JPS63197893A - Layered type heat exchanger - Google Patents

Abstract

PURPOSE:To restrict a reduction in the efficiency of heat exchanging operation as much as possible by a method wherein a group of thermal conducting pipes positioned at the inlet of a heat exchanging fluid and a group of thermal conducting pipes are arranged in a zig-zag form above both groups of thermal conducting pipes are connected in series alternatively. CONSTITUTION:All the thermal conducting pipes in a group 1A of thermal conducting pipes are always kept with heat exchanging fluid (a) which do not perform heat exchanging operation yet and which have a high heat exchanging performance. In turn, the thermal conducting pipes belonging to a group 1B of the thermal conducting pipes show a small degree of heat exchanging operation through the thermal conducting pipes of the group 1A of the thermal conducting pipes position upstream as compared with those positioned downstream of the series of flow passages. That is to say, they come into contact with the more fresh heat exchanging fluid (a), each of a plurality of thermal conducting pipes 1A and 1B may perform the maximum heat exchanging work and then the heat exchanging performance of all the layered type heat exchanger is drastic improved. Since one of a group 1A of the thermal conducting pipes and one of a group 1B of the thermal conducting pipes are alternatively connected, the distribution of temperature in a forward and rearward flowing direction in the heat exchanging fluid (a) is made uniform and then a high efficiency can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a stacked heat exchanger such as a heat exchanger for use by being incorporated into, for example, a VJ heavy-duty air conditioner.

[Prior Art] FIGS. 3 and 4 illustrate the structure of the above-mentioned conventional content. This refrigerant has a plurality of flat transmission lines that form a refrigerant flow path (b) between a pair of tank parts 11 and 12 that are placed opposite each other at a predetermined interval and serve as refrigerant inlet and outlet ports. The heat tubes 1A group and 1B group are divided into two rows on the inflow side and outflow side for cooling +fil and placed in parallel with a heat exchange gap A interposed as a passage for cooling air (a). It consists of a hanging part and a tank part connected to it. 6 is a fin for increasing the heat transfer area attached to the heat exchange gap A.

The operation of the condenser υ is such that high-temperature, high-pressure gas phase refrigerant discharged from the compressor of an air conditioner (not shown) flows into the inlet tank section 12 via the refrigerant inlet vibrator 14, and is then dispersed into each heat transfer tube. Follow the inside of 1A and 1B and exit tank section 13
During the process, it is cooled and liquefied by cold air (A) blown by a blower (not shown).

[Problems to be Solved by the Invention] In the conventional condenser having the above-described structure, the heat transfer tube 1A shown by the arrow in the figure and arranged on the upstream side of the cooling air
The high-temperature refrigerant flowing inside is effectively cooled because a sufficient temperature difference is maintained between it and the cooling air. However, the refrigerant that travels inside the heat transfer tubes 1B located on the downstream side exchanges heat with the heated wind by coming into contact with the upstream heat transfer tubes 1A group, and the temperature difference between the refrigerant and the cooling air is reduced. Therefore, it is not possible to perform an efficient cooling effect. In other words, the heat exchanger tubes on the downstream side are not fully utilized.

The present invention provides a stacked heat exchanger having a structure incorporating heat transfer tubes arranged in multiple rows on an inflow side and an outflow side of a heat exchange fluid. It is an object of the present invention to provide a laminated heat exchanger having a structure that can minimize the decrease in .

[Means for Solving the Problems] In order to achieve the above object, the stacked heat exchanger according to the present invention includes a plurality of heat exchanger tubes arranged in parallel with heat exchange gaps interposed therebetween. It has a structure in which a pair of sealed tubes are bridged and connected between the inlet and outlet tank portions of the fluid to be heat exchanged, and the heat exchange fluid is directed in a direction intersecting the tube axis direction of the heat exchanger tube, In the laminated wall heat exchanger configured to pass through the heat exchange gap, the plurality of heat transfer tubes include a first heat transfer tube group located on the inflow side of the heat exchange fluid and a first heat transfer tube group located on the outflow side of the heat exchange fluid. The second heat exchanger tube group is arranged such that the arrangement of each tube group in the cross-sectional direction is staggered, and the first silk inlet/outlet tank portion is arranged so that the heat exchange fluid is transferred to the second heat exchanger tube group. one of the heat tube groups and the second heat exchanger tube l! A structure is adopted in which one of the heat transfer tubes f can pass through the heat exchanger H in an alternating current H, and a fluid flow path corresponding to the plurality of heat transfer tubes connected in series is formed.

