JPH11264689A - Outdoor unit for air conditioner and method for manufacturing heat exchanger used therefor - Google Patents

Abstract

(57) [Problem] To provide an outdoor unit of an air conditioner equipped with a heat exchanger excellent in heat transfer performance, which can prevent frost from being concentrated on the fin front edge. SOLUTION: A heat exchanger row having a plurality of heat transfer tubes 1 and fins 3 independently provided in a row of heat transfer tubes is connected to an outside air flow direction 7.
Side by side. Further, a cutting line 12a is formed at the fin front edge 11a in front of the heat transfer tube 1a in at least the first row of the heat exchanger row. This cutting line 12a blocks heat conduction between the heat transfer tube 1a and the fin front edge, and prevents frost from being concentrated on the fin front edge 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor unit of an air conditioner having a heat exchanger for exchanging heat between outside air and circulating refrigerant, and a method of manufacturing a heat exchanger used for the outdoor unit of the air conditioner. It is about.

[0002]

2. Description of the Related Art In a heating operation in winter, for example, a heat exchanger mounted on an outdoor unit of a heat pump type air conditioner acts as an evaporator. FIG. 21 is an explanatory view showing the state of frost formation on a heat exchanger of a conventional outdoor unit, wherein 1 is a heat transfer tube, 3 is a flat fin having a long flat plate shape, 7 is a flow direction of an air flow, and 11 is a fin. The leading edge 15 is frost adhering to the heat exchanger. A plurality of fins 3 are arranged in parallel, and a plurality of heat transfer tubes 1 penetrate the fins 3 at predetermined intervals in a vertical direction. The heat transfer medium is circulated in the heat transfer tube 1, and outside air flows in from the flow direction 7. The heat transfer tubes 1 and the fins 3 are cooled by heat conduction from the heat transfer medium, and heat is exchanged between the heat transfer tubes 1 and the fins 3 and the airflow.

In the case where the heat exchanger having the above-described configuration is mounted on the outdoor unit of a conventional air conditioner, if the temperature of the fins 3 of the heat exchanger becomes 0 ° C. or less, the fins 3 are contained in the air. The water vapor adheres to the heat exchanger as frost 15. Frost 15
When adhered to the heat exchanger, it becomes a ventilation resistance, the flow rate of the inflowing outside air decreases, and the heat exchange performance decreases. Occasionally, the flow may be blocked and the operation as an air conditioner may not be possible. As shown in FIG. 21, the frost formation state is the fastest in the fin front edge 11 where the temperature difference between the inflow outside air and the fin surface is large.

[0004] In order to cope with such a problem, for example, the one disclosed in Japanese Patent Application Laid-Open No. Hei 9-159212 is configured to prevent frost formation on the fin front edge 11 as described above. FIG. 22 shows the configuration of this heat exchanger. FIG. 22 is a partial cross-sectional view showing a conventional heat exchanger. In the figure, reference numeral 16 denotes a heat insulating cut line having a predetermined width and a predetermined length provided on the fin front edge portion 11 and maintaining a predetermined interval. A plurality of lines are formed to form a substantially one line cut gap as a whole. By forming the heat-insulating cut line 16 in the fin front edge 11, the heat transfer coefficient of the fin front edge 11 is reduced, the temperature is increased, and frost formation is reduced.

[0005]

In an outdoor unit of an air conditioner equipped with the above-described heat exchanger, the amount of frost formed on the fin front edge 11 of the heat exchanger is reduced. However, in the configuration of FIG. 22, the heat exchanger is formed by the heat transfer tubes 1 in a plurality of rows, and the fins 3 are connected to the flow direction 7 of the outside air over the plurality of rows of the heat transfer tubes. For this reason, a temperature boundary layer is formed in the outside airflow flowing between the fins 3, and the temperature boundary layer grows particularly in the leeward portion, so that the heat transfer coefficient is greatly reduced, and an outdoor unit having high heat exchange performance is required. It was difficult to do.

The present invention has been made to solve such a problem, and an outdoor unit of an air conditioner which can prevent frost from concentrating locally and has excellent heat exchange performance is obtained. The purpose is to: It is still another object of the present invention to provide a method for manufacturing a heat exchanger that can prevent frost formation from concentrating locally and that can easily manufacture a heat exchanger having excellent heat exchange performance.

[0007]

An outdoor unit of an air conditioner according to the present invention is provided with a finned heat exchanger for exchanging heat between circulating refrigerant and outside air. A plurality of heat transfer tubes arranged side by side in the outside air inflow direction;
A plurality of fins are provided independently for each row of the heat transfer tubes and penetrate through the heat transfer tubes, and a cutting line is provided at a front edge of the fin in front of the heat transfer tubes.

[0008] In the outdoor unit of the air conditioner according to the present invention, the cutting line is provided so as to block heat conduction between the heat transfer tube and the leading edge of the fin.

In the outdoor unit of the air conditioner according to the present invention, the width L1 of the fin is longer than the step pitch L3 of the heat transfer tubes.

