JPH10277681A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the generation of a bridge between fins caused by being attached with frost and to increase the strength of the fin bent in a wave-like in comparison with a conventional goods in a heat exchanger produced by fitting a coolant tube in a tube fitting groove of the wave-like bent fin. SOLUTION: In a heat exchanger produced by providing a tube fitting groove on a projected and/or a bottom part of a fin 1 formed by bending into a wave- like, and by fitting a coolant tube 3 in this groove, a fin pitch of an air inlet side 1A in this heat exchanger is formed so as to be made coarser in comparison with the fin pitch of the air outlet side 1B, and a reinforcing flange 105 is formed on the fin of the side of the fin pitch being made coarser.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger mainly used for evaporators and condensers of refrigerators, showcases and the like, and relates to a heat exchanger formed by fitting a refrigerant tube to a fin. .

[0002]

2. Description of the Related Art In general, there is known a heat exchanger manufactured by forming a groove for fitting a tube in a peak and / or a valley of a fin formed by bending in a wavy shape, and fitting a refrigerant tube into the groove. . In this type of heat exchanger, the fin pitch on the air inlet side is roughened so that bridge-like clogging due to frost formation is not formed between the fins.
"Bridge". ) Is generally suppressed.

[0003] In order to prevent the formation of bridges due to frost, the applicant of the present invention provided a flat plate having a portion to be bent to bend in a wavy shape, and extended the other side with reference to one side in the direction of the portion to be bent. A portion of the other side of the flat plate is removed so as to change the length of the flat plate, and the flat plate is bent along a portion to be bent, and the fin pitch of the other side is compared with the fin pitch of the one side. A heat exchanger has been already proposed in which a rough and corrugated fin is formed and a refrigerant tube is manufactured by fitting a refrigerant tube into a tube fitting groove formed in the peak and / or valley of the wavy fin.

[0004]

However, in the conventional structure, when removing a part of the other side of the flat plate along the portion to be bent, the strength of the fins is reduced, and the tube is removed. When the refrigerant tube is fitted into the fitting groove, the fin may be bent, and the contact between the fin and the tube may be deteriorated, and the performance as a heat exchanger may be reduced. In addition, the fin pitch is often disturbed when the refrigerant tube is inserted. As a result, the air passage area is reduced, and the performance as a heat exchanger is also reduced. In this case, the pressure loss on the air side is further reduced. There was also an increasing problem.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a heat exchanger capable of increasing the strength of a fin bent in a wave shape.

[0006]

According to the first aspect of the present invention, a groove for fitting a tube is provided in a peak and / or a valley of a fin formed by bending in a wavy manner, and a refrigerant tube is fitted in this groove. In the manufactured heat exchanger, the fin pitch on the air inlet side of the heat exchanger is formed so as to be coarser than the fin pitch on the air outlet side, and a reinforcing flange is provided on the fin with the fin pitch roughened. It is characterized by having been formed.

According to a second aspect of the present invention, there is provided a flat plate having a portion to be bent to bend in a wave shape, and the length of the flat plate to another side with respect to one side in the direction of the portion to be bent is changed. As described above, a part of the other side of the flat plate is removed while leaving a margin for a flange near the portion to be bent, and the flat plate is bent along the portion to be bent to reduce the fin pitch on the other side to the one side. A corrugated fin having a reinforcing flange formed by the flange margin is formed on the fin having a coarser fin pitch than the fin pitch on the side, and the peaks and / or corrugations of the corrugated fin are formed. It is characterized by being manufactured by fitting a refrigerant tube into a tube fitting groove formed in a valley.

According to these inventions, even in a heat exchanger manufactured by fitting a refrigerant tube into the tube fitting groove of a fin bent in a wavy shape, the fin pitch on the air inlet side is changed to the fin pitch on the air outlet side. Since it is formed so as to be coarser, generation of a bridge between fins due to frost formation can be suppressed.

Further, since the reinforcing fin is formed on the fin on the side where the fin pitch is roughened, the strength of the fin is not reduced.

[0010]

An embodiment of the present invention will be described below with reference to the accompanying drawings. In this specification,
The term "aluminum" includes various aluminum alloys in addition to pure aluminum.

