JP3036929B2 - Refrigerant flow divider for heat exchanger - Google Patents

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 indoor unit of an air conditioner.

[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 Application Laid-Open No. 1-55494.

[0003] The refrigerant distribution device of this heat exchanger is, for example, as shown in FIG.

Reference numeral 51 denotes a branch pipe which is mounted substantially at the center of the heat exchanger such as an indoor side and diverts the refrigerant, 52 denotes a refrigerant pipe through which the refrigerant flows into the branch pipe, and 53 denotes a bend formed in the refrigerant pipe. In the 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 is likely to flow along the refrigerant pipe inner wall 54 on the side opposite to the direction in which the bent portion is bent. The refrigerant was not uniformly divided by the pipe 51, and the refrigerant was unevenly flowing to one side of the heat exchanger.

Therefore, the heat exchange performance of the heat exchanger has been reduced.

[0007] The present invention provides a refrigerant distribution device for a heat exchanger, which can divide the refrigerant flowing through the heat exchanger almost equally.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a refrigerant for a heat exchanger in which a branch pipe for dividing a refrigerant is provided substantially at the center of a heat exchanger, and a bent portion is formed in the refrigerant pipe for flowing the refrigerant into the branch pipe. In the flow dividing device, the refrigerant pipe has an auxiliary bend formed between the branch pipe and the bend in a direction opposite to a direction in which the bend is bent.

[0009]

In the refrigerant distribution device of this heat exchanger, the refrigerant that has drifted toward one inner wall of the refrigerant tube at the bent portion of the refrigerant tube is guided to the center of the refrigerant tube at the auxiliary bent portion.

[0010]

An embodiment of the present invention will be described with reference to the drawings.

1 and 2, reference numeral 1 denotes a refrigerant distribution device for a heat exchanger, 2 denotes a branch pipe provided substantially at the center of a heat exchanger 3 on the indoor side, and 4 denotes a refrigerant pipe connected to the branch pipe. , 5
Is a bent portion formed in the refrigerant pipe, which is bent about 75 degrees.

Reference numeral 6 denotes an auxiliary bending portion formed between the bending portion 5 and the branch pipe 2, and the 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 denotes a heat transfer tube of the heat exchanger, and reference numeral 8 denotes a heat transfer fin.

The heat transfer tube 7, the refrigerant tube 4 and the branch tube 2 are so-called 2-minute heat transfer tubes having an outer diameter of 6.35 mm, and the 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;
Is a refrigerant pipe connected to this branch pipe.

When the heat exchanger 3 is mounted in the indoor unit main 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 section 6 also bends in conjunction with it, 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, a vertical blade 16, and a horizontal blade 17 are provided. Is arranged.

Reference numerals 18 and 19 are air inlets, and reference numeral 20 is an air outlet.

An experiment was conducted on how the refrigerant flows through the refrigerant pipe 4 and the branch pipe 2 with the refrigerant flow dividing device 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 plastic bag was attached to each of a and 2b, and a refrigerant was allowed to flow at the same pressure as in 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 plastic bag attached to 2b was investigated.

When the bending angle θ is 0 degree, the ends 2a, 2b
Was 30:70.

When the bending angle θ is 10 degrees, the ratio of the refrigerant amount is 45 to 50:55 to 50, and when the bending angle θ is
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 from 10 degrees to 30 degrees, the amount of the refrigerant flowing through the ends 2a and 2b becomes substantially equal.

For this reason, it has been found that θ is preferably 10 degrees to 30 degrees, and the optimum is 10 degrees.

In the refrigerant distribution device 1, the bending angle θ of the auxiliary bending portion 6 is set to 10 degrees.
When the bending is performed as shown by the dashed line, the bending angle θ of the auxiliary bending portion 6 becomes about 15 degrees.

A comparison experiment was conducted between the indoor unit 11 incorporating the refrigerant distribution device 1 and an indoor unit incorporating the conventional refrigerant distribution device in which the bending angle θ was set to 0 °.

During 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 heat transfer tubes were 13.0 ° C. and 8.9 ° C., and the refrigerant flowed in one direction.

However, the temperatures of the heat transfer tubes 7a and 7b of the present invention are both 9.3 ° C., and there is no difference between the temperatures, and a substantially equal amount of refrigerant flows in the refrigerant flow path of the heat exchanger 3. It was confirmed that.

In addition, it was confirmed that the indoor unit 11 incorporating the refrigerant distribution device 1 of the present invention was improved in refrigerating capacity by about 3% as compared with the indoor unit incorporating the conventional refrigerant distribution device.

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

[0034]

According to the present invention, in a refrigerant distribution device for a heat exchanger, an auxiliary bending portion bent in a direction opposite to the bending direction of the bent portion is provided between the branch tube and the bent portion in the refrigerant pipe. Since the refrigerant is formed, the refrigerant which is deflected to one inner wall side of the refrigerant 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 almost equally divided at the branch pipe. Therefore, the heat exchange performance of the heat exchanger can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a refrigerant distribution device of a heat exchanger showing one embodiment of the present invention.

FIG. 2 is a 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 the air conditioner incorporating the refrigerant distribution device of the heat exchanger.

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

[Description of Signs] 1 Refrigerant distribution device for heat exchanger 2 Branch pipe 4 Refrigerant pipe 5 Bent section 6 Auxiliary bend section

Claims (1)

(57) [Claims] A refrigerant distribution device for a heat exchanger, wherein a branch pipe for dividing a refrigerant is provided substantially at the center of a heat exchanger, and a bent portion is formed in the refrigerant pipe for flowing the refrigerant into the branch pipe.
A refrigerant distribution device for a heat exchanger, wherein an auxiliary bending portion bent in a direction opposite to a bending direction of the bending portion is formed between the branch pipe and the bending portion in the refrigerant tube.