Further, in the outdoor unit of the air conditioner according to the present invention, the cutting line may be formed only at the front edge of the fin with respect to the row of heat transfer pipes arranged at the most upstream side in the outside air inflow direction among the plurality of rows of heat transfer pipes. It is provided in.

Further, in the outdoor unit of the air conditioner according to the present invention, the cutting line is formed by a plurality of rows of heat transfer tubes including a row of heat transfer tubes arranged at the most upstream side in the outside air inflow direction among the plurality of rows of heat transfer tubes. It is provided at the fin front edge for each heat tube.

In the outdoor unit of the air conditioner according to the present invention, at least a portion of the fin where no cutting line is formed has irregularities.

Further, according to the method of manufacturing a heat exchanger used for an outdoor unit of an air conditioner according to the present invention, a step of forming a cutting line at least on a fin arranged at the most upstream side in an inflow direction of outside air; Pressing a portion of the fin on which the cutting line is formed so as to suppress displacement of the fins on both sides of the cutting line after forming the line; and inserting a heat transfer tube into the fin to form the fin and the heat transfer tube. And a step of joining them.

Further, a method of manufacturing a heat exchanger for use in an outdoor unit of an air conditioner according to the present invention includes a step of forming a cutting line at least on a fin arranged at the most upstream side in an inflow direction of outside air; Forming a heat exchanger row by inserting heat transfer tubes into the fins and the heat transfer pipes, and simultaneously bending a plurality of the heat exchanger rows. .

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A heat exchanger for an outdoor unit of an air conditioner according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a heat exchanger mounted on an outdoor unit of the air conditioner according to Embodiment 1. FIG. 2 is a diagram showing one row portion of a plurality of rows of the heat exchanger shown in FIG. 1, FIG. 2 (a) is an overall perspective view, and FIG. 2 (b) is a dotted line portion in FIG. 2 (a). FIG. In the figure, 1 is a heat transfer tube through which a refrigerant flows, 2 is a side plate connecting one end of a plurality of rows of heat exchangers, 3 is a fin attached to the heat transfer tube 1, for example, a flat fin, and 8 is a heat exchange tube. It is a vessel.
One row of heat exchanger tubes 1 and one row of fins 3 constitute one heat exchanger row.

A heat transfer tube 1 penetrates a plurality of vertically long fins 3 arranged at predetermined intervals in the x-direction substantially perpendicularly to the surface of the fins 3. A plurality of heat transfer tubes 1 are arranged in parallel in a plurality of stages, for example, ten stages in the figure, at predetermined intervals in the z direction. The spacing between the fins 3 in the x direction is, for example, a little less than 1 mm to several mm. Further, the interval between the heat transfer tubes 1 constituting one row, that is, the step pitch L3 in the z direction is, for example, about 20 mm to about 30 mm. As shown in FIG. 1, the heat exchanger row shown in FIG.
In this case, a plurality of rows, for example, three rows are arranged, and the heat transfer tubes 1 are connected to each other at the ends in the x direction by pipes to form an integrated heat exchanger 8.

As shown in FIG. 1, if one end of the heat exchanger row is aligned and the rows are connected by the side plate 2, it is easy to handle as an integrated product, and the manufacturing operation becomes easy. Although FIG. 1 shows an example in which three heat exchanger rows are provided in the y direction, there may be two rows or four or more rows. The plurality of heat exchanger rows are arranged with a gap of about several millimeters or the end of each fin. In addition, the heat transfer tubes 1 of each heat exchanger row are shifted in the z direction so as to correspond to the upper and lower spaces of the heat exchanger tubes 1 of the adjacent heat exchanger row, and are arranged in a staggered manner. High heat exchange efficiency with

FIGS. 3 and 4 show the configuration of the outdoor unit of the air conditioner according to the present embodiment. FIG. 3 is an external perspective view showing an outdoor unit of the air conditioner, and FIG. 4 is a plan view showing the outdoor unit. In the figure, 4 is the box of the outdoor unit of the air conditioner,
5 is an outside air suction surface, 6 is an outside air blowing surface, 7 is an outside air flow direction, 8 is a heat exchanger, 9 is a blower, and 10 is a compressor.

The outdoor unit is equipped with a heat exchanger 8, a blower 9, a compressor 10 and the like which constitute a part of a refrigeration cycle. As the blower 9, for example, an axial blower is used in FIG. 4, but other than that, a mixed flow blower, a cross flow blower, a centrifugal blower, or the like is used.

The outside air of, for example, about 2 ° C. taken in from the outside air flow direction 7 by the blower 9 is supplied to the heat exchanger 8 provided on the outside air suction surface 5 of the box 4 of the outdoor unit by the heat exchanger tube 1.
It exchanges heat with the refrigerant flowing inside, is cooled to, for example, about -5 ° C., and is blown out from the outside air blowing surface 6. The compressor 10 is for generating power for circulating the refrigerant in the heat transfer tube 1, and may not be provided inside the unit when a plurality of outdoor units are connected.

