to the bending direction of the bending portion.

[0009]

In the refrigerant distribution device of this heat exchanger, the refrigerant that is biased to one inner wall side of the pipe at the bent portion of the refrigerant pipe is guided to the center side of the refrigerant pipe at the auxiliary bent portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

In FIG. 1 and FIG. 2, 1 is a refrigerant distribution device for a heat exchanger, 2 is a branch pipe provided in the center of the indoor heat exchanger 3, and 4 is a refrigerant pipe connected to this branch pipe. 5,
Is a bent portion formed in the refrigerant pipe and is bent by about 75 degrees.

Reference numeral 6 denotes an auxiliary bending portion formed between the bending portion 5 and the branch pipe 2, and this auxiliary bending portion is bent at an angle θ in a direction opposite to the bending direction of the bending portion 5.

Now, θ is set to 10 degrees.

Reference numeral 7 is a heat transfer tube of the heat exchanger, and 8 is a heat transfer fin.

The heat transfer tube 7, the refrigerant tube 4 and the branch tube 2 are so-called two-minute heat transfer tubes having an outer diameter of 6.35 mm, and the respective dimensions L and M are set to 26.0 mm and 50.0 mm. .

Reference numeral 9 denotes a branch pipe provided in the heat exchanger 3, and 10
Is a refrigerant pipe connected to this branch pipe.

When the heat exchanger 3 is mounted inside the indoor unit body 11 of the separation type air conditioner, the refrigerant tubes 4 and 10 are bent as shown by arrows in FIG.

Then, the auxiliary bending portion 6 also bends in conjunction with each other, and θ becomes about 15 degrees.

As shown in FIG. 3, in the indoor unit main body 11, in addition to the heat exchanger 3, a pre-filter 12, an air cleaning filter 13, a cross flow fan 14, a drain pan 15, vertical blades 16, horizontal blades 17 are provided. Are arranged.

Reference numerals 18 and 19 denote air inlets, and 20 denotes air outlets.

An experiment was conducted on how the refrigerant flows in the refrigerant pipe 4 and the branch pipe 2 in the refrigerant distributor 1 of the heat exchanger configured as described above.

A charge cylinder for supplying a refrigerant is connected to the end 4a of the refrigerant pipe 4 shown in FIG.
A vinyl bag was attached to each of a and 2b, and the refrigerant was caused to flow at the same pressure as the cooling operation for a certain period of time.

Then, by changing the bending angle θ, the end portions 2a,
The weight ratio of the amount of refrigerant in the vinyl bag attached to 2b was investigated.

When the bending angle θ is 0 °, the ends 2a, 2b are
The ratio of the amount of refrigerant flowing through was 30:70.

When the bending angle θ is 10 degrees, the refrigerant amount ratio is 45 to 50:55 to 50, and when θ is 20 degrees, it is 5.
It was 5:45, 60:40 when θ was 30 degrees, and 65:35 when θ was 40 degrees.

It has been found that when the bending angle θ is 10 ° to 30 °, the amounts of the refrigerant flowing in the ends 2a and 2b are almost equal.

Therefore, it was found that θ is preferably 10 degrees to 30 degrees, and the optimum value is 10 degrees.

In this refrigerant distribution device 1, the bending angle θ of the auxiliary bending portion 6 is set to 10 degrees, but the refrigerant pipe 4 is shown in FIG.
When bent like the alternate long and short dash line, the bending angle θ of the auxiliary bending portion 6 becomes about 15 degrees.

Then, a comparison experiment was conducted between the indoor unit 11 incorporating the refrigerant flow dividing device 1 and the indoor unit incorporating the conventional refrigerant flow dividing device in which the bending angle θ was set to 0 degree.

In the cooling operation, use conditions are the same,
When the temperatures of the heat transfer tubes 7a and 7b on the outlet side were measured, the temperatures of the conventional one were 13.0 ° C. and 8.9 ° C., and the refrigerant flowed unevenly in one side.

However, the temperatures of the heat transfer tubes 7a and 7b of the present invention are both 9.3 ° C., there is no difference in temperature between the two, and almost the same amount of the refrigerant flows in the refrigerant passage of the heat exchanger 3. It was confirmed.

Moreover, it was confirmed that the indoor unit 11 incorporating the refrigerant flow dividing device 1 of the present invention has an improved refrigerating capacity of about 3% as compared with the conventional indoor unit incorporating the refrigerant flow dividing device.

As described above, since the refrigerant distribution device 1 for the heat exchanger according to the present invention divides the refrigerant into the heat exchanger 3 almost equally, the heat exchange performance in the heat exchanger 3 can be improved.

[0034]

According to the present invention, in the refrigerant distribution device of the heat exchanger, the refrigerant pipe is provided with an auxiliary bending portion bent between the branch pipe and the bending portion in a direction opposite to the bending direction of the bending portion. Since it is formed, the refrigerant that has been deflected to one inner wall side of the pipe at the bent portion of the refrigerant pipe is guided to the center side of the refrigerant pipe at the auxiliary bent portion, and the refrigerant to the heat exchanger is diverted almost equally in the branch pipe. Therefore, the heat exchange performance in the heat exchanger can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a refrigerant distribution device for a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a refrigerant distribution device of the heat exchanger.

FIG. 3 is a cross-sectional view of an indoor unit of an air conditioner in which the refrigerant flow dividing device of the heat exchanger is incorporated.

FIG. 4 is a cross-sectional view of a main part of a conventional refrigerant distribution device for a heat exchanger.

[Explanation of symbols]

 1 Refrigerant distribution device of heat exchanger 2 Branch pipe 4 Refrigerant pipe 5 Bent portion 6 Auxiliary bend portion

Claims (1)

[Claims] 1. A refrigerant distribution device for a heat exchanger, wherein a branch pipe for diverting the refrigerant is provided substantially in the center of the heat exchanger, and a bent portion is formed in the refrigerant pipe for letting the refrigerant flow into the branch pipe.
A refrigerant distribution device for a heat exchanger, wherein the refrigerant pipe has an auxiliary bending portion formed between the branch pipe and the bending portion, the auxiliary bending portion being bent in a direction opposite to a bending direction of the bending portion.