JPH06257977A - Plate fin and tube type heat exchanger - Google Patents

Abstract

PURPOSE:To manufacture a fin easily while simplifying and miniaturizing the manufacturing facility thereof, in a plate fin and tube type heat exchanger formed by bending a plate fin at notches provided at predetermined positions in the lengthwise direction of the fin so as to have a chevron shape. CONSTITUTION:The number of stage of tube holes 22, bored along the lengthwise direction of a palte fin 21, is made even stages and notches 23, 24 are positioned at the middle part of the even stages.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate fin and tube heat exchanger suitable for a wall-mounted indoor unit of a separation type air conditioner.

[0002]

2. Description of the Related Art An example of a conventional indoor unit of this type is shown in FIG.
Is shown in. In FIG. 3, reference numeral 1 is a main body casing, 2 is a front panel attached to the front surface of the main body casing 1, and 3 is a plate fin-and-tube type arranged so as to face a suction grill 2a formed in the front panel 2. A heat exchanger, 4 is a cross-flow type fan arranged below the heat exchanger 3, and 5 is a front panel 2.
An air outlet formed in the lower part of the air blower, 6 a horizontal louver arranged in the air outlet 5, 7 a vertical louver arranged in the air outlet 5, and 8 arranged below the heat exchanger 3. Drain pan,
Reference numeral 9 is an air filter arranged on the back surface of the suction grill 2a.

During operation of the air conditioner, the fan 4 rotates,
Refrigerant from an outdoor unit (not shown) circulates in the heat exchanger 3. Then, the indoor air becomes
When the air filter 9 is sucked into the body casing 1 from the suction grill 2a and the air filter 9 is flowed through, the dust contained therein is removed. Then, in the process of passing through the heat exchanger 3, heat is exchanged with the refrigerant for cooling or cooling. After being heated and then sucked into the fan 4 and urged, the blowout direction is regulated by the vertical louver 7 and the horizontal louver 6, and the air is blown from the air outlet 5 into the room.

The plate fin-and-tube heat exchanger 3 has a large number of plate fins 3a arranged in parallel with each other with a small gap, and fixed in two rows and seven stages penetrating the plate fins 3a at right angles. With a large number of tubes 3b,
A notch provided at a predetermined position in the longitudinal direction of the plate fin 3a
The upper part 31 and the lower part 32 of 3c are bent into a dogleg shape at a notch 3c so as to form a predetermined angle, thereby increasing the heat exchange area of the body casing 1 without increasing the thickness, width and height of the body casing 1. ing.

[0005]

In order to further increase the capacity of the conventional plate fin-and-tube heat exchanger 3 described above, if the tubes 3b are increased and arranged in three rows, the manufacturing equipment for the fins 3a is complicated and large. There was a problem that it became expensive.

[0006]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to provide a large number of plate fins arranged in parallel with each other with a minute gap therebetween. , With a large number of tubes fixed in multiple rows and multiple stages penetrating these plate fins at right angles,
In a plate fin-and-tube heat exchanger formed by bending the plate fin at a notch provided at a predetermined position in the longitudinal direction, the number of stages of the tubes is set to an even number and the notch is formed in the middle of the even number. The plate-fin and tube heat exchanger is characterized in that

It is possible to provide a cutout portion inside the bent portion of the plate fin and a cutout portion outside thereof.

[0008]

According to the present invention, since the plate fin is provided, the plate fin can be easily manufactured and the manufacturing facility thereof can be made compact.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. The plate fins 21 of the plate fin and tube heat exchanger 20 are provided with a large number of tube holes 22 for penetrating the tubes in three rows in a zigzag arrangement.
Except for these holes 22, a large number of louvers 26 are cut and raised on the entire surface. The number of steps of the tube hole 22 along the longitudinal direction of the plate fin 21 is an even number (12 in the figure), and the notch 23 between the even steps, that is, the sixth step and the seventh step, 24 and notches 25 are provided. By bending the plate fin 21 into a dogleg shape by the notches 23 and 24 and the notch 25, the upper portion 20A and the lower portion 20B of the plate fin 21 are bent.
Have a predetermined angle.

FIG. 2 shows the manufacturing procedure of the plate fin 21. A large flat plate-shaped fin material 200 made of a thin aluminum plate is intermittently transferred in the direction of the arrow, and in the process of transfer, the tube hole 22 and the notch 2
3, 24, notches 25, notches 28 for louvers 26, cut lines 27, 28 made of half blanking, etc. are stamped. In the next step, the louver 26 is raised by a press molding machine, and the curling process around the tube hole 22 is performed.In the subsequent step, the plate lines 21A, 21B and 21C are separated by separating the separating lines 27 and 28. It

The plate fin thus manufactured
After arranging 21 parallel to each other with a minute gap, after inserting the tubes into the tube holes 22 of these plate fins 21, the tubes are expanded and fixed to the fins 21. After that, the plate fin 21 is attached to the notches 23 and 24.
After being bent at the notches 25, pipes such as U vents are fitted to the ends of the tubes, temporarily assembled with the frame etc., and brazed in the furnace. The notch 25 is the plate fin 21.
It can also be inserted when folding.

However, when the tube holes 22 are arranged in three rows in a staggered pattern, adjacent fins, for example, fins
The patterns of 21A and 21B are turned upside down, but if the number of tube holes 22 along the longitudinal direction of the plate fin 21 is set to an even number and the notches 23 and 24 are located in the middle of these even steps, the fin material 200 The plate fin 21 having the tube holes 22 of other even stages, for example, 10 stages, 8 stages, etc. can be obtained by adjusting the feeding of the plate fins. Further, since the gap between the cutouts 23, 24 of the plate fin 21A and the cutouts 23, 24 of the plate fin 21B along the vertical direction becomes small, the cutting die for stamping the cutouts 23, 24 is small. Can be converted.

[0013]

According to the present invention, since the number of stages of the tube is an even number and the notch is positioned in the middle of the even number, the plate fin can be easily manufactured and the manufacturing facility thereof is small and simple. Can be converted. Further, if the notch is provided inside the bent portion of the plate fin and the notch is provided outside, the plate fin can be easily bent at the notch.

[Brief description of drawings]

FIG. 1 is a side view showing fins of a plate fin-and-tube heat exchanger according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a manufacturing procedure of the fin of the above embodiment.

FIG. 3 is a schematic vertical sectional view showing an example of a conventional indoor unit.

[Explanation of symbols]

 21 Plate fin 22 Tube hole 23, 24 Notch 25 Notch

Claims (2)

[Claims] 1. A plate fin comprising a plurality of plate fins arranged in parallel with each other with a minute gap and a plurality of tubes penetrating the plate fins at right angles and fixed in multiple rows and stages. In a plate fin-and-tube heat exchanger that is bent at a notch provided at a predetermined position in the longitudinal direction, the number of stages of the tubes is an even number, and the notch is positioned in the middle of this even number of stages. Plate fin and tube type heat exchanger characterized by. 2. The plate-fin and tube heat exchanger according to claim 1, wherein a notch is provided inside the bent portion of the plate fin and a notch is provided outside the bent portion.