Next, the detailed configuration of the fin 3 will be described. FIG. 5 is a partial sectional view showing the heat exchanger, and FIG. 6 is a partial top view of the heat exchanger. In the figure, 12a is a fin 3a
It is a cutting line formed at The vicinity of the windward end of the fin 3a with respect to the outside air flow direction 7 is defined as a fin front edge 11.
a, the vicinity of the leeward end is referred to as a fin rear edge, and referred to as forward toward the upstream side.

When the outside air taken into the outdoor unit by the blower passes through the heat exchanger, heat is exchanged between the circulating refrigerant flowing through the heat transfer tube 1 via the heat transfer tube 1 and the fins 3 and the outside air. For convenience of explanation, each of the heat exchanger rows is referred to as a first row, a second row, and a third row in order from the windward side. Also, 3
a is the first row fin, 3b is the second row fin, 3c is 3
In the first row, 1a is the first row of heat transfer tubes, 3b is the second row of heat transfer pipes, and 3c is the third row of heat transfer pipes. , Fins 3
It is written. The same applies to the fin front edges 11a, 11b, 11c and the cutting lines 12a, 12b, 12c. Airflow
When contacting the first row of fins 3a, for example, the heat transfer tube 1
Has a refrigerant temperature of about −5 ° C., an airflow temperature of about 2 ° C.,
The temperature difference between the fin 3a and the airflow is large. However, the second row,
The heat is exchanged between the fins 3 and the airflow toward the third row and downstream, and the temperature difference between the fins 3 and the airflow decreases.
Further, the temperature boundary layer formed in the air flow along the fins 3 grows thinner on the upstream side and gradually thicker toward the downstream side. Due to the contribution of both the temperature difference between the fins and the airflow and the temperature boundary layer, the heat flow velocity is high on the upstream side and low on the downstream side.

However, in the heat exchanger mounted on the outdoor unit according to the present embodiment, the fins 3a, 3b, and 3c are independent of each row of the heat transfer tubes 1a, 1b, and 1c. An inevitable shift occurs on the surface. Further, a deviation can be intentionally given. That is, the fin 3
Since a, 3b, and 3c are independent, the temperature boundary layer formed in the first row is updated when the airflow flows into the heat exchanger in the second row. Therefore, the heat transfer coefficient around the center of the first and second rows in the configuration in which the same fin has two rows of heat transfer tubes, and the windward end of the second row of fins 3b in the configuration of the present embodiment. Comparing the heat transfer coefficient in the vicinity, the temperature boundary layer becomes thinner when the fins 3 are arranged independently for each row,
The heat transfer coefficient increases. For this reason, when the fins in the first and second rows are made independent, the heat transfer performance is also improved. This is the same for the third row of heat exchangers. Therefore,
An outdoor unit equipped with a heat exchanger with independent fins in each row can improve heat transfer performance more than an outdoor unit equipped with a heat exchanger configured with independent fins in each row. it can.

During the heating operation, the fin front edge 11
Is highly susceptible to frost formation because of its high heat transfer coefficient. Therefore, in the present embodiment, as shown in FIGS. 5 and 6, a cutting line 12a is formed at the fin front edge 11a between the first row of heat exchanger tubes 1a and the fin front edge of the heat exchanger to be mounted. I have. The cutting line 12a becomes a heat-insulating cross section, and acts to block heat conduction between the heat transfer tube 1a and the fin front edge. That is, cutting line 1
The heat conduction to the windward side is prevented more than 2a, and the temperature of the fin leading edge 11a is increased, so that the frost is not concentrated on the fin leading edge, and the entire surface of the fin 3a can be uniformly frosted. . By uniformly forming frost, the heating operation time until the outside air flow is blocked by the frost and the defrosting operation is started can be lengthened, and the average heating performance can be improved. As described above, according to the present embodiment, a heat exchanger having independent fins is provided for each row of heat transfer tubes, and the cutting line 12 is provided at the fin front edge 11 in front of the heat transfer tubes 1. In addition, the heat transfer performance can be improved, the frost formation can be made uniform, the outdoor unit of the air conditioner having a long defrosting operation cycle and excellent heating performance can be obtained.

Embodiment 2 Hereinafter, a heat exchanger used in an outdoor unit of an air conditioner according to Embodiment 2 of the present invention will be described. In FIGS. 5 and 6 according to the first embodiment,
Although the cutting line 12a is formed only in the fin 3a in the front row on the windward side, a configuration in which the cutting lines 12a and 12b are formed in several rows of fins 3a and 3b on the windward side as shown in FIGS.
As shown in FIGS. 9 and 10, the fins 3a, 3b, 3
Alternatively, a configuration in which cutting lines 12a, 12b, and 12c are formed on c may be employed.

