JPH04187990A - Heat exchanging device - Google Patents

Abstract

PURPOSE:To increase heat exchange efficiency by a method wherein a heat exchanger is formed such that the intermediate part in the direction of length of a tube is bent to form an approximate V-shape, and is disposed in an air flow passage in a state that it is formed approximately in a inverted V-shape the bent part of which is located on the windward side in the direction of an air flow. CONSTITUTION:When a heat exchange device is applicable for a heat exchange device used as an indoor machine for a room air conditioner, a vaporizer A is formed approximately in an inverted V-shape where a bent part 70 is positioned on the windward side in a direction W of a down air flow. After suction air uniformly passes the whole of a core part 70 of the vaporizer A with the aid of a fan C, it is discharged to the outside of a casing B. During discharge of suction air, air is heat-exchanged with a refrigerant passing through a tube 3 of a vaporizer and cooled. Bedewing water produced owing to condensation of flow air is adhered on the surface of the tube 3, the bedewing water is moved in the directions of headers on both sides along the tube by means of the energizing force of flow air. As a result, flying of water can be suppressed and when the size of the whole of a device is the same, the heat exchanger having a long length can be contained, whereby heat exchange performance can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a heat exchange device used, for example, as an indoor unit for a room cooler.

Conventional technology and issues Conventionally, as a heat exchange device for indoor units for room coolers, etc.
A tube expansion type evaporator, that is, a large number of thin plate-like fins are arranged in parallel with a predetermined gap, and a plurality of hairpin-shaped pipes are inserted through these fins,
A heat exchange device was used which included an evaporator that was expanded and tightly attached to the fins, and in which each end of the pipe was communicated with a U-shaped tube. .

However, in a heat exchange device using such a tube expansion type evaporator, there is a limit to the improvement in heat exchange efficiency.

Therefore, instead of the above thermal evaporator, it may be possible to use a so-called multi-flow type evaporator which has even better heat exchange efficiency. This type of heat exchanger consists of multiple flat tubes (13) as shown in Figures 9 and 10.
are arranged in parallel, fins (14) are arranged between adjacent tubes, and cylindrical hollow headers (11) and (12) are connected to both ends of each tube (13). In the same figure, (15) is a refrigerant inlet pipe;
(I6) is the same 80 tube, and (C') is a fan.

By the way, the indoor unit for a room air conditioner needs to be made as compact as possible in relation to the installation space. Therefore, for compactness, the evaporator (A') is the ninth
As shown in FIG. 1 and FIG. 10, it is often disposed in the air flow passage in the casing (B') at an angle with respect to the air flow direction.

However, even if the evaporator was installed at an angle, the entire structure remained bulky and could not sufficiently meet the demand for compactness. Although it is possible to make the evaporator more compact by shortening the length of the evaporator, this creates another problem: the heat exchange performance deteriorates.

This invention was made to solve the above-mentioned problems, and is a heat exchange device that can make the entire device more compact, or increase the heat exchange efficiency if the device is kept the same size. It is intended for the purpose of providing.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention has a plurality of flat tubes and fins arranged alternately, and a heat source connected to both ends of each tube or to a pair of hollow headers. A heat exchange device comprising a heat exchanger disposed in an air flow path, wherein the heat exchanger is bent into a substantially V shape at a longitudinally intermediate portion of the tube, and the heat exchanger is arranged in an air flow passage. It is characterized in that it is disposed in the airflow passage in a substantially inverted V-shape with the curved portion on the windward side or in a substantially V-shape with the curved portion on the leeward side with respect to the flow direction.

The working heat exchanger is arranged in the air flow passage in a substantially inverted V shape with the curved part on the windward side or in a substantially V shape with the curved part on the leeward side with respect to the air flow direction, so the lengths are the same. When such tubes are used, the apparent length of the heat exchanger at least in the air flow direction can be shortened, and the entire device can be made more compact. On the other hand, if the devices are the same size,
Heat exchange efficiency is increased because heat exchangers with long tube lengths can be accommodated.

EXAMPLE The present invention will be described below based on an illustrated example in which the present invention is applied to a heat exchange device used as an indoor unit for a room air conditioner.

