JPH08200719A - Heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to reduce the difference between the lower end portion of the plate fin and the temperature of the air passing through other than the lower end portion, and to provide a heat exchanger that does not cause dew condensation on the blower fan. And [Structure] A large number of plate fins arranged in parallel with each other with a small gap, and a large number of heat transfer tubes fixed in multiple rows and multiple stages penetrating these plate fins at right angles,
In a heat exchanger formed by bending the plate fin at a plurality of notches a provided at predetermined positions in its longitudinal direction,
In the longitudinal direction of the one side or the other side of the cutout portion a, at a position slightly separated from the cutout portion a, at the same time as the cutout portion a, the through hole or one side is released by the same mold. Approximately L
A plurality of hollow portions b having a larger size and shape than the cutout portion a formed in the shape of a letter are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in an indoor unit of an air conditioner, and more particularly to the shape of plate fins constituting the heat exchanger.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional air conditioner indoor unit has a heat exchanger 3 and a blower in an air passage formed between a suction port 2 and a blowout port 5 provided in a main body 1. The fan 4 is provided, and the left / right airflow direction plate 6 and the up / down airflow direction plate 7 are provided from the rear of the air outlet 5. The heat exchanger 3
For example, as shown in FIGS. 5 (A) and 5 (B), a large number of plate fins that are arranged in parallel with each other with a minute gap therebetween, and a large number of plates that pass through these plate fins at right angles and are fixed in multiple rows and stages. And the plate fin is bent and formed by a single or a plurality of notches a provided at a predetermined position in the longitudinal direction. In the above configuration, since the condensed water is likely to adhere to the lower end portion of the plate fin and the temperature thereof is likely to decrease, a difference occurs between the air temperature passing through the lower end portion and the air temperature passing through other than the lower end portion, There is a problem that dew condensation occurs on the blower fan 4 when the air having different temperatures is mixed. Therefore, as shown in FIGS. 5 (A) and 5 (B), by bending or removing the b portion on one side of the lower end portion of the plate fin, the ventilation resistance of the lower end portion is reduced to reduce the difference in the air temperature. Measures such as reducing the amount were considered. However, when the b portion is bent, the bent b portion increases ventilation resistance at the lower end portion of the plate fin, resulting in an increase in the difference in the air temperature. There is a problem in that the workability is poor and the cost is disadvantageous in removing.

[0003]

In the present invention, by reducing the ventilation resistance at the lower end of the plate fin, the difference between the lower end and the temperature of the air passing through other than the lower end can be reduced, It is an object of the present invention to provide a heat exchanger that does not cause dew condensation on a blower fan.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a large number of plate fins arranged in parallel with each other with a minute gap therebetween, and these plate fins are penetrated at right angles. And a plurality of heat transfer tubes fixed in multiple rows and stages, wherein the plate fin is bent at a plurality of notches provided at predetermined positions in its longitudinal direction, the heat exchanger comprising: It is characterized in that a plurality of hollow portions are formed by the same die at the same time at the positions slightly separated from each other in the longitudinal direction at the same cutout portion. Further, the hollow portion is formed to be larger than the cutout portion. Further, the hollow portion is formed on one side of the cutout portion. Further, the hollow portion is formed on the other side of the cutout portion. Further, the hollow portion is formed by a through hole. Further, it is characterized in that the hollow portion is formed in a substantially L shape with one side open.

[0005]