It is desirable to set the number of rows of the fins forming the cutting line 12 according to the conditions in which the outdoor unit is used.
That is, the temperature difference between the outside air temperature and the circulating refrigerant of the outdoor unit and the degree of the amount of moisture contained in the outside air differ depending on the air condition in which the outdoor unit of the air conditioner is used and the temperature condition of the circulating refrigerant.
When the temperature difference is small or the amount of moisture contained in the outside air is small, the inflow outside air is sufficiently dehumidified when passing through the first row of heat exchangers, and is supplied to the second and subsequent rows of heat exchangers. The amount of frost is small. In such a case, as shown in FIGS. 5 and 6, the cutting line 12a is formed only in the first heat exchanger row on the upstream side of the inflowing outside air. When the cutting lines 12b and 12c are formed in the second and third heat exchanger rows after the first row, respectively, the fin front edges 11a and 11 of the second and third rows are formed.
The fin temperature of b rises. Therefore, the cutting line 12a is formed only in the first heat exchanger row to prevent the fin front edges 11a and 11b in the second and third rows from rising, thereby keeping the heat transfer coefficient high. The frost formation can be made uniform and the heat transfer performance can be improved.

The cutting line 1 is provided only in the first heat exchanger row.
In the case of an outdoor unit used under the condition that the formation of 2a alone causes a large amount of frost on the second and subsequent rows, the flow of the inflowing outside air is immediately blocked, and the average heating capacity is not improved, FIG. The structure shown in FIG. That is, if the cutting lines 12a and 12b are formed in the upstream several rows of the inflow outside air, the heat transfer tubes 1a and
The heat conduction between the fin front edges 11a and 11b is prevented by blocking the heat conduction between the fin front edges 1b and the respective fin front edges, and the defrosting operation cycle is long, the heat transfer performance is good, and the outdoor performance is excellent. Machine. Further, in a heat exchanger having a larger number of rows, for example, a four-row heat exchanger, if the cutting line 12 is formed in the first and second rows or in the first, second, and third rows,
An outdoor unit having a long defrosting operation cycle, good heat transfer performance, and excellent heating performance can be provided.

In the case of an outdoor unit of an air conditioner used under conditions where the temperature difference between the temperature of the circulating refrigerant and the inflowing outside air is large or the amount of water contained in the inflowing outside air is large, FIG. As shown in FIG. 10, a cutting line 1 is formed at the fin front edges 11a, 11b, 11c between the heat transfer tubes 1a, 1b, 1c of all the rows of the heat exchanger and the front edges of the fins 3a, 3b, 3c.
2a, 12b and 12c are formed. Also in this case, it acts so as to block the heat conduction between the heat transfer tubes 1a, 1b, 1c and the respective fin leading edges, thereby preventing the concentration of frost on the fin leading edge portions 11 and uniformly attaching to the fins 3. Since the frost is formed, an outdoor unit having a long defrosting operation cycle and excellent average heating performance can be provided. Further, depending on the conditions in which the outdoor unit is used, it is not necessary to form the cutting lines 12 on all the upstream sides of the heat transfer tubes 1 in each row. For example, the cutting lines may be formed every other or every two or at random instead of regularly.

As described above, in the present embodiment, a heat exchanger having independent fins is provided for each row of heat transfer tubes, and the front edge 11 of the fins in front of the heat transfer tubes 1 is provided in accordance with the usage conditions of the outdoor unit. By providing the cutting line 12, it is possible to prevent the concentration of frost on the leading edge of the fin and to uniformly form frost on the entire heat exchanger without deteriorating heat transfer performance with a configuration optimal for use conditions. Can be. As a result, the outdoor unit of the air conditioner according to the present embodiment can have a long defrosting operation cycle and an excellent heating performance.

Embodiment 3 In the third embodiment, a heat transfer tube 1
This is an embodiment of the size and arrangement of the fins 3. Next, the fin width L1 of the heat exchanger row will be described with reference to FIG. The relationship with the inter-row distance L2 is L1ＬL2 when the fin ends of adjacent heat exchanger rows are aligned.
When the distance is increased, L1 <L2. In the conventional configuration, L1 <L3, and the step pitch L of the heat transfer tube 1 is set.
The relationship between No. 3 and the column distance L2 is L2: L3 ≒ √3: 2. With this configuration, the pipe distance L4 between rows of adjacent heat transfer pipes is L4 = L3. That is, the distance between the heat transfer tubes 1 in the adjacent row and the distance between the heat transfer tubes 1 forming the row are substantially the same. For this reason, when the heat exchanger as shown in FIG. 1 is configured, the heat transfer tubes 1 are connected to each other at the end in the x direction. The same parts can be used for piping of the mating rows, and the manufacturing cost can be reduced. Further, when the fin width L1 and the inter-row distance L2 are reduced with respect to the step pitch L3 of the heat transfer tubes, a multi-row heat exchanger can be mounted at a high density in a limited space, so that L1 <L3 is conventionally satisfied. Configuration.