In the heat exchange device shown in FIGS. 1 and 2, (B)
is a casing, (A) is an evaporator housed within the casing, and (C) is a fan disposed at the center below the evaporator.

The evaporator (A) has a pair of headers (1) (2) at both ends.
) is arranged and has a core portion (7) which is bent into an approximately inverted V shape when viewed from the side. This core part (7) consists of a plurality of flat tubes (3) arranged in parallel with a predetermined gap between them.
and fins (4) interposed in the air circulation gap between them.
It is made up of. The flat tube (3) is made of an extruded aluminum material, and is preferably a flat perforated extruded material called a so-called harmonica tube, which has a reinforcing wall inside for the purpose of improving pressure resistance. I need it. However, an electric resistance welded tube or the like may be used instead of such an extruded material. The fins (4) interposed between the adjacent tubes (3) are so-called corrugated fins bent in a meandering manner, and are brazed to the tubes (3).
).

The fins (4) are preferably formed by cutting and raising louvers, and may be wider than the tube (3) for the purpose of improving heat exchange efficiency.

A pair of headers (1) and (2) connected to both ends of the core portion (7) are each made of aluminum pipe material with a circular cross section. These headers (1) and (2) have tube insertion holes (la).
(2a) is drilled, and the insertion hole (la)
The ends of each of the tubes (3) are inserted into (2a), and are firmly and liquid-tightly connected by brazing.

The core portion (7) composed of the tube (3) and the fins (4) is bent into a substantially inverted V-shape when viewed from the side at a curved portion (70) in the middle of the length of the tube (3). ing.

Regarding the above-mentioned brazing, the headers (1) and (2) are formed from an electric resistance welded tube made of a plating sheet whose outer surface is coated with a brazing metal layer, and the fins (4) are formed from a plating sheet, respectively. Each header (1) (2)
In terms of improving productivity, it is extremely effective to temporarily assemble the tube (3) and fin (4), transport them into a vacuum heating furnace, etc., and then join them together using bracket brazing. desirable.

One end of one header (1) has a refrigerant inlet pipe (5
) is attached to the outer surface of the other end of the other header (2), and a refrigerant outlet pipe (6) is attached to the other end outer surface of the other header (2). Then,
As shown in Fig. 2, the refrigerant flowing in from the refrigerant inlet pipe (5) flows through the entire refrigerant passage composed of tubes (3) and flows out from the refrigerant outlet pipe (6).
3) It exchanges heat with the air flowing through the air circulation gap including the fins (4) formed therebetween, and evaporates.

As shown in FIGS. 1 and 2, the evaporator is arranged in the air flow passage in a roughly V-shape with the curved portion (70) located on the windward side with respect to the downward air flow direction W. ing.

In the heat exchange device shown in FIGS. 1 and 2, the fan (C)
As a result, the intake air passes evenly through the entire core portion (70) of the evaporator (A) and is then blown out to the outside of the cage jig (B). During this time, the air is cooled by exchanging heat with the refrigerant flowing through the tubes (3) of the evaporator. Moreover, by installing the evaporator (A) in a substantially inverted V shape with respect to the air flow direction as shown in the figure, there are particularly the following advantages. That is, condensed water resulting from condensation of the circulating air adheres to the surface of the tube (3), or this condensed water moves along the tube in one direction on both side headers due to the biasing force of the circulating air.

Therefore, it is possible to suppress so-called water splashing, in which the condensed water formed in the central part of the core part (70) is blown away by the circulating air, and there is an advantage that the condensed water can be smoothly discharged from the header parts at both ends.

FIG. 3 shows a second embodiment in which the structure of the evaporator is modified. This evaporator may have approximately the same configuration as the evaporator shown in FIGS. At the same time, a partition member (8) is provided in the middle of the header (1) in the length direction, and the refrigerant flowing from the artificial pipe (5) reaches the other header (2), and then passes through the U It turns and flows out from the outlet pipe (6).

