JPH0560481A - Heat exchanger - Google Patents

Abstract

PURPOSE:To improve drainage performance for dew water in the core unit of a heat exchanger by a method wherein flat type heat exchanging tubes are arranged in left-and-right direction in parallel, and corrugate fins are arranged between the heat exchanging tubes in a state that the fins are superposed with each other and draining corrugate plates are arranged between the corrugate fins so as to be interposed. CONSTITUTION:Tubes 1 are arranged vertically in parallel at predetermined intervals in the horizontal direction and the upper and lower ends of the tubes 1 are connected so as to communicate respectively with each other. A pair of corrugate fins 3 are arranged in respective clearances between tubes 1 in a condition that the bent directions thereof are vertical direction and a drainage corrugate plate 4 is sandwiched therebetween. Further, the drainage corrugate plate 4 are arranged in a state that the same is interposed between both corrugate fins 3 and the bent direction thereof is directed toward fore-and-aft direction. Dew water, adhering to the surfaces of the tubes 1 and/or the corrugate fins 3 during heat exchanging, flows down smoothly from the corrugate plates 4 toward the lower part of the heat exchanger along the flat surfaces 3a of the corrugate fins 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger made of metal such as aluminum used for an air conditioner or the like as an evaporator or a heat exchanger of a combined type which can be switched between an evaporator and a condenser. ..

[0002]

2. Description of the Related Art Recently, as a condenser, as shown in FIG. 6, a large number of flat tubes (51) are oriented horizontally and arranged in parallel in the vertical direction, and A heat exchanger called a so-called multi-flow type or parallel flow type, in which a pair of left and right hollow headers (52) (52) are connected in communication with both ends of these tubes (51), has a high heat exchange performance, It tends to be used favorably because it can realize ultra compactness. Incidentally, (53) is a corrugated fin, and (54) and (55) are pipe connecting pipe portions.

Recently, various attempts have been made to apply this multi-flow type heat exchanger to an evaporator.

However, unlike the condenser, the evaporator has a troublesome problem that condensed water is generated, and when the above-mentioned multi-flow heat exchanger is directly applied to the evaporator,
Since the tube (52) is placed horizontally, most of the dew condensation water generated in the core part during heat exchange is not discharged, and a large amount of water accumulates in the core part during heat exchange, creating ventilation. This causes a problem that resistance is increased and heat transfer performance is deteriorated.

Therefore, as shown in FIG. 7, it is conceivable to arrange the headers (52) and (52) vertically to form a multi-flow type evaporator in which the tubes (51) are oriented vertically. .. With such a structure, the drainage performance of the condensed water is certainly improved as compared with the case of the heat exchanger shown in FIG.

However, in this case, since the flow of the dew condensation water is obstructed by the corrugated fins (53), it is difficult to smoothly discharge the water, and the heat exchange efficiency is still not a perfect structure.

In view of the above-mentioned conventional drawbacks, the present invention significantly improves the performance of discharging condensed water in the core portion of the heat exchanger and realizes efficient heat exchange when it functions as an evaporator. It aims at providing the heat exchanger which can be.

[0008]

In order to achieve the above object, according to the present invention, a plurality of flat heat exchange tube portions are oriented in the up-down direction and arranged in parallel in the left-right direction, and the heat exchange tube portions are arranged in parallel. A pair of corrugated fins bent in a vertical direction between the corrugated fins are arranged so as to be overlapped with each other, and a corrugated drainage corrugated in a front-rear direction is bent between the corrugated fins. The gist of the heat exchanger is that the plates are arranged in an intervening state.

[0009]

In the above structure, since the heat exchange pipe portion is oriented in the vertical direction, the drainage of the condensed water is not obstructed by the heat exchange pipe portion. Moreover, between the heat exchange tubes,
A pair of corrugated fins bent in a vertical direction in a corrugated shape are arranged so as to be superposed on each other, and a drainage corrugated plate bent in a corrugated shape in the front-rear direction is arranged between both corrugated fins. By being arranged in the intervening state, the condensed water can flow down along the drainage corrugated plate, and the discharge of the condensed water is not obstructed by the fins. Therefore, the dew condensation water flows down smoothly, and high dew condensation water discharge performance is exhibited.

[0010]

EXAMPLES Next, examples in which the present invention is applied to a multi-flow type aluminum evaporator will be described.

According to the present invention, a so-called serpentine type heat exchanger in which a heat exchanger core is formed by bending a tube in a meandering shape, or a plate-shaped flat plate formed by combining a pair of molding plates together. The present invention can also be applied to a so-called laminated heat exchanger in which tube elements are arranged in a laminated state. Further, the present invention is not limited to being used as a heat exchanger exclusively used for an evaporator, but may be applied to a heat exchanger of a combined type that functions as an evaporator and a condenser by switching.

In the multiflow evaporator shown in FIGS. 3A and 3B, (1) is a flat tube made of aluminum, (2) and (2) are hollow headers made of aluminum, and (3) is also made of aluminum. Corrugated fins,
Similarly, (4) is an aluminum drainage corrugated plate. These heat exchanger constituent members are assembled in a temporarily assembled state and joined and integrated by collective brazing. Incidentally, (5) is a refrigerant inlet pipe, and (6) is the same outlet pipe.

The flat tube (1) is made of an extruded mold material, and as shown in FIGS. 1 and 2, the interior is divided into a plurality of chambers by partition walls to enhance the heat transfer performance.
With a so-called harmonica tube. The cross-sectional dimensions are set such that the width t _b is 16 mm and the thickness t _t is 2 mm. As the tube (1), an electric resistance welded tube may be used in addition to the extrusion mold material. These tubes (1) are oriented in the up-down direction and are arranged in parallel in the left-right direction at predetermined intervals. The distance i is, for example, 20.
It is set to 2 mm.

