JP2000088484A - Heat exchanger for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent heat exchanging quantity from lowering by enhancing drainage of condensate produced at the time of heat exchange. SOLUTION: The heat exchanger for air conditioner comprises a plurality of heating tubes 1 arrange at least in one row, spiral thin wire fins 2a meshed with the heating tubes 1, and headers provided at the opposite ends of the heating tube 1 wherein the thin wire fin 2a is wound to form an ellipse having aspect ratio C/D of 3/5 or above. The heating tube 1 employs an extremely thin pipe having outside diameter of 1-2 mm and inside diameter of 0.7-1.7 mm, for example, and the thin wire fin 2a employs a wire having diameter of 0.1-0.5 mm. Pitch of the thin wire fin 2a is 0.3-1.5 mm and the pitch of the heating tube 1 is 3-6 mm which is wider than the diameter thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat exchanger used for an air conditioner or the like.

[0002]

2. Description of the Related Art FIG.
0 front view of the heat exchanger for an air conditioner disclosed in Japanese Patent Publication No. 0,
FIG. 13 is an enlarged front view of the heat transfer surface. In the drawing, 1 is a heat transfer tube, 2 is a fine wire fin, and spiral fine wire fins 1 are woven in a mesh shape. Moreover, in this conventional heat exchanger, the heat transfer tube 1 and the fine wire fin 2 are joined.

As the heat transfer tube 1, for example, an ultrafine pipe having an outer diameter of φ1 to 2 mm and an inner diameter of φ0.7 to 1.7 mm is used, and a wire having a diameter of φ0.1 to 0.5 mm is used as the fine wire fin 2. ing. The pitch A of the fine wire fins 2 is about 0.3 to 1.5 mm, and the pitch B of the heat transfer tubes 1 is about 3 to 6 mm. Headers 4 a and 4 b are joined to both ends of the heat transfer tube 1. Further, pipes 5a and 5b for flowing a heat exchange fluid such as a refrigerant through the heat exchanger are connected to the respective headers 4a and 4b.

Next, heat exchange between the cooling fluid and air will be described with reference to FIG. First, when the heat exchanger is used as a condenser, when a low-temperature heat exchange fluid such as a refrigerant flows into the header 4a from the pipe 5a, the heat exchange fluid is supplied to the plurality of heat transfer tubes 1 connected to the header 4a. The airflow flowing through the heat exchanger and passing through the heat exchanger is cooled, whereby cooling can be performed. At this time, when the air near the surfaces of the heat transfer tubes 1 and the fine wire fins 2 is cooled below the dew point, dew condensation occurs on the surfaces of the heat transfer tubes 1 and the fine wire fins 2 as shown in FIG. The water is drained along the surface and the surface of the fine wire fin 2. The heat-exchanged heat exchange fluid flows into the header 4b, is collected, and flows out from the pipe 5b.

[0005]

Since the conventional heat exchanger for an air conditioner is constructed as described above, if the air near the surfaces of the heat transfer tubes 1 and the fine wire fins 2 is cooled below the dew point, it is difficult to achieve the following. As shown at 15, dew condensation occurs on the surfaces of the heat transfer tubes 1 and the fine wire fins 2. The thin wire fins 2 are angled with respect to the horizontal so that the gravity of the dew condensation water 3 drains the surface of the heat transfer tube 1 and the surface of the thin wire fins 2 as shown in FIG. , C to D of fine wire fin 2
If the size is not sufficient, the dew condensation water 3 which has condensed as shown in FIG. 15 is held between the fine wire fins 2 and between the fine wire fins 2 and the heat transfer 1 by surface tension. Therefore, the resistance to the airflow passing through the heat exchanger increases, and the amount of the passing airflow decreases. Therefore, there was a problem that the heat exchange amount was reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a heat exchanger capable of improving the drainage of dew water generated during heat exchange and preventing a decrease in the amount of heat exchange. With the goal.