As described above, conventionally, the fin width L1 <the heat transfer tube distance L4 = L3 as the heat transfer tube step pitch L3, or the fin width L1 and the inter-row distance L2 are reduced with respect to the step pitch L3. Make up. However, in these configurations, even if the frost on the fins 3 can be made uniform by any means to extend the duration of the heating operation, the fin width is small and the fin area for holding the frost is small. Therefore, there is a problem that the gap between the fin surfaces is easily closed.

Therefore, in the present embodiment, the cutting line 12 is provided to uniformly frost the fins 3 and the fin width L
1> It is configured to satisfy the step pitch L3 of the heat transfer tubes. When the fin width L1 is longer than the step pitch L3 of the heat transfer tubes, the fin area can be increased and the volume for holding frost can be increased. For this reason, the time until the space between the fin surfaces is closed can be lengthened, and the duration of the heating operation can be further lengthened.
Specifically, simply increasing the fin width L1 by several mm than the step pitch L3 of the heat transfer tubes can increase the fin area as a whole and increase the volume for holding frost. You can extend the time.

Embodiment 4 FIG. Hereinafter, an embodiment relating to a cutting line will be described. In the first and second embodiments, the cutting line 12 is formed in the front edge portion 11 of the fin in front of the heat transfer tube 1 in a linear shape, but is not limited to this. However, the position where the cutting line 12 is formed is the fin front edge 11 in front of the inflow outside air flow of the heat transfer tube 1. At the fin front edge 11, when comparing the fin temperature in front of the inflow outside air flow of the heat transfer tube 1 and the fin temperature in front of the inflow outside air flow between the heat transfer tubes, the heat transfer tube 1 is ahead of the inflow outside air flow of the heat transfer tube 1. That is, since the distance to the refrigerant is short, the fin temperature is low. For this reason, the fin temperature at the fin front edge portion 11 can be effectively increased by cutting the heat conduction by inserting the cutting line 12 so as to surround the front of the inflow outside air flow of the heat transfer tube 1 or the upstream side of the heat transfer tube 1. . As a result, it is configured to prevent frost from being concentrated on the front edge of the fin.

The longer the length of the cutting line 12 is, the easier it is to obtain a heat insulating effect on the fin leading edge 11. However, the length of the cutting line 12 is sufficient to suppress the amount of frost on the fin leading edge 11. If the length is increased, the strength of the fin 3 is reduced because the cutting line 12 is too long. For this reason, as shown in FIG. 12A, for example, the shape of the cutting line 12 is formed by combining a cutting line substantially parallel to the leading edge of the fin and a cutting line having an angle with the cutting line.
The heat transfer tube 1 may be surrounded. With this configuration, the cutting line length becomes shorter at the angled portion,
A decrease in the strength of the fins 3 can be prevented, and a heat insulating effect can be obtained efficiently. Further, as shown in FIG. 12B, a shape having an angle in a plurality of stages may be used. FIG.
There may be a slight gap between the cutting lines to be combined as shown in FIG. 2 (c). Instead of a combination of straight lines as shown in FIG. The heat tube 1 may be surrounded.

As described above, the cutting line may have any configuration as long as it has a shape that blocks heat conduction between the heat transfer tube 1 and the front edge of the fin. When the heat transfer tube 1 is configured to surround the heat transfer tube 1, heat conduction between the heat transfer tube 1 and the fin front edge can be effectively blocked while maintaining the strength of the fins 3.

Embodiment 5 Hereinafter, an outdoor unit of an air conditioner according to Embodiment 5 of the present invention will be described. This embodiment relates to a configuration of a fin of a heat exchanger and a method of molding the fin. As described in the first embodiment, the outdoor unit of the air conditioner according to the first embodiment has a configuration having a plurality of heat exchanger rows, and at least the fin front edge of the heat exchanger row on the upstream side of the flow of the outside air. The section 11 is provided with a cutting line 12. When the cutting line 12 is formed on the fin leading edge 11, as shown in FIG. 13, the fin surface may be largely displaced at the cutting line portion where the cutting line 12 is formed. When the displacement occurs, frost formation is concentrated on the cutting line portion due to the leading edge effect at the position of the displacement, and the ventilation resistance of the outside air flows. Therefore, it is desirable that the fin surface does not shift at the cutting line portion.

When the fin 3 is formed, if the blade is pressed against the fin 3 or cut with a cutting tool and the cutting line 12 is simply formed, the fin surface of the cutting line portion as shown in FIG. Cheap. Hereinafter, a method of manufacturing the fin 3 for suppressing the displacement of the fin surface due to the formation of the cutting line 12 will be described with reference to FIGS. In the figure, reference numeral 13 denotes a mold for fin molding. FIG. 14 shows a step of flattening the fin 3 on which the cutting line 12 has been formed by pressing. The upper part of the figure shows the plane of the fin 3,
The lower part is a cross-sectional view along the line AA showing the state of molding. FIG.
First, as shown in FIG. 14 (a), a plate-shaped fin 3 having a cutting line 12 is prepared, and as shown in FIG. 14 (b), pressed from above and below with a fin molding die 13 to press down the surface of the fin 3. . The press molding die 13 has a straight plane at a portion corresponding to the cutting line 12, and other portions, for example, a portion at a position between the heat transfer tubes 1, have corrugations.
For this reason, when the surface of the fin 3 is pressed by pressing in FIG. 14 (b) and the mold 13 is released in FIG. 14 (c), the cutting line portion becomes flat, and the deviation from the surface of the fin 3 can be suppressed. ,
Further, wavy irregularities are formed between the heat transfer tubes 1. Thereafter, in FIG. 14D, the leading edge and the trailing edge of the fin 3 are cut to a predetermined width.

