JP3132349B2 - Heat exchanger for air conditioner and method for manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat exchanger for an air conditioner.

[0002]

2. Description of the Related Art A conventional heat exchanger for an air conditioner of this type is shown in FIG. This heat exchanger is
A plurality of fins 61 stacked at a predetermined gap
And a heat transfer tube 63 inserted into a plurality of staggered holes 62 formed in the fins 61.

[0003] The fin 61 of the heat exchanger is bent at a predetermined angle at substantially the center in one of the ventilation directions. The fin 61 before this bending is shown in FIG.
As shown in FIG. 4A, the fin 61 is substantially at the center,
A notch 65 having a divergent shape opened by a predetermined angle of the bending and a pin-shaped slit 66 opposite to the notch 65 are formed. And the fin 61
Is bent to the side of the divergent notch 65 at substantially the center, while the divergent notch 65 closes, the pin-shaped slit 66 opens, and the fin 61
Has the shape shown in FIG.

[0004] When the heat exchanger of the air conditioner is bent as described above, the height of the heat exchanger can be reduced, and as shown in FIG. There is an advantage that the space utilization efficiency inside the air conditioner can be improved and the indoor unit of the air conditioner can be downsized.

In the heat exchanger shown in FIG. 4B, a V-shaped cut 67 is formed on the opposite side of the fin 61 from bending, and the air passing through the V-shaped cut 67 is sufficiently exchanged with heat. Can not do it. In order to prevent air from flowing through the V-shaped cut portion 67, FIG.
As shown in (D), there is a device provided with a sealing material 68 for closing the V-shaped cut portion 67 (Japanese Patent Laid-Open Publication No. Hei 3-5637).

[0006]

However, the structure shown in FIG. 4D has the disadvantage that the number of parts increases and the number of assembling steps increases because the sealing material 68 must be provided.

An object of the present invention is to provide an air conditioner capable of realizing a bent shape for downsizing an indoor unit without reducing the heat exchange efficiency and without increasing the number of parts and the number of assembly steps. And a method for manufacturing the same.

[0008]

To achieve the above object, a heat exchanger for an air conditioner according to the first aspect of the present invention is arranged so as to be stacked with a predetermined gap therebetween and has a plurality of holes having a plurality of holes. In a heat exchanger of an air conditioner comprising a fin and a plurality of heat transfer tubes inserted into the hole and penetrating the plurality of fins, the plurality of fins are provided on one side in the ventilation direction and at one end in the ventilation direction Is bent to the opposite side to the slit at the location where the slit formed toward the other side end, and the edges of the plurality of fins on the slit side are bent in the direction in which the fins are stacked. Thus, the space between the adjacent fins is closed, and the bent edge forms the wall surface of the V-shaped groove.

Therefore, according to the first aspect of the present invention, since the bent edge portion covers the space between the fins and forms the wall surface of the V-shaped groove, the air is reduced. It is possible to prevent entry into the V-shaped groove. Therefore, a decrease in heat exchange efficiency can be prevented. This is because the portion where the groove is formed has a small heat exchange area and has almost no heat exchange function.

According to the first aspect of the present invention, the groove is closed by a part of the fin for heat exchange without using the seal member 68 for closing the groove as in the conventional example. Therefore, simply bending the fin in the ventilation direction around the cut end of the slit does not cause an increase in the number of parts or the number of assembly steps, and for reducing the indoor unit size without reducing the heat exchange efficiency. A bent shape can be realized.

According to a second aspect of the present invention, there is provided a method of manufacturing a heat exchanger for an air conditioner, comprising: a plurality of fins arranged so as to be stacked with a predetermined gap therebetween; Forming a slit from one end toward the other end, and bending the slit-side edges of the plurality of fins in a direction in which the fins are stacked to close a space between adjacent fins. The step of forming the wall surface of the V-shaped groove at the bent edge portion is sequentially performed.

According to the second aspect of the present invention, the edge which is a part of the fin is bent, and this edge is used as a partition between the space between the fins and the groove space surrounded by the slit. . Therefore, according to the invention of claim 2, the slit surrounds the space between the fins at a part of the fins for heat exchange without using the sealing material for closing the grooves as in the conventional example. It can be closed against the groove space. Therefore, according to the second aspect of the present invention, a heat exchanger capable of realizing a bent shape for downsizing an indoor unit without increasing the number of parts and the number of assembling steps and without reducing the heat exchange efficiency is manufactured. can do.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 2 shows an embodiment of a heat exchanger of an air conditioner according to the present invention, and FIG. 1 shows a state in which a plurality of fins 1 constituting the embodiment of FIG. 2 are not bent. As shown in FIG. 1, this embodiment includes a plurality of fins 1, 1, 1,... Arranged so as to be stacked at a predetermined interval. The fin 1 has a plurality of holes 2. A heat transfer tube 3 is inserted into the hole 2, and the heat transfer tube 3 penetrates the fin 1.