[Operation and Effects of the Invention] In the stacked heat exchanger having the above configuration, one of the first heat exchanger tube group and one of the second heat exchanger tube group are in a fluid state. They are connected in pairs through the inlet and outlet tank sections. The sets of heat transfer tubes are connected in such a way that a serial flow path is formed through the fluid inlet/outlet tank section.

All of the heat exchanger tubes constituting the first heat exchanger tube group are always kept in contact with a fresh heat exchange fluid with a high heat exchange capacity that has not yet undergone heat exchange.

On the other hand, as the heat exchanger tubes belonging to the second heat exchanger tube group are located on the downstream side of the above-mentioned series of flow paths, the temperature of the heat exchange fluid that follows the inside of the tubes approaches the temperature of the heat exchange fluid. That is, since the degree of heat exchange is progressing, in order to further advance heat exchange, it is necessary to maintain the temperature difference between the heat exchange fluid and the heat exchange fluid as large as possible.

Therefore, among the heat exchanger tubes belonging to the first heat exchanger tube group, the more downstream the heat exchanger tubes are located in the above-mentioned series of flow paths, the better the heat exchange is performed with the fluid to be heat exchanged that follows the inside of the tubes. temperature should be close to that of the operating fluid.

According to the configuration of the present invention, such necessary conditions are almost satisfied, so that the heat exchanger tubes belonging to the second heat exchanger tube group are located on the downstream side of the series of flow paths, the more the heat exchanger tubes are located on the upstream side. The heat exchange fluid is exposed to a fresher heat exchange fluid that undergoes less heat exchange by the first heat exchanger tube, so to speak.
Each of the plurality of heat exchanger tubes can perform the maximum heat exchange work, and the heat exchange capacity of the stacked heat exchanger as a whole is greatly increased.

Also, one of the first heat exchanger tube group and the second heat exchanger tube 6Y
By providing piping grooves that are alternately connected to one of the pipes, the effect of making the temperature distribution between the front and back parts more even in the flow direction of the heat exchange fluid is created, and the heat exchange efficiency is further increased. It will be done.

Furthermore, since the flat tubes are arranged in a staggered manner in the cross-sectional direction, a flow channel constriction effect occurs in the heat exchange gap, increasing the flow velocity of the heat exchange fluid, and also creating a labyrinth formation effect. The heat exchange performance is also improved by the occurrence of heat exchange.

[Example] The configuration of the present invention will be specifically described below based on an example shown in the drawings.

FIG. 1 is a partially cutaway perspective view of a condensing rack for use in an automatic heavy-duty air conditioner as an embodiment of the laminated heat exchanger according to the present invention.

The general structure of the condenser consists of an inlet tank part B for a high-temperature, high-pressure gas phase refrigerant as a heat exchange fluid and an outlet tank part C placed opposite each other with a predetermined distance apart, and a group of a plurality of heat transfer tubes.
A hook is connected between these two tank parts B and C in a parallel state with a heat exchange gap A interposed therebetween.

The names of the artificial tank part and the outlet tank part are given here for convenience, and in reality, the refrigerant population and the outlet coexist in both tank parts.

The heat exchanger tube group is made of aluminum or copper, which has high thermal conductivity, and is a straight tube with a flat cross-sectional shape that resembles a crushed circular pipe.

These tube groups are connected to the first tube located on the inflow side to the heat exchange gap A, which serves as a passage for the cold air (a) as the heat exchange fluid.
a group of heat exchanger tubes 1A, and a second heat exchanger tube 1B located on the outflow side.
As shown in FIG. 1, each group of tubes is arranged in a staggered arrangement in the cross-sectional direction.