If the fins are formed by using the means for suppressing the displacement of the fin 3 surface at the cutting line portion in this manner, there is an effect that the adverse effect that frost is concentrated on the displacement generated at the cutting line portion can be avoided. . Furthermore, in the molding method using the above-described press, it is possible to press the cutting line portion and at the same time, form appropriate irregularities in the portion of the fin surface where the cutting line does not exist. These irregularities can increase the rigidity of the fins 3 and facilitate the formation of a heat exchanger and an outdoor unit.
The heat transfer performance is improved by the air flow on the fin surface being disturbed by the uneven surface formed on the fin. Also, if the flat part of the end of the fin surface is made symmetrical during this press,
In the step of trimming the fins 3 at a predetermined width in FIG. 14D, the stress applied to the fins 3 is equalized to the left and right, and the fins 3 are less likely to be deformed, thereby facilitating the work. In the above, the fin 3
Although appropriate irregularities are formed by pressing on the surface of the fin 3 where the cutting line 12 is not included, in addition to the portion of the fin 3 where the cutting line 12 is not included, a further cutting line 1 is formed.
Appropriate unevenness may also be formed in the portion where 2 is included.
In this case, since the area of the fins on which the irregularities are formed can be increased, the rigidity of the fins 3 can be increased. Further, since the cutting line portion is pressed in an irregular shape, the fins 3 are continuous on both sides of the cutting line 12. Irregularities are formed in the shape, and the fin surface can be prevented from shifting on both sides of the cutting line 12 as shown in FIG.

As described above, according to the present embodiment, frost formation on the cutting line portion is performed by a relatively simple method of forming a cutting line on the fin and then pressing the fin surface by pressing. An outdoor unit of an air conditioner that can extend the duration of the heating operation by preventing the air conditioner can be obtained.

Embodiment 6 FIG. Hereinafter, an outdoor unit of an air conditioner according to Embodiment 6 of the present invention will be described. This embodiment relates to a configuration of a heat exchanger mounted on an outdoor unit of an air conditioner and a method of manufacturing the same. FIG. 15 is a perspective view showing a heat exchanger according to Embodiment 6, and FIG.
FIG. 6 is a plan view showing a main configuration of an outdoor unit equipped with the heat exchanger. In the figure, the same reference numerals as those in the first embodiment denote the same or corresponding parts, and a description thereof will be omitted.

As shown in FIG. 15, for example, three rows of heat exchangers are formed longer than the long sides of the box 4 of the outdoor unit, and the corners are formed along two surfaces of the box 4 of the outdoor unit. It is bent at almost 90 degrees. By using the bent heat exchanger 8, the heat exchanger area can be increased, and the heat exchange performance is improved. In addition, as shown in FIG. 16, the suction surface can be made in two directions, so that the suction surface can be widely used. Since the wind speed passing through the heat exchanger is reduced, the load on the blower is reduced and the power consumption is suppressed.

The heat exchangers shown in FIGS. 17 and 18 are bent at approximately 90 degrees at two corners along three surfaces of the box 4 of the outdoor unit. When such a heat exchanger is used, the three surfaces of the box body 4 of the outdoor unit can have the heat exchanger area, and the heat exchanger area can be large. For this reason, the heat exchange performance is improved. Also, as shown in FIG. 18, the suction surface can be formed in three directions, so that the suction surface can be widely used, and the wind speed passing through the heat exchanger is reduced, so that the load on the blower is reduced and power consumption is suppressed. Although FIGS. 15 to 18 show three rows of heat exchangers, the same applies to the case of two rows or four or more rows.

Hereinafter, a method of manufacturing a bent heat exchanger as shown in FIGS. 15 to 18 will be described with reference to FIGS. Here, a description will be given by using a shape in which only one side is bent as shown in FIG.
7. Needless to say, the same effect can be obtained even when the both sides are bent as shown in FIG.