[0007]

A heat exchanger for an air conditioner according to the present invention comprises a plurality of heat transfer tubes arranged in at least one row, and spiral thin wire fins meshed with the heat transfer tubes. , And headers provided at both ends of the heat transfer tube, and the fine wire fin is wound so that the aspect ratio C / D is an ellipse of 3/5 or more.

The heat transfer tube includes a plurality of heat transfer tubes arranged in at least one row, a spiral thin wire fin combined with the heat transfer tube in a mesh shape, and headers provided at both ends of the heat transfer tube. , Wound in a circular shape.

The heat transfer tube includes a plurality of heat transfer tubes arranged in at least one row, spiral thin wire fins combined with the heat transfer tubes in a mesh, and headers provided at both ends of the heat transfer tubes. , Wound into a diamond shape.

[0010] The corners of the rhombus are rounded.

[0011] Further, the method of winding the spiral thin wire fins is deformed along the heat transfer tube.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the heat exchanger according to Embodiment 1, and FIG. 2 is an enlarged front view of the heat transfer surface. In the figure, 1 is a heat transfer tube, 2
Is a fine wire fin, which is woven in a mesh shape through a heat transfer tube 1 on a spiral fine wire fin 2. In the heat exchanger according to the first embodiment, the heat transfer tube 1 and the fine wire fin 2 are joined by brazing or the like.

As the heat transfer tube 1, for example, an ultrafine pipe having an outer diameter of φ1 to 2 mm and an inner diameter of φ0.7 to 1.7 mm is used, and as the fine wire fin 2, a wire having a diameter of φ0.1 to 0.5 mm is used. ing. The pitch A of the fine wire fins 2 is about 0.3 to 1.5 mm, and the pitch B of the heat transfer tubes 1 is wider than the diameter of the heat transfer tubes 1 and is about 3 to 6 mm. Headers 4 at both ends of heat transfer tube 1
a and 4b are joined. Further, pipes 5a and 5b for flowing a heat exchange fluid such as a refrigerant through the heat exchanger are connected to the respective headers 4a and 4b.

FIG. 3 is a bottom view of FIG. 2, and FIG. 4 is a partial view of one pitch taken from FIG. A thin wire fin 2 is combined with the heat transfer tube 1, and the thin wire fin 2a is wound so as to form an ellipse having an aspect ratio C / D of 3/5 or more as shown in FIG.

Next, the operation will be described. The heat exchange fluid flows inside the plurality of heat transfer tubes 1 and cools the airflow passing through the heat exchanger, thereby performing cooling. At this time, if the air near the surfaces of the heat transfer tubes 1 and the fine wire fins 2 is cooled below the dew point, dew condensation occurs on the surfaces of the heat transfer tubes 1 and the fine wire fins 2. At this time, since the fine wire fins 2 are angled as shown in FIG. 2, the dew condensation water 3 generated on the fine wire fins travels along the fine wire fins by gravity and flows toward the heat transfer space 1. However, when the amount of dew water generated increases, in the conventional heat exchanger, as shown in FIG. 16 and FIG.
If C is small, that is, C is narrow, the dew water is retained due to the surface tension of the dew water, resulting in the dew water 3a and 3b shown in FIG. However, in the present embodiment, as shown in FIG.
Is 3/5 or more, so that the fine fins 2
The interval is widened, and it becomes difficult to hold the dew condensation water 3 due to the surface tension. Therefore, drainage can be improved, and an increase in resistance of the passing airflow can be prevented.

Further, the present heat exchanger is used not only in one row but also in a plurality of rows as shown in FIG. In that case, if the line fins 2 do not touch
Since there is little effect on performance, 1.5 times the width of the fine wire fin 2 (F / E =
1.5) The above is assumed. Therefore, even when the winding method of the fine wire fins 2 is the same as in the present embodiment, the fins do not touch each other.