The inlet tank part B and the outlet tank part C have a laterally symmetrical shape and have the same structure and dimensions. The inlet tank part B has a large group 4 that communicates with the heat exchanger tube groups 1A and 1B.
A base plate 4 in which A is provided in the above staggered arrangement.
, one heat exchanger tube of the heat exchanger tube 1A group, and heat exchanger tube 1B
Bonding of tank plate 2 with eight groups of heat transfer tube connecting portions 2 protruding from one group of heat transfer tubes to form a series of refrigerant flow paths (b) by connecting heat transfer tubes in one group alternately in series. It is made up of.

One end of each of the heat exchanger tubes 1A and 1B is brought into contact with the base plate 4 so as to close the connection hole 4A, and is fixed to the base plate 4 by brazing.

The same goes for the other tube end.

Both the base plate 4 and the tank plate 2 are made of a metal plate such as an aluminum plate, and the heat exchanger tube connecting portion 2A having a shape that resembles a broken 2-shape is formed by pressing the tank plate 2.

At the upper end and FcM of the heat exchanger tube connecting portions 2A arranged in the vertical direction, there are refrigerant inlet vibe joints 1 that respectively constitute the inlet boat and the outlet boat of the above-mentioned series of refrigerant flow paths (b). and a refrigerant outlet vibe joint 8 are provided, respectively. Reference numerals 10 and 9 are refrigerant inlet/outlet levers.

Similarly to the inlet tank part B, the outlet tank part C is made by joining the base plate 5 and the tank plate 3 by brazing. On the heat exchanger tube 1A, a fin 1C having a width approximately equal to the width in the flat direction of the heat exchanger tube 1A is provided to protrude in the flat direction of the tube as shown in the figure, simultaneously when the heat exchanger tube 1A is extruded. .

Similarly, fins 1D are provided on the heat exchanger tube 1B.

In the heat exchange gap A group, corrugated fins 6 for increasing the heat exchange area, each made by bending and loading a thin aluminum plate, are provided between each heat exchanger tube 1A or 1B and the fin-like fin 1C or 1D. It is attached by being sandwiched between the two and fixed by brazing.

Next, the operation of the above capacitor will be explained. High-temperature, high-pressure gas phase refrigerant discharged from a compressor of an air conditioner (not shown) flows from the refrigerant inlet vibe 9 into the heat transfer tube 1B located at the top of the inlet tank section B, and is directed toward the outlet tank section C. While following the flow path (b), it is cooled by exchanging heat with the cold air (a) blown from a feeder (not shown).

The refrigerant in the outlet tank portion C1,:I is transferred to a heat exchanger tube connecting portion (similar to the aforementioned connecting portion 2A provided in this tank portion).
(not visible in the diagram),
A [J-turn is made toward the heat exchanger tube 1A located at the top stage.

Since fresh cold air (A) is blown onto the heat transfer pipe 1121A, the refrigerant flowing inside this pipe is sufficiently efficiently cooled. The refrigerant that has reached the other end of the heat exchanger tube 1A makes a U-turn again in the uppermost heat exchanger tube connecting section 2'A of the inlet tank part B, moves to the second heat exchanger tube 1B from the uppermost stage, and traces inside this tube. In the meantime, the cooling capacity of the cold 1 has decreased somewhat due to heat exchange with the heat exchanger tube IA located on the side of the cold air flower.
! ! It is cooled by l.

The refrigerant that has reached the tank portion C, as described above, makes a no-turn and moves to the second heat exchanger tube 1A from the top, and is sufficiently cooled by being exposed to fresh cold air (a) again.

Similarly, the first heat exchanger tube I located on the cold air inflow side
One of the AIJ and the heat exchanger tube IBBY located on the outflow side
The heat exchanger tube 1A is located at the top stage and is connected to the refrigerant outlet vibrator 10, while alternately passing through one of the refrigerant tubes 1A.

The most important condition for increasing heat exchange efficiency in a heat exchanger is to keep the temperature difference between the fluid to be heat exchanged (refrigerant) and the heat exchange fluid (chilled air) as large as possible. The refrigerant flows through the refrigerant flow path (
(b) Although the temperature is high at the inlet part of heat exchanger tubes IA and 1,
As the air passes through Group B one after another, heat exchange becomes uniform, and by the time it approaches the outlet, the temperature difference between it and the cold air has narrowed considerably.