The plurality of fins 1 have slits 5 cut from the upstream side to the downstream side in the ventilation direction S. The plurality of adjacent slits 5 surround a wedge-shaped groove space 6 having a substantially V-shaped cross section. Then, the edge 7 of the fin 1 which is in contact with the slit 5
Are bent in the direction in which the fins 1 are stacked. The edge portion 7 forms a wedge-shaped wall surface 4 having a substantially V-shaped cross section, which closes a space 8 between the fins 1 with respect to the groove space 6.

The heat exchanger H shown in FIG. 1 is bent in a direction opposite to the slit 5 in the ventilation direction S at the location where the slit 5 exists, and the bent heat exchange H as shown in FIG. Become a vessel.

In the heat exchanger H having the above configuration, the edge portion 7 forms the wall surface 4 that closes the space 8. Therefore, in the space 8 between the fins 1, air is filled with the arrow S _1.
And one sucked the path shown by the ventilating direction and the arrow S ₂ and S ₃ of S _4, the groove chamber 6 surrounding the slit 5 will not be sucked air. Therefore, according to the heat exchanger of FIG. 2, a decrease in heat exchange efficiency can be prevented. The reason is that the portion of the fin 1 where the slit 5 is formed has a small heat exchange area and a small heat exchanger function.

Further, according to the heat exchanger of this embodiment, since the V-shaped wall surface 4 is formed by the edge 7 of the fin 1, the space 8 between the fins 1 is closed. There is no need to separately prepare a seal member for closing the groove. Therefore, according to this heat exchanger, it is possible to realize a bent shape for downsizing the indoor unit without increasing the number of parts and the number of assembling steps and without reducing the heat exchange efficiency.

In this embodiment, the fin 1 is bent as shown in FIG. 1 and then the heat exchanger is bent as shown in FIG. The edge 7 may be bent after the bent shape shown in FIG.

Next, a method of bending the edge 7 of the fin 1 while forming the slit 5 of the heat exchanger H will be described with reference to FIG.

This method uses a circular cutter 11 shown in FIG. The circular cutter 11 includes a disk-shaped blade 12 and a support 13 that supports the blade 12. The blade 12 has a tapered peripheral portion 14. Further, the support portion 13 is provided with the circular cutter 11.
Depressed portion 1 disposed rearward of cutting direction G
Five. As shown in FIG. 3A, a plane F passing through the center in the thickness direction of the disc-shaped blade 12 passes through the edge 17 of the tapered portion 16 of the depressed portion 15. The tapered portion 16 is tapered from the rear in the cutting progress direction G to the front. Therefore, when the tapered portion 16 is looked down from vertically above in the traveling direction G shown in FIG. 3B, the tapered portion 16 becomes an elongated trapezoidal shape tapered toward the traveling direction G as shown in FIG. appear. The dimension of the short side L1 of the trapezoid is slightly smaller than the thickness d of the blade 12, while the dimension of the long side L2 of the trapezoid is larger than the thickness d of the blade 12. Has become.
The larger the difference (L2-L1) between the long side L2 and the short side L1, the larger the bending width w of the edge 7 of the fin 1. In addition,
In this method, the circular cutter 11 is used, but a flat (for example, rectangular, trapezoidal, triangular, etc.) cutter may be used instead of the circular cutter 11.

In this method, the circular cutter 11 is advanced by rotating the circular blade 12 while the flange 18 of the circular cutter 11 is in contact with the upstream end 1A of the fin 1 in the ventilation direction. Push in the direction G. Then, first, the circular blade 12 cuts the fin 1 to form the slit 5. Next, the front end 16A of the tapered portion 16 of the falling portion 15 enters the slit 5, and the fin 1 is stacked on the edge 7 while the edge 7 of the fin 1 is expanded by the tapered surfaces 16B and 16C. Bend in the direction that you are. Then, the formation of the slit 5 and the bending of the edge portion 7 are sequentially and continuously performed, and when the rear end 16D of the tapered portion 16 passes through the slit 5 of the fin 1, as shown in FIG. The bending of the edge 7 of the plurality of fins 1 is completed.

This bent edge 7 closes the space 8 between the adjacent fins 1. Therefore,
According to the heat exchanger manufacturing method of this embodiment, the edge 7 which is a part of the fin 1 is bent, and the edge 7 forms the wedge-shaped wall surface 4 having a substantially V-shaped cross section. The space 8 is closed by the wall surface 4 with respect to the groove space 6. Therefore, according to this method, the inter-fin space 8 can be closed by the edge 7 which is a part of the fin 1 for heat exchange without using a sealing material for closing the groove as in the conventional example. Therefore, according to this method, it is possible to manufacture the heat exchanger H capable of realizing a bent shape for downsizing the indoor unit without increasing the number of parts and the number of assembling steps and without reducing the heat exchange efficiency. Can be.