In FIG. 1, reference numeral 100 denotes a heat exchanger;
This heat exchanger 100 is mainly used as an evaporator for refrigerators, showcases, vending machines, and the like. The heat exchanger 100 has fins 1, and the fins 1 are formed by bending a flat plate made of aluminum into a wave shape, as described later. At the peaks and / or valleys of the fins 1, there are provided grooves 5 (FIG. 2) for fitting tubes, and the grooves 5 for fitting tubes (FIG. 2) have meandering bent refrigerant tubes. 3 is inserted into the heat exchanger 1
00 is formed.

In the heat exchanger 100, as shown in FIG. 1, air flows from a portion 1A (hereinafter, referred to as an "air inflow portion") to a portion 1B (hereinafter, referred to as an "air outflow portion"). And heat exchange is performed.

Next, the fin 1 will be described.

In FIG. 3, reference numeral 10 denotes an aluminum flat plate. The flat plate 10 is provided with portions 101, 101... 101 to be bent over a plurality of rows. The flat plate 10 is, as shown in FIG.
The fins 1 are formed from the flat plate 10 by being bent in a wave shape.

The flat plate 10 is provided with a plurality of openings 13 forming a groove 5 (FIG. 2) for fitting a tube after being bent in a wave shape. A rib 51 is provided. Further, the flat plate 10 includes a plurality of plate-like portions 11 (FIG. 3) constituting the rising portions of the fins 1 after being bent in a wavy shape, and the fins 1 having been bent in a wavy shape.
And a second connection portion 12b that forms a peak of the fin 1 after being bent in a wave shape.

Further, a part of the flat plate 10 on the other side 10b side is bent so that the length to the other side 10b with respect to one side 10a in the direction along the to-be-folded portion 101 is changed. The flange portion 103 is removed in the vicinity of the predetermined portion 101, and an opening (hereinafter, referred to as a "removed portion") 14 is formed therein. According to this, each removing unit 14
Is removed from one side 10a of the flat plate 10 to the other side 10b.
The length up to changes like La and Lb. In this case, the width W of the flange margin 103 is defined to be at least 1/5 or more of the fin pitch.

Such a flat plate 10 is to be bent 101
2, short portions appear every other as shown in FIG. 2, and eventually this heat exchanger 100
According to this, the fin pitch on the air inflow portion 1A side is formed to be coarser than the fin pitch on the air outflow portion 1B side.

According to this embodiment, a flange 105 (FIG. 1 or FIG. 2) having a substantially L-shaped section is formed on the fin 6 on the side where the fin pitch is coarse. Therefore, the fin 6 is formed by the flange 105.
When the refrigerant tube 3 is fitted into the tube fitting groove 5, the fin 6 does not bend, and the contact between the fin 6 and the tube 3 is improved as compared with the conventional one. The performance as a heat exchanger can be improved.

Next, the structure of the air inlet 1A of the fin 1 will be described.

Referring to FIG. 2, fin portions 6 having a relatively long length in the direction of the arrow and fin portions 7 having a relatively short length are alternately formed in air inflow portion 1A. More specifically, the end of the fin 7 on the side where air flows in is recessed from the end of the fin 6 on the side where air flows in, and a recess 8 is formed there.

The pitch P1 of the fin portions 6 is longer than the pitch P2 of the portion where the fin portions 6 and the fin portions 7 are mixed, and the pitch on the side of the air inflow portion 1A is set coarse. The tube fitting groove 5 is also formed on the side edge of the fin portion 7.

According to this embodiment, this heat exchanger 1
00 is configured as described above, so that even if frost occurs on the air inflow portion 1A side, the frost does not easily form a bridge between the plate-like portions 11 of the fins 1. Therefore, the frost does not form a bridge between the plate-like portions 11 and clogging of the fin 1 is suppressed. Therefore, the heat exchange performance is less deteriorated than the conventional continuous fin heat exchanger.

Further, in the fin 1 of the heat exchanger 100 of this embodiment, only the pitch of the fin 1 on the side of the air inflow section 1A can be made coarse, so that the pitch of the fin 1 on the side of the air outflow section 1B is different from the conventional one. If they are the same, it is possible to suppress the formation of a frost or a bridge in the air inflow section 1A while restricting the heat exchanger to the same size as the conventional one, and it does not hinder downsizing of the heat exchanger. In addition, since the processing to be added to the conventional flat plate 10 is only required to be a partial cutting process (the hatched portion in FIG. 3) of the flat plate 10, the structure is easy, the processing cost is not increased, and the bending process is troublesome. Hardly increases.
Therefore, the manufacturing cost is extremely low as compared with the conventional one.

