JP2008116095A - Air heat exchanger - Google Patents

Abstract

Provided is a finned tube type air heat exchanger composed of a flat heat transfer tube that improves condensate discharge performance without increasing ventilation resistance, improves air-side heat transfer performance, and prevents water jumping. The purpose is to do.
A plurality of flat heat transfer tubes 2, 2 ... are arranged between headers 3A, 3B, and heat transfer fins 4, 4, ... are arranged between the plurality of flat heat transfer tubes 2, 2 .... In which the fin surfaces in the width direction are downward from above with respect to the flat heat transfer tubes 2, 2. It was assumed to be inclined.
In this way, drainage can be improved without reducing the heat transfer area of the heat transfer fins 4, 4... And without increasing the airflow resistance, leading to water splashing. Therefore, the heat transfer performance on the air side can be effectively improved.
[Selection] Figure 1

Description

  The invention of this application relates to a structure of an air heat exchanger configured to include a flat heat transfer tube and a heat transfer fin suitable for the flat heat transfer tube.

  For example, FIGS. 5 to 7 show the entire structure of the air heat exchanger including the flat heat transfer tubes and the heat transfer fins such as corrugated fins suitable for the flat heat transfer tubes and the structure of each part.

  For example, as shown in FIGS. 5 to 7, the air heat exchanger 1 is in a communication state between pipe-like refrigerant headers 3A and 3B into which refrigerant is introduced and led out, and the refrigerant headers 3A and 3B, and A plurality of flat heat transfer tubes 2, 2... Arranged in parallel with each other at a predetermined interval in the longitudinal direction, and a waveform in the vertical direction between the multiple flat heat transfer tubes 2, 2. Heat transfer fins (louver fins) 4, 4 arranged in a bent corrugation state and thermally welded to the flat heat transfer surfaces of the adjacent flat heat transfer tubes 2, 2. It consists of ...

As shown in FIG. 6, for example, the flat heat transfer tubes 2, 2... Have a flat porous tube structure having a plurality of refrigerant flow holes 2a, 2a. Side) The refrigerant introduced and distributed from the outside through the left refrigerant supply section 3A ₁ of the header 3A is caused to flow evenly through the refrigerant circulation holes 2a, 2a,. Through the heat transfer fins 4, 4..., Heat is exchanged between the internal refrigerant and the external air over a wide heat transfer area.

  Further, the refrigerant returned and distributed through the other side (lower side) header 3B flows evenly through the refrigerant circulation holes 2a, 2a,... Of the right four flat heat transfer tubes 2, 2,. In the above, heat exchange is efficiently performed between the internal refrigerant and the external air over a wide heat transfer area through the heat transfer fins 4, 4.

Then, the refrigerant that has left the right flat heat transfer tubes 2, 2... Flows out to the subsequent refrigerant circuit via the right refrigerant outlet 3 </ _b > A ₂ of the one side (upper side) header 3 </ _b > A. .

  In addition, the heat transfer fins 4, 4... Are flat flat portions excluding the wavy bent portions (folded portions), for example, as shown in FIG. A plurality of cut-and-raised pieces (louvers) 4a, 4a,... For improving heat transfer efficiency with air are formed at the upstream and downstream portions of the air flow as the center. The pieces 4a, 4a,... Are configured so that the heat exchange performance between the refrigerant and air is as high as possible (see, for example, Patent Documents 1 and 2).

  As described above, as shown in FIGS. 5 and 6, for example, the flat heat transfer tube 2 includes a flat heat transfer tube having a flat porous tube structure and a heat transfer fin having a corrugated structure. When 2 ... are installed in a vertical (vertical) state, the fin surfaces except for the bent portions of the heat transfer fins 4, 4 ... are horizontal, so the condensed water on the fin surface is difficult to drain and air It stagnates gradually from the upstream side to the downstream side of the flow, increasing the draft resistance.

  Therefore, when it is used as an evaporator, the pressure loss on the air side increases and the heat transfer performance falls, and further, the condensed water jumps out as water droplets from the trailing edge of the fin, so-called water splashing occurs. is there.