[0024]

As is apparent from the above description, in the heat exchanger of the air conditioner according to the first aspect of the present invention, a plurality of fins are provided on one side in the ventilation direction, from one end to the other end in the ventilation direction. The slits are bent in the opposite side to the slit at the location where the formed slit exists, and the edges of the plurality of fins on the slit side are bent in the direction in which the fins are stacked, and the adjacent fins are bent. The space between the fins is closed, and the curved edge forms the wall surface of the V-shaped groove.

Therefore, according to the first aspect of the present invention, the bent edge forms a wall surface of the V-shaped groove by closing the space between the fins, so that air is not generated. It is possible to prevent entry into the V-shaped groove. Therefore, a decrease in heat exchange efficiency can be prevented. This is because the portion where the groove is formed has a small heat exchange area and has almost no heat exchange function.

Further, according to the first aspect of the present invention, the space between the fins is closed by the edge which is a part of the fin for heat exchange without using the sealing member 68 for closing the groove as in the conventional example. I have. Therefore, simply bending the fins in the ventilation direction around the cut ends of the slits does not cause an increase in the number of parts or assembling steps, and reduces the size of the indoor unit without reducing the heat exchange efficiency. A bent shape can be realized.

According to a second aspect of the present invention, there is provided a method of manufacturing a heat exchanger for an air conditioner, comprising: a plurality of fins arranged so as to be stacked with a predetermined gap therebetween; Forming a slit from one end to the other end, and bending the slit-side edges of the plurality of fins in a direction in which the fins are stacked to close a space between adjacent fins. The step of forming the wall surface of the V-shaped groove at the bent edge portion is sequentially performed.

According to the second aspect of the present invention, the edge, which is a part of the fin, is bent to make the edge a partition between the space between the fins and the groove space surrounded by the slit. . According to the second aspect of the present invention, the space between the fins is slit at the edge which is a part of the fins for heat exchange without using the sealing material for closing the grooves as in the conventional example. Can be closed against the surrounding groove space. According to the second aspect of the invention, a heat exchanger capable of realizing a bent shape for downsizing an indoor unit without increasing the number of parts and the number of assembling steps and without reducing the heat exchange efficiency is manufactured. can do.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a heat exchanger of an air conditioner of the present invention.

FIG. 2 is a perspective view showing a bent shape of the heat exchanger.

FIG. 3A is a plan view illustrating an embodiment of a method of manufacturing a heat exchanger of an air conditioner of the present invention, and FIG.
(B) is a perspective view of a circular cutter used in the above method.

FIG. 4A is a side view of a conventional heat exchanger before bending, FIG. 3B is a perspective view of the conventional heat exchanger after bending, and FIG. FIG. 3D is a cross-sectional view of an indoor unit in which a conventional example is incorporated, and FIG. 3D is a perspective view showing a seal member for closing a V-shaped notch formed outside a bent portion of the conventional heat exchanger.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fin, 2 ... Hole, 3 ... Heat transfer tube, 4 ... Wall surface, 5 ... Slit, 6 ... Groove space, 7 ... Edge, 8 ... Space, H ... Heat exchanger, 11 ... Circular cutter, 12 ... Blade, 13 ... Support part, 1
4 ... peripheral part, 15 ... falling part, 16 ... taper part, 17 ... edge, G ... traveling direction, 18 ... flange part.

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Koichi Mizuguchi 1000 Oya, Okamotocho, Kusatsu-shi, Shiga 2 Daiga Industries Co., Ltd. Shiga Works (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 1/00 F24F 13/30

Claims (2)

(57) [Claims] 1. An air conditioner comprising: a plurality of fins having a plurality of holes arranged so as to be stacked with a predetermined gap therebetween; and a plurality of heat transfer tubes inserted into the holes and penetrating the plurality of fins. In the heat exchanger, the plurality of fins are bent on one side in the ventilation direction, at a position where a slit formed from one side end to the other side end in the ventilation direction exists, to the opposite side to the slit, and The edges on the slit side of the plurality of fins are bent in the direction in which the fins are stacked to block the space between adjacent fins, and the bent edges have V
A heat exchanger for an air conditioner, wherein the heat exchanger has a groove-shaped wall. 2. A step of forming a slit on one side in the ventilation direction of a plurality of fins arranged so as to be stacked with a predetermined gap therebetween, from one end of the ventilation direction to the other side end; The edge of the fin on the slit side is bent in the direction in which the fins are stacked to close the space between adjacent fins, and the bent edge forms a V.
Forming the wall surfaces of the U-shaped grooves in a continuous manner.