Referring to FIG. 3, in this embodiment, there are two types of change in length from one side 10a to another side 10b of flat plate 10, La and Lb. However, for example, if the removal lengths of the respective removal portions 14 are A, B, and C and are changed to three or four types, heat exchangers having different lengths of the concave portion 8 can be manufactured. become.

FIG. 4 shows another embodiment. According to this embodiment, the width W of the aforementioned flange margin 103 (FIG. 3) is
When the fin 1 is bent in a wave shape, a flange 105 having a substantially U-shaped cross section is formed. Therefore, since the strength of the fins 6 is further enhanced by the flange 105, the fins 6 do not bend when the refrigerant tubes 3 are fitted into the tube fitting grooves 5, and the contact between the fins 6 and the tubes 3 is prevented. It is improved as compared with the conventional one, and the performance as a heat exchanger can be remarkably improved.

Although the flange 105 having a substantially L-shaped cross section or a substantially U-shaped cross section has been described, it is apparent that the present invention is not limited to this.

Further, as another embodiment, when the above-described flat plate 10 is bent along the portion 101 to be bent,
It is desirable to form a weak point (not shown) in the portion to be bent 101 so as to be easily bent. The weak point may be a notch provided in the flat plate 10 or a rib 51 provided so as to cross the bendable portion 101.
Notches may be provided.

[0028]

As is apparent from the above description, according to the present invention, the fin pitch on the air inlet side in the heat exchanger is made coarser than the fin pitch on the air outlet side, so that frost formation is suppressed. , Thereby preventing clogging.

According to the present invention, since the flange is formed on the fin on the side where the fin pitch is coarse, the strength of the fin is increased by this flange, and the refrigerant tube is fitted into the tube fitting groove. At this time, the fin does not bend, the degree of contact between the fin and the tube is improved as compared with the conventional one, and the performance as a heat exchanger can be improved. Further, the fin pitch is not disturbed when the refrigerant tube is fitted, so that the performance deterioration as a heat exchanger and the increase in pressure loss on the air side due to the disturbed fin pitch can be prevented.

Further, according to the present invention, the processing to be added to the flat plate is only partial cutting of the flat plate, so that the manufacturing is easy, the increase in processing cost is small, and the manufacturing cost is reduced to the conventional one. It is extremely cheap.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a detailed configuration of an air inflow portion of a fin.

FIG. 3 is a development view showing a configuration before bending a flat plate forming a fin.

FIG. 4 is a diagram corresponding to FIG. 3, showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fin 1A Air inflow part 1B Air outflow part 3 Refrigerant tube 5 Tube fitting groove 10 Flat plate 11 Plate part 12a First connection part 12b Second connection part 13 Opening 14 Removal part 100 Heat exchanger 101 Planned bending part 103 Flange Teens 105 flange

Claims (2)

[Claims] The present invention relates to a fin crest formed by waving and / or fins.
Alternatively, a groove for fitting a tube is provided in a valley, and in a heat exchanger manufactured by fitting a refrigerant tube into the groove, the fin pitch on the air inlet side of the heat exchanger is coarser than the fin pitch on the air outlet side. A heat exchanger characterized in that a reinforcing flange is formed on the fin on the side where the fin pitch is roughened. 2. A flat plate having a portion to be bent to bend in a wave shape is provided, and the other portion of the flat plate is changed so as to change the length to another side with respect to one side in the direction of the portion to be bent. A part of the side is removed leaving a margin for the flange near the part to be bent, and the flat plate is bent along the part to be bent, and the fin pitch on the other side is compared with the fin pitch on the one side. A corrugated fin having a reinforcing flange formed by the flange margin is formed on the fin on the side where the fin pitch is coarsened, and a tube fitting formed on the peaks and / or valleys of the corrugated fin is formed. A heat exchanger manufactured by fitting a refrigerant tube into a groove for insertion.