JPH09159313A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heat exchanging performance by improving the flow of the condensed water generated on a fin surface of a heat exchanger for an outdoor unit during the heating operation to prevent the condensed water from being frozen on the fin surface. SOLUTION: The flow of the condensed water on a fin surface generated during the heating operation is improved by providing holes 11 in longitudinally parallel rows or in the V-shape at least between two refrigerant pipe insertion holes 9-9 located at a lower part of a fin 8 of a heat exchanger erected in a heat exchanging chamber of an outdoor unit, and by providing notched parts 12 at the lower end, and no water is condensed to improve the heat exchanging performance during the heating operation.

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 for an outdoor unit of an air conditioner.

[0002]

2. Description of the Related Art An outdoor unit of an air conditioner is divided into a heat exchange chamber 5 and a machine chamber 6 by a partition plate 4 standing upright on a base 2, as shown in FIG. In the heat exchange chamber 5, a heat exchanger 7 and a blower for cooling the heat exchanger 7 by air are arranged. In one machine chamber 6, a compressor and a blower on the side of the compressor and the heat exchange chamber 5 are arranged. A control device and the like for controlling the above are arranged. As shown in FIG. 4, the heat exchanger 7 has a plurality of refrigerant pipe insertion holes 9 for inserting refrigerant pipes and cut-and-raised parts (louvers) 10. As shown in FIG. 5, the heat exchanger 7 is laminated together with side plates 20 at predetermined intervals. Aluminum fins 21
And a plurality of hairpin-shaped refrigerant tubes orthogonal to the fins 21.
22 and a plurality of connecting pipes 23 for connecting the refrigerant pipes 22 to each other. The side plates 20 are used to stand upright on the bottom plate 2 of the outdoor unit.

[0003]

By the way, when a heating operation is performed in an air conditioner including an outdoor unit having such a heat exchanger 7 and an indoor unit (not shown), the above-mentioned fin 21 Condensed water 24 on the surface due to the temperature difference from the outside air
Occurs. The condensed water flows as water droplets down the surface of the fins 21, reaches the bottom plate 2, and then flows out to the outside. The distance (fin pitch) P between the stacked fins 21 is about 1.5 mm at the maximum. Since there is only one, there is a problem that the condensed water 24 flowing down is bridged between the fins and does not flow down in the lower part of the fin 21, freezing and the heat exchange performance is deteriorated. In order to eliminate the freezing ice 25 that deteriorates such heat exchange performance, the fin pitch may be increased to improve the flow of condensed water. However, such a method reduces the number of fins 21 to be stacked and further reduces heat generation. The exchange performance will be reduced. Therefore, in the present invention,
It is an object of the present invention to provide a heat exchanger that improves the flow of condensed water without reducing the number of fins that are stacked.

[0004]

The present invention has been made to solve the above-mentioned problems, and has a plurality of refrigerant pipe insertion holes for inserting hairpin-shaped refrigerant pipes and is laminated at predetermined intervals. A fin and a heat exchanger formed of a connecting pipe or the like for connecting the refrigerant pipes inserted in the refrigerant pipe insertion holes to each other and standing in the heat exchange chamber, wherein at least two refrigerant pipes inserted under the fins are inserted. A hole is provided between the holes, and a cutout is provided at the lower end of the fin.

[0005]

With the above construction, the area between the opposing fins is reduced by providing a hole between at least two refrigerant pipe insertion holes located below the fin and providing a notch at the lower end of the fin. , Condensed water easily flows down.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the inside of a main body of an outdoor unit of an air conditioner from an obliquely rear side, 1 is a part of the main body, 2 is a bottom plate (also referred to as a base), and 3 is a front panel having an outlet. The inside of the main body 1 is divided into a heat exchange chamber 5 and a machine room 6 by a partition plate 4 provided upright on the base 2. The heat exchange chamber 5 and the heat exchanger 7 are air-cooled. An air blower for controlling the compressor and a fan for controlling the compressor and the heat exchange chamber 5 are disposed in one machine room 6. The heat exchanger 7 has a plurality of refrigerant pipe insertion holes and cut-and-raised parts (louvers) as described in the section of the prior art, and fins stacked at predetermined intervals and a plurality of hairpin-shaped members orthogonal to the fins. This refrigerant pipe and a plurality of connecting pipes that connect the refrigerant pipes to each other, and the present embodiment is characterized by the fin shape described below.