According to the above construction, the ventilation resistance at the lower end portion of the plate fin is reduced, the difference between the lower end portion and the temperature of the air passing through other than the lower end portion is reduced, and dew condensation occurs on the blower fan. It becomes a perfect heat exchanger.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the heat exchanger according to the present invention used in an indoor unit of an air conditioner will be described below with reference to the accompanying drawings. 1, FIG. 2 (A) (B), FIG.
In (A) and (B), 1 is an indoor unit body of an air conditioner,
Reference numeral 2 denotes a suction port provided on the front cover detachably attached to the main body 1 and an upper surface of the main body 1, and 3 denotes heat exchange of air sucked from the suction port 2 provided in the main body 1. The heat exchanger 4, which is provided in the main body 1, blows the heat-exchanged air to a blower outlet described later, 5
Is an outlet for blowing out the air that has undergone heat exchange by the blower fan 4 into the room; Up and down wind direction plate. The heat exchanger 3 includes a large number of plate fins arranged in parallel with each other with a small gap therebetween, and a large number of heat transfer tubes fixed in multiple rows and penetrating the plate fins at right angles. The fins are bent into an inverted V shape and a substantially V shape by a plurality of notches described later provided at predetermined positions in the longitudinal direction. 3a is one side of the plate fin bent in the inverted V shape, 3b is the other side of the plate fin bent in the inverted V shape, and the plate bent in the substantially V shape. One side of the fin, 3c is the other side of the plate fin bent and formed in the substantially V shape, and 3d is a thin portion formed on one side of a hollow portion described later. Reference numeral a denotes a plurality of notches provided at predetermined positions in the longitudinal direction of the plate fin, and the notches a are formed on the one side 3a of the plate fin bent in the inverted V shape and the inverted V. It is formed between the other side 3b of the plate fin bent in a V shape and the one side 3b of the plate fin bent in a substantially V shape, and is bent in the inverted V shape. Formed between the other side of the plate fin and the one side 3b of the plate fin bent and formed in the substantially V shape, and the other side 3c of the plate fin bent and formed in the substantially V shape. By cutting the cutout portion described below up to the cutout portion a, as described above, the plate fin is reversed V by the cutout portion a.
It is configured to be bent into a letter shape and a substantially V shape.
Reference numeral b denotes a hollow portion formed at a small distance from the notch portion a on one side in the longitudinal direction of the plate fin. As shown in FIGS. 2 (A) and 2 (B), the hollow portion b is slightly separated from the notch portion a to one side in the longitudinal direction of the plate fin, as compared with the notch portion a. When the hollow portion b is located at the lower end portion of the plate fin, the ventilation resistance of the lower end portion is reduced, and the hollow portion b passes through the lower end portion and portions other than the lower end portion. The difference from the air temperature is reduced so that dew condensation does not occur on the blower fan 4. Reference numeral c is a cutting portion for cutting or cutting the plate fin. The cutting portion c cuts the plate fin from a predetermined position corresponding to a length dimension used for the main body 1, and the cutout portion a cuts the plate fin. Since the plate fins are bent and formed in an inverted V shape and a substantially V shape, the plate fins are cut out to the notch portion a. A and A ′ are one stage when the plate fin is pressed by a progressive die, and with the above configuration, the cutout portion a in the one stage A and A ′,
Also, the hollow portion b formed with a small clearance from the notch portion a to one side or the other side in the longitudinal direction of the plate fin can be simultaneously processed by the same progressive die having the same size and shape. It is configured such that a plurality of the hollow portions b can be processed by processing a plurality of times with the progressive die.

Further, in the above-mentioned configuration, as another embodiment, FIG.
As shown in (A) and (B), the hollow portion b is formed in a substantially L shape with one side open, and is formed on the other side in the longitudinal direction of the plate fin with a small clearance. . With the above configuration, when the substantially L-shaped hollow portion b is located at the lower end portion of the plate fin, the ventilation resistance of the lower end portion is decreased, and the temperature of the air passing through the lower end portion and other than the lower end portion is reduced. It is configured such that the difference between the above and the above is reduced, and the dew condensation on the blower fan 4 is prevented.

With the above structure, when the plate fin is bent into an inverted V shape and a substantially V shape by the cutout portion a as shown in FIG. 2B, the vicinity of the cutout portion a is formed. While the ventilation resistance of the hollow portion b does not change significantly by the hollow portion b, the lower end portion of the plate fin is thinned by the hollow portion b, and the ventilation resistance of the lower end portion decreases, The difference between the portion and the temperature of the air passing through other than the lower end portion is reduced, and the plate fin has a shape that does not cause dew condensation on the blower fan. The thin portion 3d projected to the lower end of the plate fin shown by hatching in FIG. 2 (B) is bent inward or laterally to correct the protruding state and to be easily handled. Further, the thin portion 3d near the cutout portion a is guided to the lower end along the plate fin so as not to drop water droplets in the middle of the plate fin, and a drain pan (not shown) provided below the lower end. ) It is configured to be dropped on top.

