JP3317152B2 - Heat exchanger, manufacturing method thereof, and air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a heat exchanger in which a resistance portion is provided at a bent portion which is bent at a notch of a fin.

[0002]

2. Description of the Related Art FIG. 9 shows a method of sealing a notched portion of a fin having a bent portion of a conventional heat exchanger disclosed in Japanese Patent Application Laid-Open No. Hei 3-5637. In the figure, 7 is a heat transfer tube, 8
Is the upper fin of the heat exchanger, 9 is the lower fin of the heat exchanger,
Reference numeral 10 denotes a metal sealing material. In this heat exchanger, a notch 6a is provided on the air intake side of the fin and a notch 6b is provided on the air outflow side, and the fin is bent at a bent portion 20 which is a part of the fin.

In the fin tube type heat exchanger provided with such a bent portion 20 having the cutout portion 6a, the passage resistance of the cutout portion 6a of the heat exchanger is small when the heat exchanger is used without using a sealing material. Therefore, air flows in without heat exchange. Further, in the air conditioner of the heat exchanger having the cutout 6a, when cooling the warm air by the refrigerant flowing through the heat transfer tube during the cooling operation, warm air that is not heat-exchanged flows in from the air suction side of the heat exchanger. Then, the warm air is cooled at once by the cooled air and the cooled fan, and dew is generated on the fan, causing dew flying. Therefore, in order to prevent the above-mentioned phenomenon, the metal sealing member 10 which is a separate component from the fin is attached to the notch 6a.

[0004]

In a fin tube type heat exchanger provided with a bent portion 20 having a notch portion 6a,
If the cutout 6a is used without using a sealing material, air flows in without heat exchange because the passage resistance of the cutout 6a of the fin of the heat exchanger is small. Further, in the air conditioner of the heat exchanger having the bent portion 20, when the warm air is cooled by the refrigerant flowing through the heat transfer tube during the cooling operation, warm air that is not heat-exchanged flows in from the air suction side opening of the heat exchanger. Then, the warm air is cooled at once by the cooled air and the cooled fan, and dew is generated on the fan, causing dew flying. Therefore, in order to prevent the above-mentioned phenomenon, it is necessary to mount the metal sealing member 10 which is a separate component from the fan in the cutout portion 6a, which increases the number of parts and the number of assembly steps, and also increases the cost. There were challenges.

[0005] The present invention solves the above-mentioned problems, and comprises the above-mentioned fin provided in a bent portion which is bent at a notch provided on the air intake side of the fin and which blocks the flow of air. It is an object of the present invention to provide a heat exchanger provided with a resistance part.

[0006]

According to the present invention, there is provided a heat exchanger having fins which are arranged in parallel at intervals and through which air flows, and heat transfer tubes inserted into the fins and through which a refrigerant flows. in exchanger, each fin, the
Air inlet and flow provided for bending fins
Each notch on the exit side and one of the fins between the notches
And a resistance portion that cuts and raises the portion so as to be orthogonal to the air flow and that blocks the flow of air.

Further, cut-and-raised height of the resistance portion is what is substantially the same as the <br/> fin pitch.

Further, cut-and-raised the width of the resistance portion is not more than half of the heat transfer tube stage pitch.

Further, in a heat exchanger comprising fins arranged in parallel at intervals and through which air flows, and heat transfer tubes inserted into the fins and through which a refrigerant flows, each of the fins is each notch on the air inflow side and the outflow side provided for folding the fin, the air
Make the edge of the notch on the air inflow side perpendicular to the air flow.
And cut and raised so as to surround the notch.
And a resistance part for blocking the flow of air.

[0010] Further, the notch height of the notch portion is
It is the same as the above fin pitch.

Further, a flat fin and a fin inserted into the fin
The heat transfer tube provided with
Insertion hole processing for inserting the heat transfer tube into the
Notch at front and rear end of fin for bending fin back and forth
Machining, and the cut-and-raised portion provided between the notches
A step of performing a notch processing, and
Cutting and forming a cut-and-raised portion;
Inserting the heat transfer tube into the insertion hole of the heat transfer tube;
Using the notch at the front and rear, insert the fin
And bending to a predetermined angle .

Further, a flat plate fin and a fin inserted into the fin are provided.
The heat transfer tube provided with
Insertion holes for inserting the heat transfer tubes into
Cutting the front and rear ends of the fin to bend the fin back and forth
Notching and cutting the front end.
Squeezing so that the edge of the
Inserting the heat transfer tube into the insertion hole of the heat transfer tube;
Using the notch at the front and rear, insert the fin
And bending to a predetermined angle .