Therefore, it is extremely important to expose the refrigerant to fresh, cold air that does not raise the temperature even near the end of the heat exchange refrigerant flow path (b) in order to maximize the performance of the heat exchanger. However, in this embodiment, "Ndenri" has such a request as 1
This means that the structure is sufficient to meet the demand.

In addition, by adopting a configuration in which the entire heat exchange area through which the cold air (a) passes is filled with a series of U-turn refrigerant channels (b), the temperature distribution of the refrigerant becomes more even throughout this area. As a result, the entire heat exchange area performs the heat exchange work in a manner similar to that of the heat exchange area, and the cold energy retained in the cold air can be utilized to the maximum.

However, in the conventional condensers shown in Figures 3 and 4, there is a clear difference in refrigerant temperature between the front and rear areas of the heat exchange area, making it impossible to sufficiently increase the heat exchange efficiency of the entire condenser. Can not.

FIG. 2 is a partially exploded perspective view showing a capacitor similar to the above embodiment as a second embodiment of the present invention.

The difference from the first embodiment is that the inlet and outlet tank sections 13
and in the structure of C. Inlet tank part B is heat exchanger tube 1A
A heat exchanger tube connecting portion 2B for connecting two heat exchanger tubes located adjacent to each other in the vertical direction among each group of the group and the group 1B.
The group is connected to the base plate 4 by brazing. In addition, the outlet tank portion C connects one tube end of each of the four heat transfer tubes located adjacent to each other in the vertical and horizontal directions among the heat transfer tubes belonging to the heat transfer tube 1A group and the heat transfer tube group 1B, respectively. A group of heat exchanger tube connecting portions 2C each having a parallelogram-like shape are joined to the base plate 5 by brazing. Both connecting parts 2B
and 2C are made by press-molding a metal plate.

By giving such a structure to the refrigerant inlet/outlet tank parts B and C, there is a complex structure in the outlet tank part B that intersects between the four heat transfer tubes, as shown by the arrows in the figure. A communication path is created. For this reason, the flow path of the refrigerant that travels between the first heat exchanger tube 1A group and the second heat exchanger tube 18 group and goes from the population side to the outlet side of the refrigerant flow path (b) becomes considerably complicated. The effect of equalizing the refrigerant temperature distribution described above is further enhanced. In addition, refrigerant inlet/outlet tank part B
The positional relationship between the heat transfer tube connecting parts 2B and 2G to be installed in the heat transfer tubes 2B and 2G may be reversed. The structure of the heat exchanger according to the present invention is not limited to the above-mentioned condenser, but can be applied to various other heat exchangers having the same type of structure.

[Brief explanation of the drawing]

Figures 1 and 2 are a partially cutaway perspective view of a first embodiment capacitor with partially different design specifications, and a portion of a second embodiment capacitor, which is used by incorporating it into an automatic small air conditioner. It is an exploded perspective view. . Figures 3 and 4 show an example of a conventional 'Ndenri.
They are a front view and a partially cutaway perspective view, respectively.

Claims (1)

[Scope of Claims] A plurality of heat exchanger tubes are connected in a parallel state with a heat exchange gap interposed between a pair of opposed inlet and outlet tank portions for a fluid to be heat exchanged. In the stacked heat exchanger, the stacked heat exchanger is configured such that the heat exchange fluid passes through the heat exchange gaps in a direction intersecting the tube axis direction of the heat exchange tubes. The heat exchanger tubes include a first heat exchanger tube group located on the inflow side of the heat exchange fluid and a second heat exchanger tube group located on the outflow side, such that the cross-sectional arrangement of each of these tube groups is staggered. The set of inlet/outlet tank portions are configured such that the fluid to be heat exchanged alternately flows between one of the heat exchanger tube groups and one of the second heat exchanger tube group. 1. A stacked heat exchanger characterized by having a structure in which a fluid flow path corresponding to the plurality of heat transfer tubes connected in series is formed.