FIG. 19 is a flow chart showing a process for producing a heat exchanger according to the present embodiment. A fin 3 is created in ST1. That is, the fins 3 of each row are formed with a predetermined width. Here, as shown in FIG. 14D, for example, necessary cutting lines 12 and irregularities on the fin surface are also provided. At least the fins located on the most upstream side in the inflow direction of the outside air include:
A cutting line is formed at the front edge of the fin in front of the heat transfer tube.
Next, fins and heat transfer tubes are arranged in ST2. In this case, a plurality of rows are arranged at predetermined row intervals with the heat transfer tubes 1 inserted into the fins 3. This is in the form of a flat heat exchanger that has not yet been bent. In ST3, the fins 3 and the heat transfer tubes 1 are joined by, for example, expansion. At this time, if one side of the heat exchangers in a plurality of rows are aligned and connected by the side plate 2, the heat exchanger can be easily handled as an integrated heat exchanger, and subsequent preparation work can be facilitated. Next, a plurality of rows are simultaneously bent in ST4. This is, for example, as shown in FIG.
4 (FIG. 20 (a)) and simultaneously bending a plurality of rows as shown in FIGS. 20 (b) and (c), it is relatively easy to simultaneously align and bend a plurality of heat exchanger rows. it can.

By simultaneously bending a plurality of heat exchanger rows as described above, the number of work steps for preparing the heat exchanger can be reduced, and the time required for preparing the heat exchanger can be shortened. In the heat exchanger manufactured according to the present embodiment, the fins are independently provided for each row of the heat transfer tubes, so that the heat transfer performance can be improved. Further, since at least the fin arranged on the most upstream side in the inflow direction of the outside air has a cutting line formed at the front edge of the fin in front of the heat transfer tube, the cutting line is mounted on the outdoor unit of the air conditioner. Accordingly, an outdoor unit that can prevent the concentration of frost on the front edge of the fin and can prolong the duration of the heating operation can be obtained.

[0046]

According to the present invention, in an outdoor unit of an air conditioner provided with a finned heat exchanger for exchanging heat between circulating refrigerant and outside air, the finned heat exchanger is moved in a direction in which outside air flows. A plurality of rows of heat transfer tubes, a plurality of fins independently provided for each row of the heat transfer tubes, and a plurality of fins penetrated by the heat transfer tubes, and a cutting line provided at a fin front edge portion in front of the heat transfer tubes. An air conditioner that can improve heat transfer performance with fins provided independently for each row of heat transfer tubes, and prolong the duration of heating operation by cutting lines formed at the front edge of the fins Outdoor unit can be obtained.

Further, according to the present invention, since the cutting line is provided so as to block heat conduction between the heat transfer tube and the leading edge of the fin,
It is possible to obtain an outdoor unit of an air conditioner that can efficiently prevent the formation of frost on the front edge of the fin, and can extend the duration of the heating operation.

According to the present invention, the fin width L1
Is longer than the step pitch L3 of the heat transfer tubes, it is possible to obtain an outdoor unit of an air conditioner that can take a large amount of frost holding volume of the heat exchanger and prolong the duration of the heating operation.

Further, according to the present invention, the cutting line is provided only at the front edge of the fin with respect to the row of the heat transfer tubes arranged on the most upstream side in the outside air inflow direction among the plurality of rows of heat transfer tubes. An outdoor unit of an air conditioner capable of improving heat transfer performance and extending the duration of the heating operation can be obtained with a configuration optimal for an outdoor unit used when the outside air condition in which frost occurs is relatively low.

Further, according to the present invention, the fin front edge is provided for each of the plurality of rows of heat transfer tubes including the row of heat transfer tubes arranged at the most upstream side in the outside air inflow direction among the plurality of rows of heat transfer tubes. Since it is provided in the air conditioner, it is possible to obtain an outdoor unit of an air conditioner that can improve the heat transfer performance and extend the duration of the heating operation with an optimal configuration according to the outside air condition to be used.

Further, according to the present invention, since the fin surface is provided at least in the portion where the cutting line is not formed, the duration of the heating operation can be extended by the cutting line, and the rigidity can be increased by the unevenness of the fin surface. And an air conditioner outdoor unit that can improve the heat transfer performance by disturbing the air flow on the uneven surface can be obtained.

Further, according to the present invention, a step of forming a cutting line on at least the fin arranged on the most upstream side in the inflow direction of the outside air, and a step of shifting the fins on both sides of the cutting line after forming the cutting line Pressing the portion of the fin on which the cutting line is formed, and inserting the heat transfer tube into the fin and joining the fin and the heat transfer tube so as to press the fin. An outdoor unit of an air conditioner that can extend the duration of the heating operation by preventing frost formation can be obtained, and a manufacturing method that can relatively easily manufacture a heat exchanger used for the air conditioner can be obtained.

Further, according to the present invention, at least a step of forming a cutting line on the fin arranged at the most upstream side in the inflow direction of the outside air, and inserting a heat transfer tube into the fin to form the fin and the heat transfer tube Joining together to form a heat exchanger row;
The step of overlapping and bending the plurality of heat exchanger rows at the same time provides an outdoor unit of an air conditioner that has a long heating operation duration and can improve heat transfer performance, and further includes a heat exchanger used for this. The number of manufacturing steps can be reduced, and the production time can be shortened.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a heat exchanger mounted on an outdoor unit of an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing one row portion of a plurality of rows of a heat exchanger mounted on an outdoor unit of the air conditioner according to Embodiment 1.
FIG. 2A is an overall perspective view, and FIG. 2B is a partially enlarged view.