An air conditioner provided with the heat exchanger according to any one of the first to fifth aspects.

In the heat exchanger as described above, a rising line 22 parallel to the step direction of the heat transfer tube 7 is provided at the bent portion 20 of each fin as shown in FIG. For example, a U-shaped cut 21 having a height c of the cut-and-raised portion 11 is formed, and the cut 21 is cut and raised in the heat transfer tube penetrating direction. The height of the cut-and-raised portion 11 is set to the same height as the fin pitch, which is the distance between the centers of the fin thicknesses of the fins.
Is smaller than half the length b of the step pitch a, which is the distance between the centers of the heat transfer tubes in the heat transfer tube row arranged in a staggered arrangement. As described above, the flow of the air heat exchanged by the heat transfer tubes on the windward side of the upper and lower fins of the bent portion 20 is not blocked. The cut-and-raised portion 11 formed by cutting and raising the bent portion 20 of the fin as described above blocks the inflow of the air that has not been heat-exchanged and is sucked from the front grill 5, and the air is used as the upper fin 8 of the heat exchanger. And heat is exchanged in the notch 6a of the lower fin 9 of the heat exchanger, and the passage resistance is not reduced. Also, during the cooling operation, if air that does not perform heat exchange is sucked in, it is rapidly cooled immediately after passing through the heat exchanger, so that dew is generated, and the dew is blown off by the fan 2, causing dew flying. However, by providing the cut-and-raised portion 11 in the bent portion 20 of the fin, the occurrence of dew can be suppressed.

Although the height of the cut-and-raised portion 11 is the same as the fin pitch, when the heat exchanger is bent, the cut-and-raised portion 11 is distorted, so that a small gap is formed. Since the fin pitch, which is the center-to-center distance of the fin thickness of the fin row, is about 1.3 mm and that the air flow path in the bent portion 20 of the heat exchanger fin is prevented, the fin is cut into this small fin pitch. An airflow can be blocked by providing a wake-up, and the influence of some gaps is small. That is, the cut and raised portion 11 can sufficiently prevent the flow of air. The notch is provided with the air suction side 6a and the air outflow side 6b to make the fin easy to bend. However, if the fin is bent without the notch 6b, only the air suction side 6a is sufficient.

Further, the rising line 22 and the U-shaped notch 21 are provided to form the cut-and-raised portion 11, but the rising line and the U-shaped notch are not provided, but the cut-and-raised notch is provided. A part may be provided. Also,
Although the cut-and-raised portion 11 is provided by the U-shaped cut 21, the resistance portion may be substituted by cutting and raising the hole of the heat transfer tube. Further, the resistance portion may be formed by extruding and deforming the fin instead of cutting and raising.

Embodiment 2 FIG. In the first embodiment,
The cut-and-raised portion 11 provided in the fin is provided in the bent portion 20 so as to block the flow of air from the air suction side to the cutout portion 6a. In the second embodiment, as shown in FIG.
In the notch 6a on the air suction side of the bent portion 20 of the heat exchanger, a wall 12 surrounding the edge of the notch 6a is provided on each fin.

In order to block the flow of air from the air suction side to the notch 6a of the heat exchanger, the height of the wall 12 surrounding the edge of the notch 6a provided on the fin is defined as the fin pitch. It is the same. Further, the wall 12 surrounding the edge of the notch 6a is formed by drawing and raising. However, the deepest portion of the notch 6a for bending the fin of the heat exchanger has no drawing and rising portion. Although it is difficult to perform the drawing-up process completely, the fin pitch, which is the center distance of the fin thickness of the fin row, is about 1.3 mm.
The small fin pitch can be cut and raised to block the flow of air, and the effect of some gaps is small. That is, the cut-and-raised portion 11 can sufficiently prevent the flow of air. Further, by rounding the deepest portion of the cutout portion 6a of the heat exchanger, the wall 12 can be easily drawn and raised. Although the notch is provided with the air intake side 6a and the air outflow side 6b to make the fin easy to bend, it is sufficient to provide only the air intake side 6a when the fin is bent without providing the notch 6b. From the above, the wall 1 that blocks the air that has not been exchanged heat
By configuring the fins 2 as part of the fins, there is no need to mount the fins with separate parts, so that the number of assembly steps and the number of parts can be reduced, and the cost can be reduced.