  Conventionally, as shown in FIG. 8, for example, as shown in FIG. 8, the entire longitudinal direction of the corrugated heat transfer fins 4, 4,... In order to discharge the condensed water to the windward side, thereby reducing the ventilation resistance due to the retention of the condensed water and preventing water jumping in the downstream air blowing direction (for example, Patent Document 3). reference).

Japanese Patent Laid-Open No. 2000-154989 (Specifications page 1-5, FIG. 1-3) Japanese Patent Laying-Open No. 2005-69529 (Specifications page 1-5, FIG. 1-2) Japanese Patent Laying-Open No. 2004-17704 (Specification 1-5, FIG. 1-2)

  However, in such a configuration, although the ventilation resistance due to the condensate water itself can be reduced, the entire fin surfaces of the heat transfer fins 4, 4,... On the contrary, there is a drawback that the ventilation resistance is increased and the pressure loss is further increased.

  The invention of this application was made to solve such a problem, and increases the ventilation resistance by arranging the fin surface in the width direction of the heat transfer fin to be inclined with respect to the flat heat transfer tube. An object of the present invention is to provide an air heat exchanger that improves the discharge performance of condensed water, improves the heat transfer performance on the air side, and prevents water jumping.

  In order to achieve the object, each invention of this application includes the following problem solving means.

(1) Invention of Claim 1 The air heat exchanger according to the present invention includes a plurality of flat heat transfer tubes 2, 2... Between the headers 3A, 3B, and the plurality of flat heat transfer tubes 2, 2,. .. is an air heat exchanger in which the heat transfer fins 4, 4... Are respectively arranged between the fins in the width direction of the flat heat transfer. It is characterized in that it is inclined downward from above with respect to the heat tubes 2, 2.

  According to such a configuration, it is possible to improve drainage without reducing the heat transfer area of the heat transfer fins 4, 4... And without increasing the ventilation resistance. Heat transfer performance can be improved effectively. In addition, it will not cause water splash.

(2) Invention of Claim 2 The air heat exchanger of this invention is the structure of the invention of Claim 1, wherein the heat transfer fins 4, 4,... Have flat fin heat transfer tubes 2, 2,. Between, it is the thing of the structure which has a single inclined surface over the whole, It is characterized by the above-mentioned.

  According to such a configuration, it is only necessary to incline the entire single flat fin surface in the width direction, so that special processing is not required, and the implementation is easy.

(3) Invention of Claim 3 The air heat exchanger of the present invention is the structure of the invention of Claim 1, wherein the heat transfer fins 4, 4,... Have flat fin heat transfer tubes 2, 2,. Between, it is the thing of the structure which has two inclined surfaces which incline on both sides from a predetermined position, It is characterized by the above-mentioned.

  According to such a structure, compared with the case where a single fin surface is inclined, the width | variety of a fin inclined surface becomes small to about 1/2 at the maximum, and condensed water can be approached to the flat heat exchanger tube side efficiently. Therefore, both water drainage performance and water splash prevention performance are improved.

(4) Invention of Claim 4 The air heat exchanger of this invention is the structure of the invention of the said Claim 1, 2, or 3, Heat transfer fin 4,4 ... is a waveform toward the longitudinal direction as a whole. It is characterized by being a corrugated fin bent in the shape of

  As the above-mentioned heat transfer fins 4, 4..., Various forms can be adopted, but the corrugated fin bent in a waveform in the longitudinal direction as described above has high heat transfer performance and is also installed. Since it is easy, it is suitable for the configuration of each invention described above.

  As a result of the above, according to the present invention, air heat exchange that improves the condensate discharge performance without increasing the airflow resistance of the fin portion, effectively improves the heat transfer performance on the air side, and also prevents water jumping. Can be provided at low cost.

  Hereinafter, some of the best embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
1 and 2 show the configuration of an air heat exchanger 1 according to the first preferred embodiment of the present invention.