FIG. 2 shows the lower part of the fins 8 constituting the heat exchanger 7 from the surface, 9 is a refrigerant pipe insertion hole, and 10 is a louver provided to increase the heat exchange area. By the way, the feature of this fin 8 is that two rectangular holes 11 are provided vertically in parallel between the plurality of lower refrigerant pipe insertion holes 9-9-9, and two cutouts 12 are provided at the lower end. Is provided. By providing the hole 11 and the notch 12 as described above, the surface area of the lower portion of the fins 8 facing each other is reduced, and for the condensed water (water droplets) that flows down, the voids that cause the bridge state are reduced, so that the condensed water flows down. It will be easier to do. Also, the fin 8
Since the cutout 12 is provided at the lower end of the
The gap between and becomes large, and the condensed water flowing down to the bottom plate 2 can be discharged to the outside more quickly. Although the holes 11 are provided in parallel in the present embodiment, the present invention is not limited to this, and the same effect can be obtained by forming the left and right holes 11 in an eight shape as shown in FIG. Is obtained.

[0008]

EFFECT OF THE INVENTION In the case of the heat exchanger using the fins as described above, the flow of condensed water on the fin surface generated during the heating operation is improved, and it becomes difficult for frost to form, so that the ventilation state is stable. The heat exchange performance during heating operation is improved.

[Brief description of the drawings]

FIG. 1 is a rear internal perspective view of an outdoor unit according to the present invention and a conventional example.

FIG. 2 is a fin surface view of a heat exchanger showing an embodiment of the present invention.

FIG. 3 is a fin surface view of a heat exchanger according to another embodiment of the present invention.

FIG. 4 is a fin surface view of a heat exchanger showing a conventional example.

FIG. 5 is an enlarged view of a main part showing a schematic configuration of a heat exchanger.

[Explanation of symbols]

 2 Bottom plate (base) 7 Heat exchanger 8 Fins 9 Refrigerant pipe insertion hole 10 Cut and raised (louver) 11 Hole 12 Notch

Claims (6)

[Claims] 1. A fin having a plurality of refrigerant pipe insertion holes for inserting hairpin-shaped refrigerant pipes, which is laminated at a predetermined interval, and a connecting pipe for connecting the refrigerant pipes inserted through the refrigerant pipe insertion holes, etc. In the heat exchanger installed upright in the heat exchange chamber, a hole is provided between at least two refrigerant pipe insertion holes located in the lower portion of the fin, and a cutout portion is provided at the lower end of the fin. Characteristic heat exchanger. 2. A fin, which has a plurality of refrigerant pipe insertion holes for inserting hairpin-shaped refrigerant pipes and is laminated at a predetermined interval, and a connecting pipe for connecting the refrigerant pipes inserted through the refrigerant pipe insertion holes, etc. In the heat exchanger installed upright in the heat exchange chamber, a hole is provided between the at least two refrigerant pipe insertion holes located in the lower portion of the fin in an eight shape, and a cutout portion is provided at the lower end of the fin. A heat exchanger characterized by being provided. 3. The heat exchanger according to claim 1, wherein a plurality of the holes and the notches are provided. 4. The heat exchanger according to claim 1, wherein each of the holes is formed in a rectangular shape. 5. The heat exchanger according to claim 1, wherein the heat exchanger is L-shaped. 6. The heat exchanger according to claim 1, wherein the heat exchanger has a two-row configuration or a three-row configuration.