Further, since the winding method of the thin wire fins 2 is an ellipse having a larger aspect ratio than that of the conventional heat exchanger, the surface area of the thin wire fins 2 is increased, thereby increasing the area for heat exchange with the passing airflow. And the heat exchange processing capacity can be increased. Conversely, if the area for heat exchange with the airflow is made equal, the gap between the fine wire fins 2 or the gap between the heat transfer tubes 1 can be increased, the resistance of the airflow can be reduced, and more airflow can flow. Such a method can also increase the heat exchange capacity.

When the fluid to be subjected to heat exchange is applied not only to air but also to liquids such as water and oil, the resistance when passing through the heat exchanger becomes greater than that of gas. In the present embodiment, the winding of the fine wire fins 2 is an ellipse having an aspect ratio larger than that of the conventional heat exchanger, so that the gap between the fine wire fins 2 or the gap between the heat transfer tubes 1 can be increased. , The heat exchange capacity can be increased.

Further, the heat exchanger of the present embodiment is assembled by combining spiral thin wires and passing the heat transfer tube 1 through the gap. If the gap is small, insertion of the heat transfer tube 1 becomes difficult. In the present embodiment, since the time can be widened,
Insertion of the heat transfer tube 1 becomes easy, and productivity can be improved.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a bottom view of the heat transfer surface of the heat exchanger for an air conditioner according to the second embodiment.
FIG. 7 is a partial view of one pitch taken from FIG. The heat transfer tube 1 is combined with the thin wire fin 2b, and the thin wire fin 2a is wound so as to form a circle of C = D as shown in FIG.
As shown in FIG. 7, the amount of dew water 3 retained is reduced and the first embodiment is performed.
The same effect can be obtained.

The heat exchanger of the present invention is designed to be used not only in one row but also in a plurality of rows. In this case, if the fine line fins do not touch, there is little effect on the performance. Therefore, in consideration of the compactness and the installation method, the width of the line is assumed to be 1.5 times or more the width of the fine line fins. Therefore, even when the winding method of the thin wire fin is the same as in the present embodiment, the fins do not touch each other.

Further, since the winding method of the thin wire fins 2b is a circle as compared with the conventional heat exchanger, the surface area of the thin wire fins is increased accordingly, and the area for exchanging heat with the passing airflow can be increased. Heat exchange capacity can be increased. Conversely, if the areas that exchange heat with the airflow are equal,
Since the gap between the fine wire fins 2 or the gap between the heat transfer tubes 1 can be increased, the airflow resistance can be reduced, and more airflow can flow, so that even such a method can increase the heat exchange processing capacity. it can.

The fluid to be subjected to heat exchange is not only air, but also water,
When applied to liquids such as oil, the resistance through the heat exchanger is greater than that of gas. In the present embodiment, since the winding of the fine wire fins 2 is circular, the gap between the fine wire fins 2 or the gap between the heat transfer tubes 1 can be increased.
Since the resistance of the fluid can be reduced, the heat exchange processing capacity can be increased.

The heat exchanger of the present embodiment is assembled by combining spiral thin wires and passing the heat transfer tube 1 through the gap, but if the gap is small, it becomes difficult to insert the heat transfer tube 1. In the embodiment, since the gap is widened, the insertion of the heat transfer space 1 is facilitated, and the productivity can be improved.

Embodiment 3 Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a bottom view of the heat transfer surface of the heat exchanger for an air conditioner according to the third embodiment, and FIG. The heat transfer tube 1 is combined with the thin wire fins 2c, and is scattered in a diamond shape with rounded corners as shown in FIG. 9, and as shown in FIG. The same effect can be obtained.

The heat exchanger is not only used in one row but also in a plurality of rows. In this case, if the fine line fins do not touch, there is little effect on the performance. Therefore, in consideration of the compactness and the installation method, the width of the line is assumed to be 1.5 times or more the width of the fine line fins. Therefore, even when the winding method of the thin wire fin is the same as in the present embodiment, the fins do not touch each other.

Further, since the winding of the fine wire fin 2b has a shape in which the corners of the diamond are rounded as compared with FIG. 16, the surface area of the fine wire fin is increased, and the area for heat exchange with the passing airflow is increased. And the heat exchange processing capacity can be increased. Conversely, if the area for heat exchange with the air flow is made equal, the gap between the fine wire fins 2 or the heat transfer tube 1
Can be increased, the resistance of the airflow can be reduced, and more airflow can flow, so that even such a method can increase the heat exchange capacity.