  As shown in FIGS. 1 and 2, for example, the air heat exchanger 1 includes flat heat transfer tubes 2, 2... Made of flat porous tubes made of aluminum alloy as described above, and the flat heat transfer tubes 2, Are composed of heat transfer fins 4, 4... Of corrugation structure disposed in the longitudinal direction between the two flat heat transfer tubes 2, 2. Are formed in the outer periphery of the heat transfer fins 4, 4... It flows smoothly without any ventilation resistance while contacting the heat transfer fins 4, 4.

  In this case, the air heat exchanger 1 is used in a state where the flat heat transfer tubes 2, 2... Are arranged long in the vertical direction, and acts as an evaporator, for example. 1 and 2, the refrigerant headers disposed above and below the flat heat transfer tubes 2, 2... Are omitted.

  In the finned tube type air heat exchanger 1 having such flat heat transfer tubes 2, 2... And corrugation structure heat transfer fins 4, 4. When 2 ... are installed in the vertical direction, the fin surfaces excluding the bent portions of the heat transfer fins 4, 4 ... are horizontal as described above, so the heat transfer fins 4, 4 ... Condensed water on the surface is difficult to drain. Therefore, when the condensed water stays on the downstream side and is used as an evaporator, there is a problem in that the pressure loss on the air side increases and the performance deteriorates and water splashes occur.

  Therefore, in the air heat exchanger 1 of the best embodiment 1, in order to solve such a problem, for example, as shown in FIGS. 1 and 2, the heat transfer fins 4, 4,. · Is configured such that the fin surface in the width direction is inclined from the upper side to the lower side by a predetermined inclination angle θ with respect to the heat transfer surfaces of the flat heat transfer tubes 2, 2.

  That is, in this configuration, the fin surface line bb ′ is inclined from the one side to the other side by a desired angle θ with respect to the horizontal plane line aa ′ that is a conventional fin installation surface line in the width direction. It has become.

  And the flat heat transfer surface of the flat heat transfer tubes 2, 2... On the descending end side is located at a desired downstream position of the air flow A and on the fin surface in the bb ′ direction. Water guide grooves 2c, 2c,... Having desired depths are collected by the air flow A and finally flow in the drain pan direction.

  That is, according to such a configuration, the fin surfaces of the heat transfer fins 4, 4... Are inclined in the width direction, so that the condensed water is heated by the gravity of the condensed water on the fin surfaces. 4... Is brought close to the end (low end) of the fin surface of 4... And further, the fin surface is transmitted to the leeward side by the wind force of the air flow A, so the air flow downstream of the flat heat transfer tubes 2, 2. It is efficiently guided to the water guide grooves 2c, 2c... Provided at the desired front side, and further flows down in the drain pan direction through the water guide grooves 2c, 2c. Water drainage is improved and water splashing can be reliably suppressed.

  Moreover, the fin surfaces themselves of the heat transfer fins 4, 4... Are parallel to the direction in which the air flow A flows, and do not increase ventilation resistance and pressure loss as in the conventional example. Therefore, the drainage can be improved without reducing the heat transfer area of the heat transfer fins 4, 4... And without increasing the ventilation resistance, and the heat transfer performance on the air side is made effective. Can be improved.

  In that case, the heat transfer fins 4, 4... Have a single inclined surface over the entire surface between the flat heat transfer tubes 2. It has become.

  Therefore, according to such a configuration, it is only necessary to incline the entire single flat fin surface in the width direction, so that special processing is not required and the implementation is easy.

  Further, in the above configuration, the heat transfer fins 4, 4... Are constituted by corrugated fins (corrugated fins) bent in a waveform in the longitudinal direction as a whole.

  Of course, as the heat transfer fins 4, 4..., Various other forms can be used, but the corrugated fins bent in the waveform in the longitudinal direction as described above are as described above. This configuration is suitable for obtaining effective heat transfer performance.