Embodiment 3 FIG. 7 is a schematic flowchart of the manufacturing method according to the first embodiment. First, a fin is processed from a flat plate. The fins are formed by drilling holes in the flat plate through which the heat transfer tubes pass, and then forming cutouts 6a and 6b in the heat exchanger where the fins are to be bent 20 so that the fins can be bent. At the same time, the rising line 2 which becomes the cut-and-raised portion 11 of the fin of the present invention is formed at the bent portion 20 of the fin of the heat exchanger.
Make a U-shaped notch based on 1 and start the notch.

Thereafter, the fins are arranged at intervals, the heat transfer tubes are inserted into the row of fins, and the fins and the heat transfer tubes are mounted. Further, the heat exchanger is bent at a predetermined angle to open the notch 6a of the fin of the heat exchanger. Here, a wall that blocks the flow of air from the air suction side to the bent portion 20 of the fin of the heat exchanger as in the first embodiment is formed.

Embodiment 4 FIG. FIG. 8 is a schematic flowchart of the manufacturing method according to the second embodiment. First, a fin is processed from a flat plate. The fins are formed by making holes in the flat plate through which the heat transfer tubes pass, and then forming notches 6a and 6b in the heat exchanger where the bent portions 20 are to be formed. At the same time, the edge of the notch 6a of the fin of the heat exchanger is subjected to the drawing start-up processing as in the second embodiment, thereby raising the edge of the notch 6a. Thereafter, the fins are arranged, the heat transfer tubes are inserted into the fin row, and the fins and the heat transfer tubes are mounted. Further, the heat exchanger is bent at a predetermined angle to open the notch 6a of the fin in the heat exchanger. Here, a wall is formed that blocks the flow of air from the air suction side to the bent portion 20 of the fin of the heat exchanger as in the second embodiment.

[0022]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, the fins are arranged in parallel at intervals and air flows between them.
A heat transfer tube inserted into the fins and through which the refrigerant flows,
In the heat exchanger having the above respective fins, said fins
Of the air inflow and outflow sides provided for bending
Empty each notch and part of the fin between the notches
A resistor portion for blocking the flow of air formed by cutting and raising as perpendicular to the airflow, so equipped and for blocking the flow of air that has not been heat exchanged in the cutout portion in a part of the fin, parts And a heat exchanger that prevents dewdrops can be obtained.

Further, since the cut-and-raised height of the notch is the same as the fin pitch, it is possible to obtain a heat exchanger that substantially blocks the flow of air that has not been heat-exchanged in the notch .

Further, cut-and-raised the width of the resistance portion, since it is less than half of the heat transfer tube stage pitch, to block the flow of air whose heat has been exchanged with the heat transfer tubes of the upwind side of the upper and lower fins of the bend portion Absent.

Further, in a heat exchanger including fins arranged in parallel at intervals and through which air flows, and heat transfer tubes inserted into the fins and through which a refrigerant flows, each of the fins is each notch on the air inflow side and the outflow side provided for folding the fin, the air
Make the edge of the notch on the air inflow side perpendicular to the air flow.
And cut and raised so as to surround the notch.
A resistor portion for blocking the flow of air, so equipped and notch
In order to block the flow of air that has not been heat-exchanged at the part of the air inlet side fin, the number of assembly steps and the number of parts are reduced,
It is possible to obtain a heat exchanger that prevents dew flying .

Further, since the cut-and-raised height of the notch is the same as the fin pitch, it is possible to obtain a heat exchanger that substantially blocks the flow of air that has not been heat-exchanged in the notch .

Further, a flat plate fin and the fin
The heat transfer tube provided with
Insertion hole processing for inserting the heat transfer tube into the
Notch in front and rear end of fin to bend back and forth
Processing and cutting of the cut-and-raised portion provided between the notches
Cutting and cutting the cut
Raising and forming a cut-and-raised portion;
Inserting the heat transfer tube into an insertion hole;
Use the notches at the front and rear
Since the method for manufacturing a heat exchanger includes the step of bending the heat exchanger to a predetermined angle, the manufacturing of the heat exchanger is easy because the fin cutting is performed before bending.

Also, a flat plate fin and the fin
The heat transfer tube provided with
Insertion holes for inserting the heat transfer tubes into
Notch in front and rear end of fin to bend back and forth
And the step of notching the front end.
Squeezing so that the edge rises,
Inserting the heat transfer tube into an insertion hole;
Use the notches at the front and rear
Since the method for manufacturing a heat exchanger includes the step of bending the heat exchanger to a predetermined angle, the manufacturing of the heat exchanger is easy because the fin cutting is performed before bending.