4 and 5 show a third embodiment, in which the structure of the evaporator used is different from the above. That is, the bending part (
70), the tube (3) and fins (4) are divided into left and right parts, and an intermediate header (9) is provided at the curved part, and the divided end of the tube (3) is connected to the header (9). It is. Furthermore, the intermediate header (9
) are connected to the intermediate header (9) in an alternating arrangement in which the tube groups on both sides are shifted by half tube pinches. By configuring the evaporator in this way, the refrigerant flowing from one tube group is combined at one end at the intermediate header (9), stirred, and then flows out to the other tube group.
This has the advantage of improving heat exchange efficiency compared to the case where headers are present only at both ends.

FIGS. 6 and 7 show a fourth embodiment. In this embodiment, each tube (3) is twisted at a bending portion (70) to turn the front and back sides, thereby forming the evaporator into a substantially V-shape. By configuring the evaporator used in this way, the front side and the rear side of the refrigerant flow relative to the air flow, that is, the front side and the rear side in the width direction of the tube, change places at the bent part due to the twisting of the tube, so that the refrigerant temperature can be reduced. It has the advantage of being able to make it uniform and improve heat exchange efficiency.

In the above embodiments, the evaporator is arranged in a substantially inverted V-shape in the airflow passage, or as shown in FIG. It may be arranged in the airflow passage so as to form a shape.

In the embodiments shown in FIGS. 3 to 8, parts with the same names as those in the first embodiment shown in FIGS. 1 and 2 are given the same reference numerals, and the explanation thereof will be omitted.

Effects of the Invention As described above, the heat exchange device according to the present invention is a heat exchanger in which a plurality of flat tubes and fins are arranged alternately, and both ends of each tube are connected to a pair of hollow headers. , the heat exchanger is arranged in an air flow passage, the heat exchanger is bent into a substantially V shape at a longitudinally intermediate portion of the tube, and the heat exchanger is bent in a substantially V shape in the longitudinal direction of the tube, and On the other hand, it is characterized in that it is disposed in the air flow passage in a substantially inverted V shape with the curved portion on the windward side or in a substantially V shape with the curved portion on the leeward side. Therefore, by using a multi-flow type heat exchanger, the heat exchange performance can be improved compared to a tube expansion type heat exchanger. Moreover, since this multi-flow type heat exchanger is bent into a substantially V shape and is arranged in a substantially V shape or a substantially inverted V shape with respect to the air flow direction, it is different from a linear heat exchanger. Compared to this, if the length of the heat exchanger (tube length) is the same, at least the apparent length in the air flow direction can be shortened, and the size of the entire heat exchange device can be made compact. Furthermore, the position of the drain pan can be raised, making drain processing easier. On the other hand, if the overall size of the device is the same, a heat exchanger with a longer heat exchanger length (tube length) can be accommodated, so that the heat exchange performance can be increased.

[Brief explanation of the drawing]

FIG. 1 is a front view of a heat exchange device showing a first embodiment of the present invention, FIG. 2 is a perspective view showing a heat exchanger and fan used in the device of FIG. 1, and FIG. Embodiment 2 is a perspective view of a heat exchanger, FIG. 4 is a front view of a heat exchange device according to a third embodiment of the present invention, and FIG. 5 is a diagram of a heat exchanger used in the device of FIG. 4. A perspective view and FIG. 6 show a fourth embodiment of the present invention, a front view of the heat exchanger, FIG. 7 a plan view thereof, and FIG. 8 a heat exchange device according to a fifth embodiment of the present invention. 9 is a front view of a heat exchange device using a multi-flow heat exchanger that is not bent into a V shape, and FIG. 10 is a perspective view showing the heat exchanger and fan used in the device of FIG. 9. It is a diagram. (1) (2)...Header, (3)...Flat tube, (4)...Fin, (7)...Core part, (7o)...
・Bending part, Figure 6/U Figure 7-90-

Claims (1)

[Claims] A heat exchanger (in which a plurality of flat tubes (3) and fins (4) are arranged alternately, and both ends of each tube (3) are connected in communication with a pair of hollow headers (1) and (2). A), the heat exchanger (A) is disposed in an air flow passage, the heat exchanger (A) having a diameter of about V at a longitudinally intermediate portion of the tube (3). It is arranged in the air flow passage in a substantially inverted V shape with the curved part (70) on the windward side or in a substantially V shape with the curved part on the leeward side with respect to the air flow direction. A heat exchange device characterized by: