JPH11281279A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a higher heat exchange efficiency by forming vortex generating cut erection parts especially in a flow area after a heat exchanger tube to activate air passing through the flow area after the heat exchanger tube of a heat exchanger during the passage of air for heat exchange through the heat exchanger tube in a heat exchanger. SOLUTION: There are arranged a heat exchanger tube 2 in which a fluid is fluidized and a plurality of flat fins 1 which are arranged parallel at a fixed interval and inserted into the heat exchanger tube 2 so as to fluidize the fluid therebetween. Vortex generating cut-and-erected parts 5 are formed on the surfaces of the plate fins 1 after or before the heat exchanger tube 2 with respect to the direction of fluidizing air fed. Moreover, the vortex generating cut-and-erected parts 5 are given an elevation of 20 deg.-45 deg. with respect to the stream of the gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin-and-tube heat exchanger widely used in the field of refrigeration and refrigeration, such as air conditioners and refrigerators, and air conditioning, in which a vortex generating member is effectively added to the heat exchanger. And a heat exchanger that promotes heat exchange performance.

[0002]

2. Description of the Related Art In a fin-and-tube heat exchanger conventionally used for refrigeration / refrigeration, air-conditioning equipment, etc., the following measures have to be taken in order to efficiently transmit a cold heat source from a heat transfer tube to mainstream air. Has been taken.

1) The fin surface is formed in a corrugated shape or the like to increase the heat transfer area.

[0004] 2) As shown in JP-A-60-060495 and JP-A-63-61893, a cut-and-raised portion is formed on the fin surface to reduce an area where heat transfer is reduced on the fin surface. Let it.

3) A method of adding energy to the heat exchanger (for example, oscillating the heat exchanger, oscillating the mainstream air, etc.) and destroying a region where the heat transfer is reduced is taken. As a result, there has been proposed a device with less decrease in heat transfer performance.

[0006]

However, in the above-mentioned prior art, when the mainstream air passes through the heat transfer tube, an area with a small flow (stagnation area, that is, dead water area) is formed particularly in the downstream area. However, there is a problem that the deterioration of the heat conversion performance cannot be avoided.

Therefore, the present invention has been made based on the above-mentioned problem. By forming a vortex-generating cut-off portion in the downstream region of the heat transfer tube, the present invention is directed to the formation of air passing through the downstream region of the heat transfer tube of the heat exchanger. Activation is intended to promote heat conversion efficiency.

[0008]

According to the first aspect of the present invention,
Air blown in a heat exchanger including a heat transfer tube through which a fluid flows and a plurality of flat fins arranged in parallel at regular intervals and inserted into the heat transfer tube so that gas flows between each other. Behind the heat transfer tube for the flow of
A heat exchanger characterized in that a vortex generating and cutting portion is formed on the flat plate fin surface.

According to a second aspect of the present invention, the vortex generating and cutting portion has an angle of attack of 20 to 45 ° with respect to the flow of the blown air. It is an exchanger.

According to a third aspect of the present invention, the vortex generation and cut-out portion is arranged such that the center of the heat transfer tube is kept symmetrically at a certain distance.
The heat exchanger according to claim 1, wherein the heat exchanger is paired.

The invention according to claim 4 is characterized in that the adjacent vortex generating and cutting portions are alternately cut and raised on the front and back of the flat plate fin surface. It is an exchanger.

According to a fifth aspect of the present invention, there is provided the heat exchanger according to any one of the first to fourth aspects, wherein the surface of the flat plate fin is subjected to a hydrophilic treatment.

The invention according to claim 6 is the heat exchanger according to claim 5, wherein the surface of the downstream air outflow area of the flat plate fin is subjected to a hydrophilic treatment.

According to the first aspect of the present invention, a cut-and-raised portion for forming a vortex in the downstream region of the heat transfer tube with respect to the main air flow path is formed on the flat fin surface constituting the heat exchanger. ,
When the mainstream air passes between the fins, the stagnation region at the rear of the heat transfer tube is more activated to promote heat transfer.

According to the second aspect of the present invention, since the cut-and-raised portion has a certain angle (20 to 45 °) with respect to the mainstream air, the mainstream air can be efficiently activated without increasing pressure loss. Is possible.

According to the third aspect of the present invention, since a pair of the heat transfer pipes are symmetrically arranged at a certain distance from the center of the heat transfer pipe, the air in the dead water area downstream of the heat transfer pipe is activated. Will be more reliable.

According to the fourth aspect of the present invention, since the adjacent cut-and-raised portions are disposed on the fin surface such as front and back, the heat transfer tubes on both surfaces (back and front) of the fin. The activation of the air in the downstream region is efficiently promoted.

According to the fifth aspect of the present invention, since the fin surface of the path through which the air passes through the heat exchanger is subjected to the hydrophilic treatment, the pressure loss of the mainstream air due to the accumulation of condensed water is increased. Activation is efficiently promoted without the need.

According to the sixth aspect of the present invention, since the fin surface on the leeward side (downstream from the heat transfer tube) of the path through which the air passes through the heat exchanger is subjected to the hydrophilic treatment, the pressure loss of the mainstream air is reduced. Activation is efficiently promoted without increasing.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat exchanger according to each embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view of a fin of a heat exchanger according to a first embodiment of the present invention, and FIG. 2 is a plan view of the heat exchanger shown in FIG.

In FIG. 1, reference numeral 1 denotes a flat plate fin, which is formed of, for example, thin aluminum. Reference numeral 2 denotes a copper heat transfer tube into which a refrigerant such as freon gas flows, 3 denotes a collar hole provided in the plate fin 1 for inserting the heat transfer tube 2 into the plate fin 1, and 4 denotes a fin surface. This is a louver part which is cut in the slit shape on the top and step-molded in both directions (front and back).

The heat exchanger includes a plurality of flat fins 1
After the heat transfer tubes 2 are inserted into the collar holes 3 of each plate fin 1 in parallel with each other so that air flows between them, the plate fins 1 are fixed to the heat transfer tubes 2 by expansion or the like.

According to the above configuration, the heat source of the refrigerant flowing in the heat transfer tube 2 passes between the fins 1 and 1 arranged in parallel from the heat transfer tube 2 via the collar hole 3 and the flat plate fin 1 pressed against the heat transfer tube 2. Transfer of heat is performed by the temperature difference with the passing air.

When the heat exchanger is used as an evaporator, since the temperature inside the heat transfer tube 2 is set low, the air flowing into the heat exchanger is cooled and Moisture in the air is condensed. Further, when used as a condenser, since the temperature inside the heat transfer tube 2 is set high, the air flowing into the heat exchanger is heated.

As shown in FIG. 3, the flow of the mainstream air passing through the surface between the fins 1 and 1 in a general heat exchanger flows from the front surface of the heat transfer tube 2 along the outer periphery of the heat transfer tube 2 and thereafter. Immediately after the heat transfer tube 2, a dead water zone that has not flown and forms a stagnant water is flowing.

Therefore, as shown in FIGS. 1 and 2, by forming a pair of vortex generating and cutting portions 5 in the downstream area of the heat transfer tube 2, mainstream air flowing along the outer periphery of the heat transfer tube 2 is formed. Forms a vertical vortex when passing through the vortex generating and cutting part 5. At this time, a part of the flow flows into the dead water area, the air is activated, and heat exchange in the downstream area of the heat transfer tube is promoted.

Therefore, in the heat exchanger according to the first embodiment, it is possible to promote heat exchange with the air at the fins without adding special energy.

As shown in FIG. 4, the vortex generating and cutting portion 5 is inclined with respect to the
An angle of attack of up to 45 °, more suitably an angle of attack of 15 to 30 °, and, as shown in FIG. 2, a certain distance (almost the outer diameter of the heat transfer tube 2) with respect to the center of the heat transfer tube 2. It is good to have a structure formed by forming a pair while maintaining the above.

As described above, by providing the vortex generation cut-out portions 5 with an angle of attack and disposing them in a pair, the vortex generation cut-out portions 5 allow the air passing between the plate fins in the downstream area of the heat transfer tube 2. Activation can be made more reliable.

Second Embodiment FIG. 5 is a side view of a main part of a heat exchanger according to a second embodiment of the present invention. In the second embodiment, only differences from the first embodiment will be described. FIG. 5 shows a state viewed from the upstream side of the mainstream air.

In the heat exchanger according to the second embodiment, one of the pair of vortex generation cut-and-raised portions 5 formed on the downstream side of the heat transfer tube 2 as shown in FIG. The rest is cut and raised on the lower surface side of the flat plate fin 1 and molded.
It is possible to activate mainstream air in the dead water area generated on the back surface).

Third Embodiment FIG. 6 is a sectional view of a heat exchanger according to a third embodiment of the present invention. In the present embodiment, only points different from the above-described first embodiment will be described.

In the heat exchanger according to the fourth embodiment, the entire surface of the plate fin 1 is subjected to a hydrophilic treatment to condense water to a complicatedly formed portion (the vortex generating and cutting portion 5). Can be prevented by increasing the flow path loss of the mainstream air due to stagnation.

Fourth Embodiment FIG. 7 is a sectional view of a heat exchanger according to a fourth embodiment of the present invention. In this embodiment, only portions different from the above-described fifth embodiment will be described.

The heat exchanger according to the fourth embodiment performs a hydrophilic treatment on the mainstream air leeward portion 1a of the flat plate fin 1 so that condensed water stays in a complicatedly formed portion. It is possible to prevent an increase in air flow path loss, and to prevent a further decrease in heat conversion efficiency.

[0037]

As described above, according to the first aspect of the present invention,
According to the described heat exchanger, air can be activated in the dead water area generated downstream of the heat transfer tube at the vortex generation and cut-off portion, and the improvement of heat conversion efficiency can be promoted, and the productivity can be improved. Low cost can be achieved.

Further, according to the heat exchanger of the second aspect of the present invention, the activation of the air in the dead water area can be made more reliable by having the angle of attack in the vortex generating and cutting part. it can.

Further, according to the heat exchanger according to the third aspect of the present invention, since the vortex generation and cut-out portions are arranged in a pair, the air can be activated in the dead water area from both sides of the heat transfer tube. As a result, the efficiency of heat conversion to mainstream air can be further promoted.

In addition, according to the heat exchanger of the fourth aspect of the present invention, since the vortex generation and cut-out portions are formed on both surfaces of the fin, further activation of air can be promoted.

In addition, according to the heat exchanger according to the fifth aspect of the present invention, stagnation of condensed water on the surface of the flat plate fins can be suppressed, and extremely large loss of gas flow path can be prevented.

In addition, according to the heat exchanger of the sixth aspect of the present invention, it is possible to suppress the accumulation of condensed water on the surface of the flat plate fin and to minimize the deterioration of the heat conversion performance due to the hydrophilic treatment. it can.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a plate fin of a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a plan view of a flat plate fin of the heat exchanger of FIG.

FIG. 3 is a plan view of a plate fin in a general heat exchanger.

FIG. 4 is a sectional view of a main part of a plate fin of the heat exchanger taken along line AA of FIG. 2;

FIG. 5 is a side view of a main part of a flat fin of the heat exchanger according to the second embodiment of the present invention.

FIG. 6 is a plan view of a plate fin of the heat exchanger according to the third embodiment of the present invention.

FIG. 7 is a plan view of a flat plate fin of a heat exchanger according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat plate fin 2 Heat transfer tube 3 Collar hole 4 Louver part 5 Vortex generating and cutting part

Claims (6)

[Claims] 1. A heat exchanger comprising: a heat transfer tube through which a fluid flows inside; and a plurality of flat plate fins arranged in parallel at regular intervals and inserted into the heat transfer tube so that gas flows between each other. A heat exchanger characterized in that a vortex-generating cut-off portion is formed on the flat plate fin surface behind the heat transfer tube with respect to the flow of blown air. 2. The heat exchanger according to claim 1, wherein the vortex generating and cutting part has an angle of attack of 20 to 45 ° with respect to the flow of the blown air. 3. The heat exchanger according to claim 1, wherein the vortex generation and cut-out portions are formed in a pair with the center of the heat transfer tube kept symmetrically at a certain distance. 4. The heat exchanger according to claim 1, wherein the adjacent vortex generation cut and raised portions are alternately cut and raised on the front and back of the flat plate fin surface. 5. The heat exchanger according to claim 1, wherein the surface of the flat fin is subjected to a hydrophilic treatment. 6. The heat exchanger according to claim 5, wherein the surface of the downstream air outflow area of the plate fin is subjected to a hydrophilic treatment.