  As a result, according to the air heat exchanger 1 of the best embodiment 1, the fin surface of the fin surface in the fin width direction of the flat heat transfer tubes 2, 2. Flat heat transfer tubes 2, 2... And corrugation structure heat transfer fins 4, 4... That have a simple and low-cost configuration that simply changes the installation angle .theta. It is possible to provide the finned tube type air heat exchanger provided.

<Best Embodiment 2>
FIG. 3 shows the configuration of an air heat exchanger according to the second preferred embodiment of the invention of this application.

  The basic configuration of the air heat exchanger 1 according to the best embodiment 2 is the same as that shown in FIGS. 1 and 2 described above.

  However, in the configuration of the air heat exchanger 1 according to the best embodiment 2, the heat transfer fins 4, 4... Of the corrugation structure described above have the fin surfaces of the flat heat transfer tubes 2, 2. In the meantime, for example, it has a mountain-shaped (convex) configuration having two inclined surfaces inclined in both the left and right sides from a predetermined position such as an intermediate portion.

  According to such a configuration, the width of the fin inclined surface in the descending direction is about ½ at maximum as compared with the case where the single fin surface is inclined in one direction as in the first embodiment. Since the condensate can be efficiently brought to the flat heat transfer tube side, the condensate drainage performance is further improved. As a result, water splash is less likely to occur.

<Third Embodiment>
The flat heat transfer tubes 2, 2... Made of the above flat porous tubes are not limited to the integral type as described above. For example, two aluminum heat transfer thin plates 21, as shown in FIG. The aluminum partition plate 23 having a corrugation structure is interposed between the two, and the both ends are caulked and welded and sealed to realize a flat porous tube structure similar to the above. Good.

It is a side view which shows the structure of the finned tube type air heat exchanger provided with the heat exchanger fin of the flat heat exchanger tube and corrugation structure which concerns on the best Embodiment 1 of this invention. It is a perspective view which shows the structure of the principal part of the same heat exchanger. It is a side view which shows the structure of the finned tube type air heat exchanger provided with the flat heat exchanger tube which concerns on best Embodiment 2 of this invention, and the heat-transfer fin of a corrugation structure. It is sectional drawing which shows the structure of the flat heat exchanger tube which concerns on best Embodiment 3 of this invention. It is a perspective view which shows the whole structure of the conventional air heat exchanger provided with the flat heat exchanger tube and the corrugated fin. It is a perspective view which shows the structure of the corrugated fin of the same air heat exchanger. It is a longitudinal cross-sectional view of the flat heat exchanger tube and the corrugated fin part of the air heat exchanger. It is a perspective view which shows the structure of the fin tube type air heat exchanger provided with the heat-transfer fin of the flat heat exchanger tube and corrugation structure concerning another prior art example.

Explanation of symbols

  1 is a heat exchanger, 2 is a flat heat transfer tube, 2c is a water guide groove in the direction of the lower drain pan, 3A is an upper header, 3B is a lower header, 4 is a heat transfer fin of a corrugation structure, 4a is a raised piece (Louver).

Claims (4)

  The plurality of flat heat transfer tubes (2), (2)... Are transferred between the headers (3A), (3B), and the plurality of flat heat transfer tubes (2), (2). It is an air heat exchanger in which heat fins (4), (4)... Are arranged, and the heat transfer fins (4), (4). An air heat exchanger which is inclined downward from above with respect to the flat heat transfer tubes (2), (2).   The heat transfer fins (4), (4)... Have a single inclined surface over the entire surface between the flat heat transfer tubes (2), (2). The air heat exchanger according to claim 1, wherein the air heat exchanger is one.   The heat transfer fins (4), (4)... Have two inclined surfaces whose fin surfaces are inclined to both sides from a predetermined position between the flat heat transfer tubes (2), (2). The air heat exchanger according to claim 1, wherein the air heat exchanger is configured.   The air heat exchanger according to claim 1, 2 or 3, wherein the heat transfer fins (4), (4) ... are corrugated fins bent in a waveform in the longitudinal direction as a whole.

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