The hollow headers (2) and (2) have a cylindrical shape in which an aluminum brazing sheet having a brazing material layer clad on one or both sides is formed into a pipe shape, and both side edges thereof are abutted with each other. A structure is used in which the openings at both ends of the header pipe are closed with a header cap made of aluminum. The both side edge portions are joined together during collective brazing of the heat exchanger constituent members. An extruded mold material and an electric resistance welded pipe may be used as the header. These headers (2) and (2) are in a horizontal state and are connected to the upper and lower ends of the tube (1) so as to communicate with each other.

The corrugated fin (3) is formed by bending an aluminum brazing sheet having a width substantially the same as the width of the tube (1) into a corrugated shape in the lengthwise direction, and the length in the bending direction is As shown in FIG. 1, it is made slightly shorter than the length of the tube (1). The corrugated fin (3) is, as shown in FIG.
Within each gap between the tubes (1), a pair of drainage corrugated plates (4) are sandwiched and arranged in a stacked manner. The flat plate portion (3a) of the corrugated fin (3) is provided with a slit (3c) formed by cutting and raising the louver.

The drainage corrugated plate (4) is an aluminum sheet having substantially the same length as the corrugated fins (3) bent in a corrugated shape in the width direction thereof, and the width in the bent direction is the first. As shown in the figure, like the corrugated fins (3), the width of the tube (1) is substantially the same. The height p _h of the corrugated plate (4) needs to be set as low as possible so as not to obstruct the flow of air flowing through the heat exchanger in the front-rear direction and high enough to allow good drainage of condensed water. There is. Specifically, it is set to 2 mm, for example. As shown in the figure, the drainage corrugated plate (4) is disposed between the corrugated fins (3) and (3) with the bending direction facing forward and backward.

In the evaporator having the above structure, during heat exchange, the condensed water adhering to the surfaces of the tube (1) and the corrugated fins (3) travels along the flat plate portion (3a) of the corrugated fins (3). It goes toward (4) and smoothly flows down the corrugated plate (4) to the lower part of the heat exchanger without any trouble. Therefore, efficient heat exchange can be realized without causing a large decrease in heat exchange performance due to dew condensation water as in the conventional case.

Further, by adopting the unique fin structure as described above, it is possible to put the multi-flow type evaporator into practical use.

Further, even when the dew condensation water is used in an environment where the dew condensation water freezes, the defrosting time can be shortened due to the small amount of the condensation water remaining in the core portion.

As shown in FIG. 4, the rear edge portion (4a) of the corrugated plate (4) is made to project rearward from the rear edge portion of the corrugated fin (3). The flat plate portion (3a) of the corrugated fin (3) by the air passing through the heat exchanger core in the front-back direction during heat exchange.
Condensed water that moves upward toward the rear is guided to the protruding rear edge portion (4a) side by the action of surface tension, and flows down along the protruding edge portion (4a). Therefore, it is possible to prevent the condensation water from being blown off.

In the embodiment shown in FIG. 5, the corrugated fins (3) and (3) and the drainage corrugated plate (4) are bent at an acute angle, and the bending angle θ of the drainage corrugated plate (4). ₁ is the bending angle θ _{0 of} the corrugated fins (3) (3)
Is set smaller than. For example, in this way,
Equivalent diameter d (= 4 · A by the drainage corrugated plate (4)
/ P, A: cross-sectional area of passage, P: length of wet edge) or its fin pitch is set smaller than that of the corrugated fins (3) and (3), so that dew condensation water is caused by surface tension. It is positively drawn toward the drainage corrugated board (4), and the drainage performance is further improved. In addition,
In addition, when only the drainage corrugated board (4) is bent into a corrugated shape at an acute angle, or the corrugated fin (3)
Only (3) may be bent into a corrugated shape at an acute angle.

[0022]

As described above, the heat exchanger of the present invention is
A plurality of flat heat exchange pipe parts are oriented in the up-down direction and arranged in parallel in the left-right direction, and between the heat exchange pipe parts, a pair of corrugates bent in the up-down direction in a corrugated shape. Since the fins are arranged so as to be overlapped with each other, and a corrugated plate for drainage, which is bent in a corrugated shape in the front-rear direction, is arranged between both corrugated fins, the heat exchanger is disposed. When the heat exchanger is made to function as an evaporator, the dew condensation water flows down smoothly with the core part of the heat exchanger downward, so that there is little dew condensation water that accumulates in the core part during heat exchange, resulting in efficient heat exchange. Can be realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view of a core portion of a heat exchanger.

FIG. 2 is a horizontal sectional view of a heat exchanger core.

3A and 3B show the overall configuration of a heat exchanger, wherein FIG. 3A is a front view and FIG. 3B is a side view.

FIG. 4 is a horizontal sectional view of a heat exchanger core according to a modification.

FIG. 5 is a sectional perspective view of a core portion of a heat exchanger according to another embodiment.

FIG. 6 is an overall front view showing a conventional heat exchanger.

FIG. 7 is an overall front view showing another conventional heat exchanger.

[Explanation of Codes] 1 ... Flat tube (heat exchange tube portion) 3 ... Corrugated fin 4 ... Corrugated plate

Claims (1)

[Claims] 1. A plurality of flat heat exchange tube portions are oriented in the up-down direction and arranged in parallel in the left-right direction,
A pair of corrugated fins that are bent in a corrugated shape in the vertical direction are arranged between the heat exchange tube portions in a superposed manner, and are bent in a corrugated shape in the front-rear direction between the corrugated fins. A heat exchanger, characterized in that the drainage corrugated plate is disposed in an interposed state.