Since the air conditioner is provided with the heat exchanger, for example, during cooling operation in the air conditioner, when warm air is cooled by the refrigerant flowing through the heat transfer tube, heat exchange is performed from the suction side opening of the heat exchanger. If warm air that does not flow in is cooled, the warm air is cooled at once by the heat-exchanged cold air and the cooled fan, causing dew to occur on the fan and causing dew to fly. The walls surrounding the wall reduce the inflow of warm air and reduce the occurrence of dew.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an indoor unit in an air conditioner according to an embodiment of the present invention.

FIG. 2 is a perspective view of the heat exchanger according to the embodiment of the present invention.

FIG. 3 is an enlarged view of the fin before bending according to the first embodiment of the present invention.

FIG. 4 is an enlarged view of a fin according to the first embodiment of the present invention.

FIG. 5 is a perspective view of FIG. 4;

FIG. 6 is an enlarged view of a fin according to the second embodiment of the present invention.

FIG. 7 is a schematic flowchart of a manufacturing method according to the first embodiment of the present invention.

FIG. 8 is a schematic flowchart of a manufacturing method according to a second embodiment of the present invention.

FIG. 9 is an enlarged side view of a fin of a conventional fin tube type heat exchanger.

[Explanation of symbols]

1 Fin tube type heat exchanger, 2 fans, 3 water trays, 4 outlet grille, 5 front grille, 6a notch on air intake side, 6b notch on air outflow side, 7 heat transfer tube, 8 heat exchanger Upper fin, 9 Lower fin of heat exchanger, 10 Sealing material, 11 Cut and raised part, 12 Fin wall, 20 Bent part, 21 cut.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-53836 (JP, A) JP-A-3-5637 (JP, A) JP-A-6-126544 (JP, A) JP-A-58-58 187226 (JP, A) Fully open sho 59-123222 (JP, U) Fully open sho 63-121278 (JP, U) Real open sho 54-84163 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) F24F 1/00 391 F24F 1/00 361 F28F 1/32

Claims (8)

(57) [Claims] 1. A arranged in parallel at intervals, and the fins through which the air flows therebetween, and heat transfer tubes refrigerant inside is inserted into the fin to flow in the heat exchanger having a top
Each fin is provided to bend the fin .
Notches on the air inlet and outlet sides, and these notches
Cut and raise some of the fins between the sections so that they are
And a resistance part configured to block the flow of air formed by the heat exchanger. 2. A cut-and-raised height of the resistance portion, heat exchanger according to claim 1, characterized in that is substantially identical to the Fi <br/> Npitchi. 3. A cut-and-raised the width of the resistance portion, heat exchanger according to claim 2, characterized in that less than half of the heat transfer tube stage pitch. Wherein arranged in parallel at intervals, and the fins through which the air flows therebetween, and heat transfer tubes refrigerant inside is inserted into the fin to flow in the heat exchanger having a top
Each fin is provided to bend the fin .
Notches on the air inflow and outflow sides and the air inflow
Edge of the cutout on the side so as to be perpendicular to the air flow, and
A heat exchanger, comprising: a resistance portion cut and raised so as to surround the cutout portion, and configured to block an air flow. 5. The heat exchanger according to claim 4, wherein the cut-out height of the notch is the same as the fin pitch. 6. A flat plate fin and inserted into the fin.
And a heat transfer tube.
A hole for inserting the heat transfer tube into the
Notch at front and rear ends of fin to bend back and forth
And cutting of the cut-and-raised portion provided between the notches
Cutting and cutting the cut
Raising and forming a cut-and-raised portion;
Inserting the heat transfer tube into an insertion hole;
Use the notches at the front and rear
Bending at a fixed angle.
Manufacturing method of heat exchanger . 7. A flat plate fin and inserted into the fin.
And a heat transfer tube.
The full insertion hole machining parallel beauty for inserting the heat transfer tubes
Notch at front and rear end of fin for bending fin back and forth
And the step of notching the front end.
Squeezing so that the edge rises,
Inserting the heat transfer tube into an insertion hole;
Use the notches at the front and rear
Bending at a fixed angle.
Manufacturing method of heat exchanger. 8. An air conditioner comprising the heat exchanger according to any one of claims 1 to 5 .