FIG. 3 is an external perspective view showing an outdoor unit of the air conditioner according to Embodiment 1.

FIG. 4 is a plan view showing an outdoor unit of the air conditioner according to Embodiment 1.

FIG. 5 is a partial cross-sectional view showing the heat exchanger according to the first embodiment.

FIG. 6 is a partial top view showing the heat exchanger according to the first embodiment.

FIG. 7 is a partial cross-sectional view illustrating a heat exchanger according to Embodiment 2 of the present invention.

FIG. 8 is a partial top view showing a heat exchanger according to a second embodiment.

FIG. 9 is a partial cross-sectional view illustrating a heat exchanger according to a second embodiment.

FIG. 10 is a partial top view showing a heat exchanger according to a second embodiment.

FIG. 11 is an explanatory diagram related to Embodiment 3 of the present invention, illustrating the size and arrangement of heat transfer tubes and fins.

FIG. 12 is a partial cross-sectional view illustrating a heat exchanger according to Embodiment 4 of the present invention.

FIG. 13 is an explanatory view showing a fin cross section near a cutting line portion according to the fifth embodiment of the present invention.

FIG. 14 is a process chart showing fin molding according to the fifth embodiment in the order of steps.

FIG. 15 is a perspective view showing a heat exchanger according to Embodiment 6 of the present invention.

FIG. 16 is a plan view showing an outdoor unit of an air conditioner according to a sixth embodiment.

FIG. 17 is a perspective view showing a heat exchanger according to a sixth embodiment.

FIG. 18 is a plan view showing an outdoor unit of an air conditioner according to a sixth embodiment.

FIG. 19 is a flowchart showing a procedure for producing a heat exchanger according to the sixth embodiment.

FIG. 20 is an explanatory diagram illustrating a bending step of the heat exchanger according to the sixth embodiment.

FIG. 21 is an explanatory diagram showing a state of frost formation on a heat exchanger of a conventional outdoor unit.

FIG. 22 is a partial cross-sectional view showing a conventional heat exchanger.

[Explanation of symbols]

1,1a, 1b, 1c heat transfer tube, 3,3a, 3b, 3c
Fins, box of outdoor unit, outside air intake surface, 6
Outside air blowing surface, 7 Outside air flow direction, 8 Heat exchanger, 9
Blower, 10 compressor, 11, 11a, 11b, 11c
Fin front edge, 12, 12a, 12b, 12c cutting line, 13 fin molding die, 14 heat exchanger bending jig, L1 fin width, L2 inter-row distance, L3 heat transfer tube step pitch, L4 heat transfer tube row Piping distance between.

Claims (8)

[Claims] 1. An outdoor unit of an air conditioner provided with a finned heat exchanger for exchanging heat between a circulating refrigerant and outside air, wherein the finned heat exchangers are arranged in a plurality of rows in a direction in which outside air flows. A heat transfer tube, a plurality of fins independently provided for each row of the heat transfer tubes, and a plurality of fins penetrated by the heat transfer tube, and a cutting line provided at a front edge of the fin in front of the heat transfer tube. Air conditioner outdoor unit. 2. The outdoor unit of an air conditioner according to claim 1, wherein the cutting line is provided so as to block heat conduction between the heat transfer tube and the leading edge of the fin. 3. The width L1 of the fin is determined by the step pitch L of the heat transfer tube.
The outdoor unit of an air conditioner according to claim 1 or 2, wherein the outdoor unit is longer than 3. 4. A cutting line is provided only at a fin front edge portion of a row of heat transfer tubes arranged on the most upstream side in the outside air inflow direction among a plurality of rows of heat transfer tubes. The outdoor unit of the air conditioner according to claim 2 or 3. 5. A cutting line is provided at a front edge portion of a fin for each of a plurality of rows of heat transfer tubes including a row of heat transfer tubes arranged on the most upstream side in the outside air inflow direction among a plurality of rows of heat transfer tubes. The outdoor unit of an air conditioner according to claim 1, 2 or 3, wherein the outdoor unit is an air conditioner. 6. The outdoor unit of an air conditioner according to claim 1, wherein at least a portion of the fin where a cutting line is not formed has irregularities. 7. A step of forming a cutting line on at least a fin arranged on the most upstream side in an inflow direction of outside air, and forming the cutting line so as to suppress displacement of the fins on both sides of the cutting line after forming the cutting line. A method for manufacturing a heat exchanger, comprising: a step of pressing a portion of the fin where the cutting line is formed; and a step of inserting a heat transfer tube into the fin and joining the fin and the heat transfer tube. 8. A step of forming a cutting line at least in a fin arranged at the most upstream side in the inflow direction of the outside air, inserting a heat transfer tube into the fin, joining the fin and the heat transfer tube, and forming a heat exchanger. A method for manufacturing a heat exchanger, comprising a step of forming a row and a step of overlapping and bending a plurality of the heat exchanger rows at the same time.