Further, according to the above construction, when the plate fin is bent into an inverted V shape and a substantially V shape by the cutout portion a as shown in FIG. 3B, the cutout portion is formed. Although the ventilation resistance of the substantially L-shaped hollow portion b in the vicinity of a does not change significantly, the lower end portion of the plate fin is thinned by the hollow portion b, and the ventilation of the lower end portion is reduced. The resistance is reduced, and the difference between the lower end portion and the temperature of the air passing through a portion other than the lower end portion is reduced, so that the plate fin has a shape that does not cause dew condensation on the blower fan. Also, the thin portion 3d near the cutout portion a
Is configured such that water drops are guided from the middle of the plate fin to the lower end along the plate fin and dropped on a drain pan (not shown) provided below the lower end. With the above configuration, the lower end portion of the plate fin becomes thin due to the hollow portion b, the ventilation resistance of the lower end portion decreases, and there is a difference between the lower end portion and the air temperature passing through other than the lower end portion. The heat exchanger is provided with plate fins that are reduced to prevent condensation on the blower fan.

[0010]

As described above, according to the present invention, the ventilation resistance at the lower end portion of the plate fin is reduced without using a special device or the like, so that the plate fin passes through the lower end portion and a portion other than the lower end portion. A heat exchanger that reduces the difference from the air temperature and does not cause condensation on the blower fan.

[Brief description of drawings]

FIG. 1 is a side view of the indoor unit and the heat exchanger in a state in which the indoor unit of the air conditioner according to the present invention is used.

FIG. 2 is an explanatory view of a main part of the heat exchanger according to the present invention, in which (A)
Is a development view of the plate fins that make up the heat exchanger,
(B) shows a state in which the plate fins are bent and formed.

FIG. 3 is an explanatory view of main parts showing another embodiment of the heat exchanger according to the present invention, (A) is a development view of plate fins constituting the heat exchanger, and (B) is a bent plate fin. Shows the state.

FIG. 4 is a side view of the indoor unit and the heat exchanger showing a state in which the indoor unit of the air conditioner according to the conventional example is used.

FIG. 5 is an explanatory view of a main part of a heat exchanger according to a conventional example, (A).
Shows a state in which the plate fins constituting the heat exchanger are bent and formed in a substantially V shape, and (B) shows a state in which the plate fins are bent and formed in a substantially V shape and an inverted V shape.

[Explanation of symbols]

 1 Indoor unit body 2 Suction port 3 Heat exchangers 3a, 3b, 3c Plate fins 3d Thin part 4 Blower fan 5 Outlet port 6 Left and right wind direction plate 7 Vertical wind direction plate a Notch part b Cutout part c Cutout part A, A ' One stage

Claims (6)

[Claims] 1. A plate fin comprising: a plurality of plate fins arranged in parallel with each other at a small interval; and a plurality of heat transfer pipes penetrating the plate fins at right angles and fixed in multiple rows and stages. In a heat exchanger formed by bending a plurality of cutouts provided at predetermined positions in the longitudinal direction, at the position slightly separated from the cutouts in the longitudinal direction, at the same time as the cutouts, hollowing is performed by the same mold. A heat exchanger having a plurality of parts. 2. The heat exchanger according to claim 1, wherein the hollow portion is formed to be larger than the cutout portion. 3. The heat exchanger according to claim 1, wherein the hollow portion is formed on one side of the cutout portion. 4. The heat exchanger according to claim 1, wherein the hollow portion is formed on the other side of the cutout portion. 5. The heat exchanger according to claim 1, 2, 3, or 4, wherein the hollow portion is formed by a through hole. 6. The heat exchanger according to claim 1, wherein the hollow portion is formed in a substantially L shape with one side open.