The fluid to be subjected to heat exchange is not only air, but also water,
When applied to liquids such as oil, the resistance through the heat exchanger is greater than that of gas. In the present embodiment, the winding of the thin wire fins 2 has a rounded diamond shape, so the gap between the thin wire fins 2 or the gap between the heat transfer tubes 1 can be increased, and the resistance of the fluid can be reduced. Therefore, the heat exchange processing capacity can be improved.

Further, the heat exchanger of the present embodiment is assembled by combining spiral thin wires and passing the heat transfer tube through the gap. If the gap is small, it becomes difficult to insert the heat transfer tube. In this case, the gap can be widened, so that the insertion between the heat transfers becomes easy, and the productivity can be improved.

Embodiment 4 Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 10 shows a fourth embodiment.
FIG. 11 is a bottom view of the heat transfer surface of the heat exchanger for an air conditioner, and FIG. Heat transfer tube 1
Is combined with a thin wire fin 2d, as shown in FIG.
From the shapes of the first and second embodiments, the fine wire fin 2d
The joint between the heat transfer tube 1 and the heat transfer tube 1 is pressed against the heat transfer tube 1 by a jig and deformed.

As shown in FIG. 11, the retained amount of the dew condensation water 3 is reduced and the drainage performance is the same as in the first to third embodiments. However, since the number of joints between the heat transfer tube 1 and the fine wire fin is increased, Since the heat transfer coefficient of both is improved, the heat exchange processing capacity can be further increased.

The heat exchanger of the present invention is designed to be used not only in one row but also in a plurality of rows. In this case, if the fine line fins do not touch, there is little effect on the performance. Therefore, in consideration of the compactness and the installation method, the width of the line is assumed to be 1.5 times or more the width of the fine line fins. Therefore, even when the winding method of the thin wire fin is the same as in the present embodiment, the fins do not touch each other.

Further, the winding method of the fine wire fin 2b is the same as that of the first and second embodiments, and the joint between the fine wire fin 2d and the heat transfer tube 1 is pressed by a jig and deformed along the heat transfer tube 1. As a result, the surface area of the thin wire fins increases accordingly, the area for heat exchange with the passing airflow can be increased, and the heat exchange processing capacity can be increased. Conversely, if the area for heat exchange with the airflow is made equal, the gap between the fine wire fins 2 or the gap between the heat transfer tubes 1 can be increased, the resistance of the airflow can be reduced, and more airflow can flow. Such a method can also increase the heat exchange capacity.

The fluid to be subjected to heat exchange is not only air, but also water,
When applied to liquids such as oil, the resistance through the heat exchanger is greater than that of gas. In this embodiment, the thin wire fin 2d and the heat transfer tube 1 are different from the shapes of the first and second embodiments.
Of the heat transfer tube 1 is pressed against the heat transfer tube 1 by a jig and deformed, so that the gap between the thin wire fins 2 or the gap between the heat transfer tubes 1 can be increased, and the resistance of the fluid is reduced. Therefore, the heat exchange processing capacity can be increased.

[0035]

The heat exchanger for an air conditioner according to the present invention has a plurality of heat transfer tubes arranged in at least one row, a spiral thin wire fin combined with the heat transfer tubes in a mesh shape, and a heat transfer tube. With headers provided at both ends, the fine wire fins are wound so that the aspect ratio C / D becomes an ellipse of 3/5 or more, so drainage is improved, and the pressure of air passing therethrough By reducing the loss, a high-performance heat exchanger can be obtained.

Further, since the fine wire fin is wound in a circular shape, the drainage property is improved, and the pressure loss of the air passing therethrough is reduced, so that a high-performance heat exchanger can be obtained. .

Further, since the fine wire fins are wound so as to form a rhombus, the drainage property is improved, and the pressure loss of the air passing therethrough is reduced, so that a high-performance heat exchanger can be obtained. .

Also, by making the corners of the diamond round,
Further, the drainage performance is improved, and the pressure loss of the air passing therethrough is reduced, so that a high-performance heat exchanger can be obtained.

Further, since the spiral winding of the thin wire fins is deformed in conformity with the heat transfer tube, the number of joints between the heat transfer tube and the thin wire fins is increased, and the heat transfer coefficient between the two is improved. The exchange processing capacity can be further increased.

[Brief description of the drawings]

FIG. 1 is a front view showing a space between a fin portion and heat transfer of a heat exchanger according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged front view showing a space between a fin portion and heat transfer of the heat exchanger according to the first embodiment.

FIG. 3 is a bottom view showing a space between a fin portion and heat transfer of the heat exchanger according to the first embodiment.

FIG. 4 is a partial view showing a space between a fin portion and heat transfer of the heat exchanger according to the first embodiment.

FIG. 5 is a bottom view showing a space between a fin portion and heat transfer of the heat exchanger according to the first embodiment.

FIG. 6 is a bottom view showing a space between a fin portion and heat transfer of the heat exchanger according to the second embodiment.

FIG. 7 is a partial view showing a space between a fin portion and heat transfer of a heat exchanger according to a second embodiment.

FIG. 8 is a bottom view showing a space between a fin portion and heat transfer of a heat exchanger according to a third embodiment.

FIG. 9 is a partial view showing a space between a fin portion and heat transfer of a heat exchanger according to a third embodiment.

FIG. 10 is a bottom view showing a space between a fin portion and heat transfer of a heat exchanger according to a fourth embodiment.

FIG. 11 is a partial view showing a space between a fin portion and heat transfer of a heat exchanger according to a fourth embodiment.

FIG. 12 is a front view of a heat exchanger for an air conditioner using a conventional ultrafine tube.

FIG. 13 is a front view showing a fin portion and a heat transfer tube portion of a heat exchanger for an air conditioner using a conventional ultrafine tube.

FIG. 14 is a bottom view showing a fin portion and a heat transfer tube portion of a heat exchanger for an air conditioner using a conventional ultrafine tube.

FIG. 15 is a front view showing how a conventional heat exchanger for an air conditioner using ultrafine tubes forms dew water.

FIG. 16 is a partial view showing a fin portion and a heat transfer tube portion of a conventional heat exchanger for an air conditioner using a fine tube.

FIG. 17 is a partial view showing a fin portion and a heat transfer tube portion of a heat exchanger for an air conditioner using a conventional ultrafine tube.

[Explanation of symbols]

1 Heat transfer tube, 2 Fine wire fin, 3 Condensation water, 4 Header, 5 piping.

Claims (5)

[Claims] 1. A heat transfer tube comprising: a plurality of heat transfer tubes arranged in at least one row; spiral thin wire fins meshed with the heat transfer tubes; and headers provided at both ends of the heat transfer tubes. The heat exchanger for an air conditioner, wherein the fine wire fins are wound so that the aspect ratio C / D is an ellipse of 3/5 or more. 2. A heat transfer pipe comprising: a plurality of heat transfer tubes arranged in at least one row; a spiral thin wire fin combined with the heat transfer tubes in a mesh form; and headers provided at both ends of the heat transfer tubes. The heat exchanger for an air conditioner, wherein the fine wire fin is wound in a circular shape. 3. A heat transfer tube comprising: a plurality of heat transfer tubes arranged in at least one row; a spiral thin wire fin combined with the heat transfer tubes in a mesh form; and headers provided at both ends of the heat transfer tubes. The heat exchanger for an air conditioner, wherein the fine wire fins are wound in a diamond shape. 4. The heat exchanger for an air conditioner according to claim 3, wherein the diamond has rounded corners. 5. The heat exchanger for an air conditioner according to claim 1, wherein the spiral thin wire fins are deformed in a manner of being wound